CN114703525B - Preparation method of wear-resistant coating on aluminum surface - Google Patents
Preparation method of wear-resistant coating on aluminum surface Download PDFInfo
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- CN114703525B CN114703525B CN202210378831.7A CN202210378831A CN114703525B CN 114703525 B CN114703525 B CN 114703525B CN 202210378831 A CN202210378831 A CN 202210378831A CN 114703525 B CN114703525 B CN 114703525B
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- arc oxidation
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 40
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- 239000003792 electrolyte Substances 0.000 claims abstract description 28
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 19
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 19
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 18
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 18
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 10
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 10
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 10
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 10
- 238000005299 abrasion Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 231100000252 nontoxic Toxicity 0.000 abstract description 3
- 230000003000 nontoxic effect Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000004506 ultrasonic cleaning Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229940057838 polyethylene glycol 4000 Drugs 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000000758 substrate Substances 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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)
- Chemical Treatment Of Metals (AREA)
- Lubricants (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a preparation method of an aluminum surface wear-resistant coating, which comprises the following steps: sequentially dissolving sodium hexametaphosphate, sodium silicate, sodium hydroxide, polyethylene glycol and polyvinyl alcohol in deionized water, and mixing to obtain an electrolyte; and placing the aluminum sample in electrolyte, connecting the anode of a micro-arc oxidation power supply, performing micro-arc oxidation, and forming a wear-resistant coating on the surface of the aluminum. Polyethylene glycol/polyvinyl alcohol is crosslinked in electrolyte to form a sol-gel network, so that the occurrence condition of micro-arc oxidation can be reduced, the micro-arc oxidation reaction is aggravated to a certain extent, and the friction and wear performance of the coating is further improved; the average friction coefficient of the obtained micro-arc oxidation coating is 0.588, and the micro-arc oxidation coating has good wear resistance; the preparation raw materials are easy to obtain and nontoxic, and can be prepared in large scale.
Description
Technical Field
The invention belongs to the technical field of material surface treatment methods, and relates to a preparation method of an aluminum surface wear-resistant coating.
Background
The metal aluminum has high content in nature and is easy to obtain, and the aluminum and the alloy thereof have the excellent properties of low density, good electrical conductivity and thermal conductivity, good toughness, easy molding and the like. Therefore, it is widely used in the fields of aerospace, automobiles, construction and the like. However, in the practical use process, the strength, corrosion resistance and friction performance of the alloy are often not up to the practical use requirements, which greatly influences the application range of the alloy. It is important to improve the wear and corrosion resistance of the aluminum surface for subsequent practical use of the aluminum.
In recent years, it has been found that wear and corrosion resistance can be increased by surface modification to create a protective coating that prevents the substrate from being in direct contact with the external environment. Micro-arc oxidation, also known as plasma electrolytic oxidation, is a surface modification technology developed on the basis of anodic oxidation. The electrolyte is matched with current parameters, and discharge arc is started on the surface of a matrix to reach high temperature and high pressure, so that a ceramic coating closely combined with the matrix grows on the surface of valve metals such as aluminum, magnesium, titanium and the like. However, the micro-arc oxidation process is not stable, and the formed micro-arc oxidation coating does not necessarily have strong wear resistance.
Disclosure of Invention
The invention aims to provide a preparation method of an aluminum surface wear-resistant coating, which solves the problem of poor wear resistance of a micro-arc oxidation coating in the prior art.
The technical scheme adopted by the invention is that the preparation method of the wear-resistant coating on the aluminum surface comprises the following steps:
step 1, sequentially dissolving sodium hexametaphosphate, sodium silicate, sodium hydroxide, polyethylene glycol and polyvinyl alcohol in deionized water, and mixing to obtain electrolyte;
and 2, placing an aluminum sample in electrolyte, connecting the anode of a micro-arc oxidation power supply, and performing micro-arc oxidation to form an abrasion-resistant coating on the surface of the aluminum.
The invention is also characterized in that:
in the electrolyte, the following components: the concentration of sodium hexametaphosphate is 20-40g/L, the concentration of sodium silicate is 2-5g/L, the concentration of sodium hydroxide is 0.5-3g/L, the concentration of polyethylene glycol is 1-5g/L, and the concentration of polyvinyl alcohol is 1-5g/L.
The micro-arc oxidation process is carried out in two sections, a constant current mode is used, and the power supply parameters are as follows:
the first section: duty ratio 20%, frequency 200-600HZ, forward current 5-10A/dm 2 The negative current is zero; and a second section: duty ratio 20%, frequency 200-600HZ, forward current 1-2A/dm 2 Negative current of 0.5-2A/dm 2 。
The molecular weight of polyethylene glycol is 400-4000, and the molecular weight of polyvinyl alcohol is 70000-90000.
The temperature of the micro-arc oxidation process is 20-70 ℃.
The beneficial effects of the invention are as follows:
according to the preparation method of the wear-resistant coating on the aluminum surface, polyethylene glycol/polyvinyl alcohol is crosslinked in the electrolyte to form a sol-gel network, so that the occurrence condition of micro-arc oxidation can be reduced, the micro-arc oxidation reaction is aggravated to a certain extent, and the friction and wear performance of the coating is further improved; the average friction coefficient of the obtained micro-arc oxidation coating is 0.588, and the micro-arc oxidation coating has good wear resistance; the preparation raw materials are easy to obtain and nontoxic, and can be prepared in large scale.
Drawings
FIG. 1 is a graph comparing the friction coefficients of the coating obtained in example 1 in the method for preparing an aluminum surface wear-resistant coating according to the present invention;
FIG. 2 is a graph comparing the abrasion of the coating obtained in example 1 in the method of producing an aluminum surface abrasion-resistant coating according to the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The preparation method of the wear-resistant coating on the aluminum surface comprises the following steps:
step 1, sequentially dissolving 20-40g of sodium hexametaphosphate, 2-5g of sodium silicate, 0.5-3g of sodium hydroxide, 1-5g of polyethylene glycol and 1-5g of polyvinyl alcohol in 1L of deionized water, and mixing to obtain electrolyte; wherein the molecular weight of polyethylene glycol is 400-4000, and the molecular weight of polyvinyl alcohol is 70000-90000; in the electrolyte, polyethylene glycol/polyvinyl alcohol is crosslinked in the electrolyte to form a sol-gel network;
step 2, placing an aluminum sample in electrolyte, connecting an anode of a micro-arc oxidation power supply, performing micro-arc oxidation in two sections at the temperature of 20-70 ℃, and using a constant current mode, wherein the power supply parameters are as follows: the first section: duty ratio 20%, frequency 200-600HZ, forward current 5-10A/dm 2 The negative current is zero; and a second section: duty ratio 20%, frequency 200-600HZ, forward current 1-2A/dm 2 Negative current of 0.5-2A/dm 2 The method comprises the steps of carrying out a first treatment on the surface of the And after the micro-arc oxidation is finished, forming a wear-resistant coating on the surface of the aluminum.
Through the mode, according to the preparation method of the aluminum surface wear-resistant coating, polyethylene glycol/polyvinyl alcohol is crosslinked in electrolyte to form a sol-gel network, so that the occurrence condition of micro-arc oxidation can be reduced, the micro-arc oxidation reaction is aggravated to a certain extent, and the frictional wear performance of the coating is further improved; the micro-arc oxidation coating and a bearing steel ball (diameter is 9.525 mm) are subjected to a tribological test, and the average friction coefficient of the prepared micro-arc oxidation coating is 0.588 under the conditions of 5N load and sliding speed of 20mm/s and no lubricant, and the prepared micro-arc oxidation coating has good wear resistance; the preparation raw materials are easy to obtain and nontoxic, and can be prepared in large scale.
Example 1
Sequentially dissolving 35g of sodium hexametaphosphate, 4g of sodium silicate, 1g of sodium hydroxide, 3g of polyethylene glycol 4000 and 1g of polyvinyl alcohol 75000 in 1L of deionized water, and mixing to obtain an electrolyte; placing the cleaned pure aluminum disc in electrolyte, wherein the pure aluminum disc serves as an anode connected with the anode of a micro-arc oxidation power supply, stainless steel serves as a cathode, performing micro-arc oxidation in two sections at 20 ℃, and having a duty ratio of 20%, a frequency of 600HZ and a forward current of 10A/dm in the first section 2 The duration is 10min, and the negative current is zero; second-stage forward current 2A/dm 2 Negative current of 1A/dm 2 The duration is 5min; after the micro-arc oxidation is finished, an abrasion-resistant coating is formed on the surface of the aluminum, and finally, the sample is sequentially subjected to ultrasonic cleaning by deionized water and acetone. The samples obtained in this example were subjected to tribology experiments on a friction machine and bearing steel balls, with a load of 5N, a speed of 20mm/s, an experimental duration of 15min, and data recorded. And comparing with micro-arc oxidation samples obtained by adding no polyethylene glycol-polyvinyl alcohol sol and polyethylene glycol alone in the electrolyte, and drawing a friction curve, as shown in figure 1, it can be obviously seen from the figure that the friction coefficient of a micro-arc oxidation disc added with polyethylene glycol/polyvinyl alcohol sol is lower than that of a pure aluminum disc, a sol not added and polyethylene glycol added. Fig. 2 (1) - (4) are abrasion pictures of four kinds of discs after dry friction, namely a pure aluminum disc, a disc without sol solution added in electrolyte, a disc with polyethylene glycol added in electrolyte, and a disc with sol solution added in electrolyte, in order from left to right. As can be seen from fig. 2, the aluminum disk obtained in this example does not expose the matrix after abrasion, and is excellent in abrasion resistance.
Example 2
Sequentially dissolving 35g of sodium hexametaphosphate, 5g of sodium silicate, 0.5g of sodium hydroxide, 3g of polyethylene glycol 400 and 1g of polyvinyl alcohol 70000 in 1L of deionized water, and mixing to obtain an electrolyte; placing the cleaned pure aluminum disc in electrolyte, wherein the pure aluminum disc serves as an anode connected with the anode of a micro-arc oxidation power supply, stainless steel serves as a cathode, performing micro-arc oxidation in two sections at 30 ℃, and performing forward electric on the first section, wherein the duty ratio is 20%, the frequency is 200HZStream 8A/dm 2 The duration is 10min, and the negative current is zero; the forward current of the second section is 1A/dm 2 Negative current of 0.5A/dm 2 The duration is 5min; after the micro-arc oxidation is finished, an abrasion-resistant coating is formed on the surface of the aluminum, and finally, the sample is sequentially subjected to ultrasonic cleaning by deionized water and acetone.
Example 3
Sequentially dissolving 20g of sodium hexametaphosphate, 4g of sodium silicate, 3g of sodium hydroxide, 1g of polyethylene glycol 10000 and 5g of polyvinyl alcohol 90000 in 1L of deionized water, and mixing to obtain an electrolyte; placing the cleaned pure aluminum disc in electrolyte, wherein the pure aluminum disc serves as an anode connected with the anode of a micro-arc oxidation power supply, stainless steel serves as a cathode, performing micro-arc oxidation in two sections at 20 ℃, and having a duty ratio of 20%, a frequency of 600HZ and a forward current of 5A/dm in the first section 2 The duration is 10min, and the negative current is zero; second-stage forward current 2A/dm 2 The negative current is 2A/dm 2 The duration is 5min; after the micro-arc oxidation is finished, an abrasion-resistant coating is formed on the surface of the aluminum, and finally, the sample is sequentially subjected to ultrasonic cleaning by deionized water and acetone.
Example 4
Sequentially dissolving 40g of sodium hexametaphosphate, 2g of sodium silicate, 0.5g of sodium hydroxide, 1g of polyethylene glycol 4000 and 1g of polyvinyl alcohol 70000 in 1L of deionized water, and mixing to obtain an electrolyte; placing the cleaned pure aluminum disc in electrolyte, wherein the pure aluminum disc serves as an anode connected with the anode of a micro-arc oxidation power supply, stainless steel serves as a cathode, performing micro-arc oxidation in two sections at 70 ℃, and having a duty ratio of 20%, a frequency of 500HZ and a forward current of 5A/dm in the first section 2 The duration is 10min, and the negative current is zero; the forward current of the second section is 1A/dm 2 Negative current of 0.5A/dm 2 The duration is 5min; after the micro-arc oxidation is finished, an abrasion-resistant coating is formed on the surface of the aluminum, and finally, the sample is sequentially subjected to ultrasonic cleaning by deionized water and acetone.
Claims (1)
1. The preparation method of the wear-resistant coating on the aluminum surface is characterized by comprising the following steps of:
step 1, sequentially dissolving sodium hexametaphosphate, sodium silicate, sodium hydroxide, polyethylene glycol and polyvinyl alcohol in deionized water, and mixing to obtain electrolyte;
step 2, placing an aluminum sample in electrolyte, connecting an anode of a micro-arc oxidation power supply, performing micro-arc oxidation, and forming an abrasion-resistant coating on the surface of aluminum;
the electrolyte comprises the following components: sodium hexametaphosphate with concentration of 20-40g/L, sodium silicate with concentration of 2-5g/L, sodium hydroxide with concentration of 0.5-3g/L, polyethylene glycol with concentration of 1-5g/L and polyvinyl alcohol with concentration of 1-5g/L;
the micro-arc oxidation process is carried out in two sections, a constant current mode is used, and the power supply parameters are as follows:
the first section: duty ratio 20%, frequency 200-600HZ, forward current 5-10A/dm 2 The negative current is zero; and a second section: duty ratio 20%, frequency 200-600HZ, forward current 1-2A/dm 2 Negative current of 0.5-2A/dm 2 ；
The molecular weight of the polyethylene glycol is 400-4000, and the molecular weight of the polyvinyl alcohol is 70000-90000;
the temperature of the micro-arc oxidation process is 20-70 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210378831.7A CN114703525B (en) | 2022-04-12 | 2022-04-12 | Preparation method of wear-resistant coating on aluminum surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210378831.7A CN114703525B (en) | 2022-04-12 | 2022-04-12 | Preparation method of wear-resistant coating on aluminum surface |
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| CN114703525A CN114703525A (en) | 2022-07-05 |
| CN114703525B true CN114703525B (en) | 2024-01-26 |
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| CN202210378831.7A Active CN114703525B (en) | 2022-04-12 | 2022-04-12 | Preparation method of wear-resistant coating on aluminum surface |
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| CN115161745A (en) * | 2022-07-27 | 2022-10-11 | 西安工程大学 | Method for improving micro-arc oxidation surface coating by coating composite gel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130280A (en) * | 2017-05-18 | 2017-09-05 | 含山瑞可金属有限公司 | A kind of titanium alloy connector with wear-resisting lubricant coating |
| CN115161745A (en) * | 2022-07-27 | 2022-10-11 | 西安工程大学 | Method for improving micro-arc oxidation surface coating by coating composite gel |
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- 2022-04-12 CN CN202210378831.7A patent/CN114703525B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130280A (en) * | 2017-05-18 | 2017-09-05 | 含山瑞可金属有限公司 | A kind of titanium alloy connector with wear-resisting lubricant coating |
| CN115161745A (en) * | 2022-07-27 | 2022-10-11 | 西安工程大学 | Method for improving micro-arc oxidation surface coating by coating composite gel |
Non-Patent Citations (1)
| Title |
|---|
| Polyvinyl alcohol/polyethylene glycol composite hydrogel parceling on aluminum: Toward more robust micro-arc oxidation coatings;Jia ED等;Ceramics International;第49卷(第08期);第13081-13091页 * |
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