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Two-step cast aluminium alloy micro-arc oxidation treatment method

A technology of cast aluminum alloy and micro-arc oxidation is applied in the field of preparing pre-oxidized film and micro-arc oxidation film on the surface of cast aluminum alloy, which can solve the problems of limited application and promotion, long arc starting time, high current density, etc. The effect of arc starting time, reducing current density and improving production efficiency

Inactive Publication Date: 2014-01-22
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the micro-arc oxidation treatment of die-casting aluminum alloys has problems such as long arc start time, high current density, and high energy consumption, which limits the application and promotion of this technology in the field of industrial production.

Method used

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  • Two-step cast aluminium alloy micro-arc oxidation treatment method
  • Two-step cast aluminium alloy micro-arc oxidation treatment method
  • Two-step cast aluminium alloy micro-arc oxidation treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] (1) Perform pre-oxidation treatment on cast aluminum alloy with Si content of 9wt%. The electrolyte temperature is 15~55℃, and the current density is 1.0~3.0A / dm 2 , the pulse voltage is 150~350V, the pulse frequency is 400Hz, the duty cycle is 10%, and the processing time is 5min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0015] (2) Take out the cast aluminum alloy sample treated in step (1), rinse it with deionized water for 1 min, and dry it at 15~35°C for 30 min;

[0016] (3) The cast aluminum alloy sample treated in step (2) is subjected to micro-arc oxidation treatment. The electrolyte temperature is 25~45℃, and the current density is 0.5~1.0A / dm 2 , the pulse voltage is 200~400V, the pulse frequency is 400Hz, the duty cycle is 20%, and the processing time is 10min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0017] (4) Take out the cast aluminum alloy sample treat...

Embodiment approach 2

[0019] (1) Perform pre-oxidation treatment on cast aluminum alloy with Si content of 18wt%. The electrolyte temperature is 15~55℃, and the current density is 2.0~3.0A / dm 2 , the pulse voltage is 150~350V, the pulse frequency is 400Hz, the duty cycle is 8%, and the processing time is 5min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0020] (2) Take out the cast aluminum alloy sample treated in step (1), rinse it with deionized water for 1 min, and dry it at 15~35°C for 30 min;

[0021] (3) The cast aluminum alloy sample treated in step (2) is subjected to micro-arc oxidation treatment. The electrolyte temperature is 25~45℃, and the current density is 1.0~1.5A / dm 2 , the pulse voltage is 200~400V, the pulse frequency is 600Hz, the duty cycle is 15%, and the processing time is 10min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0022] (4) Take out the cast aluminum alloy sample treat...

Embodiment approach 3

[0024] (1) Perform pre-oxidation treatment on cast aluminum alloy with Si content of 35wt%. The electrolyte temperature is 15~55℃, and the current density is 3.0~5.0A / dm 2 , the pulse voltage is 150~350V, the pulse frequency is 400Hz, the duty cycle is 5%, and the processing time is 10min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0025] (2) Take out the cast aluminum alloy sample treated in step (1), rinse it with deionized water for 1 min, and dry it at 15~35°C for 30 min;

[0026] (3) The cast aluminum alloy sample treated in step (2) is subjected to micro-arc oxidation treatment. The electrolyte temperature is 25~45℃, and the current density is 1.5~2.5A / dm 2 , the pulse voltage is 250~450V, the pulse frequency is 800Hz, the duty cycle is 10%, and the processing time is 20min. The electrolyte formula is: sodium hexametaphosphate 10~50g / L, sodium hydroxide 2~10g / L;

[0027] (4) Take out the cast aluminum alloy sample trea...

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Abstract

The invention provides a two-step cast aluminium alloy micro-arc oxidation treatment method, relates to a preparation method of a micro-arc oxidation film and in particular relates to a method for preparing a pre-oxidation film and a micro-arc oxidation film on the surface of the cast aluminium alloy. The two-step cast aluminium alloy micro-arc oxidation treatment method comprises the following processing steps: (1) placing a cast aluminium alloy sample into electrolyte, and carrying out pre-oxidation treatment; (2) washing and drying the preoxidized cast aluminium alloy sample; (3) placing the dried cast aluminium alloy sample into the electrolyte and carrying out micro-arc oxidation treatment; (4) washing and drying the cast aluminium alloy sample subjected to the micro-arc oxidation treatment. The two-step cast aluminium alloy micro-arc oxidation treatment method has the advantages that the problem that energy consumption is high in a cast aluminium alloy micro-arc oxidation process is solved, power consumption in the cast aluminium alloy micro-arc oxidation treatment is obviously reduced, micro-arc oxidation time is shortened, no pollution to the environment is produced, and significance and practical value are provided in popularization and application of a micro-arc oxidation technology in the field of cast aluminium alloy workpiece surface protection.

Description

technical field [0001] The invention relates to a method for preparing a micro-arc oxidation film, in particular to a method for preparing a pre-oxidation film and a micro-arc oxidation film on the surface of a cast aluminum alloy. Background technique [0002] Die-cast aluminum alloy has the advantages of low density, high specific strength, and easy processing and molding, so it is widely used in aerospace and other defense industries, transportation industries, and marine equipment such as ships and submarines. However, due to the addition of various alloying elements to the aluminum alloy, especially the high-strength cast aluminum alloy containing Si, Cu, Mg and other elements, the corrosion sensitivity is increased, and corrosion and damage may occur in the atmospheric environment, followed by surface hardness. Low and prone to wear and tear. Therefore, for die-cast aluminum alloy parts, effective surface treatment measures must be taken to enhance their corrosion res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12
Inventor 马婕王守超杨院生伊希斌王修春张晶刘硕
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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