JPS6233797A - Black electrodeposition coating method for spoons or forks - 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 an electrodeposition coating method capable of forming a colored electrodeposition coating film with a good appearance.

Conventional technology and development are trying to solve the problem.
2. Description of the Related Art Electrolytic coating is applied to the surface of a workpiece for the purpose of imparting a beautiful appearance or improving corrosion resistance. When forming a coating film using this 'Fji coating,
The workpiece is supported by an S-conducting jig, and electricity is applied to the workpiece while applying electricity from this jig.
A coating film is not formed on the part of the object to be treated that comes into contact with the jig (the contact point). For this reason, when supporting the workpiece with a jig, we try to support the workpiece in areas where it is not noticeable even if a coating film is not formed, such as the back side of the workpiece.
Depending on the object to be treated, such measures may be difficult. In fact, the present inventors attempted to electrically coat the entire Western utensils such as spoons and forks, but no matter which part was supported with a jig, no coating film was formed on the supported parts, especially colored paint. In this case, the uncoated portion was conspicuous, making it impossible to form an electrodeposited film with a good appearance.

For example, Figures 1 and 2 show a state in which the neck 2 of a spoon 1 is supported by a jig 3, and a coating film 4 is formed on the entire spoon 1 except for the neck 2, which is supported by the jig 3. But the third
As shown in the figure, no coating film is formed on the neck' portion 2, resulting in a non-coating portion 5, which significantly impairs the appearance.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a detonator coating method capable of forming a colored electrodeposited coating film with a good appearance without noticeable uncoated areas.

(In order to achieve the above object, the present invention applies colored electrodeposition coating to the object to be treated and forms colored electrodeposition coating 11i! on the surface of the object to be treated.) When the object to be treated is colored and electrodeposited, an IP'Fi+4 film of the same color as the four-color 'man coating is formed on the part where the object is supported by a jig.
Two coats of paint are applied.

According to the present invention, the object to be treated is 'i! 8＠When painting, color electrodeposit the area where the object to be treated will be supported with a jig in advance! Since a conductive film of the same color as the 11i phloem is formed, it will not be noticeable even if an electrodeposited film is not formed at this location. Also, is this part s? Since an rJ film is formed, there is no problem with current flow even if this part is supported with a jig, and the i! IT painting can be done.

The present invention will be explained in more detail below.

In the I/4th coating method according to the present invention, first, before performing the electrodeposition coating, the electrodeposition coating is applied to the object to be treated, and then the electrodeposition coating is applied to the object to be treated. A conductive film of the same color as the V4 coating film to be formed is formed on the part supported by the member.

For example, when forming a black electrodeposition coating film, a black conductive film is formed.

In this case, the conductive film may be formed only on the 15 supports of the object to be treated using the temporary jig, or may be formed on desired parts including these support points, and may also be formed on the surface of the object to be treated. may be formed. Further, the method for forming the conductive film is not particularly limited, and is appropriately selected depending on the material of the object to be treated, the purpose of use, etc., and electroplating, anodic oxidation, etc. are employed. For example, when forming a black conductive 7r1 bamboo 7eI film, a black nickel plating method or a black chromium plating method is effectively employed.

Furthermore, a colored conductive film can be formed by employing a known metal coloring method either directly on the object to be treated or after forming a desired metal plating film thereon.

The thickness of the conductive film is not limited, but is usually 0.1~
It is preferable to set the time to about 20 μs.

Note that the material of the object to be treated is determined by the formation of the conductive film and the
Any material that can be painted may be used, and in addition to various metals, IJ electrified plastics and the like can be used.

In the present invention, after forming a colored conductive film on an object to be treated in this way, the colored conductive film is formed on the object to be treated. ! ff1 of the same color as the ll membrane
l! It is used for painting. In this case, the electrolytic coating may be an anionic electrocoating or a cationic electrocoating, but if the objective is to improve the mountability, a cationic electrocoating is preferable. In J3 of the present invention, there are no particular limitations on the bath and coating conditions used for electrodeposition, other than the use of baths and conditions that can form an electrodeposition coating film of the same color as the colored IP electrolytic coating. Commonly used baths and conditions can be used. Also,
There is no limit to the thickness of this coating, but it is usually 10 to 20 μ-
It is preferable that

In the present invention, when performing electrodeposition coating, the part where the colored conductive film is formed is supported by a jig, and since the support part of this jig is conductive, it is difficult to apply the electrodeposition coating. There is no problem at all when carrying out this process, and the parts that are supported by this jig and hit by the jig are not coated with the fi-coated film. Since the coating is formed, the external lq is not impaired.

The electrodeposited electrode coater can be subjected to a suitable erosion treatment if necessary, and can further form a clear coating film on the colored electrodeposition coating film.

Effects of the InventionSongAccording to the present invention, a conductive film of the same color as the electrodeposition coating film is formed in advance on the part supported by a jig when the object to be treated is electrocoated. Do not apply electricity to the part supported by the jig.
Even if a paint film is not formed, it is not noticeable and maintains a good appearance. Furthermore, since the parts supported by this jig are conductive, there is no problem in carrying out the electrical 71 coating.

Examples are shown below to specifically illustrate the present invention, but the present invention is not limited to the following examples.

(Example 1) Prepare a spoon made of stainless steel using a conventional method.
i! After applying nickel strike plating to the entire surface of L, Tatoshi, and A, and applying 5 μl of bright nickel plating,
Black chrome plating was performed using a black chrome plating solution with the following composition.

Black chrome plating composition, plating Hand-composed romic acid 300t/J Glacial acetic acid 3)/J Urea 37/J Plating condition temperature 25℃ Cathode' upstream density 50A/da2 Plating time
Next, for 3 to 5 minutes, support the neck of the spoon with a jig as shown in Figure 1.2 and apply black cationic electrodeposition! '8 was applied.

Cationic electrodeposition coating r' Electrodeposition coating bath Epoxy resin solid content 18% (cationic type black) Ni-acid 1011/
J cellosolve solvent 10yf/J'1Fi
rt E! A condition bath temperature
28 ± 1 °C bath voltage 12
0V current density IA/c 1m or less Current conduction time 1 minute baking Drying condition temperature 180℃ time
When observing the spoon on which the black electrocoating film was formed by the above method for 20 minutes, it was found that the electrocoating film was not completely formed on the neck portion of the spoon supported by the jig. This part has a blackish plating film, so it is
The state in which the armor pattern is not formed is not noticeable, and the overall black appearance is good. Especially when a clear coating film is formed on the surface, it is difficult to distinguish between the areas where the electrodeposition film is not formed. It was something.

[Example 2] Instead of black plating in Example 1, 2 μml of black nickel plating was applied with the following composition and conditions! Example 1 except that r was applied.
In the same manner as above, a stainless steel spoon was plated and coated with Kadion Denko.

Nickel plating Plating conditions Composition Nickel sulfate 702/JtaS Nickel ammonium 40')/jtaf11@1
25 n/l sodium thiocyanate
20'i/Jp++
5.0 Plating conditions Maro 55℃ Cathode current density 1.0△/dKi2 Plating time
10 minutes (Example 3) After a stainless steel spoon was treated with +V+ in a conventional manner, its entire surface was colored black by employing an acidic black oxidation method.The bath composition and treatment used in the acidic black oxidation method are shown below. Indicates conditions.

1 °-゛no Treatment conditions Bath composition 1a F15 180 parts Chloric acid powder 50 parts Water 20
0 part processing conditions temperature 95
℃Pl immersion time: 30 minutes Next, Example 1
In the same manner as above, black Kadion Den paint was applied.

The spoon yl in Example 2.3 will eventually become b electric rj
The state in which no paint film was formed was not noticeable, and the overall black appearance was good.

In addition, in Example 3, similar results were obtained when the alkaline M black oxidation method was adopted instead of the acidic black oxidation method.

(Example 4) A stainless steel spoon was pretreated by a conventional method, and then nickel strike plating was applied to the entire surface thereof.

Next, what about the cationic electron of Example 1? 1 Paint bath is alkali resistant,
Taking advantage of its chemical resistance, as shown in Figure 4, alkali-soluble resist ink is printed on the parts of spoon 1 where electrodeposition coating is not desired by screen printing to form a resist film 5.5. Formed. The tip of the spoon 1, including the neck 2, was immersed in the black chromium plating bath of Example 1 and plated to form a black plating 6 only on the tip of the spoon 1. Next, black cationic electrodeposition coating was performed in the same manner as in Example 1. As a result, as shown in FIG.
:X coating film 4 was not formed.

Next, dip this spoon in a caustic soda solution to measure nθ.
After the resist coatings 5, 5 were dissolved and removed, bright nickel plating was applied to these parts by a spray plating process, and gold plating was applied to the remaining parts.

As shown in FIG. 6, the resulting spoon had gold plating removed in one part, and the other part was black, making it highly decorative. It should be noted that the jig support part during electrodeposition coating was not noticeable because the black chrome plating film 8 was formed, and no defective appearance of the black part occurred.

[Brief explanation of the drawing]

Figure 1 is a front view of the 6 parts of the spoon supported by a jig, Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a conventional method. As shown in Figure 4, a front view showing the state of the spoon after the neck of the spoon is supported by a jig to form an electrodeposited coating film, and Figures 4 to 6 each show an embodiment of the spoon according to the method of the present invention. FIG. 3 is a front view sequentially illustrating changes in the appearance of the spoon when applied to the spoon. 1...Spoon, 2...MR,,3...Jewel, 4
...paint film. Applicant Uemura Kogyo Co., Ltd. Agent Patent Attorney [Takashi Kojima Figure 2

Claims (1)

[Claims] 1. When applying colored electrodeposition coating to the object to be treated to form a colored electrodeposition coating film on the surface of the object, support the object with a jig when applying the colored electrodeposition coating to the object to be treated. An electrodeposition coating method, which comprises forming a conductive film of the same color as the colored electrodeposition coating film on the area to be coated, and then applying colored electrodeposition coating.