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The effect of acetic acid and acetate on CO2 corrosion of carbon steel

Dong Liu (Hubei Key Laboratory of Materials Chemistry & Service Failure, Department of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan, People's Republic of China)
ZhenYu Chen (Hubei Key Laboratory of Materials Chemistry & Service Failure, Department of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan, People's Republic of China)
XingPeng Guo (Hubei Key Laboratory of Materials Chemistry & Service Failure, Department of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan, People's Republic of China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 23 May 2008

Abstract

Purpose

The purpose of this paper is to consider the effect of acetic acid and acetate on the anodic and cathodic reactions of carbon steel present in CO2 corrosion.

Design/methodology/approach

The corrosion behaviour of carbon steel (N80) in CO2‐saturated 1% NaCl solution at 50°C and 0.1 MPa was investigated by using weight‐loss tests, electrochemical methods (polarization curves and electrochemical impedance spectroscopy) and surface analysis (scanning electron microscopy).

Findings

The results indicated that: both HAc and Ac significantly increased the corrosion rate of carbon steel, and the surface chemical reactions of cathodic reduction were enhanced in the presence of HAc and Ac. Because adsorbed HAc could be reduced directly in the presence of Ac, the corrosion rate increased, even though the pH of the solution increased. Ac played an important role in the anodic dissolution processes, which mainly affects the formation/adsorption of intermediates, and acts to form more soluble corrosion products.

Originality/value

The results of this work clarify the role of acetic acid or acetate in the anodic and cathodic reactions of CO2 corrosion.

Keywords

Citation

Liu, D., Chen, Z. and Guo, X. (2008), "The effect of acetic acid and acetate on CO2 corrosion of carbon steel", Anti-Corrosion Methods and Materials, Vol. 55 No. 3, pp. 130-134. https://doi.org/10.1108/00035590810870437

Publisher

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Emerald Group Publishing Limited

Copyright © 2008, Emerald Group Publishing Limited