A novel CeO2/MgAl2O4 composite coating for the protection of AZ31 magnesium alloys
- 94 Downloads
A novel CeO2/MgAl2O4 composite coating, fabricated via a cathode plasma electrolytic deposition (CPED) technique followed by hydrothermal synthesis, was developed in this study to explore its potential application as corrosion protection for AZ31 magnesium alloys. The microstructure observed through scanning electron microscopy indicated that reducing the duty cycle of the power source within a reasonable range during the CPED process was beneficial to form a uniform and dense MgAl2O4 coating, which served as an ideal adhesive matrix for a uniform CeO2 coating as the outermost layer. The results of electrochemical impedance spectra and neutral salt spray tests showed that the decoration of the CeO2 layer significantly improved the corrosion resistance of the CeO2/MgAl2O4 composite coating compared to the single MgAl2O4 coating and bare substrate. Cross-cut tests revealed that the adhesion of the MgAl2O4 coating and the CeO2/MgAl2O4 composite coating were both excellent due to the strong binding between the MgAl2O4 coating and the substrate.
This work was supported by the National Natural Science Foundation of China (Grant Number 51771027), the National Key Research and Development Program of China (Grant Number 2017YFB0702100) and the Fundamental Research Funds for the Central Universities (Grant Number FRF-BD-18-019A).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 1.Cao F, Song G, Atrens A (2016) Corrosion and passivation of magnesium alloys. Eval Program Plan 111:835–845Google Scholar
- 3.Cui L, Gao S, Li P et al (2017) Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31. Eval Program Plan 118:84–95Google Scholar