Effect of chromium ion from autoclave material on corrosion behavior of nickel-based alloys in supercritical water

Y. Daigo, Y. Watanabe, K. Sue

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Seven kinds of corrosion tests were carried out on thirteen kinds of nickel-based alloys in subcritical and supercritical water containing 0.01 mol/kg sulfuric acid (H2 SO4) and 800 ppm oxygen (O2) using a Ni-44Cr-1Mo autoclave. The obtained corrosion rates were significantly lower than the previous experiments performed under the same conditions using a titanium autoclave. A compact oxide scale was found on the specimens tested in the Ni-44Cr-1Mo autoclave. The chromium-rich oxide layer would originate from the autoclave material and provide a protective function against corrosion. The corrosion retardation phenomenon has been explained by dependencies of chromia (Cr2O3) solubility on the phase state of water and temperature.

Original languageEnglish
Pages (from-to)277-284
Number of pages8
JournalCorrosion
Volume63
Issue number3
DOIs
Publication statusPublished - 2007 Mar

Keywords

  • Chromium ion
  • Chromium oxide
  • Deposition
  • Nickel-based alloy
  • Oxide scale
  • Solubility of oxide
  • Supercritical water

ASJC Scopus subject areas

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

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