4种耐蚀合金在超超临界锅炉烟气冷凝液中的腐蚀行为研究

doi:10.11902/1005.4537.2021.004

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 493-500 DOI: 10.11902/1005.4537.2021.004

研究报告

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4种耐蚀合金在超超临界锅炉烟气冷凝液中的腐蚀行为研究

赵康, 李晓琦, 王铭滔, 刘宇茜, 姜华伟, 杨启容, 王力伟(

)

青岛大学机电工程学院青岛 266071

Corrosion Behavior of Four Corrosion-resistant Alloys in Ultra-supercritical Boiler Flue Gas Condensate

ZHAO Kang, LI Xiaoqi, WANG Mingtao, LIU Yuxi, JIANG Huawei, YANG Qirong, WANG Liwei(

)

School of Electromechanic Engineering, QingDao University, Qingdao 266071, China

全文: PDF(4628 KB) HTML

摘要:

通过开路电位、动电位极化曲线、电化学阻抗谱以及XPS测试研究了316L、254SMo、C276和Inconel 740H 4种耐蚀合金在超超临界锅炉烟气冷凝液中的腐蚀行为。结果表明，4种耐蚀合金在所研究烟气冷凝液中均表现出钝化特性，但是由于合金元素及其含量的差异，环境中的酸根离子对表面钝化膜的破坏作用存在差异。其中254SMo钢由于相对较高的Cr、Ni、Mo含量表现出最优的钝化性能，其钝化电流密度明显低于其他3种合金，极化电阻也较高，钝化膜中较高的Cr，以及适量的Ni、Mo是提高钝化膜质量的关键因素。

关键词 ：耐蚀合金, 烟气冷凝液, 腐蚀, 钝化

Abstract：

The corrosion behavior of four anticorrosion alloys, including 316L stainless steel, 254SMo stainless steel, C276 alloy and Inconel 740H alloy, in an artificial flue-gas condensate of pH 1.09 which aims to simulate the flue-gas condensate of ultra-supercritical boilers, is studied by means of open-circuit potential- and potentiodynamic polarization curve-measurement, as well as electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. It shows that all the four alloys exhibit passivation characteristics in the artificial flue-gas condensate. The deterioration process of the formed passive films by the aggressive ions in the flue-gas condensate is different for the four alloys with individually unique chemical composition. Among them, the passivation current density is the lowest and the polarization resistance is the highest for 254SMo stainless steel, which may be ascribed to that the formed passive film of high quality contains high Cr content, and appropriate amount of Mo and Ni on 254SMo stainless steel.

Key words： corrosion-resistant alloy flue gas condensate corrosion passivation

收稿日期: 2021-01-09

ZTFLH:

TG172

基金资助:国家自然科学基金(51701102)

通讯作者: 王力伟 E-mail: ustbwangliwei@126.com

Corresponding author: WANG Liwei E-mail: ustbwangliwei@126.com

作者简介: 赵康，男，1996年生，硕士生

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引用本文:

赵康, 李晓琦, 王铭滔, 刘宇茜, 姜华伟, 杨启容, 王力伟. 4种耐蚀合金在超超临界锅炉烟气冷凝液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2021, 41(4): 493-500.
Kang ZHAO, Xiaoqi LI, Mingtao WANG, Yuxi LIU, Huawei JIANG, Qirong YANG, Liwei WANG. Corrosion Behavior of Four Corrosion-resistant Alloys in Ultra-supercritical Boiler Flue Gas Condensate. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 493-500.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.004 或 https://www.jcscp.org/CN/Y2021/V41/I4/493

表1 4种耐蚀合金的化学成分

图1 4种材料在模拟烟气冷凝液中的动电位极化曲线测试

图2 4种不同材料在模拟烟气冷凝液中的长周期开路电位

图3 4种材料在烟气冷凝液中浸泡24 h的EIS结果

表2 4种材料的阻抗拟合数据

图4 4种材料钝化膜中O 1s的XPS谱图

图5 4种材料钝化膜中Fe 2p3/2的XPS谱

图6 4种材料钝化膜中Cr 2p3/2的XPS谱图

图7 4种材料钝化膜中Mo 3d的XPS谱图

图8 4种材料钝化膜中Ni 2p3/2的XPS谱图

图9 钝化膜中不同元素比例图

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