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为了改善铝合金材料的耐腐蚀性能,研究了以正硅酸乙酯(TEOS)为主要原料,加入一定量的KH-550,并引入部分羟基化的多壁碳纳米管(MWCNTs-OH)进行复合,以冰乙酸为催化剂,采用溶胶-凝胶法在铝合金基体表面形成复合涂层。腐蚀电化学测试和扫描电镜分析结果表明,MWCNTs-OH的引入能够明显提高涂层的防护性能,并有效防止涂层开裂。考察了MWCNTs-OH含量和热处理温度对涂层性能的影响。结果表明:MWC-NTs-OH质量分数为0.04%、热处理温度为130℃时制备的涂层性能最佳,相应的试样在3.5 wt%NaCl溶液中的腐蚀电流密度约为3.056×10-8A/cm2,而同等实验条件下铝合金基体腐蚀电流密度为7.216×10-5A/cm2,涂层的存在使腐蚀速率降低了3个数量级,涂层对铝合金基体具有显著的防护效果。
In order to improve the corrosion resistance of aluminum alloy materials, TEOS was used as the main raw material, a certain amount of KH-550 was added and partially hydroxylated multiwalled carbon nanotubes (MWCNTs-OH) Composite, using glacial acetic acid as catalyst, a composite coating was formed on the surface of the aluminum alloy substrate by a sol-gel method. Electrochemical corrosion test and scanning electron microscopy analysis showed that the introduction of MWCNTs-OH can significantly improve the protective performance of the coating, and effectively prevent the coating from cracking. The effects of MWCNTs-OH content and heat treatment temperature on the properties of coatings were investigated. The results show that the best coating performance is obtained when the mass fraction of MWC-NTs-OH is 0.04% and the heat treatment temperature is 130 ℃. The corrosion current density of 3.5wt% NaCl solution is about 3.056 × 10-8A / cm2, while under the same experimental conditions, the corrosion current density of the aluminum alloy substrate is 7.216 × 10-5A / cm2, the corrosion rate is reduced by 3 orders of magnitude in the presence of the coating, and the coating has a significant protective effect on the aluminum alloy substrate.