摘要
对ZM-5镁合金表面高锰酸盐转化膜、铈盐转化膜、高锰酸盐-铈盐转化膜的性能进行对比分析,并在3.5%Na Cl溶液中,对各膜层的耐腐蚀性能进行研究。结果表明,高锰酸盐膜、高锰酸盐-铈盐膜与基体结合力强,且具有很好的耐蚀性能。应用化学反应原理对高锰酸盐-铈盐成膜机制进行探讨,分析认为:通过微阳极和微阴极的电化学过程、氧化还原反应和沉淀反应过程,在镁合金表面形成Mg2+,Mn2+,Ce3+,Ce4+的氧化物与氢氧化物,KMn O4作为阴极去极化剂,加快了阴极还原反应,提高了成膜反应速度。
The anti - corrosion of conversion coating for magnesium alloy by a permanganate solution, cerium solution and a mixture solutioo of permanga- nate - cerium was studied in the paper with simulate the corrosion in 3.5 % NaCl solution. The results showed that the adhesion of permanganate, perman- ganate - cerium coating were better, and it had good corrosion resistance. The forming mechanism of permanganate - cerium coating was studied using the principle of chemical reaction. Through the electrochemical process of micro - anode and micro - cathode, oxidation reaction and precipitation reaction, there were oxides and hydroxides of Mg^2＋ , Mn^2＋, Ce^3 ＋ , Ce^4 ＋ on magnesium alloy surface. As a cathode depolarizer, KMnO4 accelerated cathode reaction and improved the speed of coating - forming reactions.
出处
《轻金属》
CSCD
北大核心
2015年第5期53-55,共3页
Light Metals
基金
国家自然科学基金资助项目(11204378)
关键词
铈盐
高锰酸盐
转化膜
耐蚀性能
cerium
permanganate
conversion coating
corrosion resistance
