Process for preparing high-light-absorption-rate black ceramic film layer through micro-arc oxidation of surface of magnesium alloy

A micro-arc oxidation and black ceramic technology, applied in the black ceramic film preparation process and the black ceramic film technology field, can solve the problems of complex electrolyte composition and high processing cost, and achieve high light absorption performance, high blackness, and film. The effect of high layer density and hardness

Inactive Publication Date: 2015-06-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few treatment methods for the black film layer on the surface of magnesium alloy. Chinese patents "A method for treating black hard micro-arc oxidation ceramic film on the surface of magnesium alloy" (Patent No.: CN 201010530357.2) and "Magnesium alloy micro-arc oxida

Method used

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  • Process for preparing high-light-absorption-rate black ceramic film layer through micro-arc oxidation of surface of magnesium alloy
  • Process for preparing high-light-absorption-rate black ceramic film layer through micro-arc oxidation of surface of magnesium alloy
  • Process for preparing high-light-absorption-rate black ceramic film layer through micro-arc oxidation of surface of magnesium alloy

Examples

Experimental program
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Example Embodiment

[0023] Example 1:

[0024] The preparation method of the black micro-arc oxidation ceramic film layer on the surface of magnesium alloy, the specific preparation process conditions and operation steps are as follows:

[0025] 1) Pre-treatment of the sample: polish the flake magnesium alloy smoothly, then ultrasonically clean it with acetone and water respectively, and dry it for later use;

[0026] 2) Electrolyte configuration: weigh 20g sodium silicate, 12.5g sodium phosphate, 8g ammonium fluoride, 6g sodium vanadate, 4g ammonium metavanadate, mix well, add 1L water, stir, fully dissolve and set aside;

[0027] 3) Electrical parameter setting: constant current mode, current density 15A / dm 2 , frequency 175Hz, duty cycle 30%, positive and negative pulse current ratio 1:1, response time 15min;

[0028] 4) Micro-arc oxidation on the surface of the magnesium alloy: use the above-mentioned treated magnesium alloy sample as the anode, completely immerse in the abo...

Example Embodiment

[0033] Example 2:

[0034] The preparation method of the black micro-arc oxidation ceramic film layer on the surface of magnesium alloy, the specific preparation process conditions and operation steps are as follows:

[0035] 1) sample pretreatment: with embodiment 1;

[0036] 2) Electrolyte configuration: weigh 15g sodium silicate, 20g sodium phosphate, 6g ammonium fluoride, 8g sodium vanadate, 2g ammonium metavanadate, mix well, add 1L water, stir, fully dissolve and set aside;

[0037] 3) Electrical parameter setting: constant current mode, current density 16.7A / dm 2 , frequency 200Hz, duty cycle 20%, positive and negative pulse current ratio 1:1, response time 20min;

[0038] 4) micro-arc oxidation on the surface of magnesium alloy: same as embodiment 1;

[0039] 5) post-processing: with embodiment 1.

[0040] The prepared micro-arc oxidation ceramic film was evaluated and characterized. The blackness of the black ceramic film reached 0.8; the averag...

Example Embodiment

[0041] Example 3:

[0042] The preparation method of the black micro-arc oxidation ceramic film layer on the surface of magnesium alloy, the specific preparation process conditions and operation steps are as follows:

[0043] 1) sample pretreatment: with embodiment 1;

[0044] 2) Electrolyte configuration: Weigh 10g sodium silicate, 5g sodium phosphate, 12g ammonium fluoride, 5g sodium vanadate, 5g ammonium metavanadate, mix well, add 1L water, stir, fully dissolve and set aside;

[0045] 3) Electrical parameter setting: constant current mode, current density 20A / dm 2 , frequency 175Hz, duty cycle 30%, positive and negative pulse current ratio 2:1, response time 30min;

[0046] 4) micro-arc oxidation on the surface of magnesium alloy: same as embodiment 1;

[0047] 5) post-processing: with embodiment 1.

[0048] The prepared micro-arc oxidation ceramic film was evaluated and characterized. The blackness of the black ceramic film reached 1.0; the ave...

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Abstract

The invention discloses a process for preparing a high-light-absorption-rate black ceramic film layer through micro-arc oxidation of the surface of a magnesium alloy. In an electrolyte solution with silicate or phosphate as a main salt, the magnesium alloy is subjected to micro-arc oxidation treatment by an alternating-current bipolar pulse power source. The electrolyte solution for preparing the high-light-absorption-rate black ceramic film layer through micro-arc oxidation of the surface of the magnesium alloy is simple in composition and easy to operate, and has less pollution to the environment; the prepared black ceramic film layer not only has the performance of good corrosion resistance and high light absorption rate, but also has good apparent decoration, and can satisfy practical application requirements.

Description

technical field [0001] The invention describes a preparation process of a black ceramic film with high light absorption rate on the surface of a magnesium alloy, specifically relates to a process technology of a black ceramic film layer, and belongs to the technical field of metal surface treatment. Background technique [0002] The density of magnesium is 1.74g / cm 3 , is 2 / 3 of aluminum. As the lightest metal structure material, magnesium has a series of unique performance advantages such as high specific strength, high shock resistance, high heat dissipation, anti-electromagnetic interference and excellent light and thin structure formability. Its light weight and recyclable These characteristics make it an ideal material for modern industrial products. In recent years, magnesium materials have been widely used in automobiles, motorcycles, bicycles and other vehicles, home appliances, electronic appliances, computers, communication equipment, aerospace, national defense ...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 彭振军梁军刘百幸周兆福
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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