Structure and properties of a duplex coating combining micro-arc oxidation and baking layer on AZ91D Mg alloy

- A duplex coating was fabricated through combining MAO and baking layer.
- A baking coating with a thickness of 92 μm was created on MAO-coated Mg alloy.
- The duplex coating noticeably improved the corrosion resistance of Mg alloy.
- The related corrosion and wear mechanisms were investigated.