Characterization of AISI 1005 corrosion films grown under cyclic voltammetry of low sulfide ion concentrations

•The corrosion of AISI 1005 in sulfide solutions was investigated.•The mechanism of film growth on carbon steel in sulfide solutions was studied.•Film growth was characterized using SEM, EDX, XRD and Mössbauer spectroscopy.•Growth of AISI 1005 corrosion films under cyclic voltammetry.

The mechanism of AISI 1005 corrosion in sulfide ion solutions has been investigated using cyclic voltammetry, electrochemical impedance spectroscopy, X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The proposed mechanism occurs with the initial formation of oxygenated ferrous species followed by adsorption of HS− species, precipitation of iron monosulfides and their partial conversion to bisulfide iron. This mechanism was demonstrated by XRD results that revealed Fe-O and Fe-S phases and by MS results that detected pyrite as the major proportion (94%) of the iron species in the corrosion product.