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Method for preparing dark green ceramic membrane by magnesium alloy differential arc oxidation

A technology of micro-arc oxidation and ceramic film, applied in anodizing and other directions, can solve the problem of not being found, and achieve the effect of wide application, uniform color, and expansion of application fields

Inactive Publication Date: 2008-11-12
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

At present, in the research and development of magnesium alloy micro-arc oxidation technology, in terms of the protection of the alloy surface, the overall level of foreign countries is higher than that of China, but in terms of decoration, no relevant literature has been found abroad.

Method used

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  • Method for preparing dark green ceramic membrane by magnesium alloy differential arc oxidation
  • Method for preparing dark green ceramic membrane by magnesium alloy differential arc oxidation
  • Method for preparing dark green ceramic membrane by magnesium alloy differential arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] I. The reagents used are:

[0041] Main film forming agent: sodium silicate (Na 2 SiO 3 9H 2 O)

[0042] Coating aid: Potassium fluoride (KF)

[0043] pH adjuster: potassium hydroxide (KOH)

[0044] Complexing agent: concentrated ammonia (NH 3 )

[0045] Colorant: copper sulfate pentahydrate (CuSO 4 . 5H 2 O)

[0046] The chemical reagents used are analytically pure, and distilled water is used when preparing the treatment solution;

[0047] II. The equipment used is:

[0048] The MAO120HD-II micro-arc oxidation device developed by Xi'an University of Technology was used. The device is mainly composed of power supply and control system, oxidation tank, stirring system and cooling system.

[0049] The rare earth magnesium alloy material is: SJDM-1 rare earth magnesium alloy; its main composition (W%) is shown in Table 1.

[0050] Table 1 SJDM-1 rare earth magnesium alloy chemical composition (Wt%)

[0051]

[0052] III. Preparation of micro-arc oxidation ...

Embodiment 2

[0066] 1, the reagent used is with embodiment 1.

[0067] II, the equipment used is as embodiment 1.

[0068] The rare earth magnesium alloy material is as in Example 1.

[0069] III. Preparation of micro-arc oxidation coloring treatment solution

[0070] First take distilled water and pour it into the equipment, add reagents at room temperature, the order and concentration range of reagents are: sodium silicate (Na 2 SiO 3 9H 2 O) 10g / L, Potassium Fluoride (KF) 6g / L, Potassium Hydroxide (KOH) 5.5g / L, Stir continuously during the addition process, add another reagent after one reagent is completely dissolved, and complete the addition After that, stir until the reagent is completely dissolved; copper sulfate pentahydrate (CuSO 4 . 5H 2 O) After dissolving 1g / L with an appropriate amount of water, add 20ml / L concentrated ammonia water for complexation, place it for 10M-30Min, add it to the above-mentioned prepared solution, and continue stirring until it is evenly mixed....

Embodiment 3

[0083] 1, the reagent used is with embodiment 1.

[0084] II, the equipment used is as embodiment 1.

[0085] The rare earth magnesium alloy material is as in Example 1.

[0086] III. Preparation of micro-arc oxidation coloring treatment solution

[0087] First take part of the distilled water and pour it into the equipment, then add the reagents at room temperature, the order and concentration range of the reagents are: sodium silicate (Na 2 SiO 3 9H 2 O) 12g / L, Potassium Fluoride (KF) 9g / L, Potassium Hydroxide (KOH) 3g / L, Stir continuously during the addition process, add another reagent after one reagent is completely dissolved, after the addition is complete , stirred until the reagent was completely dissolved; copper sulfate pentahydrate (CuSO 4 . 5H 2 O) After dissolving 2.5g / L with an appropriate amount of water, add 50ml / L concentrated ammonia water for complexation, place it for 10M-30Min, then add it to the above-mentioned prepared solution, and continue to st...

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Abstract

The invention belongs to the magnesium alloy surface treatment technical field, mainly relating to the following steps that: colouring additive metal cation Cu<2+> undergoes ammonia water complexation so as to generate Cu(NH3)2<2+> which is added in alkaline basic electrolyte with sodium silicate as main salt; and electrical parameters adapted to the electrolyte are set to simultaneously carry out micro-arc oxidation and colouring of magnesium alloy, thereby making a series of bottle-green ceramic membranes with excellent corrosion resistance and stable color and luster. Different electrolytes have different coloring effects on a film, and the luster of an oxide film is mainly determined by the metal oxide formed in the oxide film and the structure of the salt of the metal oxide.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and relates to a method for preparing dark green ceramic film by micro-arc oxidation of magnesium alloy. technical background [0002] Magnesium alloy is the lightest metal among metal structural materials. It has a series of advantages such as high specific strength, good electromagnetic shielding, good shock absorption, and excellent casting performance, but its extremely active chemical properties limit its application. [0003] Microarc Oxidation (MAO for short) is also called plasma oxidation or anode spark deposition. This technology is to place aluminum, magnesium, titanium, niobium and other light metals and their alloys in a certain electrolyte, and under the combined action of thermochemistry, plasma chemistry and electrochemistry, a ceramic oxide film layer is formed on the metal surface. [0004] In the early 1930s, Gunterschulze and Betz jointly studied and...

Claims

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Application Information

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IPC IPC(8): C25D11/30C04B35/14
Inventor 潘利华杨春霞台洪波金臣广张树恒李俊玲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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