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Subject:
From:
"Barmuta, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Barmuta, Mike
Date:
Wed, 22 Mar 2006 09:48:47 -0800
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Hi All: Maybe I'm missing something in this whole Cr6 laminate thread
but I see it as a non-issue.

Most of these chromate coatings are extremely thin 200-300 angstroms
i.e. a millionth of an inch.                    	
Hot alkaline chemistry, strong acidic chemistries or mechanical surface
prep strip the chromate conversion coating from the surface of the
copper foil. So whether you are processing innnerlayers in a cleaning or
oxide process or outerlayers in a cleaning or metallization process the
presence of alkaline cleaners, surface treatments and/or acidic micro
etches will remove the thin deposit of chromate coating from the foil.
Thus making it RoHS compliant.

                                                        	
	
Regards
	
Michael Barmuta
	
Staff Engineer
	
Fluke Corp.
	
Everett WA
	
425-446-6076
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, March 22, 2006 9:06 AM
To: [log in to unmask]
Subject: Re: [TN] chromates on copper surface (Cr6)?

High presence of Cr3/Cr6 will cause issues with oxide treatment when
using reduction/replacement chemistries.  The chem clean process prior
to resist lamination is designed to reduce the Cr3 to levels not
affecting etch, strip and bonding treatment.  Detecting levels related
to this would seem to be evident in other areas in the process.  

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha
Sent: Wednesday, March 22, 2006 10:45 AM
To: [log in to unmask]
Subject: Re: [TN] chromates on copper surface (Cr6)?

A few responses are saying this same thing, that it won't
be present after fabrication. I'll have to test it for
myself because I have a customer that detected Cr. But the
customer doesn't know which state of Cr. Do we just assume
it is Cr3 and not Cr6?

Thank you,
Eddie Rocha



If the Cu on the laminate is Cr+6 passivated on receipt, it
won't be by
the time you've prepared it for lamination as surely the
pretreatment
will remove the passivation layer?

Regards
Ian Fox
Goodrich ECS

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David
D. Hillman
Sent: 22 March 2006 00:03
To: [log in to unmask]
Subject: Re: [TN] chromates on copper surface (Cr6)?

Hi Eddie! Just to add to Rudy's comments - any chromate
conversion
coating that is Cr+6 based does convert to Cr+3 when
damaged (e.g. the
self healing
aspect) but there is always some of the Cr+6 species
around. Any
chromate conversion coating that is Cr+6 based is not RoHS
compliant.
Your supplier is incorrect unless he/she is supplying a
Cr+3 or zero
chromate conversion coating as Rudy described. Qualifying a
substitute
conversion coating that is "as good as or better than" a
Cr+6 conversion
coating is not an easy task depending on your use
environment
conditions. Good Luck.

Dave



             Eddie Rocha
             <[log in to unmask]
             M>
To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>
cc


Subject
             03/21/2006 05:56          Re: [TN] chromates
on copper
             PM                        surface (Cr6)?


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
                Eddie Rocha
             <[log in to unmask]
                    M>






Was this a tough question? I didn't receive but one
response. Thanks
Rudy.




Eddie:

Not clear I can "explain" something which is likely
incorrect.
If your vendors start with Cr +6, the likelihood of there
being zero
Cr+6 on the foil is near zero... certainly some of the Cr
+6 reacts with
Copper metal Cu0 to form Cr+3 and
Cu+2, but all of it?  Hah... dream on.

However, before you go off and begin screaming, I suspect
strongly that
some producers of foil may well be switching from Cr+6 to
zero Cr
coating...  I cannot fathom why organics could not do as
good a job...

And if there are foil producers who need some technology to
assist this
change, contact me... :-)

Rudy Sedlak
RD Chemical Company

Eddie Rocha <[log in to unmask]> wrote: I understand that
copper foils
are protected with chromates
(Cr6) prior to producing laminate. Since this is an RoHS
banned
substance I need to understand why all my laminate
suppliers have
certified their material to be RoHS compliant.

One supplier responded by stating that Cr6 is reduced to a
state of Cr3
or Cr0 which is not a restricted substance.

Can somebody explain how it goes from a state of Cr6 to one
of the
reduced states and why sometimes Cr3 versus Cr0?


Thank you,
Eddie Rocha

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