Electrolyte used for preparing black ceramic film through micro-arc oxidation, preparation method of electrolyte and micro-arc oxidation method

A technology of micro-arc oxidation and black ceramics, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of uneven distribution of coloring ions, porous film, etc., and achieve blackness saturation and controllable thickness , good stability

Active Publication Date: 2020-04-24
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides an electrolyte solution for micro-arc oxidation of black ceramic film and its preparation method and micro-arc oxidation method. Compared with the existing micro-arc oxidation technology, the use of toxic black color-developing metals is avoided. The invention optimizes the solution The preparation method adopts a step-by-step preparation method under a specific process to improve the stability of the coloring solution to obtain a more saturated blackening of the oxide film, thereby solving the uneven distribution of coloring ions on the surface of the magnesium alloy; by optimizing the micro-arc oxidation method, The method of constant pressure first and then constant current solves the problem of porous film and cracks caused by the traditional one-stage constant electric parameter method, makes the film denser, and can significantly improve the corrosion resistance and wear resistance of the substrate

Method used

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  • Electrolyte used for preparing black ceramic film through micro-arc oxidation, preparation method of electrolyte and micro-arc oxidation method
  • Electrolyte used for preparing black ceramic film through micro-arc oxidation, preparation method of electrolyte and micro-arc oxidation method
  • Electrolyte used for preparing black ceramic film through micro-arc oxidation, preparation method of electrolyte and micro-arc oxidation method

Examples

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Effect test

Embodiment 1

[0033] (1) After cutting the AZ91 magnesium alloy wire into a sample with a length × width × height of 10mm × 10mm × 2mm, and using 400, 500, 800, 1000, 1500 mesh SiC sandpaper on the pre-grinder to remove the surface oxide film step by step , wash with acetone for 5 minutes to remove oil, then use distilled water for ultrasonic cleaning for 5 minutes to remove surface impurities, wash with ethanol to remove water, and finally dry it for later use.

[0034](2) First take 1L of deionized water and pour it into the oxidation tank, then add 24g of sodium silicate, 12g of sodium fluoride and 4g of sodium hexametaphosphate in sequence, and carry out the dispersion treatment with a high-speed homogenizer in an ice-water bath at 0°C for 10 to 15 minutes. Prepare the first coloring solution; take 1L of deionized water and pour it into a beaker, add 8g of potassium sodium tartrate and 8g of copper pyrophosphate in turn, and perform magnetic stirring and hydrolysis treatment in a constan...

Embodiment 2

[0037] (1) After cutting the AZ91 magnesium alloy wire into a sample with a length × width × height of 10mm × 10mm × 2mm, and using 400, 500, 800, 1000, 1500 mesh SiC sandpaper on the pre-grinder to remove the surface oxide film step by step , wash with acetone for 5 minutes to remove oil, then use distilled water for ultrasonic cleaning for 5 minutes to remove surface impurities, wash with ethanol to remove water, and finally dry it for later use.

[0038] (2) First take 1L of deionized water and pour it into the oxidation tank, then add 30g of sodium silicate, 15g of sodium fluoride and 5g of sodium trimetaphosphate in turn, and carry out the dispersion treatment with a high-speed homogenizer in an ice-water bath at 0°C for 10 to 15 minutes. Prepare the first coloring solution; take 1L of deionized water and pour it into a beaker, add 10g of potassium sodium tartrate and 10g of copper phosphate in sequence, and magnetically stir and hydrolyze it in a constant temperature wate...

Embodiment 3

[0041] (1) After cutting the AZ91 magnesium alloy wire into a sample with a length × width × height of 10mm × 10mm × 2mm, and using 400, 500, 800, 1000, 1500 mesh SiC sandpaper on the pre-grinder to remove the surface oxide film step by step , wash with acetone for 5 minutes to remove oil, then use distilled water for ultrasonic cleaning for 5 minutes to remove surface impurities, wash with ethanol to remove water, and finally dry it for later use.

[0042] (2) First take 1L of deionized water and pour it into the oxidation tank, then add 32g of sodium silicate, 20g of sodium fluoride and 4g of sodium phosphate in sequence, and carry out dispersing treatment with a high-speed homogenizer in an ice-water bath environment at 0°C for 10 to 15 minutes to obtain The first coloring solution: take 1L of deionized water and pour it into a beaker, add 10g of potassium sodium tartrate and 12g of copper carbonate in turn, and magnetically stir and hydrolyze it in a constant temperature wa...

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Abstract

The invention belongs to the technical field of surface treatment of magnesium alloy materials, and discloses an electrolyte used for preparing a black ceramic film through micro-arc oxidation, a preparation method of the electrolyte and the micro-arc oxidation method. The technological method for obtaining the black morphology on the surface of a magnesium alloy is provided, and by preparing theelectrolyte synthesized by a first coloring liquid and a second coloring liquid according to a most suitable ratio, setting key technical parameters and adopting the first constant-pressure and constant-current two-step micro-arc oxidation method, the method obtains the black ceramic film with a thickness of about 15-30 [mu]m on the surface of the magnesium alloy. The process provided by the invention has good repeatability, the electrolyte has good stability and can be recycled, the obtained black ceramic film has uniform color, and good corrosion resistance and wear resistance, so that an application range of the magnesium alloy in electronic products is further expanded.

Description

technical field [0001] The invention relates to a surface treatment method of a magnesium alloy material, in particular to a method for coloring the surface of a magnesium alloy material by using a micro-arc oxidation technique. Background technique [0002] Magnesium alloy, as the recycling type and ultra-light green environmental protection material with the most development potential in the 21st century, has great application value in the fields of light-weight automobiles and electronic products, but the poor corrosion resistance and easy wear of magnesium alloys restrict its commercial use. biggest obstacle to development. Surface treatment is one of the simplest and most effective methods to improve the corrosion resistance and wear resistance of magnesium alloys, and it is also a common treatment method for surface decoration. [0003] The traditional anodic oxidation coloring technology is widely used in the surface coloring technology of magnesium alloys, but this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30C25D11/026C25D11/024
Inventor 潘太军何瑞钰薛路明陆鹏飞戴玉娇
Owner CHANGZHOU UNIV
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