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Method for coloring aluminum and alloy surface thereof

An aluminum alloy surface and aluminum alloy technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of not being applied, unable to develop color, high equipment cost, etc., and achieve beautiful color, convenient adjustment means, The effect of simple equipment

Inactive Publication Date: 2011-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the alumina photonic crystals in the prior art are prepared by the current method, they cannot be directly colored on aluminum or aluminum alloy substrates, the equipment cost is high, and they cannot be applied to parts with complex shapes because they are related to the sample area. Therefore, currently The concept of alumina photonic crystals has not been applied to the coloring process of aluminum or aluminum alloys

Method used

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  • Method for coloring aluminum and alloy surface thereof
  • Method for coloring aluminum and alloy surface thereof
  • Method for coloring aluminum and alloy surface thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is implemented under the following technical requirement conditions:

[0034] (1) Cut a high-purity aluminum sheet with a thickness of 0.3mm and a purity of 99.999% into 6cm×7.5cm, and perform electropolishing in a solution mixed with ethanol and perchloric acid at a volume ratio of 4:1. The polishing time is 3 minutes, and the voltage is 21V.

[0035](2) At 0°C, using a sulfuric acid solution with a concentration of 1.1 mol / liter as the electrolyte, aluminum as the anode, and graphite as the cathode, anodic oxidation is carried out, and the oxidation area is a rectangle of 5cm×6.5cm. The specific oxidation process is as follows: first, 14V constant voltage pre-oxidation for 1 hour, and then use periodic voltage for oxidation. The periodic voltage waveform of a cycle is as follows: a sinusoidal rise from 6.5V to 14.5V within 85 seconds, and maintain for 85 seconds, then a linear drop from 14.5V to 11V within 42.5 seconds, and then a sinusoidal drop from...

Embodiment 2

[0038] This embodiment is implemented under the following technical requirement conditions:

[0039] At 1°C, other conditions are the same as in Example 1, and the periodic oxidation voltage waveform becomes: a sinusoidal rise from 6.5V to 14.5V within 120 seconds, and maintain for 120 seconds, and then drop linearly from 14.5V to 11V, followed by a sine drop from 11V to 7.5V in 220 seconds, and finally a sine drop from 7.5V to 6.5V in 680 seconds. The periodic voltage is repeated 105 times.

[0040] Carrying out the above steps can obtain brightly colored and evenly colored red colored film. Such as figure 2 As shown, the band gap of the visible light transmission spectrum of the colored film is 620nm, and the intensity is 3.5%. The reflection peak of colored aluminum is located at 656nm, and the intensity reaches 92.3%, such as image 3 shown.

Embodiment 3

[0042] This embodiment is implemented under the following technical requirement conditions:

[0043] At 2°C, other conditions are the same as in Example 1, and the periodic oxidation voltage waveform becomes: a sinusoidal rise from 6.5V to 13.5V within 120 seconds, and maintain for 120 seconds, and then drop linearly from 13.5V to 10.5V, followed by a sine drop from 10.5V to 7.5V in 220 seconds, and finally a sine drop from 7.5V to 6.5V in 680 seconds. The periodic voltage is repeated 105 times.

[0044] By implementing the above method, a blue colored film with uniform color and beautiful appearance can be obtained.

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Abstract

The invention discloses a method for coloring aluminum and an alloy surface thereof, which comprises the following steps of: at first, cleaning and polishing the aluminum or the aluminum alloy surface; carrying out constant-pressure anode preoxidization for 20 minutes to 3 hours under the preoxidization voltage of 10 to 20 volts by using sulfuric acid electrolyte with the concentration of 0.1 to 3mol / liter under the conditions that the well-processed aluminum or aluminum alloy is used as an anode and graphite is used as a cathode; and then oxidizing the aluminum or the aluminum alloy by utilizing a voltage which varies periodically based on time to obtain a structurally laminar alumina photonic crystal, and coloring the aluminum or the aluminum alloy surface by the structural color of an optical forbidden band of the alumina photonic crystal, so that different colors can be adjusted within a scope of visible lights by maintaining constant time and changing the voltage only or maintaining constant voltage and changing time only. The coloration method of the invention has the advantages of no need of depositing metal ions, simple process and low cost, wide adjustment scope of colorsand less pollution.

Description

technical field [0001] The invention relates to the field of coloring technology for the surface of aluminum and its alloys using anodic oxidation structural color, in particular to a method for coloring the surface of aluminum and its alloys. Background technique [0002] Since the 1980s in my country, the coloring mechanism and oxide film coloring technology of aluminum and aluminum alloys have been studied. At present, the most widely used coloring method for aluminum and aluminum alloys is the anodic oxidation electrolytic coloring method. Electrolytic oxidation combines anodic oxidation and electrochemical deposition processes. First, the aluminum sheet or aluminum alloy sheet is oxidized in an acid solution to form a honeycomb porous oxide film, and then electrolytic treatment is performed in a solution containing metal salt ions. Under the action of an electric field , to deposit metal ions into the pores of the oxide film. According to the different anodic oxidation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14
Inventor 凌志远刘忆森常毅胡星
Owner SOUTH CHINA UNIV OF TECH
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