化学转化温度对AZ31B镁合金镨盐转化膜耐蚀性的影响  

Effect of temperature on corrosion resistance of chemical conversion film formed on AZ31B magnesium alloy from a praseodymium salt bath

作　　者：刘坤 邹忠利[1] 马琳梦 李洋 LIU Kun;ZOU Zhongli;MA Linmeng;LI Yang(College of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院,宁夏银川750021

出　　处：《电镀与涂饰》2022年第13期958-964,共7页Electroplating & Finishing

基　　金：2019年度北方民族大学校级重点项目(2019KJ10);宁夏回族自治区自然科学基金(2020AAC03193)。

摘　　要：采用Pr(NO_(3))_(3)·6H_(2)O为成膜主盐对AZ31B镁合金表面进行化学转化。使用扫描电镜与X射线衍射仪分析了转化膜的形貌和相结构。通过浸泡腐蚀试验、塔菲尔曲线测量、电化学阻抗谱和莫特−肖特基曲线测量研究了化学转化温度对膜层耐蚀性的影响。结果表明,转化膜的主要成分为Pr的氢氧化物和氧化物,转化温度为50℃时所得膜层最均匀、致密,耐蚀性最佳。Chemical conversion was conducted on AZ31B magnesium alloy by using Pr(NO_(3))_(3)·6H_(2)O as the main salt for film formation.The morphology and phase structure of conversion film were characterized by scanning electron microscopy and X-ray diffraction.The effect of conversion temperature on the corrosion resistance of conversion film was studied by immersion corrosion test,Tafel curve measurement,electrochemical impedance spectroscopy,and Mott-Schottky curve measurement.The results showed that the conversion film was mainly composed of Pr-containing hydroxide and oxide.The conversion film obtained at 50℃ featured the most uniform and compact surface,as well as the best corrosion resistance.

关 键 词：镁合金 镨盐 化学转化 耐蚀性 电化学分析 莫特−肖特基曲线 

分 类 号：TQ153.6[化学工程—电化学工业]