电解液中硝酸镧添加剂对铝合金微弧氧化的影响  

Effect of Content of La(NO_3)_3 in Electrolyte on MAO Coating on Al-alloy

作　　者：汪波[1,2] 张晓燕[1] 周小淞[1] 李慧[2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]上海大学材料研究所,上海200072

出　　处：《铸造技术》2013年第6期706-708,共3页Foundry Technology

基　　金：贵州省国际科技合作计划项目(2012-7001);贵阳市社会发展与民生科技计划项目(2012103-70)

摘　　要：为了进一步提高Al-Cu系铸造铝合金的表面硬度,通过在电解液中调节硝酸镧添加量,在铝合金表面制备了不同的微弧氧化陶瓷层。采用维氏硬度计、扫描电子显微镜(SEM)、X射线衍射仪(XRD)对陶瓷层性能进行了分析。结果表明,电解液中加入适量硝酸镧所生成的陶瓷层膜层厚度和显微硬度都有较大提高。当电解液中添加剂在0.4 g/L时,微弧氧化所生成的陶瓷膜层的厚度最厚、显微硬度最高。In order to improve the surface hardness of the A1-Cu system casting aluminum alloy, adding different content of lanthanum nitrate into the electrolyte, the ceramic coatings on the aluminum alloy surface were prepared by micro-arc oxidation （MAO）. The surface morphology of the coatings was observed by scanning electron microscopy, the phases of the coatings were analyzed by X-ray diffraction, and the hardness of the coatings was measured by micro Vickers hardness. The results show that adding lanthanum nitrate into the electrolyte can affect the properties of the ceramic coatings. When adding lanthanum nitrate of 0.4 g/L into the electrolyte, the ceramic coatings produced by MAO has the highest hickness and microhardness.

关 键 词：铝合金 微弧氧化 添加剂 氧化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]