JPS60174900A - Electrolytic treating device for steel hoop - Google Patents

Abstract

PURPOSE:To perform an electrolytic treatment uniform in the transverse direction of a steel hoop in the stage of treating electrolytically said hoop in an electrolytic cell by providing auxiliary electrodes in the edge parts in addition to ordinary electrodes for electrolysis. CONSTITUTION:Electrodes 14a, 14b having different polarities are disposed to face the front and rear surfaces of a steel hoop 11 in the stage of subjecting said hoop 11 to electrolytic pickling or electrolytic degreasing in an electrolyte while traveling said hoop by rollers 12 in an electrolytic cell 10. An electrolytic treating liquid for pickling or degreasing is sprayed to the surface of the hoop by a pump 17 from a header 15. The density of the current flowing in the edge parts of the hoop 11 is small and the current does not flow at the uniform current flow in the transverse direction of the hoop 1 thus resulting in generation of uneven pickling and degreasing treatments in the edge parts. Auxiliary electrodes 18a, 18b are therefore provided in the edge parts in addition to the ordinary electrodes 14a, 14b and the insufficient and nonuniform pickling or degreasing is corrected by the current from such electrodes so that the entire front and rear surfaces of the hoop 11 are uniformly pickled or degreased.

Description

[Detailed description of the invention] The present invention relates to an apparatus for electrolytic treatment of steel strip.

When performing electrolytic pickling and electrolytic degreasing of a steel strip, a current 4 is applied as shown in FIG. However, at the edge of the steel strip I, it flows through a path in the ameliorating fluid that has a lower electrical resistance than the path through the steel strip I.

As a result, electrolytic pickling and electrolytic degreasing were not performed on the edge portions of the steel strip L, and unevenness occurred in the width direction during electrolytic pickling and electrolytic degreasing, resulting in the problem of not being able to obtain products of good quality. . In addition, 5 in Figure 1 is a header. The present invention was made in view of this point, and it forms a uniform current density distribution in the width direction of the steel strip over the entire length of the line, and has an extremely good The present invention provides an apparatus for electrolytic treatment of steel strips that can perform electrolytic pickling and electrolytic degreasing while maintaining quality.

That is, the present invention provides electrodes with different polarities opposite the front and back surfaces of a steel strip that is immersed in an electrolytic solution of an electrolytic cell and runs, and electrodes with different polarities on both sides of the edge portion of the steel strip. This is an electrolytic treatment device for steel strips, in which auxiliary electrodes of different polarities are provided in close proximity to each other.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing a schematic configuration of an embodiment of the present invention. 1o in the figure is an electrolytic cell.

At both ends of the electrolytic cell 10, rollers 12 for running the steel strip 11 are rotatably provided. Electrolyte 13
On the inlet side of the steel strip 110 in the electrolytic cell Zo filled with
are set up opposite each other. The header 1 is attached to the electrodes 14a and 14b.
5 is installed. Header 15 is connected to pump 17 via piping 16. On the exit side of the electrolytic cell 1O, auxiliary electrodes 18a and 18 are placed so as to face the edge portions on both sides of the steel strip J'70 that has passed through the electrodes 14a and 14b.
b is provided. The auxiliary electrode 18a is shown in FIG. 3 (5).
As shown in Figure CB), it is installed on the same plane as the steel strip 11, or as shown in Figure CB), the pole plate 18al perpendicular to the plane of the steel strip 1'1 is provided at the end of the pole. 18a'
It's good as well. In short, the current 19 at the edge of the steel strip 11
Any material that can increase the density of the material may be used.

According to the steel strip electrolytic treatment apparatus 20 configured in this way, the flow of the current 19 when passing between the electrodes 14a and zdb is as shown in FIG.
(b) The current density with respect to the position in the width direction of the IJ tube is as shown by the characteristic wire in Figure (B). In other words, the steel strip I
The current density decreases as it reaches the edge portion of I.

On the other hand, the flow of the current 19 to the steel strip 11 passing between the auxiliary electrodes 18a and 18b is as shown in FIG. 5 (5).
The current density with respect to the position of the steel strip 11 in the strip width direction at that time is as shown by the K characteristic line (CB) in the same figure. In other words, the current density increases as it reaches the edge portion of the steel strip 11.

As a result, the steel strip 11 that has passed through the auxiliary electrodes 18a and 18bf
The distribution of current density in the width direction becomes uniform as shown by the characteristic line (■) in FIG.

In other words, the integrated value of the current density of the steel strip 11 that has passed through the electrolytic bath 10 is constant in the width direction of the steel strip 11, so if electrolytic pickling and electrolytic degreasing are performed in the width direction of the steel strip 11, it will not be uneven. quality improvement.

As explained above, the electrolytic treatment apparatus for steel strip according to the present invention forms a uniform current density distribution in the width direction of the steel strip,
It is possible to perform electrolytic pickling and electrolytic degreasing with extremely good quality.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a conventional electrolytic processing apparatus for steel strip, FIG. 2 is a sectional view showing a schematic configuration of an embodiment of the present invention, and FIGS. 3 (5) and (B). FIG. 4 (5) and FIG. 5 (5) are explanatory diagrams showing an example of an auxiliary electrode, and FIG. 41) and 5 CB) are characteristic diagrams showing the relationship between current density and the position of the steel strip in the strip width direction, and FIG.
FIG. 3 is a characteristic diagram showing the relationship between the current density finally generated on the surface of the steel strip and the position of the steel strip in the strip width direction. lO... Electrolytic cell, 11... Steel strip, 12... Roller, Z3... Electrolyte, 14a, 14b... Electrode, 15
...Header, 76...Piping, 17...Pump 5t8
a. 18b... Auxiliary 'electrode, 18al... Plate, 19.
...Current%20...Strip electrolytic treatment equipment. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 1ejal l'd 11 Figure 4 (A) 4b (B)

Claims (1)

[Claims] Electrodes with different polarities are provided opposite to the front and back surfaces of the steel strip that is immersed in the electrolytic solution of the electrolytic bath and runs, and adjacent to both sides of the edge portion of the steel strip after passing through the electrodes. An apparatus for electrolytic treatment of steel strip, characterized in that auxiliary electrodes with different polarities are provided oppositely.