SU1154376A1 - Solution for chemical nickel-plating - Google Patents

Abstract

CHEMICAL NICKELING SOLUTION, injecting nickel salt, sodium hypophosphite as a reducing agent, sodium acetate in a ca. as a buffer and an organic additive, characterized in that, in order to improve the coating ability of the solution, it contains diazolin (3-methyl-9-benzyl-1,2,3,4-tetrahydrocarbolinonaphthalen-1, 5-dnsulphate) as an organic additive with the following ratio of components, g / l: Nickel salt 10-65 Sodium hypophosphite 10-60 Sodium acetate 5-40 Diazolin

Description

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This invention relates to the application of nickel coatings by chemical reduction from solutions.

A known aqueous solution lj for chemical nickel plating, including nickel salt, sodium hypophosphite as a reducing agent, and an additive to sodium nitrate and sodium acetate and ammonium sulfate in the following ratio of components, g / l:

1543762

(Z-methyl-9-benzyl-1,2,3,4-tetrahydrocarbolin-naphthalen-1, 5-disulfate) in the following ratio of components, g / l:

5 Nickel salt 10-65 Sodium hypophosphite 10-60 Sodium acetate 5-40 Diazolin 0.005-0.1 Diazolin has the following structural formula

30-50 (NH) 2SO 15-25 5-20 NaNO-j 7-14 CHjCOGNa 9-15 NaH 2P04

PriN 4.8-5.4 and 80-90 C deposition rate 1-1.5 µm / h. This solution can be used mainly for nickel plating of metals, the high temperature and low rate of nickel reduction make it practically unsuitable for metallization of plastics.

The closest to the invention in its technical essence and the effect achieved is a solution 2j for chemical nickel plating of plastics and dielectrics, including a nickel salt, sodium hypophosphite as a reducing agent, sodium acetyl as a buffer and an organic additive (maleic anhydride) as a stabilizing organic additive with the following content of components, g / l:

21 24 10

NiS04- CHj COONa

Maleic anhyd1, 5-2 reed

At pH 8-9 and 70-90 ° C, the nickel reduction rate is 32 µm / h.

However, the known solution does not have a good covering power which does not allow it to be used for the metallization of products with narrow gaps, for example, plastic waveguide channels.

The purpose of the invention is to improve the coating ability of the solution.

This goal is achieved by the fact that the solution for chemical nickel plating, including nickel salt, sodium hypophosphite as a reducing agent, sodium acetate as a buffer and an organic additive, contains diazoline as an organic additive.

and is known in medicine as an antiallergic agent.

To prepare a solution of the suspension (sulfate or chloride), sodium hypophosphite and sodium acetate, it is dissolved in small volumes of water and then poured together to bring the volume to the desired volume with water. Diazolin, which is highly soluble in an alkaline medium, is introduced into the finished solution as a powder.

The preparation of the plastic part and the metallization are carried out according to the following technological scheme: degreasing with dental powder, hot degreasing in a solution containing:

Trisodium phosphate 20 g Soda ash 20 g Detergent Progress 10 ml Water up to 1 l at 50-60 C for 10 min washing, etching in chromium salts for 6-8 min washing, activating in a combined activation solution, containing

Palladium chloride 1 g Tin dichloride 45 g Acid salt per 120 ml Potassium chloride 180 g Vodado 1 l

at room temperature for 5 minutes; washing, treatment in sodium hypophosphite solution 30 g / l for 2 minutes; washing, acceleration in a solution of 2% sodium hydroxide for 2 minutes; chemical nickel plating, washing, drying. The proposed solution allows to metallize plastic parts of a complex configuration, in the hour of the bone, the internal slit of waveguides with a section of O, SKI, 2 mm or 1.2x1.8 mm and a length of 50 mm, made of copolymer AG-4. The reduced nickel is bright, semi-bright, the chorus is coupled with plastic. The table presents the comparative data of the proposed and known solutions. Waveguides made of plastic AG-4 with a section of 0.8x1.2 mm and 1.2x1.8 mm, length 50 mm, prepared using the described 76 technique, are subjected to nickel plating. Nickel plating is made from various compositions indicated in the table. The quality of the coating is evaluated by the degree of channel penetrability. As can be seen from the table, the use of the proposed solution allows to achieve full clogging of the slits. The solution is functional even at low temperatures (40-70 ° C), while its stability is increased, but the rate of nickel coating deposition decreases. The economic effect can be obtained by improving the quality of the sludge during the transition from metallic: to nickel-plated plastic parts.

Claims (1)

CHEMICAL NICKELING SOLUTION, including nickel salt, sodium hypophosphite as a reducing agent, sodium acetate in ca-. the quality of the buffer and an organic additive, characterized in that, in order to improve the hiding power of the solution, it contains diazoline (3-methyl-9-benzyl-1,2,3,4-tetrahydrocarin bolinonaphthalene-1 as an organic additive) 5-disulfate) in the following ratio of components, g / l: Nickel salt 10-65 Hypophosphite nat- ria 10-60 Sodium acetate Diazolin (3-methyl-9-benzyl- 5-40 -1,2,3,4-tetra- from hydrocarbolinonaphthalene-1,5- | // h disulfate) 0.005-0.1 g i I (3-methyl-9-benzyl-1,2,3,4-tetrahydrocarbolinonaphthalene-1,5-disulfate) in the following ratio, g / l: Nickel Salt 10-65 Sodium hypophosphite 10-60 Sodium Acetate 5-40 Diazolin 0.005-0.1 Diazolin has the following structural ‘formula