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July 2011

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Subject:
From:
Anil kher <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Anil kher <[log in to unmask]>
Date:
Sat, 23 Jul 2011 14:55:59 +0530
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To test hard gold on plating of 1 to 4  micron is not easy. Procedure is - a
supplier with very reliable process control and proper documentation of bath
maintenance.
Then every 6 months you get a 40 micron gold plated sample and do a test on
micro hardness. Then if the bath is maintained at same levels you get
reliability. The tracking of Co content is ok to maintain control. Nickel in
plating is poor bath working - may be new supplier - whose nickel plating
bath is getting dragged into the gold.

Yr customer shd be worried abt wear resistance than pure hardness. If its
serious business get in touch offline
Anil Kher

Managing Director
Micro Interconnexion Pvt. Ltd.
D3-12A Corlim Ind. Estate, Corlim, ILHAS
Goa, India, 403110
+91-832-2284209/ 337
alt email : [log in to unmask]

LEADERS IN GOLD PLATED PCBs




-----Original Message-----
From: Chris Mahanna [mailto:[log in to unmask]] 
Sent: Thursday, July 21, 2011 9:51 PM
Subject: hard gold verification

Hello netters

We are an independent test facility.  Occasionally we are asked to verify
hard gold as part of bare board qualifications.
Our customers in these cases are usually the OEM supply chain QA.  The buyer
controls the source and Quality's only prayer is to run some first articles
through a 3rd party.
Our customer's chance of determining the hard gold formula used on his
boards is slim to none.  If it weren't for UL, they probably wouldn't even
know who supposedly built them.

Some time ago, we tried Nano-indentation and there is a related TechNet
thread.  It didn't work for us.
I assumed wear studies might be cost prohibitive, so we went to looking for
0.2% cobalt by SEM-EDS.  This has worked nicely, until today.

Today we have 0.09% Co and 0.07% Ni.  From what I read, 0.1 Co is easily
explained by too rapid deposition, and hardness suffers greatly.  The
question is whether the Ni is supposed to be there as a hardener or not?  If
yes, then 0.16% total is probably in the ballpark.  But what are the chances
it just got dragged there?  Does it matter?

Thanks in advance

Chris


Chris Mahanna
Robisan Laboratory Inc.




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