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Zirconium oxide coating on aluminum alloy surface and method for producing the same

A technology of aluminum alloy surface and zirconia, applied in the direction of coating, electrolytic coating, electrolytic inorganic material coating, etc., can solve the problems of annealing of base material, low melting point of aluminum alloy, etc., and achieve the effect of high bonding strength and good protection

Inactive Publication Date: 2009-05-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of aluminum alloy is low, and methods such as plasma spraying are not applicable, which will cause annealing of the base material

Method used

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  • Zirconium oxide coating on aluminum alloy surface and method for producing the same
  • Zirconium oxide coating on aluminum alloy surface and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take an aluminum alloy test piece with a size of 60×60mm and mark it as 1#, use decontamination powder to degrease, and prepare electrolyte according to the following mass and volume ratio, zirconium hydroxide 5g / l, potassium hydroxide 2g / l. The aluminum alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. The frequency of the power supply is 50Hz, the positive phase and negative phase current duty ratios are 0.4, the positive phase voltage value is 500V, the negative phase voltage value is 100V, the processing time is 60min, and the thickness of the resulting coating is 60 microns. The hardness is 1700HV.

Embodiment 2

[0030] Take an aluminum alloy test piece with a size of 60×60mm, mark it as 2#, go through alkali washing, pickling and other processes in turn, prepare electrolyte according to the following mass and volume ratio, zirconia 5g / l, sodium hydroxide 2g / l . The aluminum alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. The frequency of the power supply is 500Hz, the positive phase and negative phase current duty ratios are 0.4 respectively, the positive phase voltage value is 550V, the negative phase voltage value is 110V, the processing time is 90min, the thickness of the generated coating is 95 microns, and the coating hardness is It is 1800HV.

Embodiment 3

[0032] Take a titanium alloy test piece with a size of 60×60mm and mark it as 3#, go through the processes of alkali washing and pickling in sequence, and prepare the electrolyte according to the following mass and volume ratio, zirconia 10g / l, ammonia water 2g / l. The aluminum alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. The frequency of the power supply is 500Hz, the positive phase and negative phase current duty ratios are 0.2, the positive phase voltage value is 580V, the negative phase voltage value is 130V, the processing time is 120min, the thickness of the generated coating is 140 microns, and the coating hardness is It is 1800HV.

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Abstract

The invention relates to zirconia coating on the aluminum alloy surface and a preparation method thereof, which belongs to the technical field of coating materials. The invention adopts a plasma electrolytic oxidation method to control the components of electrolytic solution comprising 1-100g / L of zirconia or zirconium hydroxide and 1-5g / L of soluble hydroxides. The prepared zirconia coating consists of tetragonal zirconia, monocline zirconia and gamma type alumina. The host crystalline phase is the tetragonal zirconia; and the thickness of the coating is 20 to 300 micrometers. The coating is suitable for processing the surface of a part with a more complex construction, and has high strength of bonding with a substrate and high hardness reaching 1,700 to 1,800HV.

Description

technical field [0001] The invention relates to a zirconia coating on the surface of an aluminum alloy and a preparation method thereof, belonging to the technical field of coating materials. Background technique [0002] Zirconia has stable chemical properties, except for sulfuric acid and hydrofluoric acid, it has good stability to acids, alkalis and alkali melts, glass melts and molten metals. Among various metal oxide ceramic materials, zirconia has the best high-temperature thermal stability and heat insulation performance, and is most suitable for ceramic coatings and high-temperature refractory products. The thermal conductivity of zirconia (1W / (m K)) is the lowest among common ceramic materials, especially at a high temperature of 1000°C, its thermal conductivity value is the lowest among all dense ceramic materials (2.3W / (m · K)). And the coefficient of thermal expansion (9×10 -6 ~11.5×10 -6 / K) is relatively close to metal materials, and has become an important...

Claims

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Application Information

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IPC IPC(8): C25D9/04C25D5/18C25D15/00
Inventor 辛世刚赵荣根宋力昕都徽
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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