The present invention relates to the electrodeposition of transition metal and rare earth alloys from aqueous solutions to form thin films. The present invention which comprises the preparation of suitable mixtures of water soluble compounds containing the desired transition metal (TM) and rare earth (RE) elements, establishing appropriate bath conditions and applying specific current densities across the bath solution to cause a film with the desired properties to be deposited on a target substrate.

Aqueous electrodeposition of rare earth and transition metals

A method of electroplating a crack-free hard chromium deposit comprises having present in the electroplating bath a complex halogen-containing compound which disassociates in an aqueous solution while maintaining the bond of a halogen in the complex. A plating voltage is used which periodically superimposes high voltage pulses on the base voltage.

Process for the treatment of metal surfaces by electro-deposition of metal coatings at high current densities

Rare earth-nickel-cobalt-boron multi-element alloy anticorrosion and wear-resistant plating, electroplating liquid and preparation method of electroplating liquid

Desirable electrodeposition of bright chromium plate can be made onto a substrate from a portable plating device having an absorbent mass containing chromic plating medium. The medium contains a complex, water-soluble chromic compound for plating, which compound contains carboxylic acid constituents and halogen constituents. A uniform, bright chromium plate can be readily obtained on the substrate at a desirable current density that avoids the problems accompany ying portable plating at elevated temperature.

Chromium plating medium for a portable plating device

An aqueous acidic chromium electroplating bath comprising 200 to 550 g/l of chromium trioxide, 1 to 18 g/l of strontium sulfate, 2 to 30 g/l of potassium silicofluoride, 2 to 8 g/l of potassium dichromate and 4 to 50 g/l of 2,2-dichloromalonic acid or salt thereof.

Chromium electroplating baths and method of electrodepositing chromium

This invention relates to a process and composition for the preparation of an electrodeposit which contains at least one metal selected from the group consisting of nickel, cobalt and iron, which comprises passing current from an anode to a cathode through an aqueous plating solution containing at least one member selected from the group consisting of cobalt compounds and nickel compounds and iron compounds to provide cobalt, nickel and ferrous ions for electrodepositing cobalt, nickel, nickel-cobalt alloys, nickel-iron alloys, or nickel-cobalt-iron alloys the improvement comprising the presence of an effective amount of at least one compound or salt which in solution yields at least one member selected from the group consisting of cations of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium in the said baths in a single or combined concentration of 0.1 gram per liter to 20 grams per liter.

Prevention of anode bag clogging in nickel iron plating

Process and compositions for electroplating chromium

Method of electroplating chromium and compositions therefor

In accordance with certain of its aspects this invention relates to a process and composition for the prevention of anode bag clogging in the preparation of an electrodeposit which contains nickel or; binary or ternary alloys of the metals selected from nickel, iron and cobalt; which comprises passing current from an anode to a cathode through an aqueous acidic electroplating solution containing at least one member selected from the group consisting of nickel compounds and cobalt compounds and which may additionally contain iron compounds providing nickel, cobalt and iron ions for electrodepositing nickel, cobalt, nickel-cobalt alloys, nickel-iron alloys, cobalt-iron alloys or nickel-iron-cobalt alloys and containing an amount of oxalic acid break-down product; the improvement comprising the presence of 2×10 -3 mole per liter to 1.0 mole per liter of a calcium compound or salt thereby preventing the clogging of anode bags by precipitation of calcium oxalate.

Anode bag benefaction

1294174 Electro-depositing chromium; lead alloys M & T CHEMICALS Inc 2 June 1970 [5 June 1969] 26593/70 Headings C7A and C7B Chromium is deposited from an aqueous acidic chromium electro-plating bath using as anode an alloy of:- Pb 90-99% Sn 1-7% one or more of Te, T1, Cd 0A005-5% The bath may contain chromic acid and sulphate ion, eg as sulphuric acid or strontium sulphate and silicofluoride ion, eg as hydrofluorsilicic acid Temperatures of 15-95‹ C and plating currents of 1-60 amps/sq dm may be used

Hyman Chessin

Papers

Prevention of anode bag clogging in nickel iron plating

Process and compositions for electroplating chromium

Method of electroplating chromium and compositions therefor

Anode bag benefaction

Improvements in or relating to electrodepositing chromium using lead base alloys