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A kind of shielding method before anodic oxidation of aluminum and aluminum alloy sink hole

An aluminum alloy, hole anode technology, applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of easy falling off, affecting product anode quality and production efficiency, to ensure anode quality and improve product production efficiency. Effect

Active Publication Date: 2022-02-18
芜湖通潮精密机械股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CVD-related products are currently made of aluminum and aluminum alloy products. During the production and regeneration process, not all areas require anodes. Some areas need to be energized, and must be shielded before the anode. One of the products has a sink hole. There is no need for anodic coating, but it must be coated around. The traditional method is difficult to deal with. At present, the covered area is soaked in water or electrolyte for a long time, and then washed by a 20MPa high-pressure water gun, it is easy to fall off, and some directly seal the hole. As a result, the anode film cannot be produced on the hole wall. The repair rate of this kind of hole is 100%, which seriously affects the quality of the anode and the production efficiency of the product.

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  • A kind of shielding method before anodic oxidation of aluminum and aluminum alloy sink hole

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Embodiment 1

[0027] A method for shielding aluminum and aluminum alloy sinkholes before anodic oxidation, comprising the following steps:

[0028] 1. First use a degreasing agent with a concentration (mass fraction) of 3.5% and a temperature of 60°C in the area to be shielded (the area on the bottom of the sinkhole) (the mass percentage of sodium tetraborate is 75%, and the proportion of pentasodium triphosphate is 75%. The mass percentage is 10%) solution was washed for 3 minutes.

[0029] 2. Use a sodium hydroxide solution with a concentration (mass fraction) of 1.2% and a temperature of 30°C to peel off the cleaned area for 8 minutes, and then clean it with pure water.

[0030] 3. Neutralize the stripped area in a nitric acid solution with a concentration (mass fraction) of 22% and a temperature of 35°C for 8 minutes. After neutralization, use pure water to clean it, and finally use compressed air to dry it.

[0031] 4. Within 30 minutes after drying, use water-resistant sandpaper 180#...

Embodiment 2

[0039] A method for shielding aluminum and aluminum alloy sinkholes before anodic oxidation, comprising the following steps:

[0040] 1. First use a degreasing agent with a concentration (mass fraction) of 3.5% and a temperature of 60°C in the area to be shielded (the area on the bottom of the sinkhole) (the mass percentage of sodium tetraborate is 75%, and the proportion of pentasodium triphosphate is 75%. The mass percentage is 10%) solution was washed for 3 minutes.

[0041] 2. Use a sodium hydroxide solution with a concentration (mass fraction) of 1.2% and a temperature of 30°C to peel off the cleaned area for 8 minutes, and then clean it with pure water.

[0042] 3. Neutralize the stripped area in a nitric acid solution with a concentration (mass fraction) of 22% and a temperature of 35°C for 8 minutes. After neutralization, use pure water to clean it, and finally use compressed air to dry it.

[0043] 4. Within 30 minutes after drying, use water-resistant sandpaper 180#...

Embodiment 3

[0049] A method for shielding aluminum and aluminum alloy sinkholes before anodic oxidation, comprising the following steps:

[0050]1. First, use a degreasing agent with a concentration (mass fraction) of 3.5% and a temperature of 60°C in the area to be shielded (the area on the bottom of the sinkhole) (the mass percentage of sodium tetraborate is 75%, and the proportion of pentasodium triphosphate The mass percentage is 10%)) solution for cleaning for 3min.

[0051] 2. Use a sodium hydroxide solution with a concentration (mass fraction) of 1.2% and a temperature of 30°C to peel off the cleaned area for 8 minutes, and then clean it with pure water.

[0052] 3. Neutralize the stripped area in a nitric acid solution with a concentration (mass fraction) of 22% and a temperature of 35°C for 8 minutes. After neutralization, use pure water to clean it, and finally use compressed air to dry it.

[0053] 4. Within 30 minutes after drying, use water-resistant sandpaper 180#, 240# to ...

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Abstract

The invention discloses a method for shielding aluminum and aluminum alloy sinkholes before anodic oxidation. The method is to sequentially perform degreasing, alkali washing, primary water washing, pickling, secondary water washing and drying on the area of ​​the sinkhole to be covered. , and then grind the bottom surface and side wall of the sinkhole, then stick tape on the bottom surface of the sinkhole, and finally apply sealing and anti-corrosion glue to complete the masking. The invention solves the shielding problem of the sink hole through the double sealing of solid glue and liquid glue, and will not fall off after being soaked in water, acid, alkali and other liquids for 24 hours, and will not fall off after being washed with a 20MPa high-pressure water gun for 10 minutes, which not only ensures The quality of the anode is improved, and the repair rate is also reduced to 0, which greatly improves the production efficiency of the product.

Description

technical field [0001] The invention belongs to the technical field of shielding of aluminum and aluminum alloy products, and in particular relates to a shielding method before anodic oxidation of sinkholes of aluminum and aluminum alloys. Background technique [0002] In order to overcome the defects of aluminum alloy surface hardness, wear resistance, etc., and prolong the service life, surface treatment technology has become an indispensable part in the use of aluminum alloys, and anodic oxidation technology is currently the most widely used and most successful. Under the corresponding electrolyte and specific process conditions, aluminum and its alloys form a layer of oxide film on the aluminum products due to the action of the applied current, that is, the current products must be soaked in a specific solution for a period of time. [0003] CVD-related products are currently made of aluminum and aluminum alloy products. During the production and regeneration process, no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16
CPCC25D11/022C25D11/16
Inventor 张宽杨彬
Owner 芜湖通潮精密机械股份有限公司