Investigations into the coefficient of thermal expansion of porous films prepared on AA7175 T7351 by anodizing in sulphuric acid electrolyte

Yann Goueffon 1 Catherine Mabru 2 Michel Labarrère 2 Laurent Arurault 3 Claire Tonon 4 Pascale Guigue 1
1 CNES - Centre National d'Etudes Spatiales - Direction Des Lanceurs.
2 ICA - Institut Clément Ader
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 Astrium [Toulouse]
Abstract : The aim of this study was to investigate the Coefficient of Thermal Expansion (CTE) of anodic films on 7175 T7351 aluminium alloy and to evaluate the influence of the film characteristics on this value. In particular, effects of porosity and post-treatments, such as coloring and sealing, were studied. Beam bending analysis was used as the experimental method and a numerical finite element model was developed to verify theoretical relationships hypotheses. The values determined and the choice of experimental method were then validated by comparing the experimental cracking temperature of anodic films with a theoretical value directly depending on the previously determined CTE.
Keywords : Aluminium alloy Thin film Coefficient of thermal expansion Anodic film Cracking
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Yann Goueffon, Catherine Mabru, Michel Labarrère, Laurent Arurault, Claire Tonon, et al.. Investigations into the coefficient of thermal expansion of porous films prepared on AA7175 T7351 by anodizing in sulphuric acid electrolyte. Surface and Coatings Technology, Elsevier, 2010, 205 (7), pp.2643-2648. ⟨10.1016/j.surfcoat.2010.10.026⟩. ⟨hal-01852313⟩

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