Airliner's aluminum anodized?

A

Av8rr

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av8r
Were all airliners that had unpainted metal back in the 50's and 60's anodized or was it bare aluminum?
 
Av8rr said:
Were all airliners that had unpainted metal back in the 50's and 60's anodized or was it bare aluminum?
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I'm no expert, but that's never stopped me before :)

Bare aluminum quickly develops a protective layer of oxidation just exposed to the environment. I would guess the surface of "bare" airliners are either bare with natural oxidation or perhaps clear-coated.

Anodizing is an electrochemical process used to increase the thickness of the natural oxide layer on the surface. I don't think that is ever used on aircraft skins.

Alodining is what you may be thinking of. Here is a nice site explaining it:
http://www.eaa1000.av.org/technicl/corrosion/alodine.htm
 
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