铝合金表面无铬导电转化膜工艺改进研究  

Study on Process Improvement for Chrome-free Chemical Conversion Film on Aluminum Alloy

作　　者：马登龙[1] 梁燕萍[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《表面技术》2008年第5期49-51,共3页Surface Technology

摘　　要：为了在铝合金表面得到实用的导电氧化膜,探索优良的成膜工艺,采用钼酸盐作为主要成膜氧化剂,在溶液中添加高锰酸钾、氟化钠等成分,利用浸渍法在铝合金表面制备出金黄色的钼酸盐导电转化膜,并且在此基础上通过添加其他试剂,改变处理方式等方法研究这些工艺对转化膜性能的影响。结果表明在转化液中添加氯化亚锡可降低膜层的电阻率至2.45mΩ;添加硫酸亚铈可明显地提高膜层的耐蚀性;经过热水沸水前处理和热水封闭后处理也可以提高导电转化膜的耐蚀性,改善膜层的导电性。In order to develop an environment friendly method to form chemical conversion coating on aluminum surface without the toxic hexavalent eharomium compounds, a process with ammonium molybdate and potassium penmanganate as the oxidants in the treating solution was investigated. The deep-yellow molydate conductive conversion coating on the aluminum alloy was obtained by adding ingredients such as NaF, SnCl2, Ce2 （SO4）3 to the aqueous solution and taking the process of immersion. To find a better process, the different dealing ways before and after treating in the conversion solution were taken. The results show that the SnCl2 can debase the electric resistance of the coatings （ to the 2.45 mΩ·cm）. And corrosion resistance can be improved evidently by adding Ce2 （ SO4 ） 3. For the aluminum alloy, the conversion coating treated with in boiling water before its treating and sealed in hot water after treating can provide excellent corrosion protection.

关 键 词：铝合金 转化膜 导电膜 钼酸盐 

分 类 号：TG174.451[金属学及工艺—金属表面处理]