TAF PUBLISHING

This study evaluates the performance of an imidazoline commercial inhibitor in a sweet environment. AISI 1045 carbon steel was chosen, with pH 5 and pH 7, flow rate 7.85 cm/s and 13.09 cm/s, and NaCl 3.5% solution. FTIR, XRD, Weight loss, Polarization, and Electrochemical Impedance Spectroscopy (EIS) tests were performed to obtain complete information regarding the inhibitor’s performance. According to weight loss results at pH 5, the highest efficiency of inhibitor was 82.59% with 200 ppm inhibitor’s concentration, flow rate 7.85 cm/s, and corrosion rate of 0.104 mm/y. While at pH 7, the highest efficiency obtained was 92.697% in 100 ppm concentration of inhibitor, flow rate 7.85 cm/s, and corrosion rate 0.037 mm/y. XRD testing showed Fe24N10 compound formed as a result of a reaction between Fe and the pyridine nitrogen atom. FTIR testing showed a functional group of inhibitors precipitated on the sample’s surface when immersed, and EIS testing showed that the addition of the inhibitor concentration increased the value of polarization resistance of solution, and the value of (constant phase element) decreased. Organic inhibitor becomes alternative protection of corrosion because it is biodegradable, cheap, and also environmentally friendly. The imidazoline inhibitor acts adsorptively on the surface of the AISI 1045 steel by forming the complex Fe24N10 to give a thin film that inhibits the rate of corrosion. Alternative corrosion inhibitors from tobacco can be used or even replace imidazoline inhibitors in applying oil and gas.