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Journal of Solid State Electrochemistry

, Volume 23, Issue 10, pp 2793–2801 | Cite as

Pitting corrosion resistance of sensitized type 2205 duplex stainless steel in hot concentrated seawater

  • Hongtao Zeng
  • Yong Yang
  • Ronghai Xu
  • Sensen Xin
  • Moucheng LiEmail author
Original Paper
  • 350 Downloads

Abstract

Pitting corrosion resistance of 2205 duplex stainless steel aged at 850 °C was investigated in the hot concentrated seawater (i.e., the simulated low-temperature multi-effect distillation environment) by optical microscopy (OM), scanning electronic microscopy (SEM), and electrochemical measurement techniques. The precipitation of the σ phase leads to sensitization in the specimens during the aging treatment. The degree of sensitization (DOS) presents a maximum value with the change of σ phase content. The pitting corrosion resistance of the specimens degrades markedly in the presence of very weak sensitization. The pitting potential decreases almost linearly with the logarithm of DOS. The pit propagation mainly takes place along the Cr-depleted region around the σ phase. The repassivation ability of the specimens changes insignificantly with the aging time.

Keywords

Sensitization Duplex stainless steel Pitting corrosion σ phase Hot concentrated seawater 

Notes

Funding information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51571139 and U1960103).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Materials, School of Materials Science and EngineeringShanghai UniversityShanghaiChina

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