Investigation of Electrochemical Noise in the Crevice Corrosion of Q235 Carbon Cteel

Authors

Qian HU, School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Hubei Key Laboratory of Materials Chemistry and Service Failure,Wuhan 430074,China;
Yu-bing QIU, School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Hubei Key Laboratory of Materials Chemistry and Service Failure,Wuhan 430074,China;
Xing-peng GUO, School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Hubei Key Laboratory of Materials Chemistry and Service Failure,Wuhan 430074,China;

Abstract

The crevice corrosion behavior of Q235 carbon steels in a NaHCO3+NaCl solution was investigated by electrochemical noise(EN) and electrochemical impedance spectroscopy(EIS).Three stages of crevice corrosion including the induction,the rapid transform and the stable development could be clearly distinguished.The characteristics of the electrochemical noise and the noise resistance Rn showed remarkable differences at each stage.The electrode area ratio(r) of outside to inside the crevice had a significant influence in the development of crevice corrosion.The time of the induction stage increased with increasing r.However,under the stable development stage of the crevice corrosion,the surface outside the crevice was at an active dissolution state when r was small,while the potential difference between outside and inside the crevice and the corrosion rate inside the crevice were small.When r was big,the surface outside the crevice was at a passive state and the potential difference between outside and inside the crevice was large,which causes serious crevice corrosion.

Keywords

carbon steel, crevice corrosion, area ratio of outside to inside crevice, electrochemical noise, electrochemical impedance

DOI Link

https://doi.org/10.61558/2993-074X.1976

Publication Date

2009-05-28

Online Available Date

2009-05-28

Revised Date

2009-05-28

Received Date

2009-05-28

Recommended Citation

Qian HU, Yu-bing QIU, Xing-peng GUO. Investigation of Electrochemical Noise in the Crevice Corrosion of Q235 Carbon Cteel[J]. Journal of Electrochemistry, 2009 , 15(2): 184-189.
DOI: 10.61558/2993-074X.1976
Available at: https://jelectrochem.xmu.edu.cn/journal/vol15/iss2/11