JPS62116795A - Production of nickel plated material - Google Patents

Abstract

PURPOSE:To produce a nickel plated material having good gloss and excellent workability by subjecting a rolling material of an austenitic stainless steel to semi-bright or bright nickel plating then to bright annealing or vacuum annealing. CONSTITUTION:The rolling material of the austenitic stainless steel having the recrystallized structure obtd. by heating to the recrystallization temp. of above and having the excellent workability is subjected to semi-bright or bright nickel plating by the conventional method. The rolling material subjected to such nickel plating is subjected to bright annealing or vacuum annealing. The bright annealing is executed in an inert gas such as the cracked gas of NH3 and the vacuum annealing is executed preferably in about >=10<-2>Torr vacuum. The nickel plating film having the good brightness and excellent workability is thus obtd. even with thin plating of about 1mum.

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective) The present invention relates to a method for producing a nickel-plated material in which semi-bright nickel plating or bright nickel plating with good gloss and workability is applied to austenitic stainless steel.

(Prior art) Stainless steel itself is highly corrosion resistant, so there is almost no need to plate it to improve its corrosion resistance.
Plating may be applied to improve contact resistance or to improve contact resistance.

Examples include lithium battery cases and solar cell substrates. Lithium battery cases are required to have excellent additive properties, and are required to have no cracks or rough skin when subjected to deep drawing, low contact resistance, gloss, and an excellent appearance. There is. In addition, solar cell substrates are required to have excellent surface smoothness and gloss, and to be free from minute defects, pits, and the like. For this reason, it has been proposed to apply nickel plating to the cases of lithium batteries and substrates of solar cells as described above. On the other hand, considering the application of nickel plating, nickel crystals deposited in semi-bright or bright nickel plating generally have a fine, layered structure, unlike crystals deposited from a matte bath that does not contain brighteners. Smoothness and hardness.

Physical properties such as elongation and internal stress are also different. The refinement of crystals in semi-bright or bright nickel plating is thought to be due to adsorption of the brightener to the surface of the product (cathode), reduction of the brightener itself, or further decomposition or eutectoid. Primary and secondary brighteners are usually used as brighteners that play such a role, and are called semi-bright nickel plating or bright nickel plating depending on the amount of these added. Primary brighteners include saccharin, sulfonebenzaldehyde, and naphthalene sulfonate.

Aryl sulfonates, aliphatic and aromatic fatty acids.

Sulfonamides, sulfonimides, etc. are used. In addition, as a secondary brightener, propargyl alcohol and 1.4
- Condensation products of acetylene alcohols and diols such as butyne diol with ethylene oxide and epichlorohydrin, quaternary salts containing heterocyclic nitrogen, especially sulfates, etc. are used.

To apply semi-bright nickel plating or bright nickel plating on stainless steel, the surface of the stainless steel is generally degreased using a known method.

After pickling treatment, activated strike nickel plating is performed using a Wood bath, and further plating is performed using a semi-bright nickel plating bath or a bright nickel plating bath to which appropriate amounts of the primary brightener and secondary brightener are added. There is a way.

As mentioned above, general nickel plating can be applied, but in reality, it is not possible to obtain a nickel plating film with good gloss on austenitic stainless steel, which has a recrystallized structure with excellent workability.

Therefore, a method is used in which after plating a thick layer of expensive nickel using the above method, the nickel surface is polished to obtain a shiny surface.

(Structure of the Invention) The present invention has been made as a result of intensive research in view of the current situation, and has discovered a method for obtaining a nickel plating film that has good gloss and is highly workable even with a thinning of about 1 μm.

That is, the present invention relates to a method for producing a nickel-plated material, which comprises applying semi-bright nickel plating or bright nickel plating to a rolled austenitic stainless steel material and then bright annealing or vacuum annealing.

Bright annealing refers to annealing performed in an inert gas, and the inert gas is NH, decomposition gas,
GaX (H, near 5%, N: 25%.

(dew point -40 to -60°C) or pure H2 is used.

Further, vacuum annealing refers to annealing in a vacuum of 10''2 Torr or more, preferably a high vacuum of 10'' Torr or more.

Note that the recrystallized structure is a structure obtained by heating stainless steel above the recrystallization temperature, and can be applied regardless of the size of crystal grains. In addition, austenitic stainless steel is a stainless steel that usually has a stable austenitic structure, and contains Fe and C.

PHSHs8. containing appropriate amounts of Ni, Cr, Mn, N, etc., depending on other characteristics. Txg Nbg TarMo,
It contains stainless steel to which Cu is appropriately added.

The present invention will be explained below based on Examples.

(Example) A SUS304 cold rolled steel plate (0.25 nynt) was degreased and pickled by normal pretreatment, and then struck nickel plated in a wood bath under the plating conditions shown below.
Thereafter, 1 micron of semi-bright nickel plating and bright nickel plating were applied to obtain a nickel-plated surface with a beautiful surface.

The plating conditions are as shown below.

Strike nickel conditions Nickel chloride 250 g/Q salt
Acid 100 g/Q current density 5
A/d semi-bright nickel plating conditions Nickel sulfate 280 g/Q Nickel chloride 50 g/Q oxic acid
4 5 g / Q Naica P
C-330g/Q (manufactured by Japan Ronal) Bath temperature 50-60℃ Current density
2~8A/drI? Bright nickel plating conditions Nickel sulfate 280 g/Q Nickel chloride 50 g/Q oxic acid
45g/QY nickel RH-11mQ/Q (made by wide-mouth metal brating) Y nickel R) I-210+nQ/Q (wide-mouth metal brating H) Bath temperature 50-60℃ Current density
After bright annealing in a hydrogen atmosphere at 2 to 8 A/d, the Ni-plated surface maintained a beautiful surface and 5US304 was recrystallized.

The glossiness of the nickel plated surface was measured using a 30' specular reflectance.
Further, workability was evaluated by 180° bending.

Further, as a comparison material, when 5US304 bright annealed material was similarly coated with 1 μm of semi-bright nickel plating and bright nickel plating shown below, the surface of the nickel plating was cloudy. Further, after performing puff polishing on 5US304 bright annealed material, a beautiful surface was obtained by applying 1 μm of semi-bright nickel plating and bright nickel plating, but cracks were observed in the bent portion when bending 180°.

The above results are summarized in Table 1.

Table 1 Evaluation results O...Good X: Cracks or cracks are observed.

(Effects) As described above, according to the method of the present invention, a nickel-plated austenitic stainless steel material having excellent gloss and workability even with thin nickel plating can be obtained.

Claims (1)

[Claims] A method for producing a nickel-plated material, which comprises applying semi-bright nickel plating or bright nickel plating to a rolled austenitic stainless steel material and then bright annealing or vacuum annealing.