镁合金表面稀土铈盐转化膜的制备与耐蚀性能

发布时间：2018-09-03 13:18

【摘要】：目的在镁合金表面制备稀土铈盐转化膜,以改善镁合金的耐蚀性能。方法利用化学转化技术在镁合金表面制备出稀土铈盐转化膜,进而采用SEM、EDAX及电化学测试技术等系统研究铈盐浓度、添加剂含量、转化时间和转化温度对转化膜形貌、成分和耐蚀性能的影响。结果稀土铈盐转化膜呈金黄色,由Mg、Ce和O组成,表面存在网状裂纹。转化膜的耐蚀性随铈盐浓度、添加剂含量、转化温度、转化时间的增加呈现先增加后降低的变化规律。结论稀土铈盐转化膜由Mg和Ce的氢氧化物和氧化物组成。铈盐转化膜的最佳工艺条件为:Ce(NO3)3质量浓度10~15 g/L,H2O2添加含量25~50 m L/L,转化温度40℃,转化时间30 min。经稀土铈盐转化处理后,镁合金的耐蚀性能得到了明显的改善。
[Abstract]:Aim to improve the corrosion resistance of magnesium alloy by preparing rare earth cerium salt conversion film on the surface of magnesium alloy. Methods rare earth cerium salt conversion films were prepared on magnesium alloy surface by chemical conversion technology. The morphology of the conversion films was studied by SEM,EDAX and electrochemical measurement techniques such as the concentration of cerium salt, the content of additives, the conversion time and the transformation temperature. Effect of composition and corrosion resistance. Results the conversion film of rare earth cerium salt was golden yellow and consisted of Mg,Ce and O, and there were netted cracks on the surface. The corrosion resistance of the conversion film increased first and then decreased with the increase of the concentration of cerium salt, the content of additives, the conversion temperature and the conversion time. Conclusion rare earth cerium salt conversion film is composed of hydroxides and oxides of Mg and Ce. The optimum technological conditions of cerium salt conversion film are as follows: mass concentration of 10: ce (NO3) 3 1015 g / L H _ 2O _ 2 25 ~ 50 mL 路L ~ (-1), conversion temperature 40 鈩，

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