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以巯基丙基三甲氧基硅烷(MPTMS)为有机前驱体,以正硅酸四乙酯(TEOS)为无机前驱体,盐酸为催化剂,经水解-缩合反应在Cu合金H62表面制备了高固含量的有机-无机杂化溶胶-凝胶涂层。利用红外光谱仪、动态光散射粒度分析仪对涂层的化学成分和溶胶粒子的平均直径进行表征,利用SEM观察涂层的表面和截面形貌,利用拉脱法附着力测试仪和电化学工作站对涂层的附着力和耐蚀性进行表征。结果表明:TEOS的加入有利于提高涂层的热稳定性。随着TEOS含量的增加,溶胶粒子的尺寸呈上升趋势,过量的TEOS会使涂层表面和内部产生孔洞和裂纹等缺陷。当TEOS和MPTMS的摩尔比为0.6时,涂层的交联密度较大且涂层缺陷较少,涂层的耐蚀性最佳。
Using mercaptopropyltrimethoxysilane (MPTMS) as an organic precursor and tetraethylammonium orthosilicate (TEOS) as an inorganic precursor and hydrochloric acid as a catalyst, a high solid content Organic-inorganic hybrid sol-gel coating. The chemical composition and the average diameter of the sol particles were characterized by using an infrared spectrometer and a dynamic light scattering particle size analyzer. The surface and cross-sectional morphology of the coating were observed by SEM. The tensile test was performed by using the pull-off adhesion tester and the electrochemical workstation Layer adhesion and corrosion resistance were characterized. The results show that the addition of TEOS can improve the thermal stability of the coating. With the increase of TEOS content, the size of sol particles tends to increase. Excess TEOS can cause holes and cracks on the surface and inside of the coating. When the molar ratio of TEOS to MPTMS is 0.6, the coating has higher crosslink density and less coating defects, and the corrosion resistance of the coating is the best.