Abstract
The behaviour of 70Cu-30Ni commercial alloy in quiescent sulphide polluted and unpolluted sea water at 25°C was examined by free corrosion and electrochemical tests. In aerated sea water the presence of sulphides enhances the average corrosion rate in a range of concentrations (0–10 ppm) while promoting preferential copper dissolution. In de-aerated sea water, alloy corrosion behaviour is strictly linked to sulphide concentration. In low polluted sea water, the mean corrosion rate of the alloy increases and slightly selective copper dissolution takes place. In highly polluted sea water, the corrosion rate decreases while slightly selective nickel dissolution takes place.
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