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You need a barrier plate between the brass and the tin.  Zinc from the brass diffuses into the tin causing solder-ability problems.

 

You should use a flash of copper or nickel-plating between the brass and tin to stop this happening.  Nickel has a longer shelf life but copper is easier to control so I would suggest you use copper.

 

Neil

 

 

-----Original Message-----
From: Dan R. Johnson [mailto:[log in to unmask]]
Sent: 26 September 2002 01:04
Subject: Re: stripping brass

 

Thanks to all for your suggestions, off to find;

    Solder Nu

    fluoboric acid

    A new process.........

 

 

Which leads to a new question, what is a good process for tinning small quantities of mechanically etched prototype PCB's and chem. etched brass parts?

Keep in mind we are a electronics manufacturing/r&d house with limited chemical processing resources.

Thanks,

Dan

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