Anodic Oxidation of Zirconium: Evidence of Typical Valve Metal Behavior

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Abstract
The anodic oxidation of zirconium in dilute sodium carbonate solution was studied by steady‐state and transient electrical techniques. An in situ ellipsometric method was employed to determine the oxide thickness. The electrical characteristics of the anodization process were found to be similar in most respects to those observed with other valve metals. For growth at constant current, the field in the anodic oxide was found to be independent of oxide thickness, and on suddenly changing the applied current typical voltage transients were observed. The relation between the ionic migration processes involved in the growth of the anodic oxide film and the electrical behavior of the system is discussed.

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