镀锌钢表面氟锆酸盐/7-碘-8-羟基喹啉-5-磺酸复合转化膜的制备与耐蚀性研究  

Preparation of fluorozirconate/7-iodo-8-hydroxyquinoline-5-sulfonic acid composite conversion coating on zinc-electroplated steel and study on its corrosion resistance

作　　者：万园园[1] 郭瑞光[1] 

机构地区：[1]西安建筑科技大学西北水资源与环境生态教育部重点实验室,陕西西安710055

出　　处：《电镀与涂饰》2017年第8期387-393,共7页Electroplating & Finishing

基　　金：国家自然科学基金(20976143)

摘　　要：通过单因素试验确定了在镀锌钢表面制备氟锆酸盐/7-碘-8-羟基喹啉-5-磺酸(C_9H_6INO_4S)复合转化膜的最佳条件为:氟锆酸钾4g/L,C_9H_6INO_4S0.06g/L,硼酸3g/L,温度35°C,pH3.6,时间30min。利用扫描电镜(SEM)、能谱(EDS)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、中性盐雾(NSS)试验、极化曲线测量和电化学阻抗谱(EIS)研究了转化膜的形貌、结构、组成及耐蚀性能。结果表明,由ZrF4、ZrO2和磺酸锌配合物组成的转化膜层使得镀锌钢的耐中性盐雾时间超过120h。The optimal conditions for preparing a fluorozirconate/7-iodo-8-hydroxyquinoline-5-sulfonic acid （C9H6INO4S） composite conversion coating on Zn-electroplated steel were determined by single-factor experiment as follows： K2ZrF6 4g/L, C9H6INO4S 0.06 g/L, H3BO3 3 g/L, temperature 35℃, pH 3.6, and time 30 min. The morphology, microstructure, elemental composition and corrosion resistance of the conversion coating were studied by scanning electron microscopy （SEM）, energy-dispersive spectroscopy （EDS）, X-ray photoelectron spectroscopy （XPS）, Fourier-transform infrared spectroscopy （FT-IR）, neutral salt spray （NSS） test, polarization curve measurement and electrochemical impedance spectroscopy （EIS）. The results showed that the conversion coating is composed of ZrF4, ZrO2 and zinc-sulfonic acid complex, and makes the time to failure of Zn-electroplated steel exceed 120 hours in NSS test.

关 键 词：钢 电镀锌 氟锆酸盐 7-碘-8-羟基喹啉-5-磺酸 转化膜 耐蚀性 电化学 

分 类 号：TQ153.15[化学工程—电化学工业] TG178[金属学及工艺—金属表面处理]