[rafetirmak]

Dear Groups Members

First of all I am not a chemist (electronic board designer)

1) Liquid tin can be synthesis with HCl for small amounts  (SnCl2 and Thyrourea).

2) In some cases SnCl2  solution reacts with air and become SnCl4 in one or two months duration and solution do not work. I put extra Sn after syhthesis to protect the solution. This generally works but is there a better way to over come oxidation?

3) In pratic, commercial liquid tin solutions with bromic acid has long shelf life (2 years). In my limited knowledge bromic acid is a goog buffer to overcome oxidatin. Is it possible to synthesis bromic acid based tin liquid at home as SnCl2 ?

[chenbeier]

1. Yes
2. It only happens, if solution is strong moved  by putting in samples or stirred. Keep it in a closed container and everything is fine.
3. Not with simple work at home. Convert tinchlorides to tin-II-oxide, filter it and neutralize with HBrO₃

[Borek]

Note: "liquid tin" as used here is technically a misnomer, as it refers to a tinning solution, containing tin salts. The only way to really make liquid tin is to melt the metal at 232°C.

[chenbeier]

Yes, correct here is meant an immersion tin salt solution. It is used to coat copper tracks on printed circuit boards with tin without using electrical current.

Mainly Cu + Sn²⁺ => Cu²⁺ + Sn

[chenbeier]

Additionally: Molten tin or tin alloys are used in so called "Hot Air Levelling machines" for the the same purpose. to coat tin on copper circuits.

[Enthalpy]

Antioxidants exist for food. Could some sort of oxygen scavenger be mixed to the tinning solution to prevent oxidation?

If the bottle cap is well closed, the antioxidant needs only to scavenge the oxygen amount topping the liquid every time the bottle is opened.

[rafetirmak]

Many thanaks for all answers especially for detailed answer of chenbeier.
Is there a simple way to convert tin cloride to tin II oxide

[rafetirmak]

Can boric acid and borax buffer be used to prevend this solution ?