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Electrochemistry Tin striping ?
- Thread starter soltysek0383
- Start date
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necromancer
Well-known member
were you looking for this information?
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=45&t=20700&p=212522&hilit=tin#p212522
if not please give more information on and about your process (like what + and - are made of)
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=45&t=20700&p=212522&hilit=tin#p212522
if not please give more information on and about your process (like what + and - are made of)
Yes. Stannate works. Well known for people de-tinning brass/copper/steel and the like.
soltysek0383
Member
Ok I made 12h run of it on cathode (-) (made of copper) I have black powder .On anode nothing (+) (made of rust free steel) . Solution 30% NaOH after 1h turn deep blue/violet after 12h milky white . But PCB still have tin on it what I made wrong to weak solution , to small Volts or mayby Amperes ? On PCB all tin turn black you can see that it dissolve partially but still parts hold to PCB .
Do you have the lead/ tin solder (of the circuit) made as the anode connection?
Or is it just sitting in solution as in your drawing above?
Or is it just sitting in solution as in your drawing above?
soltysek0383
Member
It's tin/silver/ mayby bismuth solder ( RoSH ) , no just siting on PCB like on drowning , I made one more test on copper spring I sit some steel socked covers with solder on it an sock in NaOH 45% warm with electrolysis it 14A/5V , solution turn red after one minutes and follow color changing blue after 5 minutes to violet deep blue after 3H , whot happened is that copper spring was dissolved and seet on cathode as deep black sand/crystals tin is un tuch . I hope picture explain something whot I made sory for quality it's ipad drownings . I thing I know whot I made wrong cathode probably need to be made of tin ?
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solar_plasma
Well-known member
Did you measure 14 A or is that the maximum of your supply? To answer one of your questions, you would normally want to use inert electrodes on the metal gaining side, for example stainless steel or graphite.
Your setup is full of contaminants. You could save you a lot of time first to read every post about electrolysis and tin, Ammen's book about refining (some nice chapters about electrorefining) and find some patents about that on the net.
Your start material should be as clean and pure as possible, - take some tin only and make it work before you try on unknown alloys and blended stuff that make this whole thing almost unpredictable.
Your setup is full of contaminants. You could save you a lot of time first to read every post about electrolysis and tin, Ammen's book about refining (some nice chapters about electrorefining) and find some patents about that on the net.
Your start material should be as clean and pure as possible, - take some tin only and make it work before you try on unknown alloys and blended stuff that make this whole thing almost unpredictable.
Good electrical contact with the anode (positive of your power supply of the metal needed to be oxidized).
This would be hard to achieve with circuit boards, many of the circuits on the board do not connect, besides maybe the ground plane, also as the thin metal traces are oxidized the would break the connection to the rest of the circuit traces of the boards.
Maybe a copper screen might help as an anode tray , maybe a vibrating table to help keep better contact with the screen
Several metals most likely would be oxidized, not just the tin.
Depending on your goal you could use several different metals as the cathode; it would not be important for what you are trying to do here.
I would probably stay away from iron as it oxidizes so easily, I am not totally sure how all it would react in this caustic solution.
I know this is most likely an experiment, but I do not think it will work that well, just my guess, as I just think there would be a whole slew of problems which would not be easy to overcome, especially if you do not understand the electrolytic process in general, or how these metals would react in the hydroxide electrolyte.
Also this solution will need to be treated for waste when you are done experimenting with it, as any other toxic solution when recovering or refining metals, you could have a slew of hydroxide metals in that soup many of which can be pretty toxic mix.
This would be hard to achieve with circuit boards, many of the circuits on the board do not connect, besides maybe the ground plane, also as the thin metal traces are oxidized the would break the connection to the rest of the circuit traces of the boards.
Maybe a copper screen might help as an anode tray , maybe a vibrating table to help keep better contact with the screen
Several metals most likely would be oxidized, not just the tin.
Depending on your goal you could use several different metals as the cathode; it would not be important for what you are trying to do here.
I would probably stay away from iron as it oxidizes so easily, I am not totally sure how all it would react in this caustic solution.
I know this is most likely an experiment, but I do not think it will work that well, just my guess, as I just think there would be a whole slew of problems which would not be easy to overcome, especially if you do not understand the electrolytic process in general, or how these metals would react in the hydroxide electrolyte.
Also this solution will need to be treated for waste when you are done experimenting with it, as any other toxic solution when recovering or refining metals, you could have a slew of hydroxide metals in that soup many of which can be pretty toxic mix.
