JP2012036492A - Method for continuous surface treatment of metal strip and apparatus for continuous surface treatment of metal strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make uniform the distribution of the amounts of film deposition in the strip width direction of a metal strip when applying a surface coating film such as an electrical insulation film to the surface of the metal strip by the electrolysis of an electrolyte solution.SOLUTION: A method for the continuous surface treatment of the metal strip 1 comprises applying a surface film such as an electrical insulation film or a plating film to the surface of the metal strip 1 to be continuously conveyed by the electrolysis of an electrolyte solution. The method comprises disposing a positive electrode 33 so as to be opposite to the treatment surface 1a of the metal strip 1 to which the surface film is applied, ejecting the electrolyte solution as a laminar flow Wr to the treatment surface 1a of the metal strip 1 from the positive electrode 33, and applying an electric voltage between the metal strip 1 used as a cathode and the positive electrode 33 used as an anode to allow an electric current to flow through the electrolyte solution Wr as the laminar flow ejected from the positive electrode 33.

Description

  The present invention relates to a continuous surface treatment method and a continuous surface treatment apparatus for a metal strip in which a surface coating such as an electrically insulating coating or a plating coating is coated on the surface of a continuously transported metal strip by electrolysis of an electrolytic solution. is there.

  Conventionally, the surface of a metal strip such as a steel strip that is continuously conveyed is coated with a surface coating such as an electrically insulating coating or a plating coating by electrolysis of the electrolytic solution, and the metal strip is electrically insulated or decorative. Attempts have been made to add various functions such as rust prevention (see, for example, Patent Documents 1 and 2). As a continuous surface treatment method for coating the surface of such a metal strip with a surface coating, conventionally, a method as described below is known.

  FIG. 13 is a side view schematically showing an example of the configuration of the continuous surface treatment apparatus 103 for realizing the conventional continuous surface treatment method. The continuous surface treatment apparatus 103 includes an electrolytic bath 161 in which an electrolytic solution W is stored, and a plurality of plate-like electrodes that are immersed in the electrolytic solution W in the electrolytic bath 161 and sequentially disposed in the transport direction P of the metal strip 101. 131. The metal strip 101 is continuously conveyed so as to face the plate-like electrode 131 after being immersed in the electrolytic solution W while being guided by the conductor roll 181 and the like with respect to the continuous surface treatment apparatus 103. .

  In order to coat the surface of the metal strip 101 with the continuous surface treatment apparatus 103, a voltage is applied between the plurality of plate-like electrodes 131, and a plurality of plates are passed through the metal strip 101 and the electrolyte W. The electrode 131 is energized. Thereby, it becomes possible to coat the surface of the metal strip 101 facing the electrode 131 serving as the anode by electrolysis of the electrolytic solution W.

WO2003 / 048416 Japanese Patent Publication No. 61-015960 Japanese Patent Application Laid-Open No. 07-11490

  By the way, in the conventional continuous surface treatment method, since it is necessary to proceed the electrolysis of the electrolyte solution W in a state where the metal strip 101 is immersed in the electrolyte solution W, the plate width of the metal strip 101 immersed in the electrolyte solution W is increased. Current concentration occurred at the end of the direction. For this reason, in the conventional continuous surface treatment method, as a result of an increase in the coating amount at the end in the plate width direction, the distribution of the coating amount in the plate width direction of the metal strip 101 becomes non-uniform. was there. When coating the surface of the metal strip with an electrically insulating film, the toughness of the electrically insulating film is generally not very good, so if the amount of film adhesion increases, the film easily cracks and peels, This problem appeared to be more prominent.

  Further, in the conventional continuous surface treatment method, it is necessary to proceed with the electrolysis of the electrolyte solution W in a state where the metal strip 101 is immersed in the electrolyte solution W, so that the surface opposite to the surface to be treated is to be coated. There is a problem that current flows around one side of the film and the surface film is also coated on the other side.

  In order to solve these problems, for example, using an edge mask as shown in Patent Document 3, a current flowing between the metal band 101 and the electrode 131 is partially applied at the end of the metal band 101 in the plate width direction. A method of blocking is also proposed. However, when an edge mask is used, there is an additional increase in apparatus cost, and when the metal band 101 meanders in the thickness direction, the metal band 101 comes into contact with the edge mask and wrinkles. There is a point.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to coat the surface of a metal strip with a surface coating such as an electrically insulating coating by electrolysis of an electrolytic solution. It is an object of the present invention to provide a metal surface continuous surface treatment method and a continuous surface treatment apparatus that make it possible to make the distribution of the coating amount in the width direction of the metal belt uniform.

  In order to solve the above-mentioned problems, the present inventor has invented the following continuous surface treatment method and continuous surface treatment apparatus for metal bands after extensive studies.

1st invention is the metal surface continuous surface treatment method which coat | covers an electrically insulating film by electrolysis of electrolyte solution on the surface of the metal belt conveyed continuously, The said metal band which should coat | cover the said electrically insulating film An anode electrode is disposed opposite to the surface to be processed, and the electrolyte solution in a laminar flow is sprayed from the anode electrode to the surface to be processed of the metal band, the metal band is a cathode, and the anode electrode is an anode As described above, a voltage is applied between them, and electricity is passed through an electrolyte as a laminar flow sprayed from the anode electrode.
According to a second aspect of the present invention, in the step of disposing the anode electrode in the first aspect, further disposing a cathode electrode opposite to one side of the metal strip and injecting the electrolyte solution, In the step of injecting an electrolyte solution that becomes a laminar flow from the cathode electrode to the opposite side of the metal strip, and injecting an electrolyte solution that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip, A voltage is applied between the cathode electrode as a cathode and the anode electrode as an anode, and electricity is passed through the sprayed electrolyte solution as a laminar flow and the metal strip.
According to a third invention, in the first invention, in the step of disposing the anode electrode, a conductor roll that can be energized in contact with the metal band is further disposed, and in the step of energizing, the conductor roll is a cathode, The anode electrode is used as an anode, a voltage is applied between them, and current is passed through the sprayed electrolyte solution as a laminar flow and the metal strip.
According to a fourth invention, in any one of the first to third inventions, the electrolytic solution is a fluorine ion having a molar ratio of 4 times or more with respect to a metal ion and the metal ion, or a metal and the metal. It is characterized by being a pH 2-7 aqueous solution containing any one or more of complex ions containing fluorine at a molar ratio of 4 times or more.
5th invention is the to-be-processed surface of the said metal band which should coat | cover the said plating film in the continuous surface treatment method of the metal band which coat | covers a plating film by electrolysis of electrolyte solution on the surface of the metal band conveyed continuously An anode electrode is disposed opposite to the anode electrode, and the electrolyte solution that forms a laminar flow is sprayed from the anode electrode to the surface to be processed of the metal strip. The metal strip serves as a cathode and the anode electrode serves as an anode. A voltage is applied to pass through the electrolyte as a laminar flow sprayed from the anode electrode.
According to a sixth invention, in the fifth invention, in the step of disposing the anode electrode, further disposing a cathode electrode opposite to one side of the metal strip, and in the step of injecting the electrolytic solution, In the step of injecting an electrolyte solution that becomes a laminar flow from the cathode electrode to the opposite side of the metal strip, and injecting an electrolyte solution that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip, A voltage is applied between the cathode electrode as a cathode and the anode electrode as an anode, and electricity is passed through the sprayed electrolyte solution as a laminar flow and the metal strip.
According to a seventh invention, in the fifth invention, in the step of disposing the anode electrode, a conductor roll that can be energized in contact with the metal band is further disposed, and in the step of energizing, the conductor roll is a cathode, The anode electrode is used as an anode, a voltage is applied between them, and current is passed through the sprayed electrolyte solution as a laminar flow and the metal strip.
According to an eighth aspect of the present invention, in the seventh aspect, in the step of disposing the anode electrode, a plurality of electrode groups each composed of a set of the anode electrode and the conductor roll are disposed in the transport direction of the metal strip. .
According to a ninth invention, in any one of the fifth to eighth inventions, the electrolytic solution is a plating solution containing metal ions.
According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects of the invention, in the step of disposing the anode electrode, both sides of the metal strip to be conveyed are the treated surface. An anode electrode is disposed opposite to the surface to be processed on both sides of the band.
The eleventh aspect of the invention is a metal strip continuous surface treatment apparatus for coating a surface of a continuously conveyed metal strip with an electrolysis of an electrolytic solution, wherein the electrical insulating coating is to be coated. An anode electrode disposed opposite to the surface to be treated of the metal strip, and a laminar nozzle provided on the anode electrode and for injecting an electrolyte solution that forms a laminar flow from the anode electrode to the surface to be treated of the metal strip; And a voltage applying means for applying a voltage between the metal strip as a cathode and the anode electrode as an anode and energizing the electrolyte as a laminar flow ejected from the laminar nozzle. .
A twelfth aspect of the present invention is the eleventh aspect of the present invention, further comprising a cathode electrode disposed opposite to one side of the metal strip, wherein the cathode electrode is opposite to the single side of the metal strip from the cathode electrode. A laminar nozzle for injecting an electrolyte solution in a laminar flow, and the voltage applying means applies the voltage between the cathode electrode as a cathode and the anode electrode as an anode, and the cathode electrode and the anode It is characterized in that electricity is passed through the electrolytic solution as a laminar flow ejected from a laminar nozzle of the electrode and the metal strip.
A thirteenth invention is the eleventh invention, further comprising a conductor roll that can be energized in contact with the metal strip, and the voltage application means uses the conductor roll as a cathode and the anode electrode as an anode to apply a voltage therebetween. It is applied and energized through the electrolytic solution as a laminar flow ejected from the laminar nozzle and the metal strip.
In a fourteenth aspect of the present invention based on any one of the eleventh aspect to the thirteenth aspect of the present invention, the electrolytic solution is a fluorine ion having a molar ratio of at least four times the metal ion and the metal ion, or a metal and the metal. It is characterized by being a pH 2-7 aqueous solution containing any one or more of complex ions containing fluorine at a molar ratio of 4 times or more.
According to a fifteenth aspect of the present invention, there is provided a continuous metal strip surface treatment apparatus for coating a plating film on a surface of a continuously transported metal band by electrolysis of an electrolytic solution. An anode electrode disposed opposite to the treatment surface, a laminar nozzle provided on the anode electrode, and for injecting an electrolyte solution that forms a laminar flow from the anode electrode onto the treatment surface of the metal strip, and the metal strip And a voltage applying means for applying a voltage between them using the anode electrode as an anode and energizing the electrolyte solution as a laminar flow ejected from the laminar nozzle.
A sixteenth invention is the fifteenth invention, further comprising a cathode electrode disposed opposite to one side of the metal strip, wherein the cathode electrode faces the one side of the metal strip opposite to the cathode electrode. A laminar nozzle for injecting an electrolyte solution in a laminar flow, and the voltage applying means applies the voltage between the cathode electrode as a cathode and the anode electrode as an anode, and the cathode electrode and the anode It is characterized in that electricity is passed through the electrolytic solution as a laminar flow ejected from a laminar nozzle of the electrode and the metal strip.
In a fifteenth aspect of the present invention, the electric power supply according to the fifteenth aspect of the present invention further includes a conductor roll that can be energized in contact with the metal strip, and the voltage application means uses the conductor roll as a cathode and the anode electrode as an anode to apply a voltage therebetween. It is applied and energized through the electrolytic solution as a laminar flow ejected from the laminar nozzle and the metal strip.
According to an eighteenth aspect, in the seventeenth aspect, a plurality of electrode groups each composed of a set of the anode electrode and the conductor roll are arranged in the transport direction of the metal strip.
A nineteenth invention is characterized in that, in any one of the fifteenth to eighteenth inventions, the electrolytic solution is a plating solution containing metal ions.
According to a twentieth aspect of the present invention, in the invention according to any one of the eleventh to nineteenth aspects of the present invention, both sides of the metal strip to be transported are the surfaces to be processed, and the anode electrode is coated on both sides of the metal strip. It arrange | positions facing the process surface, It is characterized by the above-mentioned.

According to the first to twentieth inventions, a voltage is applied between the electrode and the metal strip while injecting an electrolyte solution that becomes a laminar flow from the electrode to the metal strip. When the surface to be treated of the band is coated with a surface film such as an electrically insulating film or a plating film, the electrolytic solution can be electrolyzed without immersing the metal band in the electrolyte. For this reason, it becomes possible to coat the surface of the metal band while suppressing current concentration at the end of the metal band in the plate width direction, and to that extent, the coating amount of the metal band in the plate width direction is uniform. Can be achieved. In addition, since the electrolysis is performed using an electrolyte that becomes a laminar flow, almost no current flows to the metal band from the laminar flow that does not collide with the metal band and tries to pass through both sides of the plate width direction. This also makes it possible to suppress current concentration at the end of the metal strip in the plate width direction. In addition, while the electrolysis of the electrolyte is in progress, a new electrolyte is sprayed onto the surface to be treated of the metal strip, so that the concentration of metal ions and complex ions contributing to the electrolysis is constant. Electrolysis can proceed as it is, and it is possible to make the coating amount uniform in the plate width direction of the metal band, and dirt or the like is attached to the treated surface of the metal band. In addition, it is possible to coat the surface coating while washing and removing it. In addition, since it is possible to proceed with the electrolysis of the electrolyte without immersing the metal strip in the electrolyte, it is possible to suppress the current from flowing to one side of the metal strip opposite to the surface to be treated. In addition, it is possible to suppress the occurrence of a leakage current that flows only from the anode to the cathode through the electrolytic solution, and it is not necessary to store a large amount of the electrolytic solution in the electrolytic cell.
According to the second invention, the sixth invention, the twelfth invention, and the sixteenth invention, since the conductor roll is not used as an electrode, a spark wrinkle is generated by a spark generated by local contact between the conductor roll and the metal strip. It is possible to prevent this.
According to the eighth and eighteenth inventions, it is possible to increase the amount and speed of coating the plating film on the surface to be treated of the metal band, and to coat the plating film at high speed.

It is side surface sectional drawing which shows schematically the structure of the continuous surface treatment apparatus which concerns on 1st Embodiment. It is a figure which shows the example of the voltage applied by the power supply device which concerns on 1st Embodiment. It is a top view which shows typically the structure of the anode electrode which concerns on 1st Embodiment. It is side surface sectional drawing which shows typically the operation state of the cathode electrode which concerns on 1st Embodiment, and an anode electrode. It is front sectional drawing which shows typically the operation state of the anode electrode which concerns on 1st Embodiment. It is side surface sectional drawing which shows schematically the structure of the continuous surface treatment apparatus which concerns on 2nd Embodiment. It is side surface sectional drawing which shows roughly the operation state of the cathode electrode which concerns on 2nd Embodiment, and an anode electrode. It is front sectional drawing which shows typically the operation state of the anode electrode which concerns on 2nd Embodiment. It is side surface sectional drawing which shows typically the operation state of the cathode electrode which concerns on 3rd Embodiment, and an anode electrode. It is side surface sectional drawing which shows schematically the structure of the continuous surface treatment apparatus in case the electrode group which consists of a pair of a conductor roll and an electrode is arrange | positioned by the conveyance direction. It is a figure which shows the measurement result of the film adhesion amount of the metal strip obtained by performing the coating process of an electrically insulating film on the operating conditions of Example 1. FIG. It is a figure which shows the measurement result of the film adhesion amount of the metal strip obtained by performing a tin plating process on the operating conditions of Example 2. FIG. It is side surface sectional drawing which shows the structure of the conventional continuous surface treatment apparatus roughly.

  The present inventor has made it possible to make the coating amount of the metal strip uniform in the plate width direction when the surface of the metal strip is coated with a surface coating such as an electrically insulating coating by electrolysis of the electrolytic solution. The surface treatment method was studied earnestly. As a result, the metal strip is not soaked in the electrolyte solution, and a voltage is applied between the anode electrode and the metal strip while spraying the electrolyte solution that becomes a laminar flow from the anode electrode to the metal strip. It has been found that a surface coating can be applied to the surface of the metal band while suppressing current concentration at the end of the band in the plate width direction.

  The present invention has been devised based on such examination contents. Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  In the continuous surface treatment method according to the present invention, a surface film such as an electrically insulating film or a conductive plating film is coated on the surface of a continuously conveyed metal strip by electrolysis of an electrolytic solution. In the continuous surface treatment method according to the present invention, when an electrically insulating film or a plated film is coated, depending on which of these is coated on the surface of the metal strip, the type of electrolytic solution, the configuration of the continuous surface treatment apparatus, etc. Is different. Therefore, first, a continuous surface treatment method for coating the surface of the metal strip with the electrically insulating coating will be described, and then, a continuous surface treatment method for coating the surface of the metal strip with the plating coating will be described.

  First, a first embodiment of the present invention will be described. FIG. 1 is a side sectional view schematically showing a configuration of a continuous surface treatment apparatus 3 for realizing the continuous surface treatment method according to the first embodiment of the present invention.

  The metal strip 1 to which the present invention is applied is continuously conveyed by a conductor roll 81 or the like. One or both sides of the metal strip 1 are conveyed as a surface to be processed 1a to be coated with an electrically insulating coating, and in the first embodiment, only the upper surface is conveyed as the surface to be processed 1a. ing. The metal strip 1 is made of, for example, a steel material such as ordinary steel or stainless steel, or a metal material such as titanium or an alloy thereof. The present invention, when the metal strip 1 is made of a steel material, does not particularly limit at which point in the manufacturing process of the steel material, for example, hot rolling, cold rolling or surface cleaning Used later.

  The continuous surface treatment apparatus 3 includes an anode electrode 33 disposed opposite to the surface 1a to be treated of the metal strip 1. In the first embodiment, the continuous surface treatment apparatus 3 further includes a cathode electrode 31 disposed opposite to the surface to be treated 1 a of the metal strip 1 and disposed on the entry side in the transport direction P from the anode electrode 33.

  In the first embodiment, the continuous surface treatment apparatus 3 is connected between a cathode electrode 31 and an anode electrode 33 with a power supply device 41 as a voltage application means for applying a voltage therebetween. In the first embodiment, the power supply device 41 is configured to apply a DC voltage as shown in FIG. The power supply device 41 is configured, for example, from a six-phase AC power source that rectifies a six-phase half-wave and applies a DC voltage. However, the configuration is not particularly limited as long as a voltage can be applied, and the method is also The transistor system, the inverter system, etc. are not particularly limited.

  In the first embodiment, a switch 43 is connected between the cathode electrode 31 and the power supply device 41, and a resistor 45 is connected between the power supply device 41 and the anode electrode 33. By closing the switch 43, a voltage is applied between the cathode electrode 31 and the anode electrode 33, and by applying the switch 43, the voltage application between them is interrupted. Further, by increasing or decreasing the value of the resistor 45, the current value of the current passed between the cathode electrode 31 and the anode electrode 33 is adjusted.

  3 is a plan view schematically showing the configuration of the anode electrode 33, FIG. 4 is a side sectional view showing the operating state of the cathode electrode 31 and the anode electrode 33, and FIG. 5 is a front view showing the operating state of the anode electrode 33. It is sectional drawing. In addition, since the structure of the cathode electrode 31 is the same as that of the anode electrode 33 in 1st Embodiment, the structure of the cathode electrode 31 is also demonstrated collectively based on FIG. 3, FIG. Further, in FIG. 5, the electrolyte solution injected as a laminar flow Wr from the laminar nozzle 39 provided on the anode electrode 33 is omitted, and only a range in which the electrolyte solution is injected is schematically illustrated.

  In the first embodiment, the cathode electrode 31 and the anode electrode 33 are a plate-like electrode plate 35 disposed substantially parallel to the transport direction P of the metal strip 1 and the side of the electrode plate 35 facing the metal strip 1. Further, one or more cylindrical headers 37 provided in parallel with a gap in the transport direction P of the metal strip 1 and a laminar nozzle 39 provided on the header 37 are provided.

  The electrode plate 35 is connected to a power supply wiring 47 that is electrically connected to the power supply device 41 in order to apply a voltage.

  In the first embodiment, the header 37 is connected to an end portion of an electrolyte supply branch 53 for supplying the electrolyte W therein. In the first embodiment, the electrolyte supply branch pipe 53 is branched from an electrolyte supply main pipe 51 that is disposed on both sides in the plate width direction of the electrode plate 35 so as to extend in the transport direction P of the metal strip 1. In the middle of the piping of the electrolyte supply branch pipe 53, a branch pipe flow rate adjustment valve 55 is connected in order to adjust the injection amount of the electrolyte W from the laminar nozzle 39 in the first embodiment. By adjusting the opening of the valve 55, the supply amount of the electrolyte supplied from the electrolyte supply main pipe 51 to the header 37 through the electrolyte supply branch pipe 53 is adjusted.

  The laminar nozzle 39 functions as an electrolytic solution ejecting unit that ejects an electrolytic solution that forms a laminar flow Wr from the cathode electrode 31 and the anode electrode 33 onto the surface 1a to be processed of the metal strip 1. Here, the laminar flow Wr is a flow having a thickness and a width with respect to a direction perpendicular to the direction in which the electrolytic solution is jetted, and the electrolytic solution is filled in the flow. The shape in the range from when it is further injected until it collides with the metal strip 1 refers to a flow that is substantially uniform over time. In the first embodiment, the laminar nozzle 39 is configured to have a slit-like injection port 39a for injecting a film-like laminar flow Wr, but in addition to this, a columnar laminar flow is injected. You may be comprised from what has the cylindrical injection port to do.

  In addition, in the first embodiment, the cathode electrode 31 and the anode electrode 33 are illustrated in which the electrode plate 35, the header 37, and the laminar nozzle 39 are integrally configured. The laminar nozzle 39 may be configured as a separate body and connected to each other. Further, the cathode electrode 31 and the anode electrode 33 are not particularly limited as long as the cathode electrode 31 and the anode electrode 33 can be energized to the electrolyte sprayed from the laminar nozzle 39. For example, only the header 37 is an electrode described later. The electrode plate 35 may be used without using the electrode plate 35.

  Further, since the cathode electrode 31 only needs to be able to energize the metal strip 1 through the electrolytic solution that becomes the laminar flow Wr, the cathode electrode 31 only needs to be disposed opposite to one side of the metal strip 1. However, the present invention is not limited to one disposed opposite to one surface to be processed 1a. For the same reason, when the cathode electrode 31 is disposed opposite to the surface 1a to be processed of the metal band 1, the metal band 1 through the electrolytic solution in which the electrically insulating coating becomes the laminar flow Wr. It is necessary to be disposed on the entrance side in the transport direction P from the anode electrode 33 so as not to hinder energization of the electrode. On the other hand, when only one surface of the metal strip 1 is the surface 1a to be processed and the cathode electrode 31 is disposed opposite to the one surface opposite to the surface 1a to be processed, the anode The arrangement position of the cathode electrode 31 with respect to the electrode 33 is not particularly limited.

  Moreover, the continuous surface treatment apparatus 3 is provided with the electrolytic vessel 61 for storing the electrolyte solution sprayed from the laminar nozzle 39 to the to-be-processed surface 1a in the first embodiment. In the electrolytic cell 61, after being injected from the laminar nozzle 39, the electrolytic solution falls as a droplet Wb from both sides in the plate width direction after colliding with the metal strip 1, or falls without colliding with the metal strip 1. Electrolyte to be stored is stored. In the electrolytic bath 61, the electrolytic solution sprayed from the laminar nozzle 39 accumulates and accumulates as Wa at the bottom 61 a, so that the metal strip 1 is not immersed in the electrolytic solution as the accumulated Wa stored in the electrolytic bath 61. It is conveyed to.

  In the first embodiment, the electrolytic solution accumulated at the bottom 61 a of the electrolytic cell 61 is discharged through the discharge pipe 63 connected to the electrolytic tank 61 and is stored in the storage tank 64 connected to the discharge pipe 63. Accumulated. In the first embodiment, an electrolyte supply main pipe 51 is connected to the storage tank 64. In the middle of the piping of the electrolytic solution supply main pipe 51, in the first embodiment, an electrolytic solution supply pump 65 for transferring the electrolytic solution, an electrolytic solution filter 66 for filtering the electrolytic solution, and an electrolytic solution supply main pipe A main flow rate adjusting valve 67 for adjusting the amount of electrolyte supplied to 51 is connected. The electrolytic solution stored in the storage tank 64 is transferred to the electrolytic solution supply main pipe 51 through the electrolytic solution filter 66 by driving of the electrolytic solution supply pump 65, and then again to the metal strip 1 through the header 37 and the laminar nozzle 39. It is used in a circulating manner so as to be injected.

  In the first embodiment, a shielding plate 71 made of an electrically insulating material such as urethane rubber is disposed between the cathode electrode 31 and the anode electrode 33 in order to suppress discharge from the cathode electrode 31 to the anode electrode 33. It is installed.

  In the first embodiment, a pair of ringer rolls 81 are arranged on the entry side and the exit side of the electrolytic cell 61 with the metal band 1 interposed therebetween as the conveyance roll 81 for continuously conveying the metal band 1. The electrolytic solution is prevented from flowing out of the electrolytic cell 61.

  Moreover, the cathode electrode 31, the anode electrode 33, and the shielding board 71 are arrange | positioned in the state supported by the electrolytic vessel 61 through the electrically insulating material which is not shown in figure, for example.

  Next, the electrolytic solution W in the first embodiment will be described.

As the electrolytic solution W, an aqueous solution having a pH of 2 to 7 containing at least one of the following (1) and (2) is used when the surface 1a of the metal strip 1 is coated with an electrically insulating coating.
(1) Metal ions and fluorine ions having a molar ratio of 4 times or more with respect to the metal ions (2) Complex ions including metal and fluorine having a molar ratio of 4 times or more with respect to the metal

In such an electrolytic solution W, a reversible reaction represented by, for example, the following formulas (11) and (12) occurs between a metal ion or a complex ion containing a metal and an oxide or hydroxide. Has occurred.
TiF ₆ ²⁻ + 2H ₂ O Ｔｉ TiO ₂ + 4H ⁺ + 6F ⁻ (11)
SiF ₆ ²⁻ + 4H ₂ O Ｓｉ Si (OH) ₄ + 4H ⁺ + 6F ⁻ (12)

  As the aqueous solution that realizes the state represented by the left side of the mathematical formulas (11) and (12), the following two types are conceivable.

First, an aqueous solution containing TiF ₆ ²⁻ or SiF ₆ ²⁻ on the left side as metal ions such as (Ti ⁴⁺ + 6F ⁻ ) or (Si ⁴⁺ + 6F ⁻ ) and fluorine ions, that is, the above-mentioned (1 ). The second is an aqueous solution containing TiF ₆ ^2- or SiF ₆ ^2- itself on the left side, that is, an aqueous solution containing the above-mentioned (2).

  Here, in the above-mentioned reversible reaction, since hydrogen ions and fluorine ions are contained on the right side thereof, the consumption of these hydrogen ions and fluorine ions causes the equilibrium state to be lost, and the oxides and hydroxides. The production amount will increase.

Therefore, if hydrogen ions are actively consumed on the surface of the metal strip 1 by utilizing the electrolysis of the electrolyte W, the formation of an oxide or hydroxide film on the surface of the metal strip 1 is promoted. It becomes possible to coat the surface of the metal strip 1 in a short time. Examples of the oxide to be coated at this time include TiO ₂ , ZrO ₂ , SiO ₂ , MgO, Al ₂ O ₃ , ZnO, NiO, and CoO. Examples of the hydroxide include Si (OH). ₄ , Al (OH) ₃ , Zr (OH) ₄ , Nb (OH) ₅ , Ta (OH) _{5 and the} like.

When the surface of the metal strip 1 is covered with a hydroxide film, a subsequent condensation reaction proceeds by, for example, the following formula (13) by drying, and SiO ₂ , Al ₂ It exists as an oxide film of O ₃ , ZrO ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ or the like.
Si (OH) ₄ -2H ₂ O → SiO ₂ (13)

At this time, if aluminum ions or boron ions that generate a stable fluoride are contained in the electrolytic solution W, for example, a reaction represented by the following formula (14) proceeds. Thereby, consumption of fluorine ions is promoted, and it becomes possible to further promote the formation of an oxide or hydroxide film.
_{^{Al 3+ + 6F - → AlF 6}} 2- ··· (14)

  Hereinafter, the electrolytic solution W will be described in more detail.

  The reason why the pH of the electrolytic solution W is set to 2 or more is that when the pH is less than 2, excessive hydrogen is generated from the treated surface 1a of the metal strip 1 due to the cathode reaction and the formation of the coating is likely to be inhibited. is there. Moreover, the reason why the pH of the electrolytic solution W is set to 7 or less is that when the pH is more than 7, the cohesive strength of the coating film may be insufficient due to the formation of aggregates in the aqueous solution. The pH of the electrolytic solution W is preferably 3 or more in order to more reliably suppress the generation of excessive hydrogen, and is preferably 7 or less in order to more reliably suppress aggregation in the aqueous solution.

  The reason why the molar ratio of fluorine in the fluorine ion or complex ion is set to 4 times or more is that when it is less than 4 times, the formation of the coating film may not proceed.

  Examples of metal ions and complex ions in the electrolyte W include metal ions and metals such as Ti, Si, Zr, Fe, Sn, and Nd, but are not particularly limited.

  In order to contain fluorine ions in the electrolytic solution W, hydrofluoric acid, hydrofluoric acid salt, or the like may be dissolved in a solvent. In addition, as hydrofluoric acid salt here, the ammonium salt, potassium salt, sodium salt, etc. of hydrofluoric acid are mentioned, for example. Incidentally, when a salt is used, the saturation solubility varies depending on the cation species, thereby affecting the film formation rate.

  In order to contain complex ions in the electrolytic solution W, hexafluorotitanic acid, hexafluorosilicic acid, hexafluorozirconic acid, hexafluoroniobic acid, and salts thereof may be dissolved in a solvent. In addition, as salt here, such as hexafluoro titanic acid, these ammonium salt, potassium salt, sodium salt, etc. are mentioned. The complex ions may contain elements other than metals and fluorine.

  In addition, in order to accelerate | stimulate the production | generation of a film, in the electrolyte solution W, the aluminum ion and boron ion which produce | generate a stable fluoride may contain.

  In addition, a method for replenishing metal ions, fluorine ions, and complex ions consumed by electrolysis is provided, for example, by separately providing a dissolution tank in which metal ions consumed by electrolysis are dissolved. This is performed by a known method such as circulating the electrolyte W between the tank 64 and the like. Moreover, although it is the adjustment method of pH of electrolyte solution, this is performed by well-known methods, such as injection | pouring of pH adjusters, such as an inorganic acid, organic acid, sodium hydroxide, ammonium, etc., for example.

  Next, the material of the cathode electrode 31 and the anode electrode 33 in the first embodiment will be described.

  When coating the surface 1a to be treated of the metal strip 1 with an electrically insulating coating, the cathode electrode 31 is used from the viewpoint of preventing adverse effects caused by reaction with insoluble electrode materials such as Pt and metal ions in the electrolyte W. And a soluble electrode material made of the same metal as the metal ions in the electrolyte W. The anode electrode 33 is preferably made of aluminum or the like in order to contain metal ions for generating a stable fluoride in the electrolyte W. However, the anode electrode 33 is preferably made of an insoluble electrode material such as Pt or the same reason as described above. Therefore, it may be composed of a soluble electrode material made of the same metal as the metal ions in the electrolyte W.

  Next, the continuous surface treatment method according to the first embodiment of the present invention will be described.

  First, an electrolytic solution that forms a laminar flow Wr is sprayed from the anode electrode 33 to the treated surface 1 a of the metal strip 1 that is continuously conveyed by the laminar nozzle 39. At this time, in the first embodiment, an electrolytic solution that forms a laminar flow Wr is also ejected from the cathode electrode 31 by the laminar nozzle 39.

  Subsequently, a voltage is applied between the power supply device 41 as a voltage application means so that the metal strip 1 becomes a cathode and the anode electrode 33 becomes an anode. In the first embodiment, the voltage is actually applied so that the cathode electrode 31 is a cathode and the anode electrode 33 is an anode. At this time, in the first embodiment, as described above, a constant voltage as shown in FIG. 2 is applied.

  Thereby, in 1st Embodiment, the electrolyte solution of the laminar flow Wr inject | poured from the power supply device 41-cathode electrode 31-cathode electrode 31 of the laminar flow Wr-metal strip 1-anode electrode 33 A closed circuit of the anode electrode 33 and the power supply device 41 is formed, and a current is passed through them.

At this time, a voltage is applied between the anode electrode 33 and the metal band 1 opposite to the anode electrode 33 with the metal band 1 as a cathode and the anode electrode 33 as an anode. Then, hydrogen ions are consumed by the progress of the cathode reaction represented by the following formula (21). As a result, as described above, the equilibrium state of the reversible reaction between the metal ion or the complex ion containing the metal and the oxide or hydroxide is broken, and the oxide or hydroxide is formed on the surface of the metal band 1. Will be covered.
2H ⁺ + 2e ⁻ → H ₂ ↑ (21)

In addition, at this time, when the anode electrode 33 is comprised from soluble materials, such as aluminum, the anode reaction represented by following Numerical formula (31) advances, As a result, it represents with said Numerical formula (14). By promoting such a reaction, it contributes to an increase in the production rate of the oxide or hydroxide coating. Moreover, when the anode electrode 33 is comprised from insoluble metal materials, such as Pt, the anode reaction represented by following Numerical formula (32) will advance.
Me → Me ⁺ + e ⁻ (31)
(When the anode 33 is Al: Al → Al ³⁺ + 3e ⁻ )
2H ₂ O → 4H ⁺ + 2O ₂ ↑ + 4e ⁻ (32)

  At this time, by changing the resistance value of the resistor 45, the length of the anode electrode 33 in the transport direction P, and the like, the current value and the energization time can be adjusted. The generation speed, that is, the film thickness is adjusted.

  In the first embodiment, since the electrolytic solution is circulated through the electrolytic solution filter 66, the electrolytic solution from which dirt or the like has been removed is sprayed onto the surface 1a to be processed of the metal strip 1.

  According to the first embodiment described above, the voltage is applied between the anode electrode 33 and the metal strip 1 while the electrolyte solution that becomes the laminar flow Wr is sprayed from the anode electrode 33 onto the metal strip 1. When the surface 1a to be treated of the metal strip 1 is coated with the electrically insulating film by electrolysis of the liquid, the electrolysis of the electrolytic solution can proceed without immersing the metal strip 1 in the electrolytic solution. For this reason, it becomes possible to coat the surface of the metal band 1 with an electrically insulating coating while suppressing current concentration at the end of the metal band 1 in the plate width direction. It is possible to make the coating amount uniform.

  Moreover, according to 1st Embodiment, since it electrolyzes using the electrolyte solution used as the laminar flow Wr, also by the reason demonstrated below, the electric current in the plate width direction edge part of the metal strip 1 is demonstrated. It is possible to suppress concentration. In the first embodiment, the electrolyte solution as the laminar flow Wr is injected from the laminar nozzle 39 on the upper side of the metal strip 1, but the electrolyte solution as the laminar flow Wr thus injected is applied to the laminar nozzle 39. The lower the position, the faster the falling speed, and the thickness and width are deformed due to the surface tension. At this time, the laminar flow, which is located in the range S in FIG. 5 and does not collide with the metal band 1 and tries to pass through both sides in the plate width direction, is not restrained by the metal band 1, and its thickness and Due to the fact that the width is small, the flow is unstable and often partly divided. As a result, almost no current flows from the electrolytic solution as the laminar flow Wr which attempts to pass through both sides of the plate width direction without colliding with the metal band 1 to the metal band 1, thereby the plate width of the metal band 1. It is possible to suppress current concentration at the end of the direction.

  In addition, according to the first embodiment, while the electrolytic solution is being electrolyzed, a new electrolytic solution is sprayed onto the surface 1a to be treated of the metal strip 1, so that electrolysis that consumes metal ions and complex ions is performed. The liquid is continuously removed from the vicinity of the treated surface 1a of the metal strip 1. For this reason, the electrolysis can be allowed to proceed while the concentration of metal ions and complex ions in the electrolytic solution contributing to the electrolysis is constant, and accordingly, the coating of the metal strip 1 in the plate width direction. It is possible to make the amount of adhesion uniform. In addition, this makes it possible to cover the surface 1a of the metal strip 1 with dirt and the like while washing and removing the dirt while coating the electrically insulating film. It is possible to prevent a coating failure from occurring.

  In addition, according to the first embodiment, since it is possible to proceed the electrolysis of the electrolytic solution without immersing the metal strip 1 in the electrolytic solution, the metal strip 1 on the side opposite to the surface to be treated 1a. It is possible to suppress the current from flowing to one side, and thus it is possible to prevent the electrically insulating coating from being coated on the one side opposite to the surface to be processed 1a. This also makes it possible to suppress the occurrence of leakage current that flows only from the anode to the cathode through the electrolyte. This also eliminates the need to store a large amount of electrolytic solution in the electrolytic cell, thereby reducing the processing cost.

  Moreover, according to 1st Embodiment, since the conductor roll 81 is not utilized as an electrode, it can prevent that a spark wrinkle generate | occur | produces by the spark which generate | occur | produces by the local contact of the conductor roll 81 and the metal strip 1. Is possible.

  Next, a second embodiment of the present invention will be described. In the second and subsequent embodiments, the same components as those described above are denoted by the same reference numerals, and the following description is omitted.

  FIG. 6 is a side sectional view schematically showing the configuration of the continuous surface treatment apparatus 3 for realizing the continuous surface treatment method according to the second embodiment, and FIG. 7 is a cathode electrode 31 according to the second embodiment. FIG. 8 is a side cross-sectional view schematically showing the operation state of the anode electrode 33, and FIG. 8 is a plan cross-sectional view schematically showing the operation state of the upper and lower anode electrodes 33 according to the second embodiment. In FIG. 8, the electrolyte solution injected as a laminar flow Wr from the laminar nozzles 39 provided on the upper and lower anode electrodes 33 is omitted, and only the range in which the lower electrolyte solution is injected is schematically illustrated.

  The continuous surface treatment method according to the second embodiment exemplifies a method applied when both surfaces of the metal strip 1 are treated surfaces 1a and an electrically insulating film is coated. In the continuous surface treatment apparatus 3 according to the second embodiment, an electrode group 30 composed of a set of a cathode electrode 31 and an anode electrode 33 is disposed opposite to both surfaces of the metal strip 1. Further, one power supply device 41 is connected to each electrode group 30.

  Next, the continuous surface treatment method according to the second embodiment will be described. In the second and subsequent embodiments, only steps different from the continuous surface treatment method according to the first embodiment will be described, and descriptions of similar steps will be omitted.

  In the continuous surface treatment method according to the second embodiment, the speed when the electrolyte solution that forms the laminar flow Wr is ejected from the cathode electrode 31 and the anode electrode 33 to the lower surface 1a of the metal strip 1 by the laminar nozzle 39. Is adjusted in advance so as to have the minimum and necessary energy for colliding with the lower surface of the metal strip 1. Thereby, the laminar flow Wr located on the lower side of the metal band 1 is stably in contact with the lower surface of the metal band 1 due to the surface tension between the lower surface of the metal band 1 and the upper part of the laminar flow Wr. become. And the laminar flow which tries to pass the both sides of the plate | board width direction, without colliding with the metal strip | belt 1 located in the range S in FIG. 8, does not reach the height of the lower surface of the metal strip | stamp 1 stably. Become. As a result, almost no current flows to the metal band 1 from the electrolyte as the laminar flow Wr that attempts to pass through both sides of the plate width direction without colliding with the metal band 1, thereby Current concentration at the end in the plate width direction is suppressed.

  In addition, since the shape of the electrolyte injected as the laminar flow Wr from the upper laminar nozzle 39 of the metal band 1 is more stable than that injected from the lower laminar nozzle 39, only one side of the metal band 1 is applied. In the case of the surface 1a to be treated, it is preferable to dispose the electrodes 31, 33 and the laminar nozzle 39 on the upper side of the metal strip 1 in order to stably coat the coating.

  Next, a third embodiment of the present invention will be described.

  FIG. 9 is a side cross-sectional view schematically showing the configuration of the continuous surface treatment apparatus 3 according to the third embodiment.

  The continuous surface treatment apparatus 3 according to the third embodiment is used as an electrode that becomes a cathode when the conductor roll 81 used in the continuous surface treatment apparatus 3 according to the first embodiment energizes the metal strip 1. Specifically, the continuous surface treatment apparatus 3 according to the third embodiment includes an anode electrode 33 disposed opposite to the surface to be treated 1a of the metal strip 1, and an entrance side in the transport direction P from the anode electrode 33. And a conductor roll 81 that is in contact with the metal strip 1 and can be energized. The metal strip 1 is conveyed while being guided by the conductor roll 81.

  The conductor roll 81 is only required to be able to energize the metal strip 1 in the same manner as described for the cathode electrode 31. Therefore, the conductor roll 81 only needs to be disposed in contact with one side of the metal strip 1, and the metal strip It is not limited to the one disposed in contact with the surface 1a to be treated. For the same reason, when the conductor roll 81 is disposed in contact with the surface to be treated 1a of the metal band 1, the electrically insulating film does not interfere with the energization of the metal band 1. It is necessary to be disposed on the entry side in the transport direction P from the anode electrode 33. On the other hand, when only one surface of the metal strip 1 is the surface 1a to be processed and the conductor roll 81 is disposed in contact with the one surface opposite to the surface 1a to be processed, the anode electrode The arrangement position of the conductor roll 81 with respect to 33 is not particularly limited.

  Further, in the continuous surface treatment apparatus 3 according to the third embodiment, a power supply apparatus 41 is connected between the anode electrode 33 and the conductor roll 81 as voltage applying means for applying a voltage therebetween.

  Next, a continuous surface treatment method according to the third embodiment will be described.

  In the third embodiment, when a voltage is applied between the power supply device 41 so that the metal strip 1 is a cathode and the anode electrode 33 is an anode, the conductor roll 81 is actually a cathode and the anode electrode 33 is A voltage is applied so as to be an anode.

  The case where the surface to be treated 1a of the metal band 1 is coated with the electrically insulating film has been described above. Next, the case where the surface of the metal band 1 is coated with the plating film will be described.

  When the plating surface is coated on the treated surface 1a of the metal band 1, the case where the electrically insulating film is coated mainly in terms of the electrolytic solution W, the cathode electrode 31, the anode electrode 33, and the reaction content by electrolysis. Unlikely, the configuration of the continuous surface treatment apparatus 3 is the same as that described in the first to third embodiments.

  As the electrolytic solution W, when the electrolytic solution W is used as a supply source of metal ions for forming a plating film, a known plating solution containing the metal ions is used. Examples of the plating solution include those containing metal ions selected from Sn, Zn, Ni, Cr, Au, Cu, Ag, Al, Si, Mg, Mn, Co, and the like. Further, when the anode electrode 33 itself is used as the supply source of metal ions for forming the plating film, the electrolyte solution W is not particularly limited in its components.

  The cathode electrode 31 and the anode electrode 33 are made of an insoluble electrode material such as Pt, for example, when the electrolytic solution W is used as a supply source of metal ions for forming a plating film. Further, when the anode electrode 33 itself is used as a source of metal ions for generating a plating film, the cathode electrode 31 is made of an insoluble electrode material such as Pt, and the anode electrode 33 contains the metal. Consists of

  Unlike the case where the cathode electrode 31 and the conductor roll 81 are coated with an electrically insulating film, the plating film does not hinder energization of the metal strip 1, and the arrangement position thereof with respect to the anode electrode 33 is not particularly limited.

  Next, how the electrolysis of the electrolytic solution W proceeds when a plating film is coated will be described.

In the case where a voltage is applied using the metal strip 1 as a cathode electrode and the anode electrode 33 as an anode electrode, and the electrolytic solution W is used as a source of metal ions for producing a plating film, The cathode reaction represented by the following formula (41) proceeds. Thereby, the to-be-processed surface 1a of the metal strip 1 is coated with the plating film.
Me ⁺ + e ⁻ → Me (41)
(When Me ⁺ is Zn ²⁺ : Zn ²⁺ + e ⁻ → Zn)

At this time, when the anode electrode 33 is used as a supply source of metal ions for forming a plating film, the anode reaction represented by the following formula (51) proceeds and the metal ions for forming the plating film are converted into the electrolyte W. Will be supplied inside. When the anode electrode 33 is made of an insoluble metal material such as Pt, the anode reaction represented by the following formula (52) proceeds.
Me → Me ⁺ + e ⁻ (51)
(When the electrode is Zn: Zn → Zn ²⁺ + 2e ⁻ )
2H ₂ O → 4H ⁺ + 2O ₂ ↑ + 4e ⁻ (52)

  Even when the plated surface 1a of the metal strip 1 is coated with the plating film, the same effects as those obtained when the electrically insulating film is coated can be obtained.

  As described above, the case where the surface to be treated 1a of the metal strip 1 is coated with the plating film has been described. However, in addition to this, the case where the plating film is coated may be applied to the conductor roll 81 as in the third embodiment. When energizing also, as shown in FIG. 10, a plurality of electrode groups 30 each composed of a set of the anode electrode 33 and the conductor roll 81 may be arranged in the transport direction P of the metal strip 1. In this case, one power supply device 41 is connected to each electrode group 30. Thereby, the quantity and speed | rate which coat | cover a plating film on the to-be-processed surface 1a of the metal strip 1 can be increased, and it becomes possible to coat | cover a plating film at high speed.

  Here, if the electrolytic cell 61 becomes too long in the transport direction P of the metal strip 1, the metal strip 1 is deformed into a catenary shape by its own weight, and the distance from the anode electrode 33 to the metal strip 1 is greatly different in the transport direction P. As a result, the laminar flow becomes unstable. For this reason, as shown in FIG. 10, it is preferable to arrange | position the electrolytic cell 61 in the conveyance direction P of the metal strip 1 in order. Thereby, as a result of being able to suppress the length per one electrolytic cell 61 required to coat the predetermined amount of plating film, it is possible to suppress catenary deformation of the metal strip 1 due to its own weight, It becomes possible to stabilize the laminar flow.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

  Hereinafter, the effects of the present invention will be further described with reference to examples.

  In Example 1, the continuous processing apparatus 3 according to the present invention as shown in FIG. 1 and the conventional continuous processing apparatus 103 as shown in FIG. After executing the treatment for coating the insulating coating, the amount of coating in the width direction of the electrically insulating coating coated on the surfaces of the metal bands 1 and 101 was observed to confirm the effect of the present invention. .

  Specific operating conditions in Example 1 are as follows.

As the metal strips 1 and 101, those having a material of SUS304, a plate thickness of 0.10 mm, and a plate width of 650 mm were used. As the electrolytic solution, an aqueous solution having a composition of TiCl ₄ of 0.1 mol / l and (NH ₄ ) HF ₂ of 0.3 mol / l so that the surfaces of the metal bands 1 and 101 are coated with TiO ₂ is used. The liquid temperature was set to 60 ° C. The composition of the electrolytic solution is that titanium ions and fluorine ions are in a molar ratio of 1: 6. As the cathode electrode 31 and the anode electrode 33, those whose material is Al were used. The target adhesion amount of the electrically insulating coating coated on the surfaces of the metal bands 1 and 101 is 8 mg / m ² or more, the line speed for conveying the metal bands 1 and 101 is 60 mpm, and the applied voltage is a DC voltage of 25V. I made it.

  The specific evaluation method in the present Example 1 is as follows.

  After execution of the coating process of the electrical insulating coating, a sample was taken from the obtained metal strips 1 and 101, and the amount of coating in the plate width direction of the sample was measured by fluorescent X-rays. This measurement was performed at intervals of 50 mm from a position of 25 mm inward from both ends of the metal strips 1 and 101 in the plate width direction.

  FIG. 11 is a diagram showing the measurement results of the coating amount of the metal strips 1 and 101 obtained by performing the coating treatment of the electrical insulating coating under the operation conditions of Example 1. What is processed by the conventional continuous processing apparatus 103 is Comparative Example 1, and what is processed by the continuous processing apparatus 3 according to the present invention is Invention Example 1.

  Thus, in Comparative Example 1, the distribution of the coating amount of the electrically insulating coating is not uniform in the plate width direction of the metal strip 101, and in particular, the coating amount on both sides of the metal strip 101 in the plate width direction. Is excessive, and it can be confirmed that there is a great difference with respect to the target adhesion amount. In Comparative Example 1, peeling of the coating was confirmed on both sides of the metal strip 101 in the plate width direction. This is considered to be due to the excessive coating amount on both sides of the metal strip 101 in the plate width direction.

  In contrast, in Invention Example 1, it can be confirmed that the distribution of the coating amount of the electrically insulating coating is extremely uniform in the plate width direction of the metal strip 1. Further, in Invention Example 1, no defects such as peeling of the coating on both ends of the metal strip 1 in the plate width direction were confirmed.

  Next, Example 2 will be described.

  In Example 2, the metal strip 1 is obtained by electrolysis of an electrolytic solution by actually using a continuous processing apparatus 3 according to the present invention as shown in FIG. 9 and a conventional continuous processing apparatus 103 as shown in FIG. After the tin plating treatment for coating the surface of 101 with a tin plating film is performed, the coating amount in the plate width direction of the tin plating film coated on the surface of the metal bands 1 and 101 is observed, and the effect of the present invention It was decided to confirm.

  Specific operating conditions in Example 2 are as follows.

As the metal strips 1 and 101, those having a material of ordinary steel, a plate thickness of 0.14 mm, and a plate width of 950 mm were used. As the electrolytic solution, an aqueous solution of tin phenolsulfonate (Sn ²⁺ concentration 26 g / l) was used, and the liquid temperature was set to 55 ° C. As the anode electrode 33, a material whose material is Ti was used. The target adhesion amount of the plating film coated on the surfaces of the metal bands 1 and 101 is 1.0 g / m ² ± 10%, the line speed for conveying the metal bands 1 and 101 is 10 mpm, and the applied voltage is a DC voltage of 25V. It was made to become.

  A specific evaluation method in the second embodiment is the same as that in the first embodiment.

  FIG. 12 is a diagram showing the measurement results of the coating amount of the metal bands 1 and 101 obtained by performing the coating treatment of the plating film under the operation conditions of Example 2. What is processed by the conventional continuous processing apparatus 103 is Comparative Example 2, and what is processed by the continuous processing apparatus 3 according to the present invention is Invention Example 2.

  Thus, in Comparative Example 2, the distribution of the coating amount of the plating film is non-uniform in the plate width direction of the metal band 101, and in particular, the coating amount on both sides of the metal band 101 in the plate width direction is excessive. Thus, it can be confirmed that there is a great difference with respect to the target adhesion amount.

  In contrast, in Invention Example 2, it can be confirmed that the distribution of the coating amount of the plating film is extremely uniform in the plate width direction of the metal strip 1. Further, in Invention Example 2, no defects such as peeling of the coating on both sides of the metal strip 1 in the plate width direction were confirmed.

1: Metal strip 1a: Surface 3 to be treated: Continuous surface treatment device 30: Electrode group 31: Cathode electrode 33: Anode electrode 35: Electrode plate 37: Header 39: Laminar nozzle 39a: Slit-shaped injection port 41: Power supply device 43: Switch 45: Resistor 47: Power supply wiring 51: Electrolyte supply main pipe 53: Electrolyte supply branch pipe 55: Branch pipe flow control valve 61: Electrolytic tank 63: Discharge pipe 64: Storage tank 65: Electrolyte supply pump 66: Electrolyte filter 67: Main pipe flow control valve 71: Shielding plate 81: Conductor roll P: Transport direction W: Electrolyte Wa: Pool Wb: Droplet Wr: Laminar flow

Claims (20)

In the continuous surface treatment method of a metal strip, in which an electrically insulating coating is coated on the surface of the continuously transported metal strip by electrolysis of an electrolytic solution,
An anode electrode is disposed opposite to the surface to be treated of the metal strip to be coated with the electrical insulating film,
Injecting the electrolytic solution that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip,
A continuous surface treatment of a metal band, wherein a voltage is applied between the metal band as a cathode and the anode electrode as an anode, and an electric current is passed through an electrolyte as a laminar flow ejected from the anode electrode. Method. In the step of disposing the anode electrode, further disposing a cathode electrode opposite to one side of the metal strip,
In the step of injecting the electrolytic solution, an electrolytic solution that becomes a laminar flow is sprayed from the cathode electrode to one opposite surface of the metal strip, and an electrolysis that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip. Spray liquid,
In the step of energizing, a voltage is applied between the cathode electrode as a cathode and the anode electrode as an anode, and energization is performed through the sprayed electrolyte solution as the laminar flow and the metal strip. The continuous surface treatment method for a metal strip according to claim 1. In the step of disposing the anode electrode, a conductor roll that can be energized in contact with the metal strip is further disposed,
In the step of energizing, a voltage is applied between the conductor roll as a cathode and the anode electrode as an anode, and the energization is conducted through the sprayed laminar flow electrolyte and the metal strip. The continuous surface treatment method for a metal strip according to claim 1. The electrolytic solution is either a metal ion and a fluorine ion having a molar ratio of 4 times or more with respect to the metal ion, or a complex ion containing a metal and the metal having a molar ratio of 4 times or more with respect to the metal. The method for continuous surface treatment of a metal strip according to any one of claims 1 to 3, wherein the aqueous solution has a pH of 2 to 7 and contains at least one kind. In the continuous electrolytic treatment method of the metal strip, in which the plating film is coated by electrolysis of the electrolytic solution on the surface of the continuously transported metal strip,
An anode electrode is disposed opposite to the surface to be treated of the metal strip to be coated with the plating film,
Injecting the electrolytic solution that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip,
A continuous surface treatment of a metal band, wherein a voltage is applied between the metal band as a cathode and the anode electrode as an anode, and an electric current is passed through an electrolyte as a laminar flow ejected from the anode electrode. Method. In the step of disposing the anode electrode, further disposing a cathode electrode opposite to one side of the metal strip,
In the step of injecting the electrolytic solution, an electrolytic solution that becomes a laminar flow is sprayed from the cathode electrode to one opposite surface of the metal strip, and an electrolysis that becomes a laminar flow from the anode electrode to the surface to be processed of the metal strip. Spray liquid,
In the step of energizing, a voltage is applied between the cathode electrode as a cathode and the anode electrode as an anode, and energization is performed through the sprayed electrolyte solution as the laminar flow and the metal strip. A continuous surface treatment method for a metal strip according to claim 5. In the step of disposing the anode electrode, a conductor roll that can be energized in contact with the metal strip is further disposed,
In the step of energizing, a voltage is applied between the conductor roll as a cathode and the anode electrode as an anode, and the energization is conducted through the sprayed laminar flow electrolyte and the metal strip. A continuous surface treatment method for a metal strip according to claim 5. The continuous surface of the metal strip according to claim 7, wherein in the step of disposing the anode electrode, a plurality of electrode groups each composed of a set of the anode electrode and the conductor roll are disposed in the transport direction of the metal strip. Processing method. The method for continuous surface treatment of a metal strip according to any one of claims 5 to 8, wherein the electrolytic solution is a plating solution containing metal ions. Both sides of the metal band to be conveyed are the surface to be processed,
10. The metal strip according to claim 1, wherein in the step of disposing the anode electrode, an anode electrode is disposed opposite to the surface to be processed on both sides of the metal strip. Continuous surface treatment method. In a continuous surface treatment apparatus for a metal strip for coating an electrically insulating coating by electrolysis of an electrolytic solution on the surface of a continuously transported metal strip,
An anode electrode disposed opposite to the treated surface of the metal strip to be coated with the electrically insulating coating;
A laminar nozzle that is provided on the anode electrode and injects an electrolyte solution that becomes a laminar flow from the anode electrode to the surface to be treated of the metal strip;
A voltage applying means for applying a voltage between the metal strip as a cathode and the anode electrode as an anode and energizing through an electrolyte as a laminar flow ejected from the laminar nozzle. Continuous surface treatment equipment for belts. Further comprising a cathode electrode disposed opposite to one side of the metal strip,
The cathode electrode is provided with a laminar nozzle that injects an electrolyte solution that becomes a laminar flow from one side of the cathode electrode to the opposite side of the metal strip.
The voltage application means applies the voltage between the cathode electrode as a cathode and the anode electrode as an anode, and the electrolyte solution as a laminar flow ejected from a laminar nozzle of the cathode electrode and the anode electrode, The continuous surface treatment apparatus for a metal strip according to claim 11, wherein electricity is passed through the metal strip. A conductor roll that can be energized in contact with the metal strip;
The voltage application means applies a voltage between the conductor roll as a cathode and the anode electrode as an anode, and energizes the electrolyte solution as a laminar flow ejected from the laminar nozzle and the metal strip. The continuous surface treatment apparatus for a metal strip according to claim 11. The electrolytic solution is either a metal ion and a fluorine ion having a molar ratio of 4 times or more with respect to the metal ion, or a complex ion containing a metal and the metal having a molar ratio of 4 times or more with respect to the metal. It is an aqueous solution of pH 2-7 containing 1 or more types, The continuous surface treatment apparatus of the metal strip in any one of Claims 11-13 characterized by the above-mentioned. In the continuous electrolytic treatment apparatus of the metal strip for coating the plating film by electrolysis of the electrolytic solution on the surface of the continuously transported metal strip,
An anode electrode disposed opposite to the surface of the metal strip to be coated with the plating film;
A laminar nozzle that is provided on the anode electrode and injects an electrolyte solution that becomes a laminar flow from the anode electrode to the surface to be treated of the metal strip;
A voltage applying means for applying a voltage between the metal strip as a cathode and the anode electrode as an anode and energizing through an electrolyte as a laminar flow ejected from the laminar nozzle. Continuous surface treatment equipment for belts. Further comprising a cathode electrode disposed opposite to one side of the metal strip,
The cathode electrode is provided with a laminar nozzle that injects an electrolyte solution that becomes a laminar flow from one side of the cathode electrode to the opposite side of the metal strip.
The voltage application means applies the voltage between the cathode electrode as a cathode and the anode electrode as an anode, and the electrolyte solution as a laminar flow ejected from a laminar nozzle of the cathode electrode and the anode electrode, The continuous surface treatment apparatus for a metal strip according to claim 15, wherein electricity is passed through the metal strip. A conductor roll that can be energized in contact with the metal strip;
The voltage application means applies a voltage between the conductor roll as a cathode and the anode electrode as an anode, and energizes the electrolyte solution as a laminar flow ejected from the laminar nozzle and the metal strip. The continuous surface treatment apparatus for a metal strip according to claim 15. The continuous surface treatment apparatus for a metal strip according to claim 17, wherein a plurality of electrode groups each including a set of the anode electrode and the conductor roll are arranged in a transport direction of the metal strip. The continuous surface treatment apparatus for a metal strip according to any one of claims 15 to 18, wherein the electrolytic solution is a plating solution containing metal ions. Both sides of the metal band to be conveyed are the surface to be processed,
The continuous surface treatment apparatus for a metal strip according to any one of claims 11 to 19, wherein the anode electrode is disposed opposite to the surface to be treated on both sides of the metal strip.

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