Development of a reference electrode for study of supercritical CO2 corrosion Conference Paper uri icon

abstract

  • © 2018 by NACE International. Two methods to prepare tungsten/tungsten oxide as reference electrode for performing electrochemical measurements in H2O-saturated super critical (SC) CO2 phase in the study. The W/Woxide reference electrodes are fabricated using electrochemical or thermal oxidation. The stability of each type of tungsten/tungsten oxide electrodes is verified by comparing the potential in brine solutions containing MEG up to 100°C with exposure time over 48 hours. The results are consistent with literature that the reference potential decreases with the increase in temperature. The results also show that the thermal-prepared W/Woxide reference electrode is stable at high temperature. The W/Woxide reference electrode is employed to electrochemically test carbon steel (Q-125) in the SC-CO2 at 65°C. It is found that the W/Woxide reference electrode can be used for studying the electrochemical mechanism of carbon steel corrosion in SC-CO2, assessing the effect of changing oxidizing conditions of the SC-CO2 environment on the carbon steel corrosion kinetics.

author list (cited authors)

  • Cheng, C. H., Ning, J., & Case, R.

publication date

  • January 2018