Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

By Gen Zhang, Liang Wu, A. Tang, Yanlong Ma, G. Song, Dajiang Zheng, Bin Jiang, A. Atrens, F. Pan. Corrosion Science, 2018

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A composite coating was produced via (i) plasma electrolytic oxidation (PEO) with Ce salt sealing, on which layered double hydroxides (LDHs) were deposited via a hydrothermal treatment, and (ii) then modified by phytic acid (PA) via an ion-exchange reaction. The final coating (characterized using XRD, XPS, FT-IR, SEM, EDS and GDOES) consisted of LDHs/Mg(OH)/CeO/Ce(OH) with a non-uniform Ce distribution. The corrosion protection and self-healing ability were investigated using polarization curves, EIS, immersion tests and SVET. The composite coating modified with PA showed the most superior corrosion protection and self-healing ability, attributed to the synergistic effect between Ce species and phosphate.

Subfields: Biomaterials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/360d50155086856af4e4817396daec7725e79ac3