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Rust-proof steel sheet and method for producing the same

A manufacturing method and technology of steel plates, applied in the direction of manufacturing tools, chemical instruments and methods, anti-corrosion coatings, etc., can solve the problems of reduced corrosion resistance, pressing defects, inability to weld, etc., and achieve excellent spot weldability and corrosion resistance, electroplating. The effect of omitting the process and reducing the film thickness

Inactive Publication Date: 2011-08-24
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] As described above, when it is desired to perform spot welding on a steel sheet with an organic coating, there is a problem that welding cannot be performed if the organic coating is thick, and sufficient corrosion resistance cannot be obtained if the coating is thin.
If a conductive substance such as a metal is added to the organic coating film in order to achieve welding even if the coating film is thick, the coating film itself will be detached due to processing, causing pressing defects and lowering corrosion resistance

Method used

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  • Rust-proof steel sheet and method for producing the same

Examples

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Embodiment 1

[0036] Examples of the present invention will be described below.

[0037]As the mother plate of the rust-proof steel sheet, a plated steel sheet is used. As a coated steel sheet, the adhesion amount per surface is 40 to 45 g / m 2 There are three kinds of alloyed hot-dip galvanized steel sheet, hot-dip galvanized steel sheet and electro-galvanized steel sheet. For these three types of coated steel sheets, epoxy-based paints were used as organic-based paints, and three roll coaters were used to coat them. First, the coating material picked up by the pick-up roll is adjusted to a desired amount (depending on the thickness to be coated) with a metering roll, and the steel sheet is coated with various coating film thicknesses using an applicator roll according to the coating method. In addition, for the control of the thickness of the organic coating layer located in the spot welding part, the surface processing of making the part corresponding to the painted part into a concave ...

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Abstract

Provided is a rust-proof steel sheet having on at least one side an organic and / or inorganic coating layer, wherein the coating layer of the portion to be spot welded is thinner than the coating layer of the portion not to be spot welded. Also provided is a method for producing the rust-proof steel sheet. The rust-proof steel sheet has sufficiently low electrical resistivity at the welded parts that sound welded parts can be formed, and has both spot weldability and corrosion resistance.

Description

technical field [0001] The present invention relates to a rust-proof steel sheet having an organic-based and / or inorganic-based coating layer excellent in spot weldability. Background technique [0002] The rust resistance of automobiles is gradually becoming a very important required characteristic. As far back as the 1970s, snowmelting agents (salts) were used for the purpose of preventing road surfaces from freezing, and the problem of automobile corrosion was greatly exacerbated. Furthermore, in recent years, the lifespan of automobiles has become longer, and the time required to suppress rust has also become longer. [0003] Due to the above-mentioned circumstances, various kinds of rust-proof steel sheets are being developed. At present, methods for improving corrosion resistance are roughly divided into a method of applying zinc-based plating to a steel sheet and a method of covering the surface of the steel sheet with an organic-based coating. [0004] In the auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/04B32B3/30C23F11/00B23K11/16B23K103/04
CPCB05D7/14B23K11/34B23K2201/34C09D5/08B23K2201/006B23K2201/18B23K31/12C23C30/00B05D2701/40B23K11/11B23K11/163B23K2101/006B23K2101/18B23K2101/34Y10T428/24917Y10T428/24612B32B15/04B32B3/30C23F11/00B23K11/16
Inventor 杉本芳春藤田荣
Owner JFE STEEL CORP
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