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June 2005

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Subject:
From:
"Victor G. Hernandez" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 24 Jun 2005 10:22:01 -0500
Content-Type:
text/plain
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text/plain (165 lines)
I too would be interested in reading the article.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: Friday, June 24, 2005 9:02 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel Corrosion Photos On Stevezeva.homestead

Hi George!

Leo Higgens sent me the pictures. They came from a Amkor
paper as he said. I'll send you the paper...

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX

(See attached file: ENIG on BGA study-AMKOR.pdf)


|---------+---------------------------->
|         |           "Wenger, George  |
|         |           M."              |
|         |           <George.Wenger@AN|
|         |           DREW.COM>        |
|         |           Sent by: TechNet |
|         |           <[log in to unmask]>|
|         |                            |
|         |                            |
|         |           06/24/2005 07:59 |
|         |           AM               |
|         |           Please respond to|
|         |           TechNet E-Mail   |
|         |           Forum; Please    |
|         |           respond to       |
|         |           "Wenger, George  |
|         |           M."              |
|         |                            |
|---------+---------------------------->
 
>-----------------------------------------------------------------------
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  |
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  |       To:       [log in to unmask]
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  |       cc:
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  |       Subject:  [TN] Nickel Corrosion Photos On Stevezeva.homestead
|
 
>-----------------------------------------------------------------------
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Steve,

I happened to be looking at the two photos on page 2 of your web site
showing No Nickel Corrosion and Nickel Corrosion. I don't remember who
submitted them but I'm a little confused I thought they were cross
sections
of ENIG plating on a PCB.  However, the gold looks too thick to be ENIG.
There aren't micron marks on these images so I'm not sure my
approximations
are correct but if I assume 1 ounce copper then the electroless nickel
appears to be about 270 microinches thick, which is a reasonable
thickness
for electroless nickel.  However, that would make the gold almost 50
microinches thick and that just doesn't make sense for ENIG.  Also, the
gold seems to be as thick on the nickel that isn't corroded as it is on
the
nickel that is corroded.  I was hoping that whoever sent those images to
you might read this posting and provide more information to clairify
what
these images are.

Regards,
George
George M. Wenger
Reliability / FMA Engineer
Base Station and Subsystems Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908) 546-4531
[log in to unmask]


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