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Aluminum alloy surface micro-arc oxidation coating and preparing method thereof

A technology of micro-arc oxidation on the surface of aluminum alloy, applied in the field of electrochemistry, can solve the problems of complex film forming process, reducing the wear resistance of the film layer, affecting the wear resistance of the film layer, etc.

Active Publication Date: 2017-08-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The micro-arc oxidation treatment in electrolytes such as silicates introduces other impurities into the film layer, reducing the wear resistance of the film layer; using another micro-arc oxidation electrolyte, namely aluminate electrolyte, although pure Micro-arc oxidation film of alumina, but the aluminum alloy cannot rely on the conventional one-step micro-arc oxidation film formation process in high-concentration aluminate solution, which affects the wear resistance of the film layer
At present, the one-step micro-arc oxidation coating technology at home and abroad cannot obtain an aluminum alloy micro-arc oxidation film layer with good wear resistance. Therefore, providing a method of using an electrolyte system for micro-arc oxidation treatment of aluminum alloys can improve the film layer. Protection performance is important

Method used

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  • Aluminum alloy surface micro-arc oxidation coating and preparing method thereof
  • Aluminum alloy surface micro-arc oxidation coating and preparing method thereof
  • Aluminum alloy surface micro-arc oxidation coating and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Preparation and pretreatment of matrix materials

[0058] The substrate is made of 6061 aluminum alloy, and its main components are shown in Table 1. Cut the aluminum alloy sheet into small cuboid pieces of 20mm×20mm×12mm by wire cutting, and wash off the oil stain remaining on the surface of the sample during the wire cutting process with gasoline. Use a drill press to drill a hole on the surface of 20 mm × 12 mm, and then use a tap to tap for easy clamping in the micro-arc oxidation experiment. Before the experiment started, the samples were polished on 400#, 600#, and 1000# sandpaper respectively, and then the samples were removed with acetone to remove the surface grease. After taking it out, wipe off the surface grease, then ultrasonically cleaned in alcohol, and then Rinse with deionized water and dry before use.

[0059] Table 1 Chemical composition of 6061 aluminum alloy (mass fraction, %)

[0060] Mg Si Cu Cr Fe Zn mn Ti Al 0.8...

Embodiment 2

[0072] 1. Preparation and pretreatment of matrix materials

[0073] Operate with embodiment 1.

[0074] 2. Electrolyte preparation

[0075] AcNa+(NaPO 3 ) 6 +Na 2 WO 4 The micro-arc oxidation experiment was carried out, and the specific composition of the electrolyte is shown in Table 3. Among them, the median particle size of micron-sized HBN is 0.7 μm, and the particle size range is 0.1-0.9 μm.

[0076] Table 3 Electrolyte formula of J11 acetate system

[0077] Sample No AcNa(g / L) (NaPO 3 ) 6 (g / L)

Na 2 WO 4 (g / L)

EDTA-2Na(g / L) HBN (g / L) J11 12 6 3 0.5 4.5

[0078] 3. Micro-arc oxidation treatment in coating preparation process

[0079] Operate with embodiment 1.

[0080] 4. Experiment and film formation process

[0081] Operate with embodiment 1.

Embodiment 3

[0083] 1. Preparation and pretreatment of matrix materials

[0084] Operate with embodiment 1.

[0085] 2. Electrolyte preparation

[0086] AcNa+(NaPO 3 ) 6 +Na 2 WO 4 The micro-arc oxidation experiment was carried out, and the specific composition of the electrolyte is shown in Table 4. Among them, the median particle size of micron-sized HBN is 0.7 μm, and the particle size range is 0.1-0.9 μm.

[0087] Table 4 Electrolyte formula of J21 acetate system

[0088] Sample No AcNa(g / L) (NaPO 3 ) 6 (g / L)

Na 2 WO 4 (g / L)

EDTA-2Na(g / L) HBN (g / L) J21 12 4 3 0.5 4.5

[0089] 3. Micro-arc oxidation treatment in coating preparation process

[0090] Operate with embodiment 1.

[0091] 4. Experiment and film formation process

[0092] Operate with embodiment 1.

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Abstract

The invention discloses an aluminum alloy surface micro-arc oxidation coating and a preparing method thereof. Micron-order or nanoscale hexagonal boron nitride is added into a natrium aceticum electrolysis system, a suited electrolyte formula is explored, and then the ceramic coating with the high antifriction erosion and abrasive resistance is prepared in the optimized electrolyte system. Hexagonal boron nitride particles exist in the coating, and the high antifriction erosion and abrasive resistance are achieved. A film is prepared on the aluminum alloy surface to increase the abrasive resistance of the surface and accelerating further industrialized application of an aluminum alloy.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a micro-arc oxidation coating on the surface of an aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum is a metal element with the most reserves in the earth's crust, and aluminum alloy is also one of the most important light alloys. Its light weight, low cost, excellent corrosion resistance, high thermal conductivity, and non-magnetic characteristics make it have good reliability Formability, weldability, and machinability are widely used in various industrial structural parts that require a certain strength. In order to adapt to different purposes, different series of deformed aluminum alloys have been produced, including aluminum-silicon alloys, aluminum-magnesium alloys, aluminum-lithium alloys, aluminum-copper alloys, aluminum-zinc alloys, and so on. However, as a structural material, aluminum alloy has disadvantages such as soft texture, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D11/10
CPCC25D11/10C25D15/00
Inventor 陈传忠王君峰于慧君
Owner SHANDONG UNIV
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