Abstract
Plant extracts have shown promising corrosion inhibitive actions for different metals in diverse corrosive climate. In numerous studies, it has been demonstrated that corrosion inhibitive features of plant extracts are due to the presence of complex mixtures of phytomolecules in their composition. However, rare efforts have been made to identify those phytomolecules accountable for the activity of the extracts. Therefore, in this paper, several Matricaria aurea extracts were prepared and assessed for their anticorrosive actions for mild steel (MS) in corrosive media (1.0 M HCl). Among the tested extracts, the methanolic extract showing the utmost anticorrosive activity was selected and processed further to identify its active phytomolecules, which led to the identification of a novel green corrosion inhibitor, MAB (Apigetrin). Furthermore, the anticorrosive properties of MAB on MS were evaluated comprehensively involving gravimetric, linear polarization, Tafel plots, EIS, and techniques like SEM and EDS. These findings expose that MAB performs like a mixed-type inhibitor and conforms the isotherm of Langmuir adsorption model. Moreover, the MS surface via SEM techniques exhibits a remarkable advanced surface of the MS plate in the company of MAB. The outcome of results through electrochemical analysis and weight loss methods were in good consonance, which depicts remarkable inhibition properties of the novel green inhibitor MAB.
Highlights
Plants have been an excellent, cheap, and renewable source of natural products either in the form of extracts or pure organic compounds
Column chromatography of n-BuOH fraction (75.0 g) on silica gel column employing different ratios of CHCl3 and MeOH as elutant, which yielded 97 fractions. Pooling of these fractions based on their TLC profile led to produce four major sub-fractions: Frs 11-13 (MA-1), Frs 15-19 (MA-2), Frs 28-34 (MA-3), and Frs 41-81 (MA-4) (Figure 1)
In the present study, chemical investigation and anticorrosive evaluation of various M. aurea extracts for mild steel (MS) in acidic solution led to the identification of an efficient anticorrosive component MAB from the n-butanol extracts of M. aurea
Summary
Plants have been an excellent, cheap, and renewable source of natural products either in the form of extracts or pure organic compounds (phytomolecules). Plant extracts are composed of highly complex mixtures of phytomolecules belonging to various chemical classes such as flavonoids, terpenoids, alkaloids, anthocyanins, tannins, and saponins These phytomolecules are rich in π electrons (benzene ring, double/triple bonds) and contain electronegative functional groups and heteroatoms such as oxygen, sulfur, and nitrogen in their chemical structure. Natural products from plants as green corrosion inhibitors have been reviewed in several papers [1,2,3,18,19] From all these studies, it has been revealed that a large number of phytomolecules that present in the extract composition are responsible for their corrosion inhibitive properties. Corrosion inhibitive properties of M. aurea are being investigated here for the first time
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