Protective Micro-Arc Oxidation Surface Coating on AZ80 Forged Magnesium Alloy

Magnesium alloysMagnesium alloy, with a high weight-to-strength ratio, have attracted considerable attention for lightweight applications, especially in automotive industry. However, their inferior corrosionCorrosion properties when in contact with aqueous solutions, salt, and other metals have become a significant hindrance to more widespread use of magnesium alloysMagnesium alloy. Surface coatingSurface coating has been considered an economic and effective strategy for corrosion protectionCorrosion protection of magnesium alloysMagnesium alloy. In this work, the corrosionCorrosion behavior of uncoated and micro-arc oxidationMicro-arc oxidation (MAO) coated cast, extruded, and forged AZ80 magnesium alloysMagnesium alloy has been studied using salt fog corrosionCorrosion chamber test and microscopic characterizationCharacterization techniques. The influence of the forgingForgingprocess and MAOMicro-arc oxidation surface treatment on the corrosionCorrosion properties of the AZ80 magnesium alloysMagnesium alloy was investigated. The experimental results showed that the low forgingForging temperature of 250 °C led to fine grain sizeGrain Size and uniform distribution of secondary phase in the magnesium alloyMagnesium alloy, resulting in higher corrosionCorrosion resistance. The MAO coating provided significant corrosion protectionCorrosion protection of the AZ80 magnesium alloyMagnesium alloy substrates in the aggressive continuous salt fog environment.