Selective Corrosion in Duplex Stainless Steel

Authors

Wen-Ta TSAI, Dept.of Materials Science and Engineering Cheng Kung University Tainan, ChinaXiamen University, Xiamen 361005, China);
Kuen-Ming TSAI, Dept.of Materials Science and Engineering Cheng Kung University Tainan, ChinaXiamen University, Xiamen 361005, China);
Chang-jian LIN
Yan FU

Corresponding Author

Wen_Ta TSAI;
Chang_jian LIN

Abstract

In duplex stainless steel, the two constituent phases, namely ferritic (α)and austenitic(γ) phases, have different crystal structure and chemical composition. They may thus exhibit different corrosion resistances in aqueous environment. In this investigation, an electrochemical technique with spatial resolution was employed to measure the potential difference between these two constituent phases in 2205 duplex stainless steel. Image analyzing techniques were also used to examine the preferential corrosion between α and γ phases. The experimental results showed that ferrite had a higher potential than austenite in0.01 mol/L NaCl solution. In 2 mol/L H2SO4+x mol/L HCl solution, two distinct peaks appeared in the anodic polarization curve in the passive_to_active transition region. Preferential corrosion occurred in the ferrite phase at a lower anodic peak potential, while in austenite at a higher anodic peak potential.

DOI Link

https://doi.org/10.61558/2993-074X.1501

Publication Date

2003-05-28

Online Available Date

2003-05-28

Revised Date

2003-05-28

Received Date

2003-05-28

Recommended Citation

Wen-Ta TSAI, Kuen-Ming TSAI, Chang-jian LIN, Yan FU. Selective Corrosion in Duplex Stainless Steel[J]. Journal of Electrochemistry, 2003 , 9(2): 170-176.
DOI: 10.61558/2993-074X.1501
Available at: https://jelectrochem.xmu.edu.cn/journal/vol9/iss2/8

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