Method for preparing black oxidation film on 7A04 aluminum alloy surface

A technology of aluminum alloy surface and black oxidation, which is applied in the direction of anodic oxidation, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of complex processing technology of the overall colored film, poor weather resistance and light resistance of the dyed film, and short service life, etc. Achieve the effects of low processing energy consumption, good light resistance and long service life

Active Publication Date: 2019-08-16
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

[0003] In the prior art, the oxide film colored by aluminum alloy includes integral colored film, dyed film, etc., but the weather resistance and light resistance of the dyed film are poor, the service life is short, the processing technology of the integral colored film is complicated, and the processing energy consumption is high.

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  • Method for preparing black oxidation film on 7A04 aluminum alloy surface

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Embodiment 1

[0034] A method for preparing black oxide film on the surface of 7A04 aluminum alloy, comprising the steps of:

[0035] Step A1, the surface of the 7A04 aluminum alloy workpiece to be treated is polished on 400#, 600#, 800# and 1200# sandpaper in sequence, and polished with a polishing cloth, then cleaned with deionized water and absolute ethanol, and dried in the air , so as to produce a clean aluminum alloy workpiece.

[0036] Step A2, washing the cleaned aluminum alloy workpiece with alkali at 60°C for 60s, then pickling at room temperature for 30s, washing with deionized water and absolute ethanol and drying in the air, so as to obtain the pretreated aluminum alloy workpiece alloy workpiece.

[0037] Step A3, placing the aluminum alloy workpiece after the pretreatment in 160g / L H 2 SO 4 Carry out one-time electrolysis in the composed electrolyte, the one-time electrolysis uses the aluminum alloy workpiece after the pretreatment as the anode, the graphite plate as the ca...

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Abstract

The invention discloses a method for preparing a black oxidation film on 7A04 aluminum alloy surface. The method comprises the following steps of grinding the surface of the aluminum alloy workpiece to be treated on an abrasive paper, cleaning and drying so as to prepare a cleaned aluminum alloy workpiece; carrying out alkali washing on the cleaned aluminum alloy workpiece at 60 DEG C for 50-80 seconds, then carrying out acid washing at normal temperature for 20-40 seconds, cleaning with deionized water and absolute ethyl alcohol and airing so as to prepare the pre-treated aluminum alloy workpiece; placing the pre-treated aluminum alloy workpiece in an electrolyte for primary electrolysis, preparing a uniform and transparent anode oxide film on the surface of the aluminum alloy workpiece;placing the aluminum alloy workpiece subjected to primary electrolysis in a coloring solution for secondary electrolysis so as to prepare a uniform black oxidation film on the surface of the aluminumalloy workpiece. According to the method, the prepared film is compact in film layer, good in color retention, weather resistance and light resistance, long in service life, simple in processing technology, and low in processing energy consumption.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy coloring, in particular to a method for preparing a black oxide film on the surface of a 7A04 aluminum alloy. Background technique [0002] At present, in the surface coloring technology of aluminum and aluminum alloy products, the black film layer is widely used in navigation, optical instruments, building decoration materials and other fields because of its unique optical function and decorative performance. [0003] In the prior art, the aluminum alloy colored oxide film includes integral colored film, dyed film, etc., but the dyed film has poor weather resistance and light resistance, short service life, and the integral colored film has complicated processing technology and high processing energy consumption. Contents of the invention [0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for preparing a black oxide film on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16C25D11/22
CPCC25D11/08C25D11/16C25D11/22
Inventor 陈飞徐乾坤解承东陈津京王康赵莹
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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