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| CORROSION ELECTROCHEMICAL BEHAVIOR OF N80 STEEL IN CO2/HAc ENVIRONMENTS |
| LIU Dong;QIU Yubing;GUO Xingpeng |
| School of Chemistry and Chemical Engineer; Huazhong University of Science & Technology; Hubei Key Laboratory of Materials Chemistry and Service Failure; Wuhan 430074 |
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Abstract The effect of acetic acid on corrosion behavior of carbon steel (N80) in CO2-saturated 1%NaCl solution at 50℃ was investigated by using polarization curve，potentiostatic polarization and electrochemical impedance spectroscopy. The attention was focused on the effect of acetic acid and acetate on the anodic and cathodic reactions respectively. The results indicate that acetic acid adsorbed on electrode surface can be reduced directly by electrochemical reaction, which resulting in increasing the cathodic limited current. Anodic reaction mechanism of N80 steel does not change when HAc is added, but HAc can speed up the formation/dissolution process of intermediates, thereby accelerates anode dissolution process. Acetate can hydrate easily to create acetic acid in carbon dioxide saturated environments, therefore, no matter acetic acid or acetate can increases the CO2 corrosion of N80 steel.
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Received: 14 May 2007
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Corresponding Authors:
GUO Xingpeng
E-mail: GuoXP@mail.hust.edu.cn
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