Electroplating of zinc on steel can leave hydrogen embrittlement. That is why many nuts and bolts are "mechanically plated". This is, impact plated with zinc in something like a cement mixer that has glass beads, zinc powder, and a touch of a liquid acid. It is also called "peen plating" as the zinc is "peened" or hammered onto the surface.
-----Original Message-----
From: Gary Bremer <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 29 Apr 2009 6:27 pm
Subject: Re: [TN] Plating on screws
AIDS.FRMI have had problems with screws that purchasing acquired
hat had a zinc platting that caused Hydrogen embrittlement but there was no
inc whiskers just a lot of broken screws.
Gary Bremer
> Date: Wed, 29 Apr 2009 13:45:06 -0700
From: [log in to unmask]
Subject: Re: [TN] Plating on screws
To: [log in to unmask]
What is the logic? Is the layer thin enough that stress is not induced
or a by-product? Does it poison the alloy as does the addition of lead
to tin? The expected results didn't pan out? Was it do to a twist of
fate?
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Wednesday, April 29, 2009 1:34 PM
To: [log in to unmask]
Subject: Re: [TN] Plating on screws
On the "Wednesday Whiskers Call" this morning.? NASA reported that the
documents they have seen indicate that galvanized zinc is supposedly
immune to zinc whiskers.?
Denny
-----Original Message-----
From: EIMCNews <
[log in to unmask]>
To: [log in to unmask]
Sent: Sun, 26 Apr 2009 4:28 pm
Subject: Re: [TN] Plating on screws
Denny, Steve, Dave, et al
Thanks for all the feedback. I knew, of course, about tin and had heard
some things about cadmium years ago but dismissed them because cadmium
use
was declining for much of everything but government spec'd corrosion
requirements. Curious if the zinc whisker propensity is more or less
for
electroplated vs. galvanized zinc. Anyone know?
Roger
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