摘要
采用溶胶-凝胶法,以氟锆酸钠与1,2-双(三甲氧基硅基)乙烷(BTMSE)为前驱体,在冷轧钢基体上制备无机/有机复合硅烷涂层。采用电化学技术(Tafel曲线与阳极极化曲线)及硫酸铜点滴实验对比考察复合硅烷涂层与纯硅烷涂层防腐性能。使用SEM,FTIR,XPS等测试方法考察其腐蚀前后表面形貌、官能团组成、元素价键结构等性质。结果表明:相比于纯硅烷涂层,复合涂层的腐蚀电流密度明显降低,极化电阻明显增大,腐蚀前后微观形貌基本不变。通过XPS对价键进行分析,认为在金属表面形成了Si-O-Zr键。对锆盐在金属表面成键及防腐机理进行探讨,并提出了新的结构模型。
A thin top layer composed of zirconia and organosilicone was prepared on the cold-rolled steel through condensation reactions by sol-gel method, using sodium fluozirconate and 1,2-bis（trime- thoxysilyl）ethane as precursor. The anti-corrosion property of the coating was measured by electro- chemical testing methods and CuSO4 dripping experiment. The functional groups, morphology and composition were investigated by SEM, FTIR and XPS methods, respectively. The results indicate that, compared to the pure silane coating, the corrosion current density of the composite coating is much lower and the polarization resistance increases significantly, and the morphology does not change essentially after the corrosion. The XPS analysis reveals that Si--O--Zr bond was formed on the surface. A new structural model is gave after investigating the mechanism of bonding and anti-cor- rosion of the zirconium salt on the surface.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2013年第4期50-55,62,共7页
Journal of Materials Engineering
关键词
溶胶-凝胶法
氟锆酸钠
复合硅烷涂层
结构模型
sol-gel method sodium fluozirconate composite silane coating structural model
