Anodizing technology was widely applied to the surface treatment of aluminium and its alloys to improve their mechanical properties and corrosion resistance. Anodic films on aluminum alloys have excellent heat-resistance performance. However, because the difference between thermal expansion coefficients of anodic films and the substrate aluminum alloys, internal stress may be induced by thermal cycles and micro-cracks may occur in the films, which leads to decreases of thermal fatigue resistance and c...