Abstract
Supercritical water is recognized as a promising medium for various chemical processes. However, one of the major problems to industrial application of the processes is thought to be corrosion of structural materials. In this paper, dependencies of corrosion resistance on alloying elements were investigated on twelve kinds of nickel base alloys in 400°C30MPa and 400°C60MPa supercritical water containing O.Olmol/kg sulfuric acid. The investigations reveals that Cr controls the corrosion resistance of the alloys in the test conditions and thresholds of changes in improvement rate in corrosion resistance with increasing Cr content are observed for the testing pressures. Properties of oxide on the specimens are examined by X-ray diffraction technique (XRD) to investigate correlation between the corrosion resistance of the Ni base alloys and crystallinity of the oxides on the Ni base alloys. The investigation suggests that corrosion resistance of the alloys improve with higher oxide crystallinity. The reasons for the effect of crystallinity on corrosion resistance are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 74131-741313 |
| Number of pages | 667183 |
| Journal | NACE - International Corrosion Conference Series |
| Publication status | Published - 2007 Dec 1 |
| Event | Corrosion 2007 - Nashville, TN, United States Duration: 2007 Mar 11 → 2007 Mar 15 |
Keywords
- Chromium
- Corrosion
- Crystallinity of oxide
- Ni base alloy
- Sulfuric acid
- Supercritical water
- X-ray diffraction
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)