S275JR Mild Steel Corrosion Sites Deactivation in Sodium Sesquicarbonate Heavy Deposits Using Piperaquine as Alternative Inhibitor

Abstract

This study researched S275JR MS corrosion sites deactivation in [Na3H(CO3)2] heavy deposits (Gamboru, Borno State, Nigeria), using PPQ as alternative inhibitor, and employed WL, HER, EIS, PDP, SEM and computational techniques. PPQ showed effective MS corrosion mitigation in [Na3H(CO3)2] heavy deposits. IE(%) of 98.8, 99.5, 82.9 and 95.9 %, for gravimetric, HER, EIS and PDP, respectively, at 208 K, were obtained. PPQ had a shortest E of 0.1 eV, with a higher absolute molecular of 2.4, compared to molecular of 0.4, which makes it a better inhibitor of MS corrosion in [Na3H(CO3)2] heavy deposits. With higher inhibitor Ct, its IE(%) increase and CR of MS decreased. This was due to PPQ molecules strong adsorption onto the MS surface. PPQ was also thermodynamically stable, showed less disorderliness, and its absorption was spontaneous and physical.