JPH09302485A - Rust-proof treatment device for copper or copper alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rust-proof treatment device which is capably of solving problems which a conventional in-vacuum container rust-proof treatment technique for copper possesses, and executing the rust-proof treatment of copper or copper alloys at high productivity and a low cost as compared with the case of using this rust-proof treatment technique. SOLUTION: A hot air-generating means 1 for generating a hot air having a temperature of 30 to 100 deg.C and a relative humidity of <=30%, an blasting means 3 for sending the hot air from this means, and a solid-like benzotriazole are disposed. Then, a container 5, which the hot air is sent via a piping by means of the air-sending means, brings benzotriazole into contact with the hot air and generates the sublimated gas thereof, and a rust-preventing vessel 8, which is connected with pipes and has nozzles for blowing the hot air contng. the sublimated gas of benzotriazole generated in the container to the surface of the copper or copper alloy, are provided. The rust-preventing vessel is connected with the pipes to the hot air-generating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for anticorrosion treatment of copper or a copper alloy, and more particularly to a technical field of an apparatus used for anticorrosion treatment of copper or a copper alloy with a sublimation gas of benzotriazole.

[0002]

2. Description of the Related Art Triazoles such as benzotriazole (BTA) and tritriazole (TTA), thiazoles, imidazoles, diols and mercaptans are used as main rust inhibitors for copper or copper alloys. There is.

However, among the copper or copper alloys that have been rust-proofed with such a main rust preventive agent, particularly plate-shaped copper or copper alloys (that is, copper or copper alloy strips) are slitted or slitted by a slitter. The rust preventive film is removed by rubbing during slitting or width cutting, and discoloration occurs from that part.

For example, a slitter line has a width accuracy of ± 0.
In order to make it 03 mm, it is necessary to use fingers with strong binding force, in which case the rust preventive coating is relatively easy to remove, the amount of rust preventive agent attached is reduced, and analysis by ESCA (X-ray photoelectron spectroscopy) In the case of the N / Cu peak intensity ratio (N is nitrogen) of 0.18 in front of the slit, 0.08 is 0.08, and the rust preventive effect is drastically reduced, and discoloration occurs. Here, the N / Cu peak intensity ratio is the N in the rust preventive agent adhered to the Cu of the base material with respect to the Cu of the base material when the peak intensity of Cu of the base material is 1 (Cu of the base material). It is the ratio of the peak strength of the rust preventive agent adhering to N as N).

The main rust preventive agent is dissolved in an aqueous solution or an organic solvent, and the solution thus obtained is applied to the material to be treated, or the material to be treated is immersed in the solution. Although rust treatment is performed, there are the following problems in this rust prevention treatment.

That is, in the treatment using the main rust preventive dissolved in an aqueous solution (aqueous solution treatment), the aqueous solution is excellent in safety,
In addition, it is used for the treatment of high quality products because it can reliably prevent rust. However, in the aqueous solution treatment, a pretreatment and a post-drying process are indispensable, which causes a problem that the treatment line becomes long. In addition, since there is an effect of accelerating discoloration due to moisture in the aqueous solution treatment, there is a problem that when a high humidity portion is generated by such moisture, discoloration is preferentially started from that portion.

The treatment using an organic solvent in which the main rust preventive is dissolved (organic solvent treatment) has the advantage that the treatment line is shorter than in the case of the aqueous solution treatment and the humidity does not increase. However, since organic solvents are toxic and flammable, there are safety problems. Further, recently, the destruction of the ozone layer by an organic solvent has become a problem, and the regulations on the use of the organic solvent have been tightened, making it difficult to use the organic solvent.

As a technique for improving these drawbacks, a technique for holding an annealed copper-based coil in a vacuum vessel and performing an anticorrosion treatment with dry air or gas containing a vaporizable anticorrosive agent (hereinafter referred to as "in a vacuum vessel") Anticorrosion treatment technology) has been proposed and described in Japanese Patent Publication No. 63-67548. However, this technique for rust preventive treatment in a vacuum container has a problem in that productivity is lowered because the copper-based coil needs to be held in another container called a vacuum container. In addition, the rust-preventive gas is introduced into the narrow gap of the copper-based coil to create a vacuum state for rust-prevention treatment, but it is costly depending on the vacuum state and the use of gas when used. There is a problem that is high.

On the other hand, there is also a method of impregnating a volatile anticorrosive agent into a packing paper or putting it in a packing container as a solid and using it at room temperature. However, this method requires a long treatment time (the time until the rust preventive effect is obtained), and therefore discoloration may occur before the rust preventive effect is obtained. However, there is a problem that discoloration occurs depending on the location.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object thereof is to shorten a processing line and shorten a narrow space without causing a decrease in productivity and an increase in cost. It is possible to safely and safely perform anticorrosion treatment of copper or a copper alloy in time, and to form an anticorrosion coating that is unlikely to cause discoloration. Particularly, in the slitter line of copper or copper alloy strips, it is possible to prevent discoloration from occurring. An object of the present invention is to provide a copper or copper alloy rust preventive treatment device capable of forming a rust film. That is, the problem of the rust preventive treatment technology in the vacuum container is solved, and rust preventive treatment capable of performing rust preventive treatment of copper or copper alloy at high productivity and at low cost as compared with the case of this rust preventive treatment technology. It is intended to provide a processing device.

[0011]

In order to achieve the above object, the present invention provides a copper or copper alloy rust preventive treatment device having the following constitution. That is, the copper or copper alloy anticorrosion treatment apparatus according to the present invention, the temperature: 30 ~ 100 ℃, relative humidity: 30% or less hot air generating means for generating hot air, and the hot air generating means for blowing hot air Means and a solid benzotriazole are arranged, hot air is blown through the pipe by the blowing means, a container for generating a sublimation gas of benzotriazole by bringing the hot air and benzotriazole into contact with each other, and a pipe for the container And a rust preventive tank having a nozzle for blowing hot air containing sublimation gas of benzotriazole generated in the container onto the surface of copper or a copper alloy, and the rust preventive tank and the hot air generating means are connected by a pipe. It is a rust preventive treatment device for copper or copper alloy.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The anticorrosion treatment apparatus for copper or copper alloy according to the present invention can be manufactured, for example, as follows, and can be used for anticorrosion treatment for copper or copper alloy.

A blowing means such as a blower is connected to a hot air generating means such as a hot air generator via a pipe. A container (a container for generating a sublimation gas of benzotriazole) is connected to the hot air generating means via a pipe. For this container,
The nozzle portion of the rust preventive tank having a nozzle is connected through a pipe. This rust preventive tank and the hot air generating means are connected via a pipe. Then, a temperature controller is connected to the hot air generating means, and a thermometer for measuring the temperature inside the rust preventive tank is arranged.
Thereafter, solid benzotriazole is placed in the container. Copper or a copper alloy as a material to be treated is placed in the rustproof tank. At this time, when the material to be treated is copper or a copper alloy having a size that can be put in the rustproof tank, the material to be treated is placed in the rustproof tank. If the material to be treated is copper or a copper alloy strip, provide slits on the opposite sides of the rustproof tank with slits on the side of the strip and slits on the side of the strip, and insert the tip of the strip from the slot into the rustproof tank. Insert it, pull it out a little from the exit slit, and place the material to be processed. The sublimation temperature of benzotriazole is
20 ° C.

Next, the hot air generating means causes a temperature of 30 to
Generates hot air at 100 ℃ and relative humidity: 30% or less, and operates the air blower. At this time, the temperature of the hot air is adjusted to a predetermined temperature T _A between 30 ° C and 100 ° C by the temperature controller, so that the temperature inside the rust preventive tank is 30-100 ° C.
The temperature is set to a predetermined temperature T _B between ° C.

Then, hot air having a temperature T _A and a relative humidity of 30% or less is blown into the container through the pipe and comes into contact with benzotriazole (sublimation temperature: 20 ° C.), thereby sublimating gas of benzotriazole. Occurs. Then, the hot air containing the sublimation gas of benzotriazole generated in this container is jetted from the nozzle of the rustproof tank into the rustproof tank through the pipe, and is sprayed on the surface of the copper or copper alloy to be treated. Then, this hot air (excess hot air after spraying) is blown from the rust preventive tank to the hot air generating means through a pipe, where it is adjusted to a predetermined temperature T _A , is blown into the container, and the inside of the rust preventive tank is supplied. Gushes into. In this way, the hot air is blown from the hot air generating means to the container and the rustproof tank, returns to the hot air generating means and circulates.

At this time, when the material to be treated is copper or a copper alloy strip, the material to be treated is run at a predetermined speed. Then
The surface of the running copper or copper alloy strip is continuously blown with hot air containing a sublimation gas of benzotriazole, whereby the rustproofing treatment of the copper or copper alloy strip is continuously performed.

As can be seen from the embodiments of the present invention as described above, the copper or copper alloy anticorrosion treatment apparatus according to the present invention solves the problems of the anticorrosion treatment technique in the vacuum container. As a result, as compared with the case of the rustproofing technique, it becomes possible to carry out rustproofing of copper or copper alloy with high productivity and at low cost.

That is, in the rust preventive treatment technique in the vacuum container, as described above, the copper strip coil is held in the vacuum container, and the rust preventive gas is introduced into the narrow gap of the coil for the rust preventive treatment. Therefore, the productivity is low and the cost is high.

On the other hand, the anticorrosion treatment apparatus for copper or copper alloy according to the present invention is, as described above, a hot air generating means for generating hot air at a temperature of 30 to 100 ° C. and a relative humidity of 30% or less, and Blower means for blowing hot air from the hot air generating means, solid benzotriazole is arranged, hot air is blown through the pipe by the air blowing means, and the hot air and benzotriazole are brought into contact with each other to sublimate benzotriazole gas. A container for generating and a rust preventive tank which is connected to the container by a pipe and has a nozzle for blowing hot air containing sublimation gas of benzotriazole generated in the container onto the surface of copper or a copper alloy, the rust preventive tank and the above The hot air generating means is connected by a pipe. Therefore, temperature: 30 ~ 100 ℃ by this hot air generating means, while generating a relative humidity: 30% or less hot air, when the air blowing means is operated, this hot air is blown into the container, and contacted with benzotriazole, Thereby, a sublimation gas of benzotriazole is generated, and hot air containing the sublimation gas of benzotriazole is ejected from the nozzle of the anticorrosion tank into the anticorrosion tank through the pipe, and copper or copper as the material to be treated is ejected. Spray on the surface of the alloy,
Thereby, the rustproofing treatment of copper or copper alloy can be performed. At this time, when the material to be treated is copper or a copper alloy strip, when it is run at a predetermined speed, hot air containing a sublimation gas of benzotriazole is continuously blown onto the surface of the running copper or copper alloy strip, Thereby, the anticorrosion treatment of the copper or copper alloy strip can be continuously performed.

According to the copper or copper alloy anticorrosion treatment apparatus of the present invention, the copper or copper alloy anticorrosion treatment can be performed in this manner. The productivity is high and the cost is low as compared with the rust prevention treatment in the vacuum container as in the case of. Therefore, according to the anticorrosion treatment apparatus for copper or copper alloy according to the present invention, as compared with the case of the anticorrosion treatment technology in the vacuum container, the anticorrosion treatment of copper or copper alloy at high productivity and low cost Will be able to do it.

The means for generating the hot air having a temperature of 30 to 100 ° C. and a relative humidity of 30% or less is
Temperature and relative humidity in the rustproof tank, that is, the temperature of hot air containing sublimation gas of benzotriazole sprayed on the surface of copper or copper alloy in the rustproof tank (hereinafter referred to as rustproofing temperature)
And relative humidity (hereinafter referred to as rust prevention humidity),
This is because the temperature is 0 ° C. and 30% or less. Here, the rust-prevention treatment temperature is set to 30 to 100 ° C. When the temperature is lower than 30 ° C., the rust-prevention speed is slow, the rust-prevention treatment takes a long time, and the productivity is lowered. If it is set to benzotriazole, decomposition and deterioration of benzotriazole may occur, and rust prevention performance may be deteriorated. Further, sublimation of benzotriazole in the container (a container for generating sublimation gas of benzotriazole) may be controlled (sublimation gas of benzotriazole). This is because it becomes impossible to control the generation amount of), and it becomes difficult to control the rust prevention rate and productivity at a constant level. The rust prevention treatment humidity is set to 30% or less, which means that the water content on the surface of the copper or copper alloy that is the material to be treated can be removed, but if it exceeds 30%, the copper or copper alloy that is the material to be treated can be removed. Condensation occurs on the surface,
This is because discoloration occurs.

As can be seen from the embodiment of the present invention, hot air is blown from the hot air generating means to the container and the rust preventive tank, and returns to the hot air generating means for circulation. That is, the rust preventive treatment apparatus for copper or copper alloy according to the present invention, the hot air generating means, the container, so that the hot air circulates in this way,
Pipes are connected between the rustproof tanks to create a circulation structure. The reason for this is to prevent the hot air containing the sublimation gas of benzotriazole from leaking to the outside and to effectively utilize it without circulating it and discarding it. Here, to prevent the hot air from leaking to the outside, if the hot air leaks to the outside, not only the consumption of the benzotriazole is accelerated, but also the temperature change of the hot air becomes large, and the benzotriazole on the surface of the copper or copper alloy is prevented. This is because the amount of triazole attached is not stabilized and the working environment becomes worse.

In the container, solid benzotriazole (sublimation temperature: 20 ° C.) is brought into contact with hot air having a temperature of 30 to 100 ° C. and a relative humidity of 30% or less to heat the benzotriazole sublimation gas. Although it occurs, there is no problem that this heating causes an explosion. That is, conventionally, it was also reported that benzotriazole exploded during its vacuum distillation, and it was considered dangerous to heat benzotriazole. Considering the practical application of anticorrosion treatment for copper alloys, we have conducted extensive research into anticorrosion methods and anticorrosion equipment, and as a result, we have found that benzotriazole does not explode when heated at temperatures below 100 ° C and can be used safely. I found out. Therefore, there is no problem that an explosion occurs when the solid benzotriazole is heated by the hot air of 30 to 100 ° C. In other words, the present invention has been completed based on the findings obtained from such research.

By the way, it is considered that benzotriazole chemically reacts with copper on the surface of the material to be treated (copper or copper alloy) and forms a chelate compound layer to cover the material to be treated.
The chelate compound layer has a water-repellent effect, acts as a rust preventive film, and prevents copper from being oxidized and discolored.

Although powdery benzotriazole is commercially available, it is difficult to control the amount of benzotriazole consumed when powdered is blown with hot air. From this point of view, it is desirable to use a lump-shaped benzotriazole to be placed in the container, and further to use a lump-shaped benzotriazole having a large area. Such a lump can be obtained, for example, by melting a powder and then cooling it.

According to the device according to the invention, the temperature: 30 to 10
Hot air containing a sublimation gas of benzotriazole at 0 ° C. is blown onto the surface of copper or copper alloy from a nozzle. At this time, it is desirable to blow it from a distance of 150 mm or less with a wind pressure of 100 mmAq or more. Then, the N / Cu peak intensity ratio becomes 0.1 or more, and it becomes possible to more reliably perform copper or copper alloy rust prevention treatment with high productivity and low cost.

The nozzle is provided so that its spraying direction is perpendicular to the surface of the copper or copper alloy strip, and the strip (plate) is provided.
It is desirable to change the nozzle groove width so that the amount of hot air blown to the central portion increases. This is because the amount of benzotriazole attached to the copper strip can be made uniform, and by increasing the amount of benzotriazole in the central portion where discoloration is likely to occur, it is possible to obtain a copper strip that is less likely to discolor.

The heating temperature of the benzotriazole is 100
In order not to exceed ℃, it is advisable to install a temperature sensor in the hot air generating means or the nozzle so that the heating stops when the heating temperature exceeds 100 ℃.

[0029]

EXAMPLE FIG. 1 shows a rust preventive treatment apparatus according to an example of the present invention. This rust preventive treatment device was manufactured as follows. That is, a hot air generator [3200-8C-025YE, manufactured by Taketsuna Seisakusho Co., Ltd.] 1 is prepared as a hot air generator, and a blower 3 is connected to this hot air generator 1 as a blower via a pipe 2.
A container 5 is connected to the hot air generator 1 via a pipe 4.
A nozzle portion 7 of a rust preventive tank 8 having a nozzle 7 is connected to this container 5 via a pipe 6. The rust preventive tank 8 and the hot air generator 1 are connected via a pipe 9. A thermometer T ₁ for measuring the internal temperature of the hot air generator 1 and a thermometer T ₃ for measuring the internal temperature of the rustproof tank 8 are provided, and these thermometers T ₁ , T ₃ and the temperature controller are provided. Connect 10 A thermometer T ₂ for measuring the temperature inside the pipe 6 is arranged near the container 5. In addition, on the opposite side surfaces of the rust preventive tank 8, there are provided slits on the inlet side S ₁ and slits on the outlet side S ₂ , and a door for inserting a short material to be processed is provided on the other side surface (not shown). Not). Pipe 2 has damper D ₁ and pipe 6
A damper D ₂ is installed on this. An anemometer P ₁ is provided near the nozzle of the pipe 6.

On the other hand, a commercially available powdery benzotriazole was heated in an oven at about 100 ° C. to be melted and then cooled to obtain a lumpy benzotriazole having a surface area of 400 cm ² . Then, this benzotriazole was placed inside the container 5.

Using the rust preventive treatment apparatus according to the example thus manufactured, two types of rust preventive treatments (Examples 1 and 2) were performed as follows.

(Embodiment 1) The entrance side slit S ₁ and the exit side slit S _{2 of the} strip of the rust preventive tank 8 of the rust preventive treatment apparatus according to the above embodiment.
Was sealed with a soft resin, a copper alloy strip having a shorter length than the short door for inserting the material to be treated in the rust preventive tank 8 was inserted and arranged in the rust preventive tank 8, and the door was tightened.

Next, the hot air generator 1 of the rust preventive treatment apparatus is operated to generate hot air having a temperature of 80 ° C. and a relative humidity of 0%, and the blower 3 is operated. Then the temperature: 80
Hot air having a temperature of 0 ° C. and a relative humidity of 0% is blown into the container 5 through the pipe 4 and comes into contact with the lumped benzotriazole (surface area: 400 cm ² ) in the container 5, whereby a sublimation gas of benzotriazole is generated. To do. The hot air containing the sublimation gas of benzotriazole generated in the container 5 is supplied to the pipe 6
Through the nozzle 7 into the rustproof tank 8 and is sprayed onto the surface of the short copper alloy strip as the material to be treated, whereby the short copper alloy strip is rustproofed. At this time, the distance between the nozzle opening at the tip of the nozzle 7 and the short copper alloy strip is
The air pressure of the hot air blown onto the 100 mm short copper alloy strip is 150 mmA.
The hot air was blown onto the short copper alloy strip for 1 second. The temperature of the hot air blown into the rustproof tank 8 was 80 ° C., the relative humidity was 0%, and the concentration of the sublimation gas of benzotriazole in this hot air was 0.01% by volume.

With respect to the above-mentioned rustproof short copper alloy strip, a sulfurous acid gas test (a temperature of 40 ° C., a test of leaving it exposed to an atmosphere of sulfur dioxide of 10 ppm for 5 hours) and a constant temperature and humidity test (temperature 40 A test was conducted in which the sample was left to stand in an atmosphere of 80 ° C and 80% humidity for 10 days. As a result, no discoloration was observed in these tests, and it was confirmed that the effect of the above-mentioned rustproofing treatment was good.

(Example 2) First, the rust preventive treatment apparatus according to the above example was installed on the winding side of the slitter line of a copper alloy strip.

Next, the hot air generator 1 of the rust preventive treatment apparatus is operated to generate hot air having a temperature of 80 ° C. and a relative humidity of 0%, and the blower 3 is operated. Then the temperature: 80
Hot air having a temperature of 0 ° C. and a relative humidity of 0% is blown into the container 5 through the pipe 4 and comes into contact with the lumped benzotriazole (surface area: initially 400 cm ² ) in the container 5, whereby the sublimated gas of benzotriazole is generated. appear. The hot air containing the sublimation gas of benzotriazole generated in the container 5 is jetted from the nozzle 7 into the rustproof tank 8 through the pipe 6. still,
The temperature of the hot air jetted into the rustproof tank 8 is 80 ° C., the relative humidity is 0%, and the concentration of the sublimation gas of benzotriazole in the hot air is 0.01% by volume. The nozzle opening at the tip of the nozzle 7 was positioned so that the distance between the nozzle opening and a copper alloy strip described later was 100 mm. The wind pressure of the hot air blown into the rustproof tank 8 was set to 150 mmAq.

On the other hand, the copper alloy strip slit in the slitter line is run in the direction from the inlet slit S ₁ to the outlet slit S ₂ of the strip of the rustproof tank 8 of the rustproofing apparatus. That is, the copper alloy strip is applied to the rust preventive tank 8 of the rust preventive treatment device.
Inserted into the anticorrosion tank 8 from the slit S ₁ on the inlet side of the strip and ejected from the slit S ₂ on the outlet side at a predetermined constant speed (40 m /
Minutes).

Then, the hot air containing the sublimation gas of benzotriazole ejected from the nozzle 7 into the rust preventive tank 8 is blown onto the surface of the running copper alloy strip, whereby the copper alloy strip is rust-proofed. It Then, this hot air (excess hot air after spraying) is blown from the rust preventive tank 8 to the hot air generator 1 through the pipe 9, where the temperature is adjusted to 70 ° C. and the relative humidity is adjusted to 0%. Blown to the rust prevention tank 8
Spouts in. In this way, the hot air is blown from the hot air generator 1 to the container 5 and the rustproof tank 8, returns to the hot air generator 1 and circulates.

Anticorrosion treatment was continuously performed while running the copper alloy strip slit in this way. as a result,
It was confirmed that the rustproofing treatment of the copper alloy strip could be continuously and easily performed, the productivity of the rustproofing treatment was high, and the cost was low.

On the other hand, a copper alloy strip before being applied to the slitter line (those subjected to ordinary rust prevention treatment, that is,
After degreasing and cleaning the copper alloy strip, dipping it in a commercially available anticorrosion, and then drying), the copper alloy strip after slitting in a slitter line, and the copper alloy strip after the continuous anticorrosion treatment, the surface N / Cu by analyzing the amount of rust preventive agent adhered by ESCA
It was determined as the peak intensity ratio. The analysis results are shown in Tables 1 and 2.
Shown in Table 1 shows the analysis results on the front side of the copper alloy strip, and Table 2 shows the analysis results on the back side.

As can be seen from Tables 1 and 2, the copper alloy strip after slitting in the slitter line has a low N / Cu peak strength ratio and a small amount of rust preventive agent. This is because the rust preventive agent peeled off on the slitter line. On the other hand, the copper alloy strip after the continuous rust-proofing treatment has a high N / Cu peak strength ratio and a large amount of the rust-preventive agent attached, and the copper alloy strip before the rust-preventing agent is applied to the slitter line is It has recovered to the adhesion level.

It was confirmed that the copper alloy strip after the continuous anticorrosion treatment had no problem in practical use and did not cause discoloration even after being shipped to the market.

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

EFFECT OF THE INVENTION According to the anticorrosion treatment apparatus for copper or copper alloys of the present invention, the treatment line is short, the space is short, and the safety is high, without lowering the productivity and increasing the cost. , Copper or copper alloy can be rust-proofed, can produce a rust-resistant coating that is unlikely to cause discoloration, especially in a slitter line of copper or copper alloy strip become. That is, as compared with the case of the conventional rust preventive treatment technology in a vacuum container, it becomes possible to perform rust preventive treatment of copper or a copper alloy with high productivity and at low cost.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a rust preventive processing apparatus according to an embodiment.

[Explanation of symbols]

1--Hot air generator, 2--Piping, 3--Blower, 4--Piping,
5--Container, 6--Piping, 7--Nozzle, 8--Rustproof tank, 9--Piping, 10--Temperature controller, T ₁ , T ₂ , T ₃ --Thermometer, S _1- -Slit entry slit, S ₂ --Strid exit slit, D ₁ , D ₂ --Damper, P ₁ --Anemometer.

Claims (1)

[Claims] 1. A hot air generating means for generating hot air having a temperature of 30 to 100 ° C. and a relative humidity of 30% or less, a blowing means for blowing hot air from the hot air generating means, and a solid benzotriazole are arranged, Hot air is blown through the pipe by the air blowing means, a container for contacting the hot air and benzotriazole to generate a sublimation gas of benzotriazole, and a pipe connected to the container, sublimation of benzotriazole generated in the container A rust preventive tank having a nozzle that blows hot air containing gas onto the surface of copper or a copper alloy, and the rust preventive tank and the hot air generating means are pipe-connected to prevent copper or a copper alloy. Rust processing equipment.