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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