Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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$Co_2$ Corrosion Mechanism of Carbon Steel in the Presence of Acetate and Acetic Acid

  • Liu, D. (Dept. of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan) ;
  • Fu, C.Y. (Dept. of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan) ;
  • Chen, Z.Y. (Dept. of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan) ;
  • Guo, X.P. (Dept. of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan)
  • Published : 2007.10.31
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Abstract

The corrosion behavior of carbon steel (N80) in carbon dioxide saturated 1%NaCl solution with and without acetic acid or acetate was investigated by weight-loss test, electrochemical methods (polarization curve, Electrochemical impedance spectroscopy). The major objective is to make clear that the effect of acetic acid and acetate on the corrosion of carbon steel in $Co_2$ environments. The results indicate that either acetic acid or acetate accelerates cathodic reducing reaction, facilitates dissolution of corrosion products on carbon steel, and so promotes the corrosion rate of carbon steel in carbon dioxide saturated NaCl solution. All Nyquist Plots are consisting of a capacitive loop in high frequency region, an inductive loop in medial frequency region and a capacitive arc in low frequency region. The high frequency capacitive loop, medial frequency inductive loop and low frequency capacitive arc are corresponding to the electron transfer reaction, the formation/adsorption of intermediates and dissolution of corrosion products respectively. All arc of the measured impedance reduced with the increase of the concentration of Ac-, especially HAc. However, the same phenomenon is not notable after reducing pH value by adding HCl. HAc is a stronger proton donor and can be reduced directly by electrochemical reaction firstly. Ac- can't participate in electrochemistry reaction directly, but $Ac^-$ an hydrate easily to create HAc in carbon dioxide saturated environments. HAc is as catalyst in $Co_2$ corrosion. As a result, the corrosion rate was accelerated in the presence of acetate ion even pH value of solution increased.

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