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Micro-arc oxidation ceramic coating on aluminium alloy surface without tectorium and method for preparing same

A micro-arc oxidation technology for the surface of aluminum alloys, applied in the direction of anodic oxidation, etc., can solve the problems of destroying the microscopic surface structure of the dense layer, hindering the application process of the micro-arc oxidation technology by the loose layer of the surface layer, reducing the wear resistance of the film layer, etc., achieving The effect of inhibiting excessive growth

Inactive Publication Date: 2006-10-11
狄士春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Removing the loose layer not only increases the complexity of the process, but also brings a series of problems, such as: the removal process of the loose layer on the surface of parts with complex shapes, the removal of the loose layer destroys the oil storage capacity of the pores on the surface of the membrane layer, reducing Improve the wear resistance of the film layer, destroy the microscopic surface structure of the dense layer, etc.
Therefore, the existence of the surface loose layer of the conventional three-layer micro-arc oxidation film seriously hinders the actual engineering application process of the micro-arc oxidation technology.

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  • Micro-arc oxidation ceramic coating on aluminium alloy surface without tectorium and method for preparing same
  • Micro-arc oxidation ceramic coating on aluminium alloy surface without tectorium and method for preparing same

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specific Embodiment approach 1

[0010] Specific Embodiment 1: The micro-arc oxidation ceramic film without a loose layer on the aluminum alloy surface in this embodiment is composed of a dense layer 1-2 and a transition layer 1-3, wherein the transition layer 1-2 accounts for 1 / 5 of the total film thickness ~1 / 3.

[0011] In this embodiment, the total thickness of the micro-arc oxidation film layer is 30-300 μm; the thickness of the transition layer 1-2 is preferably 10-50 μm.

[0012] If the process control is not strict, there will be 1 to 10 μm of adsorbed substances on the surface of the dense layer. This adsorbed substance layer is different from the loose layer of the conventional three-layer structure micro-arc oxidation film layer, accounting for 1 / 5 to 1 / 5 of the entire film thickness. 1 / 2, its thickness is generally an order of magnitude smaller than the thickness of the entire film layer.

specific Embodiment approach 2

[0013] Embodiment 2: In this embodiment, the aluminum alloy workpiece undergoes the following processes in sequence: cleaning→micro-arc oxidation treatment→cleaning→sealing→drying→detection. Among them, the micro-arc oxidation treatment process is carried out according to the following process steps: the aluminum alloy workpiece is placed in the stainless steel tank containing the working fluid, the workpiece is used as the anode, the stainless steel tank is used as the cathode, and the positive and negative bipolar pulse power supply is used to provide electric energy. Control the forward voltage to 500-700V, the negative voltage to 40-180V, and the current density to 0.2-15A / dm 2 , the treatment time is 30-150min, and the treatment temperature is not higher than 35°C.

[0014] In this embodiment, the pH of the working fluid is 5-12. The working fluid contains inorganic salts and / or organic salts, and a mixture of one or more of manganese oxide, magnesium oxide, iron oxide, ...

specific Embodiment approach 3

[0016] Specific implementation method three: Specimen material: LY12, size: Φ30×5mm disc, working fluid ratio: 0.5g / L sodium silicate, 5g / L sodium borate, 5g / L sodium aluminate, 1.25g / L Potassium hydroxide and 0.5g / L manganese dioxide, the final forward voltage is set to 550V, the negative voltage is set to 50V, and the current density is set to 8A / dm 2 , the temperature is controlled within 30°C, and the processing is stopped for 60 minutes. The film thickness on the surface of the specimen is 65-71 μm, of which the dense layer is 47-53 μm, and the rest is a transition layer. For adsorbed substances of 5 μm, the surface roughness Ra=0.8~3.0.

[0017] Specific implementation method 4: Test piece material: LF3, size: 50×50mm piece, working fluid ratio: 5g / L ammonium carbonate, 2g / L sodium aluminate, 1.8g / L sodium hydroxide, 3g / L magnesium oxide powder and 2.3g / L selenium oxide powder, the final forward voltage is set to 525V, the negative voltage is set to 85V, and the current...

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Abstract

This invention relates to the micro-arc oxidation ceramic film of the aluminum alloy surface without loose layer and its making method. This invention provides a new two-layer structure film which has only regular transition layer (1-2) and compact layer (1-30, wherein the transition layer (1-2) takes up 1 / 5-1 / 3 of the total film thickness. The dealing method as follows: arranging the aluminum work piece in the stainless steel groove which contains working liquid, and using double polarity impulse power to provide electric power, controlling the positive voltage as 500-700V,negative voltage as 40-180V, current density as 0.2-15A / dm2, and dealing time as 30-150min,wherein the dealing temperature is no higher than 35deg C. This invention can improve the quality of the film surface effectively.

Description

technical field [0001] The invention relates to a micro-arc oxidation ceramic film on the surface of an aluminum alloy and a preparation process thereof. Background technique [0002] Micro-arc oxidation technology (also known as plasma oxidation, anode spark deposition, spark discharge anode deposition and surface ceramicization, etc.) can effectively combine the performance advantages of aluminum and ceramic materials organically with its unique technical advantages. It has greatly expanded the application range of aluminum materials, and has received more and more attention from various industry sectors. With the attention and the expansion of the research team, the application research of micro-arc oxidation technology is developing faster and faster, and it has begun to enter the practical application in some fields. However, the current micro-arc oxidation film layer is a three-layer structure composed of the bottom transition layer, the middle dense layer, and the ou...

Claims

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Application Information

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IPC IPC(8): C25D11/04
Inventor 狄士春潘明强
Owner 狄士春
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