DE1259169B - Bath for galvanic deposition of mirror-glossy, leveled and homogeneous nickel coatings - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Int. Cl .:

C23b

GERMAN

PATENT OFFICE

EDITORIAL

German KL: 48 a-S / 08

Number:
File number:
Registration date:
Display day:

1259 169
R28870VIb / 48a
October 10, 1960
January 18, 1968

For galvanic deposition of mirror-shining, leveled and homogeneous nickel coatings are Baths with a content of a basic gloss known that optionally a wetting agent and May contain N-substitution products of pyridinium.

Development has shown that the construction principle can be varied in a certain way, with Depending on the special structure of the compounds, there is a certain range of variation in individual properties of the Electrolytes and precipitates are observed. This makes it possible to oppose the already results described still further improvements in terms of gloss, leveling and To achieve homogeneity of the precipitation.

It also shows that the structure types could be expanded in different directions, which also gave excellent results.

Particularly homogeneous nickel deposits can be obtained when the on the nitrogen of the heterocycle is exploiting Dende substituent groups with I ¹ / 2- to 2 times contains bonds, is chain-branched weak, whereby the chain of at least 6 atoms.

Nl- (2-oxo-n-octyl) pyridinium chloride,
Nl- (n-octenyl-2) pyridinium chloride.

Highly effective leveling substances arise when the number of groups with IV2- bis Double bonds and / or the number of heterocycles in the molecule is increased. It can be here bonds with a character of up to 3 also occur, also ionogenic groups:

N-l-Cyclohexadienyl-pyridinium chloride,

N-l-Cyclopentadienyl-pyridinium chloride,

N-2-malonyl-pyridinium chloride,

N-4- (3,5-Dioxo-n-heptyl) -pyridinium chloride,

N-carboxy-sulfo-methyl-pyridinium chloride,

N-4- (3-oxo-octenyl-5) pyridinium chloride,

N-4- (heptadiinyl-2,5) -pyridinium chloride,

N, N'-1,3-propyl-2-oxo-bis (pyridinium chloride).

The substances are used in combination with basic glosses known per se. As a wetting agent Sulphation products of higher alcohols are suitable.

Electroplating bath
more mirror-like, more leveled and more homogeneous
Nickel coatings

Applicant:

Riedel & Co.,

4800 Bielefeld, Wiesenstr. 23

Named as inventor:
Dipl.-Chem. Dr. Mario Käppel,
8906 Gersthofen

example 1

240 to 320 g / l nickel sulphate,
20 to 60 g / l nickel chloride,

0.05 to 0.15 g / l N-l- (2-Oxo-n-octyl) -pyridinium-

chloride,

0.1 to 4 g / l saccharin,
0.1 to 1 g / l fatty alcohol sulfate.

Example 2

240 to 320 g / l nickel sulphate,
20 to 60 g / l nickel chloride,
20 to 40 g / l boric acid,
0.02 to 0.15 g / l N-Cyclopentadienyl-pyridinium-

chloride,

0.1 to 4 g / l saccharin,
0.1 to 4 g / l fatty alcohol sulfate.

Electrolytes of the specified composition produce high-gloss, leveled and homogeneous nickel deposits in a pH range from 2 to 5, at 40 to 70 ° C. and at current densities of up to 10 A / dm ^2.

Claims (2)

Patent claims: 1. Bath for the galvanic deposition of mirror-shining, leveled and homogeneous nickel coatings with a content of a basic gloss, optionally a wetting agent and N-substitution products of pyridinium, d a - 709 719/362 characterized in that there are N-substitution products of pyridinium of the general formula N LrJ he or Ν —Α —Ν CI " QY nyl-2), 2-malonyl, 4- (3,5-dioxo-n-heptyl), 1 - carboxy -1 - sulfonic acid - methyl, 4 - (3 - oxooctenyl-5) or 4- (heptadiynyl-2,5) and A is the group 1,3-propyl-2-oxo. 2. Bath according to claim 1, characterized in that it is the N-substitution products in in an amount of 0.02 to 0.5 g / l. contains, where R is the grouping cyclohexadienyl, cyclopentadienyl, (2-oxo-n-octyl), (n-octe-Considered publications:
German Patent No. 939 662;
German interpretative document No. 1 106 139;
U.S. Patent Nos. 2,782,153, 2,658,867.