Pitting initiation of T91 steel in Cl<sup>-</sup> polluted atmosphere detected by electrochemical noise

XIA Dahai; MA Chao; SONG Shizhe

doi:10.11949/0438-1157.20190153

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Pitting initiation of T91 steel in Cl^- polluted atmosphere detected by electrochemical noise

Surface and interface engineering | 更新时间：2026-07-24

- Pitting initiation of T91 steel in Cl^- polluted atmosphere detected by electrochemical noise
- CIESC Journal Vol. 70, Issue 7, Pages: 2668-2674(2019)
- 作者机构：
  
  天津大学材料科学与工程学院，天津市材料复合与功能化重点实验室，天津 300354
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190153
  CLC： TG 174.21
- Received：26 February 2019，
  
  Revised：2019-04-15，
  
  Online First：24 July 2026，
  
  Published：05 July 2019
- 稿件说明：
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夏大海, 马超, 宋诗哲. Cl^-污染大气环境下T91钢孔蚀萌生的电化学噪声检测[J]. 化工学报, 2019, 70(7): 2668-2674 DOI: 10.11949/0438-1157.20190153.

XIA Dahai, MA Chao, SONG Shizhe. Pitting initiation of T91 steel in Cl^- polluted atmosphere detected by electrochemical noise[J]. CIESC Journal, 2019, 70(7): 2668-2674 DOI: 10.11949/0438-1157.20190153.
夏大海, 马超, 宋诗哲. Cl^-污染大气环境下T91钢孔蚀萌生的电化学噪声检测[J]. 化工学报, 2019, 70(7): 2668-2674 DOI: 10.11949/0438-1157.20190153. DOI：

XIA Dahai, MA Chao, SONG Shizhe. Pitting initiation of T91 steel in Cl^- polluted atmosphere detected by electrochemical noise[J]. CIESC Journal, 2019, 70(7): 2668-2674 DOI: 10.11949/0438-1157.20190153. DOI：

摘要

采用电化学噪声(EN)技术研究了T91马氏体耐热钢在Cl

污染大气环境下的电化学行为，并针对EN数据进行统计分析，得到表征腐蚀萌生和发展的特征参数。运用Thevenin等效电路模型得到统计参数与腐蚀速度之间的关系并用实验数据进行验证。实验结果表明，EN技术可以有效监测大气环境下T91钢的腐蚀过程，电流噪声幅值大小一定程度上反映了局部腐蚀萌生和发展过程。理论分析结果表明，溶液电阻可影响电位噪声和电流噪声的测量以及噪声电阻的计算结果，但只要溶液电阻值远小于工作电极的阻抗，其影响可以忽略。谱噪声电阻不等于研究电极的阻抗模值，二者之间存在一定的关系。实验数据的进一步分析证实了理论预测的正确性。

Abstract

The electrochemical behavior of T91 martensitic heat-resistant steel in Cl-contaminated atmosphere was studied by electrochemical noise (EN) technique. The statistical analysis of EN data was carried out to obtain the characteristic parameters of corrosion initiation and development. The atmospheric corrosion process is identified by using the standard deviation of electrochemical potential noise (EPN) and electrochemical current noise (ECN) together with noise resistance. Thevenin equivalent circuit is used to verify the correlation between statistical parameters and corrosion rate. Experimental results indicate that EN can be used to effectively monitor the atmospheric corrosion of T91 steel

the amplitude of current noise reflects the corrosion initiation and propagation. Theoretical analyses reveal that solution resistance can influence the measurement of potential noise and current noise

and the calculation of noise resistance. Spectral noise resistance is not equal to impedance module

and a relationship is derived. Experimental data further confirmed the theoretical predictions.

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references

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Related Author

XIA Dahai

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Related Institution

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⁰

Pitting initiation of T91 steel in Cl- polluted atmosphere detected by electrochemical noise

DOI：10.11949/0438-1157.20190153

摘要

Abstract

关键词

Keywords

references

Pitting initiation of T91 steel in Cl^- polluted atmosphere detected by electrochemical noise