加水量与TEOS/MTES比例对有机-无机复合涂层防腐性能的影响

Effect of of Water Amount and TEOS/MTES Ratio on Anti-Corrosion Property of Organic-Inorganic Film

采用溶胶-凝胶法,以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为前驱体,在钢片上制备有机-无机复合防腐薄膜。通过傅里叶红外光谱(FTIR)、扫描电镜(SEM)等测试手段研究薄膜材料的结构及性质的变化,并通过盐雾腐蚀试验和电化学阻抗谱测试对复合薄膜的防腐蚀性能进行检测,探讨加水量(R)、两种前驱体比例等溶胶凝胶过程工艺条件对防腐涂层结构及防腐性能的影响。结果表明,随加水量的增加,涂层防腐性能下降,随着TEOS/MTES比例由1:1到1:4,涂层防腐性能增强,涂层在R=2,TEOS/MTES=4时防腐性能最佳,较空白钢片阻抗提高2个数量级。

With TEOS and MTES as precursors, HCl as catalyzer, organic-inorganic compound anti-corrosion film was prepared by a sol-gel method. The structure and properties of the film was studied by FTIR, SEM, and EIS measurement. The results indicate that with the amount of water R increasing from 2 to 8 and the ratio of TEOS to MTES changing from 1:4 to 1:1, the anti-corrosion performance became worse. The optimal reactive condition is that R is 2 and ratio of TEOS to MTES is 1:4. Under the optimal condition, the impedance magnitude (|Z|) of coated steel plate is larger than the uncoated one in 2 degree.