Galvanic corrosion between the constituent phases in duplex stainless steel

被引：173
作者：
Tsai, Wen-Ta [1 ]
Chen, Jhen-Rong [1 ]
机构：
[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan
来源：
CORROSION SCIENCE | 2007年 / 49卷 / 09期
关键词：
duplex stainless steel; potentiostatic etching; acid corrosion; selective dissolution; galvanic corrosion;
D O I：
10.1016/j.corsci.2007.03.035
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The exclusive single-phase with the exact chemical composition of the constituent phase in 2205 duplex stainless steel (DSS) could be prepared using selective dissolution method. The respective electrochemical behavior of each constituent phase could then be measured. The experimental results showed that the two distinct peaks in the active-to-passive transition region of the polarization curve determined in 2 M H2SO4 + 0.5 M HCl mixed solution were actually corresponded to the respective anodic peaks of the single austenite and ferrite phases. A polarity reversion was found between austenite and ferrite phases in mixed H2SO4 + HCl solution and HNO3 solution. Galvanic current measurements also revealed that austenite was anode in HNO3 solution, but became cathode when exposed in 2 M H2SO4 + 0.5 M HCl mixed solution. (C) 2007 Elsevier Ltd. All rights reserved.
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页码：3659 / 3668
页数：10
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