Process of preparing a potassium stannate-stannic oxide sol tin electroplating solution - Patent # T102501

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Process of preparing a potassium stannate-stannic oxide sol tin electroplating solution

T102501	Process of preparing a potassium stannate-stannic oxide sol tin electroplating solution

Patent Drawings:
Inventor:	Croft
Date Issued:	December 7, 1982
Application:	06/322,378
Filed:	November 17, 1981
Inventors:	Croft; Richard (Lakewood, OH)
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class:	205/101; 205/300
Field Of Search:
International Class:	C25B 1/00
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Abstract:	A process for the production of a stannic oxide sol-potassium stannate tin plating solution is disclosed comprising the steps of:anodically dissolving stannous tin in a potassium electrolyte such as potassium hydroxide to form potassium stannite in a first electrolytic cell including an anode compartment and a cathode compartment;simultaneously preventing the potassium stannite from migrating from the anode compartment to the cathode compartment by interposing therebetween a permselective ion exchange membrane (e.g., an anionic permselective membrane);oxidizing said potassium stannite to form a potassium stannate-containing solution by suitable means such as by contacting an oxygen-containing gas with the potassium stannite in a scrubbing tower;electrodialytically transferring potassium cations of said potassium stannate-containing solution from an anode compartment of a second electrolytic cell to a cathode compartment of said second electrolytic cell while simultaneously preventing migration of tin anions from said anode compartment to the cathode compartment by maintaining a cation permselective dialytic membrane between the anode and the cathode; andrecovering a stannic oxide sol-potassium stannate solution from the anode compartment of said second electrolytic cell.
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Description: