【摘要】 以甲基三乙氧基硅烷(MTES)和二甲基二甲氧基硅烷(DMOS)为有机前驱体,以碱性硅溶胶(CS)为无机相,采用溶胶-凝胶法在铝合金基体表面制备有机-无机复合涂层。通过改变MTES与CS的质量比来改变体系中硅氧烷与硅溶胶的配比,研究有机物与无机相的比例对涂层结构与性能的影响。结果表明:涂层为有机-无机复合结构;体系中硅氧烷的比例较小时,涂层表面平整,涂层较薄;随体系中硅氧烷比例增加,涂层的疏水性能、力学性能以及耐腐蚀性能先上升后下降,在m(MTES)/m(CS)为50%,固化温度为100~120℃时涂层的性能最好,疏水角为102°,硬度为5H,附着力级别为0,涂层具有较好的耐腐蚀性能。更多还原

【Abstract】 The organic-inorganic composite coating on the aluminum alloy surface was prepared by sol-gel method using methyltriethoxysilane(MTES) and dimethyl dimethoxy silicane(DMOS) as organic precursor, and alkaline silica sol as inorganic phase. The effects of ratio of organic to inorganic on the structure and properties of the coatings were studied by changing the proportions of siloxane to silica sol(the quality of MTES to CS). The results show that the coating is a composite structure of organic-inorganic. The coating is smooth and thin when the siloxane has the low proportion. With increasing siloxane content, the hydrophobic property, mechanical properties and corrosion resistance of coating all increase first and then decrease. The optimal properties with hydrophobic angle of 102°, hardness of 5 H, adhesion grade of 0 and better corrosion resistance can be obtained when the proportions of siloxane to silica sol is 50% and the curing temperature is 100~120 ℃.更多还原