Rare earth magnesium alloy micro arc oxidation green ceramic film preparation method

A technology of micro-arc oxidation and rare earth magnesium, which is applied in anodic oxidation and other directions, can solve the problem of relatively little research on the color of magnesium alloy micro-arc oxidation film, and achieve the effect of ensuring machinability, wide application and good corrosion resistance

Inactive Publication Date: 2008-05-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, domestic and foreign studies on the solution and process of preparing multi-color ceramic films by micro-arc oxidation on the surface of aluminum alloys have been relatively complete. There are relatively few studies on the color of magnesium alloy micro-arc oxidation films. Xi'an University of Technology used vanadate Brown and green series of ceramic membranes are obtained by different ratios with other substances (Wang Weifeng, Jiang Bailing, Li Junming, Shi Huiying. [J] "New Technology and New Technology" Materials and Surface Treatment Technology, 2006 (3)), also There are Gao Yinhui, Li Wenfang and others who use potassium permanganate as the yellow ceramic film made by coloring agent (Gao Yinhui, Li Wenfang, Du Jun, Zhang Qili, Jie Jun. [J] Journal of Materials Science and Engineering 2005, 23 (4)), and So far, a series of green ceramic films with uniform color from light green, medium green to dark green have not been prepared on the basis of good corrosion resistance with chromate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] I. The reagents used are:

[0040] Main film forming agent: sodium silicate (Na 2 SiO 3 9H 2 O)

[0041] Film-forming auxiliary agent: sodium fluoride (NaF)

[0042] pH adjuster: potassium hydroxide (KOH)

[0043] Coloring agent: Potassium dichromate (K 2 Cr 2 o 7 )

[0044] The chemical reagents used are analytically pure, and distilled water is used when preparing the treatment solution;

[0045] II. The equipment used is:

[0046] HD·MAO 100H-III micro-arc oxidation power supply, electrolytic tank, stirring system and cooling system;

[0047] The rare earth magnesium alloy material is: SJDM-1 rare earth magnesium alloy, and its main composition (W%) is shown in Table 1.

[0048] Table 1 SJDM-1 rare earth magnesium alloy chemical composition (W%)

[0049] alloy element%

Impurity content%≤

Zn

Zr

RE

Mg

Fe

Cu

Ni

Impurities

Total

0.1-2.5

0.2-1.2

1.0-4.5

margin

0.0...

Embodiment 2

[0064] I. The reagents used are:

[0065] Main film forming agent: sodium silicate (Na 2 SiO 3 9H 2 O)

[0066] Coating aid: sodium fluoride (NaF)

[0067] pH adjuster: potassium hydroxide (KOH)

[0068] Coloring agent: Potassium dichromate (K 2 Cr 2 o 7 )

[0069] The chemical reagents used are analytically pure, and distilled water is used when preparing the treatment solution;

[0070] II. The equipment used is:

[0071] HD·MAO 100H-III micro-arc oxidation power supply, electrolytic tank, stirring system and cooling system;

[0072] The rare earth magnesium alloy material is: SJDM-1 rare earth magnesium alloy, and its main composition (W%) is shown in Table 1.

[0073] Table 1 SJDM-1 rare earth magnesium alloy chemical composition (W%)

[0074] alloy element%

Impurity content%≤

Zn

Zr

RE

Mg

Fe

Cu

Ni

Impurities

Total

0.1-2.5

0.2-1.2

1.0-4.5

margin

0.01

0.02

...

Embodiment 3

[0089] I. The reagents used are:

[0090] Main film forming agent: sodium silicate (Na 2 SiO 3 9H 2 O)

[0091] Coating aid: sodium fluoride (NaF)

[0092] pH adjuster: potassium hydroxide (KOH)

[0093] Coloring agent: Potassium dichromate (K 2 Cr 2 o 7 )

[0094] The chemical reagents used are analytically pure, and distilled water is used when preparing the treatment solution;

[0095] II. The equipment used is:

[0096] HD·MAO 100H-III micro-arc oxidation power supply, electrolytic tank, stirring system and cooling system;

[0097] The rare earth magnesium alloy material is: SJDM-1 rare earth magnesium alloy, and its main composition (W%) is shown in Table 1.

[0098] Table 1 SJDM-1 rare earth magnesium alloy chemical composition (W%)

[0099] alloy element%

Impurity content%≤

Zn

Zr

RE

Mg

Fe

Cu

Ni

Impurities

Total

0.1-2.5

0.2-1.2

1.0-4.5

margin

0.01

0.02

...

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Abstract

The invention belongs to the technical field of magnesium alloy surface treatment, and relates to a process for preparing green ceramic membrane by micro-arc oxidation of a rare earth magnesium alloy. Using oil removaling, cleaning, washing, micro-arc oxidation coloring, hole sealing and drying for the surface of the rare earth magnesium alloy, thereby obtaining a series of ceramic membranes whose color are uniform and are from light green, medium green to dark green and are oxidized by micro-arc of SJDM-1 rare earth magnesium alloy. The ceramic membrane which is prerared through the process has an excellent wear resistance and hardness, at the same time the machinability of the ceramic membrane is further guaranteed, and the ceramic membrane has the characteristics of uniform colors, color diversity and the like.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and relates to a method for preparing a rare earth magnesium alloy micro-arc oxidation green ceramic film. technical background [0002] As the lightest engineering metal material, rare earth magnesium alloy has a series of characteristics such as light specific gravity, high specific strength and specific stiffness, but its extremely active chemical properties limit its application in various fields. [0003] Micro-arc oxidation technology is the sublimation of conventional anodizing treatment technology. The principle is to use magnesium alloy as the anode and the tank body or stainless steel plate as the cathode. Under high voltage, plasma micro-arc discharge is generated in the anode area, and the discharge time is short and the temperature is high (above 1000 ° C), which can vaporize the surrounding liquid. Generate a large number of electrons and positive and nega...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 潘利华原旭芳董秋阳张树恒金巨广
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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