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Combined Role of Trace Elements Pb and Sn in Low Temperature Activation of Aluminum

By Köksal Kurt, A John C. Walmsley, C Spyros Diplas and Kemal Nisancioglua


Anodic activation of aluminum alloys is defined as the significant negative shift observed in the breakdown potential and significant temporary increase in the anodic current output in the potential range in which the alloy is expected to be passive. The role of Pb, as a common trace element, in activating aluminum alloys in chloride solution has frequently been discussed during the past decade, as reviewed in Ref. 1. Activation by Pb occurs by segregation of a few nanometers thick Pb-rich metallic film at the metal-oxide interface as a result of heat treatment at 600°C, which leads to passivity breakdown at a reduced potential.2 Significance of the phenomenon on filiform corrosion (FFC) of Al alloy AA8006 has also been discussed.3 An unanswered issue has been the activation o

Year: 2016
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