Anti-Corrosive effect of N-((benzylidene hydrazino)-propyl)- benzotriazole and N-((4-oxo-2-phenyl-1,3-thiazolidineimino)-propyl)-benzotriazole for admiralty brass in marine environment

Benzotriazole derivatives, namely N-[(benzylidene hydrazino)-propyl]benzotriazole(BPBT) and N-[(4-oxo-2-phenyl-1,3-thiazolidineimino)-propyl]benzotriazole (OPBT) were synthesised and their inhibition behaviour on admiralty brass in artificial sea water were investigated by the weight-loss method and potentiodynamic polarisation methods. Benzotriazole derivatives were found to act as mixed type inhibitors. Of the compounds studied, OPBT exhibited the best performance, giving more than 94% inhibition efficiency in artificial sea water. Solution analysis revealed the dissolution of both copper and zinc occurred in the presence of the inhibitors. The morphology of the brass after corrosion in the presence and absence of the BTA derivatives was examined using scanning electron microscopy (SEM). The percentage composition of the brass surface was analyzed using energy dispersive X-ray analysis (EDAX).