JP2908210B2 - Insoluble anode for electroplating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insoluble anode for electroplating disposed in a plating solution layer for continuously plating a metal strip.

[0002]

2. Description of the Related Art For example, an electroplated steel sheet is known as a rustproof steel sheet used in vehicles and the like. In the production of this electroplated steel sheet, the steel strip (metal strip), which has been subjected to the degreasing step and the pickling step, is continuously transferred into the plating solution tank at a predetermined transfer speed, and is disposed inside the plating tank. The plating solution is passed through the plating solution layer while providing a plating solution region at a predetermined interval between the anode and the anode. Then, in the plating solution layer region between the steel strip and the anode, electrolysis is performed between the steel strip and the anode while using the steel strip as a cathode while generating a plating solution flow in a direction opposite to the transport direction of the steel strip at a predetermined flow rate. Electroplated steel sheets are manufactured by electrodepositing a predetermined metal coating on the surface of the steel strip.

[0003]

The anode disposed in the plating bath is a plate-shaped insoluble anode disposed to face the front and back surfaces of the steel strip moving in the plating bath. Is used. An insulator made of an insulating material is provided on the surface of the insoluble anode facing the steel strip, as disclosed in Japanese Patent Application No. 61-124599, "Divided Insoluble Anode for Electroplating". (Hereinafter, the same name as the present invention will be referred to as “protector”.)

That is, the protector disclosed in Japanese Patent Application No. 61-124599 is formed in a rectangular parallelepiped shape having a rectangular cross-sectional shape as in the first conventional example shown in FIGS. The protector 1 has a steel strip 2 conveyed in the direction of an arrow A in a plating solution layer, a plurality of steel strips 2 connected in the longitudinal direction so as to extend in the width direction, and the connected body is made of steel. The band 2 is fixed to the surface of the insoluble anode 3 so that at least one pair is provided at a predetermined interval in the moving direction of the band 2. As a result, even if the steel strip 2 in the plating solution layer is bent downward, the steel strip 2 is blocked by the protector 1 and does not come into contact with the insoluble anode 3, thereby preventing the deterioration of the insoluble anode 3.
Reference numeral 4 denotes a header.
, A plating solution is injected in the direction of arrow B opposite to the moving direction of the steel strip 2 to generate a plating solution flow between the steel strip 2 and the insoluble anode 3 at a predetermined flow rate. Further, as another arrangement of the protector, as in the second conventional example shown in FIGS. 7 and 8 ,
A method in which the longitudinal direction of each protector 1 is arranged on the surface of the insoluble anode 3 along the transport direction of the steel strip 2, and FIGS.
As in the third conventional example indicated by reference numeral 0 , there is a method in which each protector 1 is disposed on the surface of the insoluble anode 3 in a state of being inclined with respect to the transport direction of the steel strip 2 in the direction of arrow A.

However, in the arrangement of the protector 1 shown in the first conventional example, the plating solution flow generated between the steel strip 2 and the insoluble anode 3 causes the side surface of the protector 1 to rise vertically from the surface of the insoluble anode 3. And a turbulent state occurs. Due to the turbulent state of the flow of the plating solution, uneven plating occurs on the surface of the steel strip 2, and the surface appearance of the manufactured plated steel sheet is impaired, and there is a problem in quality.
Therefore, it is conceivable that the protector 1 is designed to have a low height of about 1 to 2 mm so that the plating solution does not become turbulent. The prevention of contact with the anode 3 becomes incomplete, and therefore, the turbulent state of the plating solution flow and the prevention of contact between the steel strip 2 and the insoluble anode 3 cannot be simultaneously solved.

In the arrangement of the protector 1 shown in the second conventional example and the third conventional example, the turbulence of the plating solution flow is slightly reduced as compared with the first conventional example, but the width of the steel strip 2 is reduced. In some cases, the end portions in the directions are not reliably prevented from contacting by the protector 1. Further, in the third conventional example, much labor and time are required to attach the protector 1, and there is a problem in terms of manufacturing cost. .

Therefore, the present invention has been made in view of the above circumstances, and reliably prevents contact with a steel strip, and almost eliminates the turbulence of the plating solution flow between the steel strip and the insoluble anode. An object is to provide an insoluble anode for electroplating that does not generate.

[0008]

The insoluble anode for electroplating according to the present invention is disposed opposite to a metal strip continuously conveyed into a plating bath, and a plating solution having a predetermined flow rate is provided between the metal strip and the metal strip. This is an insoluble anode for electroplating in which an insulative protector is protruded on the surface facing the metal strip while generating a flow. The protector, the inclination of the longitudinal sides 20 ° to 45 ° relative to the surface of the insoluble anode
It is formed into a long member with a trapezoidal cross section rising at an angle ,
And, 3 mm from the surface of the insoluble anode and the side surface is perpendicular to the plating solution flows extend across the width direction of the metal strip
It is fixed at a protruding height of ~ 5 mm and the metal
Insoluble porosity near the edge of the metal strip extending in the transport direction of the strip
A long edge mask with insulating properties to shield the poles
Supported by the protector so that it can be moved in the width direction
Have been .

[0009]

According to the insoluble anode for electroplating of the present invention,
The plating solution flow generated between the metal strip and the insoluble anode,
When passing through the protector fixed on the surface of the insoluble anode, a trapezoidal cross section extending across the width of the metal strip
Keep the side of the protector at 20 ° to the surface of the insoluble anode.
45 ° tilt angle, height of protrusion from surface of insoluble anode
Since the length is set to 3 mm to 5 mm, it flows slowly and laminarly on the side surface. Also supported by protectors
An edge mask blocks the insoluble anode near the edges of the metal strip.
To prevent current concentration near the edge. This
Therefore, plating unevenness hardly occurs on the surface of the steel strip.

Further, the protector provided with the inclined side surface for preventing the turbulent state of the plating solution flow is provided with an insoluble anode.
Conventional protection with 3mm to 5mm protruding height from the surface
Since the protruding height can be set higher than that of the metal strip, the contact between the metal strip and the insoluble anode is reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the insoluble anode for electroplating of the present invention will be described below with reference to the drawings. In addition, from FIG.
The same components as those described in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted. 1 to 3 relate to the present invention.
This is one embodiment . In this embodiment, the insoluble anodes are opposed to each other below the steel strip 2, but the insoluble anodes of the same shape are also symmetrically opposed to each other above the steel strip 2.

Surface 6a of insoluble anode 6 facing steel strip 2
The protector 9 is fixed to the elongate body having a trapezoidal cross section longer than the width of the steel strip 2 in the width direction. Then, the protector 9 with is set to a predetermined protrusion height h, longitudinal side 9a, 9b is predetermined inclination angle θ is formed as an inclined surface that is attached to the surface 6 a .

The protector 9 has a longitudinally inclined surface 9.
The a and 9b extend across the width direction of the steel strip 2 and are fixed to the surface 6a of the insoluble anode 6 so as to be orthogonal to the plating solution flow in the arrow B direction. The other protector 9 is also fixed to the surface 6a of the insoluble anode 6 so as to be disposed in parallel with the protector 9 in the longitudinal direction of the steel strip 2 at a predetermined interval . The above-mentioned interval is a distance that can prevent contact with the insoluble anode 6 even when the steel strip 2 in the plating solution layer is bent downward.

Further , the protector 9 is provided on the edge 2 of the steel strip 2.
The edge mask 10 that shields the insoluble anode 6 near a is moved.
The structure is movably supported. That is,
The rod mask 10 is a rod formed of an insulating material such as a resin.
10a and legs fixed to the rod 10a at predetermined positions
It is composed of parts 10b and 10b.

Further , the protector 9 is provided as shown in FIG.
At the intermediate position between the inclined surfaces 9a and 9b in the longitudinal direction.
A long groove 9c is formed, and the lower side of the protectors 9, 9 is formed.
Is fixed in a state where it is embedded in the insoluble anode 6 and then protected.
The edge masks 10 and 10 are inserted into the long grooves 9c of the
The leg 10b is mounted.

Next, a specific example of this embodiment will be described with reference to Table 1 and FIG . Table 1 shows the protrusion height h of the protector 9.
And changing the numerical value of the inclination angle θ of the inclined surfaces 9a and 9b ,
This is a survey of the appearance of the manufactured steel strip. FIG. 4
Fig. 5 shows the results of investigation of the life of the insoluble anode 7 due to a change in the numerical value of the protrusion height h of the protector 9 .

[0017]

[Table 1]

As is apparent from the above Table 1, the protector 9 having the projecting height h in the range of 3 mm to 5 mm and the inclination angle θ of the side surfaces 9 a and 9 b in the range of 20 ° to 45 ° is the same as that of the insoluble anode 6. By fixing to the surface 6a, the flow of the plating solution between the steel strip 2 and the insoluble anode 6 gradually flows from the inclined surface 9b of the protector 9 along the inclined surface 9a in a laminar flow state. In addition, the edges supported by the protectors 9 and 9
The dimask 10 is an insoluble anode near the edge 2a of the steel strip 2.
6 to prevent current concentration near the edge 2a of the steel strip 2.
Stop. Thus, with very little turbulence generated in the plating solution flow between the steel strip 2 and the insoluble anode 6, in the surface of the steel strip 2 INO plating unevenness such occurs, the plated steel sheet exhibited excellent appearance Manufactured.

As is clear from FIG. 4 , the protector 9 of the present embodiment has a sufficient protrusion height h (in the range of 3 mm to 5 mm). There is no risk of contact at all, and the life of the insoluble anode 6 can be extended. Moreover, because only fixing a plurality of elongated protector 9 to the surface 6 a of the insoluble anode 6, the time required for mounting is greatly reduced.

[0020]

As described above, according to the insoluble anode for electroplating of the present invention, when the plating solution flow generated between the metal strip and the insoluble anode passes through the protector on the surface of the insoluble anode, Extends across the width of the metal strip
The side of the trapezoidal protector with a cross section
20 ° to 45 ° with respect to the insoluble anode.
Since the height of protrusion from the surface is set to 3 to 5 mm,
The liquid flow gradually flows in a laminar state on the side.
The edge mask supported by the protector is
Shielding the insoluble anode near the edge of the genus belt to near the edge
Current concentration on the surface of the steel strip.
Seldom occurs , and a high-quality electroplated steel sheet can be manufactured continuously.

Further, the protector provided with the inclined side surface for preventing the turbulent state of the plating solution flow is provided with an insoluble anode.
Since the protruding height from the surface Ru can be set high protrusion height than the conventional protector as 3 mm to 5 mm, ensures contact between the steel strip and an insoluble anode is prevented, therefore,
The life of the insoluble anode can be extended. Furthermore, since attachment is completed only by fixing a plurality of long protectors on the surface of the insoluble anode, the manufacturing cost of the insoluble anode can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of the present invention.

FIG. 2 is a side view showing one embodiment of the present invention.

FIG. 3 is a side view showing a protector according to the present invention.
You.

FIG. 4 is a diagram showing the durability of the insoluble anode of the present invention.
You.

FIG. 5 is a plan view showing a conventional insoluble anode of the first embodiment.
is there.

FIG. 6 is a side view showing a conventional insoluble anode of the first embodiment.
is there.

FIG. 7 is a plan view showing an insoluble anode according to a second conventional example.
is there.

FIG. 8 is a side view showing an insoluble anode according to a second conventional example.
is there.

FIG. 9 is a plan view showing an insoluble anode according to a third conventional example.
is there.

FIG. 10 is a side view showing an insoluble anode according to a third conventional example.
It is.

[Explanation of symbols]

2 Steel strip (metal strip) 4 Header 5 Nozzle 6 Insoluble anode 6a Surface of insoluble anode 9 Protector 9a, 9b Slant surface (side face) in the longitudinal direction of protector A Transport direction of metal strip B Direction of plating solution flow θ Insoluble anode Tilt the side of the protector to the surface
Oblique angle h Projector height of protector

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoyuki Ota 1-chome, Kawasaki-dori, Mizushima, Kurashiki-shi, Okayama Pref. Kawasaki Steel Corporation Mizushima Steel Works (56) References ) Japanese Utility Model 62-175073 (JP, U) Japanese Utility Model Application Hei 5-94277 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C25D 17/10-17/12 C25D 21 / 00,7 / 06

Claims (1)

(57) [Claims] 1. A metal strip which is continuously conveyed into a plating bath and is arranged opposite to the metal strip, and a plating solution flow having a predetermined flow rate is generated between the metal strip and a metal strip. in the insoluble anode electroplating comprising projecting a protector having sex, protector, cross-sectional trapezoidal longitudinal side rises at an inclination angle of 20 ° to 45 ° relative to the surface of the insoluble anode
Jo of being formed in the elongated member, and the side surface protrusion height 3mm~5mm from the surface of the <br/> insoluble anode and extend across the width direction of the metal strip perpendicular to the plating liquid flows And the metal strip extends in the transport direction of the metal strip.
Has insulating properties to shield the insoluble anode near the edge of the band
A long edge mask can be moved in the width direction.
An insoluble anode for electroplating, which is supported by the protector as described above .