Galvanic corrosion between the constituent phases in duplex stainless steel

Wen Ta Tsai, Jhen Rong Chen

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176 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3659-3668
Number of pages10
JournalCorrosion Science
Volume49
Issue number9
DOIs
Publication statusPublished - 2007 Sept

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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