Research of EIS on coated metals in general has been investigated
by Leidheiser [1] amongst others since the 70s. The review
by Murray [2–4] gives a good overview of the field. The approach
of each author is slightly different, depending on how the objective
was precisely formulated. Most researchers focus on the
performance of the coating and/or the substrate, including any passivation
treatments. Those tests are done on flat panels, to remove
experimental complications.