Abstract
A heterocyclic phenylhydrazone 2-[(E)-(2-phenylhydrazinylidene)methyl]pyridine (P2APH) and its reduced form 2-[(2-phenylhydrazinyl)methyl]pyridine (RP2APH) were synthesized, characterized, and subjected to corrosion inhibition investigation on carbon steel (CS) in 1 M HCl using gravimetric, polarization, electrochemical noise, quantum chemical, and surface studies. P2APH showed more inhibition capacity than RP2PPH. But RP2PPH was very stable in acid medium and showed pronounced corrosion inhibition efficacy for days. Energy of HOMO and LUMO, their difference, number of electrons transferred, electronegativity, chemical hardness, and so forth were evaluated by quantum chemical studies. Agreeable correlation was observed between the results of quantum chemical calculations and other corrosion monitoring techniques.
Highlights
Acid corrosion is a serious problem in many metal industries
The corrosion inhibition behaviour of Schiff base N,N-bis(salicylidene)-1,2-ethylenediamine (Salen), mixture of its parent compounds, and reduced form of Salen on carbon steel in 1 M HCl solution was studied by da Silva et al [11] using corrosion potential measurements, polarization studies, EIS, and spectrophotometric measurements
On analyzing the Power spectral density (PSD) plots and maximum entropy method (MEM) curves, it is clear that the magnitude of potential noise values is very much higher for blank metal specimen than the specimens immersed in acid in the presence of P2APH and RP2APH (1.0 mM)
Summary
Acid corrosion is a serious problem in many metal industries. The corrosion inhibition behaviour of Schiff base N,N-bis(salicylidene)-1,2-ethylenediamine (Salen), mixture of its parent compounds, and reduced form of Salen on carbon steel in 1 M HCl solution was studied by da Silva et al [11] using corrosion potential measurements, polarization studies, EIS, and spectrophotometric measurements. To explore the mechanism of corrosion inhibition, contemporary investigators rely on computational quantum chemical and molecular simulation techniques [12,13,14,15,16,17,18]. Industries are ever in search of soluble, highly stable, economical, and potential corrosion inhibitors. This article reveals the corrosion inhibition behaviour of two heterocyclic molecules on carbon steel in HCl medium, which was explored by gravimetric, electrochemical, quantum chemical, and surface analytical techniques
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