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利用电化学测试和扫描电镜(SEM)研究了硅烷偶联剂KH550对正硅酸乙酯(TEOS)杂化涂层的改性.结果表明:添加硅烷偶联剂能够明显提高TEOS杂化涂层的耐腐蚀性和降低涂层开裂倾向;经180℃热处理制备的KH550改性涂层性能最佳,在3.5%NaCl溶液中的腐蚀电流密度约为2.701×10~(-9)A/cm~2,较铝合金基体的4.208×10~(-5)A/cm~2低4个数量级,从而对铝合金基体具有良好的防护效果.
The electrochemical modification and scanning electron microscopy (SEM) were used to study the modification of TEOS hybrid coating with silane coupling agent KH550.The results showed that the addition of silane coupling agent could significantly improve the TEOS hybrid coating Corrosion resistance and tendency of coating cracking. The KH550 modified coating prepared by heat treatment at 180 ℃ has the best performance. The corrosion current density in 3.5% NaCl solution is about 2.701 × 10 -9 A / cm ~ 2, which is 4 orders of magnitude lower than that of 4.208 × 10 -5 (A / cm 2) of the aluminum alloy substrate, which has a good protective effect on the aluminum alloy substrate.