Aluminum oxide layer
Aluminum oxide layer
(OP)
Hello, I would like to ask a few things about aluminum: the protective oxide layer that forms spontaneously in contact with air, in the absence of corrosive agents,in normal room temperature, no water or mechanical actions, remains unchanged over time, continuing to protect the underlying aluminum for an indefinite time?
I mean, if nothing breaks the barrier, can aluminum hypothetically be protected “forever”?
I mean, if nothing breaks the barrier, can aluminum hypothetically be protected “forever”?
RE: Aluminum oxide layer
https://www.youtube.com/watch?v=jeghGhVdt9s
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RE: Aluminum oxide layer
RE: Aluminum oxide layer
A little oil or grease, even finger prints is all that it takes.
If it is the correct Al alloy as Tug says it is better left bare.
The wrong alloy and it never stands a chance.
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RE: Aluminum oxide layer
RE: Aluminum oxide layer
If you keep the parts in a climate controlled environment three effects will be minimized.
Do note that many cars come with polished aluminum wheels. They have a clear coat finish applied to them. It's quite durable (lasts 10-20 years) but if it's ever damaged crevice corrosion will cause pitting. It can always be removed and re-applied as with most coatings.
RE: Aluminum oxide layer
RE: Aluminum oxide layer
I see bicycle components all of the time that people have polished because they think that looks neat.
If it is a part that you can keep touching up then fine.
But parts with lots of hidden areas and high probability of getting dirty and wet it isn't a good idea.
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P.E. Metallurgy, consulting work welcomed
RE: Aluminum oxide layer
A user here mentioned hydration as a cause of adhesive failure recently. They mentioned a treatment to prevent this (proprietary). I speculate that silanes could be used to treat the surface between abrasive blasting and painting for a more durable coating.
RE: Aluminum oxide layer
TTFN (ta ta for now)
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RE: Aluminum oxide layer
RE: Aluminum oxide layer
Crevice corrosion doesn't occur under the paint, it occurs at the paint/aluminum/air interface. It starts at a hole or break the coating and then propagates from there.
RE: Aluminum oxide layer
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P.E. Metallurgy, consulting work welcomed
RE: Aluminum oxide layer