Molybdenum accumulated in the inner layer in both the corrosion environments. Transport by pipelines is one of the preferred options and thus, for safe operations, such pipelines should not be subject to internal corrosion. The inhibition efficiency in CO2 medium was similar to the 0.1 M HCl, and the Quebracho decreased expressively the corrosion rate. This paper briefly reviews such interaction between main mineral scales and corrosion processes in oil well condition based on the available literature data. Currently, hydropower has the biggest share, followed by wind and solar power. The corrosion scale formed on the steel surface in solution containing CaCO 3 is a carbonate with iron and calcium (Fe x Ca 1−x CO 3) while the corrosion scale formed without CaCO 3 was composed basically by FeCO 3; This iron carbonate scale acts as a barrier to CO2 corrosion, and can reduce the general corrosion rate. Despite its importance, there is minimal research in the literature addressing the effect of calcium ions, and specifically CaCO 3 scale, on the CO 2 corrosion mechanism. Quebracho extract is a cathodic inhibitor in 0.1 M HCl medium for SAE 1020 steel and the inhibition efficiency is dependent on the extract concentration. The experimental results demonstrated that the corrosion kinetics of both the corrosion environments was similar. Electrochemical techniques including linear polarization resistance (LPR), and potentiodynamic polarization measurements, were used to monitor the corrosion rate during experiments and study the corrosion mechanism. On the other hand, formation of scales on the surface of tubulars either decrease or increase the corrosion rate depends on the physiochemical characteristics of the surface layers. Formation of mineral scales and metallic corrosion are main concerns in flow assurance of oil production wells. To assess their suitability to be used in a geothermal power plant, the corrosivity of the artificial brine to three common construction materials was investigated with exposure and electrochemical tests. In addition, consumers spend time and descaling chemical agents to remove lime scaling from surfaces . Corrosion products such as iron carbonate, any forms of iron sulfides and/or iron oxides are directly affected by the magnitude of corrosion rate. The mechanism proposed is that of complexing with Fe (II) within the hydroxide film to give both ferrous carbonate and a dissolved complex. Greenhouse Gas Control 23 (2014) 30-43. During the execution of the measurements, the pressure drop remained unchanged. It is a silver-like metallic element that can be extracted from calcium chloride and other forms of fused salts via electrolysis. As a consequence of the situation depicted above, it is evident that a more systematic work is required to clarify the mechanisms involved and to develop a selection criterion for the available information. Consequently, precipitation of CaCO 3 as scale on the internal wall of the pipeline can readily occur due to changes in operational and environmental parameters as produced fluids are transferred from downhole to surface facilities. Finally, more recently employed experimental techniques are considered in their potential to provide a further understanding of FeCO3 and mixed carbonate kinetics. Calcium Chloride: solutions at room temperatures have a slight action on aluminum. x The electrochemical impedance spectroscopy (EIS) and polarization resistance technique were used to investigate the susceptibility of N80 steel to pitting corrosion under stagnant condition and the corrosion behavior under flowing condition with/without precorrosion in 3% NaCl solution, in 3% NaCl + 1.5% CaCl2 solution and in 4.6% NaCl solution (equivalent Cl− concentration to 3% NaCl + 1.5% CaCl2 solution) saturated by CO2 at 57 °C. The importance of chemical composition and microstructure on CO2 corrosion of carbon and low alloy steels has been widely recognized, but different aspects are still uncertain and contradictory results can be found in the literature. This review presents state-of-the-art knowledge concerning how Ca²⁺ and Mg²⁺ influence the CO2 corrosion mechanism. 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