以锡酸钠为主盐的AZ91D镁合金化学转化处理工艺  

Conversion Coating on AZ91D Magnesium Alloy in Stannate Solution

作　　者：吴丹[1] 杨湘杰[1] 金华兰[1] 陈祥[1] 

机构地区：[1]南昌大学机电工程学院,南昌330031

出　　处：《腐蚀与防护》2008年第2期62-65,共4页Corrosion & Protection

基　　金：科技部科技型中小企业技术创新基金项目(06C26213600314)

摘　　要：利用扫描电镜(SEM)、X射线光电子能谱(XRD)和全浸蚀试验等手段,研究了AZ91D镁合金锡酸盐化学转化膜的形貌特征及耐腐蚀性。溶液主要成分包含Na2SnO3、NaOH、乙酸钠和适量添加剂。结果表明,转化膜主要由镁的α相、β相和MgSnO3.3H2O组成;该环保型化学转化新工艺可获得银白色膜层,表面由近球状颗粒构成,孔隙分布均匀,膜层厚度在微观尺寸上较均匀。该膜层可以对AZ91D镁合金提供有效的保护。The surface morphology and corrosion resistance of the stannate conversion coating on magnesium alloy AZ91D was investigated using SEM,XRD and salt immersion test.The stannate solution contained proper Na2SnO3,NaOH,CH3COONa,and additives.The conversion coating was composed of α phase Mg,β phase Mg and MgSnO3·3H2O.The coating was silvery white and uniform,consisted of hemispherical particles,and could provide effective protection for the magnesium alloy AZ91D.

关 键 词：镁合金 锡酸盐 抗腐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]