This research investigates the corrosion characteristics of simulated heat-affected zones (HAZs) of API X-100 pipeline steels in CO2-saturated brines of different chloride concentrations. It links the significances of the HAZ microstructure and chloride concentration to the corrosion kinetics and corrosion products. The ferritic HAZs dissolve at almost two times the rate of acicular ferritic and bainitic HAZs. This paper shows that the samples corrode at rates increasing with the chloride concentration to a maximum rate, at a low chloride concentration, beyond which the corrosion rates decrease with increased chloride concentrations. For the base steel, for instance, the corrosion current densities increased from 8.5 µA/cm2 in 0.02 mol/L to the maximum 22 µA/cm2 in 0.07 mol/L before they decreased to 10 µA/cm2 in 0.1 mol/L. The corrosion products showed an increase with the chloride concentration, from almost 1-3 µm to 25-35 µm in 0.02 and 0.85 mol/L solutions, respectively.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Re-examining the influence of chloride ions on electrochemical CO2 corrosion of pipeline steels—corrosion of the heat-affected zones (HAZs) of API-X100 steel


    Contributors:

    Published in:

    Publication date :

    2015


    Size :

    9 Seiten




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English