Effects of oxygen concentration on corrosion behavior of alloys in Acidic supercritical water

Yutaka Watanabe, Kazuhiro Shoji, Tadafumi Adschiri, Kiwamu Sue

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Corrosion properties were investigated on stainless steels and Ni-base alloys in supercritical water containing 0.01mol/kg-H2SO4 at 400°C/30MPa and 400°C/60MPa as a function of oxygen concentration ranging from 3ppb to 800ppm. Corrosion rates and compositions of oxide scales indicated that Cr was basically the key element for corrosion resistance of the alloys in the testing environments. However, Fe became another major contributor to corrosion resistance when oxygen concentration of the environment was increased up to 800ppm. Oxide stability of Cr, Fe, and Ni estimated as potential-pH diagram is in good agreement with the experimental results.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume2002-April
Publication statusPublished - 2002
EventCorrosion 2002 - Denver, United States
Duration: 2002 Apr 72002 Apr 11

Keywords

  • Austenitic stainless steel
  • Ni-base alloy
  • Oxide scale
  • Oxygen concentration
  • Phase stability
  • Sulfuric acid
  • Supercritical water

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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