Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO<sub>2</sub> environments

Li-ning Xu; Jin-yang Zhu; Min-xu Lu; Lei Zhang; Wei Chang

doi:10.1007/s12613-015-1099-6

Volume 22 Issue 5

May 2015

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文章导航 > 矿物冶金与材料学报（英文） > 2015 > 22(5): 500-508

Li-ning Xu, Jin-yang Zhu, Min-xu Lu, Lei Zhang, and Wei Chang, Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO₂ environments, Int. J. Miner. Metall. Mater., 22(2015), No. 5, pp. 500-508. https://doi.org/10.1007/s12613-015-1099-6

Cite this article as:

Li-ning Xu, Jin-yang Zhu, Min-xu Lu, Lei Zhang, and Wei Chang, Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO2 environments, Int. J. Miner. Metall. Mater., 22(2015), No. 5, pp. 500-508. https://doi.org/10.1007/s12613-015-1099-6

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Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO₂ environments

Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
CNOOC Research Institute, Beijing 100027, China

通讯作者:
Li-ning Xu E-mail: xulining@ustb.edu.cn

中文摘要

The welded joints of 3Cr pipeline steel were fabricated with commercial welding wire using the gas tungsten arc welding (GTAW) technique. Potentiodynamic polarization curves, linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS) were used to investigate the corrosion resistance and the growth of a corrosion film on the weld zone (WZ). The changes in electrochemical characteristics of the film were obtained through fitting of the EIS data. The results showed that the average corrosion rate of the WZ in CO₂ environments first increased, then fluctuated, and finally decreased gradually. The formation of the film on the WZ was divided into three stages:dynamic adsorption, incomplete-coverage layer formation, and integral layer formation.

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Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO₂ environments

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Abstract

Abstract

The welded joints of 3Cr pipeline steel were fabricated with commercial welding wire using the gas tungsten arc welding (GTAW) technique. Potentiodynamic polarization curves, linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS) were used to investigate the corrosion resistance and the growth of a corrosion film on the weld zone (WZ). The changes in electrochemical characteristics of the film were obtained through fitting of the EIS data. The results showed that the average corrosion rate of the WZ in CO₂ environments first increased, then fluctuated, and finally decreased gradually. The formation of the film on the WZ was divided into three stages:dynamic adsorption, incomplete-coverage layer formation, and integral layer formation.
- petroleum pipelines;
- steel corrosion;
- welded joints;
- carbon dioxide;
- electrochemical impedance spectroscopy