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Preparation method for brown micro arc oxidation film of surface of casting aluminum base composite material

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 low bonding strength, low insulation resistance, and poor corrosion resistance, and achieve increased hardness, improved roughness, uniform color effect

Inactive Publication Date: 2017-05-24
SHANXI PINGYANG IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of applicability, poor corrosion resistance and low hardness, corrosion resistance, bonding strength and insulation resistance of the micro-arc oxidation film on the surface of the existing cast aluminum-based composite material, the present invention provides a cast aluminum-based composite Preparation method of brown micro-arc oxidation film on material surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a brown 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. Wash it in deionized water Add NaOH 2g / L, CuSO 4 1g / L, Na 2 SiO 3 8g / L, (NaPO3) 6 10g / L, Na 2 WO 4 5g / L, EDTA 3g / 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 to the cathode Finally, 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 powe...

Embodiment 2

[0026] A method for preparing a brown 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. Wash it in deionized water Add NaOH 3.7g / L, CuSO 4 1.3g / L, Na 2 SiO 3 13g / L, (NaPO3) 6 11g / L, Na 2 WO 4 8g / 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

[0032] A method for preparing a brown 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. Wash it in deionized water Add NaOH 4g / L, CuSO 4 2g / 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 s...

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Abstract

The invention provides a preparation method for a brown micro arc oxidation film of the surface of a casting aluminum base composite material. According to the preparation method for the brown micro arc oxidation film of the surface of the casting aluminum base composite material, the problem that an existing prepared brown micro arc oxidation film of the surface of the casting aluminum base composite material is poor in corrosion resistance, hardness and roughness is solved. The preparation method comprises the following steps that (a), the surface of a workpiece is washed after being polished; (b), 2-4 g / L of NaOH, 1-2 g / L of CuSO4, 8-15 g / L of Na2SiO3, 10-15 g / L of (NaPO3) 6, 5-10 g / L of Na2WO4 and 3-8 g / L of EDTA are added into deionized water and stirred till ample dissolution is achieved; (c), the workpiece is stored into a solution, a micro arc oxidation power source is opened, and power source parameters are set; (d), after oxidation is conducted for 20-30 min, the power source is closed; and (e), the workpiece is completely washed and dried in air. According to the preparation method for the brown micro arc oxidation film of the surface of the casting aluminum base composite material, compactness of the oxidation film is further improved, and meanwhile, the hardness of a film layer reaches up to HV 1500-2200.

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 brown micro-arc oxidation film on the surface of cast aluminum-based composite materials. Background technique [0002] Micro-arc oxidation (MAO, Micro-arc oxidation), also known as "micro-plasma oxidation", "anodic spark precipitation", "spark discharge anodic oxidation". It can directly grow ceramic film layer on the surface of valve metal (Mg, Al, Ti, Zr, Nb) in situ, so as to achieve the surface strengthening of the workpiece, the hardness is greatly improved, and the properties of wear resistance, corrosion resistance, insulation and high temperature thermal shock resistance are improved. the goal of. [0003] Micro-arc oxidation is developed on the basis of traditional anodic oxidation, and its essence is a process of instantaneous breakdown of ceramic film. From the initial "electronic avalanche" model,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/14
CPCC25D11/024C25D11/026C25D11/06C25D11/14
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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