Cr对镍基合金在超临界水中氧化行为的影响研究

doi:10.11902/1005.4537.2017.160

中国腐蚀与防护学报

2018, Vol. 38

Issue (4): 358-364 DOI: 10.11902/1005.4537.2017.160

研究报告

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Cr对镍基合金在超临界水中氧化行为的影响研究

谢冬柏¹(

), 周游宇², 鲁金涛³, 王文², 朱圣龙², 王福会⁴

1 新疆警察学院刑事科学技术系乌鲁木齐 830011
2 中国科学院金属研究所腐蚀与防护实验室沈阳 110016
3 西安热工研究院有限公司国家能源清洁高效火力发电技术研发中心西安 710032
4 东北大学材料科学与工程学院沈阳 110819

Effect of Cr Content on Oxidation of Ni-based Alloy in Supercritical Water

Dongbai XIE¹(

), Youyu ZHOU², Jintao LU³, Wen WANG², Shenglong ZHU², Fuhui WANG⁴

1 Department of Forensic Science, Xinjiang Police College, Urumqi 830011, China
2 Laboratory of Corrosion and Protection, Institue of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 National Energy R&D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co., Ltd., Xi′an 710032, China;
4 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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摘要:

研究了3种Cr含量Ni-Fe-Cr合金在700 ℃/25 MPa纯水蒸汽环境中的氧化行为,重点分析了氧化动力学、氧化膜相组成及微观结构的变化规律。结果表明,随Cr含量的增加,合金在超临界水中的氧化增重持续降低,失稳氧化发生时间被延长,合金的抗氧化性能得到显著改善。在超临界水环境中,Cr₂O₃氧化膜更容易失效,维持保护性Cr₂O₃氧化膜稳定的临界Cr含量相比于干燥空气中的要高;Ni-Fe-Cr合金在超临界水中氧化时优先生成Cr₂O₃氧化膜,其中较低Cr含量的合金长期氧化后,在两层氧化膜界面处会形成较薄的富Ni氧化膜。

关键词 ：镍基合金, Cr含量, 超临界水, 高温氧化

Abstract：

The oxidation behavior of three Ni-Fe-Cr alloys with different contents of Cr was studied in supercritical water at 700 ℃ under 25 MPa. Oxidation kinetics was acquired by weighting samples at intervals. After oxidation, the surface and cross-sectional morphologies, and phase compositions of the oxide scales were investigated using SEM/EDS and XRD. The results showed that the high Cr-content enhances the oxidation resistance of Ni-Fe-Cr alloys in supercritical water, i.e. lowering the mass gains and postponing the onset of breakaway oxidation. In supercritical water, the critical concentration of Cr, needed for the formation as well as sustained and steady growth of the protective chromia scale on Ni-Cr-Fe alloys, is higher than that in air. And in supercritical water, the protective Cr-rich oxide scale forms after a short time exposure. However, this protective Cr-rich oxide scale transforms to non-protective scale more easily in the further oxidation process. As exposure time increases, a duplex oxide scale forms on the alloy with low Cr concentration, and Ni-rich oxide exists in between the two oxide layers.

Key words： Ni-based alloy Cr content supercritical water high temperature oxidation

收稿日期: 2017-10-04

ZTFLH:

TG172

基金资助:2017年公安部科技强警基础工作专项 (2017GABJC11),西安热工研究院有限公司国家能源清洁高效火力发电技术研究中心研究项目和江西省材料表面工程重点实验室开放课题

作者简介:

作者简介谢冬柏,男,1973年生,博士,副教授

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引用本文:

谢冬柏, 周游宇, 鲁金涛, 王文, 朱圣龙, 王福会. Cr对镍基合金在超临界水中氧化行为的影响研究[J]. 中国腐蚀与防护学报, 2018, 38(4): 358-364.
Dongbai XIE, Youyu ZHOU, Jintao LU, Wen WANG, Shenglong ZHU, Fuhui WANG. Effect of Cr Content on Oxidation of Ni-based Alloy in Supercritical Water. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 358-364.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.160 或 https://www.jcscp.org/CN/Y2018/V38/I4/358

表1 3种镍基合金的名义成分

图1 合金在超临界水中的氧化增重曲线

图2 25Cr和20Cr试样在超临界水中氧化25 h后的表面形貌及元素分布

图3 25Cr合金超临界水中氧化200 h后的截面形貌及元素线分布

图4 22Cr试样在超临界水中氧化50和200 h后的截面形貌及元素线分布

图5 20Cr试样在超临界水中氧化200 h后的截面形貌及元素线分布

图6 25Cr,22Cr和20Cr试样在超临界水中氧化不同时间后的XRD谱

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