低合金耐热钢T23在高温超临界CO<sub>2</sub>环境中的腐蚀特性研究

doi:10.11902/1005.4537.2020.115

中国腐蚀与防护学报

2021, Vol. 41

Issue (3): 327-334 DOI: 10.11902/1005.4537.2020.115

研究报告

本期目录 | 过刊浏览

低合金耐热钢T23在高温超临界CO₂环境中的腐蚀特性研究

李瑞涛¹, 肖博¹, 刘晓¹, 朱忠亮¹, 程义², 李俊菀³, 曹杰玉³, 丁海民¹, 张乃强¹(

)

^1.华北电力大学电站能量传递转化及系统教育部重点实验室北京 102206
^2.哈尔滨锅炉有限公司高效清洁燃煤电站锅炉国家重点实验室哈尔滨 150046
^3.西安热工研究院有限公司西安 710054

Corrosion Behavior of Low Alloy Heat-resistant Steel T23 in High-temperature Supercritical Carbon Dioxide

LI Ruitao¹, XIAO Bo¹, LIU Xiao¹, ZHU Zhongliang¹, CHENG Yi², LI Junwan³, CAO Jieyu³, DING Haimin¹, ZHANG Naiqiang¹(

)

^1.Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, North China Electric Power University, Beijing 102206, China
^2.State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin Boiler Co. Ltd. , Harbin 150046, China
^3.Xi'an Thermal Power Research Institute Co. , Ltd, Xi'an 710054, China

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摘要:

通过低合金耐热钢T23在650 ℃/25 MPa的高温超临界二氧化碳 (s-CO₂) 下的1000 h氧化实验获得了T23钢的氧化动力学特性，并借助SEM、XRD及EDS对氧化膜的形貌、物相和成分进行了分析。结果表明：T23钢在650 ℃/25 MPa的高温s-CO₂中的氧化动力学符合立方规律，时间指数0.30。氧化膜具有典型的双层结构，外层氧化膜为Fe₃O₄且氧化膜疏松多孔，内层氧化膜较为致密含有大量尖晶石结构的Fe_3-_xCr_xO₄。T23材料在高温超临界CO₂环境中形成的氧化膜较容易发生剥落，剥落腐蚀现象明显。

关键词 ： T23钢, 高温氧化, 高温s-CO₂, 剥落腐蚀

Abstract：

The long term oxidation behavior of T23 steel, one of the low alloy heat resistant steels was examined in high-temperature supercritical CO₂ at 650 ℃/25 MPa for 1000 h, so that, the oxidation kinetics of T23 steel was acquired. Meanwhile, the oxide scales formed on the steel were characterized by SEM, XRD and EDS. The results showed that the oxidation kinetics of T23 steel oxidized in high-temperature s-CO₂ at 650 ℃/25 MPa followed the cubic law during the entire test duration. Meanwhile, the time index was also obtained by data analysis process and proved to be 0.30. The oxide scales formed on all the samples exposed for different time duration had a typical double-layered structure. Namely，the outer layer was porous and composed of Fe₃O₄. The inner layer composed of Fe_3-_xCr_xO₄ and was much denser than the outer layer. Also, the oxide scale formed on T23 steel in high-temperature s-CO₂was more likely to peel off and the exfoliation-like corrosion could be found obviously on the surface of the corroded steel.

Key words： T23 steel high-temperature oxidation high-temperature s-CO₂ exfoliated corrosion

收稿日期: 2020-07-08

ZTFLH:

TG178

基金资助:北京市科技计划(2017YFB0601804);北京市自然科学基金(2194085)

通讯作者: 张乃强 E-mail: zhnq@ncepu.edu.cn

Corresponding author: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

作者简介: 李瑞涛，男，1996年生，硕士

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引用本文:

李瑞涛, 肖博, 刘晓, 朱忠亮, 程义, 李俊菀, 曹杰玉, 丁海民, 张乃强. 低合金耐热钢T23在高温超临界CO₂环境中的腐蚀特性研究[J]. 中国腐蚀与防护学报, 2021, 41(3): 327-334.
Ruitao LI, Bo XIAO, Xiao LIU, Zhongliang ZHU, Yi CHENG, Junwan LI, Jieyu CAO, Haimin DING, Naiqiang ZHANG. Corrosion Behavior of Low Alloy Heat-resistant Steel T23 in High-temperature Supercritical Carbon Dioxide. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 327-334.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.115 或 https://www.jcscp.org/CN/Y2021/V41/I3/327

图1 高温s-CO2氧化试验平台结构示意图

图2 T23钢在650 °C/25 MPa高温s-CO2中的氧化增重曲线

图3 T23钢在650 ℃/25 MPa高温s-CO2中不同氧化时间后的表面形貌图

图4 氧化时长1000 h试样 (1#试样) 表面氧化皮剥落位置不同区域氧化物形貌

图5 氧化时长1000 h试样 (2#试样) 表面氧化皮剥落位置区域1的氧化物形貌

图6 图4a中氧化皮剥落形貌及区域面扫描结果

图7 T23钢在650 ℃/ 25 MPa高温s-CO2中氧化不同时间后的横截面形貌及对应的EDS线扫描结果

表1 不同氧化时长试样表面氧化膜厚度

图8 图6c所示区域EDS面扫描结果

图9 T23钢在650 ℃/25 MPa高温s-CO2中氧化不同时长后的XRD谱

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