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Author Topic: Metallurgy: mixing stainless and aluminum  (Read 714 times)

Offline pacomotorstuff

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  • Posts: 873
Re: Metallurgy: mixing stainless and aluminum
« Reply #10 on: Jan 28, 2018, 09:15:11 »
Marty,
That chart looks familiar - is it out of a FAA manual?
Question - aren't there suitable aluminum rivets for the project?
BTW, you folks that bolt carbon fiber parts on your rides without using CRES (corrosion-resistant steel) fasteners or similar (good quality stainless fasteners are probably okay on our stuff) run the risk of the metal - especially aluminum -   getting a serious galvanic corrosion problem.
Years ago, some bright spark designed the wings of a naval aircraft with carbon fiber skins and aluminum honeycomb core material without a fiberglass barrier ply between the skins and core and yup, the wings had to be replaced after awhile due to galvanic corrosion.  Obviously, salt water is a great electrolyte and accelerated the problem but IMO, would have happened eventually regardless... 
Interesting stuff that gets posted on DTT - why I keep browsing the site after all these years.
Pat

Offline jetmechmarty

  • Posts: 338
Re: Metallurgy: mixing stainless and aluminum
« Reply #11 on: Jan 28, 2018, 10:51:45 »
Marty,
That chart looks familiar - is it out of a FAA manual?

Pat

I pulled the chart using Google, but yes, aspiring Airframe & Powerplant mechanics are supposed to be familiar with this stuff.

A good example of this is when you remove a bolt from an old motorcycle engine case.  The bolt may be covered in white powder.  There is no rust on the bolt.  This is because the aluminum alloy is anodic to the bolt.  The aluminum is corroding, but not the bolt.
Marty (in Georgia)
XS650