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Yes, anodizing *does* increase the strength of aluminum. To go scientific for a moment: aluminum's surface strength is due to the surface oxidation of the metal (aluminum oxide is extremely strong). Anodizing uses electricity to augment the normal oxidation, making the top layer of aluminum oxide even thicker, thus protecting the aluminum that much better.
2fast: you yourself said "in order to coat with a protective or decorative film," yet you immediately follow with saying you don't think it makes the aluminum stronger. Anodizing the surface of aluminum does strengthen the surface in a noticeably way. Do you not consider this to be stronger? I mean, you put a thick layer of what is very similar in chemical composition to a ruby on top of the metal, and all your getting is a nice look?
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