Poh Kong Hui asked:

>Can anybody advise me what is the rate of Aluminium dissolve into the solder
>(63/37) bath.

See Manko, Solders and Soldering, 3rd edition (ISBN 0-07-039970-0) p.92

Slow at typical wave solder temps, but still enough to be a problem. Your
flux may attack it, too.

>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 ?

You can't simply spray on a Teflon coating. You would be better off having
the aluminum hard anodized, this is common and economical, it will reduce
the dissolution pretty well.


regards,

Jerry Cupples
Interphase Corporation
Dallas, TX USA
www.iphase.com