JPH02129388A - Rustproofing treatment of copper and copper alloy and equipment thereof - Google Patents

Abstract

PURPOSE:To thickly form a rustproof layer and to keep rustproof effect in a range over a long time by utilizing a benzotriazole-based rust preventive to perform rustproof treatment on the surface of copper or copper alloy and thereafter furthermore performing rustproof treatment with a mercaptan-based rust preventive. CONSTITUTION:A benzotriazole-based rust preventive is utilized to perform rustproof treatment on the surface of copper or copper alloy. Thereafter furthermore rustproof treatment is performed by utilizing a mercaptan-based rust preventive. Thereby a rustproof layer combining the characteristics of both rustproof preventives can be thickly formed. Therefore even when copper or copper alloy whose surface is treated by the rustproof preventives is allowed to stand for a long time in the atmosphere under the extremely bad conditions such as high temp. and much moisture, discoloring is not caused and rustproof effect is kept in a range over a long time.

Description

[Detailed description of the invention]

(Industrial Application Field 1) The present invention relates to a rust prevention treatment method for copper and copper alloys, and an apparatus therefor, which is particularly capable of forming a thick rust prevention layer and lasting a long time in an atmosphere of extreme conditions such as high temperature and humidity. The present invention relates to a rust-preventive treatment method for copper and copper alloys that can perform rust-preventive treatment that can sufficiently maintain the rust-preventing effect over a long period of time without causing discoloration even after a period of time, and an apparatus therefor.

[Conventional technology]

Generally, there are a wide variety of products using copper and copper alloys. There are too many specific examples to list, but typical examples that are familiar to us include electric wires and conduits. Rust prevention treatment for products using copper and copper alloys is as follows:
Although there are some differences depending on the target product, the basic rust prevention treatment is the same, so here we will explain using electric wire as an example. The surface of the core of the electric wire used in power transmission lines is treated to prevent rust in order to maintain a specified service life. As this rust preventive liquid, conventionally, rust preventives such as BTA (benzotriazole), 1.1.1 trichloroethane, IPA (isoprobanol), and M
E K (Methyl ethyl, Keto
A benzotriazole type (BT type) compound dissolved in a mixed solvent such as ne) or Methane 1 is used. Other rust preventive liquids include mercaptan-based (R3H-based) liquids based on mercaptan (R2O) and appropriately diluted with alcohol or solvent. Conventional methods for applying these anti-rust solutions to copper wires include applying the anti-rust solution to the conductor as it runs through using a shower, and applying the anti-rust solution to fibers such as felt impregnated with the anti-rust solution. Methods used include a method in which the conductor is passed through and coated with a rust preventive liquid, and a method in which the conductor is immersed in a liquid tank filled with the rust preventive liquid and passed through and coated with the rust preventive liquid. [Problems to be Solved by the Invention] As described above, copper wires that have been subjected to rust prevention treatment using a benzotriazole-based (BT-based) rust inhibitor, and mercaptan-based (
A test was conducted to confirm the effectiveness of the rust prevention treatment for each copper wire treated with a rust prevention agent (RS II-I series).
Let's verify the results. Each test item and test conditions are as follows. That is, the test items are Na, S test, patina generation test,
There are three red discoloration tests. The Na2S test is a test to confirm whether the anticorrosion film is uniform and can withstand a corrosive environment.It is immersed in a 100ppm Na2S solution for 30 seconds and the degree of discoloration is observed. If discoloration occurs on the surface of the copper wire in this Na, S test, it indicates that the effect of the antirust treatment is not sufficient. In addition, the patina generation test is a test that assumes that moisture has penetrated into the overhead wire, and it is left in an atmosphere with a temperature of 60°C and a humidity of 80% for 24 hours to check whether or not patina occurs. look. If a patina develops on the surface of the copper wire in this atmosphere, it indicates that the rust prevention treatment is not sufficiently effective. In addition, the red discoloration test was conducted at a temperature of 60
Leave the copper wire in the air held in the C for 240 hours and check the degree of red color change.If the surface of the copper wire changes color in this red color test, it indicates that the rust prevention treatment is not effective enough. The results of the confirmation test for the rust prevention treatment effect regarding the above test items are shown in Table 1. However, in Table 1, 1b, 2a, and 1a are ASTM C○PPER.
By C0RRO8ION 5TANDARD. As is clear from the results in Table 1, when conventional copper wire is treated with a benzotriazole-based (BT-based) rust preventive agent or a mercaptan-based (R8H-based) anti-rust agent, Different results have been obtained for each case of anti-corrosion treatment using a chemical agent. In other words, when rust prevention treatment is performed using a mercaptan-based (RSH-based) rust inhibitor, no discoloration occurs in the Na2S test, and no patina is observed in the patina generation test, but benzotriazole-based When a rust preventive treatment is performed using a (BT-based) rust preventive agent, discoloration occurs in the Na and S tests, and patina is observed in the patina test. In addition, in the red discoloration test, no discoloration was observed when rust preventive treatment was performed using a benzotriazole-based (BT-based) rust inhibitor, but when a mercaptan-based (R8H-based) rust preventive was used, When anti-corrosion treatment is applied, discoloration is observed. As described above, the problem is that a good rust prevention treatment effect cannot be obtained even when applying either a benzotriazole-based (BT-based) rust preventive agent or a mercaptan-based (R3H-based) rust preventive agent. have. The present invention provides a rust preventive layer that can be formed thickly and maintains its rust preventive effect for a long period of time without causing discoloration even when left in an atmosphere with extreme conditions such as high temperature and humidity for a long time. Rust prevention treatment method for copper and copper alloys that can be rust treated;
The purpose of the invention is to provide a device for the same. (Means for Solving the Problems 1) In order to achieve the second objective, in the method for rust-preventing copper and copper alloys of the present invention, a benzotriazole-based rust preventive agent is used on the surface of copper or copper alloys. After the rust-preventing treatment, a mercaptan-based rust preventive agent is used to perform the rust-preventing treatment.Furthermore, in order to achieve the above object, in the method for rust-preventing copper and copper alloys of the present invention, , in a rust prevention treatment method for copper and copper alloys, in which rust prevention treatment is performed in two or more steps when copper or copper alloy is manufactured into a product through multiple steps, of the two or more rust prevention treatment steps, The rust prevention treatment in the first step is performed with a benzotriazole-based rust preventive agent, and the rust prevention treatment in the final step is performed with a mercaptan-based rust preventive agent.Furthermore, in order to achieve the above object, the present invention In the rust prevention treatment equipment for copper and copper alloys, a copper or copper alloy single wire formed to a desired wire diameter by a wire drawing machine is immersed and run in a rust prevention tank filled with a benzotriazole rust preventive solution. The copper or copper alloy single wire is subjected to rust prevention treatment, and the stranded wire formed by twisting and forming two or more of the single wires is immersed and run in a rust prevention tank filled with a mercaptan rust preventive solution. Furthermore, in order to achieve the above object, the copper and copper alloy rust prevention treatment apparatus of the present invention uses copper or copper that has been formed into a desired wire diameter by a wire drawing machine. The copper or copper alloy single wire is subjected to rust prevention treatment by running it immersed in a rust preventive tank filled with a benzotriazole-based rust preventive solution.
A primary stranded wire formed by twisting and forming two or more strands is immersed and run in a rust prevention tank filled with a mercaptan-based rust preventive solution to apply rust prevention treatment to the primary strand, and the two primary strands are The secondary stranded wire formed by twisting and forming the wire as described above is immersed and run in a rust prevention tank filled with a mercaptan-based rust preventive solution to apply rust prevention treatment to the secondary stranded wire. [Effect 1: Since the surface of copper or copper alloy is treated with a benzotriazole-based rust preventive agent and then treated with a mercaptan-based rust preventive agent, the benzotriazole-based rust preventive agent It is possible to combine the advantages of anti-rust treatment with mercaptan-based anti-rust agents and the anti-rust effects of mercaptan-based anti-rust agents, and to form a thick anti-rust layer with a double structure.
Even if it is left in an atmosphere under extreme conditions such as high temperature and humidity for a long time, it will not discolor and will retain its rust prevention effect for a long time. In addition, when producing a product using copper or copper alloy as a material and applying rust prevention treatment in two or more steps, the rust prevention treatment in the first step is performed with a benzotriazole-based rust preventive agent, and the final product is Since the rust prevention treatment in the process is performed using a mercaptan rust preventive agent, a rust preventive layer is formed using a benzo-1-lyazole rust preventive agent on the inside, and a rust preventive layer is formed using a mercaptan rust preventive agent on the outside. , the anti-rust layer can be formed thickly into a double structure, and the anti-rust effect is maintained for a long time without causing discoloration even if left in harsh conditions such as high temperature and humidity for a long time. be able to. Furthermore, the copper or copper alloy single wire formed into the desired wire diameter by a wire drawing machine is immersed and run in a rust prevention tank filled with a benzotriazole-based rust preventive solution, and the copper or copper alloy single wire is subjected to rust prevention treatment. This is because the stranded wire, which is formed by twisting two or more of the single wires and forming the wire, is immersed and run in a rust prevention tank filled with a mercaptan-based rust preventive solution, thereby applying rust prevention treatment to the stranded wire. A rust-preventing layer is formed on the surface of the single wire using a benzotriazole-based rust preventive agent, and a rust-preventing layer using a mercaptan-based rust preventive agent is formed on the surface of the stranded wire, which is expected to provide a double anti-rust effect. Even if it is left in an atmosphere under extreme conditions such as high temperature and high humidity for a long time, it will not discolor and will retain its rust prevention effect for a long time. In addition, when manufacturing a twisted wire by twisting several other wires in addition to the 19 wires, it is manufactured by primary twisting and secondary twisting. In this case, a primary stranded wire is produced by twisting single wires that have been rust-proofed with a benzotriazole-based rust-preventive solution, and then rust-proofed with a mercaptan-based rust-preventive solution. Since the secondary stranded wires are produced by twisting the wires together and then subjected to rust prevention treatment with a mercaptan rust preventive solution, the rust prevention treatment of the stranded wires with the mercaptan rust preventive solution can be made more complete. [Example 1] An example of the present invention will be described below. The copper wire manufacturing apparatus has a configuration as shown in FIG. That is, the copper wire 1 pulled out from the furnace is shown by the arrow A.
The wire is drawn out in the direction shown in FIG. The copper wire 3 which has been drawn into a wire of a desired diameter in the wire drawing machine 2 is pulled by an upstream kettle 4 and sent into a rust prevention treatment device 5. This rust prevention treatment device 5 contains benzotriazole (C, H4), which is a rust preventive agent.
N2N H) solution is inserted. The copper element 11A3 travels within the rust prevention treatment device 5 under the surface of the benzotriazole solution at a linear speed of 600 to 1200 m/hr. For this anti-corrosion treatment, conductors (
Copper strands 3) Rust prevention treatment device 5 filled with rust prevention liquid to prevent rust prevention liquid from adhering to areas on the surface.
The vehicle is driven through a deep position in the rust preventive liquid in the tank. A rust-preventing coating is formed on the surface of the copper wire 3 as it travels through the rust-preventing treatment device 5. The process of forming the anti-rust coating on the surface of the copper wire 3 is based on a first-order chemical action. That is, benzotriazole (CGH,
When the copper wire 3 passes through the N, ・NH) solution, the benzotriazole (C, H, N2 ・NH) and copper (Cu) undergo a chemical reaction → (C9H4Nyo・N)2・Cu+H20. The benzotriazole is converted into cupric benzotriazole ((C6H5N3-) in the presence of oxygen (C2).
N) 2-Cu) is formed, and this cupric benzotriazole forms the rust preventive layer. This benzotriazole cupric ((CcH4N2 ・N) 2 ・Cu
) is extremely heat resistant. For example, even if it is sufficiently dried after being treated with a 1% benzotriazole solution and left in air at 60° C. for 500 hours, no red discoloration will occur. In this way, the copper wire 3 is subjected to rust prevention treatment in the rust prevention treatment device 5, becomes the rust prevention treatment device
It is wound up. In this way, a copper wire subjected to rust prevention treatment is manufactured. FIG. 2 shows a stranded wire manufacturing apparatus. That is, a stranded wire is manufactured using a plurality of rust-proof treated strands 6 which have been subjected to rust-proof treatment in the rust-proof treatment apparatus 5 shown in FIG. The plurality of rust-proof treated strands 6 that have been subjected to rust-proof treatment in the rust-proof treatment device 5 are supplied to stranded wires 8!8. This wire twisting machine 8 twists the drawn-in plurality of rust-proofed copper wires 6 into twisted wires having a desired diameter and thickness. In manufacturing this stranded wire, one of the plurality of rust-proof treated strands 6 is used as a center line, and around this center line, for example, six rust-proof treated strands 6 are arranged and twisted. to produce stranded wire. The copper strands 9 stranded into a strand of a desired diameter in the stranding machine 8 are sent into a rust prevention treatment device 10 . Before being fed into the rust prevention treatment apparatus 10, it is necessary that the rust preventive agent applied to the surface of the copper strands 9 be sufficiently dried. This rust prevention treatment equipment@10 contains ethyl mercaptan (CH,SH) solution, methanethiol (CH
. A mercaptan (RS H) solution such as SR) solution is inserted. This anti-corrosion treatment equipment has 100% copper twisted l1l.
19 is below the surface of the mercaptan (RS H) solution at 90
It travels at a linear speed of around 0m/hr. In this anti-rust treatment, in order to prevent the occurrence of areas on the surface of the conductor (stranded copper wire 9) that the rust preventive liquid will not adhere to,
The vehicle is allowed to travel through a deep position in the rust preventive solution of the tank of the rust preventive treatment device 10 filled with the rust preventive solution. A rust-preventive coating of mercaptan (RSH) is formed on the surface of the copper strands 9 as they travel through the rust-preventing treatment device 10 . The reason why the anti-rust coating is formed on the surface of the copper strands 9 is because of the benzotriazole cupric [(CsH4
Mercaptan (
By forming a film of RSH). This mercaptan (RSH) film is made of cupric benzotriazole (
(C,H4N2.N)2Cu) can suppress the occurrence of patina that occurs when left in an atmosphere at a temperature of 60° C. and a humidity of 80% for 24 hours. In this way, the copper strands fi9 are subjected to rust prevention treatment in the rust prevention treatment device 10, and are wound up on the winding drum 12 as auxiliary complex treated strands 11. In this way, a stranded copper wire that has been subjected to antirust treatment is manufactured. Furthermore, some of these stranded copper wires are manufactured by first twisting and first twisting, depending on the product. That is, the primary stranded wire by first twisting is manufactured by the stranded wire manufacturing apparatus shown in FIG. That is, a stranded wire is manufactured using a plurality of rust-proof treated strands 6 which have been subjected to rust-proof treatment in the rust-proof treatment ring 5 shown in FIG. Rust prevention treatment equipment i!
The plurality of rust-proof treated strands 6 that have been subjected to rust-proof treatment inside S are
It is supplied to the primary stranding machine 13. This primary stranding machine 13 is
A plurality of drawn copper strands 6 subjected to anti-rust treatment are twisted into twisted wires having a desired diameter and thickness. In manufacturing this stranded wire, one of the plurality of rust-proof treated strands 6 is used as a center line, and around this center line, for example, six rust-proof treated strands 6 are arranged and twisted. to produce stranded wire. The copper strands 14 , which have been stranded to a desired diameter in the primary stranding machine 13 , are sent into a rust prevention treatment device 15 . When feeding the rust preventive treatment device 15, it is necessary that the rust preventive agent applied to the surface of the copper strands 14 be sufficiently dried. This rust prevention treatment device 15 is equipped with mercaptan (RS), such as ethyl mercaptan (C2H, SH) solution and methanethiol (CH□SH) solution, which are rust preventive agents.
H) Solution is inserted. A twisted copper wire 14 runs inside this rust prevention treatment device 15 under the surface of a mercaptan (RSH) solution at a linear speed of about 900 m/hr. For this anti-rust treatment, the conductor (copper stranded wire 14) passing through
In order to prevent the occurrence of areas on the surface where the rust preventive solution does not adhere, the vehicle is allowed to travel through a deep position in the rust preventive solution in the tank of the rust preventive treatment device 15 filled with the rust preventive solution. A rust-preventing film of mercaptan (RSH) is formed on the surface of the stranded copper wire 14 as it travels through the rust-preventing treatment device 15. The rust preventive coating is formed on the surface of the copper strands 14 in the fifth step.
As shown in the figure, cupric benzotriazole ((CsH4N2'N) a) is formed on the surface of the copper wire 3.
' Mercaptan (RS
By forming the film 40 of H). In this manner, the copper strands 14 are subjected to rust prevention treatment in the rust prevention treatment device 15, and are wound into the rust prevention treated primary strands 16 via the capstan 17 onto the winding drum 18. In this way, a primary stranded copper wire that has been subjected to antirust treatment is manufactured. Further, the secondary stranded wire by ply twisting is manufactured by the stranded wire manufacturing apparatus shown in FIG. That is, a secondary stranded wire is manufactured using a plurality of rust-preventing primary strands a16 that have been subjected to rust-preventing treatment in the rust-preventing treatment apparatus 15 shown in FIG. The plurality of rust-preventing primary twisted wires 1FjA16 that have been subjected to rust-preventing treatment in the rust-preventing treatment device 15 are supplied to a secondary twisting machine 19. The secondary stranding machine 19 twists the drawn-in plural rust-proofed copper primary strands 16 into secondary strands having a desired diameter and thickness. In manufacturing this secondary stranded wire, one of the plurality of rust-proofed primary stranded wires 16 is used as the center line,
Around this center line, for example, 12 rust-proofed primary twists 1
iA16 is placed and twisted to produce the final twisted wire. The secondary stranded copper wire 20 , which has been stranded to a desired diameter in the secondary stranding machine 19 , is sent into a rust prevention treatment device 21 . A mercaptan (RSH) solution, such as an ethyl mercaptan (C2H.SH) solution or a methanethiol (CH,SH) solution, which is a rust preventive agent, is inserted into the rust prevention treatment device 21. Inside this antirust treatment device 21, a 2° secondary stranded copper wire runs under the surface of a mercaptan (RSH) solution at a linear speed of about 900 m/hr. In this rust prevention treatment, in order to prevent the surface of the conductor (copper secondary stranded wire 20) that the conductor (copper secondary strands 20) passing through from being exposed to spots where the rust prevention solution does not adhere, a tank of the rust prevention treatment device 21 filled with the rust prevention solution is used. This allows the vehicle to run through a deep position in the anti-corrosion liquid. Mercaptan (RS
A rust-preventive coating H) is formed. This copper secondary stranded wire 2o
As shown in FIG. 5, the rust-preventive coating is formed on the surface of the copper primary stranded wire 16 by adding a mercaptan (RSH) coating 40 on top of the mercaptan (RSH) coating 40.
By forming a film 50 of SH). Therefore, according to this example, in the Na2s test to confirm whether the rust preventive film is uniform and can withstand a corrosive environment, l
When the degree of discoloration was observed after immersing it in an OOppm Na, S solution for 30 seconds, the RSH film had an effect of preventing discoloration. In addition, in a patina generation test assuming that moisture has penetrated into the overhead wire, the temperature was 60°C and the humidity was 80%.
When the specimen is left in an atmosphere for 24 hours and the occurrence of patina is observed, the patina that tends to occur with the Cu-BT film alone can be suppressed by covering it with the RSH film. Furthermore, in a red discoloration test to check the degree of red discoloration after being left in air maintained at a temperature of 60'C for 240 hours, RSH, which is sensitive to heat, decomposed when R3H was applied directly to a copper wire. By interposing a Cu-BT film between Cu and RSH, RSH no longer comes into direct contact with copper (Cu), which previously had a negative effect on copper (Cu). It is possible to prevent discoloration that occurs with copper wires that are coated directly with R8H. In this way, the copper secondary stranded wire 2o is subjected to rust prevention treatment in the rust prevention treatment device 21, becomes the rust prevention treated secondary stranded wire 22, and is wound onto the winding drum 24 via the capstan 23. . In this way, a final stranded copper wire is produced which has been subjected to an anti-corrosion treatment. [Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below. This is because the surface of the copper or copper alloy is treated with a benzotriazole-based rust preventive agent and then a mercaptan-based rust preventive agent is used to perform the rust-preventive treatment. A rust-preventing treatment that can form a thick rust-preventive layer and retain its rust-preventing effect for a long time without causing discoloration even if left in harsh conditions such as high temperature and humidity for a long time. be able to. In addition, in the rust prevention treatment method for copper and copper alloy, in which rust prevention treatment is performed in two or more steps when copper or copper alloy is manufactured into a product through multiple steps, one of the two or more rust prevention treatment steps is performed. Since the rust prevention treatment in the first step is performed with a benzotriazole-based rust preventive agent, and the rust prevention treatment in the final step is performed with a mercaptan-based rust preventive agent, the rust preventive layer can be formed thickly, making it possible to avoid high temperatures, high humidity, etc. It is possible to carry out rust prevention treatment that can sufficiently maintain the rust prevention effect for a long time without causing discoloration even if left in an atmosphere under extreme conditions for a long time. Furthermore, the copper or copper alloy single wire formed to the desired wire diameter by a wire drawing machine is immersed and run in a rust prevention tank filled with a benzotriazole-based rust preventive solution, and the original or copper alloy single wire is subjected to rust prevention treatment. The stranded wire formed by twisting and forming two or more of the single wires is immersed and run in a rust-preventing tank filled with a mercaptan-based rust-preventing agent solution to apply rust-preventing treatment to the stranded wire. , a rust-preventing treatment that can be applied more reliably and retains its rust-preventing effect for a long time without causing discoloration even if it is left in an atmosphere with extreme conditions such as high temperature and humidity for a long time. It can be performed. In addition, the copper or copper alloy single wire, which has been formed to the desired wire diameter using a wire drawing machine, is immersed in a rust prevention tank filled with a benzotriazole-based rust preventive solution, and the original or copper alloy single wire is subjected to rust prevention treatment. A primary stranded wire made by twisting and forming two or more solid wires is immersed and run in a rust prevention tank filled with a mercaptan rust preventive solution to apply rust prevention treatment to the primary stranded wire. ,
A secondary stranded wire formed by twisting and forming two or more of the primary stranded wires is immersed and run in a rust prevention tank filled with a mercaptan-based rust preventive solution to apply rust prevention treatment to the secondary stranded wire. As a result, it is possible to reliably form the outermost rust-preventive layer using a mercaptan-based rust preventive solution, and the rust-preventive layer is thick enough to prevent discoloration even if left in harsh conditions such as high temperature and humidity for a long time. It is possible to carry out rust prevention treatment that can sufficiently maintain the rust prevention effect for a long time without causing corrosion.

[Brief explanation of the drawing]

Figure 1 shows an apparatus for manufacturing copper wire by applying rust prevention treatment to copper strands, and Figure 2 shows an apparatus for manufacturing stranded copper wire by applying rust prevention treatment to copper strands. Figure 3 is a diagram showing an apparatus for manufacturing a primary stranded copper wire, Figure 4 is a diagram showing an apparatus for manufacturing a secondary stranded copper wire, and Figure 5 is a cross-sectional view of the stranded wire shown in Figure 4. It is. 1・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・Element wire 5・・・・・・・・・・・・・・・
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・・・・・・Rust prevention treatment device 6・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
...... Rust-proof treated strand 11... Twisted wire machine - Rust-proofed stranded wire Primary stranded wire machine Primary stranded wire Rust-proofed primary stranded wire Secondary stranded wire machine 2 Secondary stranded wire Anti-corrosion treatment Secondary stranded wire

Claims (4)

[Claims] (1) Copper and copper alloys characterized in that the surface of the copper or copper alloy is subjected to rust prevention treatment using a benzotriazole type rust preventive agent and then subjected to rust prevention treatment using a mercaptan type rust preventive agent. Rust prevention treatment method. (2) In a rust prevention treatment method for copper and copper alloy, in which rust prevention treatment is performed in two or more steps when copper or copper alloy is manufactured into a product through multiple steps, the two or more rust prevention treatment steps are performed. A rust prevention treatment method for copper and copper alloys, characterized in that the rust prevention treatment in the first step is performed with a benzotriazole-based rust preventive agent, and the rust prevention treatment in the final step is performed with a mercaptan-based rust preventive agent. . (3) A copper or copper alloy single wire formed to the desired wire diameter by a wire drawing machine is immersed in a rust prevention tank filled with a benzotriazole-based rust preventive solution to prevent the copper or copper alloy single wire from rusting. A stranded wire formed by twisting and forming two or more of the single wires is immersed and run in a rust prevention tank filled with a mercaptan rust preventive solution to apply rust prevention treatment to the stranded wire. Rust prevention treatment equipment for copper alloys. (4) A copper or copper alloy single wire formed to a desired wire diameter by a wire drawing machine is immersed and run in a rust prevention tank filled with a benzotriazole rust preventive solution to prevent the copper or copper alloy single wire from rusting. A primary stranded wire formed by twisting and forming two or more of the single wires is immersed and run in a rust prevention tank filled with a mercaptan rust preventive solution to apply rust prevention treatment to the primary stranded wire. ,
A secondary stranded wire formed by twisting and forming two or more of the primary stranded wires is immersed and run in a rust prevention tank filled with a mercaptan-based rust preventive solution to apply rust prevention treatment to the secondary stranded wire. Rust prevention treatment equipment for copper and copper alloys.