Eur. Phys. J. Appl. Phys. 93, 21301 (2021)
https://doi.org/10.1051/epjap/2021200229

Regular Article

An experimental and theoretical correlation of inhibition effect of some dihydropyridine on mild steel in 1 M HCL^★

¹ Laboratoire de Chimie Physique des Matériaux LCPM, Faculté des Sciences Ben M’sik, B. P. 7955, Bd Cdt Driss El Harti, Université Hassan II de Casablanca, Casablanca, Morocco
² Centre Régional des métiers d'éducation et de formation Casablanca Anfa, Bd Bir Anzarane, Casablanca, Morocco

^* e-mail: alfahimismail@yahoo.fr

Received: 10 July 2020
Received in final form: 17 December 2020
Accepted: 4 January 2021
Published online: 8 February 2021

Abstract

The corrosion inhibition of mild steel in 1 M HCl solution by some dihydropyridine has been studied using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization techniques and quantum chemical study. The results of weight loss and Tafel polarization measurements showed that among the studied compounds, Isradipine has good inhibiting properties for steel corrosion in acidic bath, with 98% inhibition efficiency at optimum concentration 400 ppm. The inhibition is of a mixed anodic–cathodic nature. The adsorption behaviour of the investigated compounds is found to obey Langmuir adsorption isotherm. Quantum chemical parameters were correlated with the experimental results.