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Metal surface processing composition

A technology of metal surface treatment and composition, which is applied in the field of surface treatment of galvanized steel sheets, can solve problems such as poor rust resistance, and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2003-02-12
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, phosphating treatment usually carries out surface treatment of zinc phosphate and iron phosphate, and after phosphate treatment for corrosion resistance, rinsing treatment with chromic acid is usually carried out, so there is a problem of chromium treatment, and there are also problems. Wastewater treatment problems such as reaction accelerators and metal ions in phosphate treatment agents, sludge treatment caused by metal ions eluted from the treated metal, etc.
[0004] As surface treatment other than chromate and phosphate treatment, for example, sodium nitrite, sodium borate, imidazole, aromatic carboxylic acid, surfactant, etc. can be used alone or in combination for cold-rolled steel sheet or galvanized steel sheet, but Either one has a certain anti-rust effect in cold water or the atmosphere, and the anti-rust property is poor when exposed to high temperature and humidity environment, especially in the case of galvanized steel sheet treatment, its anti-rust property is very poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0052] Put 320 g of Adeka Bontaita-HUX-232 (manufactured by Asahi Denka Co., Ltd., carboxyl group-containing polyurethane resin, acid value 10 to 15) with a solid content of 20% diluted with deionized water into a flask, and slowly add it dropwise while stirring Snow-Tex N (manufactured by Nissan Chemical Industry Co., Ltd., silica particles, solid content 20%) 80 g, then 1 g of vinyl tris (β-methoxyethoxy) silane was added dropwise, mixed, and reacted at 80 ° C for 2 hours , to obtain an organic composite silicate with a solid content of 20%.

[0053] Preparation of Metal Surface Treatment Compositions

Embodiment 1～21 and comparative example 1～11

[0055] Mix and stir according to the mixing ratio shown in Table 1 below to obtain each metal surface treatment composition. The blends shown in Table 1 are solids weight blends.

[0056] Make test panels

[0057] For plate thickness 0.6mm, electroplating adhesion 20g / m 2 The electro-galvanized steel sheet is sprayed at a liquid temperature of 65°C in the form of an aqueous dispersion with a concentration of 2% using an alkaline degreasing agent [CC-561B] (equivalent to sodium silicate No. After degreasing the surface of the galvanized steel sheet for 69 seconds, spray hot water with a liquid temperature of 50°C for 20 seconds for hot water washing. The steel plate after alkali degreasing is coated with the metal surface treatment composition prepared by the above-mentioned examples and comparative examples, reaching a dry coating weight of 0.8~1g / m 2 , dried at an ambient temperature of 290° C. for 10 seconds (the highest temperature reached by the steel plate was 110° C...

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PUM

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Abstract

The present invention provides a metal surface treating composition. The metal surface treating composition contains (B) 1 to 100 pts.wt. silica particles, (C) 1 to 100 pts.wt. aziridinyl group- or oxazoline group- containing compound, (D) 0.5 to 30 pts.wt. vanadic acid compound and (E) 0.5 to 30 pts.wt. zirconium compound per (A) 100 pts.wt. carboxyl group- containing urethane resin of a resin acid value 5 to 50. The surface treating composition of a pollution-free type has the rust preventive power equivalent to that of chromate treatment and phosphate treatment. The present invention provides the armor plate which by the metal surface treating composition treating also.

Description

technical field [0001] The present invention relates to a pollution-free metal surface treatment composition, which can replace the previous chromate treatment and phosphate treatment, and obtain a coating excellent in processability, corrosion resistance, top coat coating property and the like. It also relates to a surface-treated galvanized steel sheet coated with the metal surface treatment composition and used in the fields of home appliances, building materials, automobiles, and the like. Background technique [0002] In the past, in order to improve the corrosion resistance of metal surfaces, chromate treatment and phosphate treatment were generally carried out. However, in recent years, the toxicity of chromium is becoming a social problem. The surface treatment method using chromate has the problem of dispersion of chromate fumes in the treatment process, the large cost of waste water treatment equipment, and the problems caused by the dissolution of chromic acid fr...

Claims

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Application Information

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IPC IPC(8): C23C22/40B05D7/14C09D175/04C23C22/44C23C28/00
CPCC23C22/74C23C28/00C23C2222/20C23C22/44
Inventor 村田正博中野多佳士
Owner KANSAI PAINT CO LTD
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