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[TowerTalk] stainless u-bolts -- update

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Subject: [TowerTalk] stainless u-bolts -- update
From: (Barry L. Ornitz)
Date: Wed Jun 11 02:35:58 2003
George Skoublis, KF9YR, asked:

>  Is there any galvanic action to worry about when using 
> galvanized u-bolts with an aluminum boom?

The zinc coating on the steel, which makes it galvanized, is 
more compatible with aluminum than any of the various 
stainless steels from an electrolytic standpoint.

There is about a 0.4 to 0.5 volt difference between common 
stainless steels and typical aluminum alloys.  Compare this to 
about 0.1 to 0.15 volt difference between zinc and these same 
aluminum alloys.  From a corrosion standpoint, you want this 
potential difference to be as low as possible.

The only problem is that plated zinc hardware has such a thin 
coating of zinc that the zinc is quickly depleted.  Hot-dipped 
galvanized hardware is to be much preferred.

        73, Dr. Barry L. Ornitz     WA4VZQ

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