M&t Chemicals, Inc.

Ronald J Lash

Edward P Harbulak

Otto Kardos

Frank Passal

In accordance with certain of its aspects this invention relates to a process and composition for the preparation of an electrodeposit which contains iron; at least one metal selected from the group consisting of nickel and cobalt or; binary or ternary alloys of iron and of the metals selected from nickel and cobalt; which comprises passing current from an anode to a cathode through an aqueous acidic electroplating solution containing iron and at least one member selected from the group consisting of nickel compounds and cobalt compounds providing nickel, cobalt and iron ions for electrodepositing nickel-iron alloys, cobalt-iron alloys or nickel-iron-cobalt alloys, an effective amount of at least one additive; the improvement comprising the presence of at least one complexing compound consisting of a poly-substituted aryl compound containing at least one carboxylic acid group defined as --COOH, another substituent independently selected from hydroxy or carboxy, and one or more substituents independently selected from sulfo, defined --SO.sub.3 H, or sulfoalkyl groups.

Electroplating iron group metal alloys

In accordance with certain of its aspects, this invention relates to a process for the preparation of an electrodeposit which contains iron and at least one metal selected from the group consisting of nickel and cobalt which comprises passing current from an anode to a cathode through an aqueous plating solution containing an iron compound and at least one member selected from the group consisting of cobalt compounds and nickel compounds providing cobalt or nickel ions for electrodepositing alloys of iron with cobalt and/or nickel and containing an effective amount of at least one substituted or unsubstituted dihydroxybenzene complexing agent.

Alloy plating

The novel process of this invention for electroplating a bright brass onto basis metal comprises passing current from an anode to a basis metal cathode through an aqueous alkaline cyanide plating solution containing:

Brass plating

A composition and process for selectively removing nickel-iron alloys from a metal substrate which comprises contacting said metal surface with an aqueous bath containing:

Stripping of electroplated nickel-iron alloys from ferrous substrates

Stripping of electroplated nickel-iron alloys

This invention relates to a composition and process for electrodepositing semi-bright to bright brass from an aqueous alkaline cyanide electroplating solution containing at least one copper compound providing copper ions, at least one zinc compound providing zinc ions, and as a cooperating additive 0.1 to 10 grams per liter of at least one compound having the following generalized structural formula: ##STR1## where R.sub.1 and R.sub.2 are separately hydrogen, an alkyl group such as methyl, ethyl, isopropyl, etc., or a hydroxy alkyl group such as hydroxy methyl, hydroxy ethyl, etc. and R.sub.3 is hydrogen or a straight or branched chain alkyl sulfonic or carboxylic acid of from one to ten carbon atoms, or salts thereof, or a straight or branched chain hydroxy alkyl group of from one to five carbon atoms.

A composition and process for selectively removing nickel and nickel alloys with iron and/or cobalt from a surface of a metal substrate which comprises contacting said metal surface with an aqueous bath containing:

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Warren, MI, United States of America

Ronald J Lash