AZ91D镁合金表面无铬化学转化膜的研究  

Non-chrome Chemical Conversion Coating on Surface of AZ91D Magnesium Alloy

作　　者：王辰浩[1] 夏兰廷[1] 臧东勉[1] 师素粉[1] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原020034

出　　处：《铸造设备研究》2008年第3期17-20,共4页Research Studies On Foundry Equipment

摘　　要：采用磷酸盐-高锰酸盐在不同pH值条件下对AZ91D镁合金化学转化处理,检测了不同转化膜的腐蚀率,当转化液pH值为4～5时耐蚀性最佳。用XRD分析,转化膜为非晶态结构,SEM观察转化膜表面均匀,存在有利于增强涂装层附着力的网状裂纹。经EDS和XPS分析表明,转化膜主要成分为:Mg、Al、Mn、O元素,由MgO、Mg(OH)2、MgAl2O4、Al2O3、Al(OH)3、MnO2组成。AZ91D magnesium alloy was processed by Phosphate-permanganate conversion coating at different pH value,and corrosion rate was tested. The results showed the coating gained at pH value of 4-5 had the best corrosion resistence. The XRD pictures indicate that conversion coating was amorphous structure. The SEM results showed that the compositions of conversion coating are well distributed and had reticular crackle, which was in favor of increasing adhesion of coating. The EDS and XPS results showed the components of conversion coating contained Mg, Al, Mn ,O, make of MgO, Mg（OH）2, MgAl2O4,Al2O3,Al（OH） 3, MnO2.

关 键 词：镁合金 化学转化膜 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]