Abstract: An improved aqueous electroless nickel plating bath and process for chemically depositing nickel on a substrate comprising an aqueous solution containing nickel ions, hypophosphite ions, a complexing agent, preferably a buffering agent and a wetting agent, and a small but effective amount of a sulfonium betaine compound sufficient to control the rate of nickel deposition and the concentration of phosphorus in the nickel deposit, preferably, in further combination with supplemental organic and/or inorganic rate stabilizers. The invention further contemplates a process for rejuvenating an electroless nickel bath which has been rendered inoperative due to the presence of excessive concentrations of supplemental stabilizing agents by the addition of a controlled effective amount of a sulfonium betaine compound sufficient to restore the bath to an operative plating condition.

Abstract: A method and apparatus for simultaneously measuring the thickness of individual layers of a multilayer plated deposit, the electrochemical potential difference between the layers, and the relative polarity of the layers, is disclosed.

Abstract: This invention relates to a process and composition for the preparation of an electro-deposit which contains; at least one metal selected from the group consisting of nickel and cobalt 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 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; the improvement comprising the presence of 5 .times. 10.sup.-6 moles per liter to 0.5 mole per liter of an unsaturated cyclosulfone exhibiting the following generalized structural formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.

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: 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 and cobalt 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 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; the improvement comprising the presence of 5.times.10.sup.-6 moles per liter to 0.5 moles per liter of a .beta.-substituted, .gamma.-substituted, or .beta.,.gamma.

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.

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: 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 and cobalt 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 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 effective amount of at least one additive; the improvement comprising the presence of 10 micromoles per liter to 2000 micromoles per liter of an organic disulfide compound or salt thereof having the formula:R.sub.1 --S--S--R.sub.2wherein R.sub.1 and R.sub.