Research Progress on the Wear and Corrosion Resistant Plasma Electrolytic Oxidation Composite Coatings on Magnesium and Its Alloys

Plasma electrolytic oxidation (PEO), as a cost effective and environmentally friendly technology, has been applied on magnesium and its alloys to improve wear and corrosion resistance. Additionally, combining with particles addition in the electrolyte and/or various post-treatments could diminish the intrinsic structural defects of the PEO coatings and provide multifunctionalities, including wear resistance, corrosion resistance, self-lubrication, and self-healing. This paper reviews recent progress on PEO composite coatings prepared by in situ incorporation of functional particles and/or post-treatments on magnesium and its alloys. The focus is given to the microstructural and functional changes of the PEO coatings, particularly on the wear and corrosion behaviors.

Automated summary

Plasma electrolytic oxidation (PEO) is a cost effective and environmentally friendly technology that has been used to improve wear and corrosion resistance in magnesium and its alloys. By incorporating functional particles and/or using post-treatments, the PEO coatings can be further improved to provide multifunctionalities, such as wear resistance, corrosion resistance, self-lubrication, and self-healing. This paper reviews recent progress in PEO composite coatings on magnesium and its alloys, focusing on the microstructural and functional changes of the PEO coatings, particularly in terms of wear and corrosion behaviors.