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<p>The AZ91D magnesium alloy micro-arc oxidation ceramic layer exhibits numerous pits and microcracks, which provide channels for the penetration of corrosive media. This study utilizes the micro-arc oxidation method to form a ceramic layer containing phosphate groups on the magnesium alloy surface by adding different concentrations of trisodium phosphate. The optimal concentration of trisodium phosphate is investigated. The morphology, structure, and elemental composition of the ceramic layer were studied, along with electrochemical testing, immersion testing, and hemolysis rate testing. The results indicate that an appropriate addition of phosphate can reduce the area and number of pits, enhance the corrosion resistance of the magnesium alloy, and the hemolysis rate remains within a reasonable range. The mechanism behind these effects is also explained.</p>

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On the corrosion resistance and hemolysis rate of magnesium alloy MAO ceramic layer incorporated with phosphate ions

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Zihua Ma,
  • Jianghai He,
  • Ziyu Yang,
  • YuXuan Yang,
  • Qi Liu,
  • Shihao Xia,
  • Fei Chen

摘要

The AZ91D magnesium alloy micro-arc oxidation ceramic layer exhibits numerous pits and microcracks, which provide channels for the penetration of corrosive media. This study utilizes the micro-arc oxidation method to form a ceramic layer containing phosphate groups on the magnesium alloy surface by adding different concentrations of trisodium phosphate. The optimal concentration of trisodium phosphate is investigated. The morphology, structure, and elemental composition of the ceramic layer were studied, along with electrochemical testing, immersion testing, and hemolysis rate testing. The results indicate that an appropriate addition of phosphate can reduce the area and number of pits, enhance the corrosion resistance of the magnesium alloy, and the hemolysis rate remains within a reasonable range. The mechanism behind these effects is also explained.