Chemical conversion solution for aluminum or aluminum alloy, chemical conversion method, and chemical conversion film

A technology of chemical conversion treatment and aluminum alloy, which is applied in the direction of coating, etc., can solve the problems of no chemical conversion treatment film tone, no effect of low corrosion resistance alloy aluminum, etc., and achieve high safety and low pollution effect

Inactive Publication Date: 2017-10-13
OKUNO CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 2, there is no description about the color tone of the formed chemical conversion treatment film, nor does it show the effect on low corrosion resistance alloy-based aluminum.
[0005] Thus, according to the above-mentioned chromium-free chemical conversion treatment, the load on the environment can be further reduced, but it is difficult to form a golden film with sufficient corrosion resistance by a simple method like the conventional hexavalent chromium chemical conversion treatment

Method used

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  • Chemical conversion solution for aluminum or aluminum alloy, chemical conversion method, and chemical conversion film
  • Chemical conversion solution for aluminum or aluminum alloy, chemical conversion method, and chemical conversion film
  • Chemical conversion solution for aluminum or aluminum alloy, chemical conversion method, and chemical conversion film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A plate of A1050 (0.5×50×100 mm in size) was used as a treatment object (test piece), and the following pretreatment was performed.

[0059] 3.0% by mass of alkali degreasing agent "Top Al Clean 101" (trade name, manufactured by Okuno Pharmaceutical Co., Ltd.) was heated to 55° C., and the test piece was immersed for 1 minute for degreasing treatment, and then washed with water for 30 seconds. Moreover, the 7.0 mass % sodium hydroxide aqueous solution was heated to 55 degreeC as needed, the said test piece was immersed for 1 minute, it etched, and thereafter, it washed with water for 30 seconds. Next, the above-mentioned test piece was immersed in 10.0% by mass of a stain remover "Top desmat N-20" (Top desmat N-20 trade name, manufactured by Okuno Pharmaceutical Co., Ltd.) for about 30 to 60 seconds to carry out stain removal. Remove, then wash with water for 30 seconds.

[0060] On the other hand, 1 g / L of sodium metavanadate was added and mixed to deionized water hea...

Embodiment 2～20 and comparative example 1～8

[0064] A chemical conversion treatment liquid containing the components described in Tables 1 to 4 was prepared, and the chemical conversion treatment was performed under the conditions described in Tables 1 to 4 using the test piece described in Tables 1 to 4 that had been subjected to the same pretreatment as in Example 1. For each test piece after the chemical conversion treatment, the film appearance and corrosion resistance were evaluated according to the following method, and the bath stability was also evaluated according to the following method. These results are shown in Tables 1-4.

[0065] (bath stability)

[0066] After each chemical conversion treatment liquid was prepared, it was left to stand for 30 days, and the state of the chemical conversion treatment liquid was observed and evaluated according to the following criteria.

[0067] A...No aggregation or precipitation occurs

[0068] C...aggregate or precipitate produced

[0069] (film appearance)

[0070] By...

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PUM

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Abstract

The present invention addresses the problem of providing a chemical conversion surface treatment solution capable of forming a chemical conversion film with excellent corrosion resistance and design on an article, in which the surface portion comprises aluminum or an aluminum alloy, using a process similar to conventional chemical conversion without using components that have high environmental impact such as hexavalent chromium, trivalent chromium, or fluorine. The present invention relates to a chemical conversion solution for aluminum or aluminum alloy comprising an aqueous alkaline solution that contains a permanganic acid compound and at least one kind of metal oxygen acid compound selected from a group consisting of vanadic acid compounds, molybdic acid compounds, tungstic acid compounds, zirconic acid compounds and niobic acid compounds.

Description

technical field [0001] The present invention relates to a chemical conversion treatment liquid for aluminum or aluminum alloy, a chemical conversion treatment method and a chemical conversion film. Background technique [0002] Aluminum-based metal materials (particularly low-corrosion-resistant alloy-based aluminum containing a large amount of copper such as A2024) are chemically treated to form a metal compound film on their surface in order to improve their corrosion resistance or rust resistance. [0003] Typical chemical conversion treatments include hexavalent chromium chemical conversion treatment and trivalent chromium chemical conversion treatment. The film obtained by the hexavalent chromium conversion treatment has a golden color tone and is also excellent in designability. However, the hexavalent chromium conversion treatment liquid contains components that damage the environment, such as hexavalent chromium and fluorine, and imposes a large load on the environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/66
CPCC23C22/66C09D1/00C09D5/084
Inventor 保田德岩崎保纪原健二片山顺一
Owner OKUNO CHEM IND CO LTD
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