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Electrolytic solution for preparing nano ceramic coatings by micro-arc oxidation

A technology of micro-arc oxidation and nano-ceramics, which is applied in the field of electrolyte, can solve the problems of high surface roughness of the coating, which affects the promotion and application of ceramic coatings, etc., and achieves the effect of cheap raw materials, uniform microhardness distribution, and avoiding agglomeration

Inactive Publication Date: 2008-12-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned micropores and cracks make the surface roughness of the coating higher, which affects the further popularization and application of ceramic coatings.

Method used

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  • Electrolytic solution for preparing nano ceramic coatings by micro-arc oxidation
  • Electrolytic solution for preparing nano ceramic coatings by micro-arc oxidation
  • Electrolytic solution for preparing nano ceramic coatings by micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A 20kW DC pulsed micro-arc oxidation device is used to carry out micro-arc oxidation on the surface of aluminum alloy. The equipment is composed of a micro-arc oxidation power supply, an electrolytic tank, a stirring system and a cooling system. The micro-arc oxidation process is: sanding, degreasing, deionized water, rinsing, micro-arc oxidation, tap water rinsing, natural drying, the electrolyte is an analytically pure aqueous solution, the sample is used as an anode and immersed in the treatment solution, with a cooling system The stainless steel container is used as the cathode, and the power supply is operated in a constant current mode, and the micro-arc oxidation time is 30-90min.

[0066] Raw material preparation: Al 2 o 3 Nano powder (particle size 10~50nm) 2g, Na 2 B 4 o 7 10H 2 O 75.8g, distilled water 4L, LD31 aluminum alloy substrate.

[0067] Material preparation: According to the above composition, Na 2 B 4 o 7 10H 2 O dissolved in distilled wat...

Embodiment 2

[0069] Raw material preparation: Al 2 o 3 Nano powder (particle size 10~50nm) 4g, Na 2 B 4 o 7 10H 2 O 151.6g, distilled water 4L, LY12 aluminum alloy substrate.

[0070] Material preparation: According to the above composition, Na 2 B 4 o 7 10H 2 O dissolved in distilled water, Al 2 o 3 The nanopowder is poured into the bath and stirred. The micro-arc oxidation process adopts a constant current method, and the current density is 18A / dm 2 , the micro-arc oxidation time is 60min, and others are the same as in Example 1. The surface of the obtained nano-ceramic coating is smooth and the roughness is small.

Embodiment 3

[0072] Raw material preparation: Al 2 o 3 Nano powder (particle size 10~50nm) 2g, NaAlO 2 60g, distilled water 4l, LD31 aluminum alloy substrate.

[0073] Material preparation: According to the above composition, NaAlO 2 Dissolved in distilled water, the Al 2 o 3 The nanopowder is poured into the bath and stirred. The micro-arc oxidation process adopts a constant current method, and the current density is 15A / dm 2 , the micro-arc oxidation time is 60min, and others are the same as in Example 1. The surface of the obtained nano-ceramic coating is smooth and the roughness is small, and its scanning electron microscope photo is shown in figure 2 .

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Abstract

The invention provides an electrolyte used for preparing a nano-ceramic coating by micro-arc oxidation, as well as a method utilizing the electrolyte to conduct the surface treatment to aluminum or aluminum alloy surface for acquiring the nano-ceramic coating. The electrolyte is added with 0.2 to 1.0g / L of Al2O3 nano-powder. The Al2O3 nano-powder has a particle diameter of 10 to 50nm. The nano-ceramic coating material and the method for the production thereof mainly have the advantages of: (1) rather smooth surface of the prepared nano-ceramic coating and reduced roughness; (2) rather even distribution of micro-hardness; and (3) low-priced and common materials, simple process, low cost and being favorable for the industrialized production.

Description

(1) Technical field [0001] The invention relates to an electrolytic solution used for micro-arc oxidation to prepare a nano-ceramic coating, and a method for using the electrolytic solution to perform surface treatment on the surface of aluminum or aluminum alloy to obtain a nano-ceramic coating. (2) Background technology [0002] Due to the advantages of low density, high specific strength, good thermal conductivity, good corrosion resistance to atmospheric environment, and easy forming and processing, aluminum alloy has been widely used in engineering circles; however, due to its low hardness and non-wear resistance, it needs For surface preparation. With the development of modern industry and science and technology, ceramic materials have become another important engineering material after metal materials and polymer materials due to their unique properties and rich resource advantages. However, due to the high brittleness and poor machinability of monolithic ceramic mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 李红霞宋仁国赵坚郑晓华叶朋
Owner ZHEJIANG UNIV OF TECH
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