Corrosion Inhibition of Mild Steel in Acidic Media by N-[(3,4-Dimethoxyphenyl)Methyleneamino]-4-Hydroxy-Benzamide

Muthamma, K and Kumari, Preethi P and Lavanya, M and Rao, Suma (2020) Corrosion Inhibition of Mild Steel in Acidic Media by N-[(3,4-Dimethoxyphenyl)Methyleneamino]-4-Hydroxy-Benzamide. Journal of Bio- and Tribo-Corrosion, 10. ISSN 2198-4220

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Mild steel (a low carbon steel) is an afordable engineering material used for many purposes in various environments includ�ing mild acidic environment with some precautions. The corrosion behaviour of mild steel (MS) in 0.5 M H2SO4 and 0.5 M HCl, in the temperature range (303–323 K) without and with the inhibitor N-[(3,4-dimethoxyphenyl) methyleneamino]- 4-hydroxy-benzamide (DMHB), was investigated using Potentiodynamic polarization and Electrochemical impedance spec�troscopy (EIS) techniques supplementing with surface characterization study using scanning electron microscope (SEM) and atomic force spectroscopy (AFM). Experimental observations were found to be in agreement with Density functional theory (DFT) calculations. The inhibition eiciency increases with increase in DMHB concentration and showed maximum inhibition eiciency of 86% in 0.5 M H2SO4 and 81% in 0.5 M HCl, respectively, at concentration of 3 × 10─3 M at 303 K. The inhibition eiciency of DMHB obtained relatively at its lower concentration (3 × 10─3 M) compared to other reported related compounds conirms its potential towards corrosion inhibition. The variation in the kinetic and thermodynamic parameters indicated physisorption of DMHB on MS and its mixed type inhibitive action followed Langmuir’s isotherm model. DFT calculations go along with the experimental results, signifying the potential corrosion inhibition behaviour of DMHB for MS in both the acid media

Item Type: Article
Uncontrolled Keywords: Mild steel · Impedance · Physisorption · Langmuir isotherm
Subjects: Engineering > MIT Manipal > Chemical
Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 15 Jul 2021 08:40
Last Modified: 15 Jul 2021 08:40

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