Method for plasma micro arc oxidizing of light metal surface

A technology of micro-arc oxidation and plasma, which is applied in the direction of anodic oxidation, etc., can solve the problems that the inner and outer surfaces of the pores cannot be treated at the same time, it is difficult to improve the efficiency, and increase the processing performance, so as to avoid electrolyte splashing, high oxidation treatment efficiency, and reduce dispersion current. Effect

Inactive Publication Date: 2009-02-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the literature records of Chinese patent application number 022220631, a device for surface treatment of the inner hole of the part is described, but it requires a more complicated device, and it can only treat the inner surface of the hole, but not the inner and outer surfaces of the hole at the same time.
In addition, there are Chinese patent application numbers 998168645, 021115214, 971824800, and "Aluminum Alloy Micro-arc Oxidation Technology" on page 138 of the second issue of "Journal of Xi'an University of Technology" in 2000, all of which are described and recorded from the same principle and method framework. The method and equipment for oxidizing the surface of aluminum and its alloys have been discovered. These methods have some shortcomings that are not easy to improve efficiency and increase processing performance to varying degrees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Handling Workpieces: Gauge Aluminum Alloy Parts

[0011] Material model: duralumin LY12

[0012] Electrolyte formula: sodium silicate 10g / L

[0013] Sodium hydroxide 2.5g / L

[0014] Sodium Hexametaphosphate 1.5g / L

[0015] pH 12

[0016] Oxidation conditions: frequency 400Hz

[0017] Voltage: positive pulse peak voltage 400V

[0018] Negative pulse peak voltage 30V

[0019] Duty cycle 50%

[0020] Current density 8A / dm 2

[0021] Time 10min

[0022] Result: The film is dark gray, uniform and smooth, and the film thickness is 8μm to meet the requirements of use

Embodiment 2

[0024] Material model: duralumin LY12

[0025] Electrolyte formula: sodium silicate 10g / L

[0026] Sodium hydroxide 2.5g / L

[0027] Sodium borate 5g / L

[0028] Sodium tungstate 2g / L

[0029] pH 12

[0030] Oxidation conditions: frequency 400Hz

[0031] Voltage: positive pulse peak power 500V

[0032] Negative pulse peak voltage 40V

[0033] Duty cycle 50%

[0034] Current density 15A / dm 2

[0035] Time 360min

[0036] Result: Film thickness 200μm

[0037] Film hardness HV 2200

Embodiment 3

[0039] Select the inner hole parts (Φ18mmx50mm) as the processing workpiece.

[0040] Material model: deformed aluminum 8011

[0041] Electrolyte formula: sodium silicate 15g / L

[0042] Sodium hydroxide 5g / L

[0043] Sodium Hexametaphosphate 2g / L

[0044] Potassium sodium tartrate 1g / L

[0045] pH 13

[0046] Oxidation conditions: frequency 400Hz

[0047] Voltage: positive pulse peak voltage 300V

[0048] Negative pulse peak voltage 65V

[0049] Duty factor 30%

[0050] Current density 8A / dm 2

[0051] Auxiliary cathode 3mm diameter stainless steel wire

[0052]Time 10min

[0053] Result: The inner and outer surfaces were light gray, uniform in color, and the thickness of the surface smooth was 6 μm.

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Abstract

The present invention relates to plasma micro arc oxidizing process of light metal surface, and is especially surface oxidizing technological process for aluminum and aluminum alloy. The technological process adopts asymmetrical positive and negative pulse electric sources with continuously adjustable peak voltage, continuously adjustable pulse duty factor and frequency continuously adjustable in 20-2000 Hz; the pre-treated workpiece hung to anode and set inside electrolyte; stainless sheet suspended inside the electrolyte tank as cathode; neutral or alkaline electrolyte comprising metal silicate or metal phosphate and deionized water; and gas-liquid scanning treatment process, in which the workpiece to be oxidized is made to move back and forth in homogeneous speed inside the electrolyte for plasma micro arc discharge in the gas-liquid interface to form oxide film. The process is reliable, high in oxidation efficiency, high in metal surface treating performance and low in power consumption.

Description

Technical field: [0001] The invention relates to a method for performing plasma micro-arc oxidation on the surface of light metal, in particular to a technical process for performing oxidation treatment on the surface of aluminum and its alloy, that is, performing a plasma micro-arc oxidation treatment process on the surface of aluminum and its alloy to make A ceramic coating is formed on the surface, which can be widely used in the fields of machinery, electronics, aviation, automobile, engineering and other fields to protect magnesium, titanium and their alloys, especially aluminum and their alloy parts. technical background: [0002] Aluminum and its alloys have good mechanical and physical properties. They can be widely used in machinery, electronics, aviation, automobiles, engineering and other fields, and play an important role in the national economy. Although there is a layer of natural oxide film on the surface of aluminum, it is only about 10-100nm, which does not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/02
Inventor 石玉龙闫凤英谢广文
Owner QINGDAO UNIV OF SCI & TECH
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