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April 2008

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Subject:
From:
"Igoshev, Vladimir" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Igoshev, Vladimir
Date:
Tue, 15 Apr 2008 11:56:59 -0400
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That is why I asked for the original spactra. Don't you thing it's strange that neither Ni, nor P (if it's ENIG) were mentioned in the original e-mail?



Regards,



Vladimir



----- Original Message -----

From: TechNet <[log in to unmask]>

To: [log in to unmask] <[log in to unmask]>

Sent: Tue Apr 15 11:51:46 2008

Subject: [TN] SV: [TN] Non wetting problem



Probably best on this is Rudy Sedlak or other guy from the chemistry

bransch. I think you may have to do with Nickel-Bromide, which is sometimes

used for the barrier layer.



Inge



-----Ursprungligt meddelande-----

Från: TechNet [mailto:[log in to unmask]] För Richard Kraszewski

Skickat: den 15 april 2008 04:56

Till: [log in to unmask]

Ämne: Re: [TN] Non wetting problem



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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