CORROSION BEHAVIOR OF PURE CHROMIUM IN H2SO4 SOLUTIONS

被引：0

作者：

KATO, M ^{[1
]}

SAKAKI, T ^{[1
]}

机构：

[1] TOSOH CORP, CHEM RES LAB, YAMAGUCHI, JAPAN

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 1992年 / 56卷 / 01期

关键词：

CORROSION; CHROMIUM; H2SO4; ELECTROCHEMICAL PROPERTY; REPASSIVATION; CORROSION RATE;

D O I：

10.2320/jinstmet1952.56.1_67

中图分类号：

学科分类号：

摘要：

The corrosion behaviour of 99.83% pure Cr in H2SO4 solutions was investigated by corrosion rate and electrochemical measurements. Particular attention was given to effects of concentrations and temperature of acids. Cr exhibited much better corrosion resistance in 50%H2SO4 than that for Fe-Cr alloys and Ti at low temperatures up to 350 K. A wide passive potential range with low passive current densities was observed for Cr. The corrosion potential for Cr was nobler and more stable than those for Fe-Cr alloys and Ti. The high corrosion resistance is based on spontaneous passivation due to high stability of air formed oxide film. Cr was, however, severely corroded similarly to Fe-Cr alloy and Ti under high temperature conditions higher than 350 K. The corrosion potential shifted to less noble side as a result of depassivation, and then active dissolution of Cr occurred continuously.

引用

页码：67 / 73

页数：7