Corrosion properties of SPV50Q steel in H₂S-containing sour environment

The corrosion properties of SPV50Q steel were performed in H₂S-containing sour environment by polentiodynamic polarization measurement and electrochemical impedance spectroscopy (EIS). The results show that the presence of H₂S considerably influences the corrosion process of SPV50Q steel and its corrosion rate increases with increasing H₂S cotent. With decreasing pH and increasing in temperature of the testing solution, the corrosion of this steel is also enhanced. Although the semicircular diameter of capacitive loop increases with immersion time, its variation amplitude is not obviously great and begins to diminish after certain periodic time, suggesting that the sulfide film formed on the surface can not effectively prevent SPV50Q steel for avoiding the further corrosion.