A type of 13Cr Steel (0Cr13Ni2P) was selected in this paper as a research object. The corrosion behavior of this 13Cr steel in the CO2 environment were studied by means of electrochemical testing technology, and the effects of Cl-, temperature and other factors on the corrosion behaviors were investigated. There was an obvious passivation region in the 13Cr steel when immersed in NaCl solution saturated with CO2, and the AC impedance spectrum was characterized by dual capacitive arc. The

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... n of CO2 reduced the charge transfer resistance and the passive film resistance, and increased the corrosion rate significantly. The increase of the temperature and Clconcentration had no effect on the characteristics of EIS. The composition of the passivation film on the surface of 13Cr steel was analyzed by XPS, the passive film is n-p type semiconductor. With the increase of the potential of forming passive film, the steady-state current density was decreased, the donor density and acceptor density of passive film was decreased, and the protection performance was improved.