AZ91D镁合金表面钼-钛-锰导电膜化学转化工艺及其性能研究
Preparation of conductive Mo-Ti-Mn coating on AZ91D magnesium alloy by chemical conversion and study on its properties
易爱华 1祝闻 2雷华 1黄智泉 1王政 1董家仁2
作者信息
- 1. 广州城市职业学院,广东 广州 510405
- 2. 东莞理工学院 材料科学与工程学院,广东 东莞 523808
- 折叠
摘要
[目的]对镁合金进行表面处理可获得兼具导电性和耐蚀性的膜层,进而满足电子通信领域的使用要求.[方法]采用以(NH4)2MoO4、H2TiF6和KMnO4为主成分的溶液,在AZ91D镁合金表面通过化学转化技术制备了钼-钛-锰(用MTM表示)导电膜.研究了前处理工艺和化学转化液的KMnO4 质量浓度对MTM膜层外观、形貌、组成、耐蚀性和导电性的影响.[结果]对AZ91D镁合金进行打磨、碱洗、酸洗、表调等前处理后在含4.2 g/L KMnO4的转化液中处理所得的MTM膜层表面拥有最大面积分数的β相导电斑点,耐蚀性较好,导电性最佳(禁带宽度和接触电阻分别为2.556 eV和0.428 Ω/in2).[结论]本工艺制备的MTM膜层耐蚀性和导电性良好,在电子通信领域具有很好的应用前景.
Abstract
[Introduction]Suitable surface treatment of magnesium alloy make it possible to form a coating with excellent conductivity and corrosion resistance,meeting the application requirements of electronic communication.[Method]A conductive Mo-Ti-Mn(code as MTM)coating was prepared on the surface of AZ91D magnesium alloy by chemical conversion in an electrolyte primarily composed of(NH4)2MoO4,H2TiF6,and KMnO4.The effects pretreatment method and KMnO4 concentration in electrolyte on the properties of MTM coating i.e.appearance,morphology,composition,corrosion resistance,and conductivity were studied.[Result]The MTM coating formed on the AZ91D magnesium alloy pretreated by sanding,alkaline cleaning,pickling,and surface conditioning successively by conversion with 4.2 g/L of KMnO4 had the largest area fraction of β-phase conductive spots,good corrosion resistance,and the best conductivity(as shown by band gap 2.556 eV and electric contact resistance 0.428 Ω/in2).[Conclusion]The MTM film prepared by the given process has a good application prospect in electronic communication due to its excellent corrosion resistance and conductivity.
关键词
镁合金/化学转化/高锰酸钾/前处理/禁带宽度/接触电阻/耐蚀性Key words
magnesium alloy/chemical conversion/potassium permanganate/pretreatment/band gap/electric contact resistance/corrosion resistance引用本文复制引用
基金项目
广东省普通高等学校特色创新项目(自然科学)(2023)(2023KTSCX147)
东莞市社会科技发展(重点)项目(2020507140151)
出版年
2024
NETL
NSTL
万方数据