Ordering and disordering of <i>in situ</i> grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties

Muhammad Ahsan Iqbal; Michele Fedel

doi:10.1007/s12613-019-1844-3

Volume 26 Issue 12

Dec. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(12): 1570-1577

Muhammad Ahsan Iqbal and Michele Fedel, Ordering and disordering of in situ grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1570-1577. https://doi.org/10.1007/s12613-019-1844-3

Cite this article as:

Muhammad Ahsan Iqbal and Michele Fedel, Ordering and disordering of in situ grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1570-1577. https://doi.org/10.1007/s12613-019-1844-3

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Research Article

Ordering and disordering of in situ grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties

Muhammad Ahsan Iqbal and
Michele Fedel

+ Author Affiliations

Corresponding author:
Muhammad Ahsan Iqbal E-mail: muhammadahsan.iqbal@unitn.it
Received: 1 January 2019; Revised: 22 February 2019; Accepted: 11 March 2019

Abstract

Abstract

A MgAl-layered double hydroxide (MgAl-LDH) protective film was developed on AA6082 substrates via the in situ hydrothermal growth method to obtain a distinct cauliflower-like LDH structure, and coated substrates were further heat-treated in air at temperatures from 100 to 250℃ to further improve the corrosion resistance of MgAl-LDH by taking advantage of the LDH memory effect; also, the effect of calcination on MgAl-LDH structural stability and the corresponding corrosion resistance properties were investigated. The structural characterization of uncalcined and calcined LDH films were examined using scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy. The corresponding corrosion protection efficiency of the developed coating was studied through potentiodynamic polarization experiments and by electrochemical impedance spectroscopy. Compared with uncalcined MgAl-LDH, the calcined film showed a relatively lower corrosion current density and a higher impedance value, especially after heat treatment at 250℃. The findings demonstrate that calcination strongly affects the oriented growth of the LDH and causes an increase in the surface area and contraction of the basal spacing, which in turn caused a compact structure that substantially influenced the LDH corrosion resistance properties.
- layered double hydroxide;
- calcination;
- in situ growth;
- thin films;
- corrosion protection

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