Aluminum Corrosion: How Long Will It Last?

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SUMMARY

Aluminum corrosion is significantly mitigated by the formation of aluminum oxide, which creates a protective patina that prevents further degradation. Historical evidence from WWII-era aircraft wreckage in Pacific jungles demonstrates that aluminum components can remain in excellent condition for over sixty years with minimal maintenance. The oxide layer, being one of the hardest materials, does not flake off like rust, ensuring the longevity of aluminum structures. The discussion raises questions about the ultimate lifespan of aluminum in harsh environments, but current observations indicate remarkable durability.

PREREQUISITES
  • Understanding of aluminum oxidation processes
  • Knowledge of corrosion resistance mechanisms
  • Familiarity with materials science principles
  • Awareness of environmental impacts on metal longevity
NEXT STEPS
  • Research the properties of aluminum oxide and its protective qualities
  • Explore case studies of aluminum structures in marine and tropical environments
  • Investigate corrosion prevention techniques for aluminum alloys
  • Learn about the effects of environmental factors on metal degradation
USEFUL FOR

Materials scientists, aerospace engineers, conservationists, and anyone interested in the longevity and preservation of aluminum structures in various environments.

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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