JPH06346255A - Treatment of surface of stainless steel - Google Patents

Abstract

PURPOSE:To improve the wear resistance of stock and to prevent the aggregation of the stock by subjecting cleaned stainless steel stock to etching treatment, thereafter coating the surface with fluorinated resin, drying it and executing heating treatment. CONSTITUTION:The stock of stainless steel is cleaned, is thereafter immersed in a corrosive liq. such as a marble soln. and is subjected to etching treatment to form a recessed part of several mum on the surface of the stock, which is subjected to neutralizing treatment by NaOH or the like, is water-washed and is dried. Next, the surface of this stock is coated with fluorinated such as tetrafluoroethylene, which is dried and is subjected to heating treatment. In this way, the fluororesin infiltrates into the recessed part formed on the surface of the stock form a coating layer having good adhesion at a low temp. without generating strains, by which the service life of the stainless steel stock can remarkably be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method for stainless steel.

[0002]

2. Description of the Related Art Generally, in the case of a sliding member using a material such as stainless steel, in order to improve wear resistance and prevent adhesion, the surface of the material is coated with a dry film or the like, Alternatively, the raw material gas containing the components of the produced compound is fed into a heating furnace at about 1000 ° C.
Chemical vapor deposition for depositing ultra-hard materials such as C, TiN, and Al ₂ O ₃ to a thickness of ₂ to 10 μm (Chemical Vapor
Deposition) or a reaction gas such as TiC, Ti, which is a reaction product of a metal and a reaction gas, which are the bases of the generated compound, are ionized by glow discharge in a decompression furnace at about 500 ° C.
Physical vapor deposition (Phy) for depositing N or the like to a thickness of 2 to 10 μm.
The medical Vapor Deposition) was performed.

[0003]

However, since an extremely thin passivation film is formed on the surface of stainless steel at room temperature at room temperature, if the surface of the material is coated with a dry film or the like as described above, the adhesion will be poor. Is insufficient to improve wear resistance and prevent adhesion, and in processes such as chemical vapor deposition and physical vapor deposition, the temperature of the material rises to around 1000 ° C or around 500 ° C, which causes strain. It was also a cause of the occurrence and was not a very preferable treatment method.

In view of the above situation, the present invention aims to provide a surface treatment method for stainless steel which can improve wear resistance and is effective in preventing adhesion.

[0005]

According to the present invention, a cleaned stainless steel material is subjected to an etching treatment by immersing it in a corrosive liquid, neutralized, washed and dried, and then a fluororesin is applied to the surface. It is characterized in that it is dried by heating and heat-treated.

[0006]

Therefore, when the washed stainless steel material is subjected to an etching treatment by immersing it in a corrosive liquid, neutralized, washed and dried, a fluororesin is applied to the surface and dried, and a heat treatment is performed. By the etching treatment, the fluororesin enters into the concave portions of several μ formed on the surface of the material, the adhesion of the coating layer by the fluororesin to the material is improved, and the heat treatment is performed by chemical vapor deposition or physical vapor deposition. Since the temperature is lower than that in the case of such treatment, there is no concern that the material will be distorted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the surface treatment method for stainless steel according to the present invention. First, a stainless steel material processed to have a predetermined sliding surface roughness is washed, and then a marble solution or the like is used. An etching treatment is performed by immersing it in a corrosive liquid for about 10 minutes, and a neutralizing agent such as caustic soda (NaOH) is used. The marble solution is hydrochloric acid (HC
l) 20 cc, water (H ₂ O) 20 cc, copper sulfate (C
uSO ₄ ) was mixed at a ratio of 4 g.

Next, after the neutralized stainless steel material is washed with water, brushed and dried,
A fluororesin such as tetrafluoroethylene is spray coated on the surface, dried, and heat-treated at about 260 ° C. for about 10 minutes.

As a result, the fluororesin such as tetrafluoroethylene enters into the recess of several μ formed on the surface of the material by the etching treatment, and the adhesion of the coating layer by the fluororesin to the material becomes good. In addition, since the heat treatment can be performed at a lower temperature than in the case of treatment such as chemical vapor deposition or physical vapor deposition, there is no fear that the material will be distorted.

In this way, the wear resistance of the material can be improved and the adhesion of the material can be prevented, and the life of the material can be greatly extended.

The stainless steel surface treatment method of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0013]

As described above, according to the surface treatment method for stainless steel of the present invention, the wear resistance of the material can be improved and the adhesion of the material can be prevented, and the life of the material can be greatly extended. The excellent effect of being able to do it can be produced.

[Brief description of drawings]

FIG. 1 is a flowchart of an embodiment of the present invention.

Claims (1)

[Claims] 1. A stainless steel material that has been washed is subjected to an etching treatment by immersing it in a corrosive liquid, neutralized, washed and dried, and then a fluororesin is applied to the surface and dried.
A surface treatment method for stainless steel, which comprises heat treatment.