Effect of Nb and ti on corrosion characteristics of low alloy steel in supercritical CO2 environment

Abstract

The immersion test and electrochemical experiment are performed to investigate the influence micro-alloying elements Nb and Ti on corrosion characteristics of low alloy steel exposed to CO2 saturated saline solution environment. The corrosion kinetics, potentiodynamic polarization, surface morphology, corrosion phases and max pitting depth are studied deeply and thoroughly. The results show that the major corrosion phases are FeC03, the corrosion rate of No.2 steel with micro-alloying elements Nb and Ti is lower than that of steel No. l, and showing the good corrosion resistance.