JP2003034877A - Method for producing pipe molding and pipe molding - Google Patents

Abstract

(57) [Problem] To provide a method of manufacturing a pipe molded article which can also be subjected to Ni plating on the surface of a brazing material at a welded portion and does not cause plating cracks or the like. SOLUTION: This is a method for manufacturing a pipe molded product such as a fuel delivery pipe having a pipe-shaped portion, and a step of forming a completed shape to be formed into a pipe molded product by processing and forming a steel material. Dipping the completed shaped body in a Ni plating solution to perform electroless Ni plating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pipe molded product and a pipe molded product, and more particularly to a method for manufacturing a pipe molded product having high corrosion resistance such as a fuel delivery pipe used for automobile parts and a pipe molded product. Regarding things.

[0002]

2. Description of the Related Art Since fuel such as gasoline flows inside a fuel delivery pipe, if the inside is corroded due to oxidation or the like, rust pieces or the like may be conveyed inside the engine, which is not preferable. Therefore, high corrosion resistance is required inside the fuel delivery pipe.

When the fuel delivery pipe is molded using an aluminum material or the like, it is not necessary to plate the inside of the fuel delivery pipe because the aluminum material has strong corrosion resistance against oxidation and the like.

However, when the fuel delivery pipe is made of an iron material, it is necessary to plate the inside of the fuel delivery pipe in order to prevent oxidation and the like. When the fuel delivery pipe is made of iron, it is not easy to uniformly plate the entire inside of the fuel delivery pipe because the complicated recess is formed inside the fuel delivery pipe after it is formed. Absent.

Therefore, conventionally, in the production of fuel delivery pipes, iron plate materials and pipe materials have been Ni-plated in advance, and then bent and welded to form product shapes. And Zn or Zn is formed on the outer surface of the product.
A plating treatment of Ni or the like was performed, and then a chromate treatment was performed. In this case, the inner side surface of the fuel delivery pipe is Ni-plated, and the outer side surface is Ni-plated, plated with Zn or ZnNi, and chromated. Further, in these plating treatments, electrolytic Ni plating treatments were performed without being subjected to electroless Ni plating treatments.

[0006]

In the past, since a Ni-plated iron plate or pipe material was previously cut and processed, there was a problem that the cut surface was not plated with Ni.

There is a problem that the surface of the brazing material used during welding is not plated with Ni. When the Ni plating was thick, the bending sometimes caused plating cracks. Therefore, there is a problem that gasoline may directly come into contact with the steel material on the inner side surface and the Ni layer, which is the barrier layer, is discontinued on the outer side surface, resulting in deterioration of corrosion resistance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art and to provide a method for producing a pipe molded product which enables production of a tubular product such as a highly corrosion resistant fuel delivery pipe.

[0009]

In order to achieve the above object, the present invention is a method for producing a pipe molded product having a pipe-shaped portion, which is a pipe molded product obtained by processing and molding a steel material. The method is characterized by comprising a step of forming a completed shaped body to be formed, and a step of applying the completed shaped body to a Ni plating solution and performing electroless Ni plating.

In addition, after the step of electroless Ni plating, a step of performing Zn plating or Zn-based alloy plating, chromate treatment and organic coating treatment is provided.

A pipe molded product having a pipe-shaped portion, the electroless Ni formed on the surface
Ni plating layer by plating and Z by Zn plating or Zn-based alloy plating formed on this Ni plating layer
An n-plated layer, a chromate-treated layer formed on the Zn-plated layer, and an organic coating layer formed on the chromate-treated layer.

A pipe molded product having a pipe-shaped portion, which is Zn-plated or Z-plated by electroless Ni plating formed on the inner surface and the outer surface.
a Ni plating layer formed by n-based alloy plating, a Zn plating layer formed on the Ni plating layer formed on the outer surface,
A chromate treatment layer formed on the Zn plating layer,
An organic coating layer formed on the chromate layer is provided.

Further, the pipe molded product is a fuel delivery pipe.

In the above invention, the steel material is processed and formed to form the finished shape body, and the finished shape body is electrolessly Ni-plated. Therefore, the surface of the brazing material at the welded portion may be Ni-plated. In addition, since it is not necessary to newly perform bending work, etc., it is possible to eliminate the occurrence of plating cracks. Also, since no electrodes are provided, it is possible to apply it to the inner surface of the pipe-shaped part. Ni plating can be applied.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a fuel delivery pipe 1 as an example of a tubular product. The fuel delivery pipe 1 is provided with a plurality of cylindrical pipe portions 2 and a long and thin connecting pipe 3 that connects the pipe portions 2 to each other to feed and deliver fuel. Fuel is supplied from A side, B
Sent to the side.

In manufacturing the fuel delivery pipe 1, as shown in FIG. 2, first, in ST1, an iron plate material or an iron pipe material is cut and processed according to a known processing and molding method.
It is formed into a predetermined shape, and the formed and formed portions are connected to each other by welding to finish the shape-completed product shape body.

Next, in ST2, the surface treatment of this product shape body is performed. In this surface treatment, a product shape body that has been geometrically completed to become the fuel delivery pipe 1 is placed in a predetermined plating liquid tank, and electroless Ni plating is performed by a known method. The electroless Ni plating is plating performed using a Ni-P alloy, for example. Rotate the product shape in the plating solution tank or stir the plating solution in the plating solution tank,
The Ni plating solution is allowed to flow into the product shape body. In this case, since the Ni plating is electroless plating, it is not necessary to pass a current through the electrodes, and the mechanical relative movement motion is simply applied between the Ni plating liquid and the product shape body to uniformly and uniformly spread the Ni. Can be plated.
Then, Ni plating is applied to both the outer surface and the inner surface of the product shape body.

Next, in ST3, mainly for the purpose of surface-treating the outer surface of the product shape body, after electroless Ni plating, Zn-based alloy plating or Zn plating is further performed to protect the Ni plating layer. To do. Then, as a final surface treatment, a chromate treatment is performed, and further, a surface treatment for forming an organic film on the surface is performed if necessary.

As a result, Ni is formed on the inner surface of the product shape body.
While plating is applied, the outer surface of the product shape body has N
i plating, Zn alloy plating or Zn plating,
Chromate treatment and organic film treatment are performed.

Next, in ST4, post-treatment of surface treatment is performed to obtain the fuel delivery pipe 1 as a finished product.

As described above, according to the present embodiment, the shape-completed product shape body is processed and finished with the steel material, and then the product shape body is subjected to electroless Ni plating. Ni plating can be applied to the surface of the brazing material at the time of welding, and there is no need to perform additional bending or the like, so it is possible to prevent the occurrence of plating cracks even when the Ni plating is thick. It is possible to prevent direct contact of gasoline with the steel material on the inner side, and it is possible to avoid deterioration of the corrosion resistance of the outer surface due to the interruption of the Ni layer as the barrier layer. it can.

Since the Ni plating is electroless plating, a mechanical relative movement motion is performed between the Ni plating solution and the product shape body without disposing an electrode.
The inner surface of the product shape body can be uniformly plated with Ni.

In addition to electroless Ni plating, Zn alloy plating or Zn plating, chromate treatment,
By applying the organic film treatment, the corrosion resistance to the external environment can be further enhanced. As shown in FIG.
The pipe molded product is a Ni plating layer 11 formed by electroless Ni plating on the outer surface and the inner surface of the steel material 10.
A Zn plating layer 12 formed on the Ni plating layer 11 by Zn plating or a Zn-based alloy plating; and a chromate treatment layer 1 formed on the Zn plating layer 12.
3 and an organic film treatment layer 14 formed on the chromate treatment layer 13.

Further, in addition to the electroless Ni plating, the Zn-based alloy plating or the Zn plating, the chromate treatment, and the organic coating treatment are applied only to the outer surface of the product shape body, so that the outer surface is corrosion-resistant. The efficiency can be enhanced efficiently. In this case, the pipe molded product has a Ni plating layer 1 formed by electroless Ni plating on the inner surface of the steel material 10.
1, a Ni plating layer 11 formed by electroless Ni plating on the outer surface of the steel material 10, a Zn plating layer 12 formed by Zn plating or a Zn-based alloy plating formed on this Ni plating layer 11, and this Zn plating Chromate-treated layer 13 formed on layer 12 and this chromate-treated layer 1
3 and the organic film treatment layer 14 formed on the upper surface.

In the above description, the fuel delivery pipe 1 is taken as an example of the highly corrosion resistant pipe molded product, but the highly corrosion resistant pipe molded product is not limited to this, and a hollow is formed inside. Anything can be used.

Further, the iron and steel material may be iron or an alloy of iron and another metal as long as it is an iron material which is corroded when it comes into direct contact with gasoline or the like.

The Zn plating may be a Zn alloy or Zn metal plating.

[0029]

As described above, according to the constitution of the present invention,
Since the steel material is processed and formed to form a completed shape body and the completed shape body is plated with electroless Ni, it is possible to manufacture a pipe molded article having high corrosion resistance. In addition, electroless Ni
By forming a Zn plating layer, a chromate treatment layer, and an organic coating treatment layer on the plated Ni plating layer, a pipe molded article having high corrosion resistance can be supplied.

[Brief description of drawings]

FIG. 1 is a perspective view showing a fuel delivery pipe, which is an example of a pipe molded product.

FIG. 2 is a diagram showing a manufacturing process of a pipe molded product.

FIG. 3 is a cross-sectional view showing the surface of a pipe molded product.

[Explanation of symbols]

1 Fuel delivery pipe 2 pipe sections 3 connecting pipe

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 55/02 B60K 15/02 C F term (reference) 3D038 CA06 CB01 CC17 3G066 AA01 AB02 AD05 BA50 BA53 BA54 CB01 CC66 CD15 CD21 4K022 AA02 AA41 BA14 BA25 BA32 BA36 4K044 AA02 AB03 BA06 BA10 BA15 BA21 BB05 BC02 CA15 CA16

Claims (6)

[Claims] 1. A method of manufacturing a pipe molded product having a pipe-shaped portion, the process comprising forming a finished product to be a pipe molded product by processing a steel material and forming the finished product. And a step of applying electroless Ni to a Ni plating solution to produce a pipe molded product. 2. Next to the step of electroless Ni plating, Z
The method for producing a pipe molded product according to claim 1, further comprising a step of performing n-plating or Zn-based alloy plating, chromate treatment, and organic coating treatment. 3. The method for producing a pipe molded product according to claim 1, wherein the pipe molded product is a fuel delivery pipe. 4. A pipe molded article having a pipe-shaped portion, comprising a Ni plating layer formed by electroless Ni plating on the surface, and a Zn plating or Zn formed on the Ni plating layer. Zn plated layer by system alloy plating, and this Zn
A pipe molded article comprising a chromate treatment layer formed on a plating layer and an organic coating treatment layer formed on the chromate treatment layer. 5. A pipe molded product having a pipe-shaped portion, wherein a Ni plating layer formed by electroless Ni plating on the inner surface and the outer surface and Ni formed on the outer surface.
A Zn plating layer formed on the plating layer by Zn plating or a Zn-based alloy plating, a chromate treatment layer formed on the Zn plating layer, and an organic coating treatment layer formed on the chromate treatment layer. A pipe molded product characterized by the above. 6. The pipe molded product according to claim 4, wherein the pipe molded product is a fuel delivery pipe.