Heat and corrosion resistant steel pipe having multi-layered coating

Inactive Publication Date: 2001-10-18
USUI KOKUSAI SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, working conditions are severe, for example, in braking or fuel pipeways of automobiles and there have been demands for heat resistance under high temperature circumstance such as at the periphery of engines, resistance to external mechanical forces such as scratch resistance and impact shock resistance in underfloor pipeways that easily suffer from external injuries as well as higher corrosion resistance.
However, in the protection layer formed by the above-mentioned method, it is necessary to increase the Zn-plating layer as greater than 25 um in order to improve the corrosion resistance of the metal plating layer, which brings about a problem that the productivity is remarkably worsened Further, for attaining a tight bonding

Method used

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  • Heat and corrosion resistant steel pipe having multi-layered coating
  • Heat and corrosion resistant steel pipe having multi-layered coating

Examples

Experimental program
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Effect test

example 1

[0019] (1) Steel Pipe a

[0020] A double-wound steel pipe with having 8 mm outer diameter, 0.7 mm wall thickness and 330 mm length was prepared by using a hoop sheet made of SPCC and having copper plating layer of 3 um thickness on both surfaces.

[0021] (2) Formation of Zn--Ni Alloy Plating Layer

[0022] An alloy plating layer of 8 um thickness was formed by using a Zn--Ni alloy plating bath comprising a chloride bath (Zn-10MU, manufactured by Ebara-Udylite Co., Ltd.).

[0023] (3) Formation of Resin Layer

[0024] The steel pipe a formed with the Zn--Ni alloy plating layer obtained in (2) above was immersed in a paint prepared from an epoxy resin and a pigment dissolved in a solvent to apply resin coating and then heat-treated at 350.degree. C. for 60 sec to form an intermediate layer of an epoxy resin of about 5 um thickness. Then, it was immersed in a solution comprising polyvinyl fluoride coating dispersed in diethyl phthalate to apply polyvinyl fluoride and then heat-dried at 250.degree. ...

example 2

[0029] (1) Steel Pipe b

[0030] Electro-welded pipe made of STPG 38, with 8 mm outer diameter, 0.7 mm wall thickness and 330 mm length.

[0031] (2) Zn--Ni alloy plating Layer and the resin layer were formed in the same procedures as those in Example 1 and various tests were applied in the same manner as in Example 1. The results are shown in Table 1.

example 3

[0032] Formation of Zn--Ni alloy plating layer and chromate treatment.

[0033] After forming a Zn--Ni alloy plating layer by using a steel pipe a in the same manner as in Example 1, a chromate layer was formed by dipping in a chromate processing solution (Zn-80YMU, manufactured by Ebara-Udylite Co., Ltd.) at a solution temperature of 50.degree. C. for 20 sec.

[0034] (2) Subsequently the resin film was formed in the same procedures as in Example 1 and various tests were conducted in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

A heat and corrosion resistant steel pipe having multi-layered coating comprising a steel pipe, a Zn-Ni alloy plating layer deposited to the outer surface of the steel pipe and a polyvinyl fluoride layer formed on the Zn-Ni alloy plating layer with an epoxy resin being intervened therebetween as an intermediate layer. A metal plating layer comprising Zn-Ni plating layer and Ni-plating layer may be used instead of the Zn-Ni plating layer. A chromate layer may be formed on the metal plating layer.

Description

[0001] 1. Field of the Invention[0002] The present invention concerns a pipe of relatively small outer diameter such as less than about 20 mm disposed as a fluid transportation pathway to automobiles or like outer various machineries and, more in particular, it relates to a heat and corrosion resistant steel pipe having multi-layered coating with a protection layer capable of withstanding severe corrosive circumstance.[0003] 2. Description of the Prior Art[0004] As pipeways used for automobiles or other machineries, those products having Zn-plating layer formed to the outer surface of a steel pipe and applied with chromate treatment to the Zn-plating layer have generally been used.[0005] However, working conditions are severe, for example, in braking or fuel pipeways of automobiles and there have been demands for heat resistance under high temperature circumstance such as at the periphery of engines, resistance to external mechanical forces such as scratch resistance and impact shoc...

Claims

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Application Information

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IPC IPC(8): B32B15/01F16L58/08
CPCB32B15/013Y10T428/12549F16L58/08C23C4/04F16L58/04
Inventor TAKAHASHI, TERUHISATAKAHATA, SEIYAUSUI, MASAYOSHI
Owner USUI KOKUSAI SANGYO KAISHA LTD
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