JPS6320188A - Method for press welding metallic foil on metallic surface - Google Patents

Abstract

PURPOSE:To easily obtain a surface-treated member having excellent corrosion resistance at a low cost by subjecting a metallic base material to a blasting treatment to form a rugged surface, imposing metallic foil thereon and subjecting the metallic foil again to the blasting treatment. CONSTITUTION:The surface of the metallic base material requiring cladding is subjected to the blasting treatment with a grit material for blasting and thereafter, the metallic foil is imposed on the blasted surface and is subjected to the blasting treatment from above again by using the same blast material, then the base material and the foil are press welded. The metallic foil is preferably subjected to >=3 times of repetitive treatments rather than one time of the blasting treatment in order to have the higher joint strength of the press welding.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention consists of pressing a metal foil onto a metal surface.
The present invention relates to a method for manufacturing a surface-treated member with excellent corrosion resistance. More specifically, the present invention relates to a method for manufacturing a plated metal member in which pressure plating is performed using metal foil and a pressure plating layer of metal foil is provided on the surface of the metal member.

(Prior Art) Hot-dip plating and electroplating are the most common methods for surface treatment of steel materials for the purpose of corrosion prevention. This method requires equipment depending on the size of the steel material, and is generally carried out on a large scale in a dedicated factory, which naturally limits its scope of application. Particularly in the current situation where anti-corrosion treatments are being applied in many different fields in many fields, such plating methods are no longer appropriate, and anti-corrosion treatments that are easier and cheaper are desired. ing.

Other anticorrosive surface treatment methods include mechanical plating, thermal spraying, CVDXPVD, and cladding. However, none of the above-mentioned demands can be satisfied yet.

Recently, a method has been proposed in which a new blasting material is used as the blasting material in the blasting process and a zinc coating is applied (
Special Publication No. 59-9312). According to this method, iron or iron alloy is used as a core, zinc or zinc alloy is deposited around this core through an iron-zinc alloy layer, and a blast material consisting of an aggregate of independent particles is made of iron or zinc alloy. A zinc coating is formed by spraying onto the surface of an iron alloy.

It is true that this method is easy to perform and is promising for on-site corrosion prevention treatment. However, this method is currently only capable of depositing zinc or zinc alloys, and unlike general plating films, these films are porous, which poses a problem in terms of corrosion protection. Therefore, after the adhesion treatment, it is necessary to perform a chromate treatment using an aqueous treatment liquid to ensure corrosion resistance, which is a rather expensive treatment method.

Thus, today there is a need for an inexpensive treatment method that not only ensures sufficient corrosion resistance but also allows for easy treatment, including the ability to perform on-site repairs.

(Problems to be Solved by the Invention) An object of the present invention is to provide a simple and inexpensive manufacturing method for a surface-treated member with excellent corrosion resistance.

Another object of the present invention is to provide an inexpensive method for surface treatment of objects for which surface treatment other than painting is difficult on site, such as surface treatment of large structures, surface treatment of existing structures, surface treatment of renovation and repair parts, etc. The object of the present invention is to provide an anti-corrosion treatment means.

(Means for Solving the Problems) The present inventors have made repeated studies focusing on so-called blasting to achieve the above-mentioned objectives. However, in order to simplify the process, we investigated various surface treatment methods that could be applied on-site.
As a result of our research, we found that by activating the surface of the base material through blasting, giving it an appropriate roughness, and placing the metal foil on top of it and then blasting it again, we were able to press-bond the metal foil.
The present invention was completed based on the discovery that such a metal foil pressure welding method is an extremely effective means for achieving the object of the present invention.

Therefore, the gist of the present invention is to apply blasting to a metal base material to make the surface uneven, place a metal foil on the uneven surface, and then apply blasting to this metal foil again. This is a method in which metal foil is pressure-bonded to a metal surface.

Here, the above metal foils include 80, z Cu, Sn, Z
n, alloys thereof, etc., and many others can be considered depending on the combination of the type of base metal and the desired corrosion resistance. Further, the pressure welding of the metal foil may be repeated for many layers to obtain a plated layer of the required thickness.

Note that "foil" generally refers to one with a thickness of 100 μm or less, and is not particularly limited. In the present invention,
Preferably, one with a thickness of 10 to 30 μm is used.

As described above, according to the pressure contact plating method of the present invention, by applying blasting, the surface of the metal base material is first cleaned and surface activated, and then the surface properties and particle pressure unique to the blasting method are improved. Plating is carried out by pressing a metal foil onto a base metal. The blasting conditions during the above-mentioned cleaning and activation processing and the blasting conditions during pressure contact may be changed as appropriate.

(effect) The specific processing method will be briefly described below.

First, the surface of the metal base material that requires coating is coated with blasting grid material (#30) or alumina grains (1130
-11100) (hereinafter simply referred to as “blasting material”)
After that, the thickness is preferably 10~
A 30 μm metal foil (AQ, Zn, Sn, Cu) is placed on the blasted surface, and generally the same blasting material is used again to perform blasting on top of it and press it. The blasting conditions at this time were a pressure of 3 to 7 kg/cd;
It has been experimentally confirmed that optimal bonding is achieved when the nozzle diameter is 5 to 10III and the distance between the nozzle and the metal surface to be treated is 5 to 20 cI.

Next, in order to further improve the bonding strength of pressure welding, it is preferable to perform the blasting process on the metal foil three times or more more than once, and it is particularly preferable to repeat the process about 5 to 10 times. This improves the bonding strength.

The optimal thickness of the metal foil coating layer is 10 to 30 μm, but if you want to make the coating layer thicker, after the first coating layer is completely bonded, place the metal foil again and repeat the same process as the first layer. All you have to do is carry out the treatment. Although it is possible to join many layers together,
If the overlap is 100 μm or more, the strength of the metal foil itself is low, so if the overlap is larger than this, the effect will decrease.

Most base metals can be coated, including carbon steel and alloy steel.

Further, as the covering metal foil, AQ, HeQ alloy, Zn, Zn alloy, Sn, Sn alloy, Co, Cu alloy, etc. can be used.

EXAMPLES Hereinafter, the present invention will be explained in more detail according to examples, but the scope of the present invention is not limited in any way by the following examples.

EXAMPLE In this example, the surface of the metal base material was first cleaned by blasting and roughened, then a metal foil was placed on the clean roughened surface and the blasting treatment was repeated again. If necessary, the blasting treatment of this foil was repeated as many times as required.

That is, the metal base material mentioned above is steel material (SS41 material 2
．． 3t x 100 x 100mm) and blasting material (electrofused alumina #36) was used on the surface to
kg/cJ, nozzle diameter 7mm, blasting distance 10c
A clean uneven surface was obtained by blasting with m. Next, a piece of copper foil (thickness: 15 μm) was placed on the blast-treated surface of the steel material, and the blast treatment was performed again from above. In this case, the blasting process was carried out 5 to 10 times, as one pass was insufficient to achieve sufficient bonding. If you want to thicken the coating layer, apply the next AQ layer on top of the blasted one layer.
Just put foil on it and perform the same blasting process.

The adhesion of the metal foil plating layer thus obtained was evaluated. The results are shown together with the processing conditions in Table 1.

Table 1 In addition, in Table 1, the product name -wA#36: Fused Alumina 36 Mesoyu G
30 Nigerid (Iron) 30 Mesoyu 5RWl120
: Sintered alumina 20mS.

In addition, the evaluation of bonding strength is as follows.

Δ: The foil has become thin. The blasting material is fine particles (11
00), the metal foil may be torn during blasting, but in that case, it is best to stack 2 to 3 sheets.

(2) There is no difference between fine particles and coarse particles in the blasting material for blasting the coating layer, but the adhesion of the coating layer is weak for glass beads (<1 m+nφ).

(3) If the spraying pressure is less than 2 kg/cJ, the coating layer will wrinkle and the adhesion will be weak.

Next, for each plating material shown in Table 1, the surface properties and mechanical properties of the treated material were investigated, and the results are shown below. Table 2 examines the effects of different blasting materials on surface roughness.

The surface roughness of the coating layer is rougher than the surface roughness of the base material in the blasting material of second surface fused alumina (HA 1136), and the surface roughness of the coating layer is smaller than that of the base material in the case of sintered alumina (SRW 1120). However, due to the difference in surface roughness, no significant difference was observed in the results of the bending test and tensile test described below. According to examination of the cross sections of these treated materials, it was found that the coating layer was bonded to the base metal within a range of 5 to 15 μm.

Next, similarly, as one evaluation method of the bonding strength of the film,
A bending test was conducted and the results are summarized in Table 3.

Except for the case of glass beads, there was no damage to the film in the two-fold bending test, and the surface condition was good.

Next, in the case of the same <Afll foil, the interfacial bonding strength between the blasted film and the base metal was investigated by a tensile test. The results are shown in Table 4.

From the results shown in Table 4 above, the interfacial bonding strength has sufficient bonding strength regardless of the quality of the blasted surface. In addition, as a result of investigating pinholes in the film due to corrosion tests,
It was also found that there were no defects such as pinholes.

(Effects of the Invention) As described in detail so far, the pressure plating by blasting of the present invention provides the following effects.

(1) There are no restrictions on the location of treatment, and treatment can be applied to existing structures.

(2) Processing can be performed regardless of changes in the treated surface and the unevenness of the treated surface.

(3) Various metals (Al1% Sns Zns Cu and alloys thereof, etc.) can be targeted.

(4) For the blasting material, commercially available products such as iron and alumina can be used, and the equipment is extremely inexpensive.

(5) Since it is a dry method, no post-treatment is required after treatment;
There is no need to worry about hydrogen embrittlement.

(6) A good corrosion resistance effect can be expected by the coating treatment.

It should be noted that metal foil has traditionally been used to decorate arts and crafts, but not only do they differ in purpose, but in many cases the base is wood, paper, cloth, etc. They are essentially different in their bonding form.

Claims (1)

[Claims] A method of pressure bonding metal foil to a metal surface, which consists of applying blasting to a metal base material to make the surface uneven, placing metal foil on the uneven surface, and then applying blasting to this metal foil again. .