在硅酸盐电解液中添加复合添加剂硝酸镧(La(NO3)3)和纳米氧化锌(纳米ZnO)对铸造铝合金进行微弧氧化实验。通过涡流测厚仪、扫描电镜、显微硬度计、X射线衍射仪等分析复合添加对膜层的厚度、硬度、腐蚀性能的影响。结果表明,复合添加剂La(NO3)3+纳米ZnO的加入可提高膜层的耐蚀性,增加膜层的厚度和硬度。当La(NO3)3含量为0.5g/L,纳米 ZnO 含量为3g/L时,获得的膜层厚度和硬度较大。
Ceramic coatings were fabricated on ZL205A aluminum alloy during micro-arc oxidation by mixing La (NO3 )3 and nano-ZnO into the metasilicate electrolyte.The effects of compound additive of La (NO3 )3 and nano-ZnO in electrolyte on thickness,hardness,corrosion resistance and microstructure of the ceramic coatings were analyzed.The results show that nano-ZnO was deposited on the surface layer of the ceramic coatings in micro-arc oxidation reaction process.The corrosion resistance of the coatings was thus improved.Both the thickness and hardness of the ceramic coatings increased a lot.The optimal addition amount of La(NO3 )3 and nano-ZnO in the electrolyte was 0.5 and 3g/L.
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