JPS59219490A - Bright tinned steel sheet with superior adhesion to paint - Google Patents

Abstract

PURPOSE:To obtain a bright tinned steel sheet with superior adhesion to paint by adding Ni ions to a tinning bath contg. an acidic brightener, electroplating a steel sheet in the bath by a restricted amount, and carrying out melt treatment. CONSTITUTION:A steel sheet is electroplated in a plating bath contg. about 5- 30g/l (expressed in terms of the acid content of sulfuric acid) acid such as sulfuric acid, about 5-80g/l stannous ions, about 0.1-30g/l brightener such as polyoxyethylene naphthol-sulfonic acid and about 0.1-50g/l Ni ions to obtain a steel sheet contg. about 0.3-9wt% Ni. The amount of the Sn-Ni alloy deposited is 0.1-2.5g/m<2>. The plated steel sheet is made bright by carrying out melt treatment to obtain a bright plated steel sheet. This steel sheet has improved corrosion resistance, rust resistance and adhesion to paint because Ni is contained.

Description

DETAILED DESCRIPTION OF THE INVENTION If a tin-plated steel sheet is left electroplated, the form of the surface oxide film will not be constant and the paint adhesion will be insufficient, so various surface treatments are performed. The present invention relates to a method for producing a bright electrolytic tin-plated steel sheet with excellent paint adhesion and shinsuke characteristics, which is plated with a specific amount of tin of a specific composition in a specific plating bath.

Can feathers need to be low cost, easy to process, have good gas permeability, corrosion resistance, and rust resistance, and are glossy and can be painted or printed before being used. The material must have excellent paint adhesion), and can materials are available for general cans, food cans, beverage cans, etc., and are widely used not only for long-term storage but also for instant use. Various materials have been used due to the development of materials such as mats, coatings, etc. The seaming method, soldering method, adhesion method, and welding method have been improved and used in can manufacturing, and there is a need for a method that is trouble-free during joining and seaming.

In this environment, tinplate is still one of the most popular materials because it has the above-mentioned properties. Just as coatings are moving towards using less solvent, tinplate is also at a stage where the amount of tin coating is being reduced.Tinplate, which has even better corrosion resistance, rust resistance, and paint adhesion, and is used for welded cans with a beautiful surface, Can stock is in demand.

There are several methods for tin plating, but electroplating in the 7-erostan method and halogen method generally involves pre-treatment.
The process is electroplating, flux treatment, melting, quenching, chemical treatment, and oiling. The glossiness of this surface is de-J
Although it is affected by pre-treatments such as JWS pickling, the important processes in high-speed plating lines are electroplating and flux treatment, which are influenced by the electroplating bath composition and flux agent composition. It is preferable that these materials can be stably manufactured through a series of regular operations, saving labor. In electroplating, plating is influenced by bath composition as well as current density, plating time, and temperature, which generally range from 5 to 200 A/blood 2.0.1
~10 seconds, in the range of room temperature to 95°C. The problem of sludge generation due to oxidation of tin is eliminated by removing plating, and the problem of tetravalent tin can be addressed by adding brightening additives or the like, or by detecting the atmosphere. The present invention relates to a method for manufacturing a tin-plated copper plate with excellent paint adhesion, which is manufactured under specific conditions in an electrolytic tin plating bath containing an acidic brightness additive, and includes considerations for the oxidation of tin in the bath. This involves consideration of the alloy layer and the amount of plating deposited.

The present invention uses one or more acids such as sulfuric acid, phenolsulfonic acid, benzenesulfonic acid, toluenesulfonic acid, hydrochloric acid, borofluoric acid, and hydrofluoric acid as a sulfuric acid content of 5 to 3
0 f/-/l and 5 to 80 Vt as stannous ions.
0.1 to 30 Vt of one or more of tephoryoxyethylene naphthol and tephoryoxyethylene naphthol as a brightening additive, and 0.1 to 50 F7/ as a nickel ion. Electroplating was performed using a plating bath containing 0.1 nickel salt to remove 0.1 nickel.
Contains 0.5 to 1 weight i% of 3 to 9 weight i%, and 0.1 to 2 weight i%
．． 5 V1712 (D) This is an attempt to provide a method for manufacturing a bright tin-plated copper plate with a high plating amount and excellent paint adhesion.Including nickel in the tin plating has good corrosion resistance, rust resistance, and paint adhesion. is improved.Plating amount is 2,
When the temperature is lower than 5, the effect on paint adhesion becomes noticeable. Furthermore, if the amount of nickel is too large, the tinplate gloss tends to be lost, while if the amount of nickel and plating is less than the above range, corrosion resistance and rust resistance cannot be obtained. The electrolytic tin-plated steel sheet produced by the present invention has no dull surface luster when electroplated as it is, and with the action of flux,
It exhibits corrosion resistance and gloss at the same time through heating melting and water quenching.

As the 7-six, tin phenolsulfonate is usually used. (Hot water may be used for quenching) Immersion methods and atomization methods are applicable. However, if the plating bath exhibits sufficient gloss, the flux treatment may be omitted.

5 containing nickel in the tin plating produced by the present invention
After quenching, the H-Ni plated copper plate may be subjected to a series of surface treatments, such as the known post-treatment with chromate, and in that case, the surface of the copper plate remains glossy and has excellent paint tightness. .

Example 1 Contains 30 f-/L of stannous ions as sulfuric acid, 10 Vt of nickel ions, 15 Vt as phenol sulfone sulfuric acid, and 5 Vt of polyoxyethylene α-naphtholsulfonic acid as a brightener. Take a bath,
Since the nickel content was tO-6%, tin plating was performed at a plating amount of 1 f/m'. This plated copper plate was electrically heated to 20°C, then melt-quenched by spraying water at 30°C and rapidly cooled to room temperature. 1. Perform local electrolysis treatment. After painting with Epoquin phenol paint of 55 my/blood 2, acid amide adhesive was applied and bonded under pressure, and a T-beer test was conducted, and the plated steel plate plated with the same amount of plating from a nickel-free bath showed O bond breaking strength K 2 .2 kf115;
Compared to ttrt, the chord wave of the steel plate of the present invention is 3.2 kg15
He was excellent at his friends. In this example, the surface of the tinplate before painting had a glossy tin plate, a stable ash release film, and good lambda rust resistance, and good adhesion to undercutting corrosion in a sodium chloride-citric acid solution after painting. Ta.

In addition, the amount of nickel in the plating bath is 0.6%, and the amount of plating is 5.
．． The T-beer test value of a test piece that had been tin-plated with 6 pieces and subjected to the same treatment was 1.3 kg and 15 mm.

As described above, when an appropriate amount of tin plating containing an appropriate amount of Nf is performed, the gloss after melt treatment is good and the adhesion is excellent.

Claims (1)

[Claims] Electroplating Sn-Ni containing 0.3 to 9% by weight of nickel to a plating amount of 0.1 to 2.5% using an acid electrolytic tin plating bath containing stannous ions, nickel ions, and brightening additives. A method for producing a bright tin-metal steel sheet with excellent paint adhesion, which comprises performing a melt treatment after the plating.