Experimental Study to Inhibit Carbon Steel in Simulated Fuel Medium by Ceftazidime Drug

Abstract

By adding six concentrations of the drug (50, 100, 200, 300, 400, and 500 ppm) to a Simulated Oil Well Water (SOWW), the inhibitive role of Ceftazidime drug was investigated to lower the corrosion risk of carbon steel. Four different temperatures were used to conduct electrochemical tests (303, 313, 323 and 333 K) to achieve the study. The study was then supported by an examination of the inhibited surface using field emission scanning electron microscopy with energy dispers (AFM). The results indicated occurring the inhibition by an anodic inhibitor that controls the dissolution of iron from steel gave the highest inhibition efficiency (IE%) by adding 500 ppm, while the calculation of polarization resistance (R_p) gave the highest resistance by 400 ppm through adsorption the added drug to show flakes shaped structures with decreasing surface roughness () from 307.1 to 276.8   after inhibition. The calculation of adsorption isotherm confirmed the obeying of Langmuir adsorption isotherm by giving the coefficient of linear regression was about one in the range of 0.999 >  > 0.994, with the spontaneous adsorption that estimated from the negative values of  and variation in the type of adsorption to be physically or chemically according to the added concentration because of the differential sign of . The sign of  was positive that reflecting the increasing in randomness at the metal/solution interface.