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以四氯化钛为前驱体,去离子水为溶剂,盐酸为抑制剂,采用溶胶-凝胶法制得TiO2溶胶。采用浸渍-提拉技术在纯镁基体上制得TiO2薄膜,以提高纯镁基体的耐蚀性。通过正交实验,以电化学阻抗值作为评价标准,研究了热处理温度、涂层次数、溶胶浓度对试样耐腐蚀性的影响。结果表明,溶胶浓度为0.5%、涂层次数为3、热处理温度为100℃时得到的TiO2薄膜具有最好的耐蚀性。
TiO2 sol was prepared by sol - gel method using titanium tetrachloride as precursor, deionized water as solvent and hydrochloric acid as inhibitor. The TiO2 thin film was prepared on the pure magnesium matrix by impregnation-pulling technology to improve the corrosion resistance of the pure magnesium matrix. The effects of heat treatment temperature, coating times and sol concentration on the corrosion resistance of the samples were studied by orthogonal experiments and electrochemical impedance measurements. The results show that the TiO2 film with the sol concentration of 0.5%, the coating number of 3 and the heat treatment temperature of 100 ℃ have the best corrosion resistance.