JPS5816071A - Method for forming dissimilar metal on aluminum or aluminum alloy - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance of a metal-clad Al type metal which is thoroughly removed of the product of reaction by placing a halide of other metal on the surface of an Al type metal, and heating the same to form the metallic layer thereof, then cleaning the same with cleaning water of specific temp. CONSTITUTION:A halogenated metallic salt 2 such as copper chloride is placed on the surface of a base material 1 of Al or an Al alloy, and both are heated to above the temp. at which the substitution reaction of the material 1 and the metallic salt 2 initiates. The Al and the copper chloride react and the Al is converted to Al halide; at the same time, a chemical equiv. of Cu 20 deposits and incorporates the Al 11 of the base metal in one body. Immediately after the end of the reaction, the material is put in boiling cleaning water, by which the material is cooled and the Al halide and Al2O3 which are the product of reaction are removed easily and thoroughly. The metal clad Al material of high corrosion resistance is obtained without using tacky hydrocarbons used in the prior art hence without receiving the influence of the combustible gases and soot generated from hydrocarbons.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for forming a different metal layer on the surface of a base material made of aluminum or an aluminum alloy.

Conventional methods of this type include forming a different metal layer by bonding a different metal to a base material made of aluminum or aluminum alloy, or applying V34 hydrocarbon on the base material in advance. There is a method that utilizes a substitution reaction between the base material and the metal halide salt by applying a layer of metal halide salt and heating it at a temperature of 10,000 yen.

However, in the former method, because the purpose is to break only a suitable part of the base material, it is not suitable for mass production, and it is easy to cause electrochemical corrosion between the generated foreign metal layer and the base material. There were drawbacks. In addition, the latter method requires a step of applying adhesive hydrocarbon, and in addition, in the subsequent heating reaction step,
Because it produces hydrocarbon ilU flammable gas and soot,
It complicates the equipment and heating conditions, and it is difficult to completely wash away the soot, aluminum halide, aluminum oxide, etc. that are generated as a result of the substitution reaction between the base material and the metal halide salt, and this residue causes the It has the disadvantage that it tends to corrode the material and cause problems in post-processing.

This invention not only simplifies the process by not using sticky hydrocarbons, but also eliminates the effects of flammable gas and soot emitted from hydrocarbons, and furthermore eliminates the effects of reaction products such as aluminum halide and oxide. The object of the present invention is to provide a method for forming a different metal layer on the surface of a base material made of excellent aluminum or aluminum alloy, which allows aluminum to be completely and easily cleaned and prevents corrosion of the base material. .

An embodiment of the present invention shown in FIGS. 1 and 2 will be described below.

In Figures 1 and 2, (υ is a base material made of aluminum or aluminum alloy, (υ is a solid metal halide salt placed on the surface of the base material,
Qlh indicates a layer of metal after a substitution reaction and a base material reaction after washing, respectively.

That is, the manufacturing process in this example is as follows: First, a solid metal halide salt (2) is placed on the surface of a base material (υ) made of aluminum or an aluminum alloy. Since it easily gets damp due to the moisture inside, it is necessary to move to the next step immediately or proceed with the process in an air-conditioned room.After this, the base material (1) on which the metal halide salt is placed is placed on a heating plate or heated. Heating is carried out in a furnace.This heating temperature is the same as the metal halide salt (2) and the base material (
The temperature is higher than the temperature at which the substitution reaction of υ metal begins, and is close to the melting point of the metal halide salt.In this process, the base material (
The aluminum in 1) reacts with copper chloride, which is a metal halide salt uJ, and turns into aluminum halide. or.

At the same time, a chemical equivalent of copper is precipitated and integrated with the base material (υ). The time required for heating in this step is adjusted depending on the thickness of the amount of copper to be produced.

Through the above steps, aluminum halide and aluminum oxide produced as a result of the substitution reaction, and unreacted metal halide salts adhere to the surface of the base material (1) in a molten state.

If the base material (1) on which ξn and other deposits are formed is allowed to undergo heat radiation cooling as it is, the substances deposited on the base material (1) will solidify and cannot be easily removed.

Requires cleaning process with chemical solution. Therefore, in this example, immediately after the above substitution reaction step, the temperature of the base material (IJ) and the above-mentioned adhered substance was in a low state (i.e.

above the boiling point temperature of the cleaning liquid), and the cleaning liquid (e.g. water)
Cool it quickly by pouring it into the container or pouring cleaning liquid over it. Along with this, the deposits in the molten state are removed from the base material (υ and 1 by the boiling force of the cleaning liquid).
With the strong hydrophilicity of ζ aluminum halide, each of the above-mentioned deposits can be washed off in a short time. The copper layer on the matrix iIJ obtained as in C can then be cleaned without the use of special cleaning chemicals.

Note that although copper chloride is used as the metal halide salt in the above example, other metal halide salts may of course be used.

In the present invention, the base material, aluminum or aluminum alloy, and the metal halide salt are subjected to a substitution reaction, and then the base material, the product of the reaction between the base material and the metal halide salt, and the unreacted In the step of washing the residue with a washing liquid, the base material, the product, and the unreacted residue are washed with n1lIaIF! of the washing liquid. I greater than or equal to L
Mr! Since the product is cleaned by contacting it with the cleaning liquid at L, it not only simplifies the process without using sticky hydrocarbons, but is also free from the effects of flammable gas and soot generated by hydrocarbons. , and further reaction products such as aluminum halide and w aluminum Q!
It has the advantage that it can be completely and easily cleaned, and base metal corrosion is less likely to occur.

[Brief explanation of the drawing]

[Figures 1 and 2 are cross-sectional views showing manufacturing steps according to an embodiment of the present invention. In the figure, (1) is the base material, (!) is the metal halide salt, (b) is the base material after the substitution reaction, and (g) is the copper layer after the substitution reaction.
Agent Makoto Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] After the base material aluminum or aluminum alloy is subjected to a substitution reaction with the halogenated gold salt, the base material and nuclear base material are reacted with the IXX rosin metal salt, and the reaction products and unreacted residue are added to a cleaning solution. The aluminum or Method for forming different metals in aluminum alloy 0