锆盐对金属表面硅烷膜耐蚀性能的影响

Effect of zirconium salt on corrosion resistance of silane film on metal surface

为提高硅烷膜的耐蚀性,在KH-550水解体系[V(KH-550)∶V(水)∶V(乙醇)=7∶20∶73]中添加锆盐,在Q235碳钢上制备了复合硅烷膜。通过硫酸铜点滴试验及Tafel极化曲线法,讨论了锆盐的添加方式及添加量对复合硅烷膜耐蚀性的影响,确定了最佳制备条件。用扫描电镜观察膜层表面形貌。结果表明:将碳钢直接浸入溶有锆盐的水解体系,制得的膜具有较好的致密性和耐蚀性。在保持水解体系稳定的基础上,锆盐添加量增大,膜层的耐蚀性提高。附着力测试显示,加入锆盐对膜层附着力无明显影响。

Aiming to improve the corrosion resistance of silane film, zirconium salt was added to the hydrolysis system of KH-550 （KH-550 7vo1% ＋ water 20vo1% ＋ ethanol 73vo1%） and then a composite silane film was formed on Q235 carbon steel. The effects of adding mode and amount of zirconium salt on corrosion resistance of the composite silane film were discussed through copper sulfate dropping corrosion test and Tafel curve measurement to determine the optimal preparation conditions. The surface morphology of the film was observed by scanning electron microscope. The results showed that the film obtained by directly immersing carbon steel in the hydrolysis system containing dissolved zirconium salt has good corrosion resistance and compactness. On the basis of maintaining stability of the hydrolysis system, the corrosion resistance of composite silane film is increased with increasing zirconium salt amount. The addition of zirconium salt slightly affects the adhesion of coating to substrate.