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
CN102181902AInactive Publication Date: 2011-09-14SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2011-09-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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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