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October 2009

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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
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Date:
Wed, 21 Oct 2009 02:44:16 +0000
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Werner,



You just confirmed what I said in my previous e-mail. You customer got failure with black appeared pads, but it wasn't BP failure. Similar appearance doesn't mean the same mechanism.



Regards,



Vladimir

SENTEC

11 Canadian Road, Unit 7.

Scarborough, ON M1R 5G1

Tel: (416) 899-1882

Fax: (905) 882-8812

www.sentec.ca





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

From: Werner Engelmaier <[log in to unmask]>

Date: Tue, 20 Oct 2009 22:16:40 

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

Subject: Re: [TN] ENIG Issue





 Hi Vladimir,

I have one client who experienced 'Black Pad' after 9(!) soldering operations. The P-content got progressively worse; it peaked with the EDS spikes for P being as high as those for Sn.

Werner





 





 



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

From: [log in to unmask]

To: TechNet E-Mail Forum <[log in to unmask]>; Werner Engelmaier <[log in to unmask]>

Sent: Tue, Oct 20, 2009 10:07 pm

Subject: Re: [TN] ENIG Issue





















Werner,



With all due respect, I don't think you are right.



Regards,



Vladimir

SENTEC

11 Canadian Road, Unit 7.

Scarborough, ON M1R 5G1

Tel: (416) 899-1882

Fax: (905) 882-8812

www.sentec.ca





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

From: Werner Engelmaier <[log in to unmask]>

Date:         Tue, 20 Oct 2009 22:01:35 

To: <[log in to unmask]>

Subject: Re: [TN] ENIG Issue



 Hi George,

\While what you say in the first paragraph is correct, the second paragraph is 

not.

'Black Pad' is not an all-or-nothing proposition. The seeds are sown at the 

Ni-plating (not the Au-plating) with the P-codeposition. However, multiple or 

lengthy expositions to high soldering temperatures result in more Ni being 

dissolved to form IMCs leaving ever more P behind. This can create 'Black Pad' 

where none existed before.

Werner





 





 



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

From: George Milad <[log in to unmask]>

To: [log in to unmask]

Sent: Tue, Oct 20, 2009 9:52 pm

Subject: Re: [TN] ENIG Issue





















As always as soon as there is a solderability issue with ENIG, "Black pad"  

comes up. This is a problem because it does not allow for further 

investigation.  Everyone accepts since this is ENIG then it must be black pad.

 

If this was a black pad issue the back side should have exhibited the same  

problem. BP occurs during the plating of the gold on top of the Ni. BP 

cannot  differentiate one side from the other.

 

Do not accept BP as the answer and keep investigating.

 

 

Regards

George Milad

George Milad

National Accounts  Manager for Technology

Uyemura International Corp (UIC)

249 Town Line Rd  

Southington CT 06489

[log in to unmask]

Cell: (516) 901  3874



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