配方类型:

METALS AND TREATMENTS

配方说明:

Tin Plating

配方组成:

Limiting* value at 70'F/250 amp/sq ft
Limiting* value at 100'F/425 amp/sq ft
The fluoboric acid is added to 30 gal of water and then the stannous
fluoborate is added. The gelatin is added to 2.7 gal of warm water in a
suitable vessel such as a pail and allowed to swell overnight. The
powdered beta naphthol is added and the mixture stirred continuously
while bringing the mixture to a boil. should the beta naphtol be in
flake form, it should be dissolved in the minimum amount of methanol
before adding to the gelatin-water solution. A creamy mixture will
result which should be added with continuous stirring to the bath. The
catechol may be added directly to the bath.
Operating Condition
Fluoboric Acid (48%)/350.0 lb
Current* density for practical operation/25-125 amp/sq ft
Average tank voltage/1-3 volts
*Limiting value is the maximum current density which will give
satisfactory deposits 0.001 in. in thickness.
Beta Naphthol/0.4

配制方法:

Anodes Pure cast tin is used. They may be bagged with Vinylon, Dynel, or similar materials.
Anode to cathode ratio-from 1:1 to 2:1