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Corrosion prevention method for aluminum-based metal component, and corrosion-proof aluminum-based metal product produced by the method

A technology for anti-corrosion products and metals, applied in the direction of metal layered products, chemical instruments and methods, metal material coating technology, etc., can solve problems such as adverse effects, and achieve good formative effects

Inactive Publication Date: 2007-09-26
SUMITOMO RIKO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment agent used in this chromate treatment contains hexavalent chromium, which has adverse effects on the human body and the environment, which has become a problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] [Aluminum series metal products]

[0035] A plate (25 mm×60 mm×3 mm (thickness)) made of aluminum alloy A 6063 was prepared.

[0036] [treatment agent]

[0037] Mix 35.0 g of an aqueous solution containing 15% by weight of zinc sulfate heptahydrate, 15.0 g of an aqueous solution containing 10% by weight of ammonium fluoride, and 10.0 g of an aqueous solution containing 5% by weight of sodium molybdate dihydrate, and dilute the obtained mixed liquid Zinc sulfate heptahydrate 5.25g / l, ammonium fluoride 1.5g / l, sodium molybdate 0.5g / l to prepare a treatment agent for chemical film formation.

[0038] (chemical film formation)

[0039] By setting the above-mentioned treatment agent at 75° C. and immersing the above-mentioned aluminum-based metal article in the treatment agent for 20 minutes, a chemical film is formed on the surface of the aluminum-based metal article. Then, it is taken out from the treating agent, washed with water, washed with hot water and dried in seq...

Embodiment 2

[0041] [treatment agent]

[0042]52.5 g of an aqueous solution containing 15% by weight of zinc sulfate 7 hydrate, 22.5 g of an aqueous solution containing 10% by weight of ammonium fluoride, and 15.0 g of an aqueous solution containing 5% by weight of sodium molybdate 2 hydrate were mixed, and the obtained mixture was diluted to obtain Zinc sulfate heptahydrate 7.875g / l, ammonium fluoride 2.25g / l, sodium molybdate 0.75g / l, prepared the treatment agent for chemical film formation.

[0043] [Chemical film formation]

[0044] By setting the treatment agent at 65° C., the aluminum-based metal article was immersed in the treatment agent for 10 minutes to form a chemical film on the surface of the aluminum-based metal article. Then, it was taken out from the treatment agent, washed with water, washed with hot water, and dried in sequence, thereby producing an aluminum-based metal anti-corrosion product.

Embodiment 3

[0046] [treatment agent]

[0047] 70.0 g of an aqueous solution containing 15% by weight of zinc sulfate 7 hydrate, 30.0 g of an aqueous solution containing 10% by weight of ammonium fluoride, and 20.0 g of an aqueous solution containing 5% by weight of sodium molybdate 2 hydrate were mixed, and the obtained mixed solution was diluted to Zinc sulfate heptahydrate 10.5g / l, ammonium fluoride 3.0g / l, sodium molybdate 1.0g / l, prepared the treatment agent for chemical film formation.

[0048] [Chemical film formation]

[0049] By setting the above-mentioned treating agent at 55° C. and immersing the above-mentioned aluminum-based metal article in the treating agent for 5 minutes, a chemical film is formed on the surface of the aluminum-based metal article. Then, it is taken out from the treating agent, washed with water, washed with hot water and dried in sequence. Thus, an aluminum-based metal anti-corrosion product was produced.

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PUM

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Abstract

The present invention provides a corrosion prevention method for an aluminum-based metal component, which makes it easy to check the presence or absence of a chemically formed film on the component, and a corrosion-proof aluminum-based metal product produced by the method. In the method, the following treatment agent (A) is brought into contact with a surface of the aluminum-based metal component to chemically form the following film (B) on the surface of the aluminum-based metal component: (A) a treatment agent comprising an aqueous solution of zinc sulfate, an aqueous solution of ammonium fluoride and an aqueous solution of sodium molybdate which are mixed together; (B) a chemically formed film (B) comprising zinc fluoride, molybdenum and aluminum fluoride.

Description

technical field [0001] The present invention relates to an anticorrosion method for aluminum-based metal products made of aluminum or aluminum alloy and an anti-corrosion aluminum-based metal product prepared by the method. technical background [0002] For example, in the field of automobiles, weight reduction is carried out in order to reduce fuel consumption (enhancement of environmental performance). As a method of reducing weight, metal materials used for suspension arms, propellers, engines, engine mounts, and body panels that make up automobiles are changed from iron to aluminum or aluminum alloys. [0003] Under such circumstances, aluminum and aluminum alloys are initially subjected to chemical treatment (surface treatment) such as chromate treatment to form a chemical film for corrosion protection. The treatment agent used in this chromate treatment contains hexavalent chromium, which has adverse effects on the human body and the environment, and this has become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05B32B15/02
Inventor 远山丰久杉浦隆典田口武彦
Owner SUMITOMO RIKO CO LTD
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