JPH03247777A - Rust preventing treatment for sliding member - Google Patents

Abstract

PURPOSE:To produce a sliding member having rust preventing property and sliding characteristics and improved in durability by forming a rust preventive film of zinc material on the surface of a base material by means of mechanical plating treatment and impregnating this rust preventive film with solid lubricant. CONSTITUTION:After alkaline degreasing treatment is applied to the surface of a base material (Fe) 6, a zinc or zinc-iron alloy powder of about 0.2-0.7mm grain size is projected onto the surface of the base material, by which a porous rust preventive film 7 is formed on the base material surface. Subsequently, the base material 6 is immersed into a coating bath in which PTFE grains 8 are dispersed, by which the PTFE grains 8 are impregnated into the voids among mutual alloy grains 9 forming the rust preventive film 7. This base material 6 is subjected to evacuation treatment and sintering treatment so as to be formed into a product. By this method, the sliding member capable of maintaining the effect of the solid lubricant over a long period can be obtained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rust prevention treatment method for sliding members, and in particular, a rust prevention treatment method that achieves both rust prevention and sliding properties and improves durability. Regarding.

Conventional technology and its problems For example, in the automobile door hinge 1 shown in FIG.
It is important to prevent rust on the hinge pin 2, which is the sliding member, to ensure smooth sliding, and to maintain smooth door opening/closing operation over the long term without producing squeaks. becomes. 3 is the vehicle body side hinge, 4 is the door side hinge, 5
is Bush.

Conventionally, hinge pins 2 in I- have been mainly made of iron-based materials with zinc plating treatment due to cost advantages, etc., but as shown in the attached table, they have particularly good sliding properties and durability. In terms of (wear resistance), 1 minute is not necessarily satisfactory, and there remains the problem of poor practical performance.

On the other hand, as shown in the attached table, there are various surface treatment techniques that can replace galvanizing, but none of them have been applied to the rust prevention treatment of the hinge pin 2 because they have advantages and disadvantages. In particular, regarding the use of stainless steel for the hinge bin 2, not only is there a difficulty in sliding properties as shown in the attached table, but also poor workability and increased cost are major obstacles.

Therefore, as an anti-corrosion treatment technology for sliding members used under relatively harsh conditions, a fluororesin-based polytetrafluoroethylene (hereinafter referred to as PTFE) is applied over the zinc-plated steel.
It is called. For example, Teflon is a typical example.)
Coating is seen as a promising solution for achieving both rust prevention and sliding properties.

However, simply coating the galvanized layer with PTFE will result in poor durability due to the lack of adhesion of PTFE, and it will not be possible to maintain the inherent good sliding properties of PTFE over the long term. There's a problem.

The present invention has been made in view of the problems mentioned in 1-1 below, and its purpose is to use the plating process of zinc or zinc-iron alloy in combination with the coating process of solid lubricant such as PTFE. The object of the present invention is to provide a treatment method that can maintain the effects of a solid lubricant over a long period of time.

Means for Solving the Problems The rust prevention treatment method of the present invention includes the steps of forming a rust prevention coating (plating layer) of zinc or zinc-iron alloy on the surface of a base material by mechanical plating treatment, and P on the rust coating
It contains a culm impregnated with a solid lubricant such as TFE.

Mechanical plating treatment (mechanical plating treatment) is performed by, for example, the shikosoto blasting method as shown in Japanese Patent Application Laid-open No. 61-38870.
A porous antirust coating (plating layer) is formed on the surface of the substrate by projecting zinc or zinc-iron alloy powder having a particle size of about 2 to 0.7 mm onto the surface of the substrate.

PTFE or molybdenum disulfide is used as the solid lubricant, and the base material subjected to the mechanical plating treatment described in 1- above is immersed in a coating liquid in which PTFE or molybdenum disulfide is dispersed. Impregnate the voids in the rust film with solid lubricant. Then, after impregnating it with a solid lubricant, it is sintered to produce a product.

As a result, the solid lubricant is filled and retained in the voids in the porous anti-corrosion coating, making it more lubricant than when the solid lubricant is coated on one side of the anti-corrosion coating in the past. Performance can be maintained for a long time.

Example As shown in FIGS. 1 and 2, a base material 6 made of Fe material
After degreasing with alkali, mechanical plating is performed under the following conditions to form a porous rust-preventive coating 7 on the surface of the base material.

Processing conditions Shot material: Zinc-iron alloy powder particle diameter: 0.2-0.7 shoulderl Shot speed = 55-60 R/sec Processing time: Approximately 20 minutes After mechanical plating treatment, PTFE particles were dispersed. The base material 6 is immersed in a coating liquid (rust preventive oil), and particles of PTFEB, which is a solid lubricant, are impregnated into the voids of the rust preventive coating 7 of the zinc-iron alloy.

Here, when using molybdenum disulfide as a solid lubricant in place of P T FE B described in 1. Soak material 6.

Furthermore, the base material 6 impregnated with a solid lubricant is, for example, 0.
The mixture is heated at a temperature of about 1-1360'C under a reduced pressure of 5 atm for about 1 hour, and then allowed to cool.

FIG. 2 is a cross-sectional view of the rust-preventive coating 7 obtained by the treatment method described in L.
It can be seen that the voids between the alloy particles 9 forming the shape 1 are impregnated with particles of PTFE 8, which is a solid lubricant.

Effects of the Invention According to the present invention, a rust-preventing film of zinc or zinc-iron alloy is formed by mechanical plating, and the rust-preventing film is impregnated with a homogeneous lubricant such as PTFE. By doing so, it is possible to achieve both the rust prevention properties of the rust prevention coating itself and the sliding properties of the solid lubricant, and at the same time, the solid lubricant is filled and retained in the voids of the rust prevention coating of zinc or zinc-iron alloy. Therefore, compared to conventional methods, the lubrication performance of solid lubricants can be maintained for a longer period of time.
It is possible to achieve both durability and durability.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram showing one embodiment of the present invention, FIG. 2 is a sectional view of a rust-preventive coating obtained by the method of the present invention, and FIG. 3 is an explanatory diagram of an automobile door hinge. 6... Base material, 7... Rust prevention coating, 8... PTFE
(solid lubricant).

Claims (1)

[Claims] (1) A slide characterized by comprising the steps of forming a rust preventive film of zinc or zinc-iron alloy on the surface of a base material by mechanical plating, and impregnating the rust preventive film with a solid lubricant. Rust prevention treatment method for moving parts.