On Sun, 30 Nov 2003 23:54:21 -0800 (PST), mpdickens <
md30022@...>
wrote:
> I've posted this mixture before:
>
> Mix 3.8 grams of Stannous chloride into 1 liter of
> distilled water that is at 80 to 120 degrees
> fahrenheit in temperature. Stir well until dissolved.
> Add 49.5 grams of thiourea to the dissolved stannous
> chloride and distilled water while maintaing the
> temperature between 80 and 120 degrees fahrenheit.
> Stir well until dissolved. Add 12 ml of sulfuric acid
> to this mixture (Be careful! As you add the acid the
> mixture is going to get HOT! Also, Always, ALWAYS add
> acids to water. Never, NEVER add water to acids!).
> Stir well.
>
> You are now the proud owner of electroless tinning
> solution.
>
>
> Best regards
>
> Marvin Dickens
> Alpharetta, Georgia USA
>
>
Well, that sounds easy..
BUT thiourea ia pretty nasty stuff!
It is known to produce cancer (no idea which dose etc.).
and it is very toxic to the environment (DON'T put it down the drain!).
If you really need to use it look at the msds and the safety precautions
and follow to them.
I myself rather use other methods.
st
Why never add water to acid?
I mean i know that but i don't know why.
I thought in the past maybe because any splashes would be more
likely from the water (if you add acid to water) but that can't be the
reason?