Rohco, Inc.

R. O. Hull & Company, Inc.

Craig V Bishop

William E Eckles

Thomas J Foley

Peter T Vaitekunas

James M Frank

The invention provides an on-stream method and apparatus for analyzing of the concentrations of chemical components in a bath, especially in an electroplating bath, contained in one or more processing tanks. Moreover, the information obtained by such analysis of a single bath or of multiple baths may be efficiently employed to control such concentrations in the bath or respective baths, for example, by controlling the addition of one or more additives. The apparatus comprises a multi-steam sampling value and a computer for controlling the operation of said value. The computer also controls means for adding material to the baths in order to maintain the parameters thereof.

Automatic analyzer and control system for electroplating baths

A composition is described which provides an improvement in the electrodeposition of zinc from aqueous alkaline plating baths containing cyanide ions. The new composition comprises the reaction product obtained by the process of reacting

Alkaline zinc electroplating bath and additive compositions therefor

Aqueous acidic coating solutions are described for treating zinc or zinc alloy surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion, an acid other than nitric acid, and an oxidizing agent. The coating solutions containing trivalent chromium as substantially the only chromium ion present preferably are prepared by reducing an aqueous solution of hexavalent chromium with sufficient reducing agent to reduce all of the hexavalent chromium to trivalent chromium. Chromate coatings on zinc and zinc alloy surfaces are produced by contacting said surfaces with an aqueous acidic solution of the invention.

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Cleveland, OH, United States of America

Craig V Bishop