四硼酸钠对镁合金锡酸盐转化膜性能的影响  

Effect of Sodium Tetraborate on the Properties of Stannate Conversion Film of Magnesium Alloys

作　　者：董春艳[1] 安成强[1] 郝建军[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳100159

出　　处：《电镀与精饰》2012年第5期33-35,共3页Plating & Finishing

摘　　要：以压铸AZ91D镁合金为基体,用添加四硼酸钠的锡酸盐转化液在其表面制备出无铬化学转化膜。采用点滴试验、极化曲线及交流阻抗对转化膜耐蚀性进行了测试,并用扫描电子显微镜和X-射线衍射仪研究了转化膜的微观形貌和组成,结果表明,添加四硼酸钠的锡酸盐转化膜的膜层致密,耐蚀性明显提高,膜层主要成分为MgSn(OH)6。Chrome free conversion film was prepared on AZ91D magnesium alloy by using stannate solution with addition of sodium tetraborate.Corrosion resistance of the conversion film was investigated by dropping test,polarization curve and electrochemical impedance spectrum,and the surface morphology and structure were observed and determined by scanning electron microscopy and X-ray diffraction apparatus.Results showed that the conversion film was uniform and compact,and mainly composed by MgSn（OH）6.Compared with the film by simple stannate solution,the conversion film by stannate and sodium tetraborate solution had a higher corrosion resistance.

关 键 词：镁合金 转化膜 锡酸盐 四硼酸钠 

分 类 号：TG174.41[金属学及工艺—金属表面处理]