To cmaffe:							
									
		In the past we carbon treated our acid copper plating baths 
on a time basis as you are curently doing.About 10 years ago we switched from 
a time accumulation basis to an amperage basis.We are currently carbon 
treating when 600 Amp Hours/Gal.is reached.				
		The following factors were used to arrive at this number:	
		1.Plating distribution, surface:hole			
		2.Surface plating distribution,top of the top racked 	
		panel:bottom of the bottom racked panel			
		3.Cross sections;  grain structure and corner cracking	
		4.Ductility                                                  
    		5.Hull cell						
									
		These are Lea Ronal PCM+ baths with automatic brightner 
dosig.All plating is pattern plate with Dynachem LP resist.The carbon treat 
cycle uses an oxidizer followed by the carbon all done off line in a batch 
process.This should provide you with a starting point.Obviously many factors 
can influence your requirement;resist,chemisties-preclean/acid 
copper,rinsing,carbon treat procedure,end user specifications etc.etc.	
									
					Regards				
					Michael Barmuta			
					Staff Engineer			
					Fluke Corp.			
					Everett Wa.			
					(206)356-6076			
								 	
		
On Mon, 29 Jul 1996 07:06:29 -0700 [log in to unmask] wrote:

> From: [log in to unmask]> Date: Mon, 29 Jul 1996 07:06:29 -0700
> Subject: Carbon Treatment
> To: [log in to unmask]
> Cc: [log in to unmask], [log in to unmask], [log in to unmask]
> 
>      With higher tech product these days and the associated high aspect 
>      ratio copper plating chemistries, we're looking for a good method to 
>      determine when to carbon treat as a preventative measure.  For years 
>      I've used a guideline of carbon treating copper baths every 6 mos. or, 
>      if through put per gal was very high, perhaps quarterly.
>      
>      T&E results are so susceptible to sample prep, and I've never really 
>      found them to correlate to anything but perhaps extreme organic 
>      contamination.  I've never felt comfortable relying on those to 
>      indicate when to treat. 
>      
>      Multiple thermal shock is another method I'm hearing is an indicator. 
 
>      We currently pass six or more, yet just went through a bath decant to 
>      minimize detrimental organic build up while awaiting installation of a 
>      new carbon treatment system.  The baths are only about 6 mos. old but 
>      with only about 3 months of production throughput.
>      
>      Appreciate any ideas or schemes that work for others, especially high 
>      volume, high tech.
> 
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