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Characterization of Electrochemically Activated Surface on Rolled Commercial AA8006 Alumnium

Published online by Cambridge University Press:  01 February 2011

Yingda Yu ,
Øystein Sævik ,
Jan Halvor Nordlien  and
Kemal Nisancioglu
Yingda Yu
Affiliation:
Department of Materials Technology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
Øystein Sævik
Affiliation:
Department of Materials Technology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
Jan Halvor Nordlien
Affiliation:
Hydro Aluminium R&D Materials Technology, N-4256 Håvik, Norway
Kemal Nisancioglu
Affiliation:
Department of Materials Technology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
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Abstract

Commercial alloy AA8006 (nominal composition in wt%1.5Fe, 0.4Mn, 0.2Si) exhibits electrochemical activation in chloride media as a result of annealing at temperatures above 350°C. Activation is manifested by a significant negative shift in the corrosion potential and a significant increase in the anodic current when polarized above the corrosion potential in aqueous chloride solution. This phenomenon was correlated with the enrichment of trace element Pb at the oxide-metal interface. For fixed annealing time, maximum activation and Pb-enrichment are obtained at an annealing temperature of 450 °C independent of the original surface condition. Reduced activation with increasing temperature is attributed to increasing density of the spinel crystalline phase to cause the passivity of the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T3.43
Copyright
Copyright © Materials Research Society 2005

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References

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