JPH10110291A - Electroplating tank with tree tin prevention function - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an electroplating tank capable of preventing current from flowing around and reliably preventing the occurrence of tree tines regardless of the width of a steel strip. SOLUTION: Both edges 14, 1 of steel strips 13, 13a are provided.
First current shielding plates 22 and 23 extending toward the tank walls 20 and 21 of the tank body 10 are continuously provided on the back surfaces of the edge masks 16 and 17 into which the respective 5, 14a and 15a are inserted. According to the width of the edge mask 13a, the edge masks 16, 17
Are paired with the second current shielding plates 24 and 25 in the electroplating tank A having a tree tinning prevention function that is movable in the width direction together with the first current shielding plates 22 and 23.
Are respectively disposed in front of the first current shielding plates 22 and 23, one end of each of the second current shielding plates 24 and 25 is connected to the tank walls 20 and 21 of the tank body 10, and the other end is It extends to the position reaching the back of the edge masks 16 and 17 at the maximum expansion position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electroplated steel sheet,
In particular, the present invention relates to an electroplating tank having a tree tin preventing function capable of preventing current from flowing around and reliably preventing the occurrence of tree tin, regardless of the width of the steel strip, in the production of a material having a different thickness.

[0002]

2. Description of the Related Art Conventionally, an electroplating tank B having the configuration shown in FIGS. 8 and 9 has been proposed as an electroplating tank for electroplating both sides of a steel strip. As shown in the figure, a pair of plate-like electrodes 81 and 82 are disposed in the tank main body 80 at a narrow parallel interval, and steel strips 83 and 83a are passed between the electrodes 81 and 82. ing. Wide steel strip 83
Or both edges 84, 85 or 84 of the narrow steel strip 83a
A pair of edge masks 86 and 87 having a U-shaped cross section are provided in a state opposite to the edge masks 8a and 85a.
Both edges 84, 85 or 84a, 85a of the steel strip 83 or 83a are inserted into the grooves 88, 89 of 6, 87, respectively. Also, on the back surface of each edge mask 86, 87,
Current shielding plates 92 and 93 made of FRP extending toward the tank walls 90 and 91 of the tank main body 80 are continuously provided. Then, as shown in FIGS. 8 and 9, the edge masks 86 and 87 are moved along the width of the steel plates 83 and 83a to be electroplated with the current shielding plates 92 and 93 so as to be able to expand and contract in the width direction.

In such a configuration, the current shielding plates 92, 9
3 prevents tree tinting by preventing current from flowing between the electrodes 81 and 82. Here, tree tin is a phenomenon in which tin precipitates on an electrode. As a cause of the occurrence, a current flows from a higher potential to a lower potential due to a potential difference between the electrodes on the front and back surfaces when the thick material is passed through. Refers to the phenomenon of tin plating. When this tree tin occurs, it tends to become a pressing flaw, so it is necessary to stop the operation and remove the tree tin.

[0004]

However, the above-described electroplating tank B still has the following problems to be solved. That is, when the electroplating tank B is used for manufacturing a material with a different thickness, as shown in FIG.
Since the outer edges 92a, 93a of the current shielding plates 92, 93 are close to the tank walls 90, 91 of the tank body 80, the current shielding plates 92, 93 can prevent the current from flowing around, and the electrodes 81, 82 Tree tin can be prevented from occurring.

However, as shown in FIG. 9, when the steel strip 83a is narrow, the current shielding plates 92 and 93 move inward along with the inward movement of the edge masks 86 and 87, and the current shielding plates 92 and 93 move inward. Outer edges 92a, 93a of 92, 93 and tank body 80
A large gap is generated between the first and second tank walls 90 and 91, and a current flows around the gap. As a result, a current flows between the electrodes 81 and 82, and tree tines occur at the electrodes 81 and 82.

[0006] The present invention has been made in view of such circumstances, and in the production of electroplated steel sheets, particularly, a material having a different thickness, it is possible to prevent the current from flowing around regardless of the width of the steel strip. An object of the present invention is to provide an electroplating tank having a tree tin preventing function capable of reliably preventing tree tin from occurring.

[0007]

According to the present invention, there is provided a semiconductor device comprising:
The electroplating tank having the described tree tin prevention function is
A pair of plate-shaped electrodes is disposed in the tank body at a narrow parallel interval, and a pair of U-shaped cross-sections is formed in a state opposite to both edges of the steel strip passed between the electrodes. An edge mask is provided, both edges of the steel strip are respectively inserted into grooves of the edge mask, and a first current shielding plate extending toward a tank wall of the tank body is provided on a back surface of each edge mask. An electroplating tank having a tree tin preventing function, which is continuously provided, and in which the edge mask is slidably moved in the width direction together with the first current shielding plate in accordance with the width of the steel strip. In the main body, a pair of second current shielding plates are respectively disposed in front of the first current shielding plate, and one end of each of the second current shielding plates is connected to a tank wall of the tank body. And the other end is on the back of the edge mask in the maximum extended position. It is up to a position where the distracted.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. First, an overall configuration of an electroplating tank A having a tree tining prevention function according to an embodiment of the present invention will be described with reference to FIGS. As shown in the figure, a pair of plate-like electrodes 11 and 12 are disposed in a tank body 10 at narrow parallel intervals and are arranged.
Wide steel strip 13 or narrow steel strip 13 between 1 and 12
a is passed through. Both edges 1 of steel strips 13 and 13a
A pair of U-shaped cross-section edge masks 16 and 17 are provided in a state opposite to 4, 15, 14a and 15a.
Steel strips 13 are provided in the grooves 18 and 19 of the edge masks 16 and 17.
Both edges 14, 15, 14a, 15a of 13a are inserted respectively.

On the back surface of each of the edge masks 16 and 17, there is provided a first current shield plate 22, 2 made of an insulator, for example, FRP, extending toward the tank walls 20, 21 of the tank body 10.
3 are connected in series. Then, the edge masks 16 and 17
As shown in FIGS. 1 and 2, the first current shielding plates 22 and 23 correspond to the widths of the steel strips 13 and 13a to be electroplated.
In addition, it is movable in the width direction so as to be able to expand and contract. Further, in the present embodiment, as shown in FIGS. 1 and 2, second current shielding plates 24 and 25 made of an insulator, for example, FRP are arranged in front of the first current shielding plates 22 and 23. Has been established. One end of each current shielding plate 24, 25 is connected to the tank wall 20 of the tank body 10,
The other end is extended to a position reaching the back of the edge masks 16 and 17 at the maximum expansion position.

Next, a description will be given of a plating operation using the electroplating tank A having the tree tinning prevention function having the above-described configuration. That is, when the electroplating tank A is used for manufacturing a material having a different thickness, as shown in FIG. 1, when the steel strip 13 is wide, the outer edges of the first current shielding plates 22 and 23 are And one end of each of the second current shielding plates 24 and 25 is also close to the tank walls 20 and 21 of the tank body 10.
21 and the other end extends to a position reaching the backs of the edge masks 16 and 17 at the maximum expansion position, so that the first current shielding plates 22 and 23 and the second current shielding plates 24 and 25 are provided. Can reliably prevent the current from sneaking around, and can prevent the generation of tree tines on the electrodes 11 and 12.

As shown in FIG. 2, when the steel strip 13a is narrow, the first current shielding plates 22, 23 also move inward along with the inward movement of the edge masks 16, 17,
A large gap is generated between the outer edges of the first current shielding plates 22 and 23 and the tank walls 20 and 21 of the tank body 10. However, in the present embodiment, as shown in FIG. 2, the second current shielding plates 24, 2 are located in front of the first current shielding plates 22, 23.
5, one end of each current shielding plate 24, 25 is connected to the tank walls 20, 21 of the tank body 10, and the other end reaches the back of the edge masks 16, 17 in the maximum expansion position. As a result, it is possible to reliably prevent the current from wrapping around, and to prevent tree tines from being generated on the electrodes 11 and 12.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electroplating tank having a tree tin preventing function according to an embodiment of the present invention is provided with an existing electroplating tank A1.
The case where the present invention is applied will be described below with reference to FIGS. As shown in the figure, the existing electroplating bath A1 is a vertical electroplating bath, and a pair of plate-shaped electrodes 31 and 32 are arranged in a vertical tank main body 30 at narrow parallel intervals. The steel strip 33 is passed between the electrodes 31 and 32. A pair of U-shaped cross-section edge masks 36 and 37 facing the two edges 34 and 35 of the steel strip 33, respectively.
Are provided, grooves 38 of edge masks 36 and 37,
Both edges 34 and 35 of the steel strip 33 are inserted into 39.

On the back surface of each of the edge masks 36 and 37, first current shielding plates 42 and 43 extending toward the tank walls 40 and 41 of the tank body 30 are provided continuously. Then, as shown in FIGS. 4 and 5, the edge masks 36 and 37 are provided on the first current shielding plate 4 according to the width of the steel strip 33 to be electroplated.
It is moved so as to be able to expand and contract in the width direction together with 2, 43. That is,
As shown in FIG. 3, a rotary screw shaft 45 driven by a motor 44 is provided above the electroplating tank A1, and the rotary screw shaft 45 has forward and reverse screws 46 and 47 formed therein. I have. Sliding blocks 48 and 49 are screwed into the forward and reverse screws 46 and 47, respectively, and the sliding blocks 48 and 49 are fixed to the upper portions of the edge masks 36 and 37, respectively. It is fixedly connected to the moving tables 50 and 51.

Accordingly, the distance between the edge masks 36 and 37 is adjusted by driving the motor 44 to move the moving tables 50 and 51 symmetrically close to and away from the center line of the electroplating tank A1. Can be adjusted. Existing electroplating tank A having the above configuration
The first current shielding plates 52 and 53 are attached to 1 as follows. That is, as shown in FIGS.
2 are bent toward the first current shielding plates 42 and 43 on both sides of the electrode mounting plate 55 to which the L-shaped portions 56 are attached.
A second current shielding plate 52, 53 is provided between the L-shaped portions 56, 57 and the tank body 30. In addition, as shown in FIG. 4, the electrode 31 is mounted on an electrode mounting plate 54.

For the electroplating tank A1 having the second current shielding plates 52 and 53 and the electroplating tank A1 not having the second current shielding plates 52 and 53, the steel strip 33 which is a material having a different thickness and a narrow width is used. An experiment was performed to determine whether or not tree tines 58 and 59 (see FIGS. 6 and 7) occur on the electrodes 31 and 32 when electroplating was performed. The results are shown below. In the experiment, the rectifier on the front side of the steel strip 33 was turned off, and the rectifier on the back side was turned on, so that the steel strip 33 was operated such that the potential difference between the front side and the back side became large. As shown in FIG. 6, when the electroplating tank A1 did not include the second current shielding plates 52 and 53, a severe tree tin 58 occurred over the entire length of the electrodes 31 and 32. In contrast, FIG.
As shown in the figure, the electroplating tank A1 is the second current shielding plate 5
In the case where the electrodes 2 and 53 were provided, the tree tines 59 were slightly generated above the electrodes 31 and 32.

As described above, the present invention has been described with reference to an embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described.

[0017]

According to the first aspect of the present invention, in the electroplating tank having a tree tin preventing function, the first edge of the steel strip extends toward the tank wall of the tank body behind the edge mask into which both edges of the steel strip are inserted. In the electroplating tank having a tree tin prevention function, a current shield plate is continuously provided, and an edge mask is slidably moved in the width direction together with the first current shield plate according to the width of the steel strip. A second current shielding plate is disposed in front of the first current shielding plate, and one end of each of the second current shielding plates is connected to the tank wall of the tank body and the other end is in the maximum expanded position. It extends to a position reaching the back of an edge mask.

Therefore, when the narrow steel strip is electroplated, the first current shielding plate moves inward, and a large gap is formed between the outer edge of the first current shielding plate and the tank wall of the tank body. Even in the case of occurrence of spills, the second current shielding plate can reliably prevent the current from sneaking, and can prevent tree tines from occurring in the electrodes.

[Brief description of the drawings]

FIG. 1 is a conceptual configuration explanatory view in a case where a wide steel strip of an electroplating tank having a tree tin prevention function according to an embodiment of the present invention is electroplated.

FIG. 2 is a conceptual configuration explanatory view in a case where a narrow steel strip of an electroplating tank having a tree tin prevention function according to one embodiment of the present invention is electroplated.

FIG. 3 is a front view showing a specific configuration of an electroplating tank.

FIG. 4 is a partial plan view of the same.

FIG. 5 is an enlarged explanatory view of the main part.

FIG. 6 is an explanatory diagram showing a state of occurrence of tree tin on an electrode in a current plating operation using an existing electroplating tank without a second current shielding plate.

FIG. 7 is an explanatory diagram showing a state of occurrence of tree tinning on an electrode in a current plating operation when a second current shielding plate is attached to an existing electroplating tank.

FIG. 8 is a conceptual configuration explanatory view when a wide steel strip is electroplated in a conventional electroplating tank.

FIG. 9 is a conceptual configuration explanatory view in the case of electroplating a narrow steel strip in a conventional electroplating tank.

[Explanation of symbols]

A electroplating tank A1 electroplating tank 10 tank body 11 electrode 12 electrode 13 steel strip 13a steel strip 14 edge 14a edge 15 edge 15a edge 16 edge mask 17 edge mask 18 groove 19 groove 20 tank wall 21 tank wall 22 first current Shield plate 23 first current shield plate 24 second current shield plate 25 second current shield plate 30 tank body 31 electrode 32 electrode 33 steel strip 34 edge 35 edge 36 edge mask 37 edge mask 38 groove 39 groove 40 tank wall 41 tank wall 42 first current shielding plate 43 first current shielding plate 44 motor 45 rotating screw shaft 46 forward screw 47 reverse screw 48 sliding block 49 sliding block 50 moving table 51 moving table 52 second current shielding plate 53 second current shielding plate 54 current mounting plate 55 current mounting plate 56 L-shaped portion 57 L-shaped portion 5 Tree Tin 59 tree Tin

Claims (1)

[Claims] 1. A pair of plate-like electrodes arranged at a narrow parallel interval in a tank main body are arranged, and are paired with each other so as to face both edges of a steel strip passed between the electrodes. An edge mask having a U-shaped cross section is provided, and both edges of the steel strip are inserted into grooves of the edge mask, respectively, and a first extending toward the tank wall of the tank body is provided on the back surface of each of the edge masks. An electroplating having a tree tin preventing function in which a current shield plate is continuously provided, and the edge mask is slidably movable in the width direction together with the first current shield plate according to the width of the steel strip. In the tank, a pair of second current shielding plates are respectively disposed in front of the first current shielding plate in the tank main body, and one end of each of the second current shielding plates is provided in the tank main body. The edge mass connected to the tank wall and the other end is in the maximum expansion position. Electroplating bath having a tree Ting prevention function which is characterized in that the cast position Shin until reaching the back.