Effect of chromium ion from autoclave material on corrsion behavior of Ni base alloys in supercritical water

Yuzo Daigo, Yutaka Watanabe, Kiwamu Sue

Research output: Contribution to journalConference articlepeer-review

Abstract

Seven kinds of corrosion tests were carried out on thirteen kinds of Ni-base alloys in sub-critical and supercritical water containing 0.01mol/kg-H2SO4 and 800ppm-O2 using Ni-44Cr-1Mo autoclave. The obtained corrosion rates were significantly lower than the previous experiments done in the same conditions using a Ti autoclave. A compact oxide scale was found on the specimens tested in the Ni-44Cr-1Mo autoclave. The Cr-rich oxide layer would originate from the autoclave material and provide protective function against corrosion. The corrosion retardation phenomenon has been explained by dependencies of Cr2O3 solubility on phase state of water and temperature.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume2005-April
Publication statusPublished - 2005
EventCorrosion 2005 - Houston, United States
Duration: 2005 Apr 32005 Apr 7

Keywords

  • Chromium ion
  • Chromium oxide
  • Corrosion
  • Deposition
  • Ni-base alloy
  • Oxide scale
  • Solubility of oxide
  • Supercritical water

ASJC Scopus subject areas

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

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