Abstract The kinetics of the iron dissolution reaction was investigated in CO 2 -saturated acidic sodium chloride solutions. While the effect of CO 2 on the iron dissolution reaction during corrosion process has received little attention in the existing literature, the experimental polarization curves obtained in the present study on X65 mild steel suggest that CO 2 and/or its related carbonate species are directly involved in the metal dissolution reaction. The presence of CO 2 was found to significantly influence the kinetics and the mechanism of the iron dissolution reaction at partial pressures as low as 1 bar. The higher corrosion rates observed in CO 2 -saturated brines as compared to strong acid solutions at the same pH could possibly be explained by the effect of CO 2 on the kinetics of the anodic reaction.

中文翻译：

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低碳钢 CO 2 腐蚀的电化学：CO 2 对铁溶解反应的影响

摘要 在CO 2 饱和的酸性氯化钠溶液中研究了铁溶解反应的动力学。虽然 CO 2 在腐蚀过程中对铁溶解反应的影响在现有文献中很少受到关注，但本研究在 X65 低碳钢上获得的实验极化曲线表明 CO 2 和/或其相关碳酸盐物种直接参与在金属溶解反应中。发现 CO 2 的存在显着影响分压低至 1 bar 时铁溶解反应的动力学和机理。在相同 pH 值下，与强酸溶液相比，在 CO 2 饱和盐水中观察到的腐蚀速率更高，这可能是因为 CO 2 对阳极反应动力学的影响。