Corrosion behavior of constituent metals of stainless alloys in scwo environments

N. Hara, S. Tanaka, K. Sugimoto

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

The corrosion behavior of pure Fe, Ni, Cr, Mo, and Ti has been examined in pure water and lmM-HCl solutions at 500°C and 29.4MPa. In pure water, these metals oxidized and their oxidation rates were in the following order: Fe> Ni> Ti> Mo≫ Cr. The oxidation kinetics of Fe, Ni and Ti obeyed the parabolic rate law. After corrosion tests in pure water, the metals were covered with adherent oxide films of Fe3O4, NiO, Cr2O3, MoO2, and TiO2 (rutile), respectively. Except for Ni, oxidation was a dominant corrosion process in deaerated lmM-HC1. When exposed to this solution for short times (<30h), Ni yielded a weight loss. Pure Fe had approximately the same oxidation rate as in pure water. The oxidation rates of Cr, Mo and Ti in deaerated lmM-HCI were higher than those observed in pure water, while the oxide films formed on the metals had essentially the same composition as those in pure water. The addition of H2O2 to HC1 solutions accelerated the corrosion of Fe, Ni, Cr, and Mo. The corrosion rate of Fe in lmM HCl + 0.6M H2O2 was approximately three times higher than that in deaerated lmM-HCl. In the oxidizing HCl solution, Ni showed the largest weight gain among the five metals examined, and Cr and Mo suffered from general corrosion, probably due to transpassive dissolution.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume2001-March
Publication statusPublished - 2001 Jan 1
EventCorrosion 2001 - Houston, United States
Duration: 2001 Mar 112001 Mar 16

Keywords

  • Chromium
  • Dissolution
  • Hydrochloric acid
  • Hydrogen peroxide
  • Iron
  • Molybdenum
  • Nickel
  • Oxidation
  • Pitting corrosion
  • Pure water
  • Supercritical water oxidation
  • Titanium
  • Transpassive dissolution.

ASJC Scopus subject areas

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

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