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Method for preparing aluminum alloy anode oxide film by direct-current superposition pulse voltage

An anodic oxide film and anodic oxidation technology, applied in the direction of anodic oxidation, can solve the problem of high density and achieve the effect of high density, good corrosion resistance and good wear resistance

Inactive Publication Date: 2014-10-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, the object of the present invention is to provide a method for preparing aluminum alloy anodic oxide film by using DC superimposed pulse voltage, using DC superimposed pulse power supply to carry out anodic oxidation at normal temperature, which can be realized when the thickness of the oxide film is very low. High hardness, good wear resistance, high density

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  • Method for preparing aluminum alloy anode oxide film by direct-current superposition pulse voltage
  • Method for preparing aluminum alloy anode oxide film by direct-current superposition pulse voltage

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A aluminum alloy anodizing pretreatment

[0035] First, degrease the surface of aluminum alloy parts in a mixed solution of 26g / L sodium carbonate and 25g / L sodium borate at 60°C; etch in 30g / L SurTec495 at 55°C for 2min; in 170ml / LTURCO Liquid at 50°C Pickling in the acidic solution of Smut Go NC for 10 minutes; washing with water, observing the continuous water film on the surface of the aluminum alloy, and then anodizing;

[0036] B aluminum alloy anodized

[0037] Put the pretreated aluminum alloy in the anodic oxidation solution, use the lead plate as the cathode, the volume ratio of sulfuric acid is 7%, tartaric acid 25g / L, oxalic acid 40g / L, aluminum sulfate 3.6g / L. DC superimposed pulse voltage high voltage 19V, low voltage 17V, duty cycle 40%, frequency 30Hz, temperature 15-17°C, oxidation time 40min. Air agitation is performed during the anodizing process.

[0038] After C anodizing, wash with water and dry to obtain aluminum alloy anodic oxidation film.

...

Embodiment 2

[0041] A aluminum alloy anodizing pretreatment

[0042] First, degrease the surface of the aluminum alloy parts in a mixed solution of 30g / L sodium carbonate and 35g / L sodium borate at 70°C; etch in 60g / L SurTec495 at 65°C for 2min; in 190ml / LTURCO Liquid at 50°C Pickling in the acidic solution of Smut Go NC for 10 minutes; washing with water, observing the continuous water film on the surface of the aluminum alloy, and then anodizing;

[0043] B aluminum alloy anodized

[0044] Put the pretreated aluminum alloy in the anodic oxidation solution, use lead plate as cathode, sulfuric acid volume ratio 11.5%, tartaric acid 25g / L, oxalic acid 40g / L, aluminum sulfate 3.6g / L. DC superimposed pulse voltage high voltage 20V, low voltage 18V, duty cycle 30%, frequency 30Hz, temperature 15-17°C, oxidation time 40min. Air agitation is performed during the anodizing process.

[0045] After C anodizing, wash with water and dry to obtain aluminum alloy anodic oxidation film.

[0046] The...

Embodiment 3

[0048] A aluminum alloy anodizing pretreatment

[0049] First, degrease the surface of the aluminum alloy parts in a mixed solution of 28g / L sodium carbonate and 30g / L sodium borate at 65°C; etch in 90g / L SurTec495 at 60°C for 3min; in 180ml / L TURCO at 50°C Pickling in the acidic solution of Liquid Smut Go NC for 10 minutes; washing with water, observing the continuous water film on the surface of the aluminum alloy, then anodizing;

[0050] B aluminum alloy anodized

[0051] Put the pretreated aluminum alloy in the anodic oxidation solution, use the lead plate as the cathode, the volume of sulfuric acid is 12.5%, the tartaric acid is 25g / L, the oxalic acid is 40g / L, and the aluminum sulfate is 3.6g / L. DC superimposed pulse voltage high voltage 21V, low voltage 19V, duty cycle 40%, frequency 40Hz, temperature 15-17°C, oxidation time 50min. Air agitation during the anodizing process;

[0052] After C anodizing, wash with water and dry to obtain aluminum alloy anodic oxidation ...

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Abstract

The embodiment of the invention discloses a method for preparing an aluminum alloy anode oxide film by direct-current superposition pulse voltage, which comprises the following steps: aluminum alloy anodization pretreatment: after observing the aluminum alloy surface water film is continuous, carrying out anodization; aluminum alloy anodization: carrying out aluminum alloy anodization by direct-current superposition pulse voltage by using 7-14 vol% sulfuric acid in 25 g / L tartaric acid, 40 g / L oxalic acid and 3.6 g / L aluminum sulfate, wherein in the anodization process, air is used for stirring, the temperature is 15-17 DEG C, the oxidation time is 40-50 minutes, the thickness of the aluminum alloy anode oxide film is controlled by the concentration of the sulfuric acid, and the corrosion resistance and wear resistance are controlled by the oxidation voltage; and after the anodization is finished, washing with water, and drying to obtain the aluminum alloy anode oxide film. By adopting the direct-current superposition pulse power source, the anodization can be carried out at normal temperature, and the obtained oxide film has the advantages of high hardness, favorable wear resistance, high density and short oxidation time.

Description

technical field [0001] The invention belongs to the anodic oxidation technology of DC superimposed pulse power supply, in particular to a method for preparing aluminum alloy anodized film by adopting DC superimposed pulse voltage. Background technique [0002] Aluminum alloys are widely used in aviation and automation fields due to their advantages such as low specific gravity, good machinability, and high strength ratio, but their low hardness, poor wear resistance and corrosion resistance limit their application in industrial fields . Therefore, it is necessary to adopt suitable surface treatment methods to improve the application of aluminum alloy materials in the fields of aviation and automation. Anodizing, laser surface alloying, electroplating and heat treatment and other surface modification technologies can be used to improve the wear resistance and corrosion resistance of aluminum and aluminum alloys. Anodizing aluminum alloys can obtain porous anodized films and ...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/16C25D5/18
Inventor 卫国英赵茜茜余云丹霍斯特·戴庭格
Owner CHINA JILIANG UNIV