Experimental Evolution of Curvature with Substrate and Alumina Thicknesses on Aluminum Anodizing

Zoubai Elhadi; A. Raid; V. Fridrici; P. Christophe; N. Boualem; Ph. Kapsa

doi:10.15866/ireme.v14i3.17875

Experimental Evolution of Curvature with Substrate and Alumina Thicknesses on Aluminum Anodizing

Zoubai Elhadi^(1*), A. Raid⁽²⁾, V. Fridrici⁽³⁾, P. Christophe⁽⁴⁾, N. Boualem⁽⁵⁾, Ph. Kapsa⁽⁶⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v14i3.17875

Abstract

In this paper, the evolution of damage when curving a substrate with an alumina layer has been studied. A sample preparation method has been used, so that substrate is free from any stress due to the adhesive insulation during the anodization of one side. The curvature evolution as a function of alumina layers thickness from 50 to 200 μm on aluminum substrates from 0.5 to 1.4 mm thick has been observed. Crack initiations start around film defects and spread transversely and longitudinally to eventually intersect. SEM examination of the anodized layers has shown that the stresses involved by curving create cracks up to 3 μm wide to provide accommodation of substrate-coating assembly. An approach has been adopted to describe the different stages of defects appearance with respect to stresses evolution. Due to internal stress effects, cracks continue to propagate and secondary ones are created in order to release the stored elastic energy in the interface substrate-alumina.
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Keywords

Alumina; Anodization; Curvature

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References

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