Formation of corrosion products in testing and in service conditions affects hydrogen absorption in High Strength Low Alloy steels exposed to sour environments and therefore its SSC resistance. This work was focused on the evaluation of the characteristics of film formation in sour environments used for qualification of AISI 4130 steels and its effect on hydrogen absorption. To do that film formed in NACE standard solution was characterized using SEM/EDS Mössbauer and Infrarred spectroscopy and X-Ray Diffraction while film protectiveness was evaluated with a Devanathan Stachurski double cell at open circuit potential. Hydrogen uptake was related to the film composition and a mechanism of sulfide formation was presented.