Cast aluminum surface anodic oxidation machining method

A technology of anodizing and processing methods, which is applied in the direction of anodizing, surface reaction electrolytic coating, electrolytic coating, etc., and can solve the problems of complex process and high cost of surface treatment of cast aluminum

Active Publication Date: 2020-10-23
中山市三美高新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for anodizing the surface of cast aluminum to solve the problems of high cost and complicated process of surface treatment of cast aluminum

Method used

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  • Cast aluminum surface anodic oxidation machining method
  • Cast aluminum surface anodic oxidation machining method

Examples

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Effect test

Embodiment 1

[0052] Degrease the cast aluminum surface at 40°C to remove the grease on the cast aluminum surface. Then the treated cast aluminum was placed in 10wt% nitric acid solution at room temperature for acid-base neutralization treatment.

[0053] Then phosphoric acid, nitrate, and ammonium bifluoride are used to configure the chemical etching solution. In this embodiment, the mass ratio of phosphoric acid, nitrate, and ammonium bifluoride is 60wt%:20wt%:5wt%, and the temperature of chemical etching is 20-25°C. The etching time is 30-60 seconds. The surface of the cast aluminum that has been corroded is subjected to sand blasting and then magnetic fluid grinding is performed. In this embodiment, the speed of the sand blasting process is 8 Hz, the swing speed is 28 Hz, and the pressure is 2.0 kg, which is used to remove the surface burrs of the product and remove the casting The silica fume layer on the aluminum surface enhances the surface consistency of the product. In this embod...

Embodiment 2

[0057] Degrease the cast aluminum surface at 50°C to remove the grease on the cast aluminum surface. Then place the treated cast aluminum in 15% nitric acid solution at room temperature for acid-base neutralization.

[0058] Then adopt phosphoric acid, nitrate, ammonium bifluoride to configure chemical etching solution, the mass ratio of phosphoric acid, nitrate, ammonium bifluoride is 70wt%:23wt%:8wt% in the present embodiment, the temperature of chemical etching is 23 ℃ and corrosion time is 30~ 60 seconds. The surface of the cast aluminum that has been corroded is subjected to sand blasting and then magnetic fluid grinding is performed. In this embodiment, the speed of the sand blasting process is 12 Hz, the swing speed is 32 Hz, and the pressure is 3 kg, which is used to remove the surface burrs of the product and deeply remove the cast aluminum The surface silica fume layer enhances the surface consistency of the product. In this embodiment, the abrasive used for magnet...

Embodiment 3

[0062] Degrease the cast aluminum surface at 60°C to remove the grease on the cast aluminum surface. Then the treated cast aluminum was placed in 20wt% nitric acid solution at room temperature for acid-base neutralization treatment.

[0063] Then phosphoric acid, nitrate, and ammonium bifluoride are used to configure the chemical etching solution. In this embodiment, the mass ratio of phosphoric acid, nitrate, and ammonium bifluoride is 80wt%:25wt%:10wt%, and the temperature of chemical etching is 20-25°C. The etching time is 30-60 seconds. The surface of the cast aluminum that has been corroded is subjected to sandblasting treatment and then subjected to magnetic fluid grinding. In this embodiment, the speed of the sandblasting process is 15 Hz, the swing speed is 38 Hz, and the pressure is 3.5 kg. The silica fume layer on the aluminum surface enhances the surface consistency of the product. In this embodiment, the abrasive used for magnetic fluid grinding on the surface is...

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Abstract

The invention relates to cast aluminum surface machining, and belongs to the field of machining. The invention relates to a cast aluminum surface anodic oxidation processing method, which combines chemical corrosion and a magnetic fluid grinding process, firstly adopts simple chemical corrosion to treat the surface of cast aluminum, then performs sand blasting treatment on the surface and then performs magnetic fluid grinding, and the process overcomes the defects that the corrosion process needs to be repeatedly improved in the conventional cast aluminum surface anodic oxidation process; thecorrosion speed and depth are controlled, and the complex machining process problem of local deep corrosion of the cast aluminum surface is solved as much as possible. The surface corrosion resistanceof the cast aluminum treated through the process and the surface corrosion resistance of the cast aluminum treated through a commercially purchased silica fume removal agent can resist long-time corrosion for 96 h or above in a strong acid environment, the surface of the cast aluminum treated through the process is smooth and uniform, the color and luster are full and bright, and the matte texture brought by microscopic frosted sand is achieved; and the light reflection brightness of the whole body is realized.

Description

technical field [0001] The invention relates to metal surface processing, in particular to a casting aluminum surface oxidation processing method. Background technique [0002] Existing cast aluminum is one of the most widely used industrial materials at present, and is widely used in light industry manufacturing, automobile engine manufacturing, aviation equipment integrated cutting and processing production and other processes. For a long time, cast aluminum has not undergone fine surface processing, and has been directly applied in various industrial chains. However, with the gradual promotion of cast aluminum in the light industry, more and more cast aluminum devices require surface refinement treatment, such as corrosion-resistant treatment, surface sandblasting and other processing methods. [0003] Due to the spontaneous formation of aluminum oxide protective film on the surface of aluminum metal, good corrosion resistance can be achieved. Therefore, one of the impo...

Claims

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Application Information

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IPC IPC(8): C25D11/16C25D11/08C23F1/20C23G1/12B24B1/00B24C1/08
CPCC25D11/16C25D11/08C23F1/20C23G1/125B24B1/005B24C1/08
Inventor 张金华李杨科王冠军
Owner 中山市三美高新材料技术有限公司
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