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.