Abstract
The present study has been conducted in order to investigate the coupled effects of substrate microstructure and the sulphuric acid anodizing process, on the fatigue life of a 2017A aluminum alloy, by means of plane bending fatigue tests (R = − 1). The effect of two different tempers, namely artificially aging (T6) and recovery annealing, prior to anodizing, was studied. The microstructural analysis of the substrate and anodic films was carried out by means of different techniques. It has been determined that the anodic film gives rise to a decrease in the fatigue properties of the heat treated alloy at all stress levels. However, at low stresses, the reduction in fatigue life is more pronounced for the annealed material. The effect of substrate microstructure on the morphology of the anodic layer and on the reduction of the fatigue life of the alloy is also discussed.
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