The oxide films formed on zirconium and some of its alloys during corrosion in steam and water at 325°C have been studied by impedance measurements made by immersion in an electrolyte. A fall in the protective character of the film is accompanied by an increase of capacity, and measurements of the latter provide a useful method of comparing films. The behavior of the resistive part of the impedance and the influence of frequency and electrolyte conductivity are complex, and only a partial interpretation can be given.
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Wanklyn et al. (1958) studied this question.