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Subject:
Re: Plating on screws
From:
Gary Bremer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gary Bremer <[log in to unmask]>
Date:
Wed, 29 Apr 2009 15:27:14 -0700
Content-Type:
text/plain
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text/plain (110 lines) 
AIDS.FRMI have had problems with screws that purchasing acquired
that had a zinc platting that caused Hydrogen embrittlement but there was no
zinc 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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