镁合金环保型化学转化膜工艺研究  

Technology of environment-friendly chemical conversion coating for magnesium alloy

作　　者：吴丹[1] 杨湘杰[1] 王建永[2] 金华兰[1] 叶寒[1] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]南昌大学环境科学与工程学院,江西南昌330031

出　　处：《金属热处理》2008年第3期86-90,共5页Heat Treatment of Metals

基　　金：科技部科技型中小企业技术创新基金项目(06C26213600314);南昌大学分析测试中心测试基金

摘　　要：采用环保型化学转化工艺,利用扫描电镜、X射线衍射和全浸蚀等分析试验手段,研究了AZ91D镁合金锡酸盐化学转化膜的形貌、相结构及耐腐蚀性。结果表明,转化膜主要由镁的α相、β相和MgSnO3.3H2O组成;该环保型化学转化工艺可获得由近球状微粒构成的银白色膜层,表面均匀平整。该膜层的耐蚀性能优于传统含铬DOW 7工艺形成的防护膜,且所用成膜液无铬,符合环保要求。The surface morphologies, phase structures and corrosion resistance of the stannate conversion coating on AZ91D magnesium alloy gained from an environment-friendly conversion process were investigated by using SEM ,XRD and salt immersion test. The results show that the conversion coating consisted of α phase, β phase and MgSnO3·3H2O. The silvery white coating composed of sphere-like particle layer formed uniform right on the under layer, with uniformand level surface. The environment-friendly chromium-free process was more effective to improve the corrosion resistance of magnesium alloys than that of the traditional DOW7 process.

关 键 词：环保型化学转化膜工艺 镁合金 锡酸盐 抗腐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理] TG178[金属学及工艺—金属学]