室温下2205双相不锈钢点蚀和全面腐蚀高通量检测

周奕骐; SultanMahmood; DirkLars Engelberg

doi:10.1007/s12613-023-2651-4

Volume 30 Issue 12

Dec. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(12): 2375-2385

Yiqi Zhou, Sultan Mahmood, and Dirk Lars Engelberg, High throughput screening of localised and general corrosion in type 2205 duplex stainless steel at ambient temperature, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2375-2385. https://doi.org/10.1007/s12613-023-2651-4

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Yiqi Zhou, Sultan Mahmood, and Dirk Lars Engelberg, High throughput screening of localised and general corrosion in type 2205 duplex stainless steel at ambient temperature, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2375-2385. https://doi.org/10.1007/s12613-023-2651-4

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研究论文

室温下2205双相不锈钢点蚀和全面腐蚀高通量检测

1)
北京科技大学先进材料与技术研究所，北京材料基因组工程先进创新中心，北京 100083，中国
2)
Metallurgy and Corrosion, School of Materials, The University of Manchester, M13 9PL, Manchester, UK
3)
Materials Performance Centre, The University of Manchester, M13 9PL, Manchester, UK

通讯作者:
周奕骐 E-mail: ustbyiqizhou@ustb.edu.cn

文章亮点

(1) 双极性电化学可以在室温下能同时测试2205双相不锈钢的点蚀、缝隙腐蚀和全面腐蚀。

(2) 双极性电化学评估了双相不锈钢中点蚀的萌生、生长以及缝隙腐蚀的发展。

(3) 临界点蚀和缝隙腐蚀电位与电化学实验时间有关。

(4) 对奥氏体和铁素体之间选择性腐蚀的演变进行了讨论。

中文摘要

双极性电化学可以在测试样品上产生梯度电势，使得同一块样品上不同位置同时产生阳极和阴极反应，可以用于测试各类型腐蚀在不同电位条件下萌生和生长机理。在室温条件下，在单块2205双相不锈钢样品上测试到点蚀、缝隙腐蚀和全面腐蚀。当亚稳态点蚀的深度在10–20 μm并且外界电位在 +0.9 至 +1.2 V vs. OCP 的条件下，亚稳态点蚀发展为稳态点蚀的几率为 55%–75%。所有点蚀萌生在铁素体相内或奥氏体与铁素体间界面处。实验结果发现，临界点蚀和缝隙腐蚀的电位与实验时间有关，临界点蚀/缝隙腐蚀电位在150秒后的分别为0.87 V vs. OCP 和 0.80 V vs. OCP ，但是当实验时间增加到900秒时，临界点蚀/缝隙腐蚀电位下降到 0.84 V vs. OCP 和 0.76 V vs. OCP。本文讨论在不同电位和实验时间条件下，点蚀和缝隙腐蚀在双相不锈钢中生长机理的变化。同时发现，在全面腐蚀区域中，铁素体溶解速度快于奥氏体。

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Research Article

High throughput screening of localised and general corrosion in type 2205 duplex stainless steel at ambient temperature

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Abstract

Abstract

Bipolar electrochemistry is used to produce a linear potential gradient across a bipolar electrode (BPE), providing direct access to the anodic and cathodic reactions under a wide range of applied potentials. The occurrence of pitting corrosion, crevice corrosion, and general corrosion on type 2205 duplex stainless steel (DSS 2205) BPE has been observed at room temperature. The critical pit depth of 10–20 μm with a 55%–75% probability of pits developing into stable pits at potential from +0.9 to +1.2 V vs. OCP (open circuit potential) are measured. All pit nucleation sites are either within ferritic grains or at the interface between austenite and ferrite. The critical conditions for pitting and crevice corrosion are discussed with E_pit (critical pitting potential) and E_cre (critical crevice potential) decreasing from 0.87 and 0.80 V vs. OCP after 150 s of exposure to 0.84 and 0.76 V vs. OCP after 900 s of exposure, respectively. Pit growth kinetics under different applied bipolar potentials and exposure times have been obtained. The ferrite is shown to be more susceptible to general dissolution.
- bipolar electrochemistry;
- duplex stainless steel;
- pitting corrosion;
- pit growth factor;
- crevice corrosion

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