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

Method for micro-arc depositing ceramic layer onto positive and negative bipolarities on magnesium alloy

A technology of micro-arc electrodeposition and magnesium alloy, which is applied in the direction of anodic oxidation, electrolytic inorganic material coating, etc., can solve the problems of high production cost and large power consumption, achieve high production efficiency, reduce power consumption, and reduce energy consumption. Effect

Inactive Publication Date: 2005-11-09
UNIV OF SCI & TECH BEIJING
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of high power consumption and high production cost in the above-mentioned micro-arc oxidation treatment on the surface of magnesium alloys, and proposes that magnesium alloy workpieces are used for both cathode and anode bipolar poles, and ceramics are deposited by micro-arc electrodeposition on the surface of magnesium alloys by using symmetrical AC pulse voltage. layer, not only can obtain a coating with good performance, but also the process and equipment are simple, and the work efficiency is high

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for micro-arc depositing ceramic layer onto positive and negative bipolarities on magnesium alloy
  • Method for micro-arc depositing ceramic layer onto positive and negative bipolarities on magnesium alloy
  • Method for micro-arc depositing ceramic layer onto positive and negative bipolarities on magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Using a bidirectional full-wave pulsed micro-arc oxidation power supply, connect the magnesium alloy specimen to the positive and negative poles of the power supply respectively. The entire technological process is: sample grinding, cleaning, degreasing, connecting wires electrified, micro-arc oxidation, cleaning the sample, and drying.

[0023] Taking AZ91D cast magnesium alloy as an example, the optimal scheme of cathode and anode bipolar micro-arc electrodeposition on the surface of magnesium alloy obtained by orthogonal optimization of electrolyte parameters and electrical parameters is as follows:

[0024] Na 2 SiO 3 9H 2 O 15g / L

[0025] NaOH 5g / L

[0026] h 3 BO 3 3g / L

[0027] CeF 4 ·H 2 O 1g / L

[0028] pH 12~13

[0029] Frequency 50Hz

[0030] Duty cycle 0.5

[0031] Time 60min

[0032] Voltage 220V

[0033] figure 2 and image 3 The structure and morphology of the cathode and anode AZ91D cast magnesium alloy micro-arc ceramic lay...

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
densityaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A technology for electrically depositing a ceramic layer on the surface of Mg alloy with the microarc between cathode and anode is disclosed. The pretreated Mg-alloy workpiece is connected respectively to the positive and negative electrodes of a high-power full-wave pulse power supply and then put in the alkaline electrolyte prepared from deionized water and sodium silicate. The cathode and anode of the electrolyzer are Mg-alloy workpiece. The symmetrical AC pulse voltage is used for the microarc depositing on the surface of Mg-alloy workpiece. The output voltage of power supply is continuously raised up with the progress of microarc oxidizing. Its advantages are less heat and energy consumption, low cost, and high effect and productivity.

Description

Technical field: [0001] The invention relates to a surface coating coating technology, in particular to a method for micro-arc electrodepositing a ceramic layer on an alloy surface. Background technique: [0002] Magnesium is the lightest metal material in engineering materials (density is 1.74g / cm 3 ), its alloys with aluminum, zinc, molybdenum, zirconium and other elements are widely used in automobiles, electronic aviation and other fields due to their excellent physical and mechanical properties. However, the chemical properties of magnesium are very active (the equilibrium potential is -2.34V), and its natural oxide film is loose and porous, which cannot form a good protective effect on the substrate, resulting in poor corrosion resistance of magnesium and its alloys, which seriously restricts the corrosion resistance of magnesium and its alloys. Alloys are used in various industries. [0003] The ceramic layer formed on the metal surface by micro-arc oxidation treatm...

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 Patents(China)
IPC IPC(8): C25D5/18C25D9/04C25D11/30
Inventor 张巍李久青刘元刚
Owner UNIV OF SCI & TECH BEIJING
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