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Aluminium basis material surface treatment method

A surface treatment and base material technology, which is applied in the field of surface treatment of aluminum base materials, can solve the problems of insufficient corrosion resistance, filiform corrosion, easy formation of oxide film, etc., and achieve the goal of improving corrosion resistance and preventing corrosion Reduced effect

Inactive Publication Date: 2007-05-30
CENTRAL MOTOR WHEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, since the aluminum base material has insufficient corrosion resistance, if there is a scratch on the surface, filiform corrosion occurs and an oxide film is easily formed on the surface, so it is necessary to apply pre-coating treatment to the surface of the aluminum base material Chemical conversion treatment in to improve corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Aluminum alloy is used to mold the aluminum wheel, the aluminum wheel is taken out from the mold, heat-treated, then shot blasted, and then the following steps (1) to (18) are sequentially performed to obtain a coated aluminum wheel.

[0057] (1) Strong alkaline aqueous solution treatment

[0058] Treatment solution: 5% (w / v) sodium hydroxide (pH13.1)

[0059] Processing temperature: 40°C

[0060] Processing time: 150 seconds

[0061] Etching amount: 2500mg / m 2

[0062] (2) Washing × 2 times

[0063] (3) acidic aqueous solution treatment

[0064] Treatment solution: 5-10% (w / v) nitric acid (below pH 1.5)

[0065] Processing temperature: 30°C

[0066] Processing time: 30 seconds

[0067] (4) Washing × 2 times

[0068] (5) hot water washing

[0069] (6) Degreasing treatment

[0070] Treatment solution: 3% (w / v) Surfcleaner C294 (manufactured by Nippon Peint Co., Ltd.)

[0071] Processing temperature: 50~60℃

[0072] Processing time: 115 seconds

[0073] (7) ...

Embodiment 2

[0099] By using an aluminum alloy, the aluminum wheel is molded, the aluminum wheel is taken out from the mold, heat-treated, shot blasted, and then the following steps (1) to (16) are sequentially performed to obtain a coated aluminum wheel.

[0100] (1) Strong alkaline aqueous solution treatment

[0101] Treatment solution: 5% (w / v) sodium hydroxide (pH13.1)

[0102] Processing temperature: 40°C

[0103] Processing time: 150 seconds

[0104] Etching amount: 2500mg / m 2

[0105] (2) Washing × 2 times

[0106] (3) acidic aqueous solution treatment

[0107] Treatment solution: 5-10% (w / v) nitric acid (below pH 1.5)

[0108] Processing temperature: 30°C

[0109] Processing time: 30 seconds

[0110] (4) Washing × 2 times

[0111] (5) hot water washing

[0112] (6) Degreasing treatment

[0113] Treatment liquid: 3% (w / v) Faincre-na-FC-359 (manufactured by Pa-Ka-Co., Ltd.)

[0114] Processing temperature: 50~60℃

[0115] Processing time: 115 seconds

[0116] (7) Washin...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To provide a pretreatment method which imparts a chromium-free chemical conversion coating adhesiveness to a paint film and corrosion resistance equivalent to or better than those of a chromating conversion coating containing hexavalent chromium ions, when an aluminum-based substrate is subjected to the chromium-free chemical conversion treatment as an alternative method for the chromate conversion treatment.SOLUTION: A surface treatment method for the aluminum-based substrate comprises the steps of: subjecting the aluminum-based substrate to a treatment process including the chemical conversion treatment; and then painting it. The method also includes treating the aluminum-based substrate with a strongly alkaline aqueous solution or electrolyzed alkaline water before the step prior to the painting step including the chemical conversion treatment to enhance a cleanliness degree of the surface of the aluminum-based substrate.

Description

technical field [0001] The invention relates to a surface treatment method for an aluminum base material. Background technique [0002] A film of aluminum oxide, dirt, oil, and the like adhere to the surface of the aluminum substrate, which hinders the adhesion of the coating film. Therefore, it is necessary to remove the above-mentioned film, oil, and the like by coating pretreatment before coating. [0003] In addition, since the aluminum base material has insufficient corrosion resistance, if there is a scratch on the surface, filiform corrosion occurs and an oxide film is easily formed on the surface, so it is necessary to apply pre-coating treatment to the surface of the aluminum base material The chemical conversion treatment in it improves the corrosion resistance. Moreover, the adhesiveness of an aluminum base material and a coating film can be improved by this chemical conversion process. [0004] As this chemical conversion treatment, a chromate treatment is usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/22C23G5/00
CPCC23C22/78C23G1/22
Inventor 后藤治光藤井吉智松下恒久
Owner CENTRAL MOTOR WHEEL CO LTD
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