Abstract
The cathodic and anodic behaviour of copper in tap water at pH values of 5, 7 and 9 has been studied at 50 ± 1°C in the presence of different concentrations of 2-amino-thiazole (ATZ) and 2-amino-4,6-dimethyl-pyrimidine (ADMP). The chemical nature of the complex formed between copper and ATZ or ADMP has been found in acidic solution to be a Cu(II) complex and to a lesser extent Cu(I) complex. The concentration of Cu(I) complex seems to increase as the solution becomes more basic. Polarization studies of the inhibition process suggest that the surface of the copper in both cases is largely covered by the complex.
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