I have bought a zinc sheet and with SEM I can see a ZnO layer, which is a passivity layer. But when I connect this sheet to a conductive wire, le zn sheet is conductive too. Is that normal ? the ZnO layer should prevent the Zn/wire connection from, isn't it ?

  • $\begingroup$ Depends how thick the ZnO is, how the wire is attached, and how closely you look at the behavior of the junction. $\endgroup$ – Jon Custer Nov 8 '16 at 17:02
  • $\begingroup$ Bear in mind that ZnO is a semiconductor. It is a wide band gap semiconductor. Nevertheless, it is a poor choice as an insulating layer. More so if it the layer is thin. $\endgroup$ – CoffeeIsLife Nov 8 '16 at 17:15

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