Paper Title:

Graded Anodic Film Morphologies for Sustainable Exploitation of Aluminium Alloys in Aerospace

Periodical Advanced Materials Research (Volume 38)
Main Theme Corrosion in the Military II
Edited by Vinod Agarwala, Francesco Bellucci, Mario Montuori and Juliet Ippolito
Pages 48-55
DOI 10.4028/www.scientific.net/AMR.38.48
Citation Michele Curioni et al., 2008, Advanced Materials Research, 38, 48
Online since March 2008
Authors Michele Curioni, Peter Skeldon, George E. Thompson, John Ferguson
Keywords Aerospace, Anodizing, Corrosion, Morpholoy, Potentiodynamic
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High strength aluminium alloys are widely used in the civil and military aerospace industry due to their low weight and high mechanical properties, achieved by selected alloying elements and heat treatments. The resulting multiphase alloy system, a solid solution of alloying elements in the aluminium matrix and a variety of second phase material, requires specific anticorrosion measures in order to prevent localized corrosion, which is promoted by microgalvanic coupling between the different metallographic phases. Traditionally, the anticorrosion performances are achieved by chromic acid anodizing (CAA), followed by painting. However, environmental issues and associated costs for the disposal of chromate wastes, require the development of new approaches for anodizing of aluminium alloys. In this work, the potential for tailoring the porous anodic film morphology through the film thickness by controlled variations of the anodizing potential is inspected. The procedure developed is, in principle, applicable to any aluminium alloy in any anodizing electrolyte and results in the generation of innovative graded porous anodic film morphologies which promise improvement of anticorrosion properties and replacement of CAA .

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