Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of aluminum alloy with surface being coated with ultrahard micro-arc oxidation ceramic membrane

A micro-arc oxidation, aluminum alloy technology, applied in anodizing, electrolytic coatings, coatings, etc., can solve problems such as low surface hardness, achieve excellent wear resistance, improve chemical stability, and reduce porosity.

Inactive Publication Date: 2019-01-11
北京杜尔考特科技有限公司 +2
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing an aluminum alloy whose surface is covered with a superhard micro-arc oxidation ceramic film, so as to solve the problem of low surface hardness of aluminum alloy products in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of the aluminum alloy whose surface is covered with super-hard micro-arc oxidation ceramic film of the present invention includes the steps of: placing the aluminum alloy in the electrolyte contained in a stainless steel container, using the aluminum alloy as the anode, and the stainless steel container as the cathode , apply a bipolar pulse voltage through the micro-arc oxidation pulse power supply, and control the current density and oxidation time to carry out the oxidation reaction until it is completely oxidized; then the aluminum alloy is taken out, rinsed and dried, and finally the surface is covered with superhard micro-arc oxidation ceramics Membrane aluminum alloy.

[0029] Preferably, the electrolyte includes a base electrolyte and additives, the base electrolyte includes water and one or more of sodium hydroxide, silicate, borate and phosphate; the additive includes water and zirconium oxychloride, One or more of yttrium nitrate, ceriu...

Embodiment 1

[0036]Specimen material: LY12, size 100×100mm, the surface of the aluminum alloy workpiece is placed in the electrolyte as the anode, and the stainless steel as the cathode. Electrolyte ratio: basic electrolyte concentration: sodium hydroxide 4.5g / L, sodium silicate 3.6g / L, sodium borate 6.8g / L; auxiliary additive concentration: zirconium oxychloride 0.3g / L, nitric acid Cerium is 0.9g / l, and the pH value of the electrolyte is 5-8. The frequency of the square wave pulse voltage applied to the electrolysis circuit is 260Hz, the forward voltage amplitude is 360V, the pulse width is 0.6ms, and the negative voltage amplitude is 520V, and the pulse width is 0.4. ms; the duty cycle is: positive duty cycle 10%, negative duty cycle 10%. Current density 3A / dm 2 , oxidation time 80min, electrolyte temperature 25 ℃.

[0037] The aluminum alloy micro-arc oxidation film of this embodiment can achieve superhard performance, wherein the thickness of the oxide film is tested according to GB...

Embodiment 2

[0039] Specimen material: 5083, size 100×100mm, the surface of the aluminum alloy workpiece is placed in the electrolyte as the anode, and the stainless steel as the cathode. Electrolyte ratio: basic electrolyte salt concentration: sodium hydroxide 2.5g / L, sodium silicate 4.5g / L, sodium phosphate 6g / L; auxiliary additive concentration: zirconium oxychloride 0.1g / L, nitric acid Yttrium is 0.2g / l, tetrabutyl titanate is 0.5g / l, and the pH value of the electrolyte is 5-8. The frequency of the square wave pulse voltage applied to the electrolysis circuit is 270Hz, the forward voltage amplitude is 350V, the pulse width is 0.6ms, and the negative voltage amplitude is 580V, and the pulse width is 0.4. ms; the duty cycle is: positive duty cycle 10%, negative duty cycle 10%. Current density 0.5-10A / dm 2 , the oxidation time is 90min, and the electrolyte temperature is 30°C.

[0040] The aluminum alloy micro-arc oxidation film of this embodiment can achieve superhard performance, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
frequencyaaaaaaaaaa
thicknessaaaaaaaaaa
surface roughnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of aluminum alloy with the surface being coated with an ultrahard micro-arc oxidation ceramic membrane, and belongs to the technical field of metal surfacetreatment. The preparation method of aluminum alloy with the surface being coated with the ultrahard micro-arc oxidation ceramic membrane comprises the steps that aluminum alloy is put into electrolyte in a stainless steel container, the aluminum alloy serves as the anode, the stainless steel container serves as the cathode, bipolar impulse voltage is applied through a micro-arc oxidation pulse power source, and the electric current density and the oxidation time are controlled for oxidation reaction till complete oxidation is achieved; and then, the aluminum alloy is taken out and dried after being washed, and finally, the surface being coated with the ultrahard micro-arc oxidation ceramic membrane is obtained. The preparation method is scientific in formula and simple in technology, theultrahard feature of the micro-arc oxidation membrane on the surface of an aluminum alloy rotation piece is achieved, and the service life of the aluminum alloy rotation piece is prolonged.

Description

technical field [0001] The invention relates to a method for preparing an aluminum alloy whose surface is covered with a superhard micro-arc oxidation ceramic film, and belongs to the technical field of metal surface treatment. Background technique [0002] At present, traditional rotating parts generally use high manganese steel as the main material. The production process of high manganese steel is simple, the quality is easy to control, and the cost is relatively low. It occupies a relatively important position in wear-resistant materials. However, high-manganese steel has a high density and high energy consumption. When it is subjected to severe impact and strong external force, it will undergo deformation work hardening and deformation-induced martensitic transformation. In addition, its wear resistance restricts the service life of the rotating parts. It can be seen that there is a need to find a new type of lightweight alloy material. [0003] Aluminum alloy has low ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D15/00
CPCC25D11/024C25D11/026C25D11/08C25D15/00
Inventor 姜蕊韩雪原穆海礁王霏郭泉忠郭兴华吴良杰王勇
Owner 北京杜尔考特科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com