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spring parts

A spring component and body technology, applied in the field of spring components, can solve the problems of corrosive substances intruding into cracks, reducing corrosion resistance, and easy expansion of the coating film, so as to reduce the number of processes, improve fatigue resistance, and improve corrosion resistance. Effect

Active Publication Date: 2019-11-08
CHUO SPRING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Such coatings based on coatings containing high concentrations of zinc powder sometimes cause cracks due to pores generated during coating, causing corrosive substances to penetrate into the cracks and reduce the protective function of the coating.
[0006] In particular, since the spring member is repeatedly elastically deformed, cracks formed on the coating film tend to spread over time
In addition, when it is used as a suspension spring of a vehicle, etc., the cracks generated on the coating film are also easy to spread due to the collision of gravel and gravel bouncing up in the wheel with the surface of the suspension spring.
[0007] Once the cracks formed on the coating film spread, corrosive substances are more likely to penetrate, and the corrosion resistance is greatly reduced

Method used

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Embodiment

[0103] Next, the present invention will be described in more detail with examples and comparative examples, but the present invention is not limited to these examples. It should be noted that, unless otherwise specified, the formulation amounts of the powder coating compositions in the table represent parts by mass.

[0104] The prepared powder coating composition shown in Table 1 was produced by the aforementioned production method, and a gasket was used as the object to be coated (outer diameter 40mm, inner diameter 21mm, thickness 2.9mm, made of carbon steel (S45C)), and the coating film Test pieces of Examples 1 and 2 were prepared by electrostatically coating one side of the gasket to a thickness of 50 μm, and baking at 170° C. for 20 minutes (post-heating). Further, except that the heating condition was set to preheating, the same operation as in Example 1 was carried out to prepare a test piece of Example 3. In the preheating, the test piece was heated in advance so th...

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Abstract

The present invention pertains to an easily producible spring member for improving prescribed properties. A spring plate 1 is equipped with a spring body 10 and a film coating 11. The spring body 10 comprises a ferrous material such as spring steel, and the center section thereof is curved. The film coating 11 is formed on the spring body 10 top surface 10a on which a tensile force acts. The film coating 11 is formed from a powdered coating composition containing an epoxy resin, an acid-terminated polyester resin, and a zinc powder. Thus, a zinc-containing layer containing a relatively large amount of zinc powder is formed on the surface side of the spring body 10, and a resin-containing layer containing a relatively large amount of a resin component is formed on the zinc-containing layer.

Description

technical field [0001] The present invention relates to a spring member having a corrosion-resistant coating film formed on its surface. Background technique [0002] Spring parts made of metal materials may undergo characteristic changes and strength deterioration due to corrosion by the environment in which they are used. In order to prevent such corrosion, a protective film such as a coating by plating or a coating by paint is provided on the surface of the metal member. [0003] Corrosion occurs when metal atoms on the surface of a metal part are ionized and stripped from the part surface. When there is a metal (active metal (base metal)) with a greater ionization tendency than the metal constituting the part on the surface of the metal part, the low-potential metal with a greater ionization tendency in a corrosive environment is more likely than the metal constituting the metal part (inactive metal) Metals (noble metals)) are ionized first, and corrosion of metal part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F1/12B32B27/18B32B27/36B32B27/38C09D5/03C09D163/00C09D167/00C23C26/00F16F1/02F16F1/18F16F1/20
CPCB32B27/18B32B27/36B32B27/38C09D5/03C09D163/00C09D167/00C23C26/00F16F1/02F16F1/12F16F1/18F16F1/20
Inventor 冈本贵幸国田靖彦大塚翔太开作昌泰
Owner CHUO SPRING