Electrochemical impedance spectroscopy (EIS) was used to study carbon dioxide (CO2) corrosion product scales and their effects on further CO2 corrosion. Objectives were to determine the suitability of EIS for studying corrosion scales and to investigate the influence of environmental factors on scale formation. EIS provided useful information about protective abilities and electrochemical properties of corrosion scales. CO2 corrosion scales formed at high-temperature and pressure provided better protection than those formed at low-temperature and pressure. The level of protection of the scale formed at higher temperature and pressure increased with exposure time. EIS results were compared with coupon weight-loss measurements. Scales were analyzed using a combination of Fourier transform infrared (FTIR) analysis, x-ray diffraction (XRD), and electron microscopy.

Subject
Electrochemical impedance spectroscopy, Corrosion rate, Metal surfaces, Autoclaves, Sodium chloride, Protective scales, Corrosion products, Corrosion scales, Scale formation, Brines, Carbon dioxide, Corrosion protection, Electrodes
Keywords:
carbon dioxide corrosion, corrosion kinetics, electrochemical impedance spectroscopy, Fourier transform infrared analysis, product scale, scanning electron microscopy, surface characterization, weight-loss measurement, x-ray diffraction
NACE International
1998
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