Sol-gel法镁合金表面制备SiO2涂层及其腐蚀性能研究
Preparation of SiO2 Coating on Mg Alloy Surface by Sol-gel Process and Its Corrosion Resistance
张丽丽, 姚 军, 袁小玉
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作者单位：(内蒙古工业大学 材料科学与工程学院, 内蒙古 呼和浩特 010051)
中文关键字：溶胶-凝胶； 镁合金； SiO2涂层； 耐腐蚀性
英文关键字：sol-gel; Mg alloy; SiO2 coating; corrosion resistance
中文摘要：利用有机醇盐水解法制备了SiO2溶胶，采用溶胶-凝胶法在AZ91D镁合金表面制备了SiO2涂层。通过SEM、XRD等分析技术对涂层表面结构和组织进行表征，并探讨了该涂层的耐腐蚀性能及涂覆次数对腐蚀性能的影响。结果表明：以正硅酸乙酯为原料、无水乙醇为溶剂、盐酸为催化剂，可制备出均匀透明的SiO2溶胶；3.5%NaCl水溶液浸泡腐蚀试验表明，SiO2涂层显著提高了镁合金表面的耐腐蚀性能。
英文摘要：SiO2 coating on the surface of AZ91D alloy was prepared using sol-gel method. The surface structure and microstructure of the coatings were described through SEM, XRD and other analytical techniques. The results show that a uniform, transparent SiO2 sol can be prepared using TEOS as raw materials, ethanol as solvent, hydrochloric acid as catalyst. The results of the test of 3.5% NaCl aqueous solution immersion show that the corrosion resistance of the substrate is greatly improved by SiO2 coating.