Corrosion resistance of micro-arc oxidation coating on laser-treated magnesium alloy

Document Type

Article

Publication Date

2-11-2026

Department

Department of Materials Science and Engineering

Abstract

The high corrosion rate of magnesium-based materials limits their use in clinical applications. To tackle this problem, laser surface texturing (LST) treatment and laser surface textured micro-arc oxidation (LST/MAO) were performed on an Mg0.5Ca magnesium alloy. These treatments aimed to enhance the material’s corrosion resistance. The LST treatment produced a microgroove structure, while LST/MAO produced a porous morphology characterized by micropores and microcracks. The primary phases present in the LST/MAO coating included α-Mg, MgO, and Ca(PO4)2; in contrast, only the α-Mg and MgO phases were found in the LST-treated sample. The LST/MAO coating demonstrated the porous structure along with relatively smooth areas that adhered strongly to the substrate. When compared to the uncoated and LST-treated samples, the LST/MAO-coated sample exhibited high corrosion resistance over a two-week period. These findings suggest that the corrosion resistance and bioactivity of Mg alloy were improved greatly by combination of LST and MAO treatment.

Publication Title

Surface Innovations

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