Abstract
Impedance spectroscopy was employed to study anodic oxide films at the interface at 1000°C and 1 atm using a standard polarization cell with an alumina‐sheathed Pt, , reference electrode and a platinum counterelectrode. This system does not anodize easily; in most samples the anodic current was shunted through nodules that formed on the surface of the aluminided nickel specimens. Impedance behavior of successfully anodized samples in molten sodium carbonate at the rest potential was consistent with the continued growth of barrier‐type at short times (<25 h) and with the formation of a porous layer for longer times (>45 h).
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