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In any consistent electrochemical systems model that addresses more than oneinterface, the total current at the interfaces should be equal to one anotherand to the current in the external circuit. The point defect model of Macdonaldand co-workers fails to recognize this basic requirement. Hence there is noassurance that currents predicted by the PDM will be the same at the metal/filmand the film/solution interfaces. This deficiency is corrected in the presentwork. Besides, The point defect model lacks a proper book-keeping of ion andelectron currents and in particular missed the role of a purely electronchannel (e-channel) at the metal/film interface [1]. In this work we describethis book-keeping, include the e-channel and show how this affects the forms ofthe metal-film and film-solution potential drops.

Book-keeping of Ion and Electron Currents in the Point Defect Model and  Role of an Electron Channel at the metal/film Interface in Determining the  Forms of the metal-film potential and the film-solution potential drops