SU827612A1 - Method of decorative nickel-plating - Google Patents

Description

The invention relates to the electrolytic deposition of electroplated coatings, in particular to electrolytic nickel plating in order to obtain a decorative nickel coating of black color.

A method of producing black nickel coatings from chloride electrolyte containing nickel, ammonium and zinc chlorides and sodium rhodanide is known at a cathode current density of 0.1–0.75 A / dm ² , which involves the preliminary deposition of an underlayer of another metal, for example, nickel, copper, silver, cobalt, etc. . ,[one].

The closest to the invention to the technical essence is the method of decorative nickel plating, including the sequential deposition of brilliant and black nickel from electrolyte sulphate, containing as additives, which give a black color to the coating, zinc sulfate and ammonium or potassium rhodanide. Black nickel is precipitated at a current density of 0.1 A / dm ² for 20–30 min [2].

A disadvantage of the known methods is a change in the color of the coating over time, its relatively low adhesion and strength, which requires additional operations to harden the coating, for example, applying additional lacquer

2

films, passivation, oiling, etc.

The proposed method is different from that known for the fact that the precipitation of black NP is carried out in sulfate electrolyte. containing, Mr.

Nickel sulfate 250-300

Nickel chloride 50-60

Boric acid 25–35

Yu Potassium Rodanist 15-30

Saccharin 0.5-1.2

1.4-butdinnol

(35% solution) 1.5-1.75

at 50--60 ^with С and cathode current density

15 1.0-1.5 A / dm ^{1 2} for 0.5-1 min.

This difference leads to the obtaining of decorative coatings in color under “antique silver”, which do not change colors for a long time and are distinguished by good adhesion with the base and

sufficient strength.

The method is as follows.

First, an electrochemical 25 degreased parts in a solution containing, g / l:

Sodium hydroxide 20–25

Soda Ash 25-30

Thrinatrice 25–30

sn Liquid glass 5-7

at ί temperatu re 6 (1 75 'С, p.chotnstn current ;!

5 — K) Λ / dm–, for 5–8 minutes, after which the parts are washed in hot and cold water for 30–50 eq.

Then the details are poisoned in a solution of the following composition containing, SL:

Sulfuric Acid LLC — 700

Lzltashya acid LLC D35S>

Hydrochloric acid (5--20

and for 1 min.

Then again washed in cold water for 30 to 40 eek.

After hlyuyao parts other than the electrolyte of the following composition, containing,

ten

I (chaos

Pappu

Ы1Н.

Carry ι back? ps

Ηϋί'ί) POITSHTPS

! gost ppch? ? method!

Κοϋϊμυ.ιπ n (П1-;; СП! СИСП.ССППЫ ЯППОП С С СС (Л

. * 11 (GOS /! '

! 0875-71, mete

С С: КП ДСрСПСП 1

: I Ssipn1p: in the form of PS nsblyudk- '

') |' From 4,4,141BNP

PPkelv sulfate 2, e0 300

Two-lined pp-3 (4 - () 0

Boric acid 25 ....... 35

Saccharin nshiegyuy

1.4 bmtkndpol (35% -n "H

2 --- 5 AsthS. holding time Note ρ. 11a details and; bluish decorative silver nickel iodine. According to the product n application divided

nickel in accordance with the stated! A black nankelg was applied to the products, w of electrodes of the following composition.

0.5-1.2 55 1.75 2 and ACCESSORIES 11 d n rp sun 20 dshi ds l'oop; TPVP'CH brass ιΐίίΐκ'- · 25 chenpoi in eo-d IU coating train dt! l pdv le gn) dtoton to u wil l с ι В: \ () С and b, she is craving until now NOY I

NDPeN

And I p

thirty

I GL I A! (> Τ ι ('η, "

F i

(LIH '() b LS

!P

Edektro.Ίΐιτ for the deposition of "black non-pome;)

for. " g / 'd 12 one five Nickel is gray about and with. you ·> 250 300 Nickel chloride 50 55 00 Boric acid 25 thirty 35 Saccharin food 0.5 0.85 1.2 1.4 Bootshnol (35Y- 1.5 1,525 1.7 ny) Potassium Rodanist 15 22.5 thirty Current density A / DHG 1.0 1.25 1.5 Temperature. 'WITH 50 55 00 Wanted Yann Time 0.5 0.75 WITH

The resulting coatings were tested for adhesion by applying a scratch mesh, corrosion resistance but a change in appearance and color resistance. For comparison, coatings obtained in a known manner were tested.

The results are shown in the table.

vkd yuch channel; ZZ ι smolders I am G'o and Th;

bona eleugrodkta. about '! l and h and to? yi what There is also an elevated zeta effect on the coating adhesion. drive precipitated from the electroliga. 40th, GTA;

ί I and Kel ι, sulfur sulfur 5 11 n kel g, x, t rnsty; Mr. Sorbitan Potassium Rodanist-C Saccharin

(. (-button. t (35C-th racer) at 50 - 00C '. n cathode sludge 1.0 1.5

50 Sources of information

taken into account

1. The patent of Germany, D 1063970.

5 08, 1958.

2. Yampolsky Λ. AT, Medneg

3.3 ke.tprovappe. ηΑΓιηιπηοκτ dew;

E. 73 71.

ίPKI'VΊ!>; D 1> NICKEL

<desh

knock

Claims (1)

shay and toteshk ; 5y1-3 (.70>)> ( With ZY t5 3 ( 5 1C l; current 48 Compiled by L. Kazakova Editor E. Bratchikova Tehred I. Zabolotnova Proofreaders E. Osipova a. O. Siluyanova Order 3000 11th ed. Се 288 Тара ж ί 2 ΒΙΙ1ΙΙΙΠ11 Göudare edema s who, in the USSR, according to the ideas of inventions and discoveries Zagorskaya printing house Uprvoligrafg 'U