中南大学学报（自然科学版）2011，Vol.42Issue(11)：3256-3261,6.
镁合金表面复合膜的制备及其耐蚀性
Preparation and corrosion resistance of composite coatings on magnesium alloy
摘要
Abstract
Composite coatings consisted of a MAO layer and a sol-gel layer were obtained on a magnesium alloy by micro-arc oxidation (MAO) and sol-gel technique. The surface morphologies and composition of the MAO coating and the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Potentiodynamic polarization curves were used to investigate the electrochemical properties of the composite coatings formed under different conditions. The results show that the optimum conditions are obtained as follows. Coated frequency is 3 times, soak time is 1 min, drying temperature is controlled within 80-100 ℃, drying time is 8 h, curing temperature and curing time are 170 V and 1 h, respectively. SiO2 sol-gel film could effectively seal micropores in the MAO coating. The composite coatings are more uniform and compact than the MAO coating. The polarization result shows that the composite coatings have more positive corrosion potential (Ecorr), lower corrosion current density (w), and higher linear polarization resistance (Rp) than the MAO coating and magnesium alloy substrate, indicating that the sol-gel coating formed on the magnesium alloy with MAO coating under the optimum conditions has better corrosion resistance. The composite coatings have good protection to magnesium alloy AZ91D.关键词
镁合金/微弧氧化/SiO2溶胶/复合膜层/耐蚀性Key words
magnesium alloy/ micro-arc oxidation/ SiO2 sol/ composite coatings/ corrosion resistance分类
化学化工引用本文复制引用
尚伟,陈白珍,石西昌,温玉清,黄安生..镁合金表面复合膜的制备及其耐蚀性[J].中南大学学报（自然科学版）,2011,42(11):3256-3261,6.基金项目
国家科技支撑计划项目(2006BAB09B04) （2006BAB09B04）
广西教育厅资助项目(200911MS110) （200911MS110）
