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以正硅酸乙酯、钛酸正丁酯、硝酸铝和醋酸锌为前驱体,无水乙酸为催化剂,采用溶胶-凝胶法在不锈钢表面制备了SiO_2-TiO_2-Al_2O_3-ZnO复合涂层,并对涂层进行了耐NaCl溶液浸泡腐蚀试验。利用扫描电镜对镀层在NaCl溶液腐蚀环境中的腐蚀形貌进行观察。对复合涂层进行了差热分析(DTA)、失重分析(TG),以此确定复合涂层的最佳烧结温度,还对涂层进行了X射线衍射分析,以此确定复合涂层的成分。结果表明,涂层的最佳烧结温度800℃。通过优化涂层的烧结温度等工艺,制备的溶胶-凝胶复合涂层提高了不锈钢表面的耐腐蚀能力。
SiO 2 -TiO 2 -Al_2O_3-ZnO composite coatings were prepared on stainless steel by sol-gel method using tetraethyl orthosilicate, n-butyl titanate, aluminum nitrate and zinc acetate as precursors and anhydrous acetic acid as catalyst. And the coating was resistant to NaCl solution immersion corrosion test. The corrosion morphology of the coating in NaCl solution corrosive environment was observed by SEM. The composite coatings were subjected to differential thermal analysis (DTA) and weight loss analysis (TG) to determine the optimal sintering temperature of the composite coatings. X-ray diffraction analysis was also performed on the coatings to determine the composition of the composite coatings . The results show that the optimum sintering temperature of the coating is 800 ℃. By optimizing the sintering temperature of the coating and other processes, the prepared sol-gel composite coating improves the corrosion resistance of the stainless steel surface.