Hi Terry - yes, plasma works well at stripping oxides but it also can go 
after a number of other materials too if the process is not tuned 
correctly. ROSA electrochemically converts only the oxide and leaves the 
rest of the assembly/component alone.  Too bad Mother Nature does not like 
a non-oxidized metallic surface!

Dave



"Terry L. Munson" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/11/2009 04:11 PM
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Re: [TN] BOARD SOLDERABILITY






Dave
I would agree that ROSA would be effective for only a couple hours.   We 
have been very effective at removing oxides with plasma and even to the 
point 
of stripping paralyene coating that is 4-5 mil. 
 
 
In a message dated 12/11/2009 8:11:19 A.M. Eastern Standard Time, 
[log in to unmask] writes:

Hi Guy!  Yes the ROSA (Reduced Oxide Soldering Activation) process would 
be 
able to  restore a HASL surface finish but I probably have the only 
remaining  functioning system in the industry. Secondly, you need to 
process the  "restored" pwb within a few hours after ROSA treatment or the 
 
effectiveness is lost . I could restore Lee's pwb solderability but I 
couldn't get it shipped to him in time before it would it would 
re-oxidized. As several other TechNet contributors have suggested, a very 
controlled re-HASL process with the correct flux and cleaning processes 
could be a potential option.

Dave



Guy Ramsey  <[log in to unmask]> 
Sent by: TechNet  <[log in to unmask]>
12/10/2009 06:55 PM
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Re:  [TN] BOARD SOLDERABILITY






Remember that tank we had  at ACI that was did electrochemical reduction. 
It was a Rockwell invention  I think, ROSA? It could restore solderability 

to some metals. I don't know  how it would get through the HASL. 

-----Original Message-----
From:  TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Thursday,  December 10, 2009 1:54 PM
To: [log in to unmask]
Subject: [TN] BOARD  SOLDERABILITY

One of my colleagues has a HASL finished board, that sat  in our stockroom 

for ~ 10 years, and of course he want to use them (EOY  Billing).

Ran the board through wave soldering, and it did not solder  at all. Good 
news was that the board was not damaged by the heat - it just  was not 
solderable. I do not want to use a more active flux since it will  be 
difficult to clean.

Are there any solutions / processes that can  restore board solderability?

Thanks in advance.

Lee Whiteman,  PMP
Senior Member Engineering Staff
L-3 Communications  East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail:  [log in to unmask]

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