Sometimes this gets confused with yellow-chromate and is usually
anodized onto the metal. Its great for incoming inspection because they
can see it clearly, but not so great for conductivity. The bright zinc
seems to satisfy everybody, they can inspect it and we seem to be
getting good conductivity from it.
Gary McInturff
-----Original Message-----
From: Allan, James [SMTP:[email protected]]
Sent: Thursday, October 15, 1998 5:20 AM
To: '[email protected]'
Subject: RE: Yellow Zinc
I will second what Chris says. The yellow zinc has a surface
resistance
that must be penetrated in order to have conduction across
joints.
Jim Allan Racal-Datacom
-----Original Message-----
From: James, Chris [SMTP:[email protected]]
Sent: Thursday, October 15, 1998 5:49 AM
To: 'Knighten, Jim'; 'emc-pstc list server'
Subject: RE: Yellow Zinc
Don't have the figures to hand but having checked it out
a while
ago we
have moved from the gold/yellow zinc passivation on
steel parts
to the
silver/clear finish:
UK spec: BRIGHT ZINC PLATE TO BS 1706 Fe/Zn 8 c 1A
US spec: BRIGHT ZINC, ASTM B633, TYPE III, Fe/Zn 8
This has a much lower resistance. We found the "gold"
unacceptable for
emc considerations.
Chris James
Engineering Services Manager
Dolby Labs Inc.
-----Original Message-----
From: Knighten, Jim
[mailto:[email protected]]
Sent: Thursday, October 15, 1998 1:20 AM
To: 'emc-pstc list server'
Subject: Yellow Zinc
Hi Guys,
Does anyone know what a typical conductivity or
resistivity is
for
yellow zinc coating???
Jim
Dr. Jim Knighten e-mail:
[email protected]
Senior Consulting Engineer
NCR
17095 Via del Campo
San Diego, CA 92127 http://www.ncr.com
Tel: 619-485-2537
Fax: 619-485-3788
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