The inhibitive action of some azoles towards the corrosion and dezincification of 70Cu30Zn brass in ammonia solution

Abstract

An attempt has been made to study the effect of some azoles on the corrosion and dezincification of 70Cu30Zn brass in ammoniacal solution using weight loss, solution analysis and potentiostatic polarization techniques. The inhibition efficiency of azoles for the corrosion and the dezincification of 70Cu30Zn brass has been found to decrease in the order benzimidazole > 2-mercaptobenzothiazole > benzotriazole. Benzimidazole has been found to give almost complete protection against corrosion as well as dezincification of 70Cu30Zn brass in ammoniacal solution. Potentiostatic polarization studies have shown that all the compounds inhibit both cathodic as well as anodic reactions, indicating a mixed type of inhibition. © 1983.