1.
Schematic of LDH-W/PFDTMS composite coating on Mg alloy surface.
Hong-liang Li, Wen-nan Xu, Fei-fei Jia, Jian-bo Li, Shao-xian Song, and Yuri Nahmad, Correlation between surface charge and hydration on mineral surfaces in aqueous solutions: A critical review, Int. J. Miner. Metall. Mater., 27(2020), No. 7, pp.857-871. https://dx.doi.org/10.1007/s12613-020-2078-0
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Surface charges and hydration are predominant properties of colloidal particles that govern colloidal stability in aqueous suspensions. These properties usually coexist and interact with each other. The correlation between the surface charge and hydration of minerals is summarized on the basis of innovative experimental, theoretical, and molecular dynamics simulation studies. The factors affecting the adsorption behavior of ions and water molecules, such as ion concentration, ion hydration radius and valence, and surface properties, are discussed. For example, the hydration and adsorption states completely differ between monovalent and divalent ions. For ions of the same valence, the effect of surface charge on the hydration force follows the Hofmeister adsorption series. Electrolyte concentration exerts a significant effect on the hydration force at high ion concentrations. Meanwhile, the ion correlations in high-concentration electrolyte systems become long range. The interfacial water structure largely depends on surface chemistry. The hydration layer between different surfaces shows large qualitative differences.
Mg alloys are notable for their excellent physicochemical properties, making them popular in various industries, including automotive [1–2], aerospace [3–5], electronics [6–7], and biomedical [1–3]. Despite their advantages, their low corrosion potentials (−1.5 V vs. SHE (standard hydrogen electrode)) render them highly susceptible to corrosion, limiting their wider application. Designing suitable surface coatings is an effective way to suppress corrosion. Common surface treatments for Mg alloys mainly include chemical conversion films [4–8], metal plating [9–11], micro-arc oxidation [12–17], and organic coatings [18–20]. Among these, layered double hydroxides (LDHs) have attracted much attention recently owing to their environmental friendliness, low cost, and simple preparation process, positioning them as potential alternatives to traditional, carcinogenic chromate coatings. However, LDH layers inherently contain micro/nanopores that can act as diffusion channels for aqueous corrosive agents, thereby requiring appropriate post-treatment to enhance corrosion resistance. A typical method involves the deposition of additional layers onto the LDH surface to fill and seal these pores. For example, Ni–P alloys have been used to fill the porous structure of the LDH film, while organic layers have been applied to cover the microdefects on the LDH surface [21–22].
Superhydrophobic surfaces offer an effective method for improving corrosion protection through their outstanding self-cleaning and water-repellency capabilities, which prolong the penetration of corrosive media to the metal substrate [23–24]. Typical superhydrophobic coatings exhibit micro/nanorough structures with a low surface energy [25]. Although numerous methods for preparing such coatings have been reported, most emphasize the micro/nanorough structure and low surface energy. For example, composite coatings prepared by spraying SiO2-modified polydimethylsiloxane on the microarc oxidized coating have demonstrated sustained superhydrophobicity in acid, alkali, high/low temperature, and UV radiation exposure, leading to impressive corrosion resistance in neutral solutions [26]. Another approach involved the development of dodecyltrimethoxysilane-modified Mg(OH)2 superhydrophobic coating through electrodeposition, reaching a contact angle of (165.1 ± 2.1)° and decreasing the corrosion current density by three orders of magnitude compared to that of the uncoated AZ31 Mg alloy [27]. The LDH film comprises many perpendicularly grown nanosheets and exhibits a micro/nanoscale rough structure. The post-treatment process for pore closure should mainly focus on imparting low surface energy to the coating. Silanization is a low-cost and effective method for achieving low surface energies in coatings. During this process, silanol groups (Si–OH) generated by the hydrolysis of fluorosilanes condense with hydroxyl groups (metal–OH) on the metal surface, leading to the formation of Me–O–Si bonds. Meanwhile, dehydration polymerization between Si–OH generates Si–O–Si bonds, forming chemically stable and corrosion-resistant polysiloxane films [28]. The LDH coating, rich in hydroxyl groups (–OH), benefits from the condensation reaction facilitated by silane treatment on its surface, promoting the development of superhydrophobic coating with strong adhesion [29].
Most of the existing literature on preparing corrosion-resistant LDH films on Mg alloys uses hydrothermal methods that require high temperatures and pressures. In this study, we first developed a tungstate-intercalated MgAl–LDH film on the surface of Mg alloy with the assistance of a chelator under relatively mild conditions. This was followed by a modification of the LDH phase using perfluorodecyltrimethoxysilane (PFDTMS) as low-surface-energy substance to produce LDH-W/PFDTMS composite coating. The successful incorporation of PFDTMS into the LDH layer was confirmed by characterizing the composite coating’s surface morphology, composition, and structure. Electrochemical measurements, immersion experiments, and contact angle tests showed that the LDH-based coatings, modified by the siloxane film, greatly improved the corrosion resistance of the Mg alloy and exhibited superior superhydrophobicity and self-cleaning capabilities.
The composition of the AZ31 Mg alloy sheet (30 mm × 20 mm × 2.0 mm) includes 2.75wt% Al, 1.15wt% Zn, 0.16wt% Mn, and the remainder Mg. The chemical reagents, including ethylenediaminetetraacetic acid (EDTA,98%), sodium hydroxide (NaOH, 98%), sodium chloride (NaCl, >99%), sodium tungstate (Na2WO4, 98%), sodium nitrate (NaNO3, AR), and 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane (PFDTMS, ≥97%) were purchased from Aladdin Industrial Corporation. Deionized water with resistance of 18.2 MΩ·cm at 25°C was prepared using water purification system (UPT-II-10T)
The aqueous solution containing the chelating agent EDTA (0.1 mol/L) and sodium nitrate (0.25 mol/L) was prepared. The pH value of the solution was adjusted to (10.0 ± 0.1) using NaOH solution (0.5 mol/L). Under continuous stirring, a polished AZ31 specimen was immersed into the solution (200 mL) and reacted for 12 h at (95 ± 1)°C.
The pH of Na2WO4 (0.1 mol/L) solution was adjusted to (10.0 ± 0.1) using 0.1 mol/L NaOH aqueous solution. Under continuous stirring, the LDH-coated Mg alloy was immersed into the inhibitor solution for an ion-exchange reaction for 4 h at 95°C. After the anion exchange treatment, the sample was washed with deionized water, dried in air, and named LDH-W.
The LDH-W samples were immersed in 50:50 (V/V) mixture of CH3CH2OH and H2O containing PFDTMS (0.1 M) for modification at ambient temperature and atmospheric pressure for 12, 18, 24, and 30 h, respectively. The modified samples were washed thoroughly with ethanol and deionized water and dried in an oven at 60°C for 2 h. The resulting samples were labeled LDH-W/PFDTMS-x (x = 12, 18, 24, and 30 h). According to Scheme 1, the preparation of the LDH coating occurred at relatively low temperature under atmospheric pressure. This led to the incomplete transformation of the Mg(OH)2 phase on the surface of the Mg alloy into the LDH phase, resulting in the formation of thin Mg(OH)2 film underneath the LDH layer.
Scanning electron microscope (SEM, Hitachi SU8020) was used to observe the surface morphology and microstructure of the LDH-W and LDH-W/PFDTMS coatings. The elemental composition of the coatings was characterized by energy dispersive spectroscopy (EDS). The functional groups on the coating surface were analyzed using Fourier transform infrared spectroscopy (FTIR, Nicolet-6700, USA, wavenumber range: 500–4000 cm−1). The crystallographic features of both LDH and LDH-W coatings were characterized using X-ray diffraction (XRD, D8 ADVANCE, Germany), with the measurements carried out at a scanning speed of 5°·min−1 in the 5°–80° range at voltage of 40 kV and current of 30 mA. The compositions of the LDH-W and LDH-W/PFDTMS coatings were also determined by X-ray photoelectron spectroscopy (XPS, 250Xi, Thermo-escalab, Waltham, MA, USA). The acquired XPS data were analyzed using XPS peak software. The coatings’ surface roughness (Ra) values were measured using a 3D profilometer (Contour GT-X, Germany). Their static contact angles (CAs) were recorded using an optical contact angle meter (SL200KS, KINO, USA) at 25°C with a droplet volume of 5.0 μL. These measurements were performed by determining and averaging the water CA values at five different points on the coating surface to ensure reproducibility.
The electrochemical impedance spectroscopy (EIS) and Tafel curves of the samples were obtained by electrochemical workstation (Gamry, USA) to assess the corrosion resistance. A custom-designed set-up featuring a three-electrode system was used for the electrochemical test. The samples (Mg alloy, LDH-W, or LDH-W/PFDTMS-x coating) with exposed area of 1.0 cm2 served as the working electrode, with a platinum (Pt) sheet and a saturated calomel electrode (SCE) acting as the counter and reference electrodes, respectively. To shield against external electromagnetic interference, the three-electrode system was placed within a Faraday cage. Before collecting EIS and Tafel data, the system was immersed in a corrosive solution for over 20 min until the open circuit potential (OCP) was stabilized. EIS measurements were performed in the frequency range of 105–10−2 Hz with a perturbation potential of 5.0 mV. The EIS data was fitted using different equivalent circuit diagram (EC) models through Gamry Analyst software. The Tafel curves were obtained in the potential range of −300–300 mV (vs. OCP) at a scanning rate of 1.0 mV·s−1. All electrochemical experiments were repeated at least three times.
The surface morphologies of the LDH-W films before and after PFDTMS modification are shown in Fig. 1. A noticeable change in the surface morphology of the LDH film before and after modification is not observed (Fig. 1(a)–(c) and (e)–(g)). Both LDH coatings display a typical LDH nanosheet structure, indicating that the siloxane modification does not change the surface structure. After analyzing the chemical compositions of the LDH-W and LDH-W/PFDTMS coating surfaces (Fig. 1(c) and (f)), only Mg, Al, O, C, N, and W elements are detected on the surface of the LDH-W coating. By contrast, in addition to these elements in the LDH-W film, abundant F and Si elements are identified on the LDH-W/PFDTMS coating surface after PFDTMS modification. The contents of the Mg and Al elements on the surface of the LDH-W/PFDTMS coating are significantly reduced, while the content of the C element is significantly increased from 5.52wt% to 26.4wt% (Table 1). This elemental change preliminarily indicates the successful generation of polysiloxane film on the LDH-W layer surface.
| Samples | Mg | Al | C | O | N | W | F | Si |
| LDH-W | 23.87 | 8.53 | 5.52 | 48.02 | 0.67 | 13.38 | — | — |
| LDH-W/ PFDTMS |
10.80 | 3.60 | 26.40 | 23.80 | 0.20 | 1.20 | 29.5 | 4.4 |
The XRD patterns of the LDH and LDH-W films grown on Mg alloys are shown in Fig. 2(a). They highlight the characteristic diffraction peaks of the (006) and (003) crystal planes of the LDH phase without inhibitor, located at diffraction angles (2θ) of 23.3° and 11.6°, respectively. This pattern suggests that the interlayer anions of the LDH film prepared using EDTA solution are CO2−3 or NO−3[30]. After treatment with an inhibitor (resulting in LDH-W), these characteristic diffraction peaks shifted to 22.7° and 11.2°, respectively [31]. This shift is attributed to a slight increase in the interlamellar distance as a consequence of the inhibitor anions being intercalated into the LDH interlayers [32]. The FTIR spectra of the LDH-W composite coatings before and after the PFDTMS modification are presented in Fig. 2(b). The FTIR spectra show that the chemical groups in the LDH-W coating mainly include hydroxyl groups (–OH) (3520 and 1650 cm−1) [33–34], C–O (1430 and 1010 cm−1), and W–O–W (858 cm−1) [35]. Two additional absorption peaks appear at 1150 and 1210 cm−1 in the FTIR spectra of the LDH-W/PFDTMS coating, attributed to the Si–O and C–F bonds [29]. The results confirm the successful formation of polysiloxane on the LDH-W film surface.
The composition and elemental chemical state at the surface of the LDH-W and LDH-W/PFDTMS coatings were determined using XPS. For the LDH-W film, the C 1s profile consists mainly of two peaks located at 284.9 and 288.3 eV (Fig. 3(a)), which are attributed to the contaminated carbon and O=C–O bond from the CO2−3 in the LDH phase, respectively [29]. Following PFDTMS modification, the LDH-W/PFDTMS coating surface mainly contains C, F, O, and Si. The C 1s spectrum was deconvoluted into four peaks, including two characteristic peaks (C–C and C=O–C) associated with the LDH-W phase and two characteristic peaks of 291.3 and 293.4 eV, corresponding to –CF2– and –CF3, respectively [36]. These findings further confirm the existence of polysiloxane film in the LDH phase. This conclusion is further supported by the high-resolution XPS spectra of the O 1s, F 1s, and Si 2p. The three fitted peaks in the O 1s spectrum of the LDH-W coating correspond to W–O (530.2 eV), M–OH (531.5 eV), and intercalated H2O molecules (532.3 eV) (Fig. 3(b)) [37–39]. In addition, a characteristic peak of the Si–O bond is observed at 532.9 eV in the high-resolution XPS spectra of the PFDTMS-modified sample [40]. The F 1s and Si 2p high-resolution XPS spectra of the LDH-W/PFDTMS coating exhibit obvious characteristic peaks originating from the F–C (687.7 eV) and Si–O (102.7 eV) bonds, respectively (Fig. 3(c) and (d)) [41–42]. Typically, the average depth of XPS analysis is less than 10 nm, allowing for the detection of chemical elements in the underlying LDH layer unless the top layer is very thin. Conversely, if the surface layer is too thick, detecting elements in the bottom layer becomes challenging. This suggests that the thickness of the formed polysiloxane film is likely only a few nanometers.
The cross-sectional SEM image and EDS maps of the LDH-W/PFDTMS composite coating are presented in Fig. 4. This cross-sectional view reveals four distinct regions from top to bottom, corresponding to the polysiloxane, LDH, Mg(OH)2 films, and the magnesium alloy substrate, respectively. The polysiloxane film mainly comprises C, F, and Si elements, while the Mg(OH)2 film consists of Mg and O elements. In addition to the two elements, the LDH film comprises Al, C, W, and Si elements. Based on the cross-sectional SEM image and the distribution of Mg in the bottom region, the total thickness of the composite coating is estimated to be approximately 34.5 μm. The presence of Al in the LDH phase, but not in the Mg(OH)2 layer, allows for the differentiation between the thicknesses of the LDH and Mg(OH)2 layers, measured at 23.2 and 11.3 μm, respectively. The detection of a small amount of Al outside the Mg(OH)2 layer is attributed to the diffusion of different elements during sample preparation. The latter involved a mechanical polishing machine with running water. Similar diffusion phenomena are observed for the W, F, and Si elements.
Wettability significantly affects the corrosion resistance of coatings on Mg alloy surfaces. Fig. 5 illustrates the changes in water CA (WCA) values for LDH-W-based coatings immersed in PFDTMS solution over different durations. The WCA value of the untreated LDH-W coating is only (13.3 ± 0.3)°, indicating a hydrophilic state owing to the large number of hydrophilic –OH groups in the LDH phase. All PFDTMS-modified LDH-W samples exhibit superhydrophobicity. The WCA values of the LDH-W coatings after immersion in PFDTMS solution for 12 and 18 h are (150.5 ± 2.2)° and (155.6 ± 1.6)°, respectively. This significant increase in WCA indicates the shift from hydrophilicity to superhydrophobicity on the surface of the LDH-W coating following PFDTMS treatment. Extending the immersion time to 24 h allows for sufficient reaction between the silanol in the siloxane with the hydroxyl groups on the LDH film surface, resulting in a remarkable increase in WCA to (162.2 ± 1.7)°. Further increasing the immersion time to 30 h causes the WCA value of the composite coating to decrease to (156.8 ± 2.4)° (Fig. 5(e)). The slight decrease in WCA may attributed to the formation of an excess amount of polysiloxane film, which, in turn, reduces the surface roughness [43]. Therefore, a 24-h immersion period is identified as the optimal duration for PFDTMS treatment of LDH-W coatings.
The Wenzel model can explain the lower WCA values of the LDH-W coating compared to the bare Mg alloy (46.2 ± 2.2)° [26,44–45]. According to the Wenzel equation:
| cosθ1=r cosθ | (1) |
where θ is the intrinsic CA on an ideally smooth surface, r is the roughness factor, and θ1 denotes the apparent CA on a rough surface, equivalent to the static CA values measured. When θ > 90° (indicating hydrophobic surface), θ1 increases with increasing r, suggesting that the rougher the solid surface, the more hydrophobic it becomes. Conversely, when θ < 90° (signifying hydrophilic surface), θ1 decreases with increasing r, meaning that the rougher the solid surface, the more hydrophilic it appears [46]. The bare Mg alloy surface is prone to oxidization, leading to the formation of a corrosive film enriched with hydroxyl groups, thereby presenting a hydrophilic state. Similarly, the LDH-W film is abundant in hydroxyl groups and exhibits hydrophilicity. Moreover, its surface roughness significantly exceeds that of the bare Mg alloy, resulting in enhanced hydrophilicity as reflected by smaller WCA of (13.3 ± 0.3)°. This increased hydrophilicity allows water and corrosive media to fully saturate the entire surface of the LDH film and fill these gaps among the nanosheets. Consequently, this wettability accelerates the penetration of aqueous corrosive media through the micro and nanopores into the LDH, reaching the Mg alloy substrate beneath, which negatively affects corrosion protection.
The polysiloxane film formed on the LDH-W surface contains hydrophobic groups such as –CF2–, –CF3, and –CH2– groups after PFDTMS treatment, which reduces the surface free energy and repels –OH groups. This transformation shifts the surface from hydrophilic to hydrophobic. Consequently, the nanosheets and air trapped among the LDH-W nanosheets act as a cushion, preventing the aqueous corrosive solution from fully impregnating the surface, thereby reducing the corrosion rate. The polysiloxane content increases as modification time rises, enhancing hydrophobicity and achieving the highest WCA value of (162.2 ± 1.7)°. The Cassie–Baxter model elucidates the decline in the WCA value of the composite coating with excess modification time. According to the Cassie–Baxter equation:
| cosθCB=f(cosθ+1)−1 | (2) |
where θCB represents the apparent CA on the solid surface (i.e., the measured static CA), and f is the contact fraction at the solid–liquid interface. The θCB increases as the f decreases until approaching 180° when the latter approaches 0 [47–48]. A long modification time causes the formation of an excessively thick polysiloxane film on the LDH-W surface, which increases the contact fraction f of the solid–liquid interface, which, in turn, lowers the θCB value [28]. This decreased hydrophobicity adversely affects the coating’s corrosion resistance. Hereafter, LDH-W/PFDTMS denotes the LDH-W layer treated with PFDTMS for 24 h.
The wettability result of several common liquids, including NaCl solution, cola, milk, coffee, and tea drops, on the LDH-W/PFDTMS surface, are shown in Fig. 6. All liquid drops form near-spherical shapes on the composite coating surface, with CAs exceeding 150°. These results demonstrate the LDH-W/PFDTMS coating’s excellent ability to repel commonly encountered liquids. In particular, the CA value reaches 160.9° for a corrosive solution containing Cl−.
The self-cleaning capabilities were evaluated by placing the LDH-W and LDH-W/PFDTMS coatings in Petri dishes at angles of less than 10° to the horizontal plane. Graphite powder was used as a contaminant, randomly scattered on the coating surfaces, followed by rinsing with water droplets. For the LDH-W coating, water droplets contacted the surface and then immediately spread out and wetted the coating surface (Fig. 7(a) and (b)). The surface became completely wet as more water drops fell. After rinsing, most of the graphite powder was removed with the water droplets under the force of gravity, leaving only a small portion on the surface, which then accumulated at the lower edge of the sample. By contrast, the water droplets on the surface of the LDH-W/PFDTMS coating demonstrated different behavior (Fig. 7(d) and (e)). Water droplets remained spherical and flowed rapidly along the inclined surface toward the Petri dish, carrying the graphite powder quickly into the dish. After rinsing, the sample surface remained dry and clean, with no visible residual graphite powder. A water-repellency test further verified the superior hydrophobicity and lower water adhesion of the LDH-W/PFDTMS composite coating compared to the LDH-W coating. The sample was horizontally fixed using an electrode clamp, and a needle was used to spray water column onto the sample surface. The water immediately spread on the surface of the LDH-W coating when the water column contacted the surface (Fig. 7(c)), manifesting strong hydrophilicity. By contrast, the water column was instantly ejected away from the surface of the LDH-W/PFDTMS coating (Fig. 7(f)), with no water stains or droplet spreading observed, demonstrating its exceptional water-repellency ability.
The roughness of the LDH-W coating surface before and after PFDTMS treatment was assessed using three-dimensional profilometer (Fig. 8(a) and (b)). Both coatings presented similar micro/nanosized peaks and comparable roughness (Ra) levels, indicating negligible changes in the surface microstructure of the coating after being modified by PFDTMS, consistent with the SEM image result. The exceptional superhydrophobic performance of the composite coating is attributed to its micro/nanoscale rough structure combined with low surface energy. The WCA value of the LDH-W/PFDTMS coating decreased evidently to (150.2 ± 1.9)° after 15 d of exposure to neutral corrosive solution but remained superhydrophobic. After four months of exposure to air, the WCA value decreases by only 2.7° to (159.5 ± 2.1)°, maintaining high hydrophobicity (Fig. 8(c) and (d)).
The effect of immersion time in PFDTMS solution on the EIS plots and Tafel curves of the LDH-W/PFDTMS-x coating, along with the fitted electrochemical parameters based on the EC model, is illustrated in Fig. 9 and Table 2. In general, a higher impedance modulus in the low-frequency region of the EIS spectrum indicates better corrosion resistance of the coating [49–50]. This varied corrosion resistance was also confirmed by the diameter of the capacitance arc in the Nyquist diagram (Fig. 9(c)), where larger diameter denotes enhanced corrosion resistance [51]. The LDH-W/PFDTMS-24 h coating exhibited exceptional corrosion resistance. The higher the corrosion potential (Ecorr) and the lower the corrosion current density (jcorr) in the Tafel curve, the better the corrosion resistance of the coating [52]. The low-frequency impedance modulus of the LDH-W/PFDTMS-x coating increases and then decreases with increasing immersion time (Fig. 9(a) and (d)). The impedance modulus value of the composite coating peaks at modification time of 24 h (up to 18 MΩ·cm2). The Ecorr of the sample shifts positively, and the jcorr gradually decreases as the reaction time increases from 12 to 24 h (Fig. 9(e) and (f) and Table 3). Extending the modification time further to 30 h results in a decrease in Ecorr and an increase in jcorr; the corrosion potential of the LDH-W/PFDTMS-24 h coating is −338 mV, and the corrosion current density is 1.86 × 10−9 A·cm–2. These electrochemical tests indicate the optimal corrosion resistance offered by the LDH-W/PFDTMS-24 h coating. The reduced corrosion resistance of the LDH-W coating with overly prolonged PFDTMS treatment may be attributed to a decrease in hydrophobicity, as previously discussed.
| LDH-W/ PFDTMS-x |
|Z|f=0.01 Hz / (Ω· cm2) |
Rs / (Ω· cm2) |
YPFDTMS / (10−9 S·sn· cm−2) |
RPFDTMS / (kΩ· cm2) |
YLDH / (10−9 S·sn· cm−2) |
RLDH / (kΩ· cm2) |
Yc / (10−9 S·sn· cm−2) |
Rc / (kΩ· cm2) |
ZW / (10−5 S·s0.5· cm−2) |
Ydl / (10−9 S·sn· cm−2) |
Rct / (kΩ· cm2) |
χ2 / 10−3 |
| 12 h | 1.22 × 106 | 4.6 | 8.97 | 503 | 8.99 | 3898 | 14.63 | 3012 | 5.6 | 9.84 | 875 | 5.4 |
| 18 h | 5.48 × 106 | 8.2 | 8.25 | 863 | 7.92 | 4020 | 13.40 | 3250 | 7.1 | 7.51 | 5100 | 2.4 |
| 24 h | 2.20 × 107 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.8 |
| 30 h | 6.40 × 106 | 6.8 | 6.59 | 1193 | 5.77 | 4640 | 10.21 | 3220 | 6.5 | 6.77 | 6150 | 4.9 |
| Samples (LDH-W/ PFDTMS-x) |
Ecorr / mV |
jcorr / (10–9 A·cm−2) | ßa / (mV·dec−1) | ̶ ßc / (mV·dec−1) |
| 12 h | −509 | 3.4 | 205 | 291 |
| 18 h | −452 | 2.03 | 265 | 325 |
| 24 h | −338 | 1.86 | 293 | 346 |
| 30 h | −376 | 1.96 | 284 | 339 |
Fig. 10 displays the EIS spectra and Tafel curves for Mg alloy, LDH-W, and LDH-W/PFDTMS coatings in 3.5wt% NaCl solution. The impedance modulus at a frequency of 0.01 Hz (|Z|f=0.01 Hz) for both coatings is significantly higher than that of the bare Mg alloy (Fig. 10(a)). The |Z|f=0.01 Hz values for LDH-W and LDH-W/PFDTMS coatings are 8.64 × 104 and 2.20 × 107 Ω·cm2, respectively, which are two and five orders of magnitude higher than that of the bare Mg alloy (2.18 × 102 Ω·cm2). Bode phase angle plots corresponding to the different coatings are shown in Fig. 10(b), where the phase angle for the LDH-W/PFDTMS coating at a frequency of 105 Hz is approximately −80°. By contrast, these values for the bare Mg alloy and the LDH-W coating are close to 0°, confirming the superior corrosion resistance of the LDH-W/PFDTMS coating. The electrochemical parameters obtained by fitting the experimental data using an EC model (Fig. 10(e)–(g)) are listed in Table 4. The EC model’s electrochemical components include Rs, representing the solution resistance, L and RL, denoting the inductance and resistance associated with the relaxation process induced by corrosion products on the Mg alloy surface [53]; YLDH and RLDH represent the constant phase element (CPE) and resistance of the LDH-W coating, respectively; Yc and Rc represent the CPE and resistance of the inner Mg(OH)2 layer, respectively; Ydl and Rct represent the electric double layer’s CPE and charge transfer resistance, respectively, while the ZW represents the Warburg diffusion resistance [54]; RPFDTMS and YPFDTMS, as shown in Fig. 10(f), represent the resistance and CPE of the PFDTMS layer, respectively. The Rct value of the bare Mg alloy is only 125 Ω·cm2, which increased by 319 times to 39.9 kΩ·cm2 for the LDH-W coating and by 14.4 × 104 times to 18.0 MΩ·cm2 for the LDH-W/PFDTMS coating (Table 4). This indicates a significant enhancement in the corrosion protection of the PFDTMS-modified composite coating compared to the pure LDH-W coating.
| Samples | |Z|f=0.01 Hz / (Ω· cm2) |
Rs / (Ω· cm2) |
YPFDTMS / (10−9 S·sn· cm−2) |
RPFDTMS / (kΩ· cm2) |
YLDH / (10−9 S·sn· cm−2) |
RLDH / (kΩ· cm2) |
Yc / (10−9 S·sn· cm−2) |
Rc / (kΩ· cm2) |
ZW / (10−5 S·s0.5· cm−2) |
Ydl / (10−9 S·sn· cm−2) |
Rct / (kΩ· cm2) |
χ2 / 10−3 |
| Mg alloy | 2.18 × 102 | 24.5 | — | — | — | — | — | — | — | 380400 | 0.125 | 7.5 |
| LDH-W | 8.64 × 104 | 40.1 | — | — | 5820 | 5.50 | 4950 | 4.30 | 9.82 | 142500 | 39.9 | 2.40 |
| LDH-W/ PFDTMS |
2.20 × 107 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.8 |
Fig. 10(c) shows the Tafel curves of Mg alloy, LDH-W, and LDH-W/PFDTMS coatings in 3.5wt% NaCl solution. The corresponding Ecorr and jcorr for the Mg alloy and the different coatings are listed in Table 5. The jcorr of LDH-W and LDH-W/PFDTMS coatings are significantly lower, while the Ecorr are notably higher than those of the bare Mg alloy. The Ecorr for the Mg alloy is −1410 mV; it improves to −400 mV for the LDH-W coating and is positively shifted to −338 mV for the LDH-W/PFDTMS coating. The jcorr is 6.0 × 10−5 A·cm−2 for the Mg alloy and decreases by two orders of magnitude to 3.03 × 10−7 A·cm−2 for the LDH-W coating. Following PFDTMS treatment, the jcorr of the LDH-W/PFDTMS coating decreases to 1.86 × 10−9 A·cm−2, which is four and two orders of magnitude lower than that of Mg alloy and LDH-W coating, respectively. The LDH-W/PFDTMS coating exhibits the lowest jcorr and the most positive Ecorr, demonstrating the outstanding corrosion protection of the developed superhydrophobic composite coating, which is consistent with the EIS findings. Compared with the LDH-W coating, the LDH-W/PFDTMS contains only a nanometer-thick polysiloxane film, indicating that the improvement in corrosion resistance is mainly attributed to its high superhydrophobicity and water repellency.
| Samples | Ecorr / mV | jcorr / (A·cm−2) | ̶ ßc / (mV·dec−1) |
| Mg alloy | −1410 | 6.0 × 10−5 | 87 |
| LDH-W | −400 | 3.03 × 10−7 | 213 |
| LDH-W/PFDTMS | −338 | 1.86 × 10−9 | 340 |
The corrosion resistance of the coatings was also evaluated by salt spray test. Fig. 11 displays the optical images of the LDH, LDH-W, and LDH-W/PFDTMS coatings after exposure to a salt spray environment at different times. Several obvious corrosion cavities appear at the surface of the LDH coating after just 1 d of exposure. By contrast, small visual corrosion pits begin to form on the surface of the LDH-W coating after 10 d of exposure, with the diameters of these pits becoming larger as exposure time increases. The higher concentration of NaCl solution and elevated temperatures used in the salt spray test accelerate the corrosion rate of the LDH-W coating in the salt spray environment, compared to the immersion test. Compared with the LDH and LDH-W coatings, the superhydrophobic LDH-W/PFDTMS coating shows no visible corrosion pits even after 16 d of salt spray exposure, demonstrating its significantly enhanced corrosion protection of the composite coating for the Mg alloy.
Fig. 12 shows the EIS spectra of LDH-W and LDH-W/PFDTMS coatings after being immersed in neutral aqueous solution for different durations to investigate their long-lasting protective capabilities. The fitted parameters by the EC model are listed in Table 6. During immersion, the two coatings’ |Z|f=0.01 Hz values decreased as the immersion time increased. After 15 d of immersion, the Rct of the LDH-W coating decreased slightly by 3.65 kΩ·cm2 from the initial 39.9 to 36.25 kΩ·cm2, indicating the stable long-term corrosion resistance of the LDH-W coating, as shown in Fig. 12(a). Conversely, the Rct of the LDH-W/PFDTMS coating decreased evidently from the initial 18.0 to 12.5 MΩ·cm2 (Fig. 12(c)). Nonetheless, the Rct of the composite coating remained significantly high, approximately 345 times that of the LDH-W coating after 15 d of exposure and much higher than that of the newly prepared LDH-W coating. In addition, the phase angles of the LDH-W/PFDTMS coatings at high frequencies are maintained at approximately −80° (Fig. 12(b) and (d)), confirming the coating’s excellent long-term corrosion protection of Mg alloy. The changes in the surface microstructure of the LDH-W/PFDTMS coating after 15 d of immersion were observed using SEM (Fig. 13). The SEM images reveal that the surface morphology of the LDH-W/PFDTMS sample did not change evidently, and the typical nanosheet structure of the LDH was still maintained after 15 d of immersion. These findings underscore the exceptional chemical stability of the superhydrophobic coating.
| Samples | Immersion time / d | Rs / (Ω· cm2) | YPFDTMS / (10−9 S·sn· cm−2) | RPFDTMS / (kΩ· cm2) | YLDH / (10−9 S·sn· cm−2) | RLDH / (kΩ· cm2) | Yc / (10−9 S·sn· cm−2) | Rc / (kΩ· cm2) | ZW / (10−5 S·s0.5· cm−2) | Ydl / (10−9 S·sn· cm−2) | Rct / (kΩ· cm2) | χ2 / 10−3 |
| LDH-W | 0 | 40.1 | — | — | 5820 | 5.50 | 4950 | 4.30 | 9.82 | 142500 | 39.9 | 2.40 |
| 1 | 44.8 | — | — | 5810 | 2.98 | 5350 | 3.76 | 8.02 | 151300 | 38.87 | 3.36 | |
| 3 | 45.2 | — | — | 5700 | 3.21 | 5780 | 3.21 | 6.62 | 15500 | 38.28 | 1.45 | |
| 5 | 43.6 | — | — | 6960 | 2.4 | 5860 | 3.01 | 6.82 | 154500 | 37.57 | 1.49 | |
| 7 | 45.7 | — | — | 5540 | 3.68 | 5140 | 3.85 | 12.17 | 135300 | 37.08 | 1.72 | |
| 15 | 42.3 | — | — | 5865 | 3.58 | 5320 | 3.53 | 11.83 | 133500 | 36.25 | 2.78 | |
| LDH-W/ PFDTMS | 0 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.80 |
| 1 | 3 | 5.77 | 3660 | 3.59 | 5670 | 9.84 | 3437 | 8.64 | 6.74 | 17500 | 1.93 | |
| 3 | 1.8 | 5.96 | 3480 | 3.82 | 5570 | 9.92 | 3397 | 7.86 | 6.98 | 15890 | 1.22 | |
| 5 | 2.8 | 6.16 | 3371 | 3.91 | 5452 | 9.96 | 3280 | 7.55 | 8.78 | 13870 | 5.10 | |
| 7 | 1.5 | 5.93 | 3301 | 3.87 | 5490 | 9.95 | 3359 | 6.94 | 10.65 | 14620 | 1.37 | |
| 15 | 2.3 | 6.61 | 3008 | 4.11 | 5100 | 9.99 | 3256 | 6.24 | 12.33 | 12540 | 1.89 |
The superior corrosion protection capability of LDH-W/PFDTMS composite coatings mainly stems from the water repellency of the superhydrophobic surface, the physical barrier effect, the entrapment of corrosive ions, and the corrosion inhibition owing to the release of inhibitors from the LDH-W layer. The corrosion protection of the LDH-W coating is mainly attributed to the physical barrier properties and ability to capture corrosive anions (such as Cl−) and release corrosion inhibitors through ion exchange function. Compared with the pure LDH-W coating, the water repellency provided by the uppermost polysiloxane layer, which has low surface energy in the LDH-W/PFDTMS coating, is crucial for improving corrosion resistance. The aqueous corrosive medium cannot fully impregnate the PFDTMS-modified LDH-W nanosheets. These micro- and nanoscale gaps among the LDH-W nanosheets can trap air, forming an “air cushion” that reduces the contact area between the corrosive medium and the film. This decreased contact area impedes the infiltration of the corrosive medium into the substrate, greatly improving the corrosion resistance of the composite coating.
The superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating consisting of tungstate-intercalated LDH primer and polysiloxane top layer was successfully prepared on the surface of Mg alloy at low temperatures and under atmospheric pressure. The composite coating exhibited remarkable superhydrophobicity, self-cleaning capabilities against several common aqueous beverages, and outstanding long-lasting corrosion resistance in neutral solutions for the Mg alloy. The superior corrosion protection of the composite coating can be attributed to the water repellency of the PFDTMS outer layer and the physical barrier it creates, its ability to trap corrosive anions such as chloride, and the corrosion inhibition provided by the inhibitors released by the anion exchange process of the LDH phase. These results demonstrated that constructing superhydrophobic and corrosion-resistant LDH-based composite coatings under mild reaction conditions is feasible and beneficial for the large-scale industrial application of LDH coatings in surface treatments for Mg alloys.
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| Samples | Mg | Al | C | O | N | W | F | Si |
| LDH-W | 23.87 | 8.53 | 5.52 | 48.02 | 0.67 | 13.38 | — | — |
| LDH-W/ PFDTMS |
10.80 | 3.60 | 26.40 | 23.80 | 0.20 | 1.20 | 29.5 | 4.4 |
| LDH-W/ PFDTMS-x |
|Z|f=0.01 Hz / (Ω· cm2) |
Rs / (Ω· cm2) |
YPFDTMS / (10−9 S·sn· cm−2) |
RPFDTMS / (kΩ· cm2) |
YLDH / (10−9 S·sn· cm−2) |
RLDH / (kΩ· cm2) |
Yc / (10−9 S·sn· cm−2) |
Rc / (kΩ· cm2) |
ZW / (10−5 S·s0.5· cm−2) |
Ydl / (10−9 S·sn· cm−2) |
Rct / (kΩ· cm2) |
χ2 / 10−3 |
| 12 h | 1.22 × 106 | 4.6 | 8.97 | 503 | 8.99 | 3898 | 14.63 | 3012 | 5.6 | 9.84 | 875 | 5.4 |
| 18 h | 5.48 × 106 | 8.2 | 8.25 | 863 | 7.92 | 4020 | 13.40 | 3250 | 7.1 | 7.51 | 5100 | 2.4 |
| 24 h | 2.20 × 107 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.8 |
| 30 h | 6.40 × 106 | 6.8 | 6.59 | 1193 | 5.77 | 4640 | 10.21 | 3220 | 6.5 | 6.77 | 6150 | 4.9 |
| Samples (LDH-W/ PFDTMS-x) |
Ecorr / mV |
jcorr / (10–9 A·cm−2) | ßa / (mV·dec−1) | ̶ ßc / (mV·dec−1) |
| 12 h | −509 | 3.4 | 205 | 291 |
| 18 h | −452 | 2.03 | 265 | 325 |
| 24 h | −338 | 1.86 | 293 | 346 |
| 30 h | −376 | 1.96 | 284 | 339 |
| Samples | |Z|f=0.01 Hz / (Ω· cm2) |
Rs / (Ω· cm2) |
YPFDTMS / (10−9 S·sn· cm−2) |
RPFDTMS / (kΩ· cm2) |
YLDH / (10−9 S·sn· cm−2) |
RLDH / (kΩ· cm2) |
Yc / (10−9 S·sn· cm−2) |
Rc / (kΩ· cm2) |
ZW / (10−5 S·s0.5· cm−2) |
Ydl / (10−9 S·sn· cm−2) |
Rct / (kΩ· cm2) |
χ2 / 10−3 |
| Mg alloy | 2.18 × 102 | 24.5 | — | — | — | — | — | — | — | 380400 | 0.125 | 7.5 |
| LDH-W | 8.64 × 104 | 40.1 | — | — | 5820 | 5.50 | 4950 | 4.30 | 9.82 | 142500 | 39.9 | 2.40 |
| LDH-W/ PFDTMS |
2.20 × 107 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.8 |
| Samples | Ecorr / mV | jcorr / (A·cm−2) | ̶ ßc / (mV·dec−1) |
| Mg alloy | −1410 | 6.0 × 10−5 | 87 |
| LDH-W | −400 | 3.03 × 10−7 | 213 |
| LDH-W/PFDTMS | −338 | 1.86 × 10−9 | 340 |
| Samples | Immersion time / d | Rs / (Ω· cm2) | YPFDTMS / (10−9 S·sn· cm−2) | RPFDTMS / (kΩ· cm2) | YLDH / (10−9 S·sn· cm−2) | RLDH / (kΩ· cm2) | Yc / (10−9 S·sn· cm−2) | Rc / (kΩ· cm2) | ZW / (10−5 S·s0.5· cm−2) | Ydl / (10−9 S·sn· cm−2) | Rct / (kΩ· cm2) | χ2 / 10−3 |
| LDH-W | 0 | 40.1 | — | — | 5820 | 5.50 | 4950 | 4.30 | 9.82 | 142500 | 39.9 | 2.40 |
| 1 | 44.8 | — | — | 5810 | 2.98 | 5350 | 3.76 | 8.02 | 151300 | 38.87 | 3.36 | |
| 3 | 45.2 | — | — | 5700 | 3.21 | 5780 | 3.21 | 6.62 | 15500 | 38.28 | 1.45 | |
| 5 | 43.6 | — | — | 6960 | 2.4 | 5860 | 3.01 | 6.82 | 154500 | 37.57 | 1.49 | |
| 7 | 45.7 | — | — | 5540 | 3.68 | 5140 | 3.85 | 12.17 | 135300 | 37.08 | 1.72 | |
| 15 | 42.3 | — | — | 5865 | 3.58 | 5320 | 3.53 | 11.83 | 133500 | 36.25 | 2.78 | |
| LDH-W/ PFDTMS | 0 | 5.6 | 5.73 | 3750 | 3.57 | 5800 | 9.74 | 3500 | 8.7 | 5.83 | 18000 | 1.80 |
| 1 | 3 | 5.77 | 3660 | 3.59 | 5670 | 9.84 | 3437 | 8.64 | 6.74 | 17500 | 1.93 | |
| 3 | 1.8 | 5.96 | 3480 | 3.82 | 5570 | 9.92 | 3397 | 7.86 | 6.98 | 15890 | 1.22 | |
| 5 | 2.8 | 6.16 | 3371 | 3.91 | 5452 | 9.96 | 3280 | 7.55 | 8.78 | 13870 | 5.10 | |
| 7 | 1.5 | 5.93 | 3301 | 3.87 | 5490 | 9.95 | 3359 | 6.94 | 10.65 | 14620 | 1.37 | |
| 15 | 2.3 | 6.61 | 3008 | 4.11 | 5100 | 9.99 | 3256 | 6.24 | 12.33 | 12540 | 1.89 |
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