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Preparation method of cast aluminum matrix composite surface army green micro-arc oxidation film

A composite material and micro-arc oxidation technology, which is applied in anodic oxidation, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of poor camouflage effect, achieve good camouflage effect, improve surface roughness, and reduce micro-cracks

Inactive Publication Date: 2017-05-31
SHANXI PINGYANG IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of poor camouflage effect and poor corrosion resistance, hardness, and roughness in the preparation of the green film on the surface of the existing cast aluminum-based composite material, the present invention provides a military-green micro-arc oxidation film on the surface of the cast aluminum-based composite material. Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing a military-green micro-arc oxidation film on the surface of a cast aluminum-based composite material. The following steps are used: a. Use water sandpaper to polish the surface of a cast aluminum-based composite material workpiece and then put it into a water washing tank for cleaning; b. After deionization Add NaOH 2g / L, NiSO 4 2g / L, Na 2 SiO 3 8g / L, (NaPO3) 6 10g / L, Na 2 WO 4 5g / L, EDTA 3 g / L, the PH value of the prepared solution is 8, stir until fully dissolved; c, put the cast aluminum matrix composite material workpiece into the solution, connect the workpiece to the anode, and connect the stainless steel plate of the solution tank After the cathode, turn on the micro-arc oxidation power supply and set the power supply parameters: duty cycle 10%, power frequency 1000Hz, positive and negative pulse ratio 5:1, oxidation voltage 500V, current density 15A / dm 2 , the working temperature is 35°C, and the power supply method is step power s...

Embodiment 2

[0027] A method for preparing a military-green micro-arc oxidation film on the surface of a cast aluminum-based composite material. The following steps are used: a. Use water sandpaper to polish the surface of a cast aluminum-based composite material workpiece and then put it into a water washing tank for cleaning; b. After deionization Add NaOH 3.7g / L, NiSO 4 2.3g / L, Na 2 SiO 3 13g / L, (NaPO3) 6 11g / L, Na 2 WO 48g / L, EDTA 3.5g / L, the pH value of the prepared solution is 9.8, stir until fully dissolved; c, put the cast aluminum matrix composite material workpiece into the solution, connect the workpiece to the anode, and connect the stainless steel plate of the solution tank After the cathode, turn on the micro-arc oxidation power supply and set the power supply parameters: duty cycle 5%, power frequency 938Hz, positive and negative pulse ratio 5:1, oxidation voltage 600V, current density 10A / dm 2 , the working temperature is 39°C, and the power supply method is step pow...

Embodiment 3

[0033] A method for preparing a military-green micro-arc oxidation film on the surface of a cast aluminum-based composite material. The following steps are used: a. Use water sandpaper to polish the surface of a cast aluminum-based composite material workpiece and then put it into a water washing tank for cleaning; b. After deionization Add NaOH 4g / L, NiSO 4 4g / L, Na 2 SiO 3 15g / L, (NaPO3) 6 15g / L, Na 2 WO 4 10g / L, EDTA 8 g / L, the PH value of the prepared solution is 11, stir until fully dissolved; c, put the cast aluminum matrix composite material workpiece into the solution, connect the workpiece to the anode, and connect the stainless steel plate of the solution tank After the cathode, turn on the micro-arc oxidation power supply and set the power supply parameters: duty cycle 8%, power frequency 1000Hz, positive and negative pulse ratio 5:1, oxidation voltage 547V, current density 12A / dm 2 , the working temperature is 45°C, and the power supply method is step power ...

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Abstract

The invention particularly discloses a preparation method of a cast aluminum matrix composite surface army green micro-arc oxidation film. The problems that an existing prepared cast aluminum matrix composite surface army green micro-arc oxidation film is poor in camouflage effect and poor in corrosion resistance, hardness and roughness are solved. The method comprises the steps that a, the surface of a workpiece is ground and cleaned; b, in per liter of deionized water, 2-4 g of NaON, 2-4 g of NiSO4, 8-15 g of Na2SiO3, 10-15 g of (NaPO3)6, 5-10 g of Na2WO4 and 3-8 g of EDTA are added and stirred to be sufficiently dissolved; c, the workpiece is placed into the solution, a micro-arc oxidation power source is turned on, and power source parameters are set; d, the power source is turned off after oxidization is carried out for 20-30 min; and e, the workpiece is thoroughly cleaned and dried. The compactness of the oxidation film is further improved, and meanwhile the film layer hardness reaches up to HV1500-2200.

Description

technical field [0001] The invention relates to a surface treatment technology for cast aluminum-based composite materials, in particular to a method for preparing a military-green micro-arc oxidation film on the surface of cast aluminum-based composite materials. Background technique [0002] The outer casing of the underwater weapon product is made of cast aluminum matrix composite material. In order to improve the combat concealment and improve the comprehensive performance of the surface of the cast aluminum matrix composite material shell such as corrosion resistance, insulation, wear resistance, etc., the design requires the surface to be Army green micro-arc oxidation also puts forward higher requirements on film hardness, corrosion resistance, insulation, bonding strength and other properties. [0003] Micro-arc oxidation (MAO, Micro-arc oxidation), also known as "micro-plasma oxidation", "anodic spark precipitation", "spark discharge anodic oxidation". It can direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14C25D11/06C25D11/16
CPCC25D11/024C25D11/026C25D11/06C25D11/14C25D11/16
Inventor 张海荣原增民赵云成师艳丽郝亚楠
Owner SHANXI PINGYANG IND MACHINERY
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