冷轧钢表面硅烷复合膜的制备及耐蚀性能

采用浸涂技术,在冷轧钢板(CRS)表面制备掺杂铈离子和铬离子的γ-(2,3-环氧丙氧)丙基三甲氧基硅烷复合膜。通过电化学方法研究硅烷膜在3.50%的氯化钠溶液中的耐蚀性能,并用SEM研究存在复合硅烷膜的冷轧钢在腐蚀前后的形貌变化。结果表明掺杂了铈离子和铬离子的硅烷溶液在pH为4,水解温度为50℃,水解时间为8h条件下水解效果最好,使形成复合硅烷膜的冷轧钢在3.50%的氯化钠溶液中的自腐蚀电流密度下降到1.584×10-7A·cm-2,自腐蚀电位正移。经SEM测试表明,掺杂了铈离子和铬离子的复合硅烷膜在腐蚀前后的形貌几乎不变,耐蚀性能明显优于未掺杂的纯硅烷膜。

Preparation and corrosion resistance of silane-based composite film on surface of cold rolled steel

The γ-glycidoxy-propyl tri-methoxy silane-based composite film with cerium and chromium ions was prepared on the surface of cold rolled steel(CRS) using the immersion technique in this paper.The corrosion resistance of the composite silane film was studied in 3.50% NaCl solution by electrochemistry method.The change in the shape of the composite silane film before and after corrosion testing was researched by employing the scanning electron microscope.The result indicates that the silane solution with cerium and chromium ions, which reacts at 50℃ with the pH value 4 for 8h, has the best hydrolyzation effect.Furthermore, the corrosion current density of the CRS with composite silane films decreases to 1.584×10^-7 A·cm^-2 in 3.50% NaCl solution，and a positive shift for the corrosion potential can be observed.Test result indicates that the shape of the composite silane film with cerium and chromium ions on the CRS remains nearly unchanged after corrosion, and the corrosion resistance is apparently superior to the CRS with pure silane film.