Preparation method for black abrasion-resistant micro-arc oxidization ceramic layer of magnesium alloy

A micro-arc oxidation, magnesium alloy technology, applied in anodizing, coating, surface reaction electrolytic coating and other directions, can solve the problems of cumbersome process, uneven color, easy to fall off, etc., achieve simple process, obvious industrial value, Strong corrosion resistance effect

Active Publication Date: 2018-05-08
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in anodic oxidation coloring: for example, the oxide film formed by anodic oxidation is relatively brittle, has poor bonding performance with the substrate, and is easy to fall off under stress; and for example, it must be sealed with resin or coating under many conditions. , cumbersome process, etc.
Chinese patent CN102021631A discloses a method for treating black hard micro-arc oxidation ceramic film on the surface of magnesium alloy. This method can produce black micro-arc oxidation ceramic layer, but the color of the prepared black ceramic layer is not uniform, and the same batch of parts can be processed Large fluctuations in color
In the process of processing, due to uneven stirring or consumption of electrolyte, the proportion of electrolyte will change, which will directly lead to uneven color
Chinese patent CN103173836A discloses a magnesium alloy micro-arc oxidation low-energy black ceramic film and its preparation method. This method can produce a black micro-arc oxidation ceramic layer, but the prepared black ceramic layer cannot meet the requirements of high wear resistance. Require

Method used

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  • Preparation method for black abrasion-resistant micro-arc oxidization ceramic layer of magnesium alloy
  • Preparation method for black abrasion-resistant micro-arc oxidization ceramic layer of magnesium alloy
  • Preparation method for black abrasion-resistant micro-arc oxidization ceramic layer of magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The parts to be processed are AZ80 test pieces (100mm×50mm×3mm), and the specific operation steps are as follows:

[0023] (1) Pretreatment: Use sandblasting to clean the surface of the parts, then wash with water to remove residues, and use ultrasonic waves to degrease in absolute ethanol, and finally clean with deionized water and dry with hot air.

[0024] (2) Solution configuration: sodium silicate 12g / L, potassium fluoride 8g / L, potassium hydroxide 15g / L, triethanolamine 15ml / L, ammonium metavanadate 2g / L, sodium orthovanadate 6g / L, nano SiC 5g / L, nano-graphite 3g / L.

[0025] (3) Micro-arc oxidation: Clamp the pretreated parts on the anode and immerse them all in the electrolyte. The parameters of micro-arc oxidation are: voltage 400V, frequency 600Hz, duty cycle 20%, oxidation time 25min. During the micro-arc oxidation process, the electrolyte was continuously stirred and cooled with circulating water, and the measured temperature of the electrolyte was 35°C.

...

Embodiment 2

[0029] The part to be processed is the ZK60 sealing cover, and the specific operation steps are as follows:

[0030] (1) Pretreatment: Use sandblasting to clean the surface of the parts, then wash with water to remove residues, and use ultrasonic waves to degrease in absolute ethanol, and finally clean with deionized water and dry with hot air;

[0031] (2) Solution configuration: sodium silicate 5g / L, potassium fluoride 15g / L, potassium hydroxide 25g / L, triethanolamine 5ml / L, ammonium metavanadate 6g / L, sodium orthovanadate 2g / L, nano SiC 6g / L, nano-graphite 2g / L.

[0032] (3) Micro-arc oxidation: Clamp the pretreated parts on the anode and immerse them all in the electrolyte. The parameters of micro-arc oxidation are: voltage 550V, frequency 600Hz, duty cycle 35%, oxidation time 20min. During the micro-arc oxidation process, the electrolyte was continuously stirred and cooled by circulating water, and the actual temperature of the electrolyte was 28°C.

[0033] (4) Post-pr...

Embodiment 3

[0036] The part to be processed is the AZ80 rear sphere, and the specific operation steps are as follows:

[0037] (1) Pretreatment: Use sandblasting to clean the surface of the parts, then wash with water to remove residues, and use ultrasonic waves to degrease in absolute ethanol, and finally clean with deionized water and dry with hot air;

[0038] (2) Solution configuration: sodium silicate 5g / L, potassium fluoride 10g / L, potassium hydroxide 40g / L, triethanolamine 10ml / L, ammonium metavanadate 2g / L, sodium orthovanadate 6g / L, nano SiC 4g / L, nano-graphite 2g / L.

[0039] (3) Micro-arc oxidation: Clamp the pretreated parts on the anode and immerse them all in the electrolyte. The parameters of micro-arc oxidation are: voltage 550V, frequency 400Hz, duty cycle 20%, oxidation time 35min. During the micro-arc oxidation process, the electrolyte was continuously stirred and cooled with circulating water, and the measured temperature of the electrolyte was 35°C.

[0040] (4) Post-p...

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Abstract

The invention provides a preparation method for a black abrasion-resistant micro-arc oxidization ceramic layer of a magnesium alloy. The magnesium alloy is dipped into electrolyte to be subjected to micro-arc oxidization so that the black abrasion-resistant micro-arc oxidization ceramic layer can be prepared; the electrolyte comprises 5-20 g/L of sodium silicate, 5-15 g/L of potassium fluoride, 1-60 g/L of potassium hydroxide, 5-25 g/L of triethanolamine, 2-6 g/L of ammonium meta-vanadate, 2-6 g/L of sodium orthovanadate, 2-10 g/L of nanometer SiC and 2-5 g/L of nanometer graphite. The black abrasion-resistant ceramic layer of the magnesium alloy can reach the level 9 according to 350 h of a neutral salt spray test, the Vickers hardness HV can reach 553-605, the friction coefficient is 0.08-0.14, the abrasion rate is 0.006-0.009 mg/min, the beneficial effects that stability is good, color is uniform and color fading is not prone to occurrence are all achieved, and the black abrasion-resistant micro-arc oxidization ceramic layer of the magnesium alloy is very suitable for preparing an optical collimator and other systems. The preparation method for the black abrasion-resistant micro-arc oxidization ceramic layer of the magnesium alloy is simple in technological process, convenient to operate, small in pollution and remarkable in industrial value.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a method for preparing a black wear-resistant micro-arc oxidation ceramic layer of magnesium alloy. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength and specific stiffness, good damping and shock absorption, etc. It has important application value and broad market prospects in aerospace, national defense, automobile, electronics and other fields. Due to the low potential of the standard electrode of magnesium alloys, it is easy to lose electrons and undergo oxidation reactions, resulting in poor corrosion resistance of magnesium and magnesium alloys. Therefore, surface protection is usually required for magnesium and magnesium alloy parts. In addition, specific performance is required for different application fields. For example, when magnesium alloy is used in systems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 夏祥生陈强舒大禹林军黄树海康风
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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