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Surface processing technique for bacterium resistance, erosion resistance and tarnish resistance of aluminum or aluminum alloy material

An aluminum alloy material and surface treatment technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, anodic oxidation, etc., can solve the problem of easy discoloration and achieve excellent corrosion resistance

Active Publication Date: 2011-06-08
CHANGZHOU GARDENSUN ANTI BACTERIAL MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although these licenses (patents) can provide technical means for bacteria-making—such as adding water-soluble silver salts, silver salts are filled in the oxide film and are prone to discoloration under sunlight, ultraviolet light, etc.

Method used

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  • Surface processing technique for bacterium resistance, erosion resistance and tarnish resistance of aluminum or aluminum alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] L1 (pure aluminum plate) plate 1mm thick, 50×50mm 2 The test plate, after acid degreasing, in H 2 SO 4 150 g / L, 5 g / L chromic acid, 1 g / L silver sulfate, 50 mL / L ethanol, and 50 mL / L ethanol, pass positive and negative alternating currents in positive and negative directions for 6 seconds each, voltage 18 volts, temperature 18°C ​​(constant temperature) Oxidation under low temperature for 15 minutes, film thickness, antibacterial performance, anti-discoloration and other effects. See Table 1.

Embodiment 2

[0023] 6063 profile (square pipe material), wall thickness 0.8mm, cut into 50×50mm test pieces as samples. In the solution of 150 g / L sulfuric acid, 5 g / L chromic acid, 1 g / L silver sulfate, and 50 mL / L ethanol, the positive and negative charging and changing currents are passed in the solution, and the positive and negative directions are 4 seconds each, and the current density is 2 A / dm 2 , voltage 15-18 volts, time 15 minutes, temperature 18 ° C (constant temperature), after oxidation, in pure water, heated to 90-95 ° C, soaked for 10-15 minutes, its antibacterial, anti-corrosion, anti-discoloration effects are listed in Table 1 .

Embodiment 3

[0025] Test material, same as embodiment 1 is the L1 plate

[0026] The size of the test piece is the same, the pretreatment process and sealing process are the same, and the composition of the oxidation solution is:

[0027] 150 grams / liter of sulfuric acid, 1 gram / liter of silver sulfate, 50 milliliters / liter of ethanol, do not add chromic acid, the current form of passing through, current density and voltage are all identical with embodiment 1, for comparison.

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Abstract

The invention relates to a surface processing technique for the bacterium resistance, the erosion resistance and the tarnish resistance of aluminum or aluminum alloy material, comprising the following steps: firstly, degreasing processing is carried out on an aluminum material used as a workpiece, the aluminum material after being degreased is put into an acid solution, the workpiece is used as one pole, an aluminum plate or a lead plate is used as the other pole and is electrified with alternating current, the liquid temperature is kept between 0 DEG C and 30 DEG C, an oxidation film with bacterium resistance, erosion resistance and tarnish resistance is formed on the surface of the aluminum material after oxidation for 10-30 minutes, and finally, the workpiece is taken out and placed inpurified water of 90-100 DEG C and closed for 15-20 minutes. The acid solution has the components and the content that each liter of acid solution contains 80-150 grams of industrial grade sulfuric acid, 2-10 grams of chromic anhydride and 0.1-1.5 grams of water soluble silver salt. The surface of the aluminum material after being processed by the invention is provided with a layer of oxidation film, silver compounds with bacterium resistance and tarnish resistance, such as silver chromate, silver dichromate and the like, are formed in the film, then the film is closed by hot water, and the erosion resistant performance is more excellent.

Description

Technical field: [0001] The invention belongs to metal surface treatment technology, in particular to an antibacterial, anti-corrosion and anti-discoloration surface treatment process for aluminum or aluminum alloy materials. Background technique: [0002] 1. Japanese Patent Application Publication No. 62-182298: the aluminum material is first oxidized in sulfuric acid, and then electrophoretic coating of antibacterial agents and antifungal agents in the membrane pores to obtain antibacterial properties. [0003] 2. Japanese Patent Publication No. 5-14033: After the aluminum material is oxidized with sulfuric acid, metal silver compounds and copper compounds are filled in the film pores, and at the same time, the aluminum material forms an electrolytic coloring film, so that it has antibacterial properties. [0004] 3. Japan’s Special Opening 9-71897 Bulletin: After the oxide film of the aluminum material is formed, in a solution of semiconductor microparticles dissolved wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/16
Inventor 周国桢陈方大王思勤
Owner CHANGZHOU GARDENSUN ANTI BACTERIAL MATERIALS TECH
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