NaAlO_2-K_2ZrF_6体系铝合金微弧氧化膜层组织及性能研究

Structure and Properties of Micro-arc Oxidation Coatings on Aluminum Alloys in NaAlO_2-K_2ZrF_6 System

在NaAlO2-K2ZrF6组成的电解液体系中,利用微弧氧化的方法在LY12铝合金的表面制备陶瓷膜。结果表明,膜层由α-Al2O3、γ-Al2O3和分布于膜外层的c-ZrO2组成,沿膜层截面由内向外α-Al2O3减少,γ-Al2O3和c-ZrO2增加。8 g/L NaAlO2-1 g/L K2ZrF6体系与NaAlO2体系的膜层比较,具有更大的硬度和更好的耐磨性及耐腐蚀性能:最大硬度提高了25.69%,磨损率下降了64.29%,摩擦系数略有下降,腐蚀电流密度降低了96.34%。

Ceramic coatings were prepared by micro-arc Oxidation （MAO） process on a LY12 aluminum alloy in a NaAlO2 solution doped with KzZrF6. The results show that the ceramic coating is composed of α-Al2O3、γ-Al2O3 and c-ZrO2, of which c-ZrO2 mainly exist in the outer layer of the coating. Along the coating section from the inner to the outer, the content of α-Al2O3 declines while the contents of γ-Al2O3 and c-ZrOz increase. Compared with the coating prepared in NaAlO2 system, the coating prepared in 8 g/ L NaAlO2-1g/L K2ZrF6 presents a higher hardness and better anti-abrasion and corrosion resistance. The maximum hardness is improved by 25.69% , the wear rate was decreased by is reduced by 64.29% and the friction coefficient is decreased a little, and the corrosion current is reduced by 96.34%.