JPS5964796A - Conductor roll for electroplating line - Google Patents

Abstract

PURPOSE:To attain to enhance the corrosion resistance and the anti-wear property of a conductor roll, by coating the barrel part surface of the conductor roll with a melt comprising a powdery mixture consisting of a metal carbide and an Ni-Cr alloy in a specific ratio. CONSTITUTION:A powdery mixture consisting of 10-90wt% of a metal carbide powder and the remainder of an Ni-Cr alloy powder is prepared. This powdery mixture is contacted with the member to be plated of an electroplating line in a tumbled state and plasma sprayed to the barrel part surface of a conductor roll for guiding said member to be plated. The corrosion due to a plating liquid of the conductor roll is improved by the Ni-Cr alloy while the abrasion due to the contact with a strip thereof is improved by the metal carbide powder and both of anti-wear property and corrosion resistance are enhanced.

Description

[Detailed Description of the Invention] The present invention relates to a conductor four for electroplating line,
Especially regarding conductor rolls with excellent corrosion resistance and abrasion resistance, strips of tin plate or the like are generally subjected to plating treatment as a surface treatment. This plating process is ;l'
Usually, the strip is passed through an electroplating line. General electroplating lines include the halodan electroplating method and the ferrostane method, which are shown in FIGS. 1 and 2.

As shown in FIG. 1, an electroplating apparatus using the Halodan method has a horizontal plating tank 1, into which a plating solution 2 is poured, an anode 3 is arranged, and a strip 4 is conveyed. The strip 4 is conveyed while being sandwiched between a back arag roll 5 disposed on the lower surface side and a conductor roll 6 disposed on the upper surface side, and the plating process is performed thereon. On the other hand, in the plating equipment for the 7Erostan method shown in FIG. 2, a vertical plating tank 7 is provided, a plating solution 8 is filled in the tank 7, and an anode 9 is installed in a suspended state. A deflector roll 10 is placed at the lower rX+~ of the plating tank 7, and a conductor roll 11 is placed at the second part of the tank 7, and both rolls 10.
11, the strip 12 is passed onto the loop and subjected to plating treatment.

Incidentally, in any type of electroplating line of this type, the conductor roll 6.11 is in contact with the plating solution 2.8 directly or indirectly via the strip 4.12. The surface of the roll body of the conventional conductor roll 6.11 is coated with a chrome plating layer 12, as shown in FIG. Due to corrosion, the base iron 13 of the conductor roll 6.11 is exposed after 2 to 3 turns and has to be replaced. This is because it causes scratches.

For this reason, it is conceivable to use a nickel chromium alloy, which generally has excellent corrosion resistance, as a coating layer, but in such a case, although the corrosion resistance is improved, the roll 6.11
Since the hardness of the roll is low, there is a problem in that the roll gets scratched and the quality of the product is impaired.

The present invention focuses on the above conventional problems and aims to provide a conductor roll for an electroplating line that has excellent corrosion resistance and wear resistance.

In order to achieve the above object, the conductor roll according to the present invention is particularly characterized in that the conductor roll has gold (gold)' on the roll surface.
:4 A mixed powder consisting of 10 to 90% by weight of carbide powder and the balance of nickel-chromium alloy powder is thermally sprayed to form a coating layer.

The specific contents of the present invention will be explained below.

The inventors have confirmed through experiments that although nickel-chromium alloys have excellent corrosion resistance, they have problems in terms of wear resistance. Therefore, in order to prevent the corrosion resistance of the nickel chromium alloy from being lost and to improve the wear resistance, we have obtained the knowledge that it is sufficient to disperse metal carbide particles. That is,
As shown in FIGS. 4 and 5, a mixed powder of nickel chromium alloy powder and metal carbide powder is coated on the surface of one part of conductor row /l/20c+J]li for electroplating line by thermal spraying, resulting in a thermal sprayed layer 21. was formed. This sprayed layer 21 has a structure in which metal carbide particles 23 are dispersed in a nickel chromium alloy 22.

24 is the subway.

Here, the metal carbide powder may be any material as long as it has excellent abrasion, surface corrosion, and electrical conductivity. Therefore, tungsten carbide WC, chromium carbide Cr3C.

Vanadium carbide VC, niobium carbide NbC,
Molybdenum carbide Mo2C, tantalum carbide TaC.

Zirconium carbide ZrC, titanium carbide TiC, etc. are used.

However, the metal carbide powder is mixed with the nickel-chromium alloy powder, and the mixing ratio is 10 to 90% of the metal carbide powder, 1. This is the responsibility of the person in charge.

This is because if the gold kj3 carbide powder is less than 10%, the 11i1 thickness of the roll 20 will not be sufficient, and if it is more than 90%, the sprayed layer 21 will become brittle. On the other hand, the nickel-chromium alloy powder not only provides corrosion resistance but also serves as a fused body of metal carbide powder to form the sprayed layer 21.Although its components can be selected arbitrarily, it is useful for thermal sprayed fusion. From this point of view, the ratio of nickel N1 and chromium Cr is 4:
It is recommended that the ratio be within the range of 1 to 1:4.

Next, a mixed powder consisting of the above-mentioned components is thermally sprayed onto the conductor roll 20, and the thermal spraying method may be a plasma method, powder type gas spraying, explosive thermal spraying, or other appropriate means. When spraying, the conductor roll 20 may be sprayed directly onto the base metal 24, or the conductor roll 2 after copper plating may be sprayed.
It is also possible to thermally spray 0. In this case, the effect of electrical conduction remains unchanged.

According to the conductor roll 20 having such a configuration,
Corrosion caused by the plating solution is improved by the nickel chromium alloy 22, and wear caused by contact with the strip is improved by the metal carbide particles 23. Therefore, the conductor roll 20 does not lack electrical conductivity and has improved wear resistance and corrosion resistance.

In addition, depending on the thermal spraying method, to increase the adhesion of the sprayed material,
Trace amount (5 wt% culm) of carbon C1 iron Fe.

Silicon (Si) and boron (B) may be added. In this case, even with the addition of microphytes, the wear resistance, corrosion resistance, and electrical conductivity are not impaired.

Next, specific examples of the present invention will be described.

In this embodiment, the present invention is applied to a conductor roll for an 'itu plating line (see FIG. 1) using the halogen method. The specifications of the roll according to this embodiment are as shown in the table below.

In addition, the line speed is 250. , /agony~480rn/r
/uR, the plating current is 250 amperes to 400 amperes.

When the conductor roll according to Example (1) and +2+ was compared with a conventional chrome-plated conductor roll, the life of the conductor roll according to this example was significantly increased. That is, in the conventional chrome-plated conductor roll, the base metal began to be exposed within two weeks, and the base metal was completely exposed within three weeks, and the roll surface became so rough that it had to be replaced. On the other hand, this example (l)
Conductor rolls related to +2+ can be used continuously without corrosion, wear, or scratches, and are 10 times better than conventional rolls.
The lifespan is more than twice as long.

Here, as long as the thermal spraying thickness is within the range of 0.1 to 3-3, the conductor roll can be made economically inexpensive without impairing the abrasion properties.

As explained below, according to the conductor roll for the '+'lt plating line according to the present invention, the corrosion resistance and abrasion resistance are further improved due to the thermal spray coating, and the roll life is significantly extended. It has the effect of increasing the amount of energy by 4 times.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the Rodan method ηL sensing device, Figure 2
The figure is a sectional view of the neck of a ferrostane electroplating apparatus, FIG. 3 is a sectional view of a conventional conductor roll, FIG. 4 is a sectional view of a conductor roll according to the present invention, and FIG. 5 is a partially enlarged sectional view of the same conductor roll. It is. 6.11.20... Conductor roll, 21... Thermal spray LM% 22... Nickel chromium alloy, 23... Gold-4 carbide particles. Daimisakito Tatsuyuki Unuma (and 2 others) = 59

Claims (1)

[Claims] (1) In a conductor roll that makes rolling contact with and guides a member to be plated in an electroplating line, 10 to 90% by weight of metal carbide powder is applied to the body surface of the conductor roll.
A conductor roll for a pneumatic plating line, characterized in that it is coated by thermal spraying with a mixed powder consisting of a nickel-chromium alloy powder.