SU1236008A1 - Electrolyte for copper plating of steel - Google Patents

Description

I12360082

The invention relates to the field of industrial engineering and other areas of electrolytic metal deposition.

Lev, in particular to the displaced iy. The purpose of the invention is to increase the brightness of day steel in acidic electrolytes and the elasticity of coatings, is diminished and can be used for coating 4; their roughness and intensification, as well as the copper sublayer in the process of applying a multilayer L1 x protective decorative and decorative coatings in

ti process.

The table presents the composition and properties of electrolyte.

Copper sulfate,

g / l

Maleic acid

g / l

Lactic acid

g / l

Cobalt nitrite

sodium, g / l

Sodium tripolyphosphate, g / l

Sodium phosphate dvuhzameshchenny, g / l

PH Temperature

Current density, A / dm

The deposition rate of 5, mcm / m0,6

Shine% 92

Covering ability according to Pan,% 100

Field scattering power% 33

Roughness of coatings, µm 0,32-0,46

1 1hardness, to g / mm 252

Elasticity, score1

 The purpose of the invention is to improve the elasticity of coatings, reducing their roughness and intensification.

ti process.

The table presents the composition and properties of electrolyte.

48

80

50

thirty

40

225

120

22

45

24

140

12

0.4-4

68

Oh, 10-0.8

Light pink coating

100

66-70% in Hull's cell

0, 44 0.24-0.37 0.82

281299

115

The composition of the electrolyte and its properties

Base material

Electrolyte stability, Ah / l without stirring at D 7A / dm

Coating thickness 9-12 microns

Coating thickness 15-20 µm

The process is carried out at a pH of 1.1-2.4 at a temperature of 15-35 ° C and a current density of 4-12 A / dm

Electrolyte mixing or pumping of the cathode rod is recommended. Anodes copper M1 and M2.

In preparing the electrolyte, cobalt nitrite is dissolved in distilled water, then lactic acid is added with constant stirring and the reaction is carried out at 40-50 ° C for 20-30 minutes (until the release of brown gaseous products stops). Calculated amounts of copper sulfate and maleic acid, previously dissolved in separate portions of water, are introduced into the resulting solution. The solution is filtered and distilled to the desired volume. The electrolyte does not require study current,

The adhesion of the coatings is assessed by the scratch grid method and heat resistance at 180–200 ° C for 2 hours. No swelling or peeling is observed.

Elasticity is estimated on the instrument. The scale of flexibility SG-1, which is a set of steel rods of a certain diameter (20,15,10 5,3 and 1), strengthened; with a screw on the vertical axis. The SHG-1 device is used to determine the strength of bending coatings, i.e. the ability of the coating to not collapse (break and crack) and not lag behind when bending around a round rod of a certain diameter.

Samples of coatings applied on black sheet with a thickness of 0.2-0.3 mm, times Continuation of the table

Electrolyte performance

..

4 famous

Steel 65G Steel 3 Steel, 20

123 3

Uncoated

they are cut into strips of 10x2 cm and smoothly for 2-3 seconds, bend upward by 180 ° around a rod / 20 mm. If, after bending on the coating, when looking at a magnifying glass (with a fourfold magnification), there are no noticeable cracks and the coating does not peel off, then a strip around the bar of 15 mm, etc., will be bent elsewhere until the indicated changes are detected on the coating.

Flexibility is measured by the diameter of the last rod on which the coating remains intact. If the coating is cracked or peeled off when bent around the rod (/ 20 mm), the strip is evaluated as inflexible.

The purpose of the components in the proposed electrolyte is: sulfate copper CuSO - a donor of copper ions; maleic

BUT - O

C-CH-CH-c acid is improved

em gloss and alignment of deposited coatings, lactic acid O

sn-sn- - with

is introduced into

OH OH electrolyte composition to improve the structure of the coating (to reduce the rate of contact release of copper on low carbon steels); Cobalt nitrite Na, CO (CO) - complexing agent, provides the deposition of fine-crystalline coatings with high elasticity, as well as increases the stability of the electrolyte.

51236008ft

The technical and economic efficiency of obtaining the high quality of the proposed electrolyte of r-1 primer coatings on steel results in the intensification of process smallpox.

Editor L.Gratillo

Order 3067/28 Circulation 615 ipodpispoe

VNIIPI State Committee No. 1 of the USSR

for inventions and discoveries 113035, Moscow, Zh-35., Raushsk nab., d, 4/5

Production and printing company, Uzhgorod, ul, Proektna, 4

Claims (1)

COPPER COPPER ELECTROLYTE, containing copper sulfate, lactic acid and additional complexing agents, characterized in that, in order to increase the gloss and elasticity of coatings, reduce their roughness and intensify the process, but as additional complexing agents it contains maleic acid and sodium cobalt nitrite in the following ratio of components, g / l: Sulfur Copper 15-80 Lactic acid 80-225 Maleic acid 30-50 Cobalt nitrite sodium 15-45.