CO₂ Corrosion Behavior of HP13Cr and N80 Steels in Simulated Oil and Gas Field Environment

The corrosion behaviors of HP13Cr and N80 steels in NaCl solution containing carbon dioxide were investigated by electrochemical methods. The results showed that the corrosion potential of HP13Cr steel was lower than that of N80 steel and the corrosion current density was higher than that of N80 steel. The area of the cycle hysteresis loop in the polarization curves of HP13Cr steel was smaller than that of N80 steel, and indicated a lower propagation degree of pitting corrosion of HP13Cr. The resistance to CO2 corrosion of HP13Cr steel was stronger than that of N80 steel because of the higher polarization resistance. Moreover, due to the high galvanic current, the galvanic couple of HP13Cr and N80 steels should be avoided.