Apricot pomaces extract (Prunus Armeniaca L.) as a highly efficient sustainable corrosion inhibitor for mild steel in sodium chloride solution

• V.I. Vorobyova¹, M.I. Skiba² and I.M. Trus²

¹ National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine. Ave Peremogy 37, Kiev, 03056, Ukraine
² Ukrainian State Chemical-Engineering University, Gagarin Ave. 8, Dnipro, 49005, Ukraine

Abstract: The present study was carried out to identify the components present in the ethanol apricot pomace extract by GC-MS analysis. Various experimental models including iron(III) reducing capacity, total antioxidant capacity, DPPH radical scavenging activity were used for characterization of antioxidant activity of the extract. Weight loss investigation, potentiodynamic polarization, and FTIR techniques were used to study the corrosion inhibition. The maximum inhibition efficiency of 94.6% was achieved by using 500 ppm of the inhibitor. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis were used to characterize the protective film. AFM also illustrated an improvement in the surface properties of the samples in the presence of APE. The influence of the immersion period on inhibition efficiency was evaluated. The GC–MS experimental results show that the major compounds of the APE are 3,4,5-trihydroxybenzoic acid, chlorogenic acid, 3-(3,4-dihydroxyphenyl)-2-propenoic acid, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one, and catechin. The results revealed that in the attendance of the APE and with the immersion time progress up to 48 h, the inhibition capacity of inhibitor was promoted.The mechanism of action of the inhibitor is also discussed. Quantum chemical parameters calculated for the molecules contained in the aqueous extract are interpreted to predict the corrosion inhibition efficiency of the considered extract. The theoretical study gave insights to the active sites, chemical reactivity and possible interaction mechanism between the inhibitor compounds and mild steel surface. The apricot pomace extract studied in this work are potential multifunctional inhibition materials as they showed good antioxidant and anticorrosion properties.

Keywords: green corrosion inhibitors, antioxidant/free radical scavenging activity, phytochemicals, metals and alloys

Int. J. Corros. Scale Inhib., 2019, 8, no. 4, 1060-1083 PDF (935 K)
doi: 10.17675/2305-6894-2019-8-4-15

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