anoopai
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Tinning PCB
What is the easiest method to apply tin to home made PCBs ?
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urbs
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IIRC, the solution that I used was Tin Chloride, a bit of sulfuric acid and Thiourea. The Tin Chloride I made since I happened to have some mossy
tin, (don't ask), and ordered the thiourea. You might be able to use one of those liquid silver tarnish removers since they have a bunch of thiourea
included. Make the solution as you need it since it won't store. Do a search for electroless tinning.
http://books.google.com/books?id=m8sJBIMtETgC&pg=PA318&a...
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anoopai
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thanks
thanks urbs , but its stannous or stannic chloride ?
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anoopai
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ok its stanous chloride
http://www.finishing.com/0200-0399/260.shtml
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IrC
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I would look into electrochemical methods. I used to build hundreds of boards and the method you are looking at sucks. You need the copper super
clean, free of oxygen and hydrocarbons. Green scrubby pad (no soap type) in hexane or trichlor to clean works. After you finish it will still suck so
bad most often it actually interferes with soldering. If you plan to do many and/or of high quality learn to electroplate. But still clean well first.
"Science is the belief in the ignorance of the experts" Richard Feynman
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Twospoons
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I found the easiest way is to paint the board with liquid flux (essential !), then use a piece of desoldering braid, full of solder, wrapped around
your soldering iron tip, and basically paint the copper tracks with solder. Results aren't especially pretty, but with care you end up with a flat
'tinned' surface that won't oxidise, and solders very easily.
Helicopter: "helico" -> spiral, "pter" -> with wings
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Arthur Dent
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This is the stuff I use:
http://www.lpkfusa.com/boardfinish/tinplating.htm
It's a mixture of fluoroboric acid, Stannous fluoroborate and thiourea. It works incredibly well. You drop any cleaned-copper PCB in this solution and
in minutes, you have a perfect, uniform coating of tin on your traces.
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
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Texium
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Thread Moved
19-11-2023 at 16:21 |
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