Investigation of the Effect of Different Inhibitory Temperatures of X70 Microaloy Steel in Acidic Environment in one Molar Sulfuric Acid Solution

Corrosion is one of the most costly problems for the industry, which causes a lot of waste of time and manpower in this field. These costs can be directly related to the use of paints and inhibitors in the corrosion process, repair of metal parts or the use of steel, or indirectly affect the costs of damage, environmental hazards, closure or failure of a plant. . The aim of this study was to investigate the effect of temperature on the corrosion behavior of X70 micro-alloy steel in a sour environment in a solution of one molar of sulfuric acid in the presence of benzomidazole and methicbenzomidazole. With increasing temperature from 25 to 45 and 65° C, in the case of benzomidazole inhibitor, the protective layer formed on the surface is broken and less is formed at 25° C, as a result of this phenomenon, better adsorption is formed on the passive layer. The electron transfer is delayed, then the benzomidazole inhibitor is changed and subjected to an increase in temperature to 65° C, so that the protective layer increases again and the corrosion current does not decrease. From this decrease and increase of corrosion flow, a protective layer is formed at 45° C, which has relative adhesion and strength, and with increasing temperature up to 65° C, a protective layer begins to form at a lower potential. However, the protective layer is not recommended at all for this inhibitor. This is especially evident in X70 micro-alloy steel. Best Operating Temperatures Benzomidazole and methyl benzomidazole at room temperature are both inhibitors that improve corrosion resistance by increasing their amount in corrosion solution.