Thanks Dave,

 

The origin of the ugly aspect is now known. What I need to find out is if this is cosmetic and functionally benign or could affect the function of high Amp carrying fuses.

 

Anyone could advise on that?

 

Thanks again,

 

Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] <mailto:[log in to unmask]>  
W | www.digico.cc <http://www.digico.cc/> 

 
 N'imprimer que si nécessaire - Print only if you must

 

De : [log in to unmask] [mailto:[log in to unmask]] 
Envoyé : April-01-10 5:51 PM
À : TechNet E-Mail Forum; Ioan Tempea
Cc : [log in to unmask]
Objet : Re: [TN] Grainy after wave

 


Hi Ioan - take a look at the email archive describe by Steve G. - if the surface finish is bright acid tin then you may have an excess codeposited plating condition as was described during the Technet conversation on Joe Kane's question. 

Dave Hillman 
Rockwell Collins 
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Ioan Tempea <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]> 

04/01/2010 01:37 PM 

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[TN] Grainy after wave

 

		




Dear Technos,



Please see photo at http://ipc-technet.groupsite.com/gallery/12732



The component is a high current fuse holder, see the vertical mini -powerclaw, Sn over Ni finish http://www.andersonpower.com/products/pcb-powerclaw.html



We wave it with SN100C, 525F solder temperature, water soluble flux. As you notice, the finish on the left contact turns grainy, compared to the one next to it, that keeps the same look as before wave. The copper plane connections of the 2 contacts are different, hence a temperature differential between the 2.



My questions are:

How this happens? Sn starting reacting with the underlying Ni?

Should I worry about this? After all it is only a superficial issue. Can it alter the functionality of the contacts (they are supposed to see a lot of Amps)?



Thanks,



Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] <mailto:[log in to unmask]>  
W | www.digico.cc <http://www.digico.cc/> 


N'imprimer que si nécessaire - Print only if you must




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