Selective corrosion in duplex stainless steel

Wen Ta Tsai, Kuen Ming Tsai, Changjijan Lin

研究成果: Conference article同行評審

摘要

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 in 0.01 M NaCl solution. In 2M H2SO4 + xM 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.

原文English
期刊NACE - International Corrosion Conference Series
2003-April
出版狀態Published - 2003
事件Corrosion 2003 - San Diego, United States
持續時間: 2003 四月 162003 四月 20

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)
  • 材料科學(全部)

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