Al/Si对镍基合金在超临界水中腐蚀行为的影响

doi:10.11902/1005.4537.2018.033

中国腐蚀与防护学报

2019, Vol. 39

Issue (1): 68-76 DOI: 10.11902/1005.4537.2018.033

研究报告

本期目录 | 过刊浏览

Al/Si对镍基合金在超临界水中腐蚀行为的影响

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金属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能源中心西安 710032
4. 东北大学材料科学与工程学院沈阳 110819

Effect of Al/Si Content on Corrosion of Ni-based Alloys in Supercritical Water

Dongbai XIE¹,Youyu ZHOU²,Jintao LU³,Wen WANG²(

),Shenglong ZHU²,Fuhui WANG⁴

1. Department of Forensic Science and Technology, 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4种不同Al/Si含量的Ni-Fe-Cr合金在700 ℃/25 MPa超临界水环境中的高温氧化行为，揭示了合金的氧化动力学、表面氧化膜组成及微观结构。结果表明，当Cr含量达到25% (质量分数) 时，Ni-Fe-Cr合金在超临界水中能够形成稳定的保护性Cr₂O₃膜，合金中Si含量的增加有助于保护性氧化膜的快速形成，而较低的Al含量无法提高保护性氧化膜的化学稳定性。

关键词 ：镍基合金, Al/Si含量, 超临界水, 高温氧化

Abstract：

The oxidation behavior of four Ni-Fe-xCr based alloys with different contents of Al/Si was studied in supercritical water at 700 ℃ under 25 MPa. Oxidation kinetics of the alloys was obtained after 200 h exposure. The surface oxide scales were characterized by SEM/EDS and XRD. The results showed that a protective chromia scale formed as the content of Cr increased up to 25% (mass fraction), which was stable during the test. The strengthening phase element-Si was beneficial to the quick formation of protective chromia scale, meanwhile the Al showed little effect on the stability of protective chromia scale.

Key words： Ni-based alloy Al/Si content supercritical water high temperature oxidation

收稿日期: 2018-03-19

ZTFLH:

TG172

基金资助:公安部科技强警基础工作专项(2017GABJC11);痕迹检验鉴定技术公安部重点实验室及西安热工研究院有限公司电站清洁燃烧国家工程研究中心

通讯作者: 王文 E-mail: wen@imr.ac.cn

Corresponding author: Wen WANG E-mail: wen@imr.ac.cn

作者简介: 谢冬柏，男，1973年生，博士

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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. Al/Si对镍基合金在超临界水中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2019, 39(1): 68-76.
Dongbai XIE, Youyu ZHOU, Jintao LU, Wen WANG, Shenglong ZHU, Fuhui WANG. Effect of Al/Si Content on Corrosion of Ni-based Alloys in Supercritical Water. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 68-76.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.033 或 https://www.jcscp.org/CN/Y2019/V39/I1/68

表1 4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 20Cr9Al，20Cr13Al，25Cr5Si和25Cr2Si试样在超临界水中氧化不同时间后的XRD谱

图3 20Cr9Al和20Cr13Al试样在超临界水中氧化25 h后的表面形貌及元素分布

图4 20Cr9Al和20Cr13Al试样在超临界水中氧化100 h后的表面形貌及元素分布

图5 25Cr5Si和25Cr2Si试样在超临界水中氧化25 h后的表面形貌及元素分布

图6 25Cr5Si和25Cr2Si试样在超临界水中氧化100 h后的表面形貌及元素分布

图7 20Cr9Al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8 20Cr13Al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9 25Cr5Si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10 25Cr2Si试样在超临界水中氧化50和200 h后的截面形貌

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