电解液浓度对镁合金微弧氧化层耐蚀性与溶血率的影响

在电解液中加入 (NaPO₃)₆并在镁合金表面制备微弧氧化层,研究 (NaPO₃)₆浓度对镁合金微弧氧化层的影响.结果显示,微弧氧化层中含有MgO,Mg₂SiO₄,Mg₃(PO₄)₂等物质;随 (NaPO₃)₆浓度增加,微弧氧化层厚度增加,表面微孔孔径变大,当 (NaPO₃)₆浓度达到7 g/L时,微弧氧化层截面出现较明显的微裂纹;微弧氧化处理后的镁合金的耐蚀性明显高于基体的.当 (NaPO₃)₆浓度为5 g/L时其耐蚀性最佳;镁合金基体溶血率为72.3%,在不同浓度 (NaPO₃)₆下微弧氧化处理的镁合金溶血率均在1%~2.5%之间,溶血作用消除.

Effect of (NaPO3)6 Concentration in Electrolyte on Corrosion Resistance and Hemolytic Rate of MAO Coatings on Magnesium Alloy

Effect of (NaPO₃)₆ addition into electrolyte on the performance of micro arc oxidation coatings on AZ31 magnesium alloy was investigated in terms of corrosion resistance and hemolytic rate. The results showed that the coatings composed of phases MgO, Mg₂SiO₄ and Mg₃(PO₄)₂; with the increasing (NaPO₃)₆ concentration, the micro-pores became bigger; and micro cracks were observed on the coatings prepared in the electrolyte containing 7 g/L (NaPO₃)₆; while the coating/Mg alloy system exhibited the best corrosion resistance when the coating prepared with electrolyte containing 5 g/L (NaPO₃)₆; the hemolytic rate was between 1% and 2.5% for all MAO coatings prepared in electrolyte with different amount of (NaPO₃)₆, in the contrary, that of the bare AZ31 alloy is 72.3%, therefore the hemolytic effect of the AZ31 alloy can be eliminated by the MAO coatings.