冷轧钢表面硅烷膜的制备及耐蚀性能研究

Preparation of silane film on the surface of cold rolled steel for corrosion protection

文章采用浸涂技术,在不同方式预处理的冷轧钢板(CRS)表面制备γ-氨丙基三甲氧基硅烷膜,通过电化学方法和SEM研究硅烷膜在质量分数为3.5%NaCl溶液中的耐蚀性能及冷轧钢腐蚀前后的形貌变化。结果表明,浸涂前分别采用质量分数均为0.10%CeCl3溶液和NaOH溶液(特别是CeCl3溶液)对冷轧钢表面进行成膜前预处理,均有利于冷轧钢表面形成均匀致密的硅烷膜,使冷轧钢在3.5%NaCl溶液中的腐蚀电流密度明显降低,腐蚀反应的极化电阻明显增大,耐蚀性能明显提高。经SEM测试表明,腐蚀前后冷轧钢表面硅烷膜的形貌几乎不变。

The γ-aminopropyltriethoxysilane film was deposited on differently pretreated cold rolled steel（CRS） using the immersion technique.The corrosion resistance of the silane film was investigated in 3.5% NaCl solution,using Tafel polarization and electrochemical impedance spectroscopy（EIS）.The morphologies of the silane film before and after corrosion testing in 3.5% NaCl solution were characterized through scanning electron microscope（SEM）.The results indicate that uniform and compact silane film could be formed on the CRS when the surface of CRS was pretreated in 0.10%CeCl3 or 0.10%NaOH,especially in the the former solution.The prepared film led to the large increase in polarization resistance and therefore the evident decrease in corrosion current density.The morphology of the silane film on the CRS remained nearly unchanged before and after corrosion.