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Method for coloring aluminum surface

The technology of aluminum surface and aluminum sheet is applied in the field of coloring aluminum surface, which can solve the problems of narrow adjustable color range, high production cost, environmental pollution, etc., and achieve the effects of wide color adjustment range, convenient operation and low cost.

Inactive Publication Date: 2016-03-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have conducted in-depth research on aluminum coloring mechanism and oxide film coloring technology. At present, the most widely used aluminum coloring method is anodic oxidation electrolytic coloring method. Although this coloring method meets people's needs to a certain extent, its process is complicated. , high production costs, narrow adjustable color range and other issues have not been well resolved
In addition, in the process of electrolytic coloring, it is usually necessary to deposit metal in the membrane pores, which is very easy to pollute the environment

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  • Method for coloring aluminum surface
  • Method for coloring aluminum surface
  • Method for coloring aluminum surface

Examples

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Embodiment 1

[0025] A method for coloring an aluminum surface, comprising the steps of:

[0026] (1) Cleaning high-purity aluminum sheets with a mass fraction ≥ 99.99% in acetone, absolute ethanol, and deionized water in order to obtain clean aluminum sheets;

[0027] (2) With the clean aluminum flake that step (1) obtains as anode, graphite is cathode, carry out constant voltage electrochemical polishing in the mixed solution that the volume ratio of perchloric acid and dehydrated alcohol is 0.5 under-5 ℃, voltage is 26V, the polishing time is 2 minutes, and the polished aluminum sheet is obtained;

[0028] (3) the aluminum flake of polishing that obtains with step (2) is anode, and graphite is cathode, and the volume ratio of solution A (0.5mol / L oxalic acid aqueous solution) and solution B (dehydrated alcohol) is the mixing of A:B=1 Solution to carry out anodic oxidation process, the temperature is -3 ℃; the anodic oxidation reaction process is as follows, first use constant current de...

Embodiment 2

[0031] A method for coloring an aluminum surface, comprising the steps of:

[0032] (1) Cleaning high-purity aluminum sheets with a mass fraction ≥ 99.99% in acetone, absolute ethanol, and deionized water in order to obtain clean aluminum sheets;

[0033] (2) With the clean aluminum sheet that step (1) obtains as anode, graphite is cathode, carry out constant voltage electrochemical polishing in the mixed solution that the volume ratio of perchloric acid and dehydrated alcohol is 0.3 under 0 ℃, voltage is 25V , the polishing time is 3 minutes to obtain a polished aluminum sheet;

[0034] (3) the aluminum flake of polishing that obtains with step (2) is anode, and graphite is cathode, and the volume ratio of solution A (0.5mol / L oxalic acid aqueous solution) and solution B (dehydrated alcohol) is the mixing of A:B=2 solution to carry out the anodic oxidation process, the temperature is 0 ℃; the anodic oxidation reaction process is as follows, first use the constant current den...

Embodiment 3

[0037] A method for coloring an aluminum surface, comprising the steps of:

[0038] (1) Cleaning the high-purity aluminum flakes with a mass fraction ≥ 99.99% in acetone, absolute ethanol, and deionized water in order to obtain clean aluminum flakes;

[0039] (2) With the clean aluminum sheet that step (1) obtains as anode, graphite is cathode, carry out constant voltage electrochemical polishing in the mixed solution that the volume ratio of perchloric acid and dehydrated alcohol is 0.2 under 10 ℃, voltage is 16V , the polishing time is 10 minutes to obtain a polished aluminum sheet;

[0040] (3) the polished aluminum sheet that obtains with step (2) is anode, and graphite is cathode, and the volume ratio of solution C (0.2mol / L oxalic acid aqueous solution) and solution B (dehydrated alcohol) is the mixing of C:B=200 solution to carry out anodic oxidation process at a temperature of 5°C to obtain an aluminum sheet with a yellow-green anodized aluminum film on the surface; t...

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Abstract

The invention discloses a method for coloring an aluminum surface. The method comprises the steps that a high-purity aluminum sheet is cleaned and polished through a conventional method, the polished aluminum sheet serves as the anode, graphite serves as the cathode, an oxalic acid-ethyl alcohol-water mixed solution serves as an electrolyte, and then the anodic oxidation process is conducted for coloring the aluminum surface; and by adjusting anodic oxidation conditions such as the voltage, the current density and the composition of the electrolyte as well as placing the aluminum sheet after anodic oxidation is conducted into a chromium trioxide and phosphoric acid mixed aqueous solution for treatment, the color on the aluminum surface can be adjusted. The method has the advantages that the color adjusting range is wide, the cost is low, equipment is simple, operation is convenient, pollution is low, and metal deposition is not needed, so that the feasibility of applying the method to production is greatly improved.

Description

technical field [0001] The invention relates to the field of metal surface coloring, in particular to a method for coloring aluminum surfaces. Background technique [0002] Metal surface coloring is one of the important directions in the field of surface science and technology research and application, which can effectively prevent metal corrosion and play a decorative effect. After the metal is colored, the light will be refracted or reflected through the metal surface film, and light interference will occur, so that the surface will show different colors. In addition, some film layers have their own color, and at this time, the surface shows the color of the film layer itself. Metal coloring treatment processes mainly include: (1) chemical coloring method. Put metal parts in chemical reagents, and form a colored film on the surface through chemical reactions. (2) Electrochemical coloring method. The surface of the workpiece is colored by an electrochemical process. (3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14
CPCC25D11/14
Inventor 李屹金世遇覃玉燕
Owner SOUTH CHINA UNIV OF TECH
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