JPH05156485A - Conductor roll for plating extremely thin metallic foil - Google Patents

Abstract

PURPOSE:To provide the conductor roll for plating extremely thin metallic foil which hardly generates the trace of the pressing by a level difference between an energizing part and an insulating part. CONSTITUTION:This device consists of a means for disposing closed cellular ceramic layers on the front layer of the conductor roll for the purpose of insulating both sides in an axial direction. The ceramic layers of the conductor roll 3 are constituted of thermally sprayed alumina layers 12. The difference in the coeffts. of thermal expansion and difference in hardness between the energizing part and insulating part of the conductor roll are more approximated and, therefore, the level difference is hardly generated in the boundary part between the energizing part and the insulating part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor roll used in a radial type plating facility for electroplating zinc or the like on the strip surface of a steel strip or the like, and more particularly to a conductor roll for ultrathin metal foil plating.

[0002]

2. Description of the Related Art A radial type plating apparatus conventionally used as equipment for high speed electroplating has a structure as shown in FIG. There are conductor rolls 3 partially immersed in the plating solution tank 1 and the plating solution 2 and deflector rolls 4 and 4 on both upper sides thereof, and the strip 5 is conveyed through the deflector roll 4, the conductor roll 3 and the deflector roll 4. It The plating metal is eluted from the soluble anode 7 set on the electrode 6 (main anode) during the passage of the strip 5 by energization, or in the case of an insoluble anode, one side of the strip 5 is formed by the metal ions in the plating solution. The surface is plated.

A conductor roll of a conventional radial cell type plating apparatus has a soft rubber as an insulating material in order to prevent backing of a plating solution during immersion and to prevent deposition of zinc or the like to be plated on the conductor roll. Was used as part of the conductor roll.

Further, in Japanese Patent Publication No. 2-8037, information on a level difference generated between a current-carrying ring made of metal or the like and a rubber member is detected and fed back, and such a level difference is adjusted by controlling a cooling medium temperature. The method of doing is described.

Further, Iron and Steel Engineer, October 1971 issue, p. 54-58, describes a non-plated surface and a conductor roll by a sealing effect of a rubber insulating part as a treatment method before single-sided plating. Between the non-plated surface and the conductor roll (Protectiv
eFluid Rinse) is described.

[0006]

However, in the conductor roll using a soft rubber as an insulating material in order to prevent the backing of the plating solution during immersion and the deposition of zinc etc. on the conductor roll, Because of the large hardness difference between the metal conductive member and the rubber member, it was difficult to finish the rubber member and the metal conductive member at the same level during surface polishing in the conductor roll finishing step. In addition, due to the deformation of the rubber when the line tension is increased, the abrasion of the rubber due to the strip passing plate, and the difference in the coefficient of thermal expansion with respect to temperature changes, the occurrence of a step between the metal current-carrying member and the rubber member is prevented. It was also difficult to hold down. Moreover, if it is attempted to completely seal the conductor roll and the strip in this state, in the case of the strip of ultra-thin metal foil, streak-like flaws (holding marks) may be generated or unnecessary due to the influence of the drag force near the step. I had a problem with my ear growing.

Further, in the application of the invention described in Japanese Patent Publication No. 2-8037, which detects and feeds back the step information generated between the metal energization member and the rubber member, and adjusts the step by controlling the cooling medium temperature, Although the step is not a problem for the plating of normal plate thickness, for plating of ultra-thin metal foil,
Since the plate thickness is thin, there is a problem that when a line tension is applied, pressing marks are easily generated on the ultrathin metal foil. Furthermore, as a treatment method before single-sided plating, the sealing effect of the rubber insulation part prevents the infiltration of the plating solution between the non-plated surface and the conductor roll, and further drip electrolytic solution between the non-plated surface and the conductor roll. The Iron and Steel Enginee
The description of r) does not disclose means for achieving ultrathin foil radial cell plating.

[0008]

In order to achieve the above-mentioned object, the present invention uses a radial cell and in a conductor roll of an electroplating apparatus for plating the surface of a strip or the like, a continuous hole for electrical insulation. The ceramic layers in the state are arranged on the surface layers on both sides in the axial direction of the conductor roll. Further, the present invention is
The ceramic layer of the conductor roll is an alumina sprayed layer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a conductor roll of an ultrathin metal foil electroplating apparatus according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing an outline of an embodiment of the present invention. FIG. 2 is an enlarged sectional view of the conductor roll according to the embodiment of the present invention. In FIGS. 1 and 2, the conductor roll 3 has a current-carrying ring 11 at the center of the outer circumference of a hollow metal roll 10 and alumina sprayed parts 12 at both ends thereof, and an internal hollow part 13 absorbs Joule heat due to a plating current. Therefore, the cooling water supplied from one of the central shafts 14 is filled. The conductor roll 3 is provided with the alumina sprayed ceramic parts 12 in the state of no communication holes for insulation on both sides in the axial direction on the surface layer of the conductor roll 3.

The current-carrying ring 11 is made of stainless steel or alloy steel such as Hastelloy from the viewpoint of corrosion resistance and wear resistance.
For example, the coefficient of linear expansion of Hastelloy is 1.2 × 10 ^-5 / ° C. Further, the linear expansion coefficient of synthetic rubber conventionally used for insulating both sides of the conductor roll, such as urethane rubber, is 17.1 × 10 ^-5 / ° C. On the other hand, in the alumina ceramic used in the present invention, 0.8 × 10 ⁻⁵ /
Since it is closer to the value of iron-based materials than the value of urethane rubber at ℃,
A difference between the current-carrying part and the insulating part is unlikely to occur due to temperature changes. The conductor roll axial width of the energizing ring 11 is
The width is set to be narrower than the width of the ultra-thin metal foil strip 5 so that extra plating does not adhere to the current-carrying ring.

Further, the end disk (side disc) of the conductor roll 3 is conventionally lined with the same soft rubber or hard rubber as that of the cylindrical insulating portion of the conductor roll 3, but the transfer of electric charge with the plating solution is performed. In order to prevent and avoid unnecessary plating adhesion, it is preferable to line FRP (fiber reinforced plastic) on the surface layer.

In this embodiment, when alumina ceramic is used for the insulating portion, it is preferable to use plasma spraying, for example. Although there is some difference depending on the skill level, generally, when the alumina sprayed layer thickness is 0.5 mm or more, particularly preferably 0.7 mm or more, the pores in the alumina sprayed layer bulk lose their communication and no communication It becomes the alumina sprayed portion 12 of the hole.

As described above, by forming the alumina ceramic layer as a layer having no communication hole, the insulation property of the alumina bulk is perfected, and the plating current from the current-carrying portion is not shunted, so that the ultrathin metal can be more reliably formed. By energizing the foil strip 5, the alumina sprayed portion 12 is less likely to be plated, and a good plated film can be efficiently formed.

In FIG. 2, reference numeral 12A is an alumina ceramic sprayed layer, 5 is a strip having a thickness of, for example, about 20 μm to 100 μm, 11 is an energizing ring, and 12B.
Is a base for spraying the alumina ceramic 12A.

According to the present invention, the coefficient of thermal expansion and hardness of the ceramic layer in the state of no-communication holes provided for the insulation of both sides of the conductor roll of the radial cell plating apparatus are determined by The hardness value can be brought closer than in the case of the prior art. Therefore, the boundary between the conducting portion and the insulating portion of the conductor roll is continuous regardless of the temperature change, and the surface layer can be a more cylindrical conductor roll. Then, Joule heat due to energization can be absorbed well, and can be matched well with the ultrathin metal foil conveyed from the deflector roll.

[0016]

As described above, according to the conductor roll of the ultra-thin foil radial cell plating apparatus according to the present invention, the difference in the coefficient of thermal expansion between the conductor roll energizing part and the insulating part
Since the difference in hardness is made closer than in the conventional case, a step is unlikely to occur at the boundary between the current-carrying part and the insulating part, and even an ultrathin foil has the effect of suppressing the generation of pressing marks and being able to perform good plating. And, even in the case of an ultra-thin metal foil strip, it is possible to plate without tension by the tension applied to complete the seal. Further, since the ceramic layer is inherently less likely to change with time as compared with the conventional soft rubber, it is possible to provide a maintenance-free conductor roll that saves the trouble of sequentially renewing it.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a conductor roll according to an embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a conventional radial plating facility.

[Explanation of symbols]

 3 ... Conductor roll 5 ... Strip (ultra-thin metal foil strip) 12 ... Alumina sprayed portion 12A ... Alumina sprayed layer

Claims (2)

[Claims] 1. In a conductor roll of an electroplating apparatus for plating the surface of a strip using a radial cell, a ceramic layer in a state of no communication holes for electrical insulation is provided on both side surface layers in the axial direction of the conductor roll. A conductor roll for plating an ultra-thin metal foil, which is characterized by being arranged. 2. The conductor roll for ultrathin metal foil plating according to claim 1, wherein the ceramic layer of the conductor roll is an alumina sprayed layer.