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 |
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