ANTICORROSION FILM OF BENZIMIDAZOLE ON BRASS IN AMMONIA

Benzimidazole (Hbz) forms a highly stable insoluble film impeding diss olution of brass ill ammonia. It is a mixed inhibitor, inhibiting prim arily by blocking the reaction centres. Rise of temperature favours co rrosion, but to a much lesser extent in presence of inhibitors, becaus e of chemisorption, leading to a net increase in inhibition efficiency . From ir and electronic spectral measurements, the anticorrosion film has been ascribed to formation of bis-benzimidazolato complexes of Cu -II and Zn-II.