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Method for preparing metal substrate with multi-layer film, metal substrate with multi-layer film obtained thereby and coated product

A technology for metal substrates and multilayer films, applied in metal material coating processes, coatings, devices for coating liquids on the surface, etc., can solve the problems of exposed corrosion resistance, insufficient adhesion, corrosion resistance, and insufficient Corrosion resistance etc.

Inactive Publication Date: 2009-07-22
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in these patent publications, the film is formed without applying current, and this film has insufficient corrosion resistance
[0011] Therefore, the methods of these patent publications do not achieve sufficient adhesion, corrosion resistance, and especially long-term corrosion resistance such as exposure corrosion resistance, etc.

Method used

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  • Method for preparing metal substrate with multi-layer film, metal substrate with multi-layer film obtained thereby and coated product
  • Method for preparing metal substrate with multi-layer film, metal substrate with multi-layer film obtained thereby and coated product
  • Method for preparing metal substrate with multi-layer film, metal substrate with multi-layer film obtained thereby and coated product

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0085] Preparation Example 1 (preparation of bismuth compound aqueous solution No.1)

[0086] 2,997 parts of 10% acetic acid were added to 3 parts of bismuth nitrate, and sufficiently stirred to obtain bismuth compound aqueous solution No. 1 with a solid content of 0.1%. The pH value of the bath solution of bismuth compound aqueous solution No. 1 was 3.0.

preparation Embodiment 2

[0087] Preparation Example 2 (preparation of bismuth compound aqueous solution No.2)

[0088] 2,997 parts of 10% acetic acid were added to 3 parts of bismuth lactate, and stirred well to obtain bismuth compound aqueous solution No. 2 with a solid content of 0.1%. The pH value of the bath liquid of bismuth compound aqueous solution No. 2 is 3.1.

preparation Embodiment 3

[0089] Preparation Example 3 (preparation of bismuth compound aqueous solution No.3)

[0090] 2,970 parts of deionized water were added to 30 parts (3 parts of solid) of a 10% aqueous solution of bismuth methoxyacetate, and sufficiently stirred to obtain aqueous solution No. 3 of a bismuth compound having a solid content of 0.1%. The pH value of the bath solution of bismuth compound aqueous solution No. 3 was 4.0.

[0091] Preparation of chemical conversion solution

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Abstract

The invention relates to a process for producing a metal substrate with a multilayer film, the metal substrate with the multiplayer film obtained from the method, and a coating product. The present invention provides the process for producing the metal substrate with the multilayer film that has excellent corrosion resistance, specifically, the process comprising immersing a metal substrate in an aqueous bismuth compound solution (A) and applying an electric current between the metal substrate and an electrode to thereby form a coating film (F1) on the metal substrate; and then applying a coating composition (B) on the coating film (F1) to form a coating film (F2).

Description

technical field [0001] The invention relates to a method for producing a metal substrate with a multilayer film, to a metal substrate with a multilayer film obtained by the method, and to a coated article. The invention also relates to methods for forming multilayer films. Background technique [0002] Heretofore it is known that the surface of industrial metal substrates is treated by cathodic electrolysis or with metal phosphates, metal oxides and / or the like as a surface treatment to improve adhesion and corrosion resistance prior to application of coating compositions. [0003] In order to further improve adhesion and corrosion resistance, after surface treatment with metal phosphate, metal oxide and / or the like, the metal substrate is treated with an aqueous solution containing chromic acid (hereinafter sometimes referred to as "post-treatment"). However, such processing involves many environmental issues. [0004] In order to avoid these problems, the following proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D3/10C25D3/54
CPCC25D5/48C23C22/362C23C22/83C25D5/36C25D3/54Y10T428/31678
Inventor 久保田健太郎
Owner KANSAI PAINT CO LTD