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Título

Influence of pre-treatments in cerium conversion treatment of AA2024-T3 and 7075-T6 alloys

Autor De Frutos, A.; Arenas, M. A.; Liu, Y.; Skeldon, P.; Thompson, G.E.; Damborenea, Juan de ; Conde, A.
Palabras clave Cerium
Aluminium
Alloys
Conversion treatment
Enriched layers
Pre-treatment
Fecha de publicación 2008
EditorElsevier
Citación Surface and Coatings Technology 202: 3797-3807 (2008)
ResumenThe role of pre-treatment in the formation of a cerium conversion coating is investigated for the protection of AA2024-T3 and 7075-T6 alloys. The alloys were alkaline-etched and de-smutted in nitric acid, prior to cerium treatment in Ce(NO3)3 at 85 °C with H2O2 accelerator. Potentiodynamic polarization studies in 3.5% NaCl solution revealed a large shift of ∼ 300 mV of the corrosion potential below the pitting potential for the 7075-T6 alloy, which correlated with the development of a finely-textured, uniform coating. However, the formation of a uniform coating and protection was dependent upon the time of de-smutting, with non-uniform coatings resulting from extended times of de-smutting. In contrast, non-uniform coatings developed on the 2024-T3 alloy, with pitting potential at the corrosion potential, irrespective of the time of de-smutting. Findings for the 2024-T3 alloy indicate that extended de-smutting affects the enrichment of alloying elements. © 2008 Elsevier B.V. All rights reserved.
URI http://hdl.handle.net/10261/87807
DOI10.1016/j.surfcoat.2008.01.027
Identificadoresdoi: 10.1016/j.surfcoat.2008.01.027
issn: 0257-8972
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