Preparation method for metal ceramic composite coating on surface of aluminum alloy

A metal-ceramic composite and aluminum alloy surface technology, applied in the direction of anodic oxidation, etc., can solve the problems of large transition layer size, poor bonding force, and high porosity of titanium alloy micro-arc oxidation coating, and achieve premature peeling and high damage. The effect of high density and high bonding strength

Inactive Publication Date: 2012-07-04
SHENYANG LIGONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a ceramic coating, it also has high porosity and poor toughness, and the transition layer of titanium alloy micro-arc oxidation coating has a large size, obvious interface, and poor bonding force.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a metal-ceramic composite coating on the surface of an aluminum alloy, specifically comprising the following process steps:

[0029] (1) Use 600-mesh sandpaper to polish the surface of aluminum alloy parts to remove defects such as protrusions on the surface to ensure the accuracy of the treated surface;

[0030] (2) Use alcohol to clean the surface of the titanium alloy parts treated in (1) for 15 minutes to remove oil stains, impurities, etc.;

[0031] (3) Select ADC12 aluminum alloy plate, use sodium tungstate (2g / L)-sodium silicate (40g / L) electrolyte, the processing parameters are: the maximum positive constant voltage is 400V, and the maximum negative voltage is 300V , current density 5A / dm 2 , pulse width 1000μs, pulse interval 2000μs, temperature 25°C, prepared Al2O3 ceramic coating;

[0032] (4) grinding by sandpaper to remove the loose layer obtained through step (3) of the micro-arc oxidation ceramic coating;

[0033] (5) Using high-...

Embodiment 2

[0035] A method for preparing a metal-ceramic composite coating on the surface of an aluminum alloy, specifically comprising the following process steps:

[0036] (1) Use 600-mesh sandpaper to polish the surface of aluminum alloy parts to remove defects such as protrusions on the surface to ensure the accuracy of the treated surface;

[0037] (2) Use 90-100°C hot alkali solution to clean the surface of the titanium alloy parts treated in (1) for 20 minutes to remove oil stains and impurities;

[0038] (3) Select ADC12 aluminum alloy plate, use sodium tungstate (2g / L)-sodium silicate (40g / L) electrolyte, the processing parameters are: the maximum positive constant voltage is 600V, and the maximum negative voltage is 100V , current density 1A / dm 2 , pulse width 10000μs, pulse interval 300μs, temperature 25°C, prepared Al2O3 ceramic coating;

[0039] (4) by mechanical polishing, to remove the loose layer obtained through the step (3) of the micro-arc oxidation ceramic coating; ...

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Abstract

The invention discloses a metal ceramic film obtained from the surface of the aluminum alloy and a preparation method thereof. The preparation method of the film includes the steps: polishing an aluminum alloy surface, removing impurities of greasy dirt, dust and the like on the surface, conducting microarc oxidation treatment to the surface of the aluminum alloy; and then adopting a high current pulse electron beam to conduct of bombardment processing on the microarc oxidation surface for a plurality of times to prepare the metal ceramic reinforcing film. The preparation method can prepare a high-hardness abrasion-resistant coating on the surface of the aluminum alloy, can greatly improve combination strength of the coating by introducing a metal phase from a base body, improves toughness of ceramic layers, and obtains a metal ceramic coating with good mechanical property.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and relates to an aluminum alloy surface coating strengthening treatment, in particular to a preparation method of a cermet composite coating on an aluminum alloy surface. Background technique [0002] Aluminum alloy has excellent properties such as low density, high specific strength, excellent electrical and thermal conductivity, corrosion resistance, good plasticity and formability, easy processing, and no low-temperature brittleness. It has become the second largest aluminum alloy after steel in terms of applicability. metallic material. Aluminum alloy materials have been widely used in almost all industrial fields such as construction, aviation, military, automobile, navigation, and medical treatment. [0003] However, the low hardness, wear resistance and poor abrasion resistance of aluminum alloy directly limit its application as a friction pair; and its negative corrosion poten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/06
Inventor 赵晖
Owner SHENYANG LIGONG UNIV
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