JPH0670279B2 - Horizontal electric plating device - Google Patents

Description

The present invention relates to a horizontal electroplating apparatus.

[Prior Art] Zinc-based alloy electroplated steel sheets such as Zn-Fe have various excellent properties such as corrosion resistance, paintability, workability, and weldability. Widely used as steel plate. As a continuous production facility for these zinc-based alloy electroplated steel sheets, a horizontal plating apparatus has been used conventionally.

In recent years, for the purpose of increasing the productivity of zinc-based alloy plated steel sheets,
The operation at high current density tends to be frequently used. When operating at a high current density, when the flow state of the plating solution in the vicinity of the strip interface is poor, it is not limited to zinc alloy plating, but there is a problem that defects called burns occur in the formed plating film. is there.

Further, as a method for producing a zinc-based alloy electroplated steel sheet using a soluble anode, JP-A-59-76890 (hereinafter referred to as "prior art") has been proposed. In the prior art, since the soluble anode is used, the flow state of the plating solution near the anode is a problem. That is,
If the flow state of the plating solution is poor, the surface of the anode may be passivated to cause poor current flow. Therefore, in order to improve the flow state of the plating solution in the vicinity of the strip and the soluble anode, as shown in FIG. 2, the in-jet header 10 is provided near the end faces of the soluble anodes 11 and 11 'on the exit side of the stop. Horizontal plating equipment having a jetting facility is used. In this conventional horizontal plating apparatus, the jet direction of the plating solution to be discharged is set in the direction opposite to the moving direction of the strip 3, and the synergistic effect of the movement of the strip 3 and the jet of the plating solution (generally, this synergistic effect is called. The value obtained by adding the jet speed of the plating solution to the strip running speed in the counter flow opposite to the moving direction of the strip, and the strip running speed from the jet speed of the plating solution in the forward flow in the same direction as the moving direction of the strip. The value, that is, the strip reference relative speed) prevents defective conduction. The relative speed is an index for controlling the alloy composition of the plating burn and the plating film. In the conventional plating apparatus, by such means, agitation near the strip interface is enhanced and operation is performed by increasing the current density.

[Problems to be Solved by the Invention] However, in a conventional horizontal plating apparatus using a soluble anode, when the soluble anode is operated at a high current density, the soluble anode is quickly consumed, and the replacement of the anode is required. It had to be done frequently, resulting in a decrease in productivity. Therefore, instead of the soluble anode, a horizontal plating apparatus using an insoluble anode, which is conventionally shown in FIG. 3, in which the plating solution flows in a direction opposite to the moving direction of the strip 3 (hereinafter referred to as “counterflow horizontal plating apparatus”). Is used).

In recent years, as the current density has been increased, the amount of electricity supplied to one conductor roll (current-carrying roll) has also increased. Since the increase in the amount of electricity also increases the energy loss due to metal resistance, it has become important to shorten the distance between the insoluble anode and the conductor roll for energy saving.

However, the conventional countercurrent horizontal plating apparatus shown in FIG. 3 is provided with the jet header 10 for discharging the plating solution between the dam roll 8a on the outlet side of the plating tank 2 and the insoluble anodes 4a, 4a '. Therefore, in order to secure the installation space for the jet header 10, the distance between the insoluble anodes 4a, 4a ′ and the conductor roll 5a is larger than the distance on the inlet side, and the energy loss due to the metal resistance of the strip 3 is large. There was a problem that was.

Therefore, an object of the present invention is to provide a horizontal electroplating apparatus capable of reducing the distance between the conductor roll and the insoluble anode, reducing the energy loss due to the metal resistance of the strip, and achieving energy saving. is there.

[Means for Solving the Problems] According to the present invention, a pair of horizontal insoluble anodes are arranged facing each other across a moving strip on each of the inlet side and the outlet side of a plating tank. In a horizontal electroplating device provided with a jet header for discharging a plating solution toward an electrode formed by an insoluble anode and the strip, between the insoluble anode on the inlet side and the insoluble anode on the outlet side,
A first jet header that discharges the plating solution toward a direction opposite to the moving direction of the strip toward the inlet-side insoluble anode, and a plating solution in the same direction as the moving direction of the strip toward the outlet-side insoluble anode. It is characterized in that a second jet header for discharging is provided.

Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a horizontal electroplating apparatus showing one embodiment of the present invention. In FIG. 1, 1 is a horizontal plating apparatus, 2 is a plating tank, 3 is a strip of material to be plated, 4,
4 ', 4a, 4a' is an insoluble anode, 5,5a is a conductor roll,
6 is a backup roll, 7 is a plating solution, 8 and 8a are dam rolls, 9 is a support roll, and 10a and 10b are jet headers. In the drawing, the arrow indicates the traveling direction of the strip 3. As shown in Fig. 1, the insoluble anodes 4 and 4 ', 4a
And 4a 'are provided on the upper side and the lower side of the strip 3 so as to face each other. Strip 3 is an insoluble anode 4-4 ', 4
Move between a-4a 'in the direction shown by the arrow. On the upstream side of the support roll 9 provided at the center of the plating tank 2, there is provided a first for discharging the plating solution to the insoluble anodes 4, 4'on the inlet side.
Jet headers 10a, 10a are provided on the downstream side of the support roll 9, and second jet headers 10b, 10b for ejecting the plating solution to the insoluble anodes 4a, 4a 'on the outlet side, respectively. The strip 3 moves in the direction of the arrow, and the insoluble anode 4,
Between the poles formed by 4'and 4a, 4a 'and the strip 3, a counter flow facing the moving direction of the strip 3 from the first jet headers 10a, 10a, and from the second jet headers 10b, 10b. The forward flow in the same direction as the moving direction of the strip 3 is discharged.

In the device of the present invention, since there is no jet header between the insoluble anodes 4a, 4a 'on the outlet side and the dam roll 8a on the outlet side, the distance between the insoluble anodes 4a, 4a' and the conductor rolls 5a is set by the jet header installation. It can be shortened by the space. Therefore, reduction of energy loss due to metal resistance of the strip 3 between the insoluble anodes 4a, 4a 'and the conductor roll 5a is achieved, and energy saving can be achieved.

That is, the distance between the insoluble anode 4a, 4a 'and the conductor roll 5a is x (mm), and the electrode length of the insoluble anode is L (mm).
, The strip width is W (mm), the strip conductivity is σΩ ⁻¹ mm ⁻¹ , the plate thickness is t (mm), and the current is I.
Assuming (A), the energy (voltage) V (volt) lost by the strip resistance (Rs) is Therefore, the voltage when the distance between the insoluble anodes 4a, 4a ′ and the conductor roll 5a is shortened by Δx (mm) is Therefore, Saves energy.

EXAMPLES Next, the present invention will be described in more detail by way of examples.

Using the horizontal plating apparatus 1 shown in FIG. 1, a Zn-Fe alloy electroplated steel sheet was prepared by setting the electrode length of the insoluble anode to 1 m, the distance between the insoluble anode and the conductor roll to 500 mm, and changing the current. Manufactured. Then, the voltage drop due to the strip resistance at this time is measured, and the result is
Shown in the table. As a comparison, a Zn-Fe alloy electroplated steel sheet was manufactured in the same manner as in the examples, using the horizontal plating apparatus shown in FIG. However, the distance between the insoluble anodes 4a and 4a ′ on the output side and the conductor roll was 1000 mm. Then, the voltage drop due to the strip resistance at this time was measured, and the results are shown in Table 2. Here, the metal resistance of the strip is 10 ⁴ Ω ⁻¹ mm ⁻¹ . Table 1 also shows the energy savings (voltage loss) achieved by the examples.

As is clear from Table 1 and Table 2, energy saving is achieved in the examples using the horizontal electroplating apparatus of the present invention.

In this example, the voltage loss per conductor roll was calculated, and the normal plating equipment
Since it has about several conductor rolls,
10 to 20 times more energy can be saved.

[Advantages of the Invention] As described above, according to the present invention, the distance between the conductor roll and the insoluble anode can be shortened, the energy loss due to the metal resistance of the strip can be reduced, and energy saving can be achieved. A useful effect can be obtained.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional horizontal electroplating apparatus using a soluble anode, and FIG. 3 is a horizontal electroplating using a conventional insoluble anode. It is sectional drawing of an apparatus. In the drawings, 1 ... Horizontal plating apparatus, 2 ... Plating tank, 3 ... Strip, 4,4 ', 4a, 4a' ... Insoluble anode, 5, 5a ... Conductor roll, 6 ... Backup roll, 7 ... Plating solution, 8 , 8a ... Dam roll, 9 ... Support roll, 10 ... Jet header, 10a ... First jet header, 10b ... Second jet header, 11, 11 '... Soluble anode.

Claims (1)

[Claims] 1. A pair of horizontal insoluble anodes are arranged to face each other with a moving strip interposed therebetween on each of the inlet side and the outlet side of a plating tank, and the pair of horizontal insoluble anodes are formed by the insoluble anode and the strip. In a horizontal electroplating device provided with a jet header for discharging the plating solution toward the gap between the electrodes, between the insoluble anode on the inlet side and the insoluble anode on the outlet side,
A first jet header that discharges the plating solution toward a direction opposite to the moving direction of the strip toward the inlet-side insoluble anode, and a plating solution in the same direction as the moving direction of the strip toward the outlet-side insoluble anode. A horizontal electroplating apparatus comprising a second jet header for discharging.