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*18 Oxygen Tracer Study of Porous Film Growth on Aluminum in Phosphoric Acid.

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JES 18O tracer is used to investigate the development of porous anodic films at constant current in phosphoric acid on electropolished aluminum. A barrier layer and porous region form initially with the pore size related to the surface texture of the substrate. Subsequently, major pores emerge, with their sizes related to the anodizing voltage. The evolution of the film is accompanied by increases in growth rate and formation efficiency. The 18O ions of a preformed oxide are retained in the film during anodization in a nonenriched electrolyte, with 18O being partitioned among (i) the surface region of texture-dependent porosity, (ii) the walls of major pores, and, in diminishing amounts, (iii) the inner region of the barrier layer.