JPS63140074A - Pretreatment for vacuum deposition of strip - Google Patents

Abstract

PURPOSE:To improve the adhesiveness of a metallic strip and vapor deposited layer by preliminarily cleaning the surface of the metallic strip, then electroplating a metal thereto at the time of forming thin films by a vacuum deposition method on the surface of the metallic strip. CONSTITUTION:After the metallic strip 2 to be formed with the thin films on the surface by the vacuum deposition method is precleaned in a tank 3 and is then subjected to an electrolytic degreasing treatment in an electrolytic degreasing tank 4 having anodes 4, 4''. The strip is then passed through a tank 5 and the surface thereof are rinsed and cleaned; in succession thereof, the strip is passed through a pickling tank 6, by which the oxide films on the surfaces are dissolved away. Such strip is passed through a pickling tank 7 and after the pickling soln. on the surfaces is rinsed and removed, the strip is passed through an elecroplating cell 8 and is between anodes 11. Electricity is conducted to said electrodes and the strip 2 as a cathode to form thin plating layers on the surface. The strip is rinsed in a rinse tank 9 and is sent to a vacuum deposition device after heating and drying 10. The stable vapor deposited layers having the excellent adhesive power are thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pretreatment method for vacuum deposition of a strip (steel sheet).

[Conventional technology and its problems]

As is well known, electroplating is a method for forming a thin film on the surface of a strip, but recently, techniques such as vacuum evaporation and cathode sputtering have been used instead of electroplating. This vacuum evaporation method heats and evaporates gold M (e.g. zinc), an insulator, etc. in a high vacuum atmosphere, and solidifies the evaporated molecules on the surface of the strip, which is the substrate. Surface cleaning treatment is considered the most important treatment. Depending on the pretreatment, the strength of the formed thin film, the pinhole grade, the physical properties of the thin film, etc. are greatly affected.

Therefore, conventional pretreatment methods for vacuum evaporation require a lot of know-how, but methods for removing impurities to obtain an ultra-clean surface include 1) mechanical grinding, 2) ion bombardment, 3) electric field evaporation, and 4.
) high-temperature heating, and (5) laser irradiation have been attempted.

By the way, conventional vacuum deposition pretreatment methods for strips require degreasing and removal of oxide films, and the latter is currently achieved by reducing oxide films (high temperature heating) and sputtering (ion bombardment) or electric discharge. (ion bombardment) and other methods are used. However, such methods for removing the oxide film are time-consuming, undesirable as they cause changes in mechanical properties due to the high temperature of the strip, and are not suitable for continuously removing the oxide film from the strip at low temperatures. There is a problem that there is no, or
Mechanical grinding may be considered as another method for removing the oxide film, but such a method has the problem of reoxidation of the strip, which is the substrate, if the vacuum atmosphere during vacuum deposition contains oxygen.

Note that pickling is naturally performed as a pre-treatment, and since the strip is dried in the air after pickling, an oxide film is formed on the surface of the strip again, which reduces the coagulation and adhesion of evaporated molecules. There's a problem.

[Means for solving problems]

Therefore, the present invention was created in order to solve such problems in the pretreatment of vacuum thinning of strips, and in particular, with the purpose of improving the adhesion during solidification of thin films.
To provide a pretreatment method for a vacuum vapor deposition method, which comprises degreasing the strip, pickling it, and then electroplating the strip with a thin layer of metal that is compatible with the vapor-deposited metal.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of the present invention will be explained in detail with reference to embodiments shown in the accompanying drawings. The accompanying drawing is a schematic illustration of an embodiment of the invention, showing a strip 2 unwound from a payoff reel 1.
is pre-cleaned in tank 3. For this preliminary cleaning, hot water is used.Next, electrolytic degreasing is performed in an electrolytic degreasing tank 4 to remove the oil film on the surface of the strip 2. 4',
4" indicates the anode 0 Then by passing through the tank 5,
The electrolytic degreasing liquid adhering to the surface of the strip 2 is rinsed.

Thereafter, the strip 2 is passed through a pickling tank 6 to remove the oxide film, and then washed in a rinsing tank 7 with water. After washing with water, the strip 2 is introduced into the electroplating tank 8 with a water film on it, and the electroplating layer 1 is coated with water of about several hundred angstroms.
administer. The electroplated strip 2 passes through the rinsing tank 9 again, is dried in the heating device 10 and is led into a vacuum for vacuum deposition. Anode 11 in electroplated tank 8
For example, when zinc is vapor-deposited in strip 2, it is the same metal as that.

The thickness of the electroplated metal in this embodiment was several hundred angstroms, but it should be within a range that can suppress oxidation of the surface of the strip 2.

In summary, the present invention has the following effects by adopting the configuration described in the claims.

〔Effect of the invention〕

Problems in the prior art can be solved. That is, since the strip is electroplated after degreasing and pickling and before vacuum deposition, a reoxidation-inhibiting film is formed in a short period of time with low-temperature pretreatment. In addition to efficient processing, the electroplated metal has good compatibility with the vacuum-deposited gold slurry, which improves adhesion through solidification. Although it is said that the adhesion is inferior to that of electroplating, the present invention can overcome this problem.

[Brief explanation of the drawing]

The accompanying drawings show schematic illustrations of embodiments of the invention. 2... Strip, 4... Electrolytic degreasing tank, 6...
- Pickling tank, 8... Electroplated tank.

Claims (1)

[Claims] A pretreatment method for a vacuum vapor deposition method, which comprises degreasing the strip, acid-washing the strip, and then electroplating the strip thinly using a metal that is compatible with the vapor-deposited metal as an anode.