Electrochemistry of CO2 corrosion of mild steel: Effect of CO2 on iron dissolution reaction

被引：80
|
作者：
Kahyarian, Aria [1 ]
Brown, Bruce [1 ]
Nesic, Srdjan [1 ]
机构：
[1] Ohio Univ, Inst Corros & Multiphase Flow Technol, Athens, OH 45701 USA
来源：
CORROSION SCIENCE | 2017年 / 129卷
关键词：
Carbon dioxide; Corrosion; Mechanism; Anodic; Carbonic acid; Iron dissolution; CARBON-STEEL; ELECTRODE IMPEDANCE; ANODIC-DISSOLUTION; REACTION MODEL; PASSIVATION; BICARBONATE; MECHANISM; KINETICS; SYSTEMS; OIL;
D O I：
10.1016/j.corsci.2017.10.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The kinetics of the iron dissolution reaction was investigated in CO2-saturated acidic sodium chloride solutions. While the effect of CO2 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 CO2 and/or its related carbonate species are directly involved in the metal dissolution reaction. The presence of CO2 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 CO2-saturated brines as compared to strong acid solutions at the same pH could possibly be explained by the effect of CO2 on the kinetics of the anodic reaction.
引用
收藏
页码：146 / 151
页数：6
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