PEO-硅氧烷复合膜层在酸性介质中的耐腐蚀性能  

Corrosion resistance in acidic medium for composite film obtained by combination of plasma electrolytic oxidation and siloxane treatment

作　　者：曾娣平 刘志义[2] 郭文敏[1,3] 吴海江 唐校福 ZENG Diping;LIU Zhiyi;GUO Wenmin;WU Haijiang;TANG Xiaofu(Department of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China;Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing,Shaoyang University,Shaoyang 422000,China)

机构地区：[1]邵阳学院机械与能源工程学院,湖南邵阳422000 [2]中南大学材料科学与工程学院,湖南长沙410083 [3]邵阳学院高效动力系统智能制造湖南省重点实验室,湖南邵阳422000

出　　处：《电镀与涂饰》2022年第10期699-706,共8页Electroplating & Finishing

基　　金：湖南省教育厅科研青年项目(21B0674);国家重点研究发展计划项目(2016YFB0300900)。

摘　　要：为了防止腐蚀介质通过等离子体电解氧化(PEO)膜上的微孔或微裂纹等微观缺陷向基底渗透,采用由四乙氧基硅烷(TEOS)和3-(甲基丙烯酰氧)丙基三甲氧基硅烷(MAPTS)形成的硅氧烷聚合物溶胶对Al-Zn-Mg-Cu合金表面的PEO膜进行封孔,得到PEO-硅氧烷复合膜层。采用傅里叶变换红外光谱仪(FT-IR)分析了硅氧烷膜的化学结构,通过扫描电子显微镜(SEM)观察了PEO膜和PEO-硅氧烷复合膜层的微观形貌,通过电化学阻抗谱(EIS)和动电位极化曲线测量对比了PEO膜和PEO-硅氧烷复合膜层在酸性腐蚀介质中的腐蚀行为。结果表明,采用硅氧烷聚合物溶胶处理能够在PEO膜上形成连续的硅氧烷膜,所得的PEO-硅氧烷复合膜层在酸性腐蚀介质中的耐腐蚀性能远优于PEO膜层。In order to prevent the corrosive media penetrating to substrate through the microscopic defects(such as micropores and microcracks)of a plasma electrolytic oxidation(PEO)film,a siloxane polymer sol synthesized from tetraethoxysilane(TEOS)and 3-(methacryloxy)propyltrimethoxysilane(MAPTS)was used to seal the PEO film on Al-Zn-Mg-Cu alloy substrate,forming a PEO-siloxane composite film.The chemical structure of the siloxane layer was analyzed by Fourier-transform infrared spectroscopy(FT-IR).The micromorphologies of PEO film and PEO-siloxane composite film were observed by scanning electron microscopy(SEM),and their corrosion behaviors in corrosive acid solution was compared by electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization measurement.The results showed that a complete silane layer could be formed on the PEO film by treating with siloxane polymer sol.The corrosion resistance of the PEO-siloxane composite film was much better than that of PEO film.

关 键 词：等离子体电解氧化 硅氧烷聚合物溶胶 复合膜层 酸性介质 耐腐蚀性能 

分 类 号：TQ153.6[化学工程—电化学工业]