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Journal of Chinese Society for Corrosion and protection  2021, Vol. 41 Issue (2): 226-232    DOI: 10.11902/1005.4537.2019.259
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Effect of Alternating Stress Frequency on Corrosion Electrochemical Behavior of E690 Steel in 3.5%NaCl Solution
ZHANG Teng, LIU Jing(), HUANG Feng, HU Qian, GE Fangyu
Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
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Abstract  

The corrosion behavior of E690 steel in 3.5% (mass fraction) NaCl solution by applied elastic alternating stresses of different frequencies (0.1, 0.5, 1.0, 1.3, 1.8 and 2.0 Hz) was studied by electrochemical test and surface characterization. Results show that there is a critical loading frequency for the applied alternating stress that divides the corrosion electrochemical behavior into two different regions. When loading frequency is below the critical frequency, the maximum strain rate of E690 steel and the number of active sites on steel surface increases with the increasing loading frequency. The corrosion process is mainly controlled by activation. The corrosion rate and the portion of localized corrosion area increase with the increase of the loading frequency. When loading frequency is higher than the critical frequency, the corrosion process is mainly controlled by diffusion. Hence, the loading frequency has little impact on the corrosion rate and localized corrosion area.

Key words:  alternating stress      loading frequency      E690 steel      electrochemical behavior     
Received:  16 December 2019     
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(51871172)
Corresponding Authors:  LIU Jing     E-mail:  liujing@wust.edu.cn
About author:  LIU Jing, E-mail: liujing@wust.edu.cn

Cite this article: 

ZHANG Teng, LIU Jing, HUANG Feng, HU Qian, GE Fangyu. Effect of Alternating Stress Frequency on Corrosion Electrochemical Behavior of E690 Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 226-232.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2019.259     OR     https://www.jcscp.org/EN/Y2021/V41/I2/226

Fig.1  Microstructure of E690 steel
Fig.2  Schematic illustrations of sample (a) and testing device (b) used in electrochemical experiment under alternating stress
Fig.3  Time dependences of the OCP of E690 steel in 3.5% NaCl solution under different loading frequencies
Fig.4  Icorr and Rp values of E690 steel under different loading frequencies in 3.5%NaCl solution
Fig.5  Polarization curves of E690 steel in 3.5%NaCl solution under different loading frequencies
Loading frequency / HzbamV·dec-1bcmV·dec-1IcorrmA·cm-2EcorrV
Free58.0-677.42.01×10-2-0.6522
0.170.1-383.12.17×10-2-0.6863
0.576.0-491.92.54×10-2-0.6641
1.084.6-545.53.60×10-2-0.6760
1.388.0-553.73.71×10-2-0.6426
1.884.1-835.23.66×10-2-0.5895
2.082.5-1039.53.87×10-2-0.6076
Table 1  Fitting parameters of polarization curves for E690 steel in 3.5%NaCl solution under different loading frequencies
Fig.6  Nyquist (a), phase angle (b) and impedance module (c) plots and the equivalent circuit (d) of E690 steel in 3.5%NaCl solution under different loading frequencies
Load frequency / HzRsΩ·cm2CeffμF·cm2Y0sn·Ω-1·cm-2nRctΩ·cm2
Free5.019428.991.296×10-30.75771555
0.13.87081.437.823×10-40.71951112
0.54.490128.037.352×10-40.7659883
1.04.688171.489.075×10-40.7664682
1.34.233251.361.075×10-30.7879734
1.84.340240.829.646×10-40.7980709
2.04.228149.417.033×10-40.7899710
Table 2  Fitting parameters of EIS of E690 steel in 3.5%NaCl solution under different loading frequencies
Fig.7  Surface morphologies of E690 steel after corrosion in 3.5%NaCl solution for 24 h under different load frequency conditions: (a) 0.1 Hz, (b) 0.5 Hz, (c) 1.0 Hz, (d) 1.3 Hz, (e) 1.8 Hz, (f) 2.0 Hz
Fig.8  Corrosion morphologies of E690 steel substrate after corrosion in 3.5%NaCl solution for 24 h under different loading frequencies: (a) 0.1 Hz, (b) 0.5 Hz, (c) 1.0 Hz, (d) 1.3 Hz, (e) 1.8 Hz, (f) 2.0 Hz
Fig.9  Schematic of the effect of loading frequency on corrosion rate and control procedure for E690 steel in 3.5%NaCl solution
Fig.10  Time dependences of alternating strain rate under different loading frequencies
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