为了改善铝合金材料的耐腐蚀性能,本研究用正硅酸乙酯(TEOS)为主要原料,加入一定量的去离子水、KH-550和纳米SiO2,以冰乙酸为催化剂制备溶胶.通过浸渍-提拉法和相应的处理在铝合金基体表面形成杂化涂层,通过电化学测试和扫描电镜(SEM)观察,结果表明:添加纳米SiO2制备的涂层有效地提高了铝合金在 3.5%NaCl溶液中的防腐性能,使铝合金基体的耐腐蚀性能和稳定性得到大幅度的提高.涂层中的纳米SiO2含量和热处理温度对涂覆铝合金的耐蚀性能有不同影响,当纳米SiO2含量为0.1%、热处理温度为130 ℃时,制备的杂化涂层性能最佳,在3.5%NaCl溶液中的腐蚀电流密度约为3.613×10-7 A/cm2,这一数值相对于铝合金基体的腐蚀电流密度4.208×10-5 A/cm2降低了2个数量级,显示出涂层对铝合金基体具有较好的防护效果.
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