Abstract: With the development of oil and gas resources in the South China Sea, the mileage of offshore pipeline has increased rapidly. However, the harsh marine environment causes corrosion of oil and gas pipeline steel, especially in marine CO2 systems. The rapid increase of CO2 emissions has led to HCO3- and CO32- concentrations in marine systems increased, and has become one of the important factors affected the corrosion of metallic materials in marine structures. In this paper, we had established a simulated dry-wet cycling accelerated corrosion test mo-del, and the electrochemical test and slow strain rate tensile test installations within the thin liquid layer were purposed, to test the X100 steels corrosion behavior in dry-wet cycling environments with different HCO3-. The corrosion morphology and phase composition of the sample surface were characterized using SEM and XRD methods, and revealed the effect of HCO3- concentration changes on the corrosion mechanism of X100 steel in the dry-wet cycling environment. The research results show that the corrosion rate of X100 steel showed a rapid increased and then a slow increased as the HCO3- concentration increases under simulated marine dry-wet cycling conditions. The stress corrosion sensitivity (SCC) increases with increasing HCO3- concentration in the thin liquid layer, and the fracture morphology gradually exhibits brittle fracture. The electrochemical corrosion cathode reaction is suppressed with the high HCO3- concentration, but under the action of the Bockris mechanism, the HCO3- dissociation reaction provides an additional hydrogen source for the electrochemical cathode reaction, and increasing the electrochemical corrosion rate and SCC of the sample.
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2020, Vol. 34 
