The Nature of the Passive Film on Iron: II . A‐C Impedance Studies

Abstract

The passive film on iron in borate buffer has been studied with wide frequency range impedance techniques. Two well‐defined potential domains are observable, i.e., above and below 1.0V vs. the reversible hydrogen electrode in the same solution (RHE). A discussion of the interpretation of electrochemical impedances and of interfering artifacts is presented. An analysis of the impedance curves raises serious questions about the interpretation of the data in terms of a semiconductor model.