Abstract
The behaviour of copper in alkaline aqueous solutions (pH 12) containing inorganic anions such as hydroxides, fluorides, chlorides, bromides, iodides, sulphates, perchlorates, carbonates and phosphates has been investigated by the a.c. impedance technique over a wide frequency range (100 kHz - 10 mHz). The experimental data were approximated by five equivalent circuits and the parameters of the two models that the results fitted best are presented. The impedance of copper was measured at three constant potentials and as a function of the exposure time. The results give valuable information about the properties of copper surface layers and their corrosion resistance.
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