Investigation of corrosion inhibition of mild steel in 1M HCl by 3-methyl-4-(3-
methyl-isoxazol-5-yl)isoxazol-5(2H)-one monohydrate using experimental and
theoretical approaches

S. Lahmidi; H. Elmsellem; A. Elyoussfi; N. K. Sebbar1; E. M. Essassi; Y. Ouzidan; Y.
K; ri Rodi; K. Dguigui4; B. El Mahi; B. Hammouti

Abstract

Investigation of corrosion inhibition of mild steel in 1M HCl by 3-methyl-4-(3- methyl-isoxazol-5-yl)isoxazol-5(2H)-one monohydrate using experimental and theoretical approaches

Author(s): S. Lahmidi, H. Elmsellem, A. Elyoussfi, N. K. Sebbar1, E. M. Essassi, Y. Ouzidan, Y. Kandri Rodi, K. Dguigui4, B. El Mahi and B. Hammouti

The inhibition effect of 3-methyl-4-(3-methylisoxazol-5-yl)isoxazol-5(2H)-one monohydrate (P1) on the corrosion of carbon steel in 1 M HCl was studied by weight loss, electrochemical impedance spectroscopy (EIS) techniques and potentiodynamic polarization methods. The results showed that isoxazole P1 was a good inhibitor in 1 M HCl and inhibition efficiency increases with isoxazole P1 concentration to attain 93% at 10-3M at 308 K. E(%) values obtained from various methods used are reasonably good agreement. The adsorption of isoxazole P1 obeyed the Langmuir adsorption isotherm. Polarization curves showed that isoxazole P1 acted as a mixed-type inhibitor in HCl. The effect of the temperature on the corrosion behavior with addition of 10-3M of the inhibitor was studied in the temperature range 313-343 K, and the thermodynamic parameters were determined and discussed. In addition, a quantum chemical study suggests isoxazole P1 inhibitor is structurally essential for the protection of metal surface

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