铝合金磷钼酸钴转化工艺的研究  

Study on Process of Cobalt Phosphmolybdate Chemical Conversion on Aluminum Alloy

作　　者：李远会[1] 黄碧芳[1] 雷源源[1] 罗常青 向嵩[1] LI Yuanhui;HUANG Bifang;LEI Yuanyuan;LUO Changqing;XIANG Song(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院

出　　处：《电镀与环保》2019年第6期51-54,共4页Electroplating & Pollution Control

基　　金：国家自然科学基金(51661006;51361004)

摘　　要：采用单因素试验优化了铝合金磷钼酸钴转化工艺,并比较了铝合金基体和磷钼酸钴转化膜的耐蚀性。铝合金磷钼酸钴转化工艺的最佳配方为:磷钼酸钠0.003 7 mol/L,硫酸钴0.015 0 mol/L,氟化钠0.023 8 mol/L,pH值4,EDTA-2Na 0.000 34 mol/L,温度30℃,处理时间2 h。与铝合金基体相比,磷钼酸钴转化膜的自腐蚀电位正移约0.05 V,自腐蚀电流密度降低1个数量级。可见,磷钼酸钴转化膜能改善铝合金的耐蚀性。The process of cobalt phosphmolybdate chemical conversion on aluminum alloy was optimized by single factor experiment, and the corrosion resistance of aluminum alloy substrate and cobalt phosphmolybdate conversion coating was compared. The optimal formula of cobalt phosphmolybdate chemical conversion on aluminum alloy was as follows: sodium phosphomolybadate 0.003 7 mol/L, cobalt sulfate 0.015 0 mol/L, sodium fluoride 0.023 8 mol/L, pH value 4, EDTA-2 Na 0.000 34 mol/L, temperature 30 ℃, treatment time 2 h. Compared with aluminum alloy substrate, the self-corrosion potential of cobalt phosphmolybdate conversion coating was increased by about 0.05 V, and the self-corrosion current density was decreased by an order of magnitude. It was concluded that the cobalt phosphmolybdate conversion coating can improve the corrosion resistance of aluminum alloy.

关 键 词：铝合金 磷钼酸钴转化膜 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]