Corrosion mitigation in supercritical water with chromium ion

Y. Daigo, Y. Watanabe, K. Sue

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

It was reported that the chromium ion originated from the autoclave material (Ni-44Cr-1Mo) deposited on the specimen surface as chromium oxyhydroxide (CrOOH), and the protective chromium oxide layer mitigated corrosion od the alloys tested in supercritical water containing sulfuric acid (H2SO4). Based on the report, three kinds of tests were conducted at 400°C and 30 MPa in 0.01 mol/kg H2SO4 aqueous solution containing Cr3+ or Cr6+. Corrosion resistance of the specimens became 1.5 - 7.5 times better than specimens without chromium ions, because chromium ions from the aqueous solution was incorporated into the protective chromium oxide on the specimen. It was revealed that reduction of Ce6+ to Cr2O3 (Cr3+) occurred on the specimen surface and in the autoclave. The chemical equations of chromium oxide or chromium oxyhydroxide scale formed on the specimen surface were evaluated.

Original languageEnglish
Pages (from-to)1085-1093
Number of pages9
JournalCorrosion
Volume63
Issue number12
DOIs
Publication statusPublished - 2007 Dec

Keywords

  • Chromium ion
  • Chromium oxide
  • Corrosion mitigation
  • Deposition
  • Oxide scale
  • Solubility of oxide
  • Supercritical water

ASJC Scopus subject areas

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

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