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ammonium hydrosulfide
2

ammonium hydrosulfide

ammonium hydrosulfide

(OP)
Dear All,

I am searching for a manufacturer/vendor (in Europe if possible) from where I can order ammonium hydrosulfide for inorganic black dyeing (ECSS-Q-ST-70-03C) of Aluminium, in laboratory conditions (not industrial, just some pieces of Al would be tried out).
Please help!

RE: ammonium hydrosulfide

(OP)
I've found an article from 1997 (Anodizing and Inorganic Black Colouring of Al alloys for Space Applications). It says:". . .Immerse the work in a solution of yellow ammonium sulfide (NH4)2S 20-40g/L for 10 min."
Is this the solution of ammonium hydrosulphide? I found a supplier that sells ammounium sulphide solution (CAS:12135-76-1) 40-08wt%. It is possible to use this chemical? Are these identical?
I am confused. Please help! :)
 

RE: ammonium hydrosulfide

Ammonium hydrosulphide {(NH4)2HS} is also known as ammonium hydrogen sulfide or ammonium bisulfide.  This is NOT the same as ammonium sulfide {(NH4)2S}, although they are similar (think buffered solutions).  You may be able to use either.  I would stick with the ECSS recipe.  You should be able to get the bisulfide chemical from one of these sources:

Chemos GmbH in Germany
Esseco Srl in Italy
FMC Foret, S.A. in Spain

RE: ammonium hydrosulfide

(OP)
Thank you, CoryPad, for the tips! One more question: I've run into the same problem with nickel-acetate. I found only nickel acetate tetrahydrate in most of the catalogues, but not nickel acetate. I guess they are not the same (are they?) and I think I should stick to the ECSS.

Kind regards,

FK

RE: ammonium hydrosulfide

Tetrahydrate means it is a hydrated form of nickel acetate.  That should work for you.

RE: ammonium hydrosulfide

Just remember to take in account the water of hydration when calculating concentrations based on concentration of Nickel in the bath, especially if the recipe calls for the anhydrous form.   

RE: ammonium hydrosulfide

(OP)
Many thanks for the answers!

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