JPH0683767U - Electrolysis device for metal strips - Google Patents

Abstract

(57) [Abstract] [Purpose] In an electrolytic treatment apparatus, a proposal of an electrolytic treatment apparatus that prevents unevenness in dryness of a metal strip after passing through a seal / roll and enables a keep wet that does not contaminate a solution in an electrolytic treatment tank. [Structure] Water is jetted to the metal strip immediately after passing through the seal roll, and the jet water receiving pan is installed below the metal strip.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrolytic treatment device for metal strips.

[0002]

[Prior art]

 Generally, in equipment for continuously electrolytically treating metal strips, the metal strips after passing through the seal roll are kept wet by spraying an electrolyte solution, water or an aqueous solution containing components of the electrolyte solution, Prevents uneven dryness. At this time, as a spraying method, water is sprayed onto the surface of the metal strip and the current-carrying roll after passing through the seal / roll, as in the method of preventing electrodeposition for vertical plating equipment disclosed in JP-A-63-250492. The method is known.

[0003]

[Problems to be solved by the device]

 However, in the method as disclosed in JP-A-63-250492, when water or an aqueous solution containing an electrolyte solution component is sprayed on the surface of the metal strip and the current-carrying roll after passing through the seal / roll, the sprayed water or electrolyte solution Since the aqueous solution containing the components is mixed with the electrolytic solution in the electrolytic treatment tank to dilute the electrolytic solution, there was a problem that an electrolytic solution concentrating device had to be installed.

Further, when the electrolyte solution is sprayed on the surface of the metal strip and the energizing roll after passing through the seal / roll, the surface layer of the metal strip is dissolved by the electrolyte solution, and the quality of the metal strip (appearance, corrosion resistance, sliding) However, there was a problem that the quality deteriorated. It is an object of the present invention to provide a metal strip processing apparatus which solves the above problems.

[0005]

[Means for Solving the Problems]

 The present invention is an electrolytic treatment tank in a facility for continuously electrolytically treating a metal strip by injecting water into the metal strip immediately after passing through a seal / roll and installing the jet water receiving pan below the metal strip. This is an electrolytic treatment apparatus for metal strips, characterized in that the injection of water into the internal electrolyte solution is eliminated.

[0006]

[Action]

 In the case of the present invention, since water can be used as the jet liquid to the metal strip immediately after passing through the seal / roll, the surface layer of the metal strip is dissolved by the jet liquid and the quality of the metal strip (appearance, corrosion resistance, sliding property) The problem of deterioration of sex) was completely eliminated. Further, since the pan for receiving the jet water is installed below the metal strip, there is no problem that the jet water mixes with the electrolyte solution in the electrolytic treatment tank and the electrolyte solution is diluted.

As for the properties of the jet water, general industrial pure water is assumed, and the pH is preferably 2 to 12, though not particularly limited thereto. If it is out of this range, the surface layer of the metal strip may be dissolved to deteriorate the quality of the metal strip, particularly the appearance, or the electrolytic solution component may be deposited on the steel sheet. The concentration of the electrolyte in the jet water is not particularly limited, but it should be noted that the electrolyte may deteriorate the quality of the metal strip or form a precipitate on the steel sheet. is there. There is no problem at the level of general industrial pure water.

As a method of injecting water, a spray method is easy in terms of facility construction cost and maintainability, but is not limited to a spray method, and a laminar flow method, a laminar jet method, etc. Any method can be used as long as it can supply water continuously. The present invention is equally applicable to electrolysis of not only steel plates but also metal plates such as copper plates, aluminum plates and brass plates. In the following description, the most versatile steel plate will be described.

FIG. 1 is a side sectional view showing an example of a surface treatment equipment for a steel sheet to which the present invention is applied, and FIG. 2 is a plan view of FIG. The steel plate 2 is passed in the direction of the arrow 1, passes between the energizing roll 3 and the backup roll 4 on the inlet side of the processing tank 5, and is loaded into the processing tank 5. The steel sheet 2 may be any hot rolled steel sheet, cold rolled steel sheet, surface-treated steel sheet (electrogalvanized steel sheet, hot dip galvanized steel sheet, etc.), and is not particularly limited.

Electrodes 8 and 10 are provided in the processing tank 5, and a pair of seal rollers 6 and 7 and seal rolls 11 and 12 are arranged in front of and behind the electrodes 8 and 10. The steel plate 2 that has left the processing tank 5 is kept wet by the jet water 17, passes between the power supply roll 15 on the outlet side and the backup roll 16, and is conveyed to the next step. The arrangement and number of the above-mentioned various rolls and electrodes are not limited to this. The electrolyte solution 9 in the treatment tank 5 may be any liquid as long as it meets the purpose, and is not particularly limited.

From the viewpoint of keep-wetting, the spray position of the sprayed water 17 sprayed on the steel plate is preferably provided immediately after the seal rolls 11 and 12 in the sheet passing direction, and the sprayed water 17 spraying direction. From the viewpoint of keep-wet, it is better to aim the seal rolls 11 and 12 as much as possible, but the present invention is not limited to this. Empirically, if the jet water reaches the steel plate 2 within 0.3 seconds after the steel plate 2 exits the seal rolls 11 and 12, the keep wet is sufficient and the uneven dryness does not occur.

Since the purpose of installing the jet water receiving pan 14 is to receive the jet water that has not been on the steel plate 2, it is installed near the seal roll 12 and on the steel plate 2. Due to the need to flush the jet water that has not been on board, it is installed slightly lower than the progress of the steel plate 2 as shown in FIG. It is preferable that this angle is lowered by 5 ° or more with respect to the progress of the steel plate 2.

FIG. 3 is a perspective view of an example of the jet water receiving pan. The jet water receiving pan is composed of a side surface 18 and a bottom surface 19. The height of the side surface 18 should be designed according to the material of the jet water receiving pan, the pressure of the jet water, the flow velocity, the flow rate, the injection method, etc. Generally, 50 mm is sufficient. The width of the bottom surface 19 should be designed according to the spray angle of the sprayed water, the spread angle, the width of the steel plate 2, etc., but it goes without saying that it must be at least larger than the width of the steel plate 2. Moreover, the length of the bottom surface 19 is arbitrary.

Although the material and processing method of the side surface 18 and the bottom surface 19 are arbitrary, since the jet water receiving pan 14 is located in the vicinity of the processing tank 5 and is often installed in a corrosive atmosphere, the FRP, It is desirable that the corrosion resistance such as tongue is excellent. Further, 20 is a gutter for collecting the cleaning liquid discharged from the pan 14. By the way, using the equipment shown in Fig. 1, between the seal roll 11 and the outlet-side energizing roll 15 on the surface of the steel plate 2 (plate width 1200 mm, passing speed 50 mpm), and at the point 0.2 m from the seal roll 11, purified water While spraying (pH 6.9) at 3.5 m ³ / hour, Zn-Ni plated steel sheet was subjected to the following alternating electrolysis in a bath consisting of Na ₂ SO ₄ : 150 g / l, NaNO ₃ : 20 g / l and pH 1.5. , A black steel plate was manufactured.

Anode current density 60 A / dm ² Cathode current density 24 A / dm ² Cathode current density / Anode current density 0.4 Cathodic treatment density / Anodic treatment time 0.2 Alternating cycle 5 Hz Treatment time 5 sec As a result, there is no unevenness of color tone and it is uniform. A steel plate having an appearance was obtained. Further, at this time, the electrolyte solution 9 was not increased by mixing the purified water spray into the treatment tank 5.

For comparison, the same treatment as in the above example was carried out except that the jet water receiving pan 14 was removed, and a steel sheet with a uniform appearance and no color tone unevenness was obtained, but 1 m ³ / hour. The electrolyte solution 9 increased in proportion, and long-term operation became impossible. Further, when the spray of the electrolyte solution 9 was used instead of the purified water spray, uneven color tone was caused by decolorization on the entire surface.

[0017]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, water or an aqueous solution containing an electrolyte solution component is electrolyzed in the electrolytic treatment tank on the surfaces of the metal band and the current-carrying roll after passing through the seal / roll. It is possible to use without diluting the electrolyte solution by contaminating the solution, and since it is not necessary to spray the electrolyte solution on the surface of the metal body and the current-carrying roll after passing the seal / roll, the electrolyte solution may cause the metal band surface layer to It does not melt and the quality of the metal strip (appearance, corrosion resistance, slidability) does not deteriorate. Therefore, by using the devised device, it is possible to easily and completely omit the installation of the electrolyte solution concentrating device and prevent deterioration of the quality of the metal strip, and it is possible to stably produce a surface-treated metal strip with good surface properties. It was

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of a steel sheet surface treatment facility to which the present invention is applied.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view showing an example of a jet water receiving pan.

[Explanation of symbols]

 1 Steel plate traveling direction 2 Steel plate 3 Current-carrying roll 4 Backup roll 5 Treatment tank 6 Seal roll 7 Seal roll 8 Electrode 9 Electrolyte solution 10 Electrode 11 Seal roll 12 Seal roll 13 Jet water supply header 14 Jet water receiving pan 15 Energizing roll 16 Backup roll 17 Water jet 18 Side of water jet pan 19 Bottom of water jet pan 20 Gutter

Claims (1)

[Scope of utility model registration request] 1. In a facility for continuously electrolytically treating a metal strip, water is jetted to the metal strip immediately after passing through a seal / roll,
Further, by disposing the pan for receiving the jet water below the metal strip, mixing of the jet water into the electrolytic solution in the electrolytic treatment tank is eliminated, and an electrolytic treatment apparatus for a metal strip.