Construction and properties of a multifunctional stearic acid modified CeO2 coating on anodized AZ31B Mg alloy

In this work, the anodized coating was firstly prepared at low voltage on AZ31B Mg alloy, and followed by one-step hydrothermal treatment to produce stearic acid modified CeO2 coating with superhydrophobic performance. The anodized coating prepared at low voltage combined well with the substrate without obvious micropores and microcracks. The outer stearic acid modified CeO2 coating with spherical morphology covered the inner anodized coating compactly. The composite coating showed excellent superhydrophobicity (CA=164.7o) and self-cleaning performance. Meanwhile, the corrosion resistance of the substrate coated with the composite coating had been significantly improved. When the composite coating is scratched, the Ce ions might gradually release from the coating and convert into newly formed Ce-based compounds to prevent the further corrosion, exhibiting a self-healing behavior.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

In this study, an anodized coating was prepared at low voltage on AZ31B Mg alloy, followed by one-step hydrothermal treatment to produce stearic acid modified CeO2 coating with superhydrophobicity. The anodized coating combined well with the substrate, and the outer stearic acid modified CeO2 coating covered the inner anodized coating compactly. The composite coating showed excellent superhydrophobicity and self-cleaning performance, while greatly improving the corrosion resistance of the substrate. The Ce ions released from the coating upon scratching might prevent further corrosion, exhibiting self-healing behavior.