3,5-bis(n-hydroxyphenyl)-4-amino-1,2,4-triazoles and 3,5-bis(n-aminophenyl)-4-amino-1,2,4-triazoles: a new class of corrosion inhibitors for mild steel in 1 M HCl medium

A new class of corrosion inhibitors, namely, 3,5-bis(n-hydroxyphenyl)-4-ami no-1,2,4-triazoles and 3,5-bis(n-aminophenyl)-4-amino-1,2,4-triazoles which have been labelled n-HPAT and n-APAT has been synthesized. The influence o f aminotriazoles on the corrosion of mild steel in 1 M HCl has been studied using weight loss and electrochemical impedance spectroscopy. Results obta ined show that these compounds are very good anodic inhibitors. The adsorpt ion of these aminotriazoles is found to obey Langmuir adsorption isotherm.