Effect of HCO3Concentration on CO2 Corrosion for Q235 Steel

Ai Jun Wei; Fu Yong Huo; Hua Yi Jiang

doi:10.4028/www.scientific.net/AMR.197-198.1723

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 197-198Effect of HCO3Concentration on CO2 Corrosion for...

Effect of HCO₃Concentration on CO₂ Corrosion for Q235 Steel

Abstract:

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.

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Periodical:

Advanced Materials Research (Volumes 197-198)

Pages:

1723-1727

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.197-198.1723

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Online since:

February 2011

Authors:

Ai Jun Wei, Fu Yong Huo, Hua Yi Jiang

Keywords:

Corrosion Rate, EIS, Polarization Curve, Q235 Steel

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