Russell,
 Hydrogen embrittlement is more of a problem
on steel parts than aluminum. The problem on
Al is making it stick!
Bill Jepson

Maybe they were merely polished.

Paul Lamar

Aviation chrome on al calls for a copper coating first, then the chrome.
I had some prop spinners done that way. [Marc Wiese]

You are way behind on your reading marc :)

Paul Lamar
 
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