JP5012465B2 - Electroplating apparatus and electroplating method - Google Patents

Description

  In the present invention, a plurality of plating tanks are disposed, and the steel strip is wound around a conductor roll provided at an upper position of the plating tank and a sink roll provided by being immersed in the plating tank. The present invention relates to an electroplating apparatus in which a steel strip can move up and down into and out of a plating solution in the plating tank, and an anode electrode is provided at a predetermined interval on at least one surface of the steel strip located in the plating tank. In particular, the present invention relates to an electroplating apparatus and method for suppressing corrosion of the conductor roll at low cost and simply.

  As one of means for plating zinc, tin, chromium, etc. on a material to be treated such as a steel plate, for example, an electrode immersed in a plating tank is used as an anode, and a steel strip is used as a cathode. There is an electroplating method in which a voltage is applied to the steel strip to apply plating to the steel strip surface by so-called cathodic electrolysis. In the electroplating apparatus, energization of the steel strip is performed by bringing an energizing roll called a conductor roll into contact with the steel strip.

  In such an electroplating apparatus, corrosive gas (fluorine compound, chlorine compound, fumes, etc.) is generated from the plating solution in the plating tank during plating on the steel strip. Such corrosive gas tends to be dissipated above the plating tank. In this case, the conductor roll located above the plating tank tends to come into contact with the corrosive gas and corrode. Therefore, as a conductor roll, conventionally, a conductor roll formed by spraying Cu plating or a Ni-based alloy to improve the conductivity and corrosion resistance on the surface of the iron roll is used, or instead of the iron roll, A stainless steel roll having excellent corrosion resistance was used.

  However, even when a surface treatment such as plating or thermal spraying is performed for corrosion resistance, the corrosion of the conductor roll is greatly affected by the corrosive gas present in the atmosphere around the conductor roll, so that the corrosion is not enough. In addition, there is a problem in that using stainless steel or the like for the conductor roll causes an increase in cost.

Further, as means for suppressing the generation of the corrosive gas, as disclosed in, for example, Patent Document 1, a suction hood attached to an electrode provided in a plating tank or a suspension frame thereof, and an exhaust fan from the suction hood There is an anodizing apparatus equipped with an exhaust purifier having an exhaust duct for leading gas to the rear. However, the plating apparatus disclosed in Patent Document 1 is an anodizing apparatus that performs plating by suspending a steel plate, and does not disclose the point of preventing corrosive gas from a conductor roll located above the plating tank.
JP-A-53-50022

  An object of the present invention is to provide an electroplating apparatus that is located above a plating tank and that can suppress corrosion of a conductor roll, particularly an iron roll, that is exposed to the use environment of corrosive gas at a low cost, simply, and effectively. It is to provide such a method.

  In order to solve the above problems, the present inventors have repeatedly studied an electroplating apparatus and a method thereof. As a result, by providing a gas spraying means for spraying a protective gas for preventing the approach of the corrosive gas to the surface of the conductor roll, the corrosive gas filled around the surface of the conductor roll is blown off. As a result, it was found that corrosion of the conductor roll can be effectively suppressed.

The present invention has been made based on such findings, and the gist thereof is as follows.
(1) A plurality of plating tanks filled with a plating solution are arranged, and a steel strip is wound around a conductor roll provided at an upper position of the plating tank and a sink roll provided by being immersed in the plating tank. Thus, the steel strip can move up and down into and out of the plating solution in the plating tank, and at least one surface of the steel strip located in the plating tank is provided with an anode electrode at a predetermined interval. In the electroplating apparatus, the electroplating apparatus further comprises gas spraying means for spraying a protective gas for preventing the corrosive gas generated from the plating solution from approaching the surface of the conductor roll.

(2) The electricity according to (1), wherein the gas blowing means blows the protective gas onto a surface exposed portion other than a surface portion around which the steel strip is wound on the surface of the conductor roll. Plating equipment.

(3) The gas spraying means is a pipe with a spray nozzle provided facing the top and both sides of the conductor roll when viewed in the axial direction of the conductor roll. Or the electroplating apparatus as described in (2).

(4) The above (1), (2) or (4) further comprising a gas suction means for sucking the corrosive gas above the plating tank and below the conductor roll. 3) The electroplating apparatus as described.

(5) The electroplating apparatus according to (3) or (4) above, wherein the speed of the gas discharged from the pipe with the spray nozzle is 1 to 5 m / sec.

(6) The electroplating apparatus according to any one of (1) to (5), wherein the conductor roll is made of iron.

(7) Filling a plurality of plating tanks with plating solution and winding the steel strip around a conductor roll provided above the plating tank and a sink roll provided by being immersed in the plating tank. The steel strip enables up and down movement to and from the plating solution in the plating tank, and at least the steel strip is provided by an anode electrode provided at a predetermined interval with respect to the steel strip located in the plating tank. In the electroplating method for plating on one surface, an electric gas is characterized in that a protective gas for preventing the approach of corrosive gas generated from the plating solution is sprayed from the gas spraying means to the upper surface of the conductor roll. Plating method.

(8) The electricity according to (7), wherein the gas is blown by blowing the protective gas onto a surface exposed portion other than a surface portion around which the steel strip is wound on the surface of the conductor roll. Plating method.

(9) The electroplating method according to (7) or (8) above, wherein the gas spray is applied to an upper portion and both side portions of the conductor roll as viewed in an axial direction of the conductor roll.

(10) The electroplating method as described in (7), (8) or (9) above, wherein the corrosive gas is sucked above the plating tank and below the conductor roll.

(11) The electroplating method according to any one of (7) to (10) above, wherein the gas is sprayed at a speed of 1 to 5 m / sec.

  According to the present invention, an electroplating apparatus that is located above a plating tank and that can suppress corrosion of a conductor roll, particularly an iron roll, exposed to the use environment of corrosive gas at a low cost, in a simple and effective manner, and It became possible to provide the method.

Hereinafter, the configuration of the present invention and the reasons for limitation will be described with reference to the drawings.
FIG. 1 conceptually shows a part of an essential part of an electroplating apparatus according to the present invention.

As shown in FIG. 1, the electroplating apparatus according to the present invention is provided with a plurality of plating tanks 10 (10 a, 10 b,...) Filled with a plating solution 11, and a steel strip 20 is disposed above the plating tank 10. The steel strip 20 moves up and down into and out of the plating solution 11 in the plating tank 10 by being wound around a conductor roll 30 provided at a position and a sink roll 40 provided by being immersed in the plating tank 10. This is an electroplating apparatus 1 in which anode electrodes 50 are provided at a predetermined interval on at least one surface of the steel strip 20 located in the plating tank 10.
Below, the detail of the electroplating apparatus 1 of this invention is described.

  As shown in FIG. 1, the plating tank 10 of the present invention is a tank for storing a plating solution 11, and a commonly used plating tank may be used, and the capacity and number thereof are not particularly limited. Moreover, the plating solution 11 in the said plating tank 1 can select arbitrary plating solutions 11 with the kind of plating.

  As shown in FIG. 1, the steel strip 20 of the present invention is immersed in the plating solution 11 while being wound by a plurality of conductor rolls 30 and sink rolls 40, and from the plating solution 11. It is possible to move in and out of the plating solution 11 while repeating the ascending and winding up. About the structure of the said steel strip 20, what is necessary is just to select an arbitrary thing according to a use, for example, iron, stainless steel, etc. are used as the steel strip 20. FIG.

  As shown in FIG. 1, the conductor roll 30 and the sink roll 40 of the present invention convey the steel strip 20 by winding the steel strip 20 between them and rotating them in conjunction with each other. is there. The sink roll 40 is a roll made of rubber or the like, and examples of the conductor roll 30 include an iron roll, a stainless steel roll, and the like. In particular, as a material capable of remarkably obtaining the effects of the present invention. It is preferably a roll using an iron roll which is inexpensive but easily corroded. Further, when importance is attached to corrosion resistance, the conductor roll 30 is preferably plated with at least one of Cu, Ni, Co, and Cr.

  The counter electrode 50 of the present invention is not particularly limited as long as it functions as an anode when performing cathodic electrolysis.

  In addition, as shown in FIG. 1, the electroplating apparatus 1 of this invention is the gas spraying means 60 which sprays the protective gas which prevents the approach of the corrosive gas which generate | occur | produces from the plating solution 11 with respect to the surface of the said conductor roll 30. As shown in FIG. Is further provided.

  The gas spraying means 60 of the present invention can remove the corrosive gas filled around the surface of the conductor roll 30 from the periphery of the surface of the conductor roll 30 by the pressure of the sprayed protective gas. Therefore, this is an effective means in that corrosion of the conductor roll can be effectively suppressed.

  Here, FIG. 2 schematically shows the gas spraying means 60 and the conductor roll 30 as viewed obliquely from above, but the gas spraying means 60 is the steel strip 20 on the surface of the conductor roll 30. It is preferable to spray the protective gas on the surface exposed portions 30a and 30b other than the surface portion on which is wound. The electroplating apparatus 1 according to the present invention aims to suppress corrosion of the steel strip 20 by corrosive gas, and the surface of the conductor roll 30 other than the surface exposed portions 30a and 30b is covered with the steel strip 20. Therefore, even if the protective gas is sprayed, the effect is thin.

  Further, the gas spraying means 60 is not particularly limited as long as it is a means capable of spraying a protective gas to the surface of the conductor roll 30 and preventing the approach of corrosive gas, but as shown in FIG. It is preferable that the pipe 61 is provided with a spray nozzle provided so as to face the upper and both sides of the conductor roll 30 when viewed in the axial direction of the conductor roll 30. This is because the nozzle-equipped pipe 61 can surround the upper part and both side parts of the conductor roll 30 relatively easily, and enables effective spraying of the protective gas.

  Here, FIG. 3 is an enlarged view of a part of the pipe 61 with blowing nozzle and the conductor roll 30 in FIG. 2 as viewed from the axial direction of the conductor roll 30. As shown in FIG. 3, it has a plurality of spray nozzles 61 a provided facing the conductor roll 30. Moreover, the cross-sectional shape of the piping 61 with the spray nozzle is not particularly limited as long as the protective gas can be passed efficiently, and even if it is cylindrical as shown in FIG. It doesn't matter. Further, although the distance between the pipe 61 with the spray nozzle and the surface of the conductor roll 30 varies depending on the strength of the gas to be discharged, etc., it is effective that the distance X is 40-60 mm at the closest distance Is preferable in that it can be injected.

  The type of protective gas discharged from the spray nozzle 61a may be any gas that does not react with the corrosive gas and corrodes the conductor roll. For example, air, nitrogen, or argon is used. it can. Moreover, it is preferable that the speed | velocity | rate of the gas discharged | emitted from the said piping 61 with a spray nozzle is 1-5 m / sec. When the speed is less than 1 m / sec, the gas pressure becomes too small, so the corrosive gas cannot be sufficiently eliminated. On the other hand, when the speed exceeds 5 m / sec, the gas pressure is too large. This is because the plating applied on the steel strip 20 may be adversely affected.

  Furthermore, it is preferable to further comprise a gas suction means (not shown) for sucking the corrosive gas above the plating tank 10 and below the conductor roll 30. Since the corrosive gas reaching the conductor roll 30 can be suppressed by the gas suction means, in addition to the effect of the gas blowing means 60, the effect of further suppressing the corrosion of the conductor roll 30 is enhanced. is there.

Next, the electroplating method according to the present invention will be described.
As shown in FIG. 1, the electroplating method according to the present invention fills a plurality of plating tanks 10 with a plating solution 11, and a conductor roll 30 provided with a steel strip 20 at an upper position of the plating tank 10, The steel strip 20 can be moved in and out of the plating solution 11 in the plating tank 10 by being wound around a sink roll 40 immersed in the plating tank 10, and an anode provided at a predetermined interval. The electrode 50 is used to plate at least one surface of the steel strip. When performing this plating, a protective gas that prevents the corrosive gas generated from the plating solution from approaching the surface of the upper portion of the conductor roll is sprayed from the gas spraying means.

  The above description is merely an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.

Examples of the present invention will be described.
Example 1
As shown in FIG. 1, Example 1 includes a plating tank 10 filled with a plating solution 11, and an iron roll provided with chrome plating at a position above the plating tank as a conductor roll. A sink roll 40 soaked in the pipe, and an anode electrode at a position facing both surfaces of the steel strip 20, and a pipe 61 with a spray nozzle at positions facing the top and both sides of the conductor roll. The provided electroplating apparatus 1 was used as a sample. In addition, the speed of the gas blown out from the pipe 61 with the blowing nozzle is 3 m / second, and the blowing of the gas is performed on the exposed surface 30a other than the surface of the conductor roll 30 on which the steel strip 20 is wound. Was made against.

(Comparative Example 1)
In Comparative Example 1, an electroplating apparatus having the same conditions as in Example 1 was used as a sample, except that the pipe 61 with a spray nozzle as the gas spraying means 60 was not provided.

(Evaluation method)
About each electroplating apparatus produced above, when the electroplating apparatus was used for one year, the average number of replacement times (times) of the conductor roll 30 due to corrosion by corrosive gas was measured. The results are shown in Table 1.

  According to Table 1, the electroplating apparatus of Example 1 having gas spraying means has a lower corrosive gas concentration in the vicinity of the conductor roll due to gas spraying compared to Comparative Example 1, resulting in roll removal. It turns out that the number of replacements is only a quarter.

  According to the present invention, an electroplating apparatus that is located above a plating tank and that can suppress corrosion of a conductor roll, particularly an iron roll, exposed to the use environment of corrosive gas at a low cost, in a simple and effective manner, and It is possible to provide such a method.

It is sectional drawing which looked at some electroplating apparatuses by this invention from the axial direction of the conductor roll. It is the schematic diagram which showed the state which looked at the gas spraying means and conductor roll of this invention from diagonally upward. FIG. 3 is a schematic view in which a part of a pipe with a spray nozzle and a conductor roll in FIG. 2 is enlarged and viewed from the axial direction of the conductor roll 30.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electroplating apparatus 10 Plating tank 11 Plating solution 20 Steel strip 30 Conductor roll 40 Sink roll 50 Counter electrode 60 Gas spraying means 61 Pipe with spray nozzle

Claims (11)

A plurality of plating tanks filled with a plating solution are arranged, and the steel strip is wound around a conductor roll provided at an upper position of the plating tank and a sink roll provided by being immersed in the plating tank. An electroplating apparatus in which the steel strip is allowed to move up and down into and out of the plating solution in the plating tank, and an anode electrode is provided at a predetermined interval on at least one surface of the steel strip located in the plating tank In
An electroplating apparatus comprising gas spraying means for spraying a protective gas for preventing the corrosive gas generated from the plating solution from approaching the surface of the conductor roll.   2. The electroplating apparatus according to claim 1, wherein the gas spraying unit sprays the protective gas to a surface exposed portion other than a surface portion around which the steel strip is wound on the surface of the conductor roll.   The said gas spraying means is piping with the spray nozzle provided facing the upper part and both sides of the said conductor roll seeing in the axial direction of the said conductor roll. Electroplating equipment.   4. The electroplating apparatus according to claim 1, further comprising a gas suction means for sucking the corrosive gas above the plating tank and below the conductor roll.   The electroplating apparatus according to claim 3 or 4, wherein a speed of gas discharged from the pipe with the spray nozzle is 1 to 5 m / sec.   The electroplating apparatus according to claim 1, wherein a material of the conductor roll is iron. Filling the plating solution into a plurality of plating tanks, and winding the steel strip on a conductor roll provided at an upper position of the plating tank and a sink roll provided by being immersed in the plating tank, The steel strip is capable of moving up and down into and out of the plating solution in the plating tank, and with respect to at least one surface of the steel strip by an anode electrode provided at a predetermined interval with respect to the steel strip located in the plating tank In the electroplating method of plating,
An electroplating method comprising spraying a protective gas for preventing a corrosive gas generated from a plating solution from approaching the surface of the upper portion of the conductor roll from a gas spraying means.   The electroplating method according to claim 7, wherein the gas is sprayed by spraying the protective gas onto a surface exposed portion other than a surface portion around which the steel strip is wound on the surface of the conductor roll.   The electroplating method according to claim 7 or 8, wherein the gas spray is applied to an upper portion and both side portions of the conductor roll as viewed in an axial direction of the conductor roll.   The electroplating method according to claim 7, 8 or 9, wherein the corrosive gas is sucked above the plating tank and below the conductor roll.   The electroplating method according to any one of claims 7 to 10, wherein the gas is sprayed at a speed of 1 to 5 m / sec.

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