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THE EFFECT OF ACETIC ACID AND ACETATE ON co2 coRROSION OF CARBON STEEL

THE EFFECT OF ACETIC ACID AND ACETATE ON CO2 CORROSION OF CA...

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湖北省化学化工学会2006年年会暨循环经济专家论坛

作者： X.P.Guo D.Liu Z. Y.Chen Chem. Dept., Huazhong University of Science & Technology, Wuhan, 430074, China

co2 corrosion in the presence of acetic acid (HAc) has recently been recognized as a major cause of premature failure of mild steel pipelines in the oil and gas industry, So the effect of HAc in carbon dioxide Solution has been studied by more and more scholars recently. Though some information concerning the electrochemical behavior and the mechanism of enhanced corrosion has been reported in the presence of Acetic Acid in iterature, the corrosion mechanism when existing acetic acid in co2 corrosion has not been understood well, for example, acetic acid can change the anodic dissolution processes or acetic acid only affect corrosion product film to enhance corrosion rate. In fact, in co2 corrosion environments, from field experiences, the corrosion rate of carbon steel increased when Ac(?)ions are present in the produced liquids, though acetate can increases pH of the liquid. This observation is contrary to most models for co2 corrosion prediction Laboratory research has shown that both HAc and Ac can increase the corrosion rate of iron. In this paper, the effect of acetic acid and acetate on corrosion behavior of carbon steel (N80) in co2-saturated 1%NaCl solution at different temperature and pressure were investigated by using weight-loss test, electrochemical methods (polarization curve, EIS) and surface analysis techniques (SEM, XRD). The attention was focused on the effect of acetic acid and acetate on the anodic and cathodic reactions respectively. The results indicate that (1)the-determining step of cathodic reaction of co2 corrosion is an inhomogeneous chemical reaction (co2 hydrated reaction) at the electrode surface. Because acetic acid adsorbed on electrode surface can be reduced directly by electrochemical reaction, acetic acid and acetate promote the cathodic reduction reaction, and as a result, the corrosion rate was accelerated and independent of pH value of solutions. (2)The intermediates produced in the anodic processes play an important role in th

关键词： acetic acid acetate effect co2 conosion carbon steel

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