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The enrichment of copper alloying additions near the surface of sputtering-deposited Al–1.3at.%Cu, Al–2.7at.%Cu and Al–30at.%Cu alloys is investigated following immersion in nitric acid, which is used commercially as a de-smutting pre-treatment. Corrosion of the alloys is revealed at rates in the range 4–13nmmin −1 , leading to enrichment of copper in the alloy surface regions. Enrichments...
Metastable, solid-solution Mg-0.8at.% Cu and Mg-1.4at.% Zn alloys have been anodized up to 250V at 10mAcm -2 in an alkaline phosphate electrolyte at 293K in order to investigate the enriching of alloying elements beneath the anodic films. Rutherford backscattering spectroscopy (RBS) revealed enrichments to about 4.1x10 15 Cu atoms cm -2 and 5.2x10 15...
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