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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。
An organic-inorganic composite anti-corrosion film was prepared on steel by sol-gel method using tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) as precursors. The structures and properties of the films were investigated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The corrosion resistance of the films was tested by salt spray corrosion and electrochemical impedance spectroscopy. The effects of sol-gel process conditions, such as the amount of water (R) and the ratio of two precursors, on the structure and corrosion resistance of anti-corrosion coatings were investigated. The results showed that the anticorrosive properties of the coating decreased with the increase of the amount of water. With the ratio of TEOS / MTES from 1: 1 to 1: 4, the corrosion resistance of the coating was enhanced. The coating was anticorrosive at R = 2 and TEOS / MTES = 4 The best performance, compared with blank steel resistance increased by 2 orders of magnitude.