混合添加剂硝酸镧与纳米氧化锌对ZL205A铝合金微弧氧化膜层性能的影响  

Effects of compound additive of La(NO_3)_3 and nano-ZnO on surface properties of micro-arc oxidation coating formed on ZL205A aluminum alloy

作　　者：吴德凤[1] 张晓燕[1] 周小淞[1] 雷源源[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《功能材料》2013年第17期2559-2561,2564,共4页Journal of Functional Materials

基　　金：贵州省国际科技合作计划资助项目(2012-7001);贵州省优秀科技教育人才省长专项资金资助项目(2010-9);贵阳市社会发展与民生科技计划资助项目(2012103-70)

摘　　要：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.

关 键 词：微弧氧化 纳米氧化锌 硝酸镧 铝合金 

分 类 号：TG174.4[金属学及工艺—金属表面处理]