SU1055781A1 - Aqueous electrolyte for bright copper plating - Google Patents

Description

The invention relates to galvano ;; styling, in particular to the deposition of copper coatings, and can be applied in mechanical engineering and instrument making, where plastic and glossy copper coatings are obtained. Copper electrolyte is known, containing copper sulphate, sulfuric acid, hydrazine and hydrazine derivative jQ. The disadvantage of this electrolyte is the impossibility of obtaining shiny and ductile copper coatings from it. The closest to the proposed technical essence and the achievement of the most effective effect is the electrolyte of brilliant copper, containing copper sulfate sulfuric acid and benzotriazole. However, the known electrolyte has insufficient scattering method. nosti, and the coatings obtained from neg are not sufficiently plastic. The purpose of the invention is to increase the scattering ability of the copper electrolyte and increase the plasticity of the coating. This goal is achieved by the fact that aqueous electrolyte is a brilliant honey, containing copper sulphate. sulfuric acid and benotrialose as a brightening agent, additionally contains carbethoxyhydroelement of the dental aldbgid or ketone of the general formula Ag-c 1ns-sogsu, R where Ap is 4-hydroxy-3-methoxyphenyl, 2-hydroxyphenyl; B - B; CH, In the following ratio of components, g: Copper sulfate. 200-250 Sulfuric acid 40-50 Benzotriazole 1, 21 Three electrolytes are prepared, the compositions of which are presented in Table 1, Table

Aromatic aldehyde or ketone carbethoxyhydraion, mol / g

The electrolyte is prepared as follows.

Copper sulphate is dissolved in water heated to 5 ° -6 ° C, filtered, then mixed with sulfuric acid. The electrolyte is processed for 4-6 hours in order to remove impurities, filtered and the calculated amount of benzotriazole and carboethoxy hydrazone of aromatic aldehyde or ketone is added. For the preparation of the electrolyte, substances of the grade h .. a are used.

Carbethoxyhydrazone of vanillin or carbethoxyhydrazone o-sgsiac-j tofenone is used as carbethoxyhydrazone of aromatic aldehyde or ketone. They are ba, -4

r4

ten

ten

acidic soluble crystals. They are obtained by condensation of equimolar amounts of an aromatic aldehyde or ketone with carbethoxyhydrozone in an alcohol medium under acid catalysis by the reaction

b-CrO + HjN-NH-CO.jCjHg- R

- Ai-C H-NH-CO, jCjHg H20.

R

Electrically copper deposition is carried out at room temperature (18-25cJ and a cathode current density of 2-6 A / dm. The properties of copper precipitates obtained from the proposed electrolyte are tested according to the following methods.

The gloss of the electrolytic precipitates is measured on a photoelectric brightness meter PB-2 in relative units relative to UV glass, the gloss of which is 65 rel. The range of values 1-10 corresponds to a matte surface / 10-50 - semi-gloss, 50-90 - shiny, 90-100 mirror.

The scattering power is determined by the Hering-Blk 4a method using the near and far cathodes.

The hardness of copper precipitation is measured on a PMT-3 device using the static indentation of a diamond pyramid under a load on an indenter of 20 g,

. The plasticity of the coating is emitted by measuring the rotational speed up to paispynie and samples of carbon steel wire U8A with a diameter of 0.8 mm when twisting on a K-5 machine.

The appearance of copper coatings is studied using a microscope.

The adhesion strength of the coating to the substrate is determined by the scratching method.

Samples are mounted in a special cell of 5 pieces with a secure contact. Conduct mathematical processing of the results.

The working length of the samples is 100 mm. The preparation of the samples consists in polishing with micron sandpaper and degreasing the Viennese limestone.

When studying the physicomechanical properties of electroplating, a 500 ml rectangular bath is used. The cathode is a plate of 5022-2 mm from, the anode is electrolytic copper. The non-working side is insulated with glue.

The porosity of the copper deposits is determined by 3247-46. Current output using a copper coulometer.

The test results of the brilliant electrolyte are summarized in Tables 2 and 3.

.Table 2

The electrolyte is of a brilliant copper. It allows to obtain plastic galvanic deposits with a fine-crystalline structure, a shiny and mirror-like surface, and almost non-porous. The electrolyte has a high scattering ability, stable

Table 3

in work, does not require private and complex adjustments, is not toxic.

Electrodeposition provides good adhesion of the copper coating to the steel base without the use of an intermediate sublayer.

Claims (3)

1./ WATER BRILLIANT COPPER ELECTROLYTE, containing copper sulfate, sulfuric acid and benzotriazole as a brightening additive, characterized in that, in order to increase the dissipation ability of the electrolyte and increase the plasticity of the coating, the electrolyte additionally contains a carbethoxyhydrazone aromatic aldehyde, ketone or ketone Ar-C = N-NH-CO _z e ₂ "5 R where Ap is 4-hydroxy-3-methoxyphenyl; 2-hydroxyphenyl; R is H; CH ₃ ; in the following ratio of components, g: Copper sulfate 200 - 250 Sulfuric acid 40 - 50 _ Benzotriazole 1.2 · 10-1.2 · 10 ~ ^ζ Carbethoxyhydrazone aromatic aldehyde _{? 4} or ketone, mol 10 ~ - 10 Water, l To 1 2. The electrolyte according to claim 1, with respect to the fact that it, as a carbethoxyhydrazone of an aromatic aldehyde or ketone, contains vanethyl carbethoxyhydrazone. 3. The electrolyte according to claim 1, characterized in that it contains carbethoxyhydrazone o-oxyacetophenone as carbethoxyhydrazone of aromatic aldehyde or ketone. ~ 1055.781>