JP2017210667A - Inner electrode for inner surface plating of tubular article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner electrode for plating an inner surface of a long life tubular article which plates an inner surface of a long tubular article.SOLUTION: When electroplating a tubular article 20, in an inner electrode 10 for plating an inner surface of the tubular article 20 that is used by inserting into an interior of the tubular article 20 for applying the electroplating on an inner surface of the tubular article 20, the inner electrode 10 includes an inner electrode connection part 16 that contacts with a power supply and a long inner electrode wire 11 formed of a conductor. The inner electrode wire 11 is provided with a conductive inner electrode wire cover member 15 at a part where the inner electrode wire 11 and a plating liquid 2 contact and on an outer surface where a current of an amount larger than other part of the inner surface electrode wire 11 flows.SELECTED DRAWING: Figure 3

Description

The present invention relates to an inner surface electrode for inner surface plating used for electroplating an inner surface of a tubular article. In particular, the present invention relates to an inner surface electrode for inner surface plating of a tubular article used by being inserted into the inside of the tubular article in order to perform electroplating on the inner surface of a long tubular object such as a filler pipe of an automobile.

Conventionally, in order to perform electroplating on a metal article, an electrode and an object to be plated are immersed in a plating solution in a plating tank, and an electrode is used as an anode and an object to be plated is used as a cathode. The ionized metal inside was deposited on the object to be plated for plating.
However, the flow of electricity is poor on the inner surface side of the long tubular article, and the plating metal is not deposited on the inner surface of the tubular article.

Therefore, as shown in FIG. 1, the inner surface electrode 110 is inserted into the filler pipe 120, and the inner surface of the filler pipe 120 is plated with the inner surface electrode 110. As shown in FIG. 6, the inner surface electrode 110 includes an inner surface electrode connection portion 116 and an inner surface electrode wire 111 that are attached to the hanger.

The inner surface electrode wire 111 is formed to be bendable along the bend of the filler pipe 120, and is formed of a wire in which a conductive metal wire is knitted. The surface of the inner surface electrode wire 111 is covered with a non-conductive synthetic resin thread 117 such as nylon so that the inner surface electrode wire 111 does not contact the inner surface of the filler pipe 120. For this reason, the plating solution 2 and the inner surface electrode wire 111 are in contact with each other so that a current flows between the inner surface electrode wire 111 and the inner surface of the filler pipe 120 (see, for example, Patent Document 1).

As shown in FIG. 7, when the inner surface is plated by immersing the filler pipe 120 in the plating solution 2, power is supplied to the inner surface electrode connecting portion 116 from the power source in order to supply electricity to the inner surface electrode 110. In this case, when the inner surface of the tubular article such as the filler pipe 120 is plated, electricity flows through the root portion 112 of the inner surface electrode wire 111 of the inner surface electrode 110 (portion indicated by a dotted line A in FIG. 7). Cheap. In particular, when the flange portion that protrudes to the inner surface is provided on the inlet side like the filler pipe 120, the distance from the inner surface electrode wire 111 is narrowed, and electricity is more likely to flow.

In this case, as shown in FIG. 8, the anodic reaction of the root portion 112 of the inner surface electrode wire 111 is increased, and only the root portion 112 is excessively dissolved in the plating solution 2 to form the inner surface electrode wire recess 111a. The inner surface electrode wire 111 will be broken.
The portions other than the root portion 112 of the inner surface electrode wire 111 are hardly melted, and the life of the inner surface electrode wire 111 is shortened by melting only the root portion 112.

JP 2011-219811 A

  Therefore, an object of the present invention is to provide an inner surface electrode for inner surface plating of a long-lived tubular article, in which the inner surface of a long tubular article is plated.

The present invention of claim 1 for solving the above-described problem is a tubular article used by being inserted into a tubular article for electroplating the inner surface of the tubular article when electroplating the tubular article. In the inner surface electrode for inner surface plating,
The inner surface electrode has an inner surface electrode connecting portion that is connected to a power source and a long inner surface electrode wire formed of a conductor, and the inner surface electrode wire is a portion where the inner surface electrode wire and the plating solution are in contact, and An inner surface electrode for inner surface plating of a tubular article, characterized in that a conductive inner surface electrode wire cover member is attached to the outer surface of a portion where more current flows than other portions of the inner surface electrode wire.

In the first aspect of the present invention, the inner surface electrode has an inner surface electrode connecting portion that is connected to the power source. Therefore, by attaching the inner surface electrode connecting portion to a plating hanger or the like, current flows to the inner surface electrode wire via the inner surface electrode connecting portion. Can flow.

The inner surface electrode has a long inner surface electrode line formed of a conductor. For this reason, it can insert over the full length of a long tubular article, can flow an electric current reliably to the inner surface of a tubular article, and can plated inside over the full length of the inner surface of a tubular article. As long as the long tubular article is linear, the inner surface electrode wire can be linearly rigid, and if the tubular article is bent, it has linear flexibility. Can be used.

The inner surface electrode wire has a conductive inner surface electrode wire cover member attached to the outer surface of the portion where the inner surface electrode wire and the plating solution are in contact with each other and where the current flows more than the other portions of the inner surface electrode wire. For this reason, the inner electrode wire cover member dissolves before the inner electrode wire in a portion where a large amount of current flows through the inner electrode wire, thereby preventing the inner electrode wire from being dissolved and preventing the inner electrode wire from being broken. The life of the inner electrode wire can be extended.

According to a second aspect of the present invention, the inner surface electrode wire is an inner surface electrode for inner surface plating of a tubular article formed by knitting a number of metal wires having flexibility.

In the present invention of claim 2, the inner surface electrode wire has flexibility and is formed by knitting a number of metal wires. For this reason, even if the tubular article is formed by bending, the inner surface electrode can be flexibly deformed along the bending and can be inserted over the entire length of the long tubular article. Plating can be applied over
Since it is formed by knitting a large number of metal wires, it has a predetermined rigidity and can be easily inserted up to the tip of a tubular article, has electrical conductivity and is excellent in durability.

According to a third aspect of the present invention, the inner surface electrode wire cover member is an inner surface electrode for inner surface plating of a tubular article made of stainless steel.

In the present invention of claim 3, since the inner surface electrode wire cover member is made of stainless steel, it has conductivity, is hard to be corroded by a plating solution and other chemicals, has rigidity, and has excellent durability. ing.

The present invention of claim 4 is an inner surface electrode for inner surface plating of a tubular article in which the inner surface electrode wire and the inner surface electrode wire cover member are both made of stainless steel 316 (SUS316).

In the present invention of claim 4, since both the inner surface electrode wire and the inner surface electrode wire cover member are made of stainless steel 316 (SUS316), they are particularly excellent in corrosion resistance and excellent in durability. Since the inner surface electrode wire and the inner surface electrode wire cover member are made of the same stainless steel 316 (SUS316), they can be reliably dissolved from the inner surface electrode wire cover member.

According to the fifth aspect of the present invention, the portion of the inner surface electrode wire in contact with the plating solution and the portion where the current flows more than the other portion of the inner surface electrode wire is close to the inlet portion of the tubular article. It is an inner surface electrode for inner surface plating of the tubular article which is a part of an inner surface electrode wire.

According to the fifth aspect of the present invention, the portion of the inner surface electrode wire in contact with the plating solution and the portion where the current flows more than the other portion of the inner surface electrode wire is close to the inlet portion of the tubular article. It is a part of the inner surface electrode wire. For this reason, even when the current is likely to flow in a portion close to the power source, even when the inlet portion of a tubular article such as a filler pipe is formed narrowly or a structure is provided at the inlet portion, the inner electrode wire The dissolution of the root portion can be prevented, and the life of the inner surface electrode can be extended.

In the present invention of claim 6, the inner surface electrode wire cover member is an inner surface electrode for inner surface plating of a tubular article having a thickness of 0.5 to 1.5 mm.

In the present invention of claim 6, since the inner surface electrode wire cover member has a thickness of 0.5 to 1.5 mm, it is easy to attach the inner surface electrode wire cover member to the inner surface electrode wire by caulking or the like. The time for the inner surface electrode wire cover member to dissolve in the plating solution can be lengthened, and the life of the inner surface electrode can be lengthened. When the wall thickness is less than 0.5 mm, the time for the inner surface electrode wire cover member to dissolve in the plating solution is shortened, the life of the inner surface electrode wire 11 is shortened, and when the wall thickness exceeds 1.5 mm, It becomes difficult to attach the inner surface electrode wire cover member to the inner surface electrode wire.

In the present invention of claim 7, the tubular article is an inner surface electrode for inner plating of a tubular article formed by bending.

In the present invention of claim 7, since the tubular article is formed by bending, the inner surface electrode wire having flexibility is inserted into the tubular article along the bending of the tubular article, and the entire inner surface of the bent tubular article is formed. It can be plated across.

According to the present invention of claim 8, the tubular article is a filler pipe that supplies fuel to a fuel tank of an automobile, and the inner surface electrode wire cover member is attached so as to be close to the inlet portion of the filler pipe during electroplating. It is an inner surface electrode for inner surface plating.

In the present invention of claim 8, the tubular article is a filler pipe that supplies fuel to a fuel tank of an automobile, and the inner surface electrode wire cover member is attached so as to be close to the inlet portion of the filler pipe during electroplating. . Therefore, the inside of the filler pipe bent three-dimensionally can be reliably plated, and even if the retainer is attached to the inlet portion of the filler pipe and the inlet portion becomes narrow, the inner electrode wire cover member can The lifetime of the electrode can be extended.

The inner surface electrode wire is a portion where the inner surface electrode wire and the plating solution are in contact, and a conductive inner surface electrode wire cover member is attached to the outer surface of the portion where the current flows more than other portions of the inner surface electrode wire. The inner surface electrode wire cover member is dissolved before the inner surface electrode wire, so that the inner surface electrode wire is prevented from being dissolved, the inner surface electrode wire is prevented from being broken, and the life of the inner surface electrode wire can be extended.

It is a conceptual diagram of the plating apparatus used by embodiment of this invention. It is a side view of the plating hanger used in embodiment of this invention. It is sectional drawing of the state which inserted the inner surface electrode used by embodiment of this invention in the tubular article. It is a fragmentary sectional view of an inner surface electrode line in the state where an inner surface electrode line cover member was attached to an inner surface electrode which is an embodiment of the present invention. It is a fragmentary sectional view of an inner surface electrode line in the state where an inner surface electrode line cover member was attached to the inner surface electrode which is an embodiment of the invention, and the inner surface electrode line cover member was melted. It is a perspective view of the conventional inner surface electrode. It is sectional drawing of the state which inserted the conventional inner surface electrode in the tubular article. It is a fragmentary sectional view in the state where the conventional inner surface electrode wire melted.

About embodiment of this invention, the case where zinc plating is carried out to the inner surface of the filler pipe 20 for motor vehicles which is a tubular article is taken as an example, About the inner surface electrode 10 used for the plating, and a plating method, FIGS. This will be explained based on.
In addition to the filler pipe 20, the inner surface electrode 10 of the present invention can be widely used when plating on the inner surface of a tubular article. It can also be used for plating other than zinc plating.

First, the inner surface electrode 10 will be described with reference to FIGS.
As shown in FIG. 3, the inner surface electrode 10 includes an inner surface electrode connection portion 16 connected to an anode plate end portion 37 to be described later, and an inner surface electrode wire 11 connected to the inner surface electrode connection portion 16. The inner surface electrode wire 11 includes an inner surface electrode wire root portion 12 adjacent to the inner surface electrode connection portion 16, an inner surface electrode wire central portion 13 at the center portion of the inner surface electrode wire 11, and an inner end electrode wire tip at the distal end portion of the inner surface electrode wire 11. And an inner surface electrode wire cover member 15 attached to the inner surface electrode wire root portion 12.

The inner electrode wire 11 may be a straight one, but is preferably flexible so that it can be bent flexibly in order to be inserted into a bent tubular article, for example, the filler pipe 20. As what has flexibility, what formed by knitting many metal thin wires can be used.

In the case of the flexible inner surface electrode wire 11, even if the tubular article is bent, the inner surface electrode wire 11 is flexibly deformed along the bend and extends over the entire length of the long tubular article. It can be inserted and plated over the entire length of the inner surface of the tubular article.

In order to prevent the inner surface of the inner surface electrode wire 11 from contacting the inner surface of the inner surface electrode wire 11 and the inner surface electrode wire cover member 15 with the inner surface of the filler pipe 20 and the inner surface electrode wire 11, plating is performed. A member through which the liquid and plating current can flow is attached. As the insulating member, a synthetic resin spacer or mesh member wound around the inner surface electrode wire central portion 13 and the inner surface electrode wire cover member 15 can be used.

Further, when the inner surface electrode wire 11 is formed by knitting a large number of metal wires, when the inner surface electrode wire 11 is inserted into the long filler pipe 20 or the like having a predetermined rigidity, the filler pipe 20 Depending on the shape, it is easy to push along the filler pipe inner surface 21 to the other outlet end. Further, the alkaline property of the plating solution 2 can be durable. Moreover, since it is metal, it has electroconductivity and is excellent in durability.

As shown in FIG. 3, the inner surface electrode wire 11 is a conductive portion on the outer surface of the portion where the inner surface electrode wire 11 and the plating solution 2 are in contact with each other and where the current flows more than the other portions of the inner surface electrode wire 11. An inner surface electrode wire cover member 15 is attached. In the present embodiment, it is attached to the inner surface electrode wire root portion 12.

In the present embodiment, the portion of the inner surface electrode wire 11 where the inner surface electrode wire 11 and the plating solution 2 are in contact, and the portion where the current flows more than the other portion of the inner surface electrode wire 11 is a filler pipe that is a tubular article. 20 is an inner surface electrode wire root portion 12 of the inner surface electrode wire 11 in the vicinity of the entrance portion. A retainer for holding the tip of the fueling gun is attached to the inlet portion of the filler pipe 20 or a screw portion for attaching a tank cap is formed, so that the inlet portion becomes narrower and the inner electrode wire 11 and It is easy to approach.

In such a case, the inner surface electrode wire cover member 15 is attached so as to be close to the inlet portion of the filler pipe 20 at the time of electroplating. Therefore, the inside of the filler pipe 20 bent three-dimensionally can be reliably plated, and even if a retainer or the like is attached to the inlet portion of the filler pipe 20, the inner surface electrode 10 is covered by the inner surface electrode wire cover member 15. The lifetime can be extended.

The inner surface electrode wire cover member 15 is formed in a cylindrical shape and is attached by caulking to the inner surface electrode wire root portion 12.
The inner electrode wire cover member 15 has an inner diameter slightly larger than the outer diameter of the inner electrode wire 11 so that the inner electrode wire cover member 15 can be attached to the inner electrode wire 11, and the inner electrode wire cover member 15 has a length of about 30 to 50 mm. Have.

The wall thickness of the inner surface electrode wire cover member 15 is preferably about 0.5 to 1.5 mm. In this case, the inner surface electrode wire cover member 15 can be easily attached to the inner surface electrode wire 11 by caulking or the like, and the time during which the inner surface electrode wire cover member 15 is dissolved in the plating solution can be lengthened. The lifetime of the electrode 10 can be extended.

When the wall thickness is less than 0.5 mm, the time for the inner surface electrode wire cover member 15 to dissolve in the plating solution is shortened, and the inner surface electrode wire 11 is dissolved as shown in FIG. Is more than 1.5 mm, the rigidity of the inner surface electrode wire cover member 15 becomes too large, and the inner surface electrode wire cover member 15 is hardly caulked to the inner surface electrode wire 11.

The inner surface electrode wire 11 and the inner surface electrode wire cover member 15 are preferably made of stainless steel. In this case, the inner surface electrode wire 11 and the inner surface electrode wire cover member 15 are not easily rusted, hardly corroded by the plating solution and other chemicals, and are excellent in durability.

The inner electrode wire 11 and the inner electrode wire cover member 15 are preferably made of the same material. In particular, it is preferable to use stainless steel 316 (SUS316), both of which are defined in JIS. Stainless steel 316 (SUS316) is particularly excellent in corrosion resistance and durability.
When the inner surface electrode wire 11 and the inner surface electrode wire cover member 15 are formed of the same stainless steel 316 (SUS316), the inner surface electrode wire cover member 15 can be reliably dissolved.

Next, a method for plating a tubular article using the inner surface electrode 10 will be described taking galvanization of the filler pipe 20 as an example.
The plating of the tubular article such as the filler pipe 20 is performed as shown in FIG.
A plating solution 2 is placed in the plating tank 1, and the plating solution 2 contains sodium hydroxide, sodium cyanide and zinc ions. Furthermore, positive electrodes 3 and 4 formed of a zinc plate are inserted into the plating tank 1, and an inner surface electrode 10 is inserted inside a filler pipe 20 that is an object to be plated.
The surface of the filler pipe 20 is cleaned by a degreasing process and a cleaning process before the plating process.

An anode lead wire 5 is attached to the positive electrodes 3 and 4, and an inner surface electrode lead wire 6 is attached to the inner surface electrode 10. A cathode lead wire 7 is attached to the filler pipe 20. The anode lead wire 5 and the inner electrode lead wire 6 are connected to the anode from the power supply for the outer surface which is a plating current supply device, and the cathode lead wire 7 is connected to the cathode of the power supply for the outer surface. Plating is performed.

At this time, many filler pipes 20 are immersed side by side in the plating tank 1 and plating is performed, but the holding of the filler pipe 20 in the plating tank 1 is performed by the plating hanger 30 as shown in FIG.
The filler pipe 20 is attached to the plating hanger 30 and immersed in the plating tank 1. The plating hanger 30 includes a cathode plate 31 that supplies current to the filler pipe 20 and an anode plate 35 that supplies current to the inner surface electrode 10. The cathode plate 31 and the anode plate 35 are insulated from each other near the center and bonded together. Has been.

The top end of the cathode plate 31 is bent into a substantially U-shaped cross section to form a cathode plate engaging portion 32. The cathode plate engaging portion 32 is engaged with the cathode bar 8 provided in the plating tank 1, and the plating hanger 30 and the filler pipe 20 are held in the plating tank 1. Cathode current is supplied to the cathode bar 8 from an external power source and is electrically connected to the cathode plate 31 of the plating hanger 30.

A cathode plate holding portion 33 is formed at the lower end of the cathode plate 31 to hold the filler pipe 20 that is a tubular article. The cathode plate holding unit 33 can hold the filler pipe 20 and supply a cathode current to the filler pipe 20 to electroplate the outer peripheral surface portion and the inner surface (filler pipe inner surface 21) of the filler pipe 20.
The filler pipe 20 may be held by being fitted in and held in a cathode plate holding part 33 formed in a ring shape having an opening, or may be hooked on a breather pipe or the like formed on the outer surface of the filler pipe 20.

At this time, since the inner surface electrode wire cover member 15 is attached to the inner surface electrode wire root portion 12 of the inner surface electrode wire 11 close to the inlet portion of the filler pipe 20, there is a large plating current near the inner surface electrode wire root portion 12. Even if it flows, as shown in FIG. 5, since the inner surface electrode wire cover member 15 is first dissolved, the inner electrode wire 11 can be prevented from being dissolved, and the life of the inner surface electrode 10 can be extended.

In addition, as described above, an insulating member is attached to the inner surface electrode line central portion 13 of the inner surface electrode line 11 and the surface of the inner surface electrode line cover member 15 in order to prevent contact with the inner surface of the filler pipe 20. Yes. For this reason, even if the elongate inner surface electrode wire 11 is inserted into the bent filler pipe 20, plating can be performed without causing a short circuit.

An upper end of the anode plate 35 forms an anode plate connection portion 36, and an anode current is supplied from the inner surface power source via the anode plate connection portion 36. An anode plate end portion 37 is formed at the lower end of the anode plate 35, and the inner surface electrode connection portion 16 formed on the inner surface electrode wire root portion 12 of the inner surface electrode 10 is formed on the anode plate end portion 37. 18 is attached. As a result, an anode current is supplied from the anode plate 35 to the inner surface electrode 10.

At this time, as shown in FIG. 2, the base side of the inner surface electrode auxiliary lead 9 can be attached to the anode plate end portion 37. In this case, the inner electrode auxiliary lead wire 9 can be attached by the inner electrode stopper 18 in the same manner as the inner electrode wire connecting portion 16. The inner electrode auxiliary lead wire 9 is supplied with an anode current from the anode plate 35.

The tip end side of the inner electrode auxiliary lead wire 9 is attached to the inner electrode tip 14, and the inner electrode wire 11 portion of the attached inner electrode 10 serves as the inner electrode tip feed point 17.
Since the inner surface electrode wire tip feeding point 17 is provided at the inner surface electrode wire tip portion 14 of the inner surface electrode wire 11, the inner surface electrode 10 allows current to flow from both sides of the inner surface electrode wire root portion 12 and the inner surface electrode wire tip portion 14. Thus, the current distribution can be made uniform over the entire length of the inner surface electrode wire 11, and the plating thickness distribution on the inner surface of the filler pipe 20 can be made uniform.

DESCRIPTION OF SYMBOLS 1 Plating tank 2 Plating solution 10 Inner surface electrode 11 Inner surface electrode wire 15 Inner surface electrode wire cover member 20 Filler pipe (tubular article)

Claims (8)

When performing electroplating on a tubular article, an inner surface electrode for inner surface plating of a tubular article that is inserted into the tubular article and used for electroplating the inner surface of the tubular article.
The inner surface electrode has an inner surface electrode connecting portion connected to a power source and a long inner electrode wire formed of a conductor. The inner surface electrode wire is a portion where the inner surface electrode wire and the plating solution are in contact with each other. An inner surface electrode for inner surface plating of a tubular article, wherein a conductive inner surface electrode wire cover member is attached to an outer surface of a portion where a current flows more than other portions of the inner surface electrode wire. The inner surface electrode for inner surface plating of a tubular article according to claim 1, wherein the inner surface electrode wire has flexibility and is formed by braiding a number of metal wires. The inner surface electrode for inner surface plating of a tubular article according to claim 1 or 2, wherein the inner surface electrode wire cover member is made of stainless steel. 4. The inner surface electrode for inner surface plating of a tubular article according to claim 1, wherein both the inner surface electrode wire and the inner surface electrode wire cover member are made of stainless steel 316 (SUS316). 5. The portion of the inner surface electrode wire in contact with the plating solution and the portion where the current flows more than the other portion of the inner surface electrode wire is the inner surface electrode wire adjacent to the inlet portion of the tubular article. The inner surface electrode for inner surface plating of the tubular article according to any one of claims 1 to 4, wherein the inner surface electrode is an inner electrode. The inner surface electrode for inner surface plating of a tubular article according to any one of claims 1 to 5, wherein the inner surface electrode wire cover member has a thickness of 0.5 to 1.5 mm. The inner electrode for inner surface plating of the tubular article according to any one of claims 1 to 6, wherein the tubular article is formed to be curved. 8. The tubular article is a filler pipe that supplies fuel to a fuel tank of an automobile, and the inner surface electrode wire cover member is attached so as to be close to an inlet portion of the filler pipe during electroplating. An inner surface electrode for inner surface plating of the tubular article according to any one of the above.

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