Aluminum Corrosion: How Long Will It Last?

AI Thread Summary
WWII-era aircraft wreckage found in Pacific jungles has shown remarkable preservation, particularly of aluminum components, which remain in good condition after decades. The discussion highlights the formation of aluminum oxide on the surface, which acts as a protective layer, preventing flaking and corrosion like that seen with rust on iron. The conversation raises questions about the longevity of this protective oxide layer and how long aluminum structures can remain intact before they eventually degrade into alumina dust. The durability of aluminum in these environments suggests that, while some degradation may occur over time, the protective qualities of aluminum oxide significantly extend the lifespan of these aircraft components.
SkepticJ
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I've seen various documentaries where WWII-era aircraft wreckage has been sitting out in the jungles on Pacific islands for over sixty years and everything that is aluminum is in really good shape. Little bit of scrubbing the algae, mildew, and moss off of it, and it would look like new.

I know the surface oxidizes to form aluminum oxide, one of the hardest materials known, and the oxide isn't larger than the crystal structure of bulk aluminum, so it doesn't flake off like rust does. The patina protects the underlying metal.

What's the limit on this; how long, if ever, will it be before those aluminum wings, fuselages and floats corrode away into alumina dust?
 
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