Method for electrophoretic deposition of rare-earth lanthanum oxide film on aluminium alloy surface

An oxide film, electrophoretic deposition technology, applied in electrophoretic plating, electrolytic coatings, coatings, etc., can solve the problems of long time required, impractical, complex solution formulation, etc., to achieve high stability, simple process, deposition short time effect

Inactive Publication Date: 2009-06-10
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, its various existing methods have their limitations, such as the long-time immersion treatment process of rare earth solution, the required time is too long, the conversion layer formed is relatively thin, which is not conducive to practical application, and the solution formula is complicated; the cerium-molybdenum treatment process The treatment temperature is relatively high, and the treatment liquid needs to be kept in a boiling state, which is not conducive to actual production and application; the formula of the treatment liquid containing oxidants or film-forming accelerators needs to be improved, and the process stability needs to be strengthened; the treatment temperature of the molten salt immersion method is relatively high. High, not practical in actual production

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  • Method for electrophoretic deposition of rare-earth lanthanum oxide film on aluminium alloy surface
  • Method for electrophoretic deposition of rare-earth lanthanum oxide film on aluminium alloy surface
  • Method for electrophoretic deposition of rare-earth lanthanum oxide film on aluminium alloy surface

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Embodiment 1

[0018] Example 1 Using optimized process parameters, AA5083 and AA6061 were subjected to surface electrophoretic deposition of La oxide film treatment. AA5083 and AA6061 aluminum alloys were all processed according to the steps described in the summary of the invention, and La(NO 3 ) 3 The concentration of ethanol solution is 0.1mol / L, the applied potential is 12V, and the deposition time is 40s to form a rare earth film. Then, under a nitrogen atmosphere, the temperature is controlled at 280° C., and the La oxide film is formed by baking for 30 minutes. The formed rare earth film has smooth surface, compact structure and good corrosion resistance. A large number of intermetallic compound phases can be observed on the surface of polished AA5083 aluminum alloy and AA6061 aluminum alloy, and these phases are often the preferential corrosion sites.

[0019] attached figure 1 with figure 2 It is a typical surface morphology diagram of AA5083 and AA6061 aluminum alloy samples ...

Embodiment 2

[0021] Embodiment 2 Use other process parameters to carry out surface electrophoretic deposition La oxide film treatment on AA5083 and AA6061. AA5083 and AA6061 aluminum alloys are all processed according to the steps described in the summary of the invention, and La(NO 3 ) 3 The concentration of ethanol solution is 0.1mol / L, the applied potential is 6V, and the deposition time is 120s to form a rare earth film. Then, under a nitrogen atmosphere, the temperature is controlled at 280° C., and the La oxide film is formed by baking for 30 minutes.

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Abstract

The invention belongs to the technical field of aluminum alloy surface modification and in particular relates to a method for depositing a rare-earth lanthanum oxide film on the surface of aluminum alloy through electrophoresis. The method is characterized in that a rare-earth ion organism complexing electrophoresis method is utilized to deposit the rare-earth film on the surface of the aluminum alloy; and an even rare-earth oxide film is obtained on the surface of the aluminum alloy through roasting. The method has the advantages of simple process, short deposition time, high stability, economy and no pollution; and the even lanthanum oxide film obtained from the surface of the aluminum alloy treated through the technology can effectively improve the anticorrosive performance of the aluminum alloy and has important application and research value.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface modification, and in particular relates to a method for electrophoretic deposition of a rare earth lanthanum oxide film on the surface of an aluminum alloy. Background technique [0002] Due to its high mechanical strength and low density, aluminum alloys are widely used in aerospace, automobile, construction, daily necessities and other fields. However, aluminum alloys have certain local corrosion sensitivity, so improving their corrosion resistance through surface modification methods will become the key to improving the overall performance of aluminum alloys. [0003] For a long time, the chromate treatment process has been used on aluminum alloys to meet high corrosion resistance requirements, however, due to the toxic Cr 6+ , causing environmental pollution, many countries have listed chromate as one of the most harmful compounds, and the use of chromate has been strictly rest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02
Inventor 蒋益明项秋伟孙道明王浩钟澄李劲
Owner FUDAN UNIV
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