TECHNET Archives

March 1998

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Goldman, Patricia J." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 12 Mar 1998 13:24:00 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (105 lines)
I believe there are two test methods for porosity in IPC TM-650, the
test methods manual.  The electrographic test is much more sensible than
the nitric acid.  I have used dimethylglyoxime as the indicating
solution.  Nickel shows up as red dots and copper as green dots (coming
thru the pores), and the indicating paper (with the dots on it) is
basically a map of the pores.  Also, unlike nitric, if you can clamp to
the fingers without cutting the part, the electrographic test can be
non-destructive.

Patty
 ----------
From: David D Hillman
To: [log in to unmask]
Subject: Re: [TN] Contact resistance
Date: Thursday, March 12, 1998 8:47AM

Hi Gaby - you could use SERA to determine the extend of the gold plating
porosity but it won't tell you anything direct about contamination. Give
Mike Pavlov or Peter Bratin an email at [log in to unmask] for more help. I
have had some success and some failures using the SERA tester for noble
metal porosity. You could also use the fuming nitric acid test to
determine
your level of plating porosity (hey TechNet - anyone know the ASTM
method
number for the test?) but the test is somewhat subjective. You might
also
conduct a Scanning Electron microscopy analysis to see what the level of
porosity is plus grab some compositional info - you might be able to
find
some contamination this way. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




[log in to unmask] on 03/11/98 05:06:37 PM

Please respond to [log in to unmask]; Please respond to
      [log in to unmask]

To:   [log in to unmask]
cc:    (bcc: David D Hillman/CedarRapids/Collins/Rockwell)
Subject:  [TN] Contact resistance




Dear Technetters!
We experience high contact resistance on keyboards.
The plating is 0.15u Au on 6u Ni.
1.Could I use SERA in order to see if there is a contamination on the
keypads
in comparison to the bare boards?
2.If YES, HOW?
3.How could I compare the porosity of the gold plating of two different
batches ?
Thank you in advance
Gaby
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV
1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with
following
text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for
additional
information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or
847-509-9700 ext.311
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV
1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for
additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or
847-509-9700 ext.311
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################


ATOM RSS1 RSS2