Improving corrosion inhibition potentials using two triazole derivatives for mild steel in acidic medium: Experimental and theoretical studies

• Published in: Materials today : proceedings Vol. 13; pp. 920 - 930
• Main Authors: Merimi, I., EL Ouadi, Y., Benkaddour, R., Lgaz, H., Messali, M., Jeffali, F., Hammouti, B.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2019
• Subjects: Corrosion inhibition; electrochemical techniques; Epzc; Mild steel; optical microscopy; Theoretical study; Weight loss; Mild steel; Epzc; optical microscopy; Weight loss; Theoretical study; Corrosion inhibition; electrochemical techniques
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2019.04.056

Electrochemical measurements as well as the weight loss method were investigated to determine the mechanism and performance of inhibition of (Z) -4 - ((2-bromobenzylidene) amino) -5-methyl-2-4-dihydro -3H-1,2,4-triazole-3-thione (2i) and (Z) -4 - ((3-bromobenzylidene) amino) -5-methyl-2-4-dihydro-3H-1,2,4 -triazole-3-thione (21) for the corrosion of mild steel in 1.0 M HCl. the outcomes show that the two triazole derivatives act as good inhibitors, and the efficiency of the inhibition follows the order (2i)>(21). Both derivatives are mixed inhibitors and adsorb on the metal surface according to the Langmuir model. An optical microscopy study points out an improved morphology of the surface of mild steel in the presence of the inhibitor studied. The inhibition mechanism was explored by the potential of the zero charge (Epzc) at the solution / metal interface. Dynamic simulation indicates the possibility of progressive substitution of water molecules on the surface of the iron surface. Thermodynamic and kinetic parameters were calculated and discussed. The quantum chemical parameters are calculated using the GAUSSIAN09W suite a good correlation between theoretical and experimental results has been shown.