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Open AccessArticle

Green Corrosion Inhibition of Mild Steel by Hydrazone Derivatives in 1.0 M HCl

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Laboratory of Applied Chemistry and Environment, ENSA, University Ibn Zohr, PO Box 1136, Agadir 80000, Morocco
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Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul 05029, Korea
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Department of Chemistry, College of Education, Kirkuk University, Kirkuk 36001, Iraq
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Department of Chemistry, College of Science, King Khalid University, P. O. Box 9004, 61413 Abha, Saudi Arabia
5
Departement of Chemistry, Anugrah Narayan College, Patliputra University, Patna 800013, Bihar, India
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(7), 640; https://doi.org/10.3390/coatings10070640
Received: 29 May 2020 / Revised: 24 June 2020 / Accepted: 29 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Modern Trends in Corrosion Protection of Steels)
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.
Keywords: corrosion inhibitor; mild steel; electrochemical; hydrazone derivative; SEM-EDX analysis corrosion inhibitor; mild steel; electrochemical; hydrazone derivative; SEM-EDX analysis
MDPI and ACS Style

Chaouiki, A.; Chafiq, M.; Lgaz, H.; Al-Hadeethi, M.R.; Ali, I.H.; Masroor, S.; Chung, I.-M. Green Corrosion Inhibition of Mild Steel by Hydrazone Derivatives in 1.0 M HCl. Coatings 2020, 10, 640.

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