RESISTOMETRIC STUDY OF ANODIC OXIDE FILMS ON COPPER IN A NEUTRAL SOLUTION.

Conductance measurements were carried out on thin copper film electrode under galvanostatic polarization conditions in a neutral borate buffer solution of pH 8. 39, and the conductance- and potential-coulomb diagrams during the formation and reduction of surface oxides were obtained. Results revealed that the anodic oxide films on Cu were Cu//2O, CuO and Cu//2O//3. The amount of Cu//2O formed was almost independent of potential, except for a peak value at minus 0. 1 V. CuO was found to form at potentials more novle than 0. 0V and Cu//2O//3 more noble than 0. 6 V. The thickness of these two oxides increased with increasing potential.