Effect of solution concentration on sealing treatment of Mg-Al hydrotalcite film on AZ91D Mg alloy

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Abstract

Cerium-based sealing treatment was developed for Mg-Al hydrotalcite film on AZ91D Mg alloy, and the influence of cerium salt solution was investigated to modify the surface integrity and corrosion resistance. Scanning electron microscope (SEM) and X-ray diffraction (XRD) measurements were carried out to analyze the surface morphology and phase composition. The corrosion resistance of Mg-Al hydrotalcite film after sealing treatment was evaluated by the polarization curve and electrochemical impedance spectroscopy (EIS) tests. The results showed that lower concentration of Ce-containing solution was beneficial to seal the micro-cracks on Mg-Al hydrotalcite film, and improve the surface integrity and corrosion resistance; higher concentration of Ce-containing solution could seal fewer micro-cracks, and the corrosion resistance was decreased owing to the disintegration of Mg-Al hydrotalcite film.

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Dong, Q., Ba, Z., Jia, Y., Chen, Y., Lv, X., Zhang, X., & Wang, Z. (2017). Effect of solution concentration on sealing treatment of Mg-Al hydrotalcite film on AZ91D Mg alloy. Journal of Magnesium and Alloys, 5(3), 320–325. https://doi.org/10.1016/j.jma.2017.08.005

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