A Study of New benzo[d]thiazol Derivatives as Corrosion Inhibitors for Steel AISI 1035 in Acidic Medium

benzo[d]thiazol-2-ol (BAT), benzo[d]thiazol-2-amine (4-BAT) and benzo[d]thiazol-2-thiol (2-BAT) were prepared and investigated as corrosion inhibitors for AISI 1035 steel in 1 M HCl. It is found that 4-BAT functions as more effective inhibitor than other inhibitors. Computational chemistry studies show that derivatives can adsorb on the steel surface by sharing the lone pair electrons of N atoms with iron atoms or by accepting electrons from iron surfaces. Due to its strong interaction with the steel surface in aqueous system, the pyridine segment should be responsible for the higher inhibition efficiency of 4-BAT.