INFLUENCES OF Fe3C AND PEARLITE ON THE ELECTROCHEMICAL CORROSION BEHAVIORS OF LOW CARBON FERRITE STEEL

doi:10.3724/SP.J.1037.2011.00198

Acta Metall Sin

2011, Vol. 47

Issue (10): 1227-1232 DOI: 10.3724/SP.J.1037.2011.00198

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INFLUENCES OF Fe₃C AND PEARLITE ON THE ELECTROCHEMICAL CORROSION BEHAVIORS OF LOW CARBON FERRITE STEEL

WANG Liwei, DU Cuiwei, LIU Zhiyong, ZENG Xiaoxiao, LI Xiaogang

Key Laboratory of Corrosion and Protection, Ministry of Education of China, Corrosion and Protection Center, University
of Science and Technology Beijing, Beijing 100083

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WANG Liwei DU Cuiwei LIU Zhiyong ZENG Xiaoxiao LI Xiaogang. INFLUENCES OF Fe₃C AND PEARLITE ON THE ELECTROCHEMICAL CORROSION BEHAVIORS OF LOW CARBON FERRITE STEEL. Acta Metall Sin, 2011, 47(10): 1227-1232.

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Abstract The microstructure of X80 pipeline steel welding joint, consisted of Fe₃C and degenerated pearlite, was simulated by carburizing treatment. The effects of Fe₃C and pearlite on the electrochemical properties of bainitic ferrite steel and localized corrosion occurrence regularity in Yingtan soil simulation solution were investigated by scanning Kelvin probe (SKP), scanning vibrating probe (SVP) and local electrochemical impedance spectroscopy (LEIS), combined with immersion test. It is demonstrated that the corrosion potential of degenerated pearlite is lower than bainitic ferrite, and decreases with increasing Fe₃C content. Localized corrosion occurs on the surface of the carburized sample in Yingtan soil simulation solution. The anodic oxidation process is observed to be initiated on the carburized degenerated pearlite, whereas the cathodic reaction involving dissolved H⁺ is on bainitic ferrite, and the anodic current density increases with increasing Fe₃C concentration. As the ion contents of the soil simulation solution doubled, the anodic dissolution of degenerated pearlite increases, and the local impedance of the electrode decreases.

Key words: ferrite steel carburizing microstructure local electrochemistry

Received: 06 April 2011

ZTFLH:

TG174

Fund:

Supported by National Natural Science Foundation of China (Nos.50971016 and 50901041) and Fundamental Research Funds for the Central Universities (No.FRF–TP–09–029B)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00198 OR https://www.ams.org.cn/EN/Y2011/V47/I10/1227

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