An Electrochemical Model for Prediction of Corrosion of Mild Steel in Aqueous Carbon Dioxide Solutions
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...However, significant progress has been achieved in understanding the mechanism of CO2 corrosion in the oil and gas industry [7,12–18], but an understanding of its inhibition mechanism and the kinetics of the inhibition process necessary to quantify formulations that will provide a desirable level of protection, remains incomplete....
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...Similar observation has been made by previous researchers [14,32] and the behaviour attributed to the increase in HCO 3 ions with pH which saturates the surface of the metal and thus inhibits the transport of the Fe ion from the metal lattice....
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...[37] and in CO2-saturated solutions [14]....
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"An Electrochemical Model for Predic..." refers background or result in this paper
...Tafel Slope — From the experiments, bc for H2CO3 reduction in Equation (26) was found to be similar to that for H+ reduction (≈ 120 mV/decade at 20°C), which was in agreement with deWaard and Milliams....
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...11 Exchange Current Density — For tref = 20°C, the exchange current density for H2CO3 reduction in Equation (26) has a similar value as the one for H+ reduction iref o(H2CO3) ≈ 6 x 10–2 A/m 2....
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