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Behaviour of hydrogen impurity in aluminium alloys during anodizing |
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| Authors: | L. Iglesias-RubianesP. Skeldon G.E. ThompsonU. Kreissig D. GramboleH. Habazaki K. Shimizu |
| Affiliation: | a Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, P.O. Box 88, Manchester M60 1QD, UK b Forschungszentrum Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, P.F. 510119, 01314 Dresden, Germany c Graduate Engineering School, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan d University Chemical Laboratory, Keio University, 4-1-1 Hiyoshi, Yokohama 223, Japan |
| Abstract: | The present study examines the behaviour of hydrogen impurity in an Al-6.5 at.% W alloy during anodizing, using elastic recoil detection and nuclear reaction analyses. Increased concentrations of hydrogen are found near the alloy/anodic film interface, amounting to ∼2×1015 H atoms cm−2 for the particular alloy, containing 0.1-0.3 at.% hydrogen in the bulk regions, and conditions of anodizing. The enrichment arises from hydrogen in the alloy (i) diffusing to the interface, which acts as a trap, or (ii) accumulating at the interface, due to the growth of the anodic film, or a combination of both processes. Diffusion is consistent with the known mobility of hydrogen in aluminium near ambient temperature. Further, accumulation, and subsequent oxidation, of hydrogen are expected based on the general behaviour of alloying elements in anodized aluminium. The anodic films contained ∼0.1-0.3 at.% hydrogen, originating from either the electrolyte or the alloy. |
| Keywords: | Anodic oxidation Aluminium Hydrogen Nuclear reaction analysis |
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