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Micro-arc oxidation method for inner cavity structure

A micro-arc oxidation and inner cavity technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of incapable of oxidation of inner cavity parts, and achieve the effect of low maintenance cost and simple composition.

Inactive Publication Date: 2019-02-22
CHINA SPECIAL TYPE FLIER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Purpose of the present invention: The existing micro-arc oxidation process can only obtain a consistent and continuous oxide film layer on the outer surface of the workpiece, and cannot oxidize the inner cavity parts. For the inner cavity structure, it is necessary to redesign the oxidation tooling and process

Method used

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  • Micro-arc oxidation method for inner cavity structure

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Experimental program
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Effect test

Embodiment 1

[0026] For φ30mm aluminum alloy component 3, design a built-in cathode and open a φ8mm hole on the cathode to ensure the effective area of ​​the cathode scattering on the electric field of aluminum alloy component 3. Turn on the power terminal 1, set reasonable oxidation parameters, and start the aluminum alloy Oxidation of part 3.

[0027] (1) Prepare electrolyte: add 40g / L sodium hexametaphosphate and WH-3 5g / L into purified water and stir until completely dissolved. Then add an appropriate amount of sodium silicate to adjust the Ph to 7-8.

[0028] (2) Prepare aluminum alloy parts 3 with specifications of φ30mm×500mm, degrease and wash with water.

[0029] (3) Process 600mm×20mm×2mm built-in cathode.

[0030] (4) Put the aluminum alloy part 3 into the oxidation tank, insert the built-in cathode into the inner cavity of the aluminum alloy part 3, control the cathode and the inner wall of the aluminum alloy part to leave a certain gap, and connect the cathode and anode.

[0031] (5) ...

Embodiment 2

[0035] According to the oxidized φ35 aluminum alloy part 3 inner cavity workpiece, a built-in cathode is designed, and a φ8mm hole is opened on the cathode to ensure the effective area of ​​the cathode scattering on the electric field of the aluminum alloy part 3, and the power terminal 1 is connected. Set reasonable oxidation parameters to start the oxidation of the aluminum alloy part 3.

[0036] (1) Prepare electrolyte: add 35g / L sodium hexametaphosphate and WH-3 2g / L into purified water and stir until completely dissolved. Then add an appropriate amount of sodium silicate to adjust the Ph to 7-8.

[0037] (2) Prepare aluminum alloy parts 3 with specifications of φ35mm×500mm, degrease and wash with water.

[0038] (3) Process 600mm×25mm×2mm built-in cathode.

[0039] (4) Put the aluminum alloy part 3 into the oxidation tank, insert the built-in cathode into the inner cavity of the aluminum alloy part 3, control the cathode to leave a certain gap with the inner cavity wall of the a...

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Abstract

The invention relates to micro-arc oxidation corrosion prevention for an aluminum alloy inner cavity structure, in particular to a micro-arc oxidation method of the inner cavity structure. The micro-arc oxidation method is characterized in that a built-in oxidation cathode is designed, and the built-in cathode is machined and manufactured according to the size of an inner cavity of an aluminum alloy component subjected to oxidation treatment; the built-in cathode is of a plate-like structure; small holes are formed in the built-in cathode; the built-in cathode is fixed to an oxidation tank; the aluminum alloy component acting as an anode sleeves the built-in cathode; and meanwhile, a circulating pump is adopted to introduce tank liquid into the inner cavity of the aluminum alloy component;and micro-arc oxidation of the inner cavity of the aluminum alloy component is realized through the circulated tank liquid and the built-in cathode. The micro-arc oxidation of an inner cavity workpiece is realized; a continuous and consistent oxide film is obtained from the inner cavity structure; an electrolyte has simple composition and the maintenance cost is low; the electrolyte does not contain environmental restriction elements and is neutral (pH 7.5-8.5), non-toxic and harmless; and daily replacement is not required and green and environmental protection are facilitated.

Description

Technical field [0001] The invention relates to the micro-arc oxidation anti-corrosion of an aluminum alloy inner cavity structure, and more specifically, to a micro-arc oxidation method of the inner cavity structure. Background technique [0002] Aluminum alloy has poor anti-corrosion and wear resistance in the marine environment, which is likely to cause corrosion of the equipment. In order to improve the corrosion resistance and wear resistance of aluminum alloy parts in the marine environment, surface treatment is required. Among them, micro-arc oxidation technology is an effective way to increase the corrosion resistance and surface wear resistance of aluminum alloy materials. [0003] At present, the micro-arc oxidation technology for ordinary flat workpieces is relatively mature. The oxidation prevention method and technology for processing ordinary workpieces is difficult to perform oxidation treatment on workpieces with tubular inner cavity structure. In recent years, scan...

Claims

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Application Information

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IPC IPC(8): C25D11/06
CPCC25D11/026C25D11/06
Inventor 王小龙游加旺尹风雷伍振宙王浩伟廖圣智
Owner CHINA SPECIAL TYPE FLIER RES INST
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