CN114525568A - Cr-modified nano diamond wear-resistant coating - Google Patents
Cr-modified nano diamond wear-resistant coating Download PDFInfo
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- CN114525568A CN114525568A CN202210155107.8A CN202210155107A CN114525568A CN 114525568 A CN114525568 A CN 114525568A CN 202210155107 A CN202210155107 A CN 202210155107A CN 114525568 A CN114525568 A CN 114525568A
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- diamond
- resistant coating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
- C01B32/28—After-treatment, e.g. purification, irradiation, separation or recovery
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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- General Life Sciences & Earth Sciences (AREA)
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- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Carbon And Carbon Compounds (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The preparation method of the Cr-modified nano diamond wear-resistant coating comprises the following steps: calcining the modified diamond nanoparticles; preparing an electro-chromic solution by using the obtained modified diamond particles; and electroplating the metal substrate by using the electroplating solution prepared above to form the wear-resistant coating. The content of diamond in the coating formed according to the invention is greatly improved, thereby reducing the loss rate of the nano-diamond and enhancing the strength of the coating. The invention can obviously reduce the cost and prolong the service life of the used components.
Description
Technical Field
The present invention relates to a method of forming a wear-resistant coating on a metal substrate, particularly a copper substrate.
Background
The chrome electroplating technology is widely used for surface processing of a mold, and improves the surface hardness of a device, prevents rust and prolongs the service life of a coated part by forming a wear-resistant coating on the surface of the mold. The surface of the material is smooth, bright and clean, difficult to rust, hard in texture and the like, and the material is widely used for processing electronic products, easily-worn devices and the like. Diamond itself has excellent physical and mechanical properties with high hardness, making it an important tool for machining hard devices. However, the traditional nano-diamond plating solution has poor dispersibility, is easy to generate agglomeration, has low nano-diamond content in a plating layer, wastes a large amount of diamonds in the processing process and has low utilization rate.
Disclosure of Invention
The object of the present invention is to provide a Cr/diamond composite wear resistant coating in which the diamond content is significantly increased and thus the wear resistance is improved.
According to a first aspect of the present invention, there is provided a method of forming a wear-resistant plating layer on a copper substrate, comprising:
providing diamond nanoparticles;
calcining the diamond particles in an air atmosphere to obtain modified diamond particles, wherein the calcining temperature is 420-430 ℃, the heating rate is 3-10 ℃/min, and the calcining time is 2-8 h;
preparing an electroplating solution: chromic anhydride 200-300 g/L; 1-10 g/L of chromium sesquioxide; 1-5 g/L of sulfuric acid; 3-10 g/L of modified diamond particles; and
the wear-resistant coating is electroplated on the copper substrate serving as the cathode by adopting the electroplating solution with the configuration, wherein the temperature of the electroplating solution is 50-60 ℃, the current density of the cathode is 0.2-0.4A/cm 2, and the electroplating time is 5-10 h.
According to the method of the invention, the anode used in electroplating can be metal platinum, and the electrode distance is preferably about 1 cm.
The method according to the present invention, wherein the average particle size of the diamond nanoparticles is preferably around 100nm or less.
According to the method of the present invention, the content of the modified diamond particles in the plating solution is preferably about 5 g/L.
The diamond nanoparticles used may be made by any suitable method such as, but not limited to, detonation.
According to a second aspect of the present invention there is provided a mould part comprising a copper substrate and a wear resistant coating formed on the copper substrate, wherein the wear resistant coating is formed by the method described above.
The thickness of the wear-resistant coating may be about 500 microns.
According to the invention, firstly, the diamond nanoparticles are calcined and modified to obtain (carboxylated) diamond with improved hydrophilicity, then the (carboxylated) diamond is used for preparing the electroplating solution, and a Cr-modified nano diamond coating is electroplated on a metal substrate, particularly a copper substrate, by adopting a specific electroplating condition. The content of diamond in the coating formed according to the invention is greatly increased, thereby reducing the loss rate of nano-diamond and enhancing the strength of the coating. The invention thus enables a significant cost reduction and an extension of the service life of the components used, for example of the mould components.
Drawings
Fig. 1 is an SEM image of a Cr-modified nanodiamond coating on a copper substrate surface formed according to example 1 of the present invention.
Fig. 2 is an SEM image of a Cr-modified nanodiamond coating on a copper substrate surface formed according to example 2 of the present invention.
Fig. 3 is an SEM image of a Cr-nanodiamond plating layer on a copper substrate surface formed according to a comparative example.
Detailed Description
The present invention is further illustrated by the following specific examples and comparative examples. It is to be understood by persons skilled in the art that the following is illustrative only and not limiting of the invention.
Example 1
Forming a Cr-modified nanodiamond coating on a copper substrate
S1, placing the diamond nano particles with the average particle size of 100nm in an air atmosphere for calcination treatment to obtain modified diamond particles, wherein the calcination temperature is 425 ℃, the heating rate is 5 ℃/min, and the calcination time is 5 h;
s2 preparing electroplating solution: 225g/L of chromic anhydride; 5g/L of chromic oxide; 2.3g/L of sulfuric acid; 3g/L of modified diamond particles;
s3 adopts the electroplating solution prepared in S2, copper substrate as cathode, metal platinum as anode, electrode distance of 1cm, and cathode current density of 0.3A/cm2And electroplating for 6 hours at 55 ℃ to obtain a Cr-modified nano diamond coating on the copper substrate.
The SEM image of the surface micro-topography of the coating obtained in the example is shown in FIG. 1, and the surface is relatively dense and flat.
Example 2
Forming a Cr-modified nanodiamond coating on a copper substrate
The content of modified diamond particles in the plating solution was adjusted to 5g/L, and the procedure of example 1 was otherwise repeated.
The SEM image of the surface micro-topography of the coating obtained in this example is shown in FIG. 2, and the surface is more compact and flat compared with example 1.
Comparative example
Forming Cr-nanodiamond coating on copper substrate
The diamond nanoparticles were used directly to prepare an electroplating solution without calcination modification, otherwise the same as in example 2.
The SEM image of the surface micro-morphology of the coating obtained in the comparative example is shown in FIG. 3, and the surface is dense and flat.
The diamond content of the coatings obtained in example 1, example 2 and comparative example were measured, respectively, and the measured data obtained after subtracting the blank samples are shown in table 1. The comparison shows that the content of diamond in the plating layer is increased along with the increase of the concentration of the nano diamond in the plating solution. Comparing example 2 with the comparative example, it can be seen that: after the nano-diamond is subjected to calcination modification treatment, the content of diamond in the coating can be obviously improved.
TABLE 1 diamond content in coating samples obtained in examples and comparative examples
| Coating sample | Diamond content wt% |
| Example 1 | 0.00906 |
| Example 2 | 0.13559 |
| Comparative example | 0.05417 |
Claims (6)
1. A method of forming a wear-resistant coating on a copper substrate, comprising:
providing diamond nanoparticles;
calcining the diamond particles in an air atmosphere to obtain modified diamond particles, wherein the calcining temperature is 420-430 ℃, the heating rate is 3-10 ℃/min, and the calcining time is 2-8 h;
preparing an electroplating solution: chromic anhydride 200-300 g/L; 1-10 g/L of chromium sesquioxide; 1-5 g/L of sulfuric acid; 3-10 g/L of modified diamond particles; and
the wear-resistant coating is electroplated on the copper substrate serving as the cathode by adopting the electroplating solution with the configuration, wherein the temperature of the electroplating solution is 50-60 ℃, the current density of the cathode is 0.2-0.4A/cm 2, and the electroplating time is 5-10 h.
2. The method according to claim 1, wherein the anode used in the electroplating is platinum metal, and the electrode pitch is about 1 cm.
3. A method according to claim 1, wherein the diamond nanoparticles have an average particle size of around 100 nm.
4. The method according to claim 1, wherein the content of the modified diamond particles in the plating solution is about 5 g/L.
5. A mold part comprising a copper substrate and a wear-resistant coating formed on the copper substrate, wherein the wear-resistant coating is formed by the method according to any one of claims 1 to 4.
6. A mould part according to claim 5 wherein the wear resistant coating has a thickness of around 500 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210155107.8A CN114525568A (en) | 2022-02-21 | 2022-02-21 | Cr-modified nano diamond wear-resistant coating |
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| CN202210155107.8A CN114525568A (en) | 2022-02-21 | 2022-02-21 | Cr-modified nano diamond wear-resistant coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747906A (en) * | 2022-11-28 | 2023-03-07 | 国网重庆市电力公司电力科学研究院 | Anti-corrosion metal material and preparation method thereof |
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| CN1036607A (en) * | 1988-02-11 | 1989-10-25 | 亚力山大·伊万诺维奇·舍巴林 | The method for preparing composite coating based on chromium |
| US20010033804A1 (en) * | 2000-02-10 | 2001-10-25 | An Jung Soo | Abrasive dressing tool and method for manufacturing the tool |
| CN101498256A (en) * | 2009-03-04 | 2009-08-05 | 仪征双环活塞环有限公司 | Chromium based diamond composite chrome plating coating piston ring and method of processing the same |
| CN202482465U (en) * | 2012-03-02 | 2012-10-10 | 梅河口市兴业精密钢管有限公司 | Nanometer diamond micro powder composite chromium plating pump cylinder |
| CN104233435A (en) * | 2014-09-09 | 2014-12-24 | 上海交通大学 | Preparation method of convex hull-like wear-resistant chrome-plated layer strengthened by spherical particles |
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| CN108179448A (en) * | 2018-01-11 | 2018-06-19 | 河南工业大学 | It is a kind of to improve the plating diamond coat of metal and the method for diamond interface bond strength |
-
2022
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| US20010033804A1 (en) * | 2000-02-10 | 2001-10-25 | An Jung Soo | Abrasive dressing tool and method for manufacturing the tool |
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| CN202482465U (en) * | 2012-03-02 | 2012-10-10 | 梅河口市兴业精密钢管有限公司 | Nanometer diamond micro powder composite chromium plating pump cylinder |
| CN104233435A (en) * | 2014-09-09 | 2014-12-24 | 上海交通大学 | Preparation method of convex hull-like wear-resistant chrome-plated layer strengthened by spherical particles |
| CN106119909A (en) * | 2016-08-30 | 2016-11-16 | 天津商业大学 | Nickel Nano diamond wear-resisting strengthening composite coating method is prepared with the pulse power |
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| CN115747906A (en) * | 2022-11-28 | 2023-03-07 | 国网重庆市电力公司电力科学研究院 | Anti-corrosion metal material and preparation method thereof |
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