中文摘要：

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（C9H6INO4S）复合转化膜的最佳条件为：氟锆酸钾4g/L，C9H6INO4S 0.06g/L，硼酸3g/L，温度35℃，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。

英文摘要：

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.