Romix - 29-6-2016 at 07:56
Would tin coating on steel dissolve in NaOH solution? What about molten?
It should, it changes colour after boiling in, from shiny silvery to grey.
I'll test few ml of it soon, see if there's any Sn there.
Tin under paint or other organic coatings stays unetched, must be burned off before boiling.
Same happens when part gets electrolyzed through NaOH with Sn ions in.
Tin coated part used as anode, turns grey, all silvery tin coating, goes in solution.
On internet, people say that this way you can produce pure tin on cathode. Lies!
Instead you get very poisonous gas, don't know what it is, some one told me that it's SnH4.
[Edited on 29-6-2016 by Romix]
Romix - 29-6-2016 at 08:01
Zinc coating dissolves in it nicely at any temperature.
And recovers with aluminum, only in complex, it won't reduce Zn in +2chloride or other salt.
Things like CRT frames, and other galvanized scrap can be processed that way.
Most of aluminium then dropps out on dilution of solution.
And base can be used again and again until it becomes neutral, from CO2 sucked from air.
Any uses for aluminium oxide that dropped?
[Edited on 29-6-2016 by Romix]
Romix - 29-6-2016 at 08:13
Once I made aluminium compund, white sticky paste, solidifies when dried. Nicely takes shape, good to fix dents in walls, or acid burns on concrete
before painting it over.
I can't remember how I made it, any ideas what it can be?
When boilled it were yellow, on addition of ammonia, precipitates as light green jell, that decomposes to brown substance, at higher temperatures, at
about 200C turns into green rocks.
I were washing filters, after use, and collected liquids were left with aluminum for half year.
Very very diluted solutions, of copper, tin chlorides. Recovered with Al.
[Edited on 29-6-2016 by Romix]
[Edited on 29-6-2016 by Romix]