Loop testing has been carried out to identify the corrosion for 13Cr SS, modified 13Cr SS and 15Cr SS under 2 MPa CO2 in 20,000 ppm NaCl solution with varying concentrations of H2S and organic acids at a temperature of 40°C. It is found that the corrosion behaviors of the steels strongly depend on H2S and organic acids. The results indicate that the 13 Cr SS corrodes significantly at 2 MPa CO2 conditions with H2S present. The modified 13 Cr SS and 15 Cr SS show very good corrosion resistances under CO2 with different H2S partial pressures from 0 to 0.002 MPa. However, severe pitting and general corrosion are observed under the CO2-H2S environments with 0.01 and 0.02 M acetic/propionic acids for both modified 13 Cr SS and 15 Cr SS.

Subject
Acids, Test methods, Materials, Hydrogen concentration, Acid concentration, Corrosion rate, Partial pressures, Organic acids, Corrosion behavior, Steel, Pitting, Localized corrosion, Types of corrosion
Keywords:
13Cr SS, modified 13Cr SS, modified 15Cr SS, CO2, H2S, organic acids
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2012
Association for Materials Protection and Performance (AMPP)
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