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April 2008

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Subject:
From:
Richard Kraszewski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Richard Kraszewski <[log in to unmask]>
Date:
Mon, 14 Apr 2008 22:56:11 -0400
Content-Type:
text/plain
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text/plain (88 lines)
Some quick thoughts before I call it a day?

Br- Possible something from the FR4fire retardant? Dust from routing?

Non-wetting?  Well you can plate onto about anything (ie., bronze baby
shoes).  Perhaps the gold is thin and dissolves quickly exposing an
unsolderable (highly oxidized) surface beneath?

Rich K / KEJ


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gilbert Min
Sent: Monday, April 14, 2008 9:48 PM
To: [log in to unmask]
Subject: [TN] Non wetting problem

Dear All.

Hope you had a nice weekend. 

I got a call from my customer that my PCB has non wetting problem, and
I
received 2 defect samples 

I saw the contaminated gold plated surface @ 1st sample, no abnormal
surface
and defects were found @ other sample.

I understand the contaminated gold surface was able to make non wetting
problem, but Another sample, I couldn't find anything on surface. 

We did FE-SEM / EDX analysis. 

Results: 1st sample: Br, Au, C, O, Au

2nd sample C, O, Au Ion were detected 

. 

I wonder why Br was detected?, do you have any idea for defection of Br
on
Gold plated surface?.

For 2nd sample, I have no idea, I could not understand the mechanism for
non
wetting problem without any abnormal gold plated surface.

If have idea & possible, would you share your great wisdom to me?

 

Best Regards / Gilbert Min

 

Tel.: 82- (0) 11-9242-5340

 


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