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Chromium- and fluorine-free chemical conversion treatment solution for metal surfaces, metal surface treatment method, and metal surface coating method

A technology for chemical conversion treatment and metal surface treatment. It is used in devices for coating liquid on surfaces, metal material coating processes, and surface pretreatment. It can solve problems such as inability to remove fluorine components and achieve excellent corrosion resistance.

Active Publication Date: 2012-07-11
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not possible to completely remove fluorine components that have an impact on the environment and the human body from the chemical conversion coating

Method used

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  • Chromium- and fluorine-free chemical conversion treatment solution for metal surfaces, metal surface treatment method, and metal surface coating method
  • Chromium- and fluorine-free chemical conversion treatment solution for metal surfaces, metal surface treatment method, and metal surface coating method
  • Chromium- and fluorine-free chemical conversion treatment solution for metal surfaces, metal surface treatment method, and metal surface coating method

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preparation example Construction

[0063] The method for preparing the chemical conversion treatment liquid of the present invention is not particularly limited, and it is prepared by adding essential components (A), (B) and optional components (C) to (D) to an aqueous solvent in any order. A preferable preparation method is, for example, a method of adding essential components and then optional components in an aqueous solvent, stirring and mixing at room temperature, and adjusting pH after heating.

[0064] The pH of the chemical conversion treatment solution of the present invention is extremely important, and must be controlled within the range of 2.0 to 6.5. If the pH is less than 2.0, the dissolved amount of the metal base material will increase and sludge will increase, which is not preferable. If the pH exceeds 6.5, the ability to remove the oxide film on the surface of the metal base material is poor, and corrosion resistance and coating film adhesion may be reduced, which is not preferable. A more pr...

Embodiment 1

[0099] The following components (A) to (B) were sequentially added to water at the following concentrations, and stirred at room temperature for 20 minutes. Next, the temperature was raised to 45° C., and the pH was adjusted to 4.0 with aqueous ammonia to prepare a chemical conversion treatment solution 1 . Using the chemical conversion treatment solution 1, the surface treatment of the cleaned metal substrate was performed under the surface treatment condition 1 to form a chemical conversion treatment film. Then, the surface of the metal substrate was washed with water or deionized water, but without drying, electrodeposition coating was performed to form a coating film.

[0100] (A): Zirconium sulfate: 0.5mmol / L

[0101] (B): Glycerin: 2.7mmol / L

[0102] (C)(D)(E): None

Embodiment 2

[0104] The following components (A) to (B) were sequentially added to water at the following concentrations, and stirred at room temperature for 20 minutes. Next, the temperature was raised to 50° C., and the pH was adjusted to 3.0 with aqueous ammonia to prepare a chemical conversion treatment liquid 2 . Using the chemical conversion treatment solution 2, the surface treatment of the cleaned metal base material was performed under the surface treatment condition 3 to form a chemical conversion treatment film. Then, the surface of the metal substrate was washed with water or deionized water, but without drying, electrodeposition coating was performed to form a coating film.

[0105] (A): Titanium sulfate: 4.2mmol / L

[0106] (B): Glycerin: 20.9mmol / L

[0107] (C)(D)(E): None

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Abstract

Disclosed are: a chemical conversion treatment solution for metal surfaces, which enables the formation of a chemical conversion coating film having excellent corrosion resistance and excellent adhesion properties on the surfaces of metal base materials in spite of a fact that the solution does not contain chromium and fluorine, and is suitable for treatments on industrial scales; and a metal surface treatment method. Specifically disclosed are: a chemical conversion treatment solution for metal surfaces, which comprises at least one compound (A) selected from a water-soluble titanium compound and a water-soluble zirconium compound and an organic compound (B) that has multiple functional groups and can serve as a stabilizing agent, and which has a pH value of 2.0 to 6.5, wherein the content of the compound (A) is 0.1 to 10 mmol / L, and the content of the organic compound (B) is 2.5- to 10-fold larger than the content of the metal in the compound (A) by mole; and a method for treating the surface of a metal base material or a structure body using the chemical conversion treatment solution for metal surfaces.

Description

technical field [0001] The present invention relates to a metal surface chemical conversion treatment solution and a metal surface treatment method for imparting excellent corrosion resistance and coating film adhesion to the surface of a metal base material, particularly a structure made of the metal base material and metal surface coating methods. The chemical conversion treatment liquid of the present invention is a product that reduces the environmental load, and although it does not contain harmful fluorine and hexavalent chromium, it can also form a coating with excellent corrosion resistance and coating film adhesion on the surface of the metal structure. Chemical conversion treatment coating. Background technique [0002] In order to improve the corrosion resistance and coating adhesion of metal substrates, chemical conversion treatment has been carried out since ancient times. This chemical conversion treatment refers to the formation of chemical conversion on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/43B05D3/10C23C2/06C23C2/28C23C22/12C23C22/34C23C22/36C23C22/50C23C22/53C23C22/56
CPCC23C2222/20C23C22/48C23C22/46C23C22/50C23C22/53C23C22/56C23C22/68
Inventor 儿玉贵裕永岛康彦小林典昭
Owner NIHON PARKERIZING
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