SU855084A1 - Complexing additive to sulfuric acid electrolyte for metal precipitation - Google Patents

Description

noticeably, and at a concentration above 0.08 g / l, gray and dark spots begin to appear on the electroplated coatings.

Depending on the degree of acidity of the electrolyte used, dithizone is dissolved in concentrated sulfuric acid or in a saturated solution of alkali metal oxide hydrate before being introduced into the electrolyte. Dithizone can be used as an independent complexing agent, as well as in conjunction with other complexing agents, for example, polyethylene polysmin, citrate, ammonia. .

In order to study the effect of the complexing agent on the technological parameters of the electrolyte and the quality of the precipitates obtained, the following electrolytes have been polled.

Example 1 The electrolyte tinning containing, g / l:

Sulphate tin 30 Sulfuric acid 120 Sodium sulphate 40 Phenol9

Clay table

Dithizon0.04

Example 2. The electrolyte cadmium, contents, g / l:

Cadmium sulfate 50 Acid chamois 50

Sodium sulfate 50 Phenol15

Glue table rny 12 Ditizon0,035

Example 3 Zinc electrolyte containing, g / l:

Zinc sulfate 50 Caustic soda 100

Polyethylenepolyamnn 50 Dithizon0.08

Example 4 Copper electrolyte containing, g / l:

Copper sulfate 195 Sulfuric acid 50 Ditizo and 0.08

Of the electrolytes of Example 1, coatings are applied to brass plates, for all others, to steel plates.

The degree of gloss was measured. on the gloss meter FB-2.

The dispersing ability of the electrolyte is determined by the method of HeringBlum.

5 For corrosion resistance, they are tested in an atmosphere of saturated vapor of a 3% aqueous solution of sodium chloride.

The adhesion of the coating to the substrate is determined by applying the mesh and by bending the sample plate through 180 °.

The test results are shown in the table.

Claims (3)

The use of dithione as a complexing agent for metals in electrolytic coating allows to obtain high-quality crystalline glossy and semi-bright acidic electrolyte residues at relatively low concentrations of this component. The introduction of dithizone into electrolytes allows one to expand the range of current density, to increase the scattering ability of the electrolyte. Electrolytes using this complexing agent are easy to manufacture and stable in operation. 78 Claims of the Invention The use of dithizone (diphenylthiocarbaeone) of the formula CnH, MNH.SM-CsiI5 ° 1 5M as a complex-forming additive to sulfate electrolytes for the deposition of metals. Ь50848 Sources of information taken into account during the examination 1. L. Vainer, M. Daso and M.L. electrochemical coating technologists. 5 mechanical engineering, L., 1972. 2. USSR author's certificate 539096, cl. C 25 D 3/26, 1974. 3. Kreshkov A.P. Fundamentals of analytical chemistry, M., Khimi, 1976, p. 255.