JPS5974291A - Bath for glossy nickel-iron alloy electrolytic deposition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the electrodeposition of bright nickel-iron alloy deposits containing up to 30% iron. This electrodeposition is used in electronics, urinary stones, military and household goods, medical applications,
It can be used in place of bright nickel plating in the fields of sporting goods, bicycle parts, motorcycle parts and automobile parts.

Known cancer additives for bright nickel-iron alloy plating mainly include three compounds: brighteners, complexing agents, and anti-pitting agents.

As main brighteners, saccharin, sulfobenzaldehydes, naphthalene trisulfonates, arylsulfonates, aliphatic and aromatic fatty acids, sulfonamides, sulfonimides can be used.

As a secondary brightener, glono-4 rugyl alcohol or 1-
．． The condensation of acetylene alcohols and diols, such as 4-7" tin diol, with oxidized esters and epichlorohydrin include quaternary salts containing heterocyclic nitrogen, especially tylphates. Secondary brighteners used for this purpose There are also polyamines with a molecular weight of 300 to 24,000 and sulfonated polyamines.

Known baths for the electrodeposition of bright nickel-iron coatings can produce high quality alloy deposits, but the usual anti-pitting agents used for bright nickel plating? Contains. Although anti-bit agents prevent pit formation, they do not improve other properties of the coating and are unsuitable for alloy plating processes.

According to the present invention, it can coexist with brighteners and stabilizers, has an anti-bit effect that improves the leveling force of the electrolyte and the ductility of the coating, does not affect the current efficiency of the bath, and does not affect the internal A bath is provided for the electrodeposition of bright nickel-iron alloy coatings containing all additives that do not degrade other properties such as stress and gloss.

The bath used in the plating operation of the present invention includes nickel sulfate,
Contains nickel chloride, ferrous sulfate, boric acid, sodium citrate, sodium gluconate, saccharin, hydroxylated butene-diol, and as an additive hydroxymethylated n7t with the following repeating units:
Contains oligoamide.

((CH,)nNCO(CH,)pNCO)m1CCH,OHC)(,CH20H (where n$> and p are 3 to 12, n
kill, and m is 4-45. ) The terminal groups of this substance are -NH, and -C00H, and the concentration of this substance is 0. Engineering~L5i/l! There is ``'C.

As a result of the combination of said additives with common ingredients such as saccharin, salts of oxycarboxylic acids and salts of hydroxylated butene-diols, they contain up to 30% iron and exhibit high copper corrosivity, resulting in bits Free of formations and other defects,
A soft, malleable nickel-iron alloy coating with longitudinal gloss and levelness is obtained. The additive increases the leveling power of the electrolyte and the malleability of the deposit by about 7-10%.

The invention can be better understood by reference to the following examples.

Example 1 A bright nickel-iron alloy coating was deposited from a bath containing the following materials: NFC.

Nickel sulfate 100g/l Nickel chloride 70 Jil/l Ferrous sulfate
10 g/1 boric acid
451! /13 Sodium citrate
2517/73 Satukarin 4
g/l hydroxyethylated butene-diol
0.21i/1 hydroxyethylated oligoamide
0.1171 (n=p=6 - m=16) Bath temperature is 60℃, pH is 3.3, cathode flow rate is 3~
7. ni/dm”, bubbling due to the irritating energy.
Ta.

The deposits obtained had a specular luster with low internal stress, high malleability and high leveling properties.Example 2 A nickel-iron mixture was poured from a bath containing: The coating was electrodeposited.

Nickel sulfate 1pOg/A'Nickel chloride '1011/73 Sulfuric acid No. 1
1o/i/1 boric acid
4sp/1 sodium citrate 12
．． 51! /1 Sodium glyconate 12
．． 51//1 Satukarin 4
．． 0g/l hydroxyethylated butenobutenol
0.2jj/1 hydroxyethylated orideamide c), 129/1 (n=p=6 0
m=20) The condition of the plating was the same as in Example 1 except that the leveling was higher than that of the Example 1 coating.

Example The protective decorative coating of nickel-yellow alloy had the following composition.

Nickel sulfate 113.29/l Nickel chloride 117.2 g/l Ferrous sulfate
4.5g/l boric acid
so, og/J sodium citrate to
, og/V sodium glyconate to, o
g/J saccharin 4. og/l hydroxyethylated butene-diol o, 4:i
/1 hydroxyethylated oligo7mide 0
．． 25 fl, / 1 (n = 4, p = = (i, m =
30) Bath temperature r1.55°C, pH=3.5, current density iA/dm', and negative stirring was performed.

The obtained coating was soft and had the following characteristics:1. % malleability and specular gloss, and had a higher uniformity of 11% than the coatings of Examples 1 and 2.

+11゜;;ri person-j”'a ”r', jl, j(
-flr, Sat: Rei [TakehikoContinued from page 10 Inventor Georgi Mitev Raichevsky 63 Sofia Petchuy Street, Bulgaria 0 Inventor Stefan Atanasov Armyanov Sofia Bowl, Bulgaria Bitsha 19 0 Inventor Ivan Mladenov Todorov, 9 Sofia Chabaev Street, Bulgaria @ Inventor Stefan Rushkov Stefanov 11 Sofia K. Veskova Street, Bulgaria 0 Inventor Margarita Nikolova Chomakova Bulgaria sophia boul lenin 4

Claims (1)

[Scope of Claims] A bright nickel-iron alloy electrodeposition bath containing nickel sulfate, nickel chloride, ferrous sulfate, boric acid, sodium citrate, sodium gluconate, saccharin and hydroxylated butene-diol, comprising: An anti-pitting agent which is a hydroquine-ethylated oligoamide having the following repeating single strands and further contains 0.1 to 1.5 Ji/A' gold. CH, CH, OHCH, CH, OH (wherein n=p or n~p and rarely n and p are 3~1
2, m = 4-45, and the terminal group is -NH2
and -COOH. )