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Aluminum material anodization electrolytic coloring method for achieving multiple colors in one tank

An anodic oxidation and electrolytic coloring technology, which is applied in the field of aluminum electrolytic coloring, can solve the problems of cumbersome color electrolytic coloring process, inability to prepare aluminum materials, monotony, etc., and achieve the effect of green environmental protection, low cost and simple process

Inactive Publication Date: 2012-10-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional electrolytic coloring process is cumbersome and monotonous in color, and aluminum materials of various colors cannot be prepared in the same bath solution. For example, the electrolytic coloring process proposed in CN 1016080B is used to obtain the bronze color series of aluminum and aluminum alloy anodic oxidation films; CN 86101215B The proposed electrolytic coloring process is used to obtain purple-red series for aluminum and aluminum alloys; the selenium salt electrolytic coloring method proposed in CN 1059476C is used to obtain a golden yellow aluminum alloy

Method used

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  • Aluminum material anodization electrolytic coloring method for achieving multiple colors in one tank
  • Aluminum material anodization electrolytic coloring method for achieving multiple colors in one tank

Examples

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Embodiment 1～4

[0022] A multi-color anodic oxidation electrolytic coloring method for aluminum materials in one tank, which is prepared by the following steps:

[0023] (1) Select 6063 alloy aluminum for anodic oxidation, and use conventional methods for degreasing, surface cleaning, and polishing. Among them, use alcohol to degrease, use dilute sulfuric acid to clean the surface, and perform electrochemical polishing.

[0024] (2) Select the current source for anodic oxidation, the electrolyte is sulfuric acid, the concentration of the electrolyte is C (g / L) and the temperature of the electrolyte is T (° C.). In the electrolyte, the 6063 alloy aluminum processed in step (1) is used as the anode, and the graphite is used as the cathode, and a higher current density i is applied. h (A / dm 2 ) hold time t h (s), then drop to lower current current density i 1 (A / dm 2 ) hold time t 1 (s). Repeat the above steps P times. C, T, i in each embodiment h i 1 , t h , t 1 , See Table 1 for th...

Embodiment 5～8

[0029] A multi-color anodic oxidation electrolytic coloring method for aluminum materials in one tank, which is prepared by the following steps:

[0030] (1) Select 6061 alloy aluminum material for anodic oxidation, and use conventional methods for degreasing, surface cleaning, and polishing. Degrease with acetone, clean the surface with sodium carbonate, and perform electrochemical polishing.

[0031] (2) Anode oxidation is carried out by a voltage source, the electrolyte is sulfuric acid, the concentration of the electrolyte is C (g / L) and the temperature of the electrolyte is T (° C.). In the electrolyte, aluminum is used as the anode, and a higher voltage U is applied. h (v) hold time t h (s), at t 1 (s) time to drop to a lower voltage U 1 (v), and keep time t 1 (s), then at t 2 Rise to a higher voltage U within a time of (s) h (v). Repeat the above steps P times. C, T, U in each embodiment h , U 1 , t h , t 1 , t 1 , t 2 , See Table 2 for the value of P. O...

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Abstract

The invention discloses an aluminum material anodization electrolytic coloring method for achieving multiple colors in one tank. According to the invention, an aluminum material is first subjected to common processes such as de-oiling, surface cleaning, and polishing; the aluminum material is placed in a sulfuric acid electrolyte, wherein the aluminum material serves as an anode, and an inert material serves as a cathode; anodization is carried out through a current source or a voltage source; when anodization is carried out through a current source, in one time of anodization, a current density is decreased from high to low, and a ratio of the high current density to the low current density is 2-10:1, wherein in the one time of anodization, the high current density is higher than the low current density; a current maintenance time of the high density current is 8-300s, and the current maintenance time of the low density current is 20-1000s; electrolysis is repeated 30-300 times, and a total thickness of an alumina membrane is controlled at 6-60 micrometers, such that the colored aluminum material is prepared. With the method provided by the invention, the hue, lightness and purity of the aluminum material can be adjusted within a large range in a same tank liquid, and the whole process is green and environment-friendly.

Description

technical field [0001] The invention relates to an aluminum material electrolytic coloring method, in particular to a one-tank multi-color aluminum material anodic oxidation electrolytic coloring method, which realizes that aluminum materials of various colors can be obtained in the same tank solution. Background technique [0002] Metal aluminum is widely used in various industries. With the improvement of living standards, people put forward higher requirements for the functionality and decoration of aluminum. Anodizing is an effective aluminum surface treatment technology. Aluminum anodized film electrolytic coloring technology can make the colored film on the surface of aluminum or aluminum alloy products have better corrosion resistance, wear resistance and light resistance. The common electrolytic coloring technology is to anodize the aluminum first, and then electrolyze it in an electrolyte containing soluble metal salts such as Ni, Co, Cu, Sn, etc., so that the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14C25D11/12
Inventor 胡星凌志远
Owner SOUTH CHINA UNIV OF TECH