Aluminum Corrosion: How Long Will It Last?

In summary, WWII-era aircraft wreckage in the Pacific islands has been found to still be in good condition after sixty years, with only some algae and mildew needing to be scrubbed off. The aluminum on the surface forms a protective layer of aluminum oxide, which prevents further corrosion and protects the underlying metal. The limit of this protection is unknown, as it is uncertain how long it will take for the aluminum to eventually corrode into alumina dust.
  • #1
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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Related to Aluminum Corrosion: How Long Will It Last?

What causes aluminum corrosion?

Aluminum corrosion is caused by a reaction between the metal and its surrounding environment. This reaction is typically triggered by exposure to oxygen and moisture, which causes the formation of aluminum oxide on the surface of the metal. Other factors that can contribute to aluminum corrosion include exposure to acidic or alkaline substances, high temperatures, and contact with other metals or materials.

How long does it take for aluminum to corrode?

The rate of aluminum corrosion can vary depending on the specific conditions it is exposed to. In general, aluminum can begin to corrode within a few hours of exposure to moisture and oxygen. However, the rate of corrosion can be slowed or accelerated by other factors such as temperature, pH level, and the presence of other metals.

What are the signs of aluminum corrosion?

One of the most common signs of aluminum corrosion is the formation of a white, powdery substance on the surface of the metal. This is known as aluminum oxide and is a byproduct of the corrosion process. Other signs may include discoloration, pitting, and flaking of the metal surface.

How can aluminum corrosion be prevented?

There are several steps that can be taken to prevent aluminum corrosion. These include applying protective coatings or finishes, using corrosion-resistant alloys, avoiding contact with other metals or corrosive substances, and ensuring proper maintenance and cleaning of aluminum surfaces.

Can aluminum corrosion be repaired?

In some cases, minor aluminum corrosion can be repaired by removing the affected area and applying a new protective coating. However, more severe corrosion may require replacing the damaged part or component. It is important to address corrosion as soon as it is noticed to prevent further damage and potential safety hazards.

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