Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 11, Pages C399-C407Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3490640
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Funding
- Engineering and Physical Sciences Research Council (U.K.)
- European Community [FP7/2007-2013, PIEF-GA-2008-219913]
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
- EPSRC [EP/H020047/1] Funding Source: UKRI
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(18)O 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 (18)O ions of a preformed oxide are retained in the film during anodization in a nonenriched electrolyte, with (18)O 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. (c) 2010 The Electrochemical Society. [DOI: 10.1149/1.3490640] All rights reserved.
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