JPS599179A - Surface treatment of thin metallic film - Google Patents

Abstract

PURPOSE:To make easily and inexpensively a thin metallic film rust preventive and corrosion preventive and to decrease the friction on the surface of the thin metallic film, by sticking a surface treating agent consisting of an org. compd. on said surface then polishing the surface of the metal with an abrasive material. CONSTITUTION:A surface treating agent consisting of an org. compd. is stuck on the surface of a thin metallic film such as iron, then the surface thereof is polished with an abrasive material and a surface treating agent having activity is stuck uniformly and thinly on the surface of the metal, whereby the generation of rust, corrosion, etc. is prevented without spoiling the characteristics of the metal and the friction on the surface of the thin metallic film is decreased. The above-mentioned surface treating agent is constituted of >=2 kinds of org. compds. having different molecular lengths of lipophilic groups, more particularly, hydrocarbon compds. or fluorohydrocarbon compd. such as perfluorocompds. having lipophilic groups of 5-22 carbon atoms. A thin metallic film of a magnetic material consisting a cobalt alloy such as cobalt-nickel alloy or the like is subjected to a surface treatment by the above-mentioned method, whereby the magnetic recording material having excellent performance is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for surface treatment of thin film metals, and in particular, to prevent changes in particles due to rust or corrosion of thin film metals, and to
The present invention provides a treatment method for reducing friction on a thin film metal surface.

A thin film metal is a metal layer having a thickness of several tens of μIn or less, and is composed of a substrate whose surface is only 1 inch thick, and a substrate on which the thin film metal is provided. You can leave it there.

A double series of thin film metals can be used, for example, as electrodes, and if the thin film metal is a magnetic material such as a Conort or Conor I alloy, it is useful for magnetic recording.

Conventionally, when a thin film metal is used as a magnetic recording H material, the surface friction of these thin film metals is large, and the thin film metal is damaged due to friction with a demagnetizing, recording or reproducing head, or friction with a guide portion of the thin film metal. The metal layer is extremely thin, making it difficult to perform uniform magnetic recording.
When rust occurs, it is relatively easy to corrode the entire metal layer. If a thin film metal is used, for example, as an electrode material Fl, there are problems such as changes in surface resistance and body resistance, changes in the electrical barrier between the thin film metal and the medium, and changes in charge injection efficiency into the medium. there were. For example, when used as a magnetic recording phase material,
There is a problem in that the magnetic properties are lost or significantly damaged due to the occurrence of rust.

The above problems are caused by the fact that the metal layer of the thin metal film is exposed. Therefore, it is possible to treat at least the surface of the metal layer. Activators are promising as a phase separation agent for this treatment. In other words, the hydrophilic groups are adsorbed onto the metal surface (the surface of the metal layer), and the lipophilic groups cover the metal surface, making it difficult for water or oxygen to come into contact with the metal surface, resulting in rust and corrosion prevention effects. In addition, the lipophilic group of the activator acts as a lubricant, making it possible to reduce friction. However, in order to obtain the above effects, it is necessary to adsorb the activator thinly and uniformly. In other words, if the layer treated with the activator is too thick, the electrode characteristics will be impaired and the magnetic signal will become weaker.

Another problem is that if it is thinned, it will be difficult to adhere uniformly, and rust will occur in areas where the activator has not adhered.

The present invention provides a surface treatment method for thin film metal 10 that can overcome these conventional problems.

The method for surface treatment of a thin film metal of the present invention is characterized by attaching an activator made of an organic compound to the surface of the thin film metal, and then polishing the surface of the thin film metal to which the activator has adhered with a polishing tool.

That is, the present invention was developed based on the discovery that by polishing the metal surface to which the activator was attached, the activator adhered uniformly and extremely thinly to the metal surface.The reason for this is obvious. Although there is no such thing, the following two points can be considered.

(1) Excessive adhering activator is wiped off by the abrasive when polished.

(2) 171 parts of the partially excessively adhered activator are deposited on the metal surface that was not previously deposited in A due to polishing.

It is thought that the activator adheres uniformly and thinly due to the two points mentioned above.

Next, the processing method of the present invention will be explained.

First, the method of attaching the activator to the thin film metal is to apply an activator liquid in which the activator to be used is dissolved or dispersed in a suitable solvent, and apply it to the thin film metal using a conventional method such as air knife coating or 7C-s coating. Apply it to the surface and let it adhere. Next, the activator adhering to the thin film metal is polished using an abrasive material at an appropriate pressure and speed.

Here, the materials used in the present invention will be explained.

First, the materials used for the thin film metal of the present invention include iron,
Examples of the activator include nickel, chrome, copper, chromium, or alloys thereof, and those having a carbon number of 6 to 2.
Hydrocarbon compounds of No. 2, carboxylic acids of fluorinated hydrocarbon compounds, sulfonic acids and salts thereof, quaternary ammonium series or betaine series are provided. Active agents having a fluorinated hydrocarbon compound as a lipophilic group have low friction; among these, 4-fluoro compounds are particularly preferred. In addition, when at least two types of activators with different molecular lengths of lipophilic groups (number of carbon atoms in the lipophilic groups) are used, microscopic irregularities are formed on the metal surface of the thin film metal due to the difference in molecular length, resulting in a low coefficient of friction. 1. Yes, the polishing material may be of a good quality that does not damage the metal surface of the thin film metal due to polishing. Specifically, for example, mirror-finished steel and vegetable fibers such as cotton.

Animal fibers such as silk and sheepskin are provided.

It should be noted that the above-mentioned examples are just examples and do not impose any unnecessary limitations on the present invention.

Next, concrete examples of the present invention will be explained. First, the thin film metal shown in Table 1 was coated with a second coated film using the air knife coating method.
Apply the activator liquid shown in the table and apply the activator to the metal surface for 3 seconds.
I made him wear it. These were polished using the polishing method shown in Table 3. In all polishing methods, the polishing rate was fixed and the thin metal film was moved. As a comparative example, unpolished thin film metals are listed in Table 4. Examples Nos. 1 to 13 and Comparative Examples Nn 1 to %10 were left at 90°C and 90% RH for one week, and then visually observed with a microscope. The corrosion was also evaluated using a scratch tester. In the table, the 0 mark indicates that there is no rust or scratches, the △ mark indicates that rust or scratches appear partially, and the X mark indicates that rust or scratches appear on the entire surface. The coefficient of dynamic friction was measured by contacting the metal surface of each thin film metal with a stainless steel rod having a diameter of 6 mm.

1. Table 1 Thin film metal coating Table 2 Talking agent liquid Table 3 Example 1 Table 4 Comparative example 2 As is clear from the method for surface treatment of thin film metal of the present invention According to this, it has remarkable effects on reducing the coefficient of dynamic friction, and preventing rust and corrosion.

Since the processing method of the present invention uses an extremely easily available polishing tool, it can be carried out at low cost. Furthermore, the processing method itself is simple. However, the present invention provides an industrially very useful treatment method.

Claims (1)

[Scope of Claims] (1) A thin film characterized in that a surface treatment agent made of an organic compound is attached to the surface of a thin film metal, and then the surface of the thin film metal to which the treatment agent is attached is polished by polishing. Metal surface treatment method. Ka゛. (2) The method for surface treatment of a thin film metal according to claim 1, characterized in that the N film metal snow magnetic phase is varied. (3) The method for surface treatment of a thin film metal according to claim 2 of the IJf1 revision, characterized in that the magnetic material is made of a cobalt-based alloy. (4) A method for surface treatment of a thin film metal according to claim 3, characterized in that a cobalt-nickel alloy is used. (6) Special feature ii/r characterized in that the surface treatment agent consists of at least two types of organic compounds whose lipophilic groups have different molecular lengths.
A method for surface treatment of a thin film metal according to claim 1. (6) The surface of the thin film metal according to claim 1 or 6, wherein the organic compound is a hydrocarbon compound or a fluorinated hydrocarbon compound having 6 to 2 carbon atoms and an oil group. Processing method. (a) A method for surface treatment of a thin film metal according to claim 6, characterized in that the fluorinated hydrocarbon compound is a perfluoro compound; (8) the surface treatment agent is a carboxylic acid type, a carboxylic acid metal salt; Among the groups consisting of sulfonic acid series, sulfonic acid metal salt series, quaternary ammonium ion series, phosphoric acid series, phosphoric acid ester series, phosphate metal salt series, betaine series, sulfonic acid amide series, ether series, and alcohol series. 2. The method for surface treating a thin film metal according to claim 1, wherein the method comprises at least one organic compound selected from the following. (9) A method for surface treating a thin film metal according to claim 1, wherein the abrasive material is made of a fibrous material. (+0) The method for surface treatment of a thin film metal according to claim 9, wherein the fibrous material is cotton.