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Anode oxidating electrolysing liquid under inhibiting arc state of magnesium alloy and process for anode oxidating

A technology of anodizing and magnesium alloys, applied in anodizing and other directions, can solve the problems of rough and porous magnesium oxide film, affecting the use of materials, hidden dangers in safe production, etc., and achieve the effects of low average current density, reduced porosity, and safe production.

Inactive Publication Date: 2006-06-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the anodizing process of magnesium alloys is mostly accompanied by strong sparks or micro-arc discharge, the temperature is too high, and a large amount of heat is released, which brings hidden dangers to safe production, and large-scale cooling equipment is required in commercial production, which increases production costs. ; At the same time, the magnesium oxide film formed by anode spark or micro-arc discharge deposition is often rough and porous, which affects the use of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0038] 1 raw material

[0039] AZ91D magnesium alloy material (the sample is a cylinder with a diameter of 30mm and a height of 9mm.)

[0040] 2 process flow

[0041] Same as Example 1

[0042] Ethylamine

Diethylenetriamine

Dipotassium phosphate

Sodium Tungstate

sodium acetate

sodium fluoride

50g / L

50g / L

8g / L

6g / L

1g / L

5g / L

[0043] 4 Arc-suppressed electrochemical anodizing process

[0044] The magnesium alloy material is placed in the electrolytic cell for arc-suppressed anodic oxidation treatment, and the anodized voltage is controlled to rise from 0 volts to 100 volts within 30 seconds, and the anodized current increases with the increase of voltage, reaching a peak current density of 15A / dm 2 , and last for 10 seconds, and then let the film formation proceed automatically until the end of the film formation (during the operation, when the current density drops to 2A / dm 2 When around , it is conside...

Embodiment 3

[0048] 1 raw material

[0049] AZ91D magnesium alloy material (the sample is a cylinder with a diameter of 30mm and a height of 9mm.)

[0050] 2 process flow

[0051] Same as Example 1

[0052] Dimethylamine

ethanolamine

sodium phosphate

Sodium Tungstate

sodium propionate

Sodium fluoborate

70g / L

80g / L

12g / L

8g / L

4g / L

5g / L

[0053] 4 Arc-suppressed electrochemical anodizing process

[0054] Place the magnesium alloy material in the electrolytic cell for arc-suppressed anodizing treatment, control the anodizing voltage to rise from 0 volts to 80 volts within 30s, and the anodizing current increases with the voltage rising, reaching a peak current density of 16A / dm 2 , and last for 8 seconds, and then let the film formation proceed automatically until the end of the film formation (during the operation, when the current density drops to 2A / dm 2 When around , it is considered that the film forming process is o...

Embodiment 4

[0058] 1 raw material

[0059] AZ31 magnesium alloy material (the sample is a cylinder with a diameter of 30mm and a height of 9mm.)

[0060] 2 process flow

[0061] Same as Example 1

[0062] Amylamine

Ethylenediamine

sodium pyrophosphate

Sodium terephthalate

Sodium fluoroborate

35g / L

45g / L

6g / L

2g / L

4g / L

[0063] 4 Arc-suppressed electrochemical anodizing process

[0064] The magnesium alloy material is placed in the electrolytic cell for arc-suppressed anodic oxidation treatment, and the anodized voltage is controlled to rise from 0 volts to 150 volts within 30 seconds, and the anodized current increases with the increase of voltage, reaching a peak current density of 20A / dm 2 , and last for 5 seconds, and then allow the film formation to proceed automatically until the end of the film formation (during the operation, when the current density drops to 2A / dm 2 When around , it is considered that the film forming...

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Abstract

The invention relates to magnesium alloy anodic oxidation electrolyte and anodic oxidation method under arc inhibiting state. The electrolyte is used water as solvent; and its component are 75-150g / L organic amine, 6-12g / L inorganic phosphatic and boron compounds, 1-4g / L organic carboxylate, 2-5g / L fluoride, 4-10g / L metal oxysalt. Its feature is that the magnesium alloy anodic oxidation surface do not happen spark discharge in high oxidation pressure and oxidation peak current parameter. And it has the advantages of low solution toxicity, fast film forming, safe and simple operation, and low cost. The formed anodic oxide film is smooth and compact, has high hardness, and can increase magnesium and its alloy corrosion resistance. The film can be used as magnesium alloy protective layer and other coating foundation base.

Description

Technical field: [0001] The invention relates to an anodic oxidation electrolyte and an anodic oxidation method for a magnesium alloy material in an arc-suppressed state. technical background: [0002] Due to its excellent physical, chemical, mechanical properties, light specific gravity, high specific strength and specific stiffness, and good thermal and electrical conductivity, magnesium alloy materials have been continuously developed in the fields of aerospace, electronics, communications, and automobile manufacturing. Especially in the past ten years, with the rapid development of the automobile industry and the electronic industry, a large number of magnesium alloy parts have been used to replace plastic or even steel parts. However, the chemical stability of magnesium is low, the standard equilibrium potential is very negative (-2.34V), and the corrosion resistance is poor, which restricts its due advantages. Therefore, enhancing the corrosion resistance of magnesium ...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 旷亚非罗胜联周海晖戴磊
Owner HUNAN UNIV
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