ROLE OF IRON IN PITTING CORROSION OF ALUMINUM.

被引：0

作者：

Seri, Osami ^{[1
]}

Tagashira, Kohsuke ^{[1
]}

机构：

[1] Muroran Inst of Technology, Muroran, Jpn, Muroran Inst of Technology, Muroran, Jpn

来源：

Keikinzoku/Journal of Japan Institute of Light Metals | 1988年 / 38卷 / 01期

关键词：

CHEMICAL REACTIONS - Reduction - CORROSION - Electrochemical;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Pitting corrosion behaviors of Al-Fe alloys in 0. 1 M NaCl solution were investigated by measurement of corrosion potential and the pH value of bulk solution. The corrosion potential changes from minus 0. 6 V vs. Ag/AgCl in the early stage ( less than 100 h) to minus 0. 8 V in its late stage ( greater than 200 h). This shift of corrosion potential to less noble potential occurs due to the increase of Cl** minus ion concentration in the pit. The pH values of bulk solution changes from 5. 0 to 6. 0 approximately 6. 5 during the long range process. Iron which exists in the form of FeAl//3 plays not only a statistical role of cothodic site where the oxygen reduction occurs, but also a dynamic role in which iron in FeAl//3 changes chemical forms, e. g. ferrous iron, ferrous hydroxide and deposited iron in the later stage of corrosion process.

引用

页码：29 / 34