JPS6059310B2 - Conductor roll for electroplating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in conductor rolls for electroplating.

Conductor rolls used in electroplating lines are easily damaged by strip edges, and as materials of various widths are manufactured, linear scratches may develop on the conductor roll surface in areas corresponding to the strip edges, causing the surface plating to peel off or damage to the strip surface. There is a problem that it may cause scratches on the surface.

Additionally, this type of conductor roll is generally placed on the inlet side of multiple plating baths arranged in series, so the strip passes through the seal roll on the outlet side of the plating bath and is bitten by the next conductor roll. However, as the strip passes through the seal roll, it is difficult to squeeze the plating solution on both sides, and even after passing through the seal roll, the plating solution remains on the edges and gets caught in the conductor roll. Put it away. If the plating solution is a particularly corrosive low pH solution or chloride-based solution, the plating solution remaining on this strip will corrode the surface near both ends of the conductor roll, making it unusable in a short period of time. The problem is that it becomes . From such a thing,
The inventors first developed a conductor roll that would not be damaged by the strip edges and would not be eroded by the plating solution remaining on the strip by using rubber or synthetic resin over a predetermined width at both longitudinal ends of the roll. Proposed a conductor roll lined with wood (Jetgan 5th
No. 6-1607 (Utility Model Application No. 57-129776)). However, according to subsequent research by the present inventors, although the above-mentioned conductor roll has an extremely large advantage in that there is no damage to the roll surface, the adhesive strength of the lining material may be affected depending on the type of base metal of the roll. Because of this, blisters occur between the lining material and the base metal in a short period of time, and these blisters are damaged and cracks occur, causing the lining to peel off or the plating solution to penetrate through these cracks and damage the base metal. It turned out that there is a drawback that it erodes the water. The present invention has been devised in view of these problems, and it is an object of the present invention to provide a conductor roll that is not damaged by strip edges and can withstand long-term use. Therefore, in the present invention, two of Ni, Cr, Mo, and Co are applied to a portion over a predetermined width near both ends of the roll base material.
A thermally sprayed coating layer made of an alloy containing at least one of the above-mentioned species is provided, and the thermally sprayed coating layer is used as a base material, and the portion over the above-mentioned predetermined width is lined with a rubber material or a synthetic resin material. Since the vicinity of the lining passes over the lining, not only can the metal surface of the roll be prevented from being damaged and eroded by the plating solution, but also the anchoring effect of the sprayed coating layer provides great adhesive strength to the lining material's base. There are things that can properly prevent the occurrence of blisters, etc. An embodiment of the present invention will be described below with reference to the drawings. In the drawings, 1 is a conductor roll according to the present invention, 5 is a backup roll, and 6 is a strip.

The conductor roll has a roll base material 1, which is the main body, made of a metal roll, and linings 2, 2 made of a rubber material or a synthetic resin material are provided over a predetermined width on both longitudinal ends of the roll base material 1. However, this lining 2
, 2 is applied to the surface of the base material 1 in a predetermined width portion.
, Cr, MO, and CO are provided, and the linings 2, 2 are applied using the thermal spray coating layers 3, 3 as a base material. To explain such a roll structure more specifically, the metal roll base material 1 has a diameter smaller at both ends in the longitudinal direction than at the center part, and the thermal spray coating layers 3, 3 are applied to the small diameter parts. The lining 2 is formed using this as a base material.
, 2 are applied, whereby the central portion of the roll becomes an exposed metal portion for conducting electricity. Note that the roll base material 1 is also lined on both end surfaces thereof. The thermal spray coating layer 3 is formed by a suitable thermal spraying method such as the so-called plasma spraying method, and since it is a metal layer formed by thermal spraying in this way, a rough surface structure with many pores can be obtained.

And due to the anchoring effect of such rough surface texture,
A large adhesive strength of the lining 2 thereon can be obtained, and blistering and the like of the lining 2 can be appropriately prevented. In addition, if the roughness of this thermal spray coating layer is too large, it will affect the corrosion resistance.
It is desirable to adjust the roughness to a limit of about 0%. Specifically, it is desirable to adjust the surface roughness to a range of about HmaxlO to 30μ. Moreover, the above-mentioned coating layer is made of Ni,
It is made of an alloy containing two or more of Cr, MO, and CO. All of these four types of components have excellent corrosion resistance, but by using two or more of these, it is possible to obtain a substrate surface structure with even better corrosion resistance. Even if the coating 2 is damaged due to some reason (for example, wear, etc.), the erosion can be kept to a minimum.
In addition, the thermal spray coating layer 3 is 0.1 to 1.079! It is formed to a certain thickness. Table 1 shown below illustrates the components of the thermal spraying material that should constitute the coating layer 3 and the thermal spraying method. The width of the linings 2, 2 and the exposed metal portion 4
The width is determined in consideration of the current carrying capacity, the minimum width of the strip 6, the width of the residual plating liquid on the strip 6 after passing through the seal roll, etc. Specifically, it is necessary to prevent the strip edge and the plating liquid adhering portion in the vicinity thereof from coming into contact with the exposed metal portion 4, and for this reason, the exposed metal portion 4 is configured to be smaller than the minimum strip width. The plating solution tends to be more residually deposited on the strip edge side, and the deposit width is usually 50 TI 1 m or more on one side. Therefore, the width of the exposed metal portion 4 is at least 100 Tnm (5" x 2) from the minimum strip width. It is preferable to make the width less than or equal to the width obtained by subtracting . The material of the lining 2 is made of rubber or synthetic resin, which has excellent insulation, heat resistance, and corrosion resistance, and has a hardness above a certain level. The hardness is preferably about HS75±5 in view of wear resistance. Specifically, materials such as SBR and NBR are used. Further, it is preferable that the thickness of this lining 2 is usually 10 m or more. The upper surface of the lining 2 is flush with or slightly higher than the exposed metal portion 4, but this level is appropriately selected depending on the hardness of the lining material and the pressing force against the strip 6. Further, as the material of the roll base material 1, any conventional metal roll can be used, such as Cr plating, Hastelloy, Ni plating, multilayer plating, various alloy plating, etc.

FIG. 2 shows an embodiment of the joint between the lining 2/sprayed coating layer 3 and the exposed metal portion 4, in which the Nl plating layer 102 is formed on the entire Fe base body 101, and then the exposed metal portion 4 A Cu plating layer 103 having a tapered end portion is formed only on the portion constituting the same, and a Cr plating layer 104 is further formed thereon.

A thermal spray coating layer 3 is formed on a portion other than the exposed metal portion 4 (including the tapered portion), and a lining 2 is applied thereon. The end portion of the lining 2 overlaps the tapered portion, and the upper surface thereof is configured to be higher than the upper surface of the Cr plating layer 103. The results of testing the durability of the conductor roll of the present invention with respect to blistering are shown in Table 2 below in comparison with other conductor rolls.

As the rolls of the present invention, two types of conductor rolls each having a thermal spray coating layer having the following composition as its lining base were used. [Lining material of the present invention] (1) MO-Cr-Ni alloy thermal spray coating layer, average value of current 20,000 AI, conductor roll As is clear from the above table, the conductor roll of the present invention does not contain plated material or other lining materials. It can be seen that compared to other conductor rolls that have a metal base lined, the occurrence of blisters due to lining is suppressed for a long period of time, and good durability is obtained.

As described above, according to the present invention, the edges of the strip and the vicinity thereof pass through the lining made of rubber or synthetic resin, so that there is no risk of damage to the roll surface metal due to the strip edges and roll damage caused by the plating liquid remaining on both sides of the strip. Not only can it prevent corrosion of the metal parts, but the thermal sprayed coating layer provided as the lining base allows the lining to adhere to the roll body with great adhesive strength, which is an excellent feature that prevents blisters etc. from occurring over a long period of time. This has the effect of increasing durability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half-sectional view showing one embodiment of the conductor roll of the present invention.

FIG. 2 is a sectional view partially showing an embodiment of the connection between the lining, the thermally sprayed coating layer, and the exposed metal portion of the conductor roll of the present invention. In the figure, 1 is a roll base material, 2,
2 indicates the lining, and 3 and 3 indicate the thermal spray coating layers.

Claims (1)

[Claims] 1 Ni and C are applied to the parts over a predetermined width near both ends of the roll base material.
A conductor roll for electroplating, comprising a thermally sprayed coating layer made of an alloy containing two or more of R, Mo, and Co, and using the thermally sprayed coating layer as a base, a portion extending over the above-mentioned predetermined width is lined with a rubber material or a synthetic resin material. .