Coated stainless steel member

a technology of stainless steel and coating, applied in the direction of electrophoretic coating, superimposed coating process, transportation and packaging, etc., can solve the problems of insufficient corrosion resistance at the welded portion, insufficient coating adhesion, and inconvenient method of obtaining sufficient coating adhesion, etc., to achieve sufficient coating adhesion and corrosion resistance

Inactive Publication Date: 2013-12-12
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]An object of the present invention is to provide a coating method capable of performing coating excellent in adhesion and corrosion resistance on a stainless steel substrate by an economical and simple process. The coating method makes it possible to obtain sufficient coating adhesion and sufficient corrosion resistance even with a thin film coating of 25 to 30 μm, for example. Another object of the present invention is to provide a coated stainless steel member being chromium-free and having high corrosion resistance, and in particular, a coated stainless steel FIP.
[0008]The present inventors have conducted earnest study to achieve the above objects. As a result, the present inventors have found the following fact. Specifically, by performing Wood's strike nickel plating excellent in adhesion to stainless steel on a stainless steel member, a hard oxide film formed on the stainless steel can be removed, and reformation of the oxide film can be prevented. Subsequently, cationic electrodeposition is performed on such a Wood's strike nickel plating film. In this manner, extremely excellent adhesion between the cationic electrodeposition and the Wood's strike nickel plating can be achieved without forming any film for improving coating film adhesion, and sufficient coating adhesion and corrosion resistance can be obtained on a stainless steel substrate by thin film coating. This finding has led to the completion of the present invention. Specifically, the present invention provides a coated stainless steel member comprising: a stainless steel substrate; and a Wood's strike nickel plating layer and a cationic electrodeposition coating layer which are stacked in this order on the stainless steel substrate.
[0010]In a case of coating on stainless steel, the present invention makes it possible to obtain sufficient coating adhesion and corrosion resistance with a thin film coating of 25 to 30 μm.

Problems solved by technology

However, in a case of coating on stainless steel, a surface treatment film such as a zinc phosphate film formed for enhancing the coating adhesion cannot be formed, and hence a sufficient coating adhesion cannot be obtained, because a stable oxide film is formed on a surface of the stainless steel .
However, such a method is not economical.
However, even in the case of stainless steel FIPs, the corrosion resistance is insufficient at welded portions and the like.
However, it is difficult to perform electrodeposition excellent in adhesion and corrosion prevention on a stainless steel substrate, as described above.

Method used

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Examples

Experimental program
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examples

[0019]The present invention will be described in detail below with reference to the following non-limiting Examples and

[0020]Comparative examples. It will be apparent to those skilled in the art that many changes can be made in the embodiments described without departing from the scope of the present invention.

examples 1 to 5

[0021]By using 50 g / L of a degreasing agent HD-37 (manufactured by DIPSOL CHEMICALS Co., Ltd.), an SUS436 panel (50 mm×100 mm×0.3 mm in thickness) is subjected to cathode electrolysis degreasing under conditions of 50° C., 10 minutes, and a cathode current density of 1 A / dm2. Subsequently, the panel was washed with water. After that, Wood's strike nickel plating was performed (40° C.) under plating conditions shown in Table 1 by using a bath having the following composition.

Nickel chloride (NiCl2)220 g / L35% hydrochloric acid (HCl)230 ml / LBoric acid (H3BO3) 30 g / LDS-55 (manufactured by DIPSOL CHEMICALS Co., Ltd.) 1 ml / L

[0022]After that, the panel was washed with water, and subjected to cationic electrodeposition (25 to 30 μm) in a usual manner, by using an electrodeposition paint CFA 590-034 manufactured by PPG. After washed with water, the panel was baked and dried at 200° C. for 25 minutes. The obtained coated panel was immersed in 5% aqueous sodium chloride at 55° C. for 240 hours...

example 6

[0023]By using 50 g / L of a degreasing agent HD-37 (manufactured by DIPSOL CHEMICALS Co., Ltd.), an SUS436 panel (50 mm×100 mm×0.3 mm in thickness) was subjected to cathode electrolysis degreasing under conditions of 50° C., 10 minutes, and a cathode current density of 1 A / dm2. Subsequently, the panel was washed with water. After that, Wood's strike nickel plating was performed (40° C.) under plating conditions shown in Table 2 by using a bath having the following composition.

Nickel chloride (NiCl2)220 g / L35% hydrochloric acid (HCl)230 ml / LBoric acid (H3BO3) 30 g / LDS-55 (manufactured by DIPSOL CHEMICALS Co., Ltd.) 1 ml / L

[0024]After that, the panel was washed with water, and subjected to cationic electrodeposition (25 to 30 pm) in a usual manner, by using an electrodeposition paint CFA 590-034 manufactured by PPG. After being washed with water, the panel was baked and dried at 200° C. for 25 minutes. The obtained coated panel was immersed in 5% aqueous sodium chloride at 55° C. for 24...

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Abstract

The present invention provides a method for producing a coated stainless steel member, comprising: performing Wood's strike nickel plating on a stainless steel substrate, and then performing cationic electrodeposition on a formed Wood's strike nickel plating layer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a coated stainless steel member, and more specifically a stainless steel member having a coating excellent in adhesion and corrosion prevention. In particular, the present invention relates to a stainless steel fuel inlet pipe (FIP) for an automobile fuel tank.[0003]2. Brief Description of the Related Art[0004]In one kind of the conventionally known methods for coating a stainless steel member, strike nickel plating is performed on a stainless steel substrate. For example, several methods are known such as a method including Wood's strike nickel plating, a subsequent chromate treatment and phosphate treatment, and spray coating (Japanese Patent Application Publication No. Sho 63-192877); a method including strike nickel plating, subsequent nickel plating, and coating (Japanese Patent Application Publication No. Hei 9-268398 and Japanese Patent Application Publication No. 2005-144895), an...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60K15/01C25D7/04F16L9/147C23C28/00
CPCB60K15/01C23C28/00C25D7/04F16L9/147B60K2015/047C23C28/322C23C28/345F16L58/08F16L9/02C25D3/12C25D13/14B60K15/04C09D5/44C25D5/36C25D5/48C25D13/20C25D13/22
Inventor KANETA, MITSUTADAARAI, YASUHIROINOUE, MANABUMIYADERA, TSUTOMU
Owner HONDA MOTOR CO LTD
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