C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/122, 204/39
C25D 3/30 (2006.01) C25D 17/00 (2006.01) C25D 21/12 (2006.01) C25D 21/16 (2006.01) C25D 21/18 (2006.01)
Patent
CA 1133418
ABSTRACT OF THE DISCLOSURE A tin-plating bath containing alkali metal hydroxide is circulated through the anode compartment of an electrodialytic cell. The cathode compartment contains an electrolyte and when a current is impressed across the electrodialytic cell, the alkali metal ions in the plating bath migrate through the cation permselective membrane separating the compartments and into the cathode compart- ment. The stannate ions remain in the tin-plating bath in the anode compartment. The removal of the alkali metal ions controls the alkali metal hydroxide content of the plating bath. This electrodialytic treatment of the bath eliminates the conventional chemical treatment to remove the excess alkali metal hydroxide. The electrodialytic cell may be positioned in the tin-plating bath and where feasible utilize the same power source as the plating bath. Alkali metal stannate may also be recovered from the rinse water by passing the rinse water through a center compartment of a three compartment electrodialytic cell bounded by a cation and an anion or neutral perm- selective membrane. Excess alkali metal ions may be removed from either the plating bath or the rinse water of an acid bath by passing the bath or rinse water through the center compartment of a three compartment cell that is bounded on both sides by a cationic permselective membrane. The alkali metal ions are transferred from the center compartment, thus removing the excess alkali metal ions from the bath and rinse water. - 2 -
285045
Macrae & Co.
Pitt Metals And Chemicals Inc.
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