Surface treating method for magnesium lithium alloy

A magnesium-lithium alloy, surface treatment technology, applied in anodizing and other directions, to achieve the effect of high efficiency, optimized effect and excellent corrosion resistance

Inactive Publication Date: 2008-08-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of micro-arc oxidation technology in the surface treatment of magnesium-lithium alloys has not been reported so far

Method used

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  • Surface treating method for magnesium lithium alloy
  • Surface treating method for magnesium lithium alloy
  • Surface treating method for magnesium lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The applied alloy is Mg-5.6%Li-3.5%Al-1%Zn-1.2%Ce-1.5%Mn alloy, the sample is cylindrical, the bottom surface is 16cm in diameter, 15cm in height, and the bottom surface is helical.

[0041] Table 1 Composition of electrolytes in different examples of micro-arc oxidation

[0042] Example 1

Example 2

Example 3

Sodium polyphosphate g / L

4

8

10

Sodium hexametaphosphate g / L

0.5

2

5

Sodium hydroxide g / L

3

4

3

Triethanolamine mL / L

10

10

0

Ethylenediamine mL / L

0

0

10

[0043] Glycerol mL / L

0

5

10

Silica nano powder g / L

0

0

5

Titanium dioxide nanopowder g / L

0

5

0

Aluminum oxide nanopowder g / L

0

0

5

[0044] (a) Pretreatment

[0045] The sample was degreased in 60g / L sodium hydroxide solution at 80°C for 7 minutes, ...

Embodiment 2

[0054] The applied alloy is Mg-11.2%Li-3%Al-1.4%Zn-1.5%Ce-1.8%Mn alloy, and the sample is cylindrical, with a bottom diameter of 16cm, a height of 15cm, and a spiral thread at the bottom.

[0055] Corrosion voltage and corrosion current comparison of magnesium-lithium alloy before and after micro-arc oxidation treatment in example 2 of table 3

[0056] Corrosion voltage (V)

Corrosion current density (A / cm 2 )

Before MAO

-1.536

1.59×10 -3

After micro-arc oxidation

-1.360

2.42×10 -6

[0057] (a) Pretreatment

[0058] The sample was degreased in 80g / L sodium hydroxide solution at 90°C for 10 minutes, rinsed and dried, polished with 500# metallographic sandpaper, rinsed with acetone, ethanol, and dried with cold air.

[0059] (b) Micro arc oxidation

[0060] The sample is completely immersed in the micro-arc oxidation electrolyte, the power supply is adjusted to the AC pulse gear, and the constant voltage micro-arc ox...

Embodiment 3

[0065] The applied alloy is a Mg-14.2%Li-3.1%Al-1.1%Zn-1.5%Ce alloy, and the sample is cylindrical, with a bottom diameter of 16cm, a height of 15cm, and a spiral thread at the center of the bottom surface.

[0066] Corrosion voltage and corrosion current comparison of magnesium-lithium alloy before and after micro-arc oxidation treatment in table 4 example 3

[0067] Corrosion voltage (V)

Corrosion current density (A / cm 2 )

Before MAO

-1.540

2.28×10 -3

After micro-arc oxidation

-1.340

4.12×10 -6

[0068] (a) Pretreatment

[0069] The sample was degreased in 80g / L sodium hydroxide solution at 90°C for 10 minutes, rinsed and dried, polished with 500# metallographic sandpaper, rinsed with acetone, ethanol, and dried with cold air.

[0070] (b) Micro arc oxidation

[0071] The sample is completely immersed in the micro-arc oxidation electrolyte, the power supply is adjusted to the AC pulse gear, and the step-up micro...

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Abstract

The invention provides a method for processing the surface of magnesium-lithium alloy. The technique of micro-arc oxidation is successfully applied to processing the surface of the magnesium-lithium alloy. Direct current/ DC pulse/alternating current pulse multiplex power supply is used and the magnesium-lithium alloy with different lithium contents in a compound electrolyte system of sodium polyphosphate, sodium silicate, calgon and sodium hydroxide is carried out by micro-arc oxidation for 2-120min. A ceramic oxide film of 10-100Mum with a rigidity higher than 200Hv is formed in situ on the surface of the magnesium-lithium alloy, thus remarkably improving corrosion resistant property compared with an alloy matrix, solving the problem known at home and abroad concerning processing the surface of the magnesium-lithium alloy and broadening the application in the fields of aviation, aerospace, car, electronic, etc.

Description

(1) Technical field [0001] The invention relates to an alloy surface treatment method, in particular to a magnesium-lithium alloy surface treatment method. (2) Background technology [0002] Magnesium-lithium alloy is the lightest metal structure material, its density is only 2 / 3-3 / 4 of that of ordinary magnesium alloy, and 1 / 2-2 / 3 of that of aluminum alloy. While the alloy is lightweight, the magnesium-lithium alloy has high specific strength, specific stiffness, good plastic denaturation ability and electromagnetic shielding ability, and has broad application prospects in aviation, aerospace, automobiles and electronics. However, since the standard electrode potential of lithium is more negative than that of magnesium ( E L i + / Li O = - 3.05 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C25D11/34
Inventor 袁艺于方朱果逸宋来文景晓燕张密林
Owner HARBIN ENG UNIV
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