JPS59104494A - Formation of film - Google Patents

Abstract

PURPOSE:To inhibit the formation of a film at a dent part, by adding a liquid crystal to an electrolyte for forming a film on the surface of a cathode to debase round deposition. CONSTITUTION:Liquid crystals (e.g. paramethyl oxybenzylidene para-butyl aniline) 25 are dispersedly added to an electrolyte 22 in an electrolytic cell 21. An anode 23 and a cathode (i.e. a sample) 24 are dipped in said electrolyte 22. By applying an electric current between said two electrodes 23 and 24, a film 32 is formed on the sample 24. In the aforementioned method, an electric field is arranged along one direction by the added liquid crystals 25, to debase round deposition. Thus, the film 32 is formed at a required part without the formation of any other film on an unrequired dent part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a film in an electrolytic solution, typified by plating.

Conventionally, in plating processes and the like, film formation has been carried out by a method as shown schematically in FIG. That is, an electrolytic cell 1 is filled with an electrolyte 2, an anode plate 3 and a sample 4 are placed in the electrolyte 2, connected to the cathode, and the surface of the sample 4 is heated by supplying power from a power source. A plating layer is formed.

The film formed by the above method is as shown in FIG.
The method of shedding when No. 1 has a complicated shape has the disadvantage that a film is formed in the recesses even when it is not necessary to form a film in the recesses.

It is an object of the present invention to eliminate the drawbacks of the prior art and to provide an electrolytic solution that does not form a film in concave portions where film formation is unnecessary.

The basic structure of the present invention to achieve the above object is that in the film forming method, liquid crystal is added to the electrolyte, an anode is connected to the anode plate, a cathode is connected to the sample, and the surface of the sample is It is characterized by forming a film.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 2 schematically shows the film forming method according to the present invention. An electrolytic cell 21 is filled with an electrolytic solution 22, and the electrolytic solution 22 contains a liquid crystal (MBBA). - butyl aniline, etc.) 25 is added in a dispersed manner by adding a dispersant (surfactant),
An anode plate is connected to the anode in the diionizing liquid 22, a sample plate is connected to the cathode, and a film is formed on the surface of the sample plate.

When a film is formed on the surface of a sample using the method described above, as shown in FIG. 2, the film is not formed in the recesses on the surface of the substrate 31 of the sample, but the film 32 is formed in other parts.

That is, this phenomenon occurs because the added liquid crystal is aligned in one direction due to the electric field and prevents ions from reaching the recess. In this way, there is an effect that a film can be formed without forming a film on unnecessary parts.

The present invention is not limited to plating treatment, but can also be used to form a film by electrodrifting treatment.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a film forming method according to the prior art, FIG. 2 is a sectional view showing the formation shape of a film on a sample surface 7 according to the prior art, and FIG. 3 is a schematic diagram showing a film forming method according to the present invention. Fourth
The figure is a cross-sectional view showing the shape of a film formed on a sample surface according to the present invention. l, 21Φ・Electrolytic tank 2,22・・Electrolyte solution 3,23・
・Anode plate 4, 24...Sample part...Liquid crystal 11. Figure 2

Claims (1)

[Claims] A liquid crystal is added to an electrolytic solution, an anode plate and a sample are placed in a dielectric group liquid, an anode is connected to the anode plate, a cathode is connected to the sample, and a film is formed on the sample surface. film formation method.