Metal surface treatment liquid for cation electrodeposition coating

a technology of metal surface treatment and cation electrodeposition, which is applied in the direction of electrolytic coating, metal material coating process, coating, etc., can solve the problems of insufficient cold-rolled steel plate throwing power, no significant effect in terms of throwing power, and insufficient throwing power. , to achieve the effect of improving the present invention, and avoiding the formation of sludg

Inactive Publication Date: 2008-09-25
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0026]It is believed that the throwing power attained by the metal surface treatment liquid for cation electrodeposition coating of the present invention can be improved by including tin ions in addition to zirconium ions when the cation electrodeposition coating is carried out after forming a conversion coating film with this treatment liquid. Although not clarified, the grounds are conceived as follows.
[0027]When zirconium ions are used alone, formation of their oxide coating film is believed to be executed simultaneously with etching of the metal base material in an acidic medium. However, since segregation materials and the like of compounds containing silicon or carbon in addition to silica may be present on cold-rolled steel plates, such parts are not susceptible to etching. Therefore, the coating film cannot be uniformly formed with zirconium oxide, whereby portions without coating film formation can be present. Since a difference in electric current flow is believed to be generated between the parts with and without formation of the coating film, the electrodeposition is not uniformly executed, and consequently, the throwing power cannot be sufficiently attained.
[0028]When tin ions are additionally present, it is further considered as in the following. Since the tin ions are less likely to be affected on the steel plate as compared with the zirconium ions, their oxide coating film can be more easily formed on the base mater...

Problems solved by technology

However, this zinc phosphate treatment has a problem of sludge generation as a by-product.
However, it has been recently proven that when a metal base material which had been surface treated with the zirconium ions is subjected to the cation electrodeposition coating, there may be a case in which no significa...

Method used

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  • Metal surface treatment liquid for cation electrodeposition coating

Examples

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Comparison scheme
Effect test

production example 1

Production of Hydrolysis Condensate of Aminosilane, Part 1

[0089]As aminosilane, 5 parts by mass of KBE603 (3-aminopropyl-triethoxysilane, effective concentration: 100%, manufactured by Shin-Etsu Chemical Co., Ltd.) was added dropwise using a dropping funnel to a mixed solvent (solvent temperature: 25° C.) containing 47.5 parts by mass of deionized water and 47.5 parts by mass of isopropyl alcohol over 60 minutes to a homogenous state, followed by allowing for reaction under a nitrogen atmosphere at 25° C. for 24 hours. Then, the reaction solution was subjected to a reduced pressure to allow for evaporation of isopropyl alcohol, and deionized water was further added thereto, whereby a hydrolysis condensate of aminosilane including 5% of the active ingredient was obtained.

production example 2

Production of Hydrolysis Condensate of Aminosilane, Part 2

[0090]In a similar manner to Production Example 1, except that the amounts were changed to 20 parts by mass of KBE603, 40 parts by mass of deionized water, and 40 parts by mass of isopropyl alcohol, a hydrolysis condensate of aminosilane including 20% of the active ingredient was obtained.

example 1

[0091]A metal surface treatment liquid for cation electrodeposition coating was obtained by: mixing a 40% aqueous zircon acid solution as a zirconium ion source, tin sulfate as a tin ion source, and hydrofluoric acid; diluting the mixture so as to give a zirconium ion concentration of 500 ppm, and a tin ion concentration of 30 ppm; and adjusting the pH to 3.5 using nitric acid and sodium hydroxide. Measurement of free fluorine ion concentration using a fluorine ion meter after adjusting the pH of this treatment liquid to 3.0 revealed a value of 5 ppm.

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Abstract

A surface treatment with a zirconium ion that enables sufficient throwing power, and superior anti-corrosion properties to be exhibited when thus surface treated metal base material is subjected to cation electrodeposition coating is provided. A metal surface treatment liquid for cation electrodeposition coating includes zirconium ions and tin ions, and has a pH of 1.5 to 6.5, in which: the concentration of zirconium ions is in the range of 10 to 10,000 ppm; and the content of the tin ions to the zirconium ions is 0.005 to 1 on a mass basis. Furthermore, a polyamine compound, copper ions, fluorine ions, and a chelate compound may also be included.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]The present application is a continuation of PCT application no. PCT / JP2007 / 074536 filed Dec. 20, 2007.TECHNICAL FIELD[0002]The present invention relates to a metal surface treatment liquid, particularly to a metal surface treatment liquid suited for cation electrodeposition coating, and a method of metal surface treatment.BACKGROUND ART[0003]In order to impart anti-corrosion properties to various metal base materials, surface treatments have thus far been performed. Particularly, a zinc phosphate treatment has been generally employed on metal base materials which constitute automobiles. However, this zinc phosphate treatment has a problem of sludge generation as a by-product. Accordingly, a surface treatment without use of zinc phosphate for a next generation has been demanded, and a surface treatment with zirconium ions is one of such treatments (see, for example, Patent Document 1).[0004]Meanwhile, metal base materials which constitu...

Claims

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Application Information

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IPC IPC(8): C25D3/56
CPCC23C22/34C25D13/20C25D13/04C25D3/56C23C2222/20C25D3/60
Inventor INBE, TOSHIOKAMEDA, HIROSHIKOLBERG, THOMAS
Owner NIPPON PAINT CO LTD
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