SU1346693A1 - Solution for chemical application of nickel-boron alloy coatings - Google Patents

Abstract

The invention relates to the chemical deposition of metallic coatings from solutions, in particular from a nickel-boron alloy, on a copper surface. The purpose of the invention is to simplify the coating process by allowing spontaneous activation of copper. The solution contains, g / l: nickel sulfate 10-15; dimethylaminoborane 2-4; sodium citrate 5-15; sodium acetate 10-15; diethylmalonat 1.0-2.5; sodium lauryl sulfate 0.02-0.04. The proposed combination of components and their ratios ensures an activation time of 9-24 s, a nickel yield of more than 0.6 mg / mg of DMAB, a deposition rate of about 5 µm / h, obtaining light smooth, strongly adhering to the base coatings with internal stresses

Description

The application of metallic coatings, in particular, from nickel-boron alloy, can be used in radio electronics, instrument making, and other areas of technology in the manufacture of structural elements with protective, resistive, soldered, etc. prescribed coatings.

The purpose of the invention is to simplify the coating process by both being wet with magnesium oxide and decapitated.

Sintering possibilities spontaneously in ammonium persulfate solution 20 g / l

activation of copper. at room temperature for

The invention is carried out in the following ig2-3 minutes. Nickel plating process lead

at a loading density of 1 dm / l and a temp of 800 ml of water successively at 65 t,

formulations of diethylmalonate (di-specific formulations of solutions and

ethyl malonic acid ester), the results are presented in

sodium citrate, sodium vinegar-20 table.

A, 5 A, 8 12 2i

1.65 6.73 60 4

29.6 53.5 33.8 73.4 22.9

 0.60 0.66 0.63 0.43 0.46

Appearance of the coating

Examples: - light, tightly coupled with the base - - matte or dark.

It follows from the table that the combination of components and their ratios proposed in the invention (solutions 1–3), in contrast to sulfuric acid, ethyl acetate, sodium salt), nickel sulphate and dimethylaminoborane (LMAB), after which the solution is brought to 1 liter. In this case, the pH of the solution is 6.9-7.3, depending on the ratio of the components. Covered products are pre-cleaned. In particular, copper plates 0.01x2.0x2.5 cm degrease0, 00 I 5

5-20 20

1.65 6.73 60 4

5-6

The solution is unstable

a known solution (6, 9, 10) spontaneous activation of copper (activation time in a solution is 9-24 s), high solution stability (nickel yield,

31 3

Claims (1)

more than 0.6 mg / mg DMAB), the rate of precipitation is rather high for the type of chemical nickel plating solutions under consideration - about 5 µm / h, the high quality of the resulting coating is light, smooth, strong-bonded to the substrate, internal stresses (3-5) 10 kg / mm. Deviation from the proposed qualitative (solutions 7 and 8) or quantitative (solutions 4 and 5) content of the components is accompanied by a sharp deterioration in the above indicators. The invention of the solution for the chemical coating of nickel-boron alloy mainly on the copper surface, containing nickel sulphate, dimethylaminoborane, sodium citrate, sodium acetate, derivative Compiled by A. Rychagov Editor G. Volkova Tehred M. Didgk Order 5098/27 Edition 936 VNIIG1N USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4  J malonic acid, characterized in that, in order to simplify the coating process, by allowing spontaneous activation of copper, it additionally contains sodium lauryl sulfate and, as a malonic acid derivative, diethyl malonate with the following ratio of components, g / l: Nickel sulfate 10-15 Chimethylaminoborane 2-4 Sodium citrate5-1 5 Sodium acetate 10-15 Diethylmalonate 1.0-2.5 Lauryl sulfate sodium 0.02-0.04 Proofreader M, Maxi. Shshinets