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A method for anodizing the surface of cast aluminum

A technology of anodizing and processing methods, applied in the direction of anodizing, surface reaction electrolytic coating, coating, etc., can solve the problems of complicated process and high cost of casting aluminum surface treatment, and achieve the effect of smooth and uniform surface, full and bright color

Active Publication Date: 2022-02-15
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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  • A method for anodizing the surface of cast aluminum
  • A method for anodizing the surface of cast aluminum

Examples

Experimental program
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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 surface processing of cast aluminum and belongs to the field of mechanical processing. A method for anodizing the surface of cast aluminum. The method combines chemical corrosion and magnetic fluid grinding technology. First, the surface of cast aluminum is treated by simple chemical corrosion, and then the surface is subjected to sandblasting and then magnetic fluid grinding. This process overcomes the In the past, the anodic oxidation of the surface of cast aluminum required repeated improvement of the corrosion process, the control of the corrosion rate and depth, and the complex processing technology problems of minimizing the local deep corrosion of the cast aluminum surface. The corrosion resistance of the cast aluminum surface treated by this process is comparable to that of the commercially purchased cast aluminum surface treated with a silica fume removal agent, which can resist long-term corrosion in a strong acid environment for more than 96 hours, and the cast aluminum surface treated by this process is smooth and uniform, and the color is full and gorgeous , not only has the matte texture brought by microscopic frosting, but also has the overall bright feeling of light reflection.

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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Patent Type & Authority Patents(China)
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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