Corrosion Mitigation in Supercritical Water with Chromium Ion
| Autor: | Yuzo Daigo, Kiwamu Sue, Yutaka Watanabe |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
inorganic chemicals
Materials science Aqueous solution Chromate conversion coating General Chemical Engineering Inorganic chemistry technology industry and agriculture chemistry.chemical_element Sulfuric acid General Chemistry Supercritical fluid Autoclave Corrosion chemistry.chemical_compound Chromium chemistry otorhinolaryngologic diseases General Materials Science Solubility |
| Zdroj: | CORROSION. 63:1085-1093 |
| ISSN: | 1938-159X 0010-9312 |
| DOI: | 10.5006/1.3278326 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|