Corrosion Mitigation in Supercritical Water with Chromium Ion

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 of the alloys tested in supercritical water containing sulfuric acid (H2SO4). Bas...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2007-12, Vol.63 (12), p.1085-1093
Main Authors: DAIGO, Y, WATANABE, Y, SUE, K
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous solutions
Autoclaving
Chromium
Chromium oxides
Corrosion
Corrosion environments
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Exact sciences and technology
Ions
Metals. Metallurgy
Mitigation
Scale (corrosion)
Sulfuric acid
Sulphuric acid
Trivalent chromium
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Summary: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 of 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 Cr6+ 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.
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3278326