Historically, the mechanism of localized corrosion in CO2 (sweet) environments has been poorly understood. This shortcoming is an obstacle in the development of corrosion control and protection protocols. The purpose of this PhD project was to explore and understand localized sweet corrosion mechanisms through systematic study.
An artificial pit cell was developed in order to directly measure the galvanic current resulting from localized corrosion propagation. Thus, galvanic mechanisms of localized CO2 corrosion were elucidated. It was found that two surfaces coexist as termed anode (bare surface in the pit) and cathode (surrounding surface usually covered by corrosion scales) with open circuit potentials (OCP) for these different surfaces being different
under the same bulk environments. ...