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Chemical structure of home made solder flux

What is the chemical structure of the flux that I can made at home to use in soldering of pcbs.

Marof K [surname deleted for privacy by Editor]
engineering - Cairo, Egypt
2004

HOOCCH2(OH)C(COOH)CH2COOH.H2O (Common name: citric acid ⇦ on eBay or Amazon [affil link] )

Tom Gallant
- Long Beach, California, USA
2004

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The type of flux you need is dependent on the job it is for. If you need it for a plumbing job, you will need a more aggressive flux than, say, for electronics. I suggest you go to a shop that caters for your type of needs and buy some.

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2004

Lemon juice makes a fair replacement for light soldering jobs. Just squeeze a little juice from a lemon and use a brush or Q-tips ⇦ on eBay or Amazon [affil link] to apply it. The joint should look shiny when finished, if not it may not be a good connection. Try again. I hope this helps.

Chris Lewis
computer help - Sun Valley, California, USA
May 14, 2008

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