Coloring method adopting aluminium alloy alternate current electrolysis for precipitating silver and copper

A technology of electrolytic deposition and electrolytic coloring, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of poor stability of coloring liquids, achieve long-lasting antibacterial and bactericidal effects, convenient operation, and low cost of coloring treatment Effect

Active Publication Date: 2014-11-19
SHISHI XINGHUO ALUMINUM PROD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the poor stability of the current coloring solution and provide a coloring method for aluminum alloy AC electrolytic deposition of silver and copper. The process is simple, the operation is convenient, the colo

Method used

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  • Coloring method adopting aluminium alloy alternate current electrolysis for precipitating silver and copper
  • Coloring method adopting aluminium alloy alternate current electrolysis for precipitating silver and copper
  • Coloring method adopting aluminium alloy alternate current electrolysis for precipitating silver and copper

Examples

Experimental program
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Effect test

Example Embodiment

[0036] Example 1:

[0037] The aluminum alloy sheet after degreasing, oxide film removal, ash removal, water washing and other pretreatments contains 5g / L Al 2 (SO 4 ) 3 ·18H 2 O and 170g / LH 2 SO 4 After electrolyzing at 19-21°C and 14V DC voltage for 30 minutes in a concentrated solution, washing and soaking to remove the surface electrolyte, an aluminum alloy sheet with a porous oxide film with a thickness of about 15-20 microns is obtained.

[0038] Use H 2 SO 4 17g / L, AgNO 3 5g / L, CuSO 4 ·5H 2 O 1.5g / L, MgSO 4 ·7H 2 O 20g / L, glycine 3.2g / L to prepare the coloring electrolyte, the aluminum alloy sheet is subjected to alternating electrolytic coloring at a temperature of 25°C, then washed with water, soaked to remove the surface electrolyte, and finally sealed with hot water. Table 1 below shows the adhesion color of AC electrolytic aluminum alloy under different time and AC voltage.

[0039] Table 1 When CuSO 4 ·5H 2 Effect of AC electrolysis voltage and time on the coloring of al...

Example Embodiment

[0041] Example 2:

[0042] After pretreatments such as degreasing, oxide film removal, ash removal, and water washing, the aluminum alloy sheet contains 5g / L Al 2 (SO 4 ) 3 ·18H 2 O and 170gLH 2 SO 4 In a concentrated solution, electrolyze at 19-21°C and 14V DC voltage for 30 minutes, wash and immerse the surface electrolyte to remove the aluminum alloy sheet with a porous oxide film with a thickness of about 15-20 microns.

[0043] Use H 2 SO 4 17g / L, AgNO 3 5g / L, CuSO 4 ·5H 2 O 2.0g / L, MgSO 4 ·7H 2 O 20g / L, glycine 3.2g / L to prepare coloring electrolyte. Perform AC electrolytic coloring on the aluminum alloy sheet at a temperature of 25°C, then wash and soak to remove the surface electrolyte, and finally hot water sealing treatment. Table 2 below shows the adhesion color of AC electrolytic aluminum alloy under different time and voltage.

[0044] Table 2 When CuSO 4 ·5H 2 Effect of AC electrolysis voltage and time on the coloring of aluminum alloy at O ​​2.0g / L

[0045]

Example Embodiment

[0046] Example 3:

[0047] The pre-treated aluminum alloy sheet for degreasing, removing oxide film, etc. contains 5g / L Al 2 (SO 4 ) 3 ·18H 2 O and 170gLH 2 SO 4 In a concentrated solution, use DC electrolysis at 19-21°C and 14V for 30 minutes, wash and soak to remove the surface electrolyte, and obtain a porous oxide film with a thickness of about 15-20 microns.

[0048] Use H 2 SO 4 17g / L, AgNO 3 5g / L, CuSO 4 ·5H 2 O 2.5g / L, MgSO 4 ·7H 2 O 20g / L, glycine 3.2g / L to prepare coloring electrolyte. Perform AC electrolytic coloring on the aluminum alloy sheet at a temperature of 25°C, then wash and soak to remove the surface electrolyte, and finally hot water sealing treatment. Table 3 below shows the adhesion color of AC electrolytic aluminum alloy under different time and voltage.

[0049] Table 3 When CuSO 4 ·5H 2 Effect of AC electrolysis voltage and time on the coloring of aluminum alloy at O ​​2.5g / L

[0050]

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Abstract

The invention provides a coloring method adopting aluminium alloy alternate current electrolysis for precipitating silver and copper. The coloring method comprises the following steps: after pretreatment such as degreasing and oxidation film removing, an aluminium alloy piece is subjected to direct current electrolysis in the sulfuric acid medium to obtain the aluminium alloy piece provided with a porous oxide-film; then, the aluminium alloy piece provided with the porous oxide-film is subjected to alternate current electrolysis; a coloring liquid comprises 15-20 g/L of H2SO4, 4-7 g/L of AgNO3, 1.5-2.5 g/L of CuSO4.5H2O, 18-25 g/L of MgSO4.7H2O, 2-7 g/L of a complexing agent A or 5-10 g/L of a complexing agent B; the technological conditions of the coloring liquid are as follows: the temperature is 5-35 DEG C, the time is 3-7 min and the voltage is 4-7 V; lastly, the alternate current electrolyzed porous oxide-film aluminium alloy piece is subjected to hot water sealing treatment to obtain aluminium alloy materials. According to the coloring method, the technology is simple, the coloring is uniform and stable, the decay resistance of the aluminium alloy is improved, the antibacterial and sterilizing rate of the aluminium alloy reaches 99.0%, the duration of antibacterial and bactericidal action is long and the coloring treatment cost is low; no insoluble deposition is precipitated in the coloring liquid for long-term use and the coloring liquid is stable.

Description

【Technical field】 [0001] The invention relates to a coloring method for aluminum alloy AC electrolytic deposition of silver and copper. 【Background technique】 [0002] Aluminum alloy has low density and high specific strength, which is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. . With the development of society and the improvement of people's living standards, people gradually realize the harm of pathogenic bacteria, thus promoting the development of aluminum alloys with bactericidal and antibacterial functions. As a medical aluminum alloy material, it must not only have excellent corrosion resistance, but also have bactericidal and antibacterial functions. [0003] Aluminum alloy will form a very thin oxide film less than 0.1 micron on its surface under...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/22C25D11/24
Inventor 王森林李瑞陈兴星陈世楠郭炎炎
Owner SHISHI XINGHUO ALUMINUM PROD CO LTD
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