采用动电位扫描、恒电位极化和电化学交流阻抗测试技术，研究了乙酸(HAc)对N80碳钢在50℃、饱和CO2的1%NaCl溶液中的电化学腐蚀行为的影响，并讨论了阴极、阳极的反应机理。研究表明: HAc能够直接在电极表面还原，使阴极极限电流增加。 HAc未改变阳极反应机理，但能够加速中间产物的形成/溶解过程，从而加速阳极溶解过程。在饱和CO2溶液体系，乙酸盐易与碳酸生成HAc，而参与电化学反应。因此，无论是HAc还是乙酸盐均能够加速N80碳钢电极的CO2腐蚀。
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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