Enhancement of corrosion protection efficiency of mild steel by 3,5-di(4-tolyl)-4-amino-1,2,4-triazole in hydrochloric acid medium

Abstract

New 3,5-disubstituted-4-amino-1,2,4-triazole derivative, namely 3,5-di(4-tolyl)-4-amino-1,2,4-triazole
(4-DTAT) was synthesised and its inhibitive action against the corrosion of mild steel in 1 M HCl solution was investigated at 308 K. The detailed study of 4-DTAT was been performed using gravimetric measurements and polarisation curves method. Results show that 4-DTAT is a good inhibitor and its inhibition efficiency reaches 95 % at·10⁻⁴ M. Tafel polarisation study revealed that 4-DTAT acts as a mixed type inhibitor. The adsorption of 4-DTAT on steel surface obeyed Langmuir’s adsorption isotherm. The inhibitor adsorption process in mild steel/4-DTAT/hydrochloric acid system was studied at different temperatures (308-323 K) by means of weight loss measurements.