Check out page 92 in Manko's Soldering book - it is stated that at 
     soldering temperatures the solubility of Al is less than 0.5%. W.G. 
     Bader also did quite a bit of work on the dissolution of elements in 
     solder but I don't know if he looked at Al - you will have to conduct 
     a literature search using Bader as the key word. You also might try 
     putting a secondary finish on the Al - anodized or nickel plate, etc. 
     to prevent wetting. Good luck.
     
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Re: Rate of Aluminium in Solder Bath.
Author:  [log in to unmask] at ccmgw1
Date:    6/7/96 10:24 AM


Dear Technet,
     
Can anybody advise me what is the rate of Aluminium dissolve into the solder 
(63/37) bath.
     
I'm using Alu Stiffener to prevent the PCB from warping. How can use PTFE to 
coat it.
     
Is there any spray type and where can I can it ?
     
     
Poh Kong Hui
Nera Electronics
Email:  [log in to unmask]