Study on Electrochemical Impedance Spectroscopy of Carbon Steel Eroded in Methyldiethanolamine Solution

Authors

Dong-ping WEI, Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;College of Chemistry and Ecological Engineering,Guangxi University for Nationalities,Nanning 530006,Guangxi,China;
Rong-zong HU, Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Dan-mei PAN, Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Wei-xiong HUANG, Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Rui DONG, Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;

Abstract

Corrosion behavior of carbon steel in methyldiethanolamine(MDEA) solution was investigated by Electrochemical Impedance Spectroscopy(EIS).The results were showed that the corrosion rate of carbon steel in solution containing dissolved oxygen is higher than that in solution removed of dissolved oxygen before cathodic activation.They were reversed after cathodic activation.The corrosion rate is increased at first and then decreased when the concentration of MDEA is increased in the blank solutions.In the simulated solutions containing quantities of!heat-stable salts(HSS),the corrosion rate is decreased monotonously with increase of the MDEA concentration.As anodic polarization potential is increased,the EIS of carbon steel in HSS simulated solution showed characteristics of inductive shrinkage,negative impedance and Warburg-response,which implied pitting corrosion,transition from active state to passive state and passive state,respectively.The rate of cathodic reduction is determined by both electrochemical reaction and diffusion process.The rate-determining step of the anodic dissolution is electrochemical reaction.

Keywords

heat-stable salts, methyldiethanolamine, electrochemical impedance spectroscopy, carbon steel, corrosion

DOI Link

https://doi.org/10.61558/2993-074X.1839

Publication Date

2007-11-28

Online Available Date

2007-11-28

Revised Date

2007-11-28

Received Date

2007-11-28

Recommended Citation

Dong-ping WEI, Rong-zong HU, Dan-mei PAN, Wei-xiong HUANG, Rui DONG. Study on Electrochemical Impedance Spectroscopy of Carbon Steel Eroded in Methyldiethanolamine Solution[J]. Journal of Electrochemistry, 2007 , 13(4): 387-391.
DOI: 10.61558/2993-074X.1839
Available at: https://jelectrochem.xmu.edu.cn/journal/vol13/iss4/6