SU1225279A1 - Bright nickel-plating electrolyte - Google Patents

Description

The invention relates to the field of electroplating, in particular to the electrolytic production of bright nickel coatings. The purpose of the invention is to reduce internal stresses and increase the plasticity of nickel coatings.

According to the invention, the electrodeposition is carried out at AZ-33 C, pH 3.0-4.0. When using compressed air mixing, the cathode current density is 4-6 A / dm. At the same time, the nickel-plating electrolyte contains aromatic sulfamide or sulfimide 2-butyndiol-1,4 and / 5-hydroxyethylamide of cinnamic acid as organic additives.

The electrolyte according to the invention has the following composition (g / l):

Nickel sulfate (in terms of sulfate ion) 12-100 Nickel chloride or

rub (in terms of

those for chloride ion) 7-40 Boric acid 30-50 Aromatic sulfamide or sulfimide 0.3-3.0 2- Butindiol-1,4 0.03-0.03-Oxyethylamide

cinnamic acid 0.3-0.6 The electrolyte is prepared as follows.

. The calculated amount of nickel salts and boric acid are dissolved in water, after which the aromatic sulfosulfur compound, 2-butyndiol-1,4., And c-p-hydroxyethylamide are added to the solution.

A-Cinnamic acid oxyethylamide is prepared as follows.

In a round bottom flask equipped with a mechanical stirrer, a thermometer and a dropping funnel, 3.03 ethanolamine are placed; 3.03 triethylamine and 30 ml of acetonitrile. With stirring, a solution of 8.33 g of cinnamic chloride in 30 ml of acetonitrile is added at a rate such that the temperature of the mixture is not

five

0

five

o

,

50

0

rose above. At the end of the addition of the total amount of cinnamic acid chloride, the reaction mixture is stirred at room temperature (18–20 ° C) for another 0.3 h. The precipitated substance corresponding to the formula CyH, g-CH, CH-COXH, CH, OH is filtered and recrystallized - roll out of methanol.

The yield is 70%.

Concentrates of injected additives used provide the best combination of properties of the resulting coatings.

Increasing or decreasing the concentration of additives above or below the indicated: .h limits promotes the growth of internal stresses and reduces the gloss of coatings.

Examples illustrating the invention are presented in the table, in which example (14) is also given for a known nickel electrolyte.

The hardness of the coatings was determined by the Vickers method, the scattering ability of the electrolyte by the method of Harring and Blum.

As can be seen from the presented data, the electrolyte according to the invention makes it possible to obtain plastic, low internal stresses, bright nickel coatings at half the concentrations of nickel salts compared with the known electrolytes, which provides significant savings in expensive nickel salts produced in the manufacture.

The reflectivity of the coatings with respect to the silver mirror is 80-90%, the microhardness of the coatings is 340-630 kgf / mm. Current output 96-99%. The dispersing ability of the electrolyte is 6-8%.

The invention may be used in automotive, engineering, instrument-making and other industrial areas for decorative finishing and corrosion protection of products from copper, steel, copper and zinc alloys, aluminum, etc.

Sulphate

akvl. (at.

recalculated

ka sulfate)

g / l48 W 48 12 12 12 49 49 49 100 100 100 48

Chloride

nickel (in

recalculated

to chloride),

p / l 77736 36 36

Chloride

sodium (c.

recalculated

to chloride),

g / l-- --M AND AND

40 40 40

Acid

born

(g / l) 30 30 30 30 30 30 50 50 50 40 40 4030

Saccharin

(g / l) 0.5 0.5 0.5 1.5 1.5 1.5 1.5 3.0 3.0 3.0 3.0 Benzene sulphamide (g / l)

Fe ylpropilamvd

(g / l)

2-Booth ndiop-1, 4

(g / l) 0.05 0.05 0.05 0.04 0.04 0, OA 0.03 0.03 0.03 0.05 0.05 0.05

/ - Oxyethyme-cinnamic acid, (g / l) 0.3 0.3 0.3 0.5 0.5 0.5 0.6 0.6 0.6 0.5 0.5 0.5 0.5

Teteratu-.

ra, (C) 50 50 50 50 50 50 50 50 50 50 50 -50 50

h - -.

P from the awn,

current

(A / dm) 2.0 4.0 6.0 2.0 4.0 6.0 2.0 4.0 4.0 6.0 2.0 4.0 6.0 4.0

pH (units) 4.0 4.0 4.0 4.0 4.0 4.0 3.0 3.0 3.0 4.0 4.0 4.0 4.0 4.0

 Included.

iapr canopy ..

(kgf / cm) -880 -750 -810 -660 -450 -440 -920 -880 -690 --93O -890 -300 380

Regarding .e ,.

elongated

SJ4.0 5.9 5.9 5.9 8.8 8.84.0 6.0 6.0 4.0 6.0 4.0 1.8

M & I

40 40 40

5.3

1.0 1.0 1.0

0.4

Claims (2)

ELECTROLYTE BRILLIANT NIKE-. PIRIWA, containing nickel sulfate, nickel or sodium chloride, boric acid, aromatic sulfamide or sulfimide and an unsaturated carboxylic acid amide with phenyl radical, characterized in that, in order to reduce internal stresses and increase the ductility of the coatings, the electrolyte additionally contains 2-butynediol-1 , 4, and as an amide of an unsaturated carboxylic acid with a phenyl radical d-hydroxyethylamide cinnamic acid in the following ratio of components Nickel sulfate (in terms of sulfate ion) Nickel or sodium chloride (in in terms of chloride ion) Boric acid Aromatic sulfimide or sulfonamide 2-Butynediol-1,4 β-hydroxyethylamide cinnamic acid SU _p . 1225279 1225279.