Abstract
In the present study, the inhibition performance of two synthesized hydrazone derivatives (HDZs), namely, (E)-N′-(2,4-dimethoxybenzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (HYD-1) and N′-cyclohexylidene-2-(6-methoxynaphthalen-2-yl) propanehydrazide (HYD-2) on mild steel (MS) in 1.0 M HCl was investigated using weight loss measurements, electrochemical techniques, and scanning electron microscope (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX). The experimental data suggested that the hydrazone derivatives exhibited a high inhibition performance, which increases with increasing their concentrations. HYD-1 and HYD-2 presented maximum inhibition efficiencies of 96% and 84%, respectively, at an optimal concentration of 5 × 10–3 M. The principal observations that resulted from electrochemical studies are that HYDs affected both anodic and cathodic reactions (mixed inhibitors). Their adsorption, which is a combination of chemisorption and physisorption, obeyed the Langmuir isotherm model. Furthermore, the temperature effect was carried out at various temperatures ranging from 303 to 333 K to verify the corrosion inhibition performance of HYD-1 at higher temperatures. Moreover, SEM-EDX analysis confirmed that HYDs can ensure remarkable prevention against corrosion through the adsorption onto the metal surface.
Highlights
It is well known that acid solutions, especially hydrochloric acid, used for the removal of undesirable scale and rust in metal finishing industries, oil-well acidizing in oil recovery, cleaning of boilers, etc., trigger corrosion of pure metals and alloys [1]
The effect of inhibitors concentrations on the corrosion rate of mild steel was primarily studied in the blank solution and in a solution containing different concentrations of studied hydrazone derivatives using the weight loss technique
These can be explained by several factors. These preliminary by apreliminary gravimetricresults study, differences in inhibitory efficacies canFrom be explained by severalresults factors.obtained. From these a possibleby explanation for study, the better performance of HYD-1 is better that it performance contains powerful functional obtained a gravimetric a possible explanation for the of HYD-1 is that groups like methoxy groups, acyl groups, as well as the length of the carbon chain, which promote its it contains powerful functional groups like methoxy groups, acyl groups, as well as the length of the adsorption onto the mild steel surface
Summary
It is well known that acid solutions, especially hydrochloric acid, used for the removal of undesirable scale and rust in metal finishing industries, oil-well acidizing in oil recovery, cleaning of boilers, etc., trigger corrosion of pure metals and alloys [1]. Investments in protective measures should be required to prevent the metal loss due to corrosion It is well established from a variety of studies that organic compounds containing heteroatoms such as N, S, P, and O, functional groups, π-bonds, and aromatic heterocyclic rings play a vital role in the inhibition and mitigation of corrosion in acidic environments [4,5]. Organic compounds with these specific elements in their molecular structures. The inhibition effect of the target inhibitors was investigated through the morphological characterization of the mild steel substrates by scanning electron microscope/energy-dispersive X-ray spectroscopy (SEM/EDX) analysis
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