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 language | English |
|---|---|
| Pages (from-to) | 277-284 |
| Number of pages | 8 |
| Journal | Corrosion |
| Volume | 63 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 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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Cite this
Daigo, Y., Watanabe, Y., & Sue, K. (2007). Effect of chromium ion from autoclave material on corrosion behavior of nickel-based alloys in supercritical water. Corrosion, 63(3), 277-284. https://doi.org/10.5006/1.3278354