Corrosion mitigation in supercritical water with chromium ion

Yuzo Daigo, Yutaka Watanabe, Kiwamu Sue

Research output: Contribution to journalConference articlepeer-review


It was earlier reported that chromium ion originating from autoclave material (Ni-44Cr-lMo) deposited on the specimen surface as chromium oxide and the protective chromium oxide layer mitigated corrosion of almost all specimens in supercritical water containing sulfuric acid (H2SO4). Based on the report, three kinds of tests were conducted at 400°C and 30MPa in 0.01mol/kg H2SO4 solution containing Cr3+ or Cr +. Corrosion resistance of the specimens became 1.5 ∼ 7.5 times as good as that of specimens without ion because protective Cr oxide scale coming from solution was formed on the specimen surface. It was revealed that an electroless plating process took place when Cr6+ was present in the solution and Cr3+ deposited on the specimen surface and in the autoclave as Cr2O3 at the test conditions. The chemical equations of Cr compound scale formed on the specimen surface were presented.

Original languageEnglish
Pages (from-to)64521-645212
Number of pages580692
JournalNACE - International Corrosion Conference Series
Publication statusPublished - 2006
EventCorrosion 2006 - Orlando, FL, United States
Duration: 2006 Sept 102006 Sept 14


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

ASJC Scopus subject areas

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


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