Mechanism of Dezincification and the Inhibitive Efficiency of some Azoles for the Corrosion of 70/30 Brass in Sulphuric Acid

Abstract

A study has been made of the mechanism of dezincijication of α-brass and the effect of azoles as inhibitors for the corrosion of 70/30 brass in sulphuric acid using the weight loss method, solution analysis and electrochemical techniques. The inhibitive efficiency of azoles for the corrosion of α-brass has been found to decrease in the order: 2-mercaptobenzothiazole > benzotriazole > benzimidazole. The critical current density and corrosion current decrease in the same order as the increase in inhibitive efficiency of the compounds. Potentiostatic polarisation studies have shown that both cathode and anode are polarised indicating a mixed type of inhibition.