Effect of anodization and loading on fatigue life of 2618-T851 aluminum alloy
Résumé
Anodizing process is largely performed on
aluminum alloys to enhance corrosion and wear
resistances. However, this process can significantly
reduce the fatigue resistance of aluminum alloys
depending on the alloy and the process parameters.
This paper deals with the influence of anodizing
process on fatigue resistance of the aeronautical
aluminum alloy 2618-T851. The anodic film has been
characterized after each step using scanning electron
microscopy (SEM). This analysis showed that the
anodic layer was crazed just after impregnation
operation with micro-cracks extending from the
surface up to half the anodic layer. Simultaneously,
uniaxial fatigue tests under tension or torsion loadings
have been conducted in order to evaluate the effect of
each process step in relation with loading nature. The
results showed that the anodizing step has a detrimental
effect on fatigue life of 2618 alloy when specimens
are subjected to tensile loading. However, anodizing
process has no effect on fatigue life under torsion
loading. Fractographic observations have been conducted
in order to get an insight on the mechanisms
involved in each case.
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