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[Wang Zhanying,Ma Ying,An Shoujing,Wang Sheng and An Lingyun.Effect of electrolytes on the formability and corrosion resistance of micro-arc oxidation coating of AZ91D magnesium alloy[J].Rare Metal Materials and Engineering,2022,51(8):3057~3069.]
Effect of electrolytes on the formability and corrosion resistance of micro-arc oxidation coating of AZ91D magnesium alloy
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Received:July 22, 2021  Revised:August 31, 2021
DOI:
Key words: AZ91D magnesium alloy  micro-arc oxidation  electrolyte  formability  regression analysis
Foundation item:甘肃省创新研究群体计划(1111RJDA011)
Author NameAffiliation
Wang Zhanying,Ma Ying,An Shoujing,Wang Sheng and An Lingyun  
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Abstract:
      Micro-arc oxidation coatings were prepared on AZ91D magnesium alloy by changing the collocation of Na2SiO3, NaOH, KF and NaAlO2 based on simplex-centroid mixture design. The effects of electrolyte components on the formability and corrosion resistance of the coating were investigated. The results show that the obtained regression equation is very significant and has high prediction accuracy. Pareto analysis shows that the four electrolytes have significant effects on the corrosion resistance of the coating. Response surface analysis shows that increasing the concentration of Na2SiO3 or NaAlO2 can significantly improve the corrosion resistance of the coating. But the combination of the two is detrimental to the improvement of the corrosion resistance. The main salt is very important for increasing the coating formability and corrosion resistance. When the electrolyte does not contain the main salt, the coating formability and corrosion resistance are very poor. The appropriate increase of NaOH and KF concentration in the electrolyte containing the main salt is also beneficial to improve the corrosion resistance. According to Pearson correlation analysis, the corrosion resistance primarily depends on the coating density and porosity, and is also affected by other characteristic parameters such as thickness and composition. The components of the electrolyte affect the properties of the coating through influencing the above microstructure parameters.