Bis-aminoazoles corrosion inhibitors for copper in 4.0 M HNO3 solutions

Abstract The efficiency of two newly developed organic compounds of the triazoles type namely: bis [4-amino-5-hydroxy-1, 2, 4-triazol-3-yl] methane ‘compound D 1 ’ and bis [4-amino-5-hydroxy-1, 2, 4-triazol-3-yl] butane ‘compound D 2 ’ as corrosion inhibitors for copper in 4.0 M HNO 3 solutions at 25°C was investigated using both weight loss and galvanostatic polarization techniques. The results showed that the predominant action of the inhibitors was cathodic. The two inhibitors proved to be effective (>99%) with long term effectiveness. Galvanostatic polarization measurements confirm weight loss measurements.