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A kind of interference coloring method of double-layer microstructure film on aluminum alloy surface

A technology of aluminum alloy surface and film interference, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problem of unclear coloring microcosmic mechanism, unstable color development of aluminum alloy, and incompatibility between color and weather resistance of aluminum alloy products and other problems, to achieve the effect of being convenient for industrial production, not requiring high output voltage accuracy, and easy to control

Active Publication Date: 2021-02-09
FOSHAN UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a double-layer microstructure thin film interference coloring method on the surface of aluminum alloys to solve the defects of the existing aluminum alloy products that the color and weather resistance cannot be balanced, the microcosmic mechanism of coloring is unknown, and the color development of aluminum alloys is unstable. , this technology improves the stability of multi-color electrolytic coloring of aluminum alloys, and realizes the problem that the color and weather resistance of aluminum alloy products cannot be balanced

Method used

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  • A kind of interference coloring method of double-layer microstructure film on aluminum alloy surface
  • A kind of interference coloring method of double-layer microstructure film on aluminum alloy surface
  • A kind of interference coloring method of double-layer microstructure film on aluminum alloy surface

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Experimental program
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Effect test

Embodiment 1

[0043] 1) Put the aluminum alloy sample in 45g / L NaOH, 1g / L C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 3 minutes. Rinse the sample after alkali etching with pure water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 4 minutes, after treatment, ensure that the surface of the sample is smooth and clean, with the same surface state;

[0044] 2) Put the pretreated sample into 108g / L sulfuric acid solution for anodic oxidation, the oxidation temperature is 10°C, and the current density is 1.2A / dm 2 , and the cathode plate is made of high-purity graphite plate;

[0045] 3) After cleaning the oxidized aluminum alloy sample with pure water, put it into SnSO 4 and NiSO 4 Alternating current (AC) and direct current (DC) multiple superposition (AC-DC-AC-AC-DC-AC) electrodeposition is carried out in the deposition solution of the main salt, and the deposition temperature is 25°C.

[0046] Wherein, the composition of deposition liquid is: ...

Embodiment 2

[0064] 1) Put the aluminum alloy sample in 45g / L NaOH, 1g / L C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 4 minutes. Rinse the sample after alkali etching with pure water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 5 minutes, after treatment, ensure that the surface of the sample is smooth and clean, with the same surface state; 2) Put the pre-treated sample into 180g / L sulfuric acid solution for anodic oxidation, and the oxidation temperature is 25°C , the current density is 1.5A / dm 2 , and the cathode plate is made of high-purity graphite plate;

[0065] 3) After cleaning the oxidized aluminum alloy sample with pure water, put it into SnSO 4 and NiSO 4 Alternating current (AC) and direct current (DC) multiple superposition (AC-DC-AC-AC-DC-AC) electrodeposition is carried out in the deposition solution of the main salt, and the deposition temperature is 25°C.

[0066] Wherein, the composition of deposition liquid is:

[0...

Embodiment 3

[0084] 1) Put the aluminum alloy sample in 45g / L NaOH, 1g / LC at a temperature of 70°C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 3 minutes. Rinse the sample after alkali etching with pure water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 5 minutes, after treatment, ensure that the surface of the sample is smooth and clean, with the same surface state;

[0085] 2) Put the pretreated sample into 180g / L sulfuric acid solution for anodic oxidation, the oxidation temperature is 20°C, and the current density is 1.4A / dm 2 , and the cathode plate is made of high-purity graphite plate;

[0086] 3) After cleaning the oxidized aluminum alloy sample with pure water, put it into SnSO 4 and NiSO 4 Alternating current (AC) and direct current (DC) multiple superposition (AC-DC-AC-AC-DC-AC) electrodeposition is carried out in the deposition solution of the main salt, and the deposition temperature is 25°C.

[0087] Wherein, the composition...

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Abstract

The invention discloses an interference coloring method for an aluminum alloy surface double-layer microstructure thin film. The method comprises the following steps that 1) an aluminum alloy sample is correspondingly put into an alkali etching solution and an acid washing solution for pretreatment; 2) the sample subjected to pretreatment is put into a 108-190 g / L sulfuric acid solution for anodicoxidation; 3) the oxidized aluminum alloy sample is cleaned by using distilled water, and then is put into a deposition solution taking SnSO4 and NiSO4 as main salt for multiple superimposed electrodeposition through alternating current and direct current; and 4) the electrodeposited sample is put into an environment-friendly alkaline earth salt hole sealing solution for hole sealing treatment for 15-20 minutes. According to the method, the technology does not relate to use of organic dyes, operations is convenient and fast, the effects of being environmentally friendly and non-toxic is achieved, moreover, a coating has good corrosion resistance and weather resistance and is not prone to color fading. The prepared colorful coloring sample coating is firm in binding force, good in corrosion resistance, rich and diverse in color and capable of being used for building sectional materials, electronic equipment, household appliances and the like.

Description

technical field [0001] The invention relates to an interference coloring method of a double-layer microstructure thin film on the surface of an aluminum alloy, and belongs to the technical field of functionalized decorative materials. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in the industry, and is widely used in architectural decoration, aerospace, electronic equipment, home appliance hardware and other fields. In order to improve the decoration and service life of aluminum alloy products, various surface treatment technologies are applied to the surface of aluminum alloy. Among them, anodizing technology can not only improve the surface hardness and corrosion resistance of aluminum alloy profiles, but also provide good coloring conditions for aluminum alloys. Due to its low cost and high performance, electrolytically colored anodized film has become one of the important coloring methods in the construction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16C25D11/08C25D11/22C25D11/24
Inventor 陈东初魏红阳常萌蕾
Owner FOSHAN UNIVERSITY
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