超级奥氏体不锈钢在模拟烟气脱硫冷凝液中的钝化行为研究

doi:10.11902/1005.4537.2022.107

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 408-414 CSTR: 32134.14.1005.4537.2022.107 DOI: 10.11902/1005.4537.2022.107

研究报告

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超级奥氏体不锈钢在模拟烟气脱硫冷凝液中的钝化行为研究

贺志豪¹^,², 贾建文¹^,², 李阳³, 张威³, 徐芳泓³, 侯利锋¹^,²(

), 卫英慧¹^,²

^1.太原理工大学材料科学与工程学院太原 030024
^2.山西省金属材料腐蚀与防护工程技术研究中心太原 030024
^3.太原钢铁 (集团) 有限公司先进不锈钢材料国家重点实验室太原 030003

Passivation Behavior of Super Austenitic Stainless Steels in Simulated Flue Gas Desulfurization Condensate

HE Zhihao¹^,², JIA Jianwen¹^,², LI Yang³, ZHANG Wei³, XU Fanghong³, HOU Lifeng¹^,²(

), WEI Yinghui¹^,²

^1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Shanxi Engineering Research Center for Corrosion & Protection, Taiyuan 030024, China
^3.State Key Laboratory of Advanced Stainless Steel, Taiyuan Iron and Steel (Group) Co. Ltd., Taiyuan 030003, China

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摘要:

采用动电位极化、恒电位极化、Mott-Schottky以及XPS测试研究了254SMo、904L、316L 3种奥氏体不锈钢在模拟烟气冷凝液中的钝化行为。结果表明，在模拟烟气冷凝液中，随着Mo含量的增加，钝化区变宽，点蚀电位变正，维钝电流密度降低，使得254SMo钢耐蚀性增强，适用于烟气脱硫环境中。同时，随着冷凝液pH的增大，3种钢的平带电位负移，施主密度不断减小，表明其钝化膜的缺陷随着pH的增加而减少，耐蚀性增加。

关键词 ：超级奥氏体不锈钢, 烟气脱硫, 钝化行为

Abstract：

The passivation behavior of austenitic stainless steels 254SMo, 904L and 316L in a simulated flue gas desulfurization condensate was studied by potentiodynamic polarization, potentiostatic polarization, Mott-Schottky and XPS methods. The results show that, with the increase of Mo content, the passive region becomes larger, the pitting potential becomes more positive, and the passivation current density decreases for the steels. Among others, 254SMo steel exhibits the best corrosion resistance, which means that 254SMo steel is more suitable to be used in flue gas desulfurization environment. At the same time, with the increase of pH value of the simulated solution, the flat-band potential of the three steels all shifts negatively, and the value of the donor density would be decreased for their passivation film, indicating that the defects of the passivation film decreased, and the corrosion resistance would be increased.

Key words： super austenitic stainless steel FGD passivation behavior

收稿日期: 2022-04-12 32134.14.1005.4537.2022.107

ZTFLH:

TG174

基金资助:中央引导地方科技发展专项(YDZX20191400002094);山西省科技重大专项(20191102006)

作者简介: 贺志豪，男，1996年生，硕士生

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引用本文:

贺志豪, 贾建文, 李阳, 张威, 徐芳泓, 侯利锋, 卫英慧. 超级奥氏体不锈钢在模拟烟气脱硫冷凝液中的钝化行为研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 408-414.
Zhihao HE, Jianwen JIA, Yang LI, Wei ZHANG, Fanghong XU, Lifeng HOU, Yinghui WEI. Passivation Behavior of Super Austenitic Stainless Steels in Simulated Flue Gas Desulfurization Condensate. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 408-414.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.107 或 https://www.jcscp.org/CN/Y2023/V43/I2/408

表1 3种不锈钢的化学成分

图1 254SMo，904L和316L不锈钢分别在不同pH下以及在pH=3时的动电位极化曲线

图2 3种不锈钢在不同pH下的M-S曲线

图3 254SMo钢在不同pH下形成的钝化膜中O 1s的XPS谱图

表2 钝化膜施主密度ND和平带电位Efb(V)的值

图4 254SMo钢在pH=1和pH=3条件下形成的钝化膜中Cr 2p的XPS谱

图5 254SM不锈钢在pH=1和pH=3条件下形成的钝化膜中Fe 2p的XPS谱

图6 254SMo不锈钢在pH=1和3条件下形成的钝化膜中Mo 3d的XPS谱图

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