JPH0366566A - Surface treatment for aluminum and aluminum alloy - Google Patents

Abstract

PURPOSE:To make the surface of an Al or Al alloy after its surface treatment clean and to form a compact oxide layer by forming a fluid which composes a slurry in an inert fluid to aluminum. CONSTITUTION:Slurry 2 is prepared by inputting into a slurry hopper 1 an inert fluid to Al, and ethyl alcohol, for instance, an ethyl alcohol 21 and a grinding material 6 in adequate quantities, and with their stirring, as occasions demand. This slurry 2 is then pressure-fed. by a compressed air 3. The slurry 2 transferred by this compressed air 3 is mixed with the compressed air 3 by a nozzle 5, injected to the surface of the Al or Al alloy material which is the body to be ground to grind and clean the surface of the body to be ground physically. In this case, the ehtyl alcohol 21 which is an inert fluid to Al is used and no water of strong corrosivity is used, so, the surface of Al or Al alloy material of the body to be ground is covered by a compact oxide layer without forming a rough oxide with its reaction with water.

Description

Detailed Description of the Invention "Industrial Application! IF" This invention relates to a method for surface treatment of aluminum and aluminum alloys, and in particular, to a method for treating the surface of aluminum and aluminum alloys, in particular, by applying a slurry composed of a mixture of an abrasive material and a fluid to an injection nozzle section. Aluminum (hereinafter referred to as Al!) or aluminum alloy (hereinafter referred to as AQ gold alloy) is processed by a liquid honing treatment method in which the abrasive material is mixed with compressed air and injected at ) relates to a surface treatment method for aluminum and aluminum alloys for cleaning the surface of materials.

[Prior Art] FIG. 3 is a cross-sectional view showing a conventional liquid honing device described, for example, in "Latest Surface Treatment Technology Overview, Complete Edition of Latest Surface Treatment Technology Overview Editorial Committee."

In the figure, (1) is a slurry hopper, (2) is a slurry made of a mixture of abrasive material such as silica sand and water, and (3) is compressed air for feeding and jetting the slurry (2). , (4) are slurry (2) and compressed air (3)
(5) is a nozzle for spraying the slurry (2) onto the surface to be cleaned such as At2 or AC alloy using compressed air (3), (6) is the above-mentioned abrasive material, (7)
(8) is a conduit for sending compressed air (3) to the nozzle (5).

Next, the operation in this liquid honing method will be explained.

The slurry (2), which is made into a slurry by mixing the abrasive material (6) and water (7) and is conveyed by compressed air (3), is mixed with compressed air (3) in a nozzle (5), This compressed air (3) is injected toward the surface of the object to be ground, which is AQ or 71 alloy material, and the surface of the object to be ground is physically ground and cleaned by the abrasion.

When the workpiece to be ground is AQ or A2 alloy material, A, 12 and AI2 alloys are active in nature, so slurry (2)
The water and oxygen inside create a rough oxide layer on its surface.

Ai! is generally performed using a liquid honing device! and A
In the case of cleaning the i7 alloy, the water and oxygen in the slurry (2) can be used to clean A12 or A, f) as described above.
The alloy material forms a rough oxide layer on its surface.

On the other hand, what is shown in FIG. 4 is a sectional view showing the conventional blasting device shown in the above-mentioned document.

In the figure, code (11) is an abrasive hopper, (12)
is an abrasive material such as crow beads, (13) is an abrasive material (t2
), (15) is a pressure hose for feeding abrasive material (1
2) together with compressed air (13) onto the surface of the /l or A2 alloy material that is the material to be ground.

Next, the operation according to this blasting method will be explained.

The abrasive material (12) conveyed by compressed air (13) is
It is sprayed from the nozzle (15) onto the surface of the At2 or A12 alloy material to be ground, and the surface of the material to be ground is physically ground and cleaned by the abrasion.

The object to be ground is At2 or Ai! For alloys, A12 or A
Due to its active nature, the I2 alloy produces a rough oxide layer on its surface when exposed to humid oxygen in the general atmosphere.

When using the blast method using compressed air in the atmosphere, as mentioned above, due to the compressed air and the humidity in the atmosphere,
AC or A2 alloy material forms a rough oxide layer on its surface.

[Problems to be Solved by the Invention] As mentioned above, when cleaning the surface of AQ or A (alloy material, whether by liquid honing method or by blasting method, The surface of conventional cleaned AQ or A2 alloy materials is covered with a rough oxide layer, so it does not adsorb atmospheric moisture or various gases such as Ot, N=, SOx, NOx, etc. Vacuum equipment made of At2 or A12 alloy materials with such surface conditions have the problem that a lot of outgas is generated under vacuum, making it difficult to obtain the desired degree of vacuum. (Conventional surface treatment methods had problems.

This invention was made in order to solve the above-mentioned problems, and provides a surface treatment method for AC and A2 alloy materials that cleans the surface of At7 or A& alloy materials and forms a dense oxide layer. The purpose is to obtain.

[Means for Solving the Problem] In the first invention in which the surface treatment method for Aj and A12 alloy materials according to the present invention is based on liquid honing, a fluid for turning the abrasive material into a slurry is applied to At2. In addition, in the second aspect of the present invention in which blasting is used, the pressure fluid for injecting the abrasive material is an inert fluid with respect to At2.

[Function] The present invention is configured as described above, and the fluid for slurrying and the pressure fluid are inert to At2, and in the liquid honing method, water is not used. Also, since the blasting method does not use humid air, no harmful oxide layer is formed on the surface of the AQ or A17 alloy material, and a dense and stable oxide layer is formed. .

[Example] Hereinafter, the present invention will be explained based on the drawings showing one example thereof.

In addition, codes (1) to (8) (8), (11) (12) (
14) Items indicated by (15) are the same as or equivalent to those indicated by the same reference numerals in the conventional method.

In FIG. 1 showing the implementation procedure of the first invention, the reference numeral (21
> is a fluid inert to A12, such as ethyl alcohol, which is a hot material for slurrying the abrasive material (6), and the ethyl alcohol (21) and the abrasive material (6) are inert to A12.
) to form slurry (2).

Next, the operation of the above embodiment will be explained.

Add an appropriate amount of ethyl alcohol (21) to the slurry hopper (
1) and stir as necessary to make slurry (2). Next, this slurry (2) is pumped with compressed air (3).

The slurry (2) conveyed by the compressed air (3) is mixed with the compressed air (3) at the nozzle (5), and is sprayed onto the surface of the Aff or AQ alloy material that is the object to be ground. Physically grind and clean.

In this case, since ethyl alcohol (21), which is an inert fluid to AQ, is used and highly corrosive water is not used, the surface of the AQ or A5 alloy material to be ground is not exposed to water. It is covered with a dense oxide layer formed by the oxidation of oxygen in the compressed air (3) without reacting to form coarse oxides.

Therefore, the dense oxide layer formed in this way absorbs less gas, and as a result, the amount of outgassing under vacuum is also small, so even ultra-high vacuum equipment made of AQ or A12 alloy materials can be used. , the desired degree of vacuum can be obtained.

Further, in the above embodiment, ethyl alcohol was used as the fluid inert to AQ2 for slurrying the abrasive material (6), but the fluid is not limited to this, and may include methyl alcohol,
In addition, any fluid may be used as long as it is inert to A12, and in that case, the same effects as in the above embodiment can be achieved.

Next, in FIG. 2 showing the implementation procedure of the second invention, reference numeral (
22) is a fluid inert to Al1, such as a dry mixed gas of argon and oxygen, for pumping the abrasive material (12) and injecting it from the nozzle (15).

Note that (23) is a container for insulating the object to be ground from the atmosphere, and the object to be ground is put in this container and ground.

Next, the operation of the above embodiment will be explained.

The abrasive material (12) conveyed by the pressurized and dried argon-oxygen mixed gas (22) is transferred from the nozzle (i5) to the container (23).
) is sprayed onto the surface of the workpiece made of AQ2 or A&alloy material, physically grinding and cleaning the surface of the workpiece.

Argon/oxygen mixed gas (22) and this mixed gas (2
Since the container (23) filled with 2) is in a dry state, the surface of the Ae or AI Ay gold material to be ground will not react with moisture and form a rough oxide layer. The oxygen in the mixed gas (22) forms a dense oxide layer, and the surface of the object to be ground is covered with this oxide layer.

Therefore, the dense oxide layer formed in this way is
Gas absorption is also small, and as a result, the amount of outgassing under vacuum is also small, so that a desired degree of vacuum can be obtained even with ultra-high vacuum equipment made of Aff or Aj alloy materials, for example.

In the above embodiment, a mixed gas of argon and oxygen was used as a fluid inert to AQ2 for pressure feeding and injection of the abrasive material (12), but the present invention is not limited to this, and helium may be used instead of argon. , neon, or other inert gas may be used for AQ, and in that case, the same effects as in the above embodiments can be achieved.

[Effects of the Invention] As described above, according to the present invention, in the first invention, water that is inert to AQ2 is produced without using highly corrosive water to form a slurry of the abrasive. In addition, in the second invention, AQ
Since a fluid that is inert to 2 is used, the surface of A12 alloy material after surface treatment is cleaned and a dense oxide layer is formed, so that gas As a result, even when used in vacuum equipment, it is possible to obtain a surface treatment method for aluminum and aluminum alloys that does not generate outgas.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing a liquid honing method according to one embodiment of the first invention of the present invention, FIG. 2 is a structural diagram showing a blasting method according to one embodiment of the second invention of the present invention, and FIG. A by conventional liquid honing method
Q. A block diagram of a surface treatment method for A12 alloy material. Figure 4 shows a block diagram of a surface treatment method for A12 alloy material using a conventional blasting method. (2)...Slurry, (3)... Compressed air, (5)...
Nozzle, (6) (12)...Abrasive material, (21)...Inert fluid (ethyl alcohol), (22)...Inert fluid (argon/oxygen mixed gas). In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1: Display of fraud case Patent Application No. 1-199492 Name of the invention Relationship to the case involving persons who correct surface treatment methods for aluminum and aluminum alloys Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Title <601) Mitsubishi Electric Corporation Representative Moriya Shiki

Claims (2)

[Claims] (1) Cleaning the surface of aluminum or aluminum alloy material using a liquid honing treatment method in which a slurry composed of abrasive material and fluid is mixed with compressed air and sprayed at a spray nozzle. A method for surface treatment of aluminum and aluminum alloys, wherein the fluid constituting the slurry in the method for surface treatment of aluminum and aluminum alloys is an inert fluid for aluminum. (2) In the surface treatment method for aluminum and aluminum alloys, in which the surface of aluminum or aluminum alloy material is cleaned by a blast treatment method in which abrasive material is injected with a pressure fluid, the above-mentioned pressurized fluid is an inert fluid for aluminum. Characteristic surface treatment method for aluminum and aluminum alloys.