Abstract
The investigation focused on elucidating the corrosion mechanism and evolution of corrosion products for 3Cr steel after an exposure to CO2-saturated solutions containing different concentrations of Cl− at 80 and 150 °C. The results show an interaction between dissolved CO2 and Cl− toward corrosion behavior of 3Cr steel. Apart from a competitive relationship between the concentrations of two corrosive species, the evolution of inner and outer films at different temperatures under the interaction between dissolved CO2 and Cl− is a decisive factor in the whole corrosion process, causing a trend of a first increase and then a decrease with increasing Cl− concentration. In addition, the destruction of inner Cr-enriched films after the addition of excessive Cl− conversely reduces the corrosion rates of 3Cr steel, which is mainly due to the formation of FeCO3 crystals instead of Cr(OH)3 in an initial stage of corrosion.
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