Structure and corrosion resistance of electron-beam-strengthened and micro-arc oxidized coatings on magnesium alloy AZ31

Micro-arc oxidation (MAO) is very effective to enhance the corrosion performance of Mg alloys. However, micro-pores in MAO coatings provide a channel for medium reach alloy matrix. In this work, electron beam strengthening (EBS) performed improve microstructure and coating prepared subsequently performance. The crystalline size decreases, roughness improves, resistance increases. Furthermore, refinement grain by EBS improves discharge MAO. noticeable effect on lies improvement density, such as porosity reduction 47.8%. compactness also increases significantly, improving resistance. mechanism proposed.