JPS5950190A - Nickel-phosphorus alloy electroplating bath - Google Patents

Abstract

PURPOSE:To obtain the titled plating bath giving a film having high corrosion resistance and a specular surface with high electrodeposition efficiency by using specified amounts of nickel sulfamate, boric acid, phosphorus acid, phosphoric acid, EDTA and sodium laurylsulfate as essential components. CONSTITUTION:This Ni-P alloy electroplating bath contains 100-700g/l nickel sulfamate, 0'45g/l nickel chloride, 15-50g/l boric acid, 5-100g/l phosphorus acid, 5-100g/l phosphoric acid, 10-100g/l EDTA and 0.01-0.5g/l sodium laurylsulfate. Nickel chloride is used to dissolve an Ni anode, so it is not necessarily required when no Ni anode is used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic nickel-phosphorus alloy mesolithic bath which has high tetrahydric properties, high-speed electrodeposition properties, and produces a mirror-like coating.

Conventional '+lI nickel phosphorus alloy metals have a low phosphorus content, which limits their use in fields where corrosion resistance is particularly required. This is because the precipitation rate becomes very slow if the phosphorus content is increased, and the phosphorus content limit is 14 to 15 qA.
Therefore, the phosphorus content of the precipitate is generally 12% or less. NU, 91-year-old trees with poor appearance appear in winter, are unsuitable for Takasaki ornaments, and are caused by hydrogen generation in 1r47. Its purpose is to improve nickel-phosphorus alloy plating to obtain an IV film with high corrosion resistance, high electrodepositivity, and a flat surface.

Note that sulfamic acid di-I, which has a high solubility, was used as the nickel ion used to supply nickel in the water bath. The concentration is 100-700 g/l, p+tri, 500-500 a/l. The 100 g/l DJ 'T- pigeon house used nickel chloride of θ~45σ/l to reduce the snow accretion rate and to improve the melting angle of the nickel anode, which requires high current density addition. If a nickel body plate is used, if A is used, it must be 1 ゛ must be ip'. As the p n 11 qli agent, boric acid was used at 15 to 5 oσ/l. H4 Yashikake 40~5
At 0 g/l, the blackening of the nickel phosphorus film turned toward whitening. Boric acid 50 a/l d precipitation occurs in the marginal soil.

As a source of phosphorous acid, use 30-10 ng/l of phosphorous acid, preferably 40-70 ng/l. 7/l It is possible to stably obtain a phosphorus content of 16 or more in the film.
ftp, qlKEDTA j O ~ 100 g/
l Desirably, 140 to 60σ/l was added.Due to busyness, the bit size decreased significantly and a cloud-free sloped gloss was obtained.If added above 100 q7't bl, the bath becomes unstable and precipitation occurs. There is. Nu,
Sodium lauryl sulfate 0 as a pitting preventive agent,
01~0.5 (t/l added. Desirably, 01~0.5
The phosphorus content can be increased by adding 5 to 1 ooq/l of phosphoric acid, which is not suitable for the purpose because the addition of 05071 or more causes too much foaming.

Desirably it is 30-60 g/l f. 1006
If the value is 71 or more, the acidity is too strong and will damage the plated item, and the +ft bit will also increase.

Example 1 A time-opening case made of Singyu (Ill K, subjected to pretreatment such as degreasing, and containing nickel sulfamate 450 g/
l Nickel chloride 30σ/l, polyacid 45σ/l, phosphorous lp 4 q/l, phosphorus R40a
/l, F! I) TAROry//.

I went to a nickel phosphorus alloy plating bath containing 0.1 f7/l of sodium chloride and PJ (0.8, bath 6
o℃? T! Soup, density 6 A/drn2. Plating was performed at 4 μm in 10 minutes using a rotary stirrer. I washed it with water using the specified method and it was about 0.15μ? N's rhodium meggi. Normally, electrochemical corrosion occurs in the case of Nickel Meggi 10 rhodium plating, resulting in corrosion resistance K II! When there is an IG, a palladium-like plating is applied between the nickel and rhodium membranes. Even with nickel-phosphorus joint plating with a phosphorus content of 13 or less, satisfactory data cannot be obtained in corrosion resistance tests using direct rhodium plating and artificial sweat.

In the case of plating according to this method, the phosphorus content is 15eI)
As described above, it was superior to the one using palladium in the corrosion resistance test using artificial sweat. Matahit,
Plating abnormalities such as spiders are also minimized ((It is possible to obtain a very mirror-like surface, and with such a high phosphorus content, 41°'m/10
I also get the value of minutes. Bending test μ, (I made the eave side of the tze 1 by T: This was also 100%, and I was sorry for the light size of the 7.2 eyes, white plating λ. It had a very luxurious feel.

Example 2 A clear ff1H1 supply row part (material: carbon layer) was degreased and subjected to Mtp and JITI, and then treated with nickel sulfamate 400 rt/l and boric acid 45σ/1. '#
r phosphoric acid 50 g/l phosphoric acid 50 g/1. , F,
DTA40 g/l, sodium lauryl nitrate A 0.2
Oite in a nickel phosphorus alloy plating bath consisting of q/l.
PH0,781FAI'f65℃TFt flow density o2A/
dm 2.Franille plating is performed using rotary stirring for 1 minute.When conventional nickel plating is applied to carbon steel, there was a problem with corrosion resistance, but the present nickel phosphorus coating (
When tested using artificial sweat with a phosphorus content of 17%, the corrosion resistance was approximately 5 times higher than that of conventional products.

It was also found that the width of the kana is also the same as in the case of nickel film.

As an example plating bath version 1, nickel sulfamate 350
(1/l, 1λ4 di-soul 30σ/l boric acid 4
5σ/l, phosphorous acid 50 q/), phosphorus p 4' Ot
y/l, lauryl hangover putri ram O,n 5 (
1/1. , ET'lT A 2047/). Xn A5℃, current density rif28/d? ? +2
Plating was carried out for 10 minutes and with one strip of a yellow plate serving as a cathode, to obtain a coating having a thickness of 10 μV and a glossy surface.

Phosphorus content in the film Vi+6. ! Corrosion resistance due to artificial sweat, chemical resistance due to nitric acid, and adhesion during bending tests were confirmed.

Example 4 Nickel sulfamate 450 n/l, tD nickel 30 q/l, nickel sulfamate 45 g/l
, ! Ili phosphate 40 q/l.

lj:/nt 4 o g/l, br+TA30
g/l, sodium lauryl FF 0.1
A nickel phosphorus alloy bath consisting of 0/l (pno, 8) K nickel plate and solid rod, a Fi copper watch case placed as a relief, bath temperature 6 o'c lightning current density 4 A/d? ? Box coating was performed on the n1 case for 10 minutes under +2 sales. The plate was plated with 3 μl of gold using a conventional method. It has a beautiful shine on the surface, reduces the brightness of the streaks by 1°, and has a luxurious feel.

Corrosion resistance is also 4 to 5 when using nickel (7: ShunjukojuL f., 2nd time nickel) 1. Thickness of IJ alloy film U2μ? At n (I ↑ the adhesion was 1., -I ta, hedo) tl. Kaise 11, blood 1
Fields that desire chemical properties, liability if / Tsuki's subscripts request a film for use! l! F (example decoration)
11 (item) Bamboo can be used for a wide range of purposes, and in practical terms, it is suitable for I1.
It is an invention.

Jy1shi Applicant Stock money side Shobo Seikosha Fushirito Patent Attorney Mogami 445-

Claims (1)

[Claims] In an electrolytic nickel phosphorus alloy plating bath, nickel sulfamate 100-7 (IQ g/), nickel chloride 0
~45 g/l, boric acid 15-50 g/l, phosphorous acid 5
~ion g/l, phosphoric acid 5-100 g/1.
, EDTA 10 to 100 a/l, and sodium lauryl sulfate 0.01 to 0.5 (t/l).