JPS61179886A - Corrosion protecting method - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance in a joint part by making a Zr thin film layer to lie between the joint parts of rubber parts and steel or the joint parts of steel and steel. CONSTITUTION:The Zn thin film layer is made to lie between the joint part of the rubber parts, used for cushioning materials and sealants of, e.g., automobiles, household electrical appliances, etc., and the steel into which the rubber parts are integrated, or between the joint parts of the steel and the steel. In this way, superior corrosion resistance can be given to the joint parts even if coated after assembling the rubber parts and the steel, or the steel with the steel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing corrosion of a joint between a rubber part and a steel material or a joint between steel materials.

[Conventional technology] Conventionally, rubber parts such as cushioning materials are assembled to steel plates such as the outer panels of automobile bodies using bolts and nuts or screws, or after the steel plates are assembled together, they are coated with an undercoat or a topcoat. etc. are being carried out.

[Problem to be Solved by the Invention] When painting is applied after rubber parts are assembled to steel plates or after steel plates are assembled together, the steel plates at the joints are not coated and the coating gets into the minute gaps in the joints. Corrosion occurs due to water.

In order to prevent the above-mentioned corrosion, methods such as assembling the parts after painting is completed or replacing the steel plate with a rust-proof steel plate are used, but the former method requires changes to the line;
The latter method has problems such as increased costs.

[Means for Solving the Problems] The present invention relates to a method for preventing corrosion of steel materials at the joint portion by interposing a Zn thin film layer at the joint portion between a rubber part and a steel plate or between steel materials.

The steel material in the mating part with the Zn thin film layer has the same anti-corrosion ability as anti-rust steel material or steel material coated with zinc-rich brammer, so even if the rubber parts are assembled before painting as per the conventional line process, there will be no corrosion. Problems caused by this can be prevented.

[Example] Rubber parts in the present invention refer to rubber parts used in the manufacture of automobiles, motorcycles, household appliances such as electric refrigerators and electric washing machines, outdoor equipment such as outdoor air conditioners, and construction materials such as bridges. cushioning materials, sealing materials, decorative materials, etc. Specific examples of such rubber parts include chromate-treated materials assembled on the hinge side of automobile doors, cushioning materials assembled between the back and side panels of automobiles, hoods, back doors, etc. Examples include stopper materials.

In the present invention, the steel material refers to steel plates or structural steel materials for various uses to which the above-mentioned rubber parts are assembled, or steel materials to which steel plates for various uses or structural steel materials are assembled together with bolts, nuts, screws, etc. and then painted. It is about
There are no particular limitations as long as such steel materials are used.

In the present invention, a thickness of 10 to 100 μm is applied to a steel part where rubber parts are joined or where steel parts are joined together.
A Zn thin film layer of about 100 mL is provided.

There is no limitation on the method of providing the 1n3ii film layer, and for example, a thin film with a thickness of about 70 to 100 μl may be cut into a shape that allows the rubber parts and the steel material or the steel materials to overlap each other, and the cut film may be sandwiched between the parts.

When rubber parts are to be stacked together, a Zn11 film may be bonded to the surface of the rubber parts in advance.

When interposing the ZnH film layer in the joint part, metal is exposed on the surface of the steel material in the joint part, and 1nWl is applied to this.
l! Preferably, the layers are in contact and current is allowed to flow between the steel material and the Zn1il film layer. With this configuration, instead of the chemical change that would occur if water existed on the surface of the mated steel parts and tried to corrode,
A part of the Zn1l 9 layer is ionized, and ionized In is formed as a Zn layer on the surface of the steel material, which is difficult to ionize.
A similar effect can be obtained when rust-proof steel is used.

[Effects of the Invention] By using the method of the present invention, even if the rubber parts are painted after being assembled to the steel materials or after the steel materials are assembled together, it is possible to use rust-proof steel materials or steel materials coated with zinc-rich paint. As in the case, the corrosion resistance of the joint portion is improved.

Claims (1)

[Claims] 1. A corrosion prevention method characterized by interposing a Zn thin film layer at the joint between a rubber part and a steel material or at the joint between steel materials.