PCB tinning: Difference between revisions
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This is a simple (acid bath) method for tinning your DIY PCBs. | This is a simple (acid bath) method for tinning your DIY PCBs. | ||
Revision as of 16:37, 3 April 2019
This is a simple (acid bath) method for tinning your DIY PCBs.
Materials
- Thiourea (Thioharnstoff) – 12,5 grams
- Tartaric acid (Weinsäure) – 8,8 grams
- Tin(II) chloride (Zinn(II)chlorid) – 1,3 gram
- Tap water – up to 250 ml
You can get the chemicals in a chemist's shop, a good source is Gehrig, Lucerne: http://www.gehrig-ag.ch/content/index.php/werkstoffe/chemikalien
Tools
- Beaker or flask (graduated) to mix the ingredients
- Small weighing scale
- A magnetic stirrer is handy...
- Tray (tupper)
How to
The substances are irritating, use gloves.
- Pour water in the beaker
- Weigh and add the chemicals one by one while stirring
- When everything has dissolved, pour the solution in the tray
Clean the PCB before tinning. Remove any oxide on the copper using a soft abrasive sponge or polishing paste.
Leave the PCB in the solution for a few minutes.
Rinse and dry.
Credits
The idea for this came from Jo Grys (frgmnt) in Berlin. He uses this method and provided a link to Robert Gawron's article: https://robertgawron.blogspot.com/2016/04/galvanic-pcb-tinning-by-using-home-made.html