Electrical behaviour, characteristics and properties of anodic aluminium oxide films coloured by nickel electrodeposition

  • Arurault L
  • Zamora G
  • Vilar V
 et al. 
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Porous anodic films on 1050 Al substrate were colored by a.c. electrodeposition of Ni. Several expts. were performed at different deposition voltages and Ni concns. in the electrolyte to correlate the applied elec. power to the elec. behavior, as well as the characteristics and properties of the coatings. The content of Ni inside the coatings reached 1.67 g/m2, depending on the exptl. conditions. According to the applied a.c. voltage in comparison with the threshold voltage Ut, the coating either acted only as a capacitor when U < Ut and, when U > Ut, the behavior during the anodic and cathodic parts of the power sine wave was different. In particular, due to the semi-conducting characteristics of the barrier layer, addnl. oxidn. of the Al substrate occurred during the anodic part of the elec. signal, while metal deposition (and solvent redn.) occurred during the cathodic part; these mechanisms correspond to the blocked and pass directions of the barrier layer/electrolyte junction, resp. [on SciFinder(R)]

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