JP2006283041A - Edge mask device for vertical type electrolysis apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an edge mask device for a vertical type electrolysis apparatus, which can stably pass a steel sheet even at a high speed without allowing the steel sheet to contact with an electrode, by minimizing a pressure difference between the surface side and back side of the steel sheet and stabilizing the flow of a plating liquid while passing the steel sheet at the high speed. <P>SOLUTION: The edge mask device 7 for the vertical type electrolysis apparatus is directed at continuously and electrolytically treating the steel sheet by covering both edges of the steel sheet with a edge mask in an electrolytic treatment tank of the vertical type electrolysis apparatus, and passing the steel sheet between the electrodes 4, wherein an open area ratio R expressed by a quotient of an aperture area in both sides of the electrode to be a channel of electrolyte divided by a cross-sectional area between the electrodes is specified by a line speed V according to the function (R≥0.0000007 V<SP>2</SP>-0.00006 V+0.4693). In the above expression, the cross-sectional area between the electrodes is the area of an electrolytic solution to flow into a space between the electrodes from both sides of the electrodes when there is no edge mask; and the aperture area is a value after having subtracted the area of the electrolytic solution to flow into a space between the electrodes from both sides of the electrodes when being interrupted by the edge mask, from the cross-sectional area between the electrodes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an edge mask device installed in an electrolytic treatment tank of a vertical electrolytic treatment apparatus that continuously performs electrolytic treatment on a steel strip.

  In the electroplating of steel strips, a method is known in which a plate is continuously immersed by being immersed in a treatment solution in an electrolytic treatment tank of a vertical electrolytic plating apparatus.

  3A is a schematic sectional view of a conventional vertical electrolytic plating apparatus, and FIG. 3B is a transverse sectional view thereof.

  In FIG. 3, a sink roll 2 is disposed in a tank 1 filled with a plating solution, a conductor roll 3 is disposed on the upper portion of the tank 1, and opposing pairs of electrodes 4 are disposed in the tank 1. . A steel strip 5 is passed between the electrodes 4 through the conductor roll 3 and the sink roll 2, and the steel strip surface is plated. In addition, on each sink roll side of the electrode 4, there is a baffle plate 6 that becomes a pair that regulates an accompanying flow of the plating solution generated by the traveling of the steel strip 5 and generates a pressure difference between the front side and the back side of the steel strip 5. It arrange | positions on both sides of the steel strip 5, and the displacement of the steel strip 5 which generate | occur | produces when the steel strip 5 is wound around the sink roll 2 is prevented (refer patent document 1).

In the vertical electrolytic plating apparatus, edge masks 7 are disposed on both edges of the steel strip 5 to prevent overcoating. FIG. 4 is a perspective view showing an example of an edge mask. In the edge mask 7, openings 8 are formed at equal intervals from the upper part to the lower part in order to facilitate the inflow of the processing liquid from both ends of the steel strip 5. In order to prevent displacement due to the pressure difference between the front and back of the steel strip, which occurs when the steel strip 5 passes through the vicinity of the electrode (discharge surface) at high speed, an opening is provided on the surface of the electrode, and the effect of the pressure difference between the front and back surfaces. (See Patent Document 2).
JP 2002-294494 A Japanese Patent Laid-Open No. 3-97895

  In the tank where the edge mask is installed, the conventional edge mask obstructs the flow of the plating solution flow from both sides of the electrode. Stabilization of plating solution flow between electrodes because the amount of plating solution between the discharge surfaces is insufficient, especially the pressure difference between the front and back of the steel strip becomes significant due to insufficient amount of plating solution on the side where the adsorption phenomenon is about to occur. Cannot be fully realized.

  Therefore, the present invention minimizes the pressure difference between the front and back sides of the steel strip, stabilizes the plating solution flow during high-speed feeding, and prevents the steel strip and electrodes from contacting each other, allowing the steel strip to pass stably even at high speeds. The present invention provides an edge mask device for a saddle-type electrolytic processing apparatus that can be plated.

  In the vertical electrolytic processing apparatus having an edge mask, the present invention defines an opening area on both sides of an electrode serving as a flow path for an electrolytic solution by a line speed of a steel strip in order to stabilize an electrolytic flow between discharge surfaces. This ensures the electrolyte flow from both sides of the electrode.

  The present invention relates to an edge mask device for a vertical electrolysis apparatus, in which both edges of a steel strip are covered with an edge mask in an electrolytic treatment tank of the vertical electrolysis apparatus, and the steel strip is continuously electrolyzed by running between the electrodes. The opening area on both sides of the electrode serving as the electrolyte flow path / cross-sectional area between the electrodes (where, the cross-sectional area between the electrodes: the area where the electrolyte flows from both sides when there is no edge mask, the opening area: the cross-sectional area between the electrodes− The aperture ratio R expressed by the electrolyte solution inflow area from both sides of the electrode obstructed by the edge mask is defined as a function of the line speed V.

In the above configuration, the edge mask is provided with a plurality of openings, and the baffle plate for adjusting the electrolyte-associated flow pressure on each side of the steel strip is provided between the sink roll installed in the electrolytic tank and the electrode. A function that regulates the opening ratio R of the edge mask portion with K = 0.02 to 0.35 as the opening ratio K of the electrode surface serving as the electrolyte flow path from the steel strip thickness direction. R ≧ 0.0000007V ² −0.00006V + 0.4693.

  In the present invention, the flow rate of the treatment liquid between the discharge surfaces is conventionally determined by prescribing the opening area on both sides of the electrode that becomes the flow path of the electrolyte solution by the line speed of the steel strip and ensuring the flow of the plating solution from both sides of the discharge surface. In addition, the steel strip is prevented from coming into contact with the electrode due to insufficient liquid flow between the discharge surfaces during high-speed threading. As a result, the steel band is stable without contact between the steel strip and the electrode even during high-speed threading. Can be passed through.

  Table 1 shows the test results regarding the presence or absence of contact between the steel strip and the electrode in the relationship between the aperture ratio R and the line speed V (mpm). The test was carried out with a continuous vertical electrolyzer having an electrode aperture ratio of 0.03 and a baffle plate provided at the lower part of the electrode as shown in FIG.

The hole area ratio R is expressed as opening area / inter-electrode cross-sectional area. However, in the opening area / inter-electrode cross-sectional area, the inter-electrode cross-sectional area is the area where the inter-electrode cross-sectional area S1 is the electrolyte inflow area from both sides of the electrode when there is no edge mask, as shown by hatching in FIG. As shown in FIG. 1B, the opening area S2 is an inter-electrode cross-sectional area-edge mask area S3, which is an electrolyte inflow area between the electrodes. However, when the edge mask has an opening, the opening area S4 is added to the opening area, and the edge mask area is an area excluding the area S4 of the opening portion.

  As is clear from Table 1, as the hole area ratio decreases, the steel strip and the electrode tend to come into contact with each other as the line speed increases.

FIG. 2 is a graph showing the relationship between the aperture ratio R and the line speed V (mpm). The equation of the curve is R = 0.0000007V ² −0.00006V + 0.4693. At the set aperture ratio, the steel strip and the electrode are in contact at the line speed in the region below the curve, so to prevent contact between the steel strip and the electrode, it is necessary to make the region above the curve, That is, it is necessary to satisfy R ≧ 0.0000007V ² −0.00006V + 0.4693. By satisfying this equation, the pressure difference between the front side and the back side of the steel strip 5 can be minimized and contact between the steel strip and the electrode can be prevented.

  Therefore, by defining the aperture ratio R as a function of the line speed V, it is possible to determine a line speed at which the steel strip does not come into contact with the electrode, and it is possible to stably feed the steel strip.

(A) is the cross-sectional area between electrodes, (b) is the electrolyte inflow area between electrodes. The graph shows the relationship between the aperture ratio R and the line speed V (mpm). (A) is a schematic sectional drawing of the conventional vertical electroplating apparatus, (b) is the cross-sectional view. FIG. 4 is a perspective view showing an example of an edge mask.

Explanation of symbols

1: Tank 2: Sink roll 3: Conductor roll 4: Electrode 5: Steel strip 6: Baffle plate 7: Edge mask 8: Opening

Claims (4)

In the edge mask device of the vertical electrolysis apparatus that continuously electrolyzes the steel strip by covering both edges of the steel strip with an edge mask in the electrolytic treatment tank of the vertical electrolysis apparatus and running between the electrodes,
Open area on both sides of electrode serving as electrolyte flow path / cross-sectional area between electrodes (here, cross-sectional area between electrodes: electrolyte inflow area from both sides when no edge mask is provided, open area: cross-sectional area between electrodes-edge mask) An edge mask device for a continuous vertical electrolytic treatment facility, characterized in that an aperture ratio R expressed by an electrolytic solution inflow area from both sides of the electrode) is defined as a function of the line speed V.   2. The edge mask apparatus for a continuous vertical electrolytic processing facility according to claim 1, wherein a plurality of openings are provided in the edge mask.   Between the sink roll installed in the electrolytic tank and the electrode, a baffle plate for adjusting the flow pressure accompanying the electrolyte on each side of the steel strip is provided so that the position of the steel strip in the width direction can be adjusted. 3. The edge mask device for a continuous vertical electrolytic treatment facility according to claim 1, wherein the aperture ratio K of the electrode surface serving as the liquid flow path is K = 0.02 to 0.35. The function of the aperture ratio R is
R ≧ 0.0000007V ² −0.00006V + 0.4693
The edge mask device for a continuous vertical electrolytic treatment facility according to claim 1, 2, or 3.

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