转化时间对AZ31B镁合金植酸转化膜的影响
Influence of Conversion Time on Phytic Acid Conversion Coating on AZ31B Magnesium Alloy
摘 要
采用析氢试验、Tafel分析方法及SEM、EDS对AZ31B镁合金在植酸溶液中不同时间所形成转化膜的性能、表面微观结构及成分进行了研究。结果表明，当转化时间较短时，转化膜的防腐蚀性能随着转化时间的增加而增加，并在转化时间为40 min时，其转化膜防腐蚀性能最佳; 随着转化时间的进一步增加，转化膜的防腐蚀性能随之下降。植酸转化膜含有镁,铝,锌,氧,磷元素,转化膜表面存在一定的裂纹，且裂纹处仍有很薄的一层植酸转化膜。此外，析氢试验、电化学试验及动力学分析表明，植酸转化试样相比于未处理试样，具有更好的防腐蚀性能。
转化时间
镁合金
转化膜
防腐蚀
phytic acid
conversion time
magnesium alloy
conversion coating
anticorrosion
Abstract
Phytic acid conversion samples were formed on AZ31B magnesium alloy at different times. The anticorrosive performance, morphology and composition of the conversion samples were studied by hydrogen evolution method, Tafel analysis, SEM and EDS. The results indicated that the conversion time had obvious influence on the properties of the phytic acid conversion coating. The anticorrosive performance of the samples increased with increasing the conversion time when the conversion time was short. When the conversion time was 40 min the conversion sample had the best anticorrosive performance. After this time, the anticorrosive performance of the samples reduced with the increase of conversion time. The main elements of the coating were Mg, Al, Zn, O and P. The conversion coating also had a few cracks, and a thin coating was formed on the crack. Furthermore, hydrogen evolution method, Tafel analysis and kinetics analysis showed that the phytic acid conversion sample had better corrosion resistance than untreated sample.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 重庆市教委科学技术研究项目(KJ120809)
收稿日期 2013/12/17
修改稿日期
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备注高焕方(1973-),教授,博士,从事材料腐蚀与防护的研究工作,
引用该论文: GAO Huan-fang,LONG Fei,TAN Huai-qin,HUANG Guo-wen,SUN Qiang,CHEN Han-lin. Influence of Conversion Time on Phytic Acid Conversion Coating on AZ31B Magnesium Alloy[J]. Corrosion & Protection, 2014, 35(11): 1108
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