镁合金表面草酸盐化学转化膜的性能  

Performance of Oxalate Chemical Conversion Coating on Magnesium Alloy

作　　者：蒋永锋[1] 周海涛[1] 曾苏民[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料保护》2009年第9期10-11,15,共3页Materials Protection

基　　金：中国博士后科学基金项目(20070420821);湖南省博士后科研资助专项计划项目(2008RS4019);中南大学博士后基金项目(24期)

摘　　要：镁合金经化学转化处理后能提高其表面涂装的附着力和转运过程中的耐蚀性,已有的成熟镁合金表面膜的制备技术多含Cr6+类重金属离子,污染环境,不利于镁合金的回收利用。为了扩大镁合金在3C产品上的应用,研究了镁合金草酸盐化学转化膜处理工艺。借助表面分析技术和相关标准对此进行了研究。结果表明:镁合金表面形成的草酸盐化学转化膜呈乳白色,膜由均匀、细小、较致密的颗粒构成。表面经处理的镁合金经50次擦拭无颜色变化,试样表面电阻小于0.1Ω,盐雾试验超过24h,性能均达到IBM使用标准。Oxalate conversion coating was prepared on the surface of magnesium alloy so as to improve the adhesion and protective performance of 3C products and provide long-term stable ma-chined surfaces.The performance of the oxalate chemical conver-sion coating on magnesium alloy for 3C products was investigated in relation to relevant surface analysis techniques and standard as well.Results show that the oxalate coating appears to be milky and is mainly composed of fine and compact particles.Moreover,the oxalate coating retained its color after being wiped with alco-hol-cotton for over 50 times and had an electric resistance of be-low 0.1 Ω and salt spray endurance of over 24 h,meeting with the requirements specified by relevant IBM standard.

关 键 词：镁合金 草酸盐 转化膜 性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]