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The formation and evolution of the corrosion scales on the super 13Cr stainless steel (SS) surface after exposure in a formate completion fluid with the presence of various aggressive substances was investigated. The results indicate that the formation of Fe 3 O 4  covered the surface of super 13Cr SS as the inner layer accompanied with outer scattered FeS. The corrosion rate was below 0.07 mm/year after 120 h of exposure in the formate fluid at 180°C under N 2  environments; the presence of aggressive substances such as sulfide and CO 2  in the formate fluid promoted the proceeding of anodic dissolution in the early period, and the ingress of CO 2  progressively increased the general corrosion rate to 1.7 mm/year. For CO 2 -containing conditions, the formation of FeCr 2 O 4  and Cr(OH) 3  was detected in the inner corrosion product layers, and the precipitation of “sheet”-shaped iron carbonate (FeCO 3 ) was detected as the outer layer. The accumulation rate of corrosion products increases by two orders of magnitude with the ingress of CO 2 , corresponding to thicker corrosion products, but the dissolution rate is still three orders of magnitude higher than when CO 2  was absent.

Formation and Evolution of the Corrosion Scales on Super 13Cr Stainless Steel in a Formate Completion Fluid With Aggressive Substances