690合金在高温高压水蒸气与纯水中的短期氧化行为

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (6): 562-568.

690合金在高温高压水蒸气与纯水中的短期氧化行为

黄发¹,王俭秋²,韩恩厚³,柯伟²

1. 中科院金属所
2. 中国科学院金属研究所
3. 中国科学院金属研究所腐蚀与防护国家重点实验室

收稿日期:2011-03-31 修回日期:2011-05-10 出版日期:2012-06-28 发布日期:2012-07-02
通讯作者: 王俭秋
基金资助:
国家重点基础研究专项基金;自然科学基金

Short-time Oxidation of Alloy 690 in High-temperature and High-pressure Steam and Water

F. Huang, J.Q. Wang, E.H. Han, W. Ke

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2011-03-31 Revised:2011-05-10 Online:2012-06-28 Published:2012-07-02
Contact: J.Q. Wang
Supported by:
the Special Funds for the Major State Basic Research Projects (G2011CB610502) and the National Natural Science Foundation of China (No. 51025104)

摘要/Abstract

摘要： 用SEM、AFM与XPS研究了核电用690合金在高温高压水蒸气与纯水环境中的氧化行为。在280oC下氧化1h，690合金表面生成了较薄的氧化膜。在高温高压水蒸气环境中，氧化膜的最外层为氢氧化物且富Ni，中间层为氢氧化物与氧化物且富Cr，内层主要为NiO、Cr2O3与金属单质，金属/氧化物界面处仅存在Cr2O3。在高温高压水中，690合金表面的氧化膜与蒸汽中的结构相似，但由于溶解作用，最外层未检测到完整的氢氧化物层。本文还对比研究了不同表面处理状态对690合金氧化行为的影响，结果表明，随着试样表面粗糙度的增加，690合金表面的氧化膜厚度增加。原始态试样表面的等效氧化膜厚度为100-200 nm，砂纸打磨至400# 的试样表面等效氧化膜厚度为150-250 nm，砂纸打磨至1500#、机械抛光与电解抛光的试样表面等效氧化厚度为10-20 nm。

Abstract: The oxidation behavior of alloy 690 exposed to high-temperature and high-pressure steam and water at 280 °C for 1 h was investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). In high-temperature and high-pressure steam, the oxide film is composed of an outermost Ni-rich hydroxides layer, an intermediate layer of hydroxides and oxides enriched in Cr, an inner oxide layer. The film formed in high-temperature water is similar to that in steam, except for missing the Ni-rich hydroxides layer. Samples with different surface finishes (electropolished, mechanically polished, ground, and as-received) were prepared for comparison. A general increase of the oxide thickness with the degree of surface roughness is observed. The equivalent oxide thicknesses lie in the range of 100{200 nm for the as-received samples, 150{250 nm for the samples ground to 400# and 10−20 nm for the samples ground to 1500#, mechanically polished, and electropolished.

Key words: Alloy 690, Oxidation, High-temperature water, Surface finish, X-ray photoelectron spectroscopy (XPS)

黄发王俭秋韩恩厚柯伟. 690合金在高温高压水蒸气与纯水中的短期氧化行为[J]. J. Mater. Sci. Technol., 2012, 28(6): 562-568.

F. Huang, J.Q. Wang, E.H. Han, W. Ke. Short-time Oxidation of Alloy 690 in High-temperature and High-pressure Steam and Water[J]. J Mater Sci Technol, 2012, 28(6): 562-568.

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