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Method for increasing light alloy micro-arc oxidation coat endurance life

A technology of micro-arc oxidation and fatigue life, applied in the direction of coating, anodic oxidation, surface reaction electrolytic coating, etc., can solve the problem of reduced fatigue life of alloys

Inactive Publication Date: 2008-09-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the fatigue life of the alloy after micro-arc oxidation is significantly reduced while the existing micro-arc oxidation process improves the wear resistance and corrosion resistance of the substrate, a method for improving the fatigue life of the light alloy micro-arc oxidation coating is proposed. Methods

Method used

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  • Method for increasing light alloy micro-arc oxidation coat endurance life
  • Method for increasing light alloy micro-arc oxidation coat endurance life
  • Method for increasing light alloy micro-arc oxidation coat endurance life

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 Describe this embodiment, the steps of this embodiment are as follows:

[0014] Step 1: Substrate pretreatment: Light alloy metal surface 1 is polished and cleaned;

[0015] Step 2: surface nanocrystallization: a nanocrystalline layer 2 with a thickness of 10-20 μm is formed on the metal surface 1 of the light alloy by means of surface nanocrystallization;

[0016] Step 3: Micro-arc oxidation: place the light alloy after surface nanometerization in a stainless steel tank containing alkaline electrolyte, use the light alloy as the anode, and the stainless steel tank as the cathode; through the control of the electrical parameters of the micro-arc oxidation, The metal surface 1 of the light alloy forms a composite coating 4 of a nanocrystalline layer 2 and a micro-arc oxidation layer 3, and the thickness is controlled at 10-20 μm.

[0017] The aforementioned light alloys may be aluminum alloys, titanium alloys and magne...

specific Embodiment approach 2

[0018] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the metal surface 1 is severely plastically deformed by using surface nanotechnology, resulting in a large number of dislocations, twins or sub-grain structures, resulting in the refinement of grains to the nanometer level The vibration frequency of the surface nanometerization is 48Hz, the spray distance is 30mm, the shot diameter is 3-10mm, and the shot blasting time is 15-60min, so as to obtain a nanocrystalline layer 2 with a thickness of 10-20μm; the surface nanometerization adopts high-energy spraying shot method, surface mechanical grinding method or supersonic spraying method. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the energy of the micro-arc oxidation process in step 3 is provided by an adjustable high-voltage and high-frequency bipolar pulse power supply, the pulse voltage is 400-600V, the frequency is 400-800Hz, The duty ratio is 4-20%, and the solution temperature is 0-50°C. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a method for improving the fatigue life of a light alloy micro-arc oxide coating. The invention relates to the metal surface modification technical field and solves the problem in the prior micro-arc oxidation technology that the abrasion resistant performance and the corrosion resistant performance of a matrix are improved and simultaneously the fatigue life of alloys after micro-arc oxidation is obviously reduced. The invention comprises the following steps: firstly, the metal surface of light alloys is grinded, polished and cleaned; secondly, nano crystallization of the surface is performed so as to form a nano crystal layer with the thickness of 10 to 20 micrometers; thirdly, light alloys after nano crystallization of the surface are arranged inside a stainless steel bath body which is provided with alkaline electrolytes, and a composite coating of the nano crystal layer and a micro-arc oxide layer is formed on the metal surface of the light alloys with the thickness of 10 to 20 micrometers through control of micro-arc oxidation electrical parameters. The method obviously improves the fatigue life of the alloys after micro-arc oxidation processing and can expand the application range of the light alloy micro-arc oxide coating under severe conditions of alternation or impact stress and so on.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a preparation process of a composite coating for improving the fatigue life of a light alloy after micro-arc oxidation. Background technique [0002] Titanium and aluminum alloy micro-arc oxidation coatings used on marine ships, aircraft, offshore platforms, and metallurgical and petrochemical equipment have a harsher service environment than civilian industries, and must withstand severe corrosion and alternating or impact loads. Therefore, the coating is required to improve the wear resistance and corrosion resistance of the substrate without significantly reducing the fatigue life of the substrate and improving the service reliability of the material. [0003] At present, the traditional anodizing or hard anodizing process widely used in the field of ocean ships and aviation has serious fatigue damage to the matrix alloy. It has decreased by about 15%, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D11/16C25D11/30
Inventor 王亚明文磊郭立新雷廷权贾德昌周玉
Owner HARBIN INST OF TECH
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