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

doi:10.11949/0438-1157.20190153

Abstract

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.

Key words: atmospheric corrosion, electrochemical noise, electrochemical sensor, on-line corrosion monitoring, pitting initiation

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。

关键词: 大气腐蚀, 电化学噪声, 电化学传感器, 在线监检测, 孔蚀萌生

CLC Number:

TG 174.21

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

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.

Figures/Tables 10

Table 1 Chemical composition of T91 steel/%(mass)

C	Mo	V	Mn	Cr	Ni	Si	Nb	Fe
0.10	0.89	0.20	0.40	8.90	0.12	0.24	0.08	89.07

Fig.1 EN data of T91 probe under 90%RH condition containing Cl-

Fig.2 EN data of T91 probe under distilled water spay (100%RH)

Fig.3 EN data of T91 probe under 100%RH condition containing Cl-

Fig.4 EIS results of T91 probe

Fig.5 Impedance module value at 100 kHz indicating value of solution resistance

Fig.6 Equivalent circuits of electrochemical system using three nominally identical electrodes

Fig.7 EN treatment results of T91 probe in different environments

Fig.8 Correlation between Bode plots and spectral noise resistance under 100%RH condition without Cl-

Fig.9 Correlation between Bode plots and spectral noise resistance under 100%RH condition containing Cl-

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