铝合金上锂盐抗蚀层的研究

Study of lithium anticorrosive film on aluminum alloy

由于铬酸盐对环境的毒害 ,铝合金表面耐蚀处理采用锂盐转化膜代替铬酸盐转化膜。本文介绍了铝合金上制备锂盐抗蚀层的工艺过程。利用电化学阻抗频谱技术 ,结合XPS、SEM等表面分析技术来表征和评价抗蚀层在氯化钠溶液中的耐蚀性能及孔蚀的发生。采用破损函数D =log (Z0 /Zt) 0 .1Hz来表征抗蚀性能随时间的衰退变化。

Due to environmental toxicity of chromating, it was superseded by lithium conversion treatment. This paper described preparation process of lithium anticorrosive film on aluminum alloy. Electrochemical impedance frequency spectrum, accordinated with XPS, SEM surface analysis technique, was used to express and evaluate corrosion resistance of lithium conversion film and formation of pitting in sodium chloride solutions. Pavage function D=Log (Z 0/Z t) 0.1Hz was also used to evaluate variation of anticorrosion performance with time.