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Multilayer plated fuel line parts for automobile

A multi-layer plating, automotive technology, applied in superimposed layer plating, low-pressure fuel injection, fuel injection devices, etc., can solve problems such as damage to the trivalent chromate coating, unsuitable use, broken O-rings, etc.

Inactive Publication Date: 2005-09-21
SANOH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the oil cup with hexavalent chromate coating as the surface protection layer, since the surface of the hexavalent chromate coating is relatively rough, the friction resistance when inserting the fuel injector is relatively large, and sometimes it will be damaged or broken. Ring
[0010] On the other hand, in the case of using a trivalent chromate coating as a substitute for a hexavalent chromate coating, the adhesion of the trivalent chromate coating to the Zn-Ni alloy plating layer is poor, Therefore, there is a disadvantage that the trivalent chromate coating will be damaged when the fuel injector is inserted, so it is not suitable for use in the plating treatment of the fuel supply pipe.

Method used

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  • Multilayer plated fuel line parts for automobile
  • Multilayer plated fuel line parts for automobile
  • Multilayer plated fuel line parts for automobile

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Embodiment Construction

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] figure 1 Indicates an oil supply pipe to which the present invention is applied to perform multilayer plating treatment, figure 2 is a cross-sectional view.

[0026] The main body portion 10 of the oil supply pipe is composed of two casings, an upper casing 10a and a lower casing 10b, which are separately formed by press working a steel plate. After the upper casing 10a is assembled to the lower casing 10b, the Brazing is performed on the overlapped portion to join them together. An oil cup 12 for installing the oil injector 11 is installed on the lower surface of the lower housing 10b. 14 is a bracket for fixing.

[0027] The surface of the oil supply pipe is covered by 3 layers of plating layers, and the 3 layers of plating layers include: the Zn-Ni alloy plating film 16 on the bottom layer of the covering surface, the Zn coating film 18 on the top layer...

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Abstract

A trivalent chromate coating having improved surface smoothness is used as an alternative to a hexavalent chromate coating serving as a protective coating. A piping member of a steel for an automotive fuel line is coated with a multilayer coating consisting of a plated Zn-Ni alloy film as a bottom layer, a plated Zn film as an intermediate layer overlying the plated Zn-Ni alloy layer, and a trivalent chromate layer as a top layer overlying the plated Zn film.

Description

technical field [0001] The present invention relates to automobile fuel piping parts such as fuel supply pipes which have been subjected to chromate gloss treatment and whose surface is covered by multilayer plating. Background technique [0002] Plated coatings are formed on the surface of parts such as metal pipes that make up fuel piping in automobiles, and are used to enhance mechanical properties such as corrosion resistance, chemical resistance, and wear resistance that are not sufficient for the materials of the parts themselves according to their applications. [0003] For example, in fuel supply pipes for distributing fuel sent through fuel supply pipes to fuel injectors, Zn—Ni alloy-based plating is mainly performed for the purpose of corrosion prevention. Conventionally, a widely used method is to form a Zn—Ni alloy plating film on the surface of a steel sheet, and coat the hexavalent chromate film as a surface protective layer thereon. Oxidation of zinc tends to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00C23C22/53C23C28/00C25D5/10C25D5/26C25D5/48C25D7/00C25D7/04F02M55/02F02M61/16
CPCC23C28/3455C25D5/48C23C28/345F02M69/465C23C28/322C23C28/321C23C2222/10C25D5/10F02M61/166C25D5/12
Inventor 松原德文
Owner SANOH IND CO LTD
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