JPH0730480B2 - Continuous electroplating equipment for steel strip - Google Patents

Description

The present invention relates to a continuous electrolytic plating apparatus for steel strip.

[Prior Art] Fig. 3 shows an example of conventional plating equipment such as Zn and Sn.

In FIG. 3, the steel strip 2 unwound from the pay-off reel 1 is welded and connected to the end of the preceding steel strip by the welding machine 3, and then passed through the looper 4 in the pretreatment device 5 before degreasing, preheating, and other plating. Is subjected to the necessary processing. After that 10
After the surface is plated inside, the surface is subjected to cleaning, drying, etc. in the post-processing device 6, passed through the looper 7 and the sitter 8, and wound on the tension reel 9.

The plating bath liquid 11 is filled in the plating bath 10, and the steel strip 2 is wound around the conductor rolls 12a, 12b, 12c-- and the deflector rolls 13a, 13b, 13c ---- in alternation. To drive. Electrode 14 in plating bath solution 11
a, 14b, 14c, 14d are installed facing the surface of the steel strip 2, and the surface of the steel strip 2 is plated while the steel strip 2 passes between the electrodes as described later.

FIG. 4 is a detailed description of the structure of the electrodes of this conventional plating equipment. The electrodes 14a and 14b are connected to the anode side of a DC power supply 18a, and the conductor roll 12a is connected to the DC power supply 18a.
Is connected to the cathode side of. Assuming that the plating solution sandwiched between the electrodes 14a, 14b and the steel strip 2 is 19a, 19b, respectively, the DC power supply 18a-electrodes 14a, 14b-plating solution 19a, 19b-steel strip 2
~ Conductor roll 12a ~ An electric circuit consisting of a DC power supply 18a is formed, and the electrodes 14a, 14b serve as anodes and the steel strip 2 serves as a cathode. The surface of the belt 2 is scratched.

An example of the conventional structure of the soluble electrode will be described with reference to FIGS. 5 and 6. As the anode of the electrolytic plating equipment, by energizing the electric circuit for the plating, the anode electrodes 14a, 14b are electrolyzed and dissolved in the plating bath liquids 19a, 19b ("soluble anode") and not electrolyzed ( It is known that there is an "insoluble anode"), but in the case of a "soluble anode", the anode electrodes 14a and 14b are consumed depending on the amount of electricity that has been energized due to plating.
Therefore, the anode electrodes 14a and 14b need to be removed and replaced with new ones when they are consumed.

FIG. 5 is an enlarged view of a soluble anode portion in the conventional method,
FIG. 6 shows the arrow B, but the anode electrode 14a
Is divided into strip-shaped anode blocks 14a ₁ , 14a ₂ , 14a ₃ ---, and is placed on the current-carrying bar 15 fixed to the anode bridge 16, and the anode guide 17a,
It is attached so as to be narrowed between 17b, and can be moved in the direction of the arrow in FIG. 6 by using a jig or the like. Anode block 14a _1, 14b _2, --- is by connexion consumed energized, remove a new anode block 14a ₁ is mounted from the most expendable intensive 14a ₁ in order. The anode block 14a _1, 14a _2, --- removal attachment of 14a ₁ are conducted Te cowpea input from the top of plated tank 10 using a jig or the like.

[Problems to be solved by the invention]

In the case of special plating conditions such as continuous electrolytic plating device using molten salt (high temperature, blocking from the atmosphere, etc.), it is necessary to replace the soluble anode by the means shown in FIGS. 5 and 6. However, there is a problem in that the structure is complicated in terms of safety, prevention of contamination of impurities in the plating bath liquid, prevention of pollution, etc., and replacement work by input is very dangerous in case of emergency.

Further, the capacity of the plating tank for accommodating a large number of anode electrodes and a large number of deflector rolls for changing the traveling direction of the steel strip is extremely large, and the plating bath solution to be contained therein is inevitably large in capacity. For this reason, there is a serious drawback that not only a large amount of liquid is needed without being directly involved in the plating operation but a large amount of liquid is required, and in the case where the plating solution is a molten salt, it is extremely difficult to control its temperature and properties.

An object of the present invention is to provide a continuous electrolytic plating device which solves such problems.

[Means for Solving the Problems] The present invention relates to a continuous electrolytic plating apparatus in which soluble anodes are arranged facing each other on both sides of a steel strip running vertically to perform plating treatment on the surface of the strip, and the soluble anode is strip-shaped. A bottom seal in which an anode conductor roll is vertically arranged and has a slit through which the steel strip is passed in order to use the electrode and to run the strip electrode left and right through a feed roll while maintaining a constant gap. By using a member, by bringing the lower end of the strip electrode close to the upper surface of the bottom seal member, a plating bath is formed by the strip electrode, the feed roll and the bottom seal member. is there.

[Action]

In the present invention, a soluble strip-shaped anode is adopted, which is arranged around the outer circumference of the steel strip of the material to be plated so as to draw a locus surrounding the strip, and the strip-shaped anode itself forms the wall surface of the plating tank. The steel strip and the strip-shaped anode are filled with a plating bath solution, and the steel strip is continuously passed through the bath solution to perform a desired plating treatment on the surface. Since it is sequentially moved to be replaced with a new one, a relatively small volume of the plating bath liquid is stored only between the strip-shaped anodes facing the steel strip, and when the bath liquid is molten salt, The management becomes extremely easy, and the soluble band-shaped anode can be continuously and sequentially supplied from the outside of the sealed plating device in an airtight manner according to the consumption, and all the above-mentioned drawbacks of the conventional device are solved. It will be.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, 2 is a steel strip, 12a, 12b --- conductor rolls, 13a, 13b, --- deflector rolls, 10 is a plating tank, the wall surface of which is a soluble strip that moves orthogonally to the steel strip 2. The band-shaped anode 21 (in this embodiment, an aluminum band plate is used).

This strip-shaped anode 21 is supported by a back-up roll 22 so as to form a constant loop by surrounding the outer periphery of the steel strip 2 at appropriate intervals as shown in FIG. 2 described later, and on the side of the plating tank 10. The end seal is the feed roll 23 of the strip anode 21.
The molten salt 11 is contained as a plating bath liquid in the plating tank 10 formed by the band-shaped anode 21 and the feed roll 23.

Reference numeral 24 in FIG. 1 denotes a bottom seal of the plating tank 10.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 and shows an example of a continuous supply means for the strip-shaped anode 21.

In FIG. 2, the strip-shaped anode 21 is brought into the form of a coil, and after being rewound by a rewinding reel 25, it is fed by a feed roll 23.
Is sent to the electrode part by, and is consumed while passing through the electrode part,
The winding reel 26 sequentially winds the winding reel 26. Reference numeral 27 is an anode conductor roll for energizing the strip anode 21.

In this embodiment, an aluminum material is used as the soluble band-shaped anode, but it does not prevent the use of other metal materials. Further, when the molten salt is adopted as the plating bath liquid, equipment for heating and maintaining the temperature of the plating tank is required, but in this embodiment diagram, these equipment and the pre- and post-treatment device for steel strip are the same as those in the prior art. The illustration is omitted.

〔The invention's effect〕

According to the present invention, even when special plating conditions (high temperature, generation of toxic gas, deterioration of the plating bath solution due to moisture in the atmosphere, etc.) are required, the composition is safe and stable and is soluble without impairing the plating conditions. Anode can be continuously supplied, so that the surface of the steel strip can be stably and continuously plated, and the plating bath solution can be effectively used with the minimum necessary volume. It has an excellent effect that management of can be made extremely easy.

[Brief description of drawings]

FIG. 1 is a detailed configuration diagram showing an embodiment of an electrode portion of the present invention,
2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a configuration diagram of the entire conventional continuous electrolytic plating equipment, and FIG. 4 is a detailed configuration diagram of the electrode section of FIG. 3, FIG. FIG. 6 is a view taken in the direction of the arrow in FIG.
The figure is an illustration of a conventional soluble anode 2 …… Steel strip, 10 …… Mesh bath, 11 …… Mesh bath liquid, 12a,
12b, 12c ...... Conductor roll, 13a, 13b ...... Deflector roll, 21 ...... Soluble strip anode, 22 ...... Back up roll, 23 ...... Feed roll, 24 ...... Bottom seal of plating tank, 25 ...... Winding Return reel, 26 …… Take-up reel, 27 ……
Anode conductor roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Gen Shimazaki, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Toshio Taguchi 4-chome, Kannon Shinmachi, Nishi-ku, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Institute, Mitsubishi Heavy Industries Ltd. (72) Inventor Toshio Nakamori 1-3-3 Nishi-Nagasumotodori, Amagasaki City, Hyogo Prefecture Sumitomo Metal Industries, Ltd. Research Institute (72) Atsushi Shibuya Amagasaki, Hyogo Prefecture 1-3, Nishi-Nagasuhondori, Ichi, Sumitomo Metal Industry Co., Ltd. (56) Reference JP-A-59-140395 (JP, A)

Claims (1)

[Claims] 1. In a continuous electrolytic plating apparatus in which soluble anodes are arranged facing each other on both sides of a vertically running steel strip to perform plating treatment on the surface of the strip, a strip electrode is used as the soluble anode, and the strip electrode is used. The bottom end of the strip electrode is arranged by vertically arranging the anode conductor roll and using a bottom seal member having a slit through which the steel strip is passed in order to travel to the left and right while maintaining a constant distance via the feed roll. A continuous electroplating apparatus for steel strips, characterized in that a plating bath is formed by the strip electrode, the feed roll and the bottom sealing member by bringing the above into proximity with the upper surface of the bottom sealing member.