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In the field of metal corrosion, understanding the corrosive mechanism of corrosive ions on metals is very important for the protection of materials. In this paper, the effect of F and Cl on the corrosion of 904L stainless steel surface passive film in an acidic environment was studied. A comparison was made between how two ions form and destroy the passive film on a 904L stainless steel surface. Electrochemical dynamic behavior was studied by using cyclic polarization, potentiostatic polarization, electrochemical impedance spectroscopy (EIS), and so on. Selective solubilization was studied by an inductively coupled plasma optical emission spectrometer (ICP-OES) and the constitution of surface product films was analyzed by X-ray photoelectron spectroscopy (XPS). The results show that the F participate in the composition of the passive film formed by 904L in the F-containing acidic environment.

Study on the Effect of F− and Cl− on the Differentiation of 904L Stainless Steel Passive Film in acid Environment