Method for preparing steady-persistence luminous ceramic membrane through aluminum or aluminum alloy surface micro-arc oxidation

An aluminum alloy surface, long afterglow technology, applied in anodizing and other directions, can solve problems such as poor corrosion resistance, and achieve the effects of long service life, strong light storage, and good corrosion resistance

Inactive Publication Date: 2014-04-23
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of science and technology and economy in recent years, people's demand for luminescent materials is also increasing, and at the same time, higher requirements are put forward for the performance and service conditions of luminescent materials, and the corrosion resistance of current luminescent materials is relatively low. Poor, therefore, raising the SrAl-containing 2 o 4 The corrosion resistance and hardness of aluminum alloys are the key to applying aluminum alloy materials to the field of luminescent materials

Method used

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  • Method for preparing steady-persistence luminous ceramic membrane through aluminum or aluminum alloy surface micro-arc oxidation
  • Method for preparing steady-persistence luminous ceramic membrane through aluminum or aluminum alloy surface micro-arc oxidation
  • Method for preparing steady-persistence luminous ceramic membrane through aluminum or aluminum alloy surface micro-arc oxidation

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Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the method for preparing a long-lasting luminescent ceramic film by micro-arc oxidation on the surface of aluminum or aluminum alloy includes the following steps:

[0029] Step 1. Prepare a strontium salt system electrolyte with deionized water as a solvent. Each liter of electrolyte contains 15g of strontium carbonate, 10g of ammonium bifluoride, 10g of ammonium fluoride, 10g of diammonium hydrogen phosphate, 10g of potassium dihydrogen phosphate, and 12mL of glycerol. Adjust the pH value of the electrolyte to 7, then place the electrolyte in the electrolytic cell and let it stand for 24 hours;

[0030] Step 2. Place the aluminum alloy to be treated in the electrolyte solution described in step 1 as the anode, and the stainless steel plate as the cathode, using a micro-arc oxidation pulse power supply, and the pulse frequency is 550Hz, and the duty cycle is 15% under the condition of The aluminum alloy is subjected to micro-arc oxidation treatment. ...

Embodiment 2

[0041] The preparation method of this embodiment is the same as that of Example 1, except that the strontium salt is strontium hydroxide, strontium sulfate or strontium nitrate, or at least one of strontium carbonate, strontium hydroxide, strontium sulfate and strontium nitrate two kinds.

[0042] In this example, by using an electrolyte solution added with strontium salt, the surface of the aluminum alloy after micro-arc oxidation treatment is formed to contain SrAl 2 o 4 The long afterglow luminescent ceramic film, after the surface of the aluminum alloy is irradiated with visible light, it can emit fluorescence continuously for more than 24 hours in a dark place. At the same time, when the ceramic film formed on the surface of the aluminum alloy after the micro-arc oxidation treatment in this embodiment is not subjected to post-sealing treatment, the corrosion resistance of the ceramic film to neutral NaCl salt spray can reach more than 600h, and the microhardness can reac...

Embodiment 3

[0044] In this embodiment, the method for preparing a long-lasting luminescent ceramic film by micro-arc oxidation on the surface of aluminum or aluminum alloy includes the following steps:

[0045] Step 1. Use deionized water as a solvent to prepare a strontium salt system electrolyte. Each liter of electrolyte contains 22g of strontium nitrate, 12g of ammonium hydrogen fluoride, 11g of ammonium fluoride, 20g of diammonium hydrogen phosphate, 20g of potassium dihydrogen phosphate, and 5mL of glycerin. Adjust the pH value of the electrolyte to 7, then place the electrolyte in the electrolytic cell and let it stand for 24 hours;

[0046] Step 2. Place the aluminum to be treated in the electrolyte solution described in step 1 as the anode, and the stainless steel plate as the cathode. Using a micro-arc oxidation pulse power supply, the pulse frequency is 500Hz, and the duty ratio is 20% for the aluminum Perform micro-arc oxidation treatment. First, constant-voltage micro-arc oxi...

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Abstract

The invention discloses a method for preparing a steady-persistence luminous ceramic membrane through aluminum or aluminum alloy surface micro-arc oxidation. The method comprises the following steps that 1, a strontium salt system electrolytic solution is prepared by taking deionized water as a solvent, wherein the electrolytic solution contains strontium salt, ammonium bifluoride, ammonium fluoride, diammonium hydrogen phosphate, monopotassium phosphate and glycerol; and 2, aluminum or an aluminum alloy serves as an anode; a stainless steel plate serves as a cathode; a micro-arc oxidation pulse power supply is adopted; micro-arc oxidation treatment is performed at pulse frequency of 450-700Hz and at a duty ratio of 10-25%; in-situ growth is performed on the surface of aluminum or the aluminum alloy; and the steady-persistence luminous ceramic membrane containing SrAl2O4 is obtained. A growth rate of the ceramic membrane prepared with the method reaches above 3 micrometers/min; the neutral NaCl salt mist corrosion resistance of the ceramic membrane reaches above 600h; and the microhardness of the ceramic membrane can reach above 1000HV.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a method for preparing a long afterglow luminescent ceramic film by micro-arc oxidation on the surface of aluminum or aluminum alloy. Background technique [0002] In recent years, luminescent materials are widely used in transportation, industrial production, lighting decoration and people's daily life, such as traffic signs on expressways, traffic road markings, scales and pointers on instrument panels, power switches in daily life , clothing for outdoor workers at night, etc.; SrAl 2 o 4 It is an important substance that is not chemically active but can be used in luminescent materials. It contains SrAl 2 o 4 Aluminum or aluminum alloy has become a new material for preparing luminescent materials. [0003] Aluminum alloy has the advantages of low density, high plasticity, easy strengthening, good conductivity, corrosion resistance, easy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/06
Inventor 陈宏郝建民翁文琦陈永楠
Owner CHANGAN UNIV
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