Abstract: An aqueous acidic electrolyte and process for electrodepositing zinc alloys comprising zinc-nickel, zinc-cobalt and zinc-nickel-cobalt on a conductive substrate incorporating a brightener system including a ductilizing agent present in an amount sufficient to reduce stress and fracturing of the zinc alloy electrodeposit providing for improved corrosion resistance of the deposit. The ductilizing agents are sulfonates of an aldehyde or ketone.

Abstract: An aqueous concentrate adapted for dilution with water for use in the make-up and replenishment of zinc or zinc alloy electroplating baths of the chloride and the mixed chloride types comprising an aqueous solution containing zinc chloride in an amount of about 10 to about 400 g/l, a hydrophobic organic brightening agent selected from the group consisting of aryl aldehydes, halo aryl aldehydes, aryl alkenyl ketones, aryl alkenyl aldehydes, heterocyclic alkenyl ketones and aldehydes as well as mixtures thereof generally present in an amount of about 10 up to about 200 g/l and a solubilizing agent comprising an alkyl phenyl sulfonate compound present in an amount of at least about 10 g/l up to an amount in consideration of the concentration of the zinc chloride and organic brightening agent present in the concentrate.

Abstract: An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved clarity and hardness and to impart improved corrosion resistance thereto. The solution contains effective amounts of chromium ions substantially all of which are in the trivalent state, hydrogen ions to provide a pH of about 1.2 to about 2.5, an oxidizing agent, a bath soluble and compatible silicate compound present in an amount to provide improved corrosion protection to the substrate and increased hardness to the passivate film and at least one additional metal ion selected from the group consisting of iron, cobalt, nickel, molybdenum, manganese, aluminum, lanthanum, cerium, lanthanide mixtures as well as mixtures thereof. The treating solution may optionally further contain halide ions, a carboxylic acid or salt and a wetting agent.

Abstract: A process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved corrosion resistance and hardness which comprises the steps of providing an aqueous acidic solution containing effective amounts of chromium ions substantially all of which are in the trivalent state, hydrogen ions to provide a pH of about 1.2 to about 2.

Abstract: Novel alkylated hydroxyl aryl compounds, such as vanillin which has been alkylated with 3-chloro-2-hydroxypropyltrimethylammonium chloride, are useful as additives in alkaline zinc electroplating baths.

Abstract: 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 selec

Abstract: 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:At least one copper compound providing copper ions andAt least one zinc compound providing zinc ions and as cooperating additivesA salt of a condensed arylsulfonic acid andA free aldehyde or its bisulfite adduct.

Abstract: 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.

Abstract: 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:A. at least one nitro substituted organic compound containing at least one solubilizing group;B. at least one organic amine or polyamine or substituted amine or polyamine;C. at least one aliphatic carboxylic acid or salt thereof, or a compound which will yield said carboxylic acid or salt thereof in solution, further characterized in that said aliphatic carboxylic acid or salt thereof additionally contains at least one substituent group selected from --NH.sub.2 or quaternary amine salts thereof, --OH, or --SH; andD. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.By nickel-iron alloy deposit is meant a deposit containing from about 5 to 90 percent by weight iron with that portion which is not iron being primarily nickel or nickel and cobalt.

Abstract: 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:A. at least one nitro substituted organic compound containing at least one solubilizing group;B. at least one organic amine or polyamine or substituted amine or polyamine; andC. at least one aliphatic carboxylic acid or salt thereof, or a compound which will yield said carboxylic acid or salt thereof in solution, further characterized in that said aliphatic carboxylic acid or salt thereof additionally contains at least one substituent group selected from -NH.sub.2 or quaternary amine salts thereof, -OH, or -SH.By nickel-iron alloy deposit is meant a deposit containing from about 5 to 90 percent by weight iron with that portion which is not iron being primarily nickel or nickel and cobalt. Although small amounts of impurities such as copper, zinc, cadmium, lead, etc.

Abstract: 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.

Abstract: 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:A. at least one nitro substituted organic compound:B. at least one organic amine or polyamine or substituted amine or polyamine; andC. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.By nickel-iron alloy deposit is meant a deposit containing from about 5 to 90 percent by weight iron with that portion which is not iron being primarily nickel or nickel and cobalt. Although small amounts of impurities such as copper, zinc, cadmium, lead, etc. may also be present, the major constituents of the alloy are nickel and iron.