Corrosion and Electrochemical Behavior of Steel in CO2 Bearing Water
1983 年 23 巻 8 号 p. 676-679
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1983 年 23 巻 8 号 p. 676-679
The corrosion mechanism of mild steel in CO2 bearing water has been studied by examining electrochemical behavior of carbonic substances, i.e., H2CO3 and HCO-3. These substances contribute to the cathodic reaction on the steel surface corroding in CO2 bearing waters. In the low pH region, the corrosion rate is controlled by the reduction rate of H2CO3 and is much higher than that in non-carbonic solutions of the same pH. In the high pH region, however, the corrosion rate is controlled by the stability of the FeCO3 film that forms on the steel surface.
