JP3995639B2 - Electrolytic treatment equipment - Google Patents

Description

  The present invention relates to an electrolytic treatment apparatus.

In the line where surface treatment such as plating is performed, the pre-treatment process that carries out pickling after carrying in the treated product, the surface treatment process such as plating, the treated product is washed out and carried out, and chromate treatment, etc. There are continuous processing methods that are installed in series and are continuously operated (see, for example, Patent Documents 1 to 4), and in this continuous processing method, a barrel that accommodates an article to be processed is included. There is a barrel system that travels in the order of processes and immerses the article to be plated in the treatment tank of each process (see, for example, Patent Documents 5 and 6).
Incidentally, FIG. 5 shows an example of the alkaline galvanizing apparatus 100 employed in one of the surface treatment lines which are a continuous treatment method and a barrel method. The alkaline galvanizing apparatus 100 includes a dissolution tank 102 separately from the plating tank 101, and galvanizes with a zincate bath by circulating a treatment liquid 103 between the plating tank 101 and the dissolution tank 102.

The plating tank 101 is provided with a pair of anodes 105 near the opposing walls in the tank. These anodes 105 have a flat plate shape, are made of iron, and are immersed in the treatment liquid 103 stored in the plating tank 101. Between these two anodes 105, a barrel 107 loaded with a workpiece 106 can be taken in and out by a lifting operation. Of course, this barrel 106 can also be immersed in the processing liquid 103 stored in the plating tank 101, and also serves as a cathode in this immersed state.
A plurality of zinc materials 109 are placed in the dissolution tank 102 via a cage-shaped storage container 108, and a processing liquid 103 recovered from the plating tank 101 and a processing liquid material 110 such as caustic soda added as necessary are included. By accumulating, the zinc material 109 is dissolved in the processing liquid 103 to the processing liquid material 110, and the plating component (zinc content) as the processing liquid 103 supplied to the plating tank 2 is adjusted to a predetermined concentration. Between the plating tank 101 and the dissolution tank 102, there are a supply pipe 113 for sending the treatment liquid 103 after concentration adjustment from the dissolution tank 102 to the plating tank 101 by a pump 112, and an overflow tank (part) 114 of the plating tank 101. A recovery pipe 115 for returning the processing solution 103 in the plating tank 101 to the dissolution tank 102 is provided.

Therefore, in the electrolytic treatment apparatus 1, the treatment liquid 103 is circulated in the direction of the dissolution tank 102, the supply pipe 113, the plating tank 101, the overflow tank 114, the recovery pipe 115, and the dissolution tank 102, Then, a positive current is applied to the anode 05 and a negative current is applied to the barrel 107 serving as the cathode while the workpiece 106 is immersed in the treatment liquid 103 together with the barrel 107, and the barrel 107 is rotated about the horizontal axis 116. As a result, the workpiece 106 in the barrel 107 is plated.
JP-A-8-176898 JP-A-9-195093 JP 2000-17492 A JP 2001-342599 A JP 2002-212791 A JP 2001-131798 A

  In the conventional standard alkaline galvanizing apparatus 100, for example, when the anode 105 of the plating tank 101 has a length of 400 mm and a width of 700 mm, the amount of the work 106 loaded in the barrel 107 is 50 kg. In this case, it takes a processing time (plating time) corresponding to 40 minutes to apply a predetermined plating thickness to the workpiece 106. This is the operation efficiency of the conventional common alkaline galvanizing apparatus 100 and the processing efficiency (productivity) of galvanizing. However, there has been a strong demand to increase the operating efficiency (zinc plating processing efficiency) in the alkaline galvanizing apparatus 100 as much as possible, and to increase the productivity as a plated product to reduce the cost.

  The present invention has been made in view of the above circumstances, and in a device for performing electrolytic treatment such as alkaline electroplating represented by alkaline zinc plating and pretreatment thereof, the treatment efficiency is increased as much as possible. An object of the present invention is to provide an electrolytic treatment apparatus capable of increasing the productivity of a treated product (such as a plated product as a final product) and reducing its cost.

In order to achieve the above object, the present invention has taken the following measures.
That is, the electrolytic processing apparatus according to the present invention has a processing bath for storing processing liquid 5 and insoluble counter electrode 7 provided in the treatment tank is immersed into the insoluble counter electrode 7 and the treatment liquid 5 in the processing bath alkaline electroplating or pretreated with energization between the workpiece 8 is cracking line, the workpiece 8 is immersed in the barrel 9 each processing liquid 5 in a state of being put into a barrel 9 which also serves as an electrode, this In the electrolytic processing apparatus in which the barrel 9 is rotatable in the processing liquid 5 around the horizontal axis 10 ,
The insoluble counter electrode 7, the rotation axis around the barrel 9 have bent in a U-shape or U-shape, a plurality of flat counter electrode structure member 16 which is arranged along the rotation axis direction of the barrel 9 The conductor 17 is connected and fixed in a skewered manner so that the interval between each other is constant,
The insoluble counter electrode 7 is formed of a front energizing surface formed by a plate edge portion facing all the workpieces 8 in all counter electrode components 16 and a plate surface portion extending from the front energizing surface in a direction away from the workpiece 8. It has a three-dimensional effective energizing surface as the sum of the lateral energizing surfaces ,
Each of the counter electrode components 16 is a U-shaped or U-shaped narrow strip that surrounds three sides of the barrel 9. When the barrel 9 is rotated between the individual counter electrode components 16, the counter electrode component 16 is rotated in the direction of rotation. A gap 18 through which the processing liquid 5 flows in the radial direction is provided .

The insoluble counter electrode 7 may be used as an anode or a cathode depending on the relative polar relationship with the workpiece 8.
As described above, the three-dimensional effective energizing surface of the insoluble counter electrode 7 is given as a total area including not only the front energizing surface directly facing the workpiece 8 but also the lateral energizing surface that is not directly facing the workpiece 8. As a result, the current-carrying area is as large as possible. In this way, it was confirmed that the processing time (plating time, etc.) can be significantly shortened by increasing the energization area. From this, drastic improvement in productivity and significant downsizing of the electrolytic treatment apparatus 1 as a whole can be achieved.

The work 8 may be immersed in the treatment liquid 5 together with the barrel 9 in a state where the work 8 is put in the barrel 9 which also serves as an electrode. In this case, if the barrel 9 can be rotated in the processing liquid 5 around the horizontal axis 10, the workpiece 8 can be stirred in the barrel 9, and the contact opportunity between the workpiece 8 and the processing liquid increases and the workpiece 8 is moved to. The electrification opportunity is also increased accordingly, which is also suitable for improving the processing efficiency.
In this case, the individual counter electrode components 16 constituting the insoluble counter electrode 7 may be formed in a U-shape or a U-shape along the rotation direction of the barrel 9, whereby the counter electrode components 16 are mutually connected. The gap 18 formed therebetween is also formed in a U shape or a U shape. Such a structure is convenient for realization.

The insoluble counter electrode 7 may have a structure in which a plurality of counter electrode components 16 are connected by a conductor 17 while a gap 18 is formed between them. In this case, it is preferable that the gap 18 is arranged so as to open in parallel with the front energizing surface of the three-dimensional effective energizing surface and to face the workpiece 8. By doing in this way, a front energization surface and a side energization surface are formed in each counter electrode component 16, and the energization area of the three-dimensional effective energization surface secured as a whole of the insoluble counter electrode 7 is And you can make it bigger.
It is preferable that the gap 18 formed between the counter electrode components 16 of the insoluble counter electrode 7 is released at least upward. By doing in this way, the gas generated during the electrolytic treatment is efficiently released upward from the side energization surface of each counter electrode component 16 through the gap 18, which is convenient for improving the efficiency of the treatment.

The insoluble counter electrode 7 may be provided at least on both sides of the workpiece 8 immersed in the treatment liquid 5. Further, it may be provided not only on both sides of the work 8 but also on the bottom, and may be arranged so as to surround three sides around the work 8. By doing in this way, the energization area of the solid effective energization surface secured as a whole of the insoluble counter electrode 7 can be increased more and more .
The A alkali resistance electroplating, there is an alkaline zinc plating or an alkaline zinc alloy plating. In these cases, the insoluble counter electrode includes any one of iron, nickel, cobalt, titanium, and carbon as a single material or as an alloy of two or more. In this case, the treatment tank is the plating tank 2, and the plating tank 2 is connected to the dissolution tank 3 in an internal communication, so that the treatment liquid 5 is circulated between the plating tank 2 and the dissolution tank 3. If it is a thing, alkaline galvanization by a zincate bath can be performed.

  On the other hand, as a pretreatment for alkaline electroplating, there is an alkaline electrolytic degreasing treatment, an alkaline electrolytic cleaning treatment or an acid electrolytic treatment.

  In the electrolytic treatment apparatus according to the present invention, in the apparatus for performing electrolytic treatment such as alkaline electroplating represented by alkaline zinc plating and its pretreatment, the treatment efficiency is dramatically increased, and the treated product (as a final product) As a result, the cost of the processed product (plated product as the final product) can be reduced. In addition, the overall apparatus can be greatly reduced in size.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of an electrolytic treatment apparatus 1 according to the present invention. The electrolytic treatment apparatus 1 of the first embodiment is applied as an alkaline galvanizing apparatus. That is, the electrolytic treatment apparatus 1 has a plating tank 2 and a dissolution tank 3 connected to the plating tank 2 so as to communicate with the inside of the plating tank 2. An insoluble counter electrode 7 is provided in the immersed state. Further, a work 8 (for example, a bolt or a nut) is immersed in the treatment liquid 5 in the plating tank 2, and the work 8 is, for example, a barrel 9 that can be taken in and out of the plating tank 2 by an elevating operation. In this state, the barrel 9 is immersed in the treatment liquid 5 in the plating tank 2. A positive current is applied to the insoluble counter electrode 7 and a negative current is applied to the barrel 9. As a result, the insoluble counter electrode 7 is used as an anode and the work 8 is used as a cathode.

Therefore, in this electrolytic treatment apparatus 1, the treatment liquid 5 is constantly or intermittently circulated between the plating tank 2 and the dissolution tank 3 to keep the plating component of the treatment liquid 5 at a predetermined concentration, and in the plating tank 2. The workpiece 8 is subjected to electrolytic treatment (zinc plating with a zincate bath).
As is apparent from FIG. 2, the barrel 9 has a horizontally long cylindrical shape, and an outer peripheral surface 9a thereof is formed of a mesh material, a perforated plate, or the like. Accordingly, the processing liquid 5 enters the barrel 9 from the outer peripheral surface 9a and can come into contact with the work 8 inside. The barrel 9 is formed of a conductive material or a part of or the whole of a mesh member or a perforated plate forming the outer peripheral surface 9a, or a frame portion supporting these, or a lead wire is installed in the barrel 9. By doing so, it can also serve as a cathode.

The barrel 9 is rotatable about a horizontal axis 10 passing through the center of the cylindrical shape as a rotation axis. That is, a rotation drive motor 12 is connected to the horizontal shaft 10 via a transmission mechanism 11 such as a gear device, and the rotation of the rotation drive motor 12 can give the barrel 9 independent rotation control. It is like that.
The insoluble counter electrode 7 has a groove-like block shape with a U-shaped side surface as a whole. The U-shaped inner dimension is formed to be wider than the outer diameter of the barrel 9 so that an appropriate empty space can be secured on both sides of the barrel 9 after being accommodated. Accordingly, when the barrel 9 is immersed in the processing solution 5 of the plating tank 2, the insoluble counter electrode 7 is located on both sides (the left and right sides in FIG. 1) of the workpiece 8 loaded in the barrel 9. It is arranged to surround the three sides, the bottom and the bottom.

The insoluble counter electrode 7 is configured by arranging a plurality of flat counter electrode components 16 in parallel along the rotational axis direction of the barrel 9 (longitudinal direction of the horizontal axis 10). Each counter electrode component 16 is formed in a U shape surrounding three sides of the barrel 9. The counter electrode component 16 is made of any one of iron, nickel, cobalt, titanium, and carbon as a single material or as an alloy of two or more. In the first embodiment, an iron flat bar having a strip shape is bent in the plate width direction to form a U shape.
Each counter electrode component 16 is connected and fixed in a skewered manner with a conductor 17 formed in a rod shape with a conductive material so that the interval between the counter electrodes is constant. A predetermined gap 18 is formed in the. The conductors 17 are provided at a total of three locations including both end portions (upper end portions) and intermediate portions (lowermost portions) of the counter electrode component 16 having a U-shape. Therefore, the gap 18 provided between the counter electrode components 16 also has a U-shape as a whole. Such a gap 18 opens toward the workpiece 8 loaded in the barrel 9 and penetrates the wall thickness of the insoluble counter electrode 7 as a whole. Moreover, the entire area of the gap 18 is released upward. It can also be said that the gap 18 becomes a groove-like flow hole that escapes radially outward along the direction of rotation of the barrel 9 (the treatment liquid 5 can be moved back and forth).

  Since the insoluble counter electrode 7 has such a configuration, the insoluble counter electrode 7 includes a front energization surface formed by a portion facing the work 8 (corresponding to the block inner surface of the U-shaped grooved block), and the front energization surface. 3D effective energizing surface as the sum of the lateral energizing surfaces formed by portions extending from the workpiece 8 in the direction away from the work 8 (both front and back surfaces of each counter electrode component 16 and corresponding to the inner surface where the gap 18 is formed) It will have. That is, the energization area for the work 8 is as large as possible. In addition, the gaps 18 formed between the counter electrode components 16 are opened side by side over substantially the entire area of the front conductive surface of the insoluble counter electrode 7, and sufficiently ensure the flowability of the processing liquid 5. However, it also plays a role of preventing the gas generated during the electrolytic treatment to escape upward. From these things, the processing time (plating time) of the electrolytic treatment is dramatically shortened.

In addition, since each counter electrode component 16 is formed in a U shape in the first embodiment as described above, the U-shaped inner peripheral surface and the outer peripheral surface 9 a of the barrel 9 are formed as the entire insoluble counter electrode 7. Is a substantially constant interval except for the upper part of the barrel 9.
The configuration other than the plating tank 2 is substantially the same as the conventional one. That is, a plurality of zinc materials 24 are placed in the dissolution tank 3 via a cage-like container 23, and the processing liquid 5 collected from the plating tank 2 and a processing liquid material 25 such as caustic soda added as necessary. And the zinc material 24 is dissolved in the treatment liquid 5 to the treatment liquid material 25, and the plating component (zinc content) as the treatment liquid 5 supplied to the plating tank 2 is adjusted to a predetermined concentration. . Between the plating tank 2 and the dissolution tank 3, there are a supply pipe 27 that sends the treatment liquid 5 after concentration adjustment from the dissolution tank 3 to the plating tank 2 by a pump 26, and an overflow tank (part) 28 of the plating tank 2. A recovery pipe 29 for returning the treatment liquid 5 in the plating tank 2 to the dissolution tank 3 is provided.

In this electrolytic treatment apparatus 1, the circulation of the treatment liquid 5 is continuously or intermittently repeated in the direction of the dissolution tank 3, the supply pipe 27, the plating tank 2, the overflow tank 28, the recovery pipe 29, and the dissolution tank 3. In the figure, a positive current is applied to the insoluble counter electrode 7 and a negative current is applied to the barrel 9 while the workpiece 8 is immersed in the treatment liquid 5 together with the barrel 9, and the barrel 9 is rotated about the horizontal axis 10. As a result, the workpiece 8 in the barrel 9 is plated.
FIG. 3 relates to the second embodiment of the electrolytic treatment apparatus 1 according to the present invention, and shows an insoluble counter electrode 7 provided in the plating tank 2 in the second embodiment. The insoluble counter electrode 7 used in the second embodiment is an application example of the first embodiment (see FIG. 2). In other words, the insoluble counter electrode 7 is not formed by bending each flat electrode member 16 into a U-shape by one flat bar, but three thin strip-like flat bars along the rotation direction of the barrel 9. Are connected in a U-shape. The connecting portion of each flat bar may be bolted, riveted, or welded .

Arrangement direction of the respective counter electrode structure member 16 is to that along the direction of rotation of the barrel 9. Each counter electrode component 16 is connected and fixed in a skewered manner by a conductor 35 formed in a rod shape and bent in a U shape by a conductive material so that a predetermined interval is provided between them. Yes. For this reason, a groove-like gap 18 along the rotational axis direction of the barrel 9 (longitudinal direction of the horizontal axis 10) is formed between the parallel arrangements of the counter electrode components 16 .

With respect to the first embodiment (see FIGS. 1 and 2), the following apparatus is manufactured and the results of actual alkaline galvanization are shown below.
The size of the insoluble counter electrode 7 was 400 mm in length (H dimension in FIG. 2) and 700 mm in width (L dimension in FIG. 2). Further, the plate width center radius (R dimension in FIG. 2) of the U-bent portion of each counter electrode component 16 is 300 mm, the plate width (W dimension in FIG. 2) of each counter electrode component 16 is 50 mm, and the plate thickness. Was 3 mm. The total number of counter electrode components 16 is 70, and the parallel pitch is 10 mm. In addition to using such an insoluble counter electrode 7, the voltage value, the concentration of the treatment liquid 5, etc. are shown in FIG. 8 for the conventional electrolytic treatment apparatus 100 (the plate-like anode 105 having a length of 400 mm and a width of 700 mm is provided in the plating tank 101. Alkaline galvanization with a zincate bath was performed in exactly the same manner as that in which two sheets were provided. The workpiece 8 was an M5 × 25 bolt for 50 kg. This is also matched to the work 106 in the conventional case.

As a result of alkaline galvanization performed under such various conditions, the electrolytic treatment apparatus 1 of the present invention was able to perform galvanization with a predetermined plating thickness on the workpiece 8 in less than 15 minutes. Since the conventional electrolytic treatment apparatus 100 shown in FIG. 5 requires a processing time (plating time) equivalent to 40 minutes as described above, the time can be reduced to almost 1/3. Become.
In consideration of this, the area to be treated (surface area to be plated) of the workpiece 8 is approximately 745 dm ² (abbreviated simply as “deci” in field terms), whereas the insoluble counter electrode of the electrolytic treatment apparatus 1 of the present invention. 7, the surface area of the three-dimensional effective energization surface (that is, the entire energization area) is approximately 940 dm ² . On the other hand, even if two anodes 105 provided in the conventional electrolytic treatment apparatus 100 are combined, the total energization area of them is only 56 dm ² at most. That is, by using the electrolytic treatment apparatus 1 of the present invention, it is possible to flow a larger current than the conventional electrolytic treatment apparatus 100 at the same voltage value. Thus, it can be said that the processing time (plating time) is drastically shortened in the electrolytic processing apparatus 1 according to the present invention.

  In the insoluble counter electrode 7, good results were obtained even when the parallel arrangement pitch of the counter electrode component 16 was variously changed between 5 and 15 mm.

The present invention is not limited to the above-described embodiments, and can be appropriately changed according to the embodiments. For example, non-soluble counter electrode 7 may be provided on the side or the bottom side of the one with respect to the workpiece 8 only just. In the insoluble counter electrode 7, it is possible to partially change the material of the counter electrode component 16 or to incorporate the counter electrode component 16 of a different material. The gap 18 provided between the counter electrode components 16 may be a hole shape, or the gap 18 may not be provided. For example, it is possible to form the counter electrode component 16 in the form of an accordion curtain shape or a corrugated plate shape (the cross section along the horizontal axis 10 of the barrel 9 is zigzag). In such an insoluble counter electrode 7, the surface facing the workpiece 8 is formed as an uneven or undulating surface, but the front energizing surface is the portion closest to the workpiece 8 (the portion that is convex when viewed from the workpiece 8). The lateral energization surface is formed at a portion that is formed and extends obliquely in a direction away from the workpiece 8 starting from the front energization surface (a portion that is concave when viewed from the workpiece 8).

FIG. 4 shows an example of a line configuration for performing alkaline galvanization, and it has been explained that the electrolytic treatment apparatus 1 of the first to second embodiments can be adopted in the plating process included in this line. In this line, alkaline electrolytic degreasing treatment, alkaline electrolytic cleaning treatment, acid electrolytic treatment and the like are provided as pretreatment steps leading to plating treatment. The electrolytic treatment apparatus 1 according to the present invention can also be applied to the preliminary degreasing tank 50, the degreasing tank 51, the pickling tank 52, the electrolytic tank 53, and the like used in these processes. When implemented as the preliminary degreasing tank 50 or the degreasing tank 51, the insoluble counter electrode 7 can be used as an anode or a cathode, and when implemented as the pickling tank 52, the insoluble counter electrode 7 serves as an anode. When used as the electrolytic cell 53, the insoluble counter electrode 7 is used as a cathode. Furthermore, in the case of acid electrolysis, the insoluble counter electrode 7 is also used as a reversal of the anode and cathode at high speed.

  The barrel 9 can be a water-permeable container.

It is the front view which showed 1st Embodiment of the electrolytic processing apparatus (applied as an alkaline galvanizing apparatus) which concerns on this invention. It is the perspective view which showed the insoluble counter electrode used in 1st Embodiment. It is the perspective view which showed the insoluble counter electrode used in 2nd Embodiment. It is the top view which showed the example of a line structure for implementing galvanization . It is the front view which showed an example of the conventional alkaline zinc plating apparatus .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Alkaline galvanizing apparatus 2 Plating tank 3 Dissolution tank 5 Treatment liquid 7 Insoluble counter electrode 8 Work piece 9 Barrel 10 Horizontal axis 16 Counter electrode constituent material 17 Conductor 18 Gap

Claims (8)

Treatment solution and a insoluble counter electrode provided in (5) and the processing bath for storing the processing tank (7) was immersed in this insoluble counter electrode (7) and the processing liquid in the processing bath (5) in the workpiece ( We alkaline electroplating or rows before treatment energization between 8), the work (8) is the barrel (9) for each processing solution while being placed in a barrel (9) which also serves as an electrode (5) in In the electrolytic processing apparatus in which the barrel (9) is rotatable in the processing liquid (5) around the horizontal axis (10) ,
The insoluble counter electrode (7) is a rotation axis around the barrel (9) have bent in a U-shape or U-shape, the plurality being arranged along the rotation axis direction of the barrel (9) flat The counter electrode component (16) is connected and fixed in a skewered manner with a conductor (17) so that the interval between each other is constant,
The insoluble counter electrode (7) has a front energization surface formed by a plate edge portion facing all the work (8 ) in all counter electrode components (16) and a direction away from the work (8) starting from the front energization surface. It has a three-dimensional effective energizing surface as a sum total with the side energizing surface formed by the extending plate surface part ,
Each of the counter electrode components (16) is a U-shaped or U-shaped strip that surrounds three sides of the barrel (9), and the barrel (9) is interposed between the individual counter electrode components (16). An electrolytic processing apparatus characterized by being provided with a gap (18) through which the processing liquid (5) flows in the radial direction along the direction of rotation when rotated .   The insoluble counter electrode (7) has a structure in which a plurality of counter electrode components (16) are connected by a conductor (17) while forming a gap (18) between them, and the gap (18) 2. The electrolytic treatment apparatus according to claim 1, wherein the three-dimensional effective energizing surface is arranged side by side on the front energizing surface and is arranged to face the workpiece (8).   3. The electrolytic processing apparatus according to claim 2, wherein a gap (18) formed between the counter electrode constituent members (16) of the insoluble counter electrode (7) is released at least upward.   The said insoluble counter electrode (7) is provided in the at least both sides with respect to the workpiece | work (8) immersed in the process liquid (5) in any one of Claim 1 thru | or 3 characterized by the above-mentioned. The electrolytic treatment apparatus described.   The insoluble counter electrode (7) is provided not only on both sides of the work (8) immersed in the treatment liquid (5) but also on the bottom, and is arranged around three sides around the work (8). The electrolytic treatment apparatus according to claim 4, wherein the electrolytic treatment apparatus is provided. Alkaline zinc plating or alkaline zinc-based alloy plating is selected as the alkaline electroplating, and the insoluble counter electrode (7) is made of any one of iron, nickel, cobalt, titanium, and carbon as a single material or two or more kinds 6. The electrolytic processing apparatus according to claim 1, wherein the electrolytic processing apparatus is provided as an alloy . The treatment tank is a plating tank (2), and a dissolution tank (3) is connected to the plating tank (2) in an internal communication, and the treatment is performed between the plating tank (2) and the dissolution tank (3). The electrolytic treatment apparatus according to claim 6, wherein the liquid (5) can be circulated . The electrolytic treatment apparatus according to any one of claims 1 to 5 , wherein an alkaline electrolytic degreasing treatment, an alkaline electrolytic cleaning treatment, or an acid electrolytic treatment is selected as a pretreatment for the alkaline electroplating .

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