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Additive, solution and technology used for hard anodic oxidation of high-silicon aluminum alloy

A hard anodic oxidation, high-silicon aluminum alloy technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., to achieve the effect of reducing cell voltage, improving appearance quality, and avoiding ablation

Inactive Publication Date: 2009-11-11
嘉兴中科亚美合金技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention is to provide a solution for hard anodizing of high-silicon aluminum alloys. A certain amount of additives are added to the sulfuric acid solution, which can effectively avoid the occurrence of ablation and overcome the need in the existing process. Dealing with processing issues at low temperatures of -10-0°C

Method used

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  • Additive, solution and technology used for hard anodic oxidation of high-silicon aluminum alloy
  • Additive, solution and technology used for hard anodic oxidation of high-silicon aluminum alloy
  • Additive, solution and technology used for hard anodic oxidation of high-silicon aluminum alloy

Examples

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Effect test

Embodiment 1

[0063] Embodiment 1 is to the hard anodic oxidation of automobile air-conditioning compressor parts-planet disc

[0064] The product is an A3 56 aluminum alloy with a Si content of 6.5-7.5% and an area of ​​1.8dm 2 .

[0065] This product is installed in the car air-conditioning compressor and works under the conditions of high temperature, high pressure and frequent dynamic friction. The specific technical requirements for processing are: the oxide film is uniform, the thickness is 20-25μm, the microhardness of the film layer is 400-500Hv, and the wear amount of the TABER test is less than 20mg.

[0066] Each liter of hard anodizing solution contains: 180g of sulfuric acid, 20g of oxalic acid, 15g of citric acid and 5g of polyethylene glycol (PEG200).

[0067] The process flow is: degreasing at 55°C for 10 minutes—water washing—pickling for 60 seconds—water washing—hard anodizing current density 3A / dm 2 , 10°C, 40min——water washing——90°C sealing for 10min——100°C drying for...

Embodiment 2

[0071] Embodiment 2 is to the hard anodic oxidation of automobile air-conditioning compressor parts-piston

[0072] The product is ZL102 aluminum alloy with Si content of 10-13%, with an area of ​​0.16dm 2 .

[0073] This product is installed in the compressor of automobile air conditioner and works under the conditions of high temperature, high pressure and frequent dynamic friction. The specific technical requirements for processing are: the oxide film is uniform, the thickness is 30-40um, the microhardness of the film layer is >350Hv, and the wear amount of the TABER test is <20mg.

[0074] Each liter of hard anodizing solution contains: 200g of sulfuric acid, 25g of oxalic acid, 15g of citric acid and 8g of polyethylene glycol (PEG200).

[0075] The process flow is: degreasing at 55°C for 10 minutes—water washing—pickling for 60 seconds—water washing—hard anodizing current density 4A / dm 2 , 10°C, 50min——water washing——90°C sealing for 10min——100°C drying for 10min.

[...

Embodiment 3

[0079] Embodiment 3 is to the hard anodic oxidation of automobile air-conditioning compressor parts - scroll

[0080] The product is an AC8A aluminum alloy with a Si content of 11-13% and an area of ​​3.6dm 2 .

[0081] This product is installed in the compressor of automobile air conditioner and works under the conditions of high temperature, high pressure and frequent dynamic friction. The specific technical requirements for processing are: the oxide film is uniform, the thickness is 10-20μm, the microhardness of the film layer is >350Hv, and the wear amount of the TABER test is <20mg.

[0082] Each liter of hard anodizing solution contains: 200g of sulfuric acid, 25g of oxalic acid, 20g of citric acid and 10g of polyethylene glycol (PEG400).

[0083] The process flow is: degreasing at 55°C for 10 minutes—water washing—pickling for 40 seconds—water washing—hard anodizing 3A / dm 2 , 10°C, 25min——water washing——90°C sealing for 15min——100°C drying for 20min.

[0084] The we...

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Abstract

The invention discloses an additive used for hard anodic oxidation of high-silicon aluminum alloy, with 10g-55g of polybasic organic acid and 0-200g of polylol in each litre of aqueous solution. The additive can lead the dissolution rate of the anode oxide film to be reduced, obviously improve the surface current distribution situation of high-silicon aluminum alloy products, and avoid ablation caused by the over intensive surface current distribution of the products, is beneficial to forming even and complete anode oxide film on the surface and improving the film forming speed and film hardness, avoids the occurrence of the ablation phenomenon, and can further improve the upper limit value of the oxidizing temperature and avoid low-temperature operations, thus simplifying the operation, saving the energy, reducing the cost and leading the film quality to be obviously improved.

Description

technical field [0001] The invention relates to an additive for hard anodic oxidation, in particular to an additive for hard anodic oxidation of high-silicon aluminum alloys, and a high-silicon aluminum alloy hard anodic oxidation solution and a high-silicon aluminum alloy hard anode using the additive oxidation process. Background technique [0002] High-silicon aluminum alloy has been widely concerned because of its easy die-casting formability, good fluidity, excellent machinability and comprehensive mechanical properties. At present, the aluminum alloy die-casting process has become one of the most widely used processes in the aluminum alloy forming process for automobiles, accounting for 49% of the various automobile forming process methods. With the gradual expansion of the application range of die-casting aluminum alloys, surface treatment has become one of the key links in the production and application of aluminum die-casting products. my country's advanced surfac...

Claims

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Application Information

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IPC IPC(8): C25D11/10C25D11/16C25D11/18
Inventor 卫中领沈钰刘兵陈秋荣
Owner 嘉兴中科亚美合金技术有限责任公司
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