182 ELECTROLYSIS. 



CHAPTEK XII. 



DEPOSITION OF VARIOUS METALS. 



Deposition of Copper, Zinc, and Tin Alloys Deposition of Platinum De- 

 position of Lead Deposition of Zinc Deposition of Iron Deposition of 

 Tin Tin Crystals Deposition of Antimony Deposition of Aluminium 

 Deposition of Cadmium Deposition of Cobalt. 



DEPOSITION OF COPPER, ZINC, AND TIN ALLOYS. 



SALZEDE'S PROCESS. The baths used by M. Salzede are com- 

 posed as follows : 



1. Brass Bath. 



Potass'c cyanide 12 parts. 



Potassic carbonate 600 



Zinc sulphate 48 



Cupric chloride 25 



Ammonic nitrate 305 



Water 5000 



Dissolve the cyanide in 120 parts of water ; dissolve the 

 potassic carbonate, the zinc sulphate and the cupric chloride in 

 the remainder of the water, raising the temperature to about 

 60 C. When the solution is made, add the ammonic nitrate, 

 stirring the mixture. Let the liquor set for a few days, and 

 use it after decanting, when no more sediments are formed. 



2. Bronze Bath. 



Potassic cyanide 50 parts. 



Potassic carbonate 500 



Tin chloride 12 



Cupric chloride 15 



Water 5000 



This bath is used at a temperature not exceeding 36 C. 



