Corrosion of C110 carbon steel in high-pressure aqueous environment with mixed hydrocarbon and CO2 gas

When CPPR was varied from 0 to 100%, similar corrosion rate trends were observed at 41.37 and 62.05 MPa. Corrosion rate increased to a maximum value and subsequently decreased as the CPPR was increased to 100%. A dense and compact corrosion product was formed at 41.37 MPa and 100% CPPR. To detect presence of localized corrosion, total reduction in Load Carrying Capacity (LCC) and reduction in LCC due to uniform corrosion were determined and compared. Results show no mechanical property degradation after exposure indicating absence of localized corrosion. The total reduction was slightly higher than the reduction due to uniform corrosion. One possible explanation for this observation could be minor variation of corroded specimen thickness, which resulted in underestimation of LCC reduction due to uniform corrosion.