Application of green products for industrially important materials protection: An amusing anticorrosive behavior of tender arecanut husk (green color) extract at metal-test solution interface

Abstract

The sustainable corrosion impediment of tactic central materials such as mild steel and copper is the subject of utmost importance in contemporary civilization due to their wide spread utility in industrial sectors. This part reports the outcome of chemical (weight loss) and electrochemical measurements on the inhibition of corrosion of mild steel and copper metals in both 0.5 M HCl and 0.5 M NaOH media. Weight loss measurements divulged that, corrosion protection efficiencies were enhanced with increment in the concentration of plant extracts which indicates that dissolution process was stifled; whilst a decrease was noticed with the rise of solution temperature at habitual acid and base concentration is plausible due to thermal agitation of plant extract constituents from the metal surfaces. The maximum protection efficiency observed with immersion period of one hour at 303 K. (93.750% for copper in acid medium, 90% for copper in alkali medium, 93.478% for MS in acid medium and 91.66% for MS in alkali medium). The probable inhibitive modality mechanism of most potent green inhibitor was further corroborated by kinetic and thermodynamic models. Electrochemical studies like, Tafel plot and AC impedance studies were used for appraisingthe green inhibitor behavior. The Tafel plot studies shows that, AH extract act as mixed type corrosion inhibitor for copper in acid media, mild steel in acid and alkali media, whereas AH extract act as anodic type corrosion inhibitor for copper in alkali media. The results of chemical and electrochemical techniques proved that, tender arecanut husk (AH) extract was the most efficacious eco-friendly corrosion inhibitor for mild steel and copper metals in both HCl and NaOH media with a concentration-dependent mode. Surface depiction via scanning electron microscopy (SEM) technique surmised the dearth of corrosion products and topographic amendment of the studied metals. Therefore, technological and economic profit is envisaged from an affirmative result in this study.