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Passivation of Al–Cr–Fe and Al–Cu–Fe–Cr complex metallic alloys in 1 M H2SO4 and 1 M NaOH solutions

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author E. Ura-Binczk N. Homazava A. Ulrich R. Hauert M. Levwandowska K.J. Kurzydlowski P. Schmutz,
Project MICORRANA II - Development of a hyphenated online-technique for spatially resolved chemical element analysis of micro corrosion processes
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Original article (peer-reviewed)

Journal Corrosion Science
Volume (Issue) 53
Page(s) 1825 - 1837
Title of proceedings Corrosion Science
DOI DOI: 10.1016/j.corsci.2011.01.061

Abstract

The corrosion mechanisms of Al-Cr-Fe and Al-Cu-Fe-Cr complex metallic alloys have been investigated by potentiodynamic and potentiostatic polarization. Very good passivation of the Al-Cr-Fe surface is exhibited from 1 M H2SO4 to 1 M NaOH solutions, which was confirmed by ICP-OES analysis over a period of 273 days. Potentiostatically formed passive films analysed by XPS revealed chromium enrichment in the outermost layer of the aluminium oxy-hydroxide film. Although Al-Cu-Fe-Cr showed passivation during potentiodynamic polarization, heavy active corrosion at OCP was revealed by ICP-OES. For the Al-Cu-Fe-Cr alloy, the 10% content of Cr is insufficient to maintain a protective "chemically stable" Cr oxide/hydroxide. (c) 2011 Elsevier Ltd. All rights reserved.
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