温和条件制备镁合金超疏水耐腐蚀硅氧烷改性MgAl-LDHs涂层

张文锡; 卓张泽隆; 徐丹; 吴量; 谢治辉

doi:10.1007/s12613-024-2927-3

Volume 32 Issue 2

Feb. 2025

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文章导航 > 矿物冶金与材料学报（英文） > 2025 > 32(2): 450-463

Wenxi Zhang, Zhangzelong Zhuo, Dan Xu, Liang Wu, and Zhihui Xie, Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions, Int. J. Miner. Metall. Mater., 32(2025), No. 2, pp. 450-463. https://doi.org/10.1007/s12613-024-2927-3

Cite this article as:

Wenxi Zhang, Zhangzelong Zhuo, Dan Xu, Liang Wu, and Zhihui Xie, Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions, Int. J. Miner. Metall. Mater., 32(2025), No. 2, pp. 450-463. https://doi.org/10.1007/s12613-024-2927-3

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研究论文

温和条件制备镁合金超疏水耐腐蚀硅氧烷改性MgAl-LDHs涂层

1)
西华师范大学化学化工学院化学合成与污染控制四川省重点实验室, 南充 637002, 中国
2)
重庆大学材料科学与工程学院/国家镁合金材料工程技术研究中心, 重庆 400044, 中国

通讯作者:
谢治辉 E-mail: zhxie@cwnu.edu.cn

文章亮点

(1) 全流程相对温和条件下于镁合金表面获得LDH基复合涂层，显著提升工业应用的可能性。

(2) 复合涂层在中性腐蚀环境中对镁合金具有良好的腐蚀保护能力。

(3) 复合涂层对多种溶液和常见饮料具有良好的排斥能力。

中文摘要

LDHs是一种二维无机纳米材料，具备良好的离子交换和腐蚀介质捕获等能力，可为镁合金提供优异的腐蚀防护屏障。但是，LDHs涂层通常存在微纳米级孔隙和丰富的羟基，限制了腐蚀防护能力。本研究在常压和相对较低温度下，于镁合金表面制备了一种超疏水耐腐蚀的LDH-W/PFDTMS 复合涂层。复合涂层由钨酸盐改性的、原位生长的（LDH-W）底层和通过在全氟癸基三甲氧基硅烷（PFDTMS）溶液中浸泡形成的聚硅氧烷外层组成。通过 X 射线衍射（XRD）、傅立叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）等表征表明，钨酸盐成功插入到 LDH 层间以及聚硅氧烷层的形成。使用电化学阻抗谱（EIS）、塔菲尔曲线和盐雾实验等评估了 PFDTMS 改性前后 LDH-W 薄膜的耐腐蚀性。结果表明，与未改性的 LDH-W 薄膜相比， LDH-W/PFDTMS涂层具有明显增强的腐蚀保护性能，在盐雾中暴露半个月后无明显腐蚀迹象。该研究可为在镁合金表面制备超疏水和耐腐蚀的LDH 基复合涂层提供借鉴。

关键词:

Research Article

Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions

+ Author Affiliations

Abstract

Abstract

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg alloy. This composite comprised a tungstate-intercalated (LDH-W) underlayer that was grown at low temperature (relative to hydrothermal reaction conditions) under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane (PFDTMS) using a simple immersion method. The successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the LDH-W film, both before and after the PFDTMS modification, was evaluated using electrochemical impedance spectroscopy (EIS), Tafel curves, and immersion experiments. The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDH-W film, with no apparent signs of corrosion after exposure to 3.5wt% NaCl solution for 15 d. Furthermore, the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages, as confirmed by static contact angle and water-repellency tests. These results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.
- Mg alloy;
- corrosion;
- coating;
- layered double hydroxide

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