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April 2008

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Tue, 15 Apr 2008 13:20:40 -0500
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Good point, Vladimir.
Possibly Gilbert's boards are displaying nickel skips due to bromide contamination just prior to plating. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Tuesday, April 15, 2008 10:57 AM
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] Non wetting problem

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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