The kinetics of sulphides forming species such as Zn2+, Pb2+ and Fe2+ encountered in geothermal energy systems has the potential to influence the overall corrosion behaviour; uniform and pitting, of carbon steel used in technical equipment. This project investigates the effect of the Zn2+, Pb2+ and Fe2+ within the bulk brine chemistry, on the evolution and surface deposition of sulphide scales; ZnS, PbS and/or FeS at 80oC. The effect of surface deposition of sulphide scales on corrosion product formation, and the corrosion behaviour of carbon steel was investigated over 48 hours. In-situ electrochemical techniques such as LPR was combined with SEM- EDX, and XRD techniques to characterise the electrochemical responses, the composition and morphology of sulphide scales and corrosion product respectively. The extent of pitting corrosion damage on the metal surface was also investigated using white light interferometry. The results shows that bulk precipitation of ZnS & PbS and its subsequent surface deposition directly lowers the bulk pH of the corrosion environment. This was observed to have a direct impact on the overall corrosion characteristics of the corroding interface of carbon steel; this includes effect on FeS morphology, formation kinetics and uniform and pitting corrosion characteristics.