Victor J Waldman

US Patent:

55781870, Nov 26, 1996

Filed:

Oct 19, 1995

Appl. No.:

8/545354

Inventors:

Mark W. Zitko - Meriden CT
John H. Commander - Old Saybrook CT
Victor J. Waldman - Milford CT

Assignee:

Enthone-Omi, Inc. - West Haven CT

International Classification:

C25D 500

US Classification:

205191

Abstract:

A process is provided for plating zinc die cast substrates with an electroless nickel coating comprising depositing an electrolytic zinc layer on the substrate followed by depositing a first electroless nickel layer on the electrolytic zinc layer using a first alkaline electroless nickel bath and then depositing a finish electroless nickel layer on the first electroless nickel layer using an acidic electroless nickel bath. In a preferred embodiment, a second electroless nickel layer is deposited on the first electroless nickel layer using a second alkaline electroless nickel bath. It is preferred that at least one and preferably all of the electroless nickel baths contain an effective amount of antimony ions to enhance bath stability and metal to metal adhesion. Mechanical cleaning of the zinc die casting before plating is preferred.

US Patent:

54358981, Jul 25, 1995

Filed:

Oct 25, 1994

Appl. No.:

8/328367

Inventors:

John H. Commander - Old Saybrook CT
Victor J. Waldman - Milford CT

Assignee:

Enthone-OMI Inc. - West Haven CT

International Classification:

C25D 322
C25D 356

US Classification:

205245

Abstract:

An aqueous bath for electrodepositing zinc and zinc alloys wherein the alloying metals are selected from the group consisting of iron, cobalt and nickel and containing an effective additive amount of a quaternary ammonium polymer to produce enhanced deposits. A process for electrodepositing zinc and zinc alloys using the baths of the invention is also disclosed.