Inhibitory effect of expired glavox tablets on A36 carbon steel for optimized service life
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IOP Publishing Ltd
Abstract
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This research delves into the potential of expired Glavox tablets, containing Amoxicillin and
Clavulanic acid, as environmentally friendly substances to inhibit corrosion on A36 carbon steel in
solutions of1MHCl and 3.65 wt% NaCl. The findings from weight loss experiments in1MHCl
indicated a decrease in the corrosion rate, dropping from 1.24mmy−1 for untreated specimens to
0.17mmy−1 for specimens treated with 7.5 ml of Glavox solution. Similarly, in the 3.65 wt% NaCl
solution, the corrosion rate reduced from 0.98mmy−1 to 0.23mmy−1 with the same concentration
of inhibitor. Electrochemical assessments conducted in the HCl medium unveiled alterations in the
corrosion potential (Ecorr) from−0.48Vto−0.35 V, and a decline in the corrosion current density
(icorr) from 3.2mAcm−2 to 0.42mAcm−2, indicating a blend of inhibitory characteristics. Within the
NaCl medium, Ecorr transitioned from−0.45Vto−0.30 V, while icorr decreased from 2.9mAcm−2 to
0.57mAcm−2. Studies on adsorption affirmed the robust adsorption capacity of Glavox on the steel
surface, aligning well with Langmuir, Freundlich, and Temkin isotherm models. The formation of a
barrier of protection on the inhibited samples was revealed by SEM/EDS examination of the surface
morphology. The outcomes propose that expired Glavox tablets exhibit efficacy as corrosion
inhibitors in acidic and saline settings, attaining an inhibition efficiency of up to 86%, predominantly
through adsorption and the formation of a protective film.
Keywords
TJ Mechanical engineering and machinery