Method for preparing molten salt electrodeposition aluminium membrane on surface of aluminium based composite material

An aluminum-based composite material and electrodeposition technology, which is applied to the preparation of molten salt electrodeposited aluminum film on the surface of aluminum-based composite materials, surface coating and its preparation field, can solve the problem of poor anti-corrosion effect, small thickness of chemical conversion film, and formation Film poor and other problems, to achieve the effect of smooth aluminum film, good corrosion resistance, strong adhesion

Active Publication Date: 2011-09-21
ALUMICS MATERIALS INSTIUTUTE ANHUI CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a preparation method of molten salt electrodeposited aluminum film on the surface of aluminum-based composite materials, in which TiB is grown in situ 2 Prepare a layer of complete, dense, uniform, good adhesion to the matrix, and controllable thickness of the aluminum film on the surface of the particle-reinforced aluminum matrix composite material, which overcomes the anti-corrosion of the protective film formed on the surface of the aluminum matrix composite material by conventional surface treatment methods The effect is not as good as the protective film on the surface of the base metal, and it makes up for the shortcomings that anodic oxidation cannot form a continuous protective film (aluminum oxide film) on the surface of the aluminum matrix composite material, and makes up for the shortcoming of the overall thickness of the chemical conversion film and poor film formation at the particles insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The aluminum matrix composite material and pure aluminum are respectively polished and polished by 400#, 800#, 1200#, 2000# sandpaper.

[0019] 2) After mixing potassium chloride and sodium chloride evenly, heat and dry at 400°C for 8-10 hours.

[0020] 3) Mix anhydrous aluminum chloride, potassium chloride, sodium chloride and additives uniformly, heat up to 130° C. and melt to prepare an electrodeposition solution. The mass percent of each component in the electrodeposition solution is: 75% of anhydrous aluminum chloride, 11.5% of potassium chloride, 12% of sodium chloride and 1.5% of additives.

[0021] 4) In the electrodeposition solution, pure aluminum is used as the cathode, and the aluminum-based composite material is used as the anode, at 0.3A / dm 2 Electrochemical activation was carried out at a current density of 130 °C for a reaction time of 3 min.

[0022] 5) In the electrodeposition solution, the aluminum-based composite material is used as the cathode ...

Embodiment 2

[0025] 1) The aluminum matrix composite material and pure aluminum are respectively polished and polished by 400#, 800#, 1200#, 2000# sandpaper.

[0026] 2) After mixing potassium chloride and sodium chloride evenly, heat and dry at 400°C for 8-10 hours.

[0027] 3) Mix anhydrous aluminum chloride, potassium chloride, sodium chloride and additives uniformly, heat up to 130° C. and melt to prepare an electrodeposition solution. The mass percent of each component in the electrodeposition solution is: 78% of anhydrous aluminum chloride, 10% of potassium chloride, 10% of sodium chloride and 2% of additives.

[0028] 4) In the electrodeposition solution, pure aluminum is used as the cathode, and the aluminum-based composite material is used as the anode, at 0.4A / dm 2 Electrochemical activation was carried out at a current density of 130 °C for a reaction time of 5 min.

[0029] 5) In the electrodeposition solution, the aluminum-based composite material is used as the cathode and ...

Embodiment 3

[0032] 1) The aluminum matrix composite material and pure aluminum are respectively polished and polished by 400#, 800#, 1200#, 2000# sandpaper.

[0033] 2) After mixing potassium chloride and sodium chloride evenly, heat and dry at 400°C for 8-10 hours.

[0034] 3) Mix anhydrous aluminum chloride, potassium chloride, sodium chloride and additives uniformly, heat up to 130° C. and melt to prepare an electrodeposition solution. The mass percent of each component in the electrodeposition solution is: 82% of anhydrous aluminum chloride, 7.5% of potassium chloride, 8% of sodium chloride and 2.5% of additives.

[0035] 4) In the electrodeposition solution, pure aluminum is used as the cathode, and the aluminum-based composite material is used as the anode, at 0.5A / dm 2 Electrochemical activation was carried out at a current density of 130 °C for a reaction time of 8 min.

[0036] 5) In the electrodeposition solution, the aluminum-based composite material is used as the cathode and ...

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Abstract

The invention relates to a method for preparing a molten salt electrodeposition aluminium membrane on the surface of an aluminium based composite material and is directed to the field of composite material technology. A mixed salt and an additive are adopted to prepare acidic electrodeposition liquid, the aluminium based composite material is taken as the cathode and aluminium is taken as the anode. A direct current electrodeposition is carried out after an electric chemical activation to help form an aluminium membrane on the surface of the composite material. According to the invention, the shortcoming that the anticorrosion effect of a protection membrane formed on the surface of the aluminium based composite material through a routine surface treatment method is not as good as that of a matrix metal surface protection membrane is overcome and the deficiencies that a continuous protection membrane can not be formed on the surface of the aluminium based composite material by an anodization, the integral thickness of a chemical conversion film is not large and the film formed at the particle sites is bad are compensated.

Description

technical field [0001] The invention relates to a surface coating in the technical field of composite materials and its preparation, in particular to a preparation method of a molten salt electrodeposited aluminum film on the surface of an aluminum-based composite material. Background technique [0002] In situ endogenous TiB 2 In particle reinforced aluminum matrix composites, TiB has the advantages of good electrical conductivity, low density, high hardness, high melting point and good interface wettability. 2 The introduction of particles improves the strength, stiffness, wear resistance, elastic modulus and other properties of the composite material, making it have broad application prospects in many fields. The stability of the composite under environmental conditions is the prerequisite for its wide application, but due to the TiB 2 The presence of particles makes its corrosion resistance much lower than that of the base alloy, which severely limits its application i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/66
Inventor 黄文貌马乃恒王浩伟刘预周聪
Owner ALUMICS MATERIALS INSTIUTUTE ANHUI CO LTD
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