Synthesis and Characterization of Some Novel Thiazole Derivatives and Their Applications as Corrosion Inhibitors for Zinc in 1 M Hydrochloric Acid Solution

Abstract

The influence of corrosion inhibition of some thiazole derivatives, namely: 2-(3,5-dimethyl-4-(p-tolyldiazenyl)-1H-pyrazole-1-yl)thiazol-5(4H)-one, 2-(3,5-dimethyl-4(phenyldiazenyl)-1H-pyrazole-1-yl)thiazol-5(4H)-one, and 2-(4-((4-chlorophenyl)diazenyl)-3,5-dimethyl-1H-pyrazole-1-yl)thiazol-5(4H)-one on Zn in 1.0 M HCl solution was studied by utilizing electrochemical and non-electrochemical tests. The obtained data without and with these derivatives were utilized to measure the protection efficiency (η %) which rises with the rise in the concentration of these derivatives. The phenomenon of physical adsorption was proposed and inhibitors adsorption was established to adapt Langmuir adsorption isotherm. Polarization data clearly indicated that these derivatives behaved as mixed inhibitors.