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Solution for deashing and processing surface of silicon aluminum composite material

A silicon-aluminum composite material and a technology for treating solutions, which are applied in the field of metal surface treatment, can solve problems such as easy bulging, incompleteness, and falling off, and achieve the effects of stable process quality, uniform and dense surface, and improved adhesion

Inactive Publication Date: 2015-04-29
南京驰韵科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional aluminum alloy deashing solutions are difficult to completely remove the ash film on the surface of silicon-aluminum composite materials, and physical methods such as mechanical brushing or ultrasonic cleaning are often required to assist removal.
These methods are not only inefficient, but also cannot guarantee the complete removal of silicon particles or silicon elements, and even uneven cleaning (micro-corrosion occurs when local cleaning is excessive, while silicon particles are still attached to the surface of other parts)
The uneven and incomplete cleaning of the dust-hanging film layer of the silicon-aluminum composite material often leads to quality problems such as the final coating surface is not dense enough, easy to bulge, fall off, etc.

Method used

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  • Solution for deashing and processing surface of silicon aluminum composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare the ash-removing solution for silicon-aluminum composite materials according to the following components:

[0018] Ammonium fluoride: 300g / L;

[0019] Lactic acid: 5g / L;

[0020] Oxalic acid: 10g / L;

[0021] Citric acid: 5g / L.

[0022] The silicon-aluminum composite material with a silicon content of 80% was used as the experimental sample. Firstly, after the prepared silicon-aluminum composite material sample is degreasing and rinsed with water, etc., the sample is immersed in a strong acid solution to remove the aluminum alloy oxide film. There is a black loose film layer on the surface of the sample, and the sample is placed on the above-mentioned silicon-aluminum composite material to remove the oxide film. In the ash solution, the temperature is room temperature. After 30s, the sample is taken out and rinsed with clean water to obtain a clean surface that removes the aluminum alloy’s own oxide film and floating ash on the surface. Then, the surface is tr...

Embodiment 2

[0024] Prepare the ash-removing solution for silicon-aluminum composite materials according to the following components:

[0025] Ammonium fluoride: 30g / L;

[0026] Lactic acid: 100g / L;

[0027] Oxalic acid: 300g / L;

[0028] Citric acid: 5g / L.

[0029] The silicon-aluminum composite material with a silicon content of 10% was used as the experimental sample. Firstly, after the prepared silicon-aluminum composite material sample is degreasing and rinsed with water, etc., the sample is immersed in a strong acid solution to remove the aluminum alloy oxide film. There is a black loose film layer on the surface of the sample, and the sample is placed on the above-mentioned silicon-aluminum composite material to remove the oxide film. In the ash solution, the temperature is room temperature. After 30s, the sample is taken out and rinsed with clean water to obtain a clean surface with the aluminum alloy’s own oxide film and surface floating ash removed. Then, the surface is treated...

Embodiment 3

[0031] Prepare the ash-removing solution for silicon-aluminum composite materials according to the following components:

[0032] Ammonium fluoride: 100g / L;

[0033] Lactic acid: 20g / L;

[0034] Oxalic acid: 100g / L;

[0035] Citric acid: 20g / L.

[0036] The silicon-aluminum composite material with a silicon content of 30% was used as the experimental sample. Firstly, after the prepared silicon-aluminum composite material sample is degreasing and rinsed with water, etc., the sample is immersed in a strong acid solution to remove the aluminum alloy oxide film. There is a black loose film layer on the surface of the sample, and the sample is placed on the above-mentioned silicon-aluminum composite material to remove the oxide film. In the ash solution, the temperature is room temperature. After 30s, the sample is taken out and rinsed with clean water to obtain a clean surface with the aluminum alloy’s self-oxidized film and surface floating dust removed, and then hang-coated w...

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Abstract

The invention discloses a solution for deashing and processing the surface of a silicon aluminum composite material and belongs to the technical field of metal surface treatment. The solution consists of 30-300 g / L of fluoride, 5-100 g / L of lactic acid, 10-300 g / L of oxalic acid and 5-100 g / L of citric acid; the silicon content in the silicon aluminum composite material is 10-80 percent. A preparation method of the solution comprises, but not limited to the following steps: powder metallurgy and injection molding; the fluoride is more than one of ammonium fluoride, sodium fluoride and potassium bifluoride. According to the solution disclosed by the invention, an ash hanging film on the surface of the silicon aluminum composite material can be quickly and effectively removed, the negative effect of silicon particles on the surface of the silicon aluminum composite material is avoided, the adhesive force of a coating layer is greatly improved, and the surface of the coating layer is guaranteed to be uniform and compact and be free from bump, falling-off and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a treatment solution for removing ash on the surface of a silicon-aluminum composite material. Background technique [0002] Si / Al composite material, in addition to the excellent properties of ordinary aluminum alloys, also has a controllable linear expansion coefficient, and is one of the ideal electronic packaging materials. In order to improve the conductivity, welding and sealing requirements of silicon-aluminum composite materials, it is necessary to carry out surface coating treatment on silicon-aluminum composite materials, such as electroplating, chemical plating, anodic oxidation, coating and so on. [0003] A thin and dense oxide film is easily formed on the surface of aluminum and aluminum alloys. The existence of the oxide film seriously affects the bonding strength between the surface coating and the substrate, and affects the compactness...

Claims

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Application Information

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IPC IPC(8): C23G1/12C23G1/02
CPCC23G1/125
Inventor 赵月红刘彦强郝心想肖雪婷樊建中马自力聂俊峰魏少华
Owner 南京驰韵科技发展有限公司
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