Adsorption and inhibitive impact of 5-(2-ethoxybenzylidene) 1,3-dimethylbarbituric acid on carbon steel corrosion in acid solution

Document Type : Original Article

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Department of Chemistry, Faculty of Science, Mansoura University, Mansoura

Abstract

The inhibiting impact of ecofriendly 5-(2-ethoxybenzylidene) 1,3-dimethylbarbituric acid (5-EBMB) in 1 M HCl on the corrosion of C-steel has been examined via weight loss (WL) method, potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) techniques. The attained outcomes exhibit that the investigated compound is excellent inhibitor and its inhibition efficiency (%IE) rises by rising concentration and temperature. The adsorption of the investigated derivative on the surface of C-steel follows Langmuir isotherm. The adsorption process of the investigated compound is spontaneous and considered as chemisorption type. PP curves revealed that the studied derivative is mixed-type inhibitor. Moreover, EIS results confirmed the adsorption of the investigated compound on C-steel surface via increasing on charge transfer resistance (Rct) and lowering in capacitance of double layer (Cdl). The IE% of the investigated derivative reached to 79.9% at concentration 21×10-6 M according to WL method. All tested methods gave good agreement.

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Mansoura Journal of Chemistry
Volume 55, Issue 1
February 2022
Pages 32-41

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