Abstract
Aluminum alloy sheet materials are protected by cladding and subsequently anodizing them, while extrusions are protected by anodizing. The oxide film formed in the latter case effectively protects DI6T material against corrosion fatigue and also raises its fatigue strength in air [i]. Cladding, however, protects this material only very slightly against corrosion fatigue and reduces its fatigue resistance in air. Moreover, the cladding layer has been found to reduce considerably the beneficial effect of anodizing on the fatigue strength of DI6T material in air and in a corrosion medium [2].
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