A study on use of Telmisartan drug for corrosion inhibition of zinc in 0.1M hydrochloric acid: Surface characterization and Quantum studies

Abstract

Corrosion inhibition property of Telmisartan on zinc in 0.1 M HCl medium was investigated by chemical and electrochemical techniques. Inhibition action of Telmisartan was found to be increased with increase in concentration and decreased with raise in temperature. Maximum inhibition efficiency of 77% was observed at 20 ppm inhibitor concentration. Inhibition action of inhibitor is due to adsorption on zinc metal surface and it follows the Langmuir adsorption isotherm. Influence of temperature on inhibition action of Telmisartan was studied through activation parameters. Surface morphology of zinc surface with and without inhibitor was examined through SEM and EDX. Surface roughness was studied by AFM and contact angle measurement techniques. FTIR spectral studies confirmed the protecting nature of Telmisartan on zinc corrosion. Quantum chemical data were calculated to prove its suitability as a corrosion inhibitor and to describe the effective adsorption of Telmisartan molecule.