Effect of HCO3Concentration on CO2 Corrosion for Q235 Steel
The effects of HCO3- concentration on CO2 corrosion for Q235 steel were investigated by weight loss tests and potentiodynamic polarization curve and EIS (Electrochemical Impedance Spectroscopy) techniques. The results showed that the corrosion rate of Q235 steel decreased wih on increase of HCO3- concentration when [HCO3-] was lower than 600mg/L. An evident active-passive behavior exhibited in anodic process at 1000mg/L·HCO3- .The cathodic reactions were promoted by increasing [HCO3-] when it reached 1000mg/L, H2CO3 and HCO3- become the most important cathodic reaction. Anodic behavior was an active process at higher [HCO3-] concentration and the anodic current density increased with the increase of [HCO3-] concentration.
Huaiying Zhou, Tianlong Gu, Daoguo Yang, Zhengyi Jiang, Jianmin Zeng
A. J. Wei et al., "Effect of HCO3Concentration on CO2 Corrosion for Q235 Steel", Advanced Materials Research, Vols. 197-198, pp. 1723-1727, 2011