Taskem, Inc.

Coventya Gmbh

Coventya Sas

Robert E Frischauf

William E Eckles

George S Bokisa

Lionel Thiery

Jean-Jacques Duprat

Frederic Raulin

Becki A Zinni-Kettering

An apparatus () for applying a zinc or zinc-alloy electroplate to a workpiece comprises an electroplating bath () having a pH more than about 14. The electroplating bath includes zinc ions and an additive. A cathode workpiece () is in the bath. An anode assembly () contacts the bath. The anode assembly includes an anolyte and an insoluble metal anode in the anolyte. The additive is capable of electrolytically breaking down upon contact with the anode. The anode assembly inhibits the electrolytic breakdown of the additive.

Zinc and zinc-alloy electroplating

Disclosed are systems and methods of plating a tin alloy in an efficient, economical, and environmentally friendly manner. An electrochemical cell containing an anolyte compartment and a catholyte compartment separated by a selective membrane is employed. The selective membrane prevents ionic metals from migrating from the catholyte compartment to the anolyte compartment. A conduit may be employed in the electrochemical cell to permit one way flow of anolyte to the catholyte compartment thereby replenishing tin to the catholyte compartment.

Tin alloy electroplating system

The present invention relates to an apparatus ( ) for applying a zinc-nickel electroplate to a workpiece. The apparatus comprises a zinc-nickel electroplating bath ( ) comprising an amine additive, such as poly(alkyleneimine), which is capable of being oxidized in the bath to cyanides. The bath has a pH more than about A cathode workpiece ( ) is positioned in the bath. An anode assembly ( ) is also positioned in the bath. The anode assembly comprises an enclosure ( ) defining an anolyte compartment ( ), at least a portion of the enclosure being an ion exchange membrane ( ). An anolyte ( ) is positioned in the compartment. An insoluble metal anode ( ) is immersed in the anolyte. The anolyte is a conductive salt or base solution and the anode is a metal or metal coating selected from the group consisting of nickel, cobalt, iron, chromium and alloys thereof.

Zinc-nickel electroplating

An alkaline zinc-nickel electroplating bath comprises zinc ions, nickel ions, a primary brightener which is an N-methylpyridinium compound substituted at the 3-position of the pyridine ring with a carboxylate group or a group hydrolyzable to a carboxylate group and a secondary brightener which is an aliphatic amine. An example of a preferred brightener is N-methylpyridinium-3-carboxylate or a salt thereof. A preferred polyamine is a polyethyleimine. By the present invention, a mirror bright zinc-nickel deposit can be obtained having more than 4% by weight nickel, without blistering or decomposition of the primary brightener.

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Lakewood, OH, United States of America

Robert E Frischauf