Analyses of oxide films grown on Alloy 625 in oxidizing supercritical water
文献类型：期刊论文
| 作者 | M. C. Sun ; X. Q. Wu ; Z. E. Zhang ; E. H. Han |
| 刊名 | Journal of Supercritical Fluids
 |
| 出版日期 | 2008 |
| 卷号 | 47期号:2页码:309-317 |
| 关键词 | Alloy 625 SCWO Oxide film XPS TEM stress-corrosion cracking 316l stainless-steel temperature aqueous corrosion nickel-based alloys chloride solutions base alloys oxidation mechanism behavior xps |
| ISSN号 | 0896-8446 |
| 中文摘要 | Morphologies, microstructures and chemical composition of oxide films grown on Alloy 625 at 400 degrees C, 450 degrees C and 500 degrees C in oxidizing supercritical water containing 2.0% H2O2 were investigated using weight measurement, grazing incidence X-ray diffractometry, scanning electron microscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. It was found that the mass gain of the alloy in oxidizing supercritical water increased with exposure time. The smallest mass gain was obtained at 450 degrees C, agreeing well with the smallest oxide film thickness at this temperature. The average thickness of the oxide films was 1.28 mu m, 0.72 mu m and 1.42 mu m at 400 degrees C, 450 degrees C and 500 degrees C, respectively after 250h exposure. The size of oxide crystals on the alloy surface gradually grew with increasing exposure temperature. A discontinuous and thin Cr2O3 layer was formed at 400 degrees C in oxidizing supercritical water as a result of leaching of Cr3+ as Cr6+, while a continuous Cr2O3 layer was formed at 450 degrees C and 500 degrees C. Duplex oxide layer structure was observed at all three temperatures, which was identified to consist of Ni(OH)(2)/NiO/NiCr2O4/Cr2O3/Alloy 625 from outer to inner layer. The growth mechanism of oxide films on Alloy 625 in oxidizing supercritical water seems to be similar to that in high temperature water, namely the Ni(OH)(2)/NiO outer layer growth by dissolution and precipitation mechanism and the Cr2O3 inner layer formation by oxygen diffusing inward and reacting with the retained Cr. (C) 2008 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/33086]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | M. C. Sun,X. Q. Wu,Z. E. Zhang,et al. Analyses of oxide films grown on Alloy 625 in oxidizing supercritical water[J]. Journal of Supercritical Fluids,2008,47(2):309-317. |
| APA | M. C. Sun,X. Q. Wu,Z. E. Zhang,&E. H. Han.(2008).Analyses of oxide films grown on Alloy 625 in oxidizing supercritical water.Journal of Supercritical Fluids,47(2),309-317. |
| MLA | M. C. Sun,et al."Analyses of oxide films grown on Alloy 625 in oxidizing supercritical water".Journal of Supercritical Fluids 47.2(2008):309-317. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。