Abstract

UGI, B. U. et al. S275JR Mild Steel Corrosion Sites Deactivation in Sodium Sesquicarbonate Heavy Deposits Using Piperaquine as Alternative Inhibitor. Port. Electrochim. Acta [online]. 2024, vol.42, n.2, pp.101-114.  Epub Jan 31, 2024. ISSN 0872-1904.  https://doi.org/10.4152/pea.2024420202.

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 σ of 2.4, compared to molecular η 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.

Keywords : adsorption; corrosion; EIS; HOMO; LUMO; (Na₃H(CO₃)₂); physisorption PDP; PPQ; SEM.

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