Abstract
The conditions under which anodic oxide films on tantalum showed electronic conductivity were studied using an electrochemical printing‐out technique with starch‐iodide as the redox indicator. The sensitivity for the detection of electronic charge was approximately 1 millicoulomb/cm2. The effect of alloying (contamination), thermal oxidation, plastic deformation, and surface topography were investigated with regard to their contribution to the electronic conductivity of anodic oxide films on mechanically treated (“rough”) tantalum surfaces. It was concluded that impurities alone were responsible for the electronic conductivity even in cases where supposedly clean tantalum had been abraded with tantalum. Roughness by itself was not a sufficient condition for electronic conductivity.
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