CN115198331A - Electrolyte and micro-arc oxidation method of high-thermal-conductivity magnesium alloy - Google Patents
Electrolyte and micro-arc oxidation method of high-thermal-conductivity magnesium alloy Download PDFInfo
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- CN115198331A CN115198331A CN202110400197.8A CN202110400197A CN115198331A CN 115198331 A CN115198331 A CN 115198331A CN 202110400197 A CN202110400197 A CN 202110400197A CN 115198331 A CN115198331 A CN 115198331A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 94
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 86
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 37
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 37
- 239000001488 sodium phosphate Substances 0.000 claims abstract description 26
- 229910000162 sodium phosphate Inorganic materials 0.000 claims abstract description 26
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims abstract description 26
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 92
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 42
- 239000010935 stainless steel Substances 0.000 claims description 30
- 229910001220 stainless steel Inorganic materials 0.000 claims description 30
- 239000000654 additive Substances 0.000 claims description 7
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 235000011187 glycerol Nutrition 0.000 description 31
- 230000000052 comparative effect Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000002904 solvent Substances 0.000 description 12
- 239000011148 porous material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to an electrolyte and a micro-arc oxidation method of a high-thermal-conductivity magnesium alloy. The electrolyte is used in the micro-arc oxidation treatment of the high-thermal-conductivity magnesium alloy, and is an aqueous solution containing sodium silicate and sodium phosphate. In the micro-arc oxidation method of the high-heat-conductivity magnesium alloy, the electrolyte is used as the electrolyte in the micro-arc oxidation treatment. According to the invention, through improving the components of the electrolyte, the sodium silicate and the sodium phosphate are added into the electrolyte at the same time, the point discharge in the micro-arc oxidation treatment of the high-thermal conductivity magnesium alloy can be effectively inhibited, the good film forming quality is realized on the high-thermal conductivity magnesium alloy, and the high film thickness and the good porosity are obtained, so that the good corrosion resistance is realized.
Description
Technical Field
The invention relates to an electrolyte and a micro-arc oxidation method of a high-thermal-conductivity magnesium alloy.
Background
Micro-arc oxidation is a commonly used metal surface treatment method. In the micro-arc oxidation process, under the action of instantaneous high temperature and high pressure generated by arc discharge, a modified film layer which takes matrix metal oxide as a main component and is supplemented with electrolyte components grows on the surfaces of valve metals such as aluminum, magnesium, titanium and the like and alloys thereof, so that the corrosion resistance and the wear resistance of the metals can be improved. In the prior art, a plurality of micro-arc oxidation technologies for common magnesium alloy are adopted, and a plurality of achievements are achieved. However, there are few researches on the micro-arc oxidation technology of high thermal conductivity magnesium alloy. In addition, if the high-heat conductivity magnesium alloy is treated by adopting the technology used in the micro-arc oxidation treatment of the common magnesium alloy, because the high-heat conductivity magnesium alloy has high heat conductivity and electric conductivity, point discharge is easy to generate in the micro-arc oxidation treatment process, and further the thickness of a film layer is uneven, the number of pores of the film is large after the film is formed, and the corrosion resistance of the treated magnesium alloy is poor.
Disclosure of Invention
Problems to be solved by the invention
Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electrolyte and a micro-arc oxidation method for a high thermal conductivity magnesium alloy, which can perform micro-arc oxidation treatment on the high thermal conductivity magnesium alloy to achieve good film formation quality and good corrosion resistance in the high thermal conductivity magnesium alloy.
Means for solving the problems
In order to achieve the above object, one embodiment of the present invention is an electrolyte for micro-arc oxidation treatment of a high thermal conductivity magnesium alloy, wherein the electrolyte is an aqueous solution containing sodium silicate and sodium phosphate.
In addition, another embodiment of the present invention is a micro-arc oxidation method of a high thermal conductivity magnesium alloy, characterized in that,
connecting the high-thermal conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, and immersing the high-thermal conductivity magnesium alloy and the stainless steel in electrolyte for micro-arc oxidation treatment, wherein the electrolyte is the electrolyte.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the invention, through improving the components of the electrolyte, the sodium silicate and the sodium phosphate are added into the electrolyte at the same time, the point discharge in the micro-arc oxidation treatment of the high-thermal conductivity magnesium alloy can be effectively inhibited, the good film forming quality is realized on the high-thermal conductivity magnesium alloy, and the high film thickness and the good porosity are obtained, so that the good corrosion resistance is realized.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to those embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been omitted from the description in order not to obscure or obscure the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention relates to an electrolyte which is used in micro-arc oxidation treatment of a high-thermal conductivity magnesium alloy, and the electrolyte is an aqueous solution containing sodium silicate and sodium phosphate.
Preferably, in the electrolyte, the mass ratio of the sodium silicate to the sodium phosphate is 6-12.
Preferably, the concentration of the sodium silicate in the electrolyte is 10 g/L-18 g/L.
Therefore, better film quality can be obtained by reasonably designing the mass ratio and the concentration of the sodium silicate and the sodium phosphate.
Preferably, the electrolyte further contains glycerin and ethylene glycol as additives. The addition of glycerol to the electrolyte can inhibit the point discharge of the magnesium alloy. However, if only glycerin is added, the effect of suppressing the tip discharge is weak when the concentration of glycerin is low, and when the concentration of glycerin is high, the surface of the magnesium alloy may be covered due to low solubility of glycerin in water, which may adversely affect the micro-arc oxidation treatment of the magnesium alloy. In contrast, in the invention, the glycerol and the ethylene glycol are added as the additives, so that the solubility of the glycerol in the electrolyte can be effectively improved, the point discharge of the high-thermal-conductivity magnesium alloy during micro-arc oxidation treatment can be effectively inhibited, and the adverse effect on the micro-arc oxidation treatment of the high-thermal-conductivity magnesium alloy can be avoided.
Preferably, in the electrolyte, the volume ratio of the glycerol to the hexanediol is 2.
Preferably, the concentration of the glycerol in the electrolyte is 2mL/L to 5mL/L.
Therefore, better film quality can be obtained by reasonably designing the volume ratio and concentration of the glycerol to the hexanediol.
Preferably, the glycerol concentration increases with increasing concentration of the sodium silicate and decreases with decreasing concentration of the sodium silicate. Here, the correspondence relationship between the glycerin concentration and the sodium silicate concentration may be a linear relationship or a nonlinear relationship. Within the above concentration range, the glycerin concentration may be increased as the sodium silicate concentration increases and decreased as the sodium silicate concentration decreases. Therefore, the concentration of the glycerol can be reasonably selected according to the concentration of the sodium silicate, and better film quality can be obtained.
In addition, although the electrolyte of the present invention is described in the present invention as being used in the micro-arc oxidation treatment of a high thermal conductivity magnesium alloy, the electrolyte of the present invention can also be used in the micro-arc oxidation treatment of a general magnesium alloy.
In addition, the invention also relates to a micro-arc oxidation method of the magnesium alloy with high thermal conductivity. In the method, the high-thermal conductivity magnesium alloy is connected with an anode of a pulse power supply, stainless steel is connected with a cathode of the pulse power supply, the high-thermal conductivity magnesium alloy and the stainless steel are immersed in electrolyte, then the pulse power supply is switched on, and the high-thermal conductivity magnesium alloy is subjected to micro-arc oxidation treatment, wherein the electrolyte is the electrolyte.
Preferably, the pulse power supply is a bipolar constant voltage power supply, the positive voltage is 460V-530V, the frequency is 800HZ, the positive duty ratio is 25% -50%, the negative voltage is 40V, and the negative duty ratio is 30% -45%.
In addition, the higher the positive voltage, the thicker the film thickness can be obtained. However, the point discharge of the high thermal conductivity magnesium alloy is more serious as the positive voltage is increased, thereby seriously affecting the quality of the film. Thus, preferably, the positive voltage of the pulse power source is 460V to 530V, and the higher the positive voltage is, the higher the concentration of the glycerin is. Therefore, when the positive voltage is increased, the concentration of glycerin can be increased (the concentration of ethylene glycol is increased correspondingly), the point discharge of the high-thermal conductivity magnesium alloy can be suppressed by the high-concentration glycerin, and a thicker film thickness can be obtained by a higher positive voltage, thereby realizing better corrosion resistance.
Preferably, the temperature of the electrolyte is 20 ℃ to 30 ℃ when the micro-arc oxidation treatment is performed.
Therefore, better film quality can be obtained by reasonably designing the electrical parameters of the magnesium alloy with high thermal conductivity during micro-arc oxidation treatment.
The present invention will be further illustrated by the following examples.
Example 1
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 500V, the frequency is 800HZ, the positive duty ratio is 35%, the negative voltage is 40V, and the negative duty ratio is 45%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 8g/L, the concentration of sodium phosphate is 8g/L, and the solvent is water.
Example 2
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 480V, the frequency is 800HZ, the positive duty ratio is 25%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 20g/L, the concentration of sodium phosphate is 8g/L, and the solvent is water.
Example 3
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 510V, the frequency is 800HZ, the positive duty ratio is 25%, the negative voltage is 40V, and the negative duty ratio is 30%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 20 ℃.
In the electrolyte, the concentration of sodium silicate is 10g/L, the concentration of sodium phosphate is 5g/L, and the solvent is water.
Example 4
Connecting the high-thermal conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal conductivity magnesium alloy and the stainless steel in an electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 470V, the frequency is 800HZ, the positive duty ratio is 30%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 20 ℃.
In the electrolyte, the concentration of sodium silicate is 18g/L, the concentration of sodium phosphate is 15g/L, and the solvent is water.
Example 5
Connecting the high-thermal conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal conductivity magnesium alloy and the stainless steel in an electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 460V, the frequency is 800HZ, the positive duty ratio is 50%, the negative voltage is 40V, and the negative duty ratio is 35%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 30 ℃.
In the electrolyte, the concentration of sodium silicate is 12g/L, the concentration of sodium phosphate is 9g/L, the concentration of glycerin is 2mL/L, the concentration of ethylene glycol is 2mL/L, and the solvent is water.
Example 6
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant-voltage power supply, the positive voltage is 4900V, the frequency is 800HZ, the positive duty ratio is 35%, the negative voltage is 40V, and the negative duty ratio is 35%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 30 ℃.
In the electrolyte, the concentration of sodium silicate is 14g/L, the concentration of sodium phosphate is 8g/L, the concentration of glycerol is 3mL/L, the concentration of ethylene glycol is 15mL/L, and the solvent is water.
Example 7
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 520V, the frequency is 800HZ, the positive duty ratio is 30%, the negative voltage is 40V, and the negative duty ratio is 45%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 16g/L, the concentration of sodium phosphate is 10g/L, the concentration of glycerol is 4mL/L, the concentration of ethylene glycol is 10mL/L, and the solvent is water.
Example 8
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 530V, the frequency is 800HZ, the positive duty ratio is 40%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 18g/L, the concentration of sodium phosphate is 11g/L, the concentration of glycerin is 5mL/L, the concentration of ethylene glycol is 10mL/L, and the solvent is water.
Example 9
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant-voltage power supply, the positive voltage is 460V, the frequency is 800HZ, the positive duty ratio is 35%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 30 ℃.
In the electrolyte, the concentration of sodium silicate is 12g/L, the concentration of sodium phosphate is 5g/L, the concentration of glycerin is 2mL/L, the concentration of ethylene glycol is 3mL/L, and the solvent is water.
Comparative example 1
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 530V, the frequency is 800HZ, the positive duty ratio is 40%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 18g/L, and the solvent is water.
Comparative example 2
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant voltage power supply, the positive voltage is 530V, the frequency is 800HZ, the positive duty ratio is 40%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium phosphate is 11g/L, and the solvent is water.
Comparative example 3
Connecting the high-thermal-conductivity magnesium alloy with the anode of a pulse power supply, connecting stainless steel with the cathode of the pulse power supply, immersing the high-thermal-conductivity magnesium alloy and the stainless steel in electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal-conductivity magnesium alloy. The pulse power supply is a bipolar constant-voltage power supply, the positive voltage is 530V, the frequency is 800HZ, the positive duty ratio is 40%, the negative voltage is 40V, and the negative duty ratio is 40%.
When the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 25 ℃.
In the electrolyte, the concentration of sodium silicate is 18g/L, the concentration of sodium phosphate is 11g/L, the concentration of glycerol is 5mL/L, and the solvent is water.
In the above examples, glycerin and ethylene glycol were not added as additives to the electrolytes of examples 1 to 4. In the electrolytes of examples 5 to 9, glycerin and ethylene glycol were contained as additives in addition to sodium silicate and sodium phosphate, and the concentration of glycerin increased as the concentration of sodium silicate increased. And three comparative examples were designed on the basis of example 8. In comparative example 1, only a sodium silicate solution was used as an electrolyte, in comparative example 2, only a sodium phosphate solution was used as an electrolyte, and in comparative example 3, sodium silicate and sodium phosphate were contained in the electrolyte in the same concentration and ratio as in example 8, but only glycerin was added as an additive and ethylene glycol was not added. The film formation conditions of examples 1 to 9 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1
| Film formation status | |
| Example 1 | The film has moderate quality, pores, a few cracks and moderate thickness. |
| Example 2 | The film has moderate quality, pores, a few cracks and moderate thickness. |
| Example 3 | The film has good quality, few pores, a few cracks and medium thickness. |
| Example 4 | The film has good quality, few pores, a few cracks and medium thickness. |
| Example 5 | The film has good quality, few pores, no cracks and medium thickness. |
| Example 6 | The film has good quality, few pores, no cracks and moderate thickness. |
| Example 7 | The film has high quality, few pores, no cracks and thicker film. |
| Example 8 | The film has high quality, few pores, no cracks and thicker film. |
| Example 9 | The film has high quality, few pores, no cracks and thicker film. |
| Comparative example 1 | A protective film could not be formed on the surface of the magnesium alloy. |
| Comparative example 2 | The protective film could not be formed on the surface of the magnesium alloy. |
| Comparative example 3 | The film has low quality, many pores, cracks and thinner film. |
As can be seen from table 1, when the electrolyte solution contains only sodium silicate or sodium phosphate (comparative examples 1 to 2), a protective film cannot be formed on the surface of the high thermal conductivity magnesium alloy, and when the electrolyte solution contains both sodium silicate and sodium phosphate (examples 1 to 9), a protective film can be formed on the surface of the high thermal conductivity magnesium alloy, thereby improving the corrosion resistance of the high thermal conductivity magnesium alloy. When the mass ratio of the sodium silicate to the sodium phosphate is 6-12.
In addition, when glycerol and ethylene glycol were added as additives to the electrolyte (examples 5 to 9), the quality of the film layer could be further improved. Further, when the volume ratio of glycerin to hexanediol is 2 to 2.
Meanwhile, if only glycerin is added at a higher concentration without adding ethylene glycol (comparative example 3), the quality of the film layer is not improved but is severely degraded.
The embodiments of the present invention have been described above, but the embodiments are merely examples and are not intended to limit the scope of the present invention. These embodiments may be implemented in other various forms, and various omissions, substitutions, changes, and combinations may be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and spirit of the present invention, and are also included in the invention described in the claims and the scope equivalent thereto.
Claims (10)
1. An electrolyte used in micro-arc oxidation treatment of a high thermal conductivity magnesium alloy, the electrolyte being characterized in that,
the electrolyte is an aqueous solution containing sodium silicate and sodium phosphate.
2. The electrolyte of claim 1,
in the electrolyte, the mass ratio of the sodium silicate to the sodium phosphate is (6-12).
3. The electrolyte of claim 1,
in the electrolyte, the concentration of the sodium silicate is 10-18 g/L.
4. The electrolyte of claim 1,
the electrolyte also contains glycerol and ethylene glycol as additives.
5. The electrolyte of claim 4,
in the electrolyte, the volume ratio of the glycerol to the hexanediol is from 2 to 3.
6. The electrolyte of claim 4,
in the electrolyte, the concentration of the glycerol is 2 mL/L-5 mL/L.
7. The electrolyte of claim 4,
the glycerol concentration increases with increasing sodium silicate concentration and decreases with decreasing sodium silicate concentration.
8. A micro-arc oxidation method of magnesium alloy with high thermal conductivity is characterized in that,
connecting the high-thermal conductivity magnesium alloy with an anode of a pulse power supply, connecting stainless steel with a cathode of the pulse power supply, immersing the high-thermal conductivity magnesium alloy and the stainless steel in an electrolyte, and then switching on the pulse power supply to perform micro-arc oxidation treatment on the high-thermal conductivity magnesium alloy, wherein the electrolyte is the electrolyte in any one of claims 1-7.
9. The method of micro-arc oxidation of a magnesium alloy with high thermal conductivity according to claim 8,
the positive voltage of the pulse power supply is 460V-530V,
in the electrolyte, the concentration of the glycerol is 2 mL/L-5 mL/L,
the higher the positive voltage, the higher the concentration of the glycerol.
10. The method for micro-arc oxidation of a magnesium alloy with high thermal conductivity according to claim 8,
when the micro-arc oxidation treatment is carried out, the temperature of the electrolyte is 20-30 ℃.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400197.8A CN115198331A (en) | 2021-04-14 | 2021-04-14 | Electrolyte and micro-arc oxidation method of high-thermal-conductivity magnesium alloy |
| PCT/JP2022/015401 WO2022220099A1 (en) | 2021-04-14 | 2022-03-29 | Electrolyte, and micro arc oxidation method for highly thermally conductive magnesium alloy |
| JP2023514572A JPWO2022220099A1 (en) | 2021-04-14 | 2022-03-29 | |
| DE112022001013.4T DE112022001013T5 (en) | 2021-04-14 | 2022-03-29 | ELECTROLYTE AND MICRO-ARC OXIDATION PROCESS FOR HIGHLY HEAT-CONDUCTIVE MAGNESIUM ALLOY |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400197.8A CN115198331A (en) | 2021-04-14 | 2021-04-14 | Electrolyte and micro-arc oxidation method of high-thermal-conductivity magnesium alloy |
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| CN115198331A true CN115198331A (en) | 2022-10-18 |
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| Country | Link |
|---|---|
| JP (1) | JPWO2022220099A1 (en) |
| CN (1) | CN115198331A (en) |
| DE (1) | DE112022001013T5 (en) |
| WO (1) | WO2022220099A1 (en) |
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| SG2013020532A (en) * | 2013-03-20 | 2014-10-30 | Singapore Polytechnic | Method of forming a coating on a metal substrate |
| CN104694993A (en) * | 2013-12-06 | 2015-06-10 | 中国科学院兰州化学物理研究所 | Process for preparing high-light-absorption-rate black ceramic film layer through micro-arc oxidation of surface of magnesium alloy |
| JP2016156036A (en) * | 2015-02-23 | 2016-09-01 | 株式会社栗本鐵工所 | Coating formation method |
| CN107435159A (en) * | 2016-05-02 | 2017-12-05 | 纳米及先进材料研发院有限公司 | Use the alloy surface colors countenance of micro-arc oxidation process |
| CN107460524B (en) * | 2017-08-16 | 2019-08-16 | 北方民族大学 | Differential arc oxidation prepares the solution formula and technique of magnesium and the Mg alloy surface coating containing tantalum |
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