JPH10237684A - Iron electroplating liquid and high tensile iron plating film obtained by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an iron electroplating liquid capable of yielding plating films having the tensile force higher than the tensile force of the conventional plating films by incorporating a specific ratio of >=1 kinds among water-soluble polyoxyethylene derivatives into the iron plating liquid consisting essentially of ferrous chloride. SOLUTION: The ferrous chloride is used as an essential component and further, calcium chloride, manganese chloride, saccharin which is a stress relieving agent, etc., are added thereto, by which the iron electroplating liquid capable of yielding the plating films having high ductility and tensile force of about 30kg/mm<2> is obtd. at high plating speed. One ore more kinds of the water-soluble polyoxyethylene derivatives are incorporated into this conventional plating liquid at 0.05 to 2.5 millimol per mol of the ferrous chloride. The water-soluble polyoxyethylene derivatives consisting essentially of either of polyoxyethylene alkylamine and polyoxyethylene alkylether are preferable as the water-soluble polyoxyethylene derivatives. The plating films having the tensile strength of about >=40kg/mm<2> and good appearance are obtd. by using such iron electroplating liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron plating film exhibiting high tensile strength and an electric iron plating solution obtained therefrom.

[0002]

2. Description of the Related Art Electric iron plating is used for various types of electroforming, repair overlaying of steel parts, production of iron foils, etc. In addition, when preventing the tip of a soldering iron from eroding, when hot dip galvanizing a silicon steel sheet. It is widely used for the purpose of protecting materials.

Conventionally, some electric iron plating solutions mainly contain chloride, sulfate, boron fluoride, a sulfate / chloride mixture, and sulfamate. Each of these plating solutions has advantages and disadvantages, and a plating solution mainly containing chloride as a main component is often used from the viewpoints of plating speed, ductility of a plating film to be obtained, and the like.

[0004] The plating solution mainly containing chloride is ferrous chloride or a mixture of calcium chloride and manganese chloride added thereto, and has a feature that the iron content can be increased.
Plating can be obtained at a temperature of 85 ° C. or higher and a pH of 2.1 or lower.

[0005]

However, the electric iron plating film obtained by the above method has a tensile strength of 30 kg / m.
mm ² , and the iron foil obtained by using this plating solution has low mechanical strength, so that it is difficult to obtain a good electronic component by using the iron foil.

[0006] An object of the present invention is to provide an electric iron plating solution capable of obtaining a plating film having higher tensile strength than conventional plating films.

[0007]

Means for Solving the Problems The present inventor has made ferrous chloride a main component of an electric iron plating solution and added a trace amount of a water-soluble polyoxyethylene derivative to reduce the tensile strength of a film obtained from this plating solution. The inventors have found that the present invention can be improved, and have reached the present invention.

[0008] That is, the electric iron plating solution of the present invention for solving the above-mentioned problems is obtained by adding a water-soluble polyoxyethylene alkylamine or polyoxyethylene alkyl ether to an iron plating solution containing ferrous chloride as a main component. One or more polyoxyethylene derivatives are contained in an amount of 0.05 to 2.5 mmol per 1 mol of ferrous chloride.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION It is considered that by adding a small amount of a water-soluble polyoxyethylene derivative to an electric iron plating solution, a small amount of carbon is contained in the obtained electric iron plating film. Thereby, it is considered that the crystal structure in the electric iron plating film becomes stronger and the tensile strength increases. Examples of water-soluble polyoxyethylene derivatives include polyoxyethylene alkylamines such as polyoxyethylene dodecylamine and polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether. Is commercially available as an antistatic agent, an emulsifying dispersant, and a fiber agent.
Amit 105 and Emulgen A-5
00 ".

The amount of the polyoxyethylene derivative to be added is at least 0.05 mmol per 1 mol of ferrous chloride present in the bath. Below this, the tensile strength of the resulting iron plating film cannot be increased, and the appearance of the resulting plating film deteriorates. Further, the above polyoxyethylene derivative is added to 1 mol of ferrous chloride in an amount of 2.
If it is added in excess of 5 mmol, it becomes a brittle film, which makes it difficult to handle as an electronic component.

When such an iron plating solution of the present invention is used, the resulting coating has a tensile strength of 40 kg / mm ² .

[0012]

Next, the present invention will be further described with reference to examples.

Example 1 A rolled copper plate was subjected to electric iron plating under the following conditions. In addition, saccharin was added with a product name “Emulgen A-500” manufactured by Kao Corporation as a stress relaxation agent and a polyoxyethylene derivative.

(Liquid composition) FeCl ₂ .4H ₂ O 2.0OM CaCl ₂ 1.62 M Saccharin 9.13 mM Malonic acid 0.1 mM Emulgen A-500 0.1 mM (Fixing conditions) Temperature 90 ° C. Cathode current density 5 A / dm ² Anode Pt plating time 46 min A plating layer having a thickness of 40 μm was formed by the above-described electric iron plating. The tensile strength of the iron plating film obtained from this plating solution was 48 kg / mm ² , which was higher than the iron plating film conventionally obtained from the iron plating solution.

Example 2 A rolled copper plate was subjected to electric iron plating under the following conditions. As a borooxyethylene derivative, product name “AMITE 105” manufactured by Kao Corporation was added.

(Liquid composition) FeCl ₂ .4H ₂ O 2.0OM CaCl ₂ 1.62 M Saccharin 9.13 mM Malonic acid 0.1 IM Amate 105 0.1 mM (Plating conditions) Temperature 90 ° C. Cathode current density 5 A / dm ² Anode Pt Plating time 46 min. A plating layer having a thickness of 40 μm was formed by the above-described electric iron plating. The tensile strength of the iron plating film obtained from this plating solution was 47 kg / mm ² , which was higher in tensile strength than the iron plating film obtained from the conventional iron plating solution.

(Embodiments 3 to 8) The addition amount of Emulgen A-500 was set to 0.5 (Example 3), 1.0 (Example 4),
(Example 5) Iron plating was carried out in the same manner as in Example 1, except that 3.0 (Example 6), 4.0 (Example 7), and 5.0 (Example 8) were used as the mmol.

Each has a thickness of 40 by electric iron plating.
A μm plating layer was formed. The tensile strength of the iron plating film obtained from this plating solution was 48, 49, 47, respectively.
It was 49, 47, 48 Kg / mm ² and had higher tensile strength than the iron plating film obtained from the conventional iron plating solution.

(Comparative Example 1) Electric iron plating was performed in the same manner as in Example 1 except that a liquid to which Emulgen A-500 was not added was used. The thickness of the obtained iron plating film was 40 μm, and the tensile strength of the iron plating film obtained from this plating solution was 33 kg / mm ² , which was equivalent to the iron plating film obtained from the conventional iron plating solution. Was.

Comparative Example 2 Electric iron was prepared in the same manner as in Example 1 except that the content of Emulgen A-500 in the plating solution was changed to 0.01 g / liter. I went messi. The thickness of the obtained iron plating film was 40 μm, and the tensile strength of the iron plating film obtained from this plating solution was 35 kg / mm ² , which was equivalent to the iron plating film obtained from the conventional iron plating solution. Was.

[0021]

By using the electric iron plating solution according to the present invention, it was possible to increase the tensile strength of the iron plating film, which was difficult in the past. Coatings obtained by various types of electroforming or iron foil production using the plating solution have good appearance and excellent mechanical reliability.

Claims (3)

[Claims] 1. An iron plating solution containing ferrous chloride as a main component, wherein at least one of water-soluble polyoxyethylene derivatives is present in an amount of 0.05 to 2.5 per mole of ferrous chloride.
An iron plating solution characterized by containing mmol. 2. The iron plating solution according to claim 1, wherein the water-soluble polyoxyethylene derivative contains one of polyoxyethylene alkylamine and polyoxyethylene alkyl ether as a main component. 3. A high tensile strength iron plating film obtained by using the electric iron plating solution according to claim 1 or 2.