SU1539240A1 - Electrolyte for plating with nickel-iron alloy - Google Patents

Abstract

The invention relates to electroplating, in particular to electrolytes for producing precipitates of nickel-iron alloy, and can be used in various industries in the manufacture of parts by electroforming. The purpose of the invention is to facilitate the separation of the coating and increase the percentage of iron in the alloy. A decrease in the adhesion of precipitation, ensuring their good separation from the matrix, and an increase in the percentage of iron in the alloy is achieved due to the fact that the electrolyte for producing electroforming sediments, containing, g / l: sulfate (hydrate) nickel 100 - 120, chloride (hydrate) nickel 75 - 140, sulphate (hydrate) iron (monoxide) 15 - 16, boric acid 35 - 40, saccharin 2.0 - 2.5, citrate (hydrate) sodium or potassium 3 - 5, additionally contains glycerin 8 - 15. Electrolyte provides high-quality galvanoplastic precipitates with nickel alloy l-iron thickness up to 0.1 - 0.15 mm. The relatively low adhesion of precipitation with a 12X18H10T stainless steel matrix (precipitation separation, angle of 90 °) allows them to be separated from the matrix without damage. The iron content in the alloy is 43 - 46%. 1 tab.

Description

The invention relates to electroplating, in particular to electrolytes for producing precipitates of nickel-iron alloys, and can be used in various areas of hardening in the manufacture of parts by electroforming.

The purpose of the invention is to facilitate the separation of coatings and an increase in the percentage of iron in the alloy.

The invention is illustrated by specific examples of testing the electrolyte, the speech samples of which are presented to the GLOLICR.

The preparation of the electrolyte is carried out as follows.

A separate container of 2/3 volume is filled with distilled water and heated to 30 ° C. With stirring, calculated amounts of boric acid, sulfuric acid nickel, and nickel chloride are introduced (in this order). Then, activated BAU brand (GOST 6217-74) is added to the resulting solution at the rate of 3 g / l and stirred with compressed air for 3-5 hours. After that, the separated solution is filtered into working fluid.

the bath is adjusted with a solution of H2SO2 or a solution of Na2C03 to a pH of 2 and worked out at a cathodic current density of 0.3 A / cm2, using a corrugated steel cathode previously coated with nickel and an anode made of nickel NPA-1 (GOST 21 32- 75). The study of the electrolyte is carried out within 24 hours, maintaining the temperature at 50 ° C. At the end of the study, the nickel concentration in the electrolyte is determined. The optimum content of nickel salts in terms of metal should be 38-42 g / l. After that, the calculated amount of sodium or potassium is citric acid, iron (nitrous) sulfuric acid, saccharin and glycerin successively in the electrolyte. After complete dissolution of the components while stirring, the electrolyte is allowed to settle. Electrolyte correction is made according to the chemical analysis for iron and nickel content. The stabilizing additives are adjusted once every 2-3 days.

The nickel-iron alloy was deposited at 28–30 ° C, a cathode current density of 1.3–1.7 A / dmg using combined anodes of NPA-1 nickel and steel of the 20 grade (with 6: 1 ratio). anodes from supervinvar brand 32KD,

When testing the electrolyte, the precipitation of nickel-iron alloy deposits is carried out on a matrix of 12X1JAN10T stainless steel. The thickness of the precipitation of the alloy can reach 0.1-0.015 mm. The adhesion of the precipitation of the alloy with a thickness of 10 µm with the matrix is determined according to GOST 9302-79 by the method of bending the matrix through an angle c) 0 „.

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As shown by the results of testing, the proposed electrolyte in the table provides for obtaining high-quality galvanoplastic precipitates by a nickel-iron alloy. The relatively low adhesion of precipitation to the matrix (separation of sediments occurs at 3-4 bends of the matrix at an angle of 90 °) allows separation from the matrix without damage, and increasing the iron content in the alloy to 43–46% saves nickel.

Claims (1)

Invention Formula Electrostrolite for producing coatings of nickel-iron alloy, mainly for electroplating manufacture of products containing nickel and iron salts, boric acid, saccharin and citrate ions, characterized in that, in order to facilitate the separation of coatings and increase the percentage of iron in the alloy, citrate it contains ions in the form of sodium or potassium citric acid, additionally contains glycerin, in the following ratio of components, g / l: Nickel sulfate100-120 Nickel chloride75-140 Ferrous sulphate fermented15-16 Bourne acid 35-40 Saccharin 2.0-2.5 Sodium or potassium citrate3-5 Glycerin8-15 Nickel sulfuric acid (hydrate) Nickel chloride (hydrate) Iron (nitrous oxide) sulfurous (hydrate) Gluconic acid Acid and citric acid Bourne acid Saccharin Sodium or potassium lemon no-acid (hydrate) Glycerin A mixture of I, 4-Sutindiol and acrylic aldehyde (pH Temperature, C Current density Iron content in alloy,% Sediment adhesion with matrix according to GOST 9302-79 (separation of sludge from matrido with the number of bends) Electroforming quality 46 28 AT eight eight 9-10 When separating from the matrix, the integrity of the sediments is disturbed due to their damage.