A new corrosion inhibitor, namely, 3,5-bis(2-thienyl)-4-amino-1,2,4-triazol
es (2-TAT) has been synthesised and its inhibiting action on the corrosion
of mild steel in acid baths (1 M HCl and 0.5 M H2SO4) has been investigated
by various corrosion monitoring techniques, such as corrosion weight loss
tests and electrochemical impedance spectroscopy. The electrochemical study
reveals that this compound is an anodic inhibitor. Changes in impedance pa
rameters (R-t and C-dl) are indicative of the adsorption of 2-TAT on the me
tal surface, leading to the formation of a protective film which grows with
increasing exposure time. 2-TAT is able to reduce the steel corrosion more
effectively in IM HCl than in 0.5 M H2SO4. The adsorption of this inhibito
r is also found to obey the Langmuir adsorption isotherm in both acids. 2-T
AT is considered as a non-cytotoxic substance. (C) 1999 Elsevier Science Lt
d. All rights reserved.