CN111424303A - SiC nano-silver composite electrodeposition coating and preparation method and application thereof - Google Patents
SiC nano-silver composite electrodeposition coating and preparation method and application thereof Download PDFInfo
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- CN111424303A CN111424303A CN202010424975.2A CN202010424975A CN111424303A CN 111424303 A CN111424303 A CN 111424303A CN 202010424975 A CN202010424975 A CN 202010424975A CN 111424303 A CN111424303 A CN 111424303A
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Abstract
The invention belongs to the technical field of preparation of silicon nitride nano composite surface coatings, and particularly discloses a SiC nano silver composite electrodeposition coating and a preparation method and application thereof. The method comprises the following steps: (1) uniformly mixing the chitosan solution with other cationic dispersants, and then sequentially adding SiC powder and nano silver to obtain a mixed solution; (2) shearing and dispersing the obtained mixed solution to obtain a nano suspension, and then adjusting the pH value to be neutral; (3) putting cathode and anode electrode materials into the obtained nano suspension solution; introducing direct current, and depositing to obtain the SiC nano silver composite coating; the SiC nano silver composite electrodeposition coating provided by the invention can replace an electroplated chromium coating. The coating is simple and quick to prepare, is environment-friendly and pollution-free, has a good protective effect on a substrate material, improves the wear resistance of the material, and solves the problem of the coating of a specific component.
Description
Technical Field
The invention belongs to the technical field of preparation of metal substrate surface coatings, and particularly relates to a SiC nano-silver composite electrodeposition coating, and a preparation method and application thereof.
Background
The electroplated chromium coating is still applied in a large amount in many important industrial fields in China due to the advantages of good finish, high hardness, strong wear resistance and corrosion resistance and the like. However, the problems of environmental pollution, health hazard and the like caused by the chromium electroplating process become chronic diseases for restricting the environment-friendly society in China. The green surface treatment technology for replacing the chromium electroplating provides a breakthrough for solving the problems, but various typical parts in the major industries of vehicle transportation, steel, mine and the like in China still lack the green technology at present. Nano composite electrodeposition is a deposition technique in which one or more insoluble nano solid particles are mixed into a single metal or alloy plating solution by an electrochemical method, and the co-deposition causes the nano particles to be embedded into a matrix coating, so that the solid particles and metal ions are co-deposited to form a nano composite coating. The silicon carbide nano composite coating can improve the wear resistance of the material and is an ideal substitute technology for hard chromium electroplating. The invention aims at preparing the silicon carbide nano-silver composite electrodeposition coating by compounding nano-silver with silicon carbide.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention mainly aims to provide a preparation method of the SiC nano silver composite electrodeposition coating.
The invention also aims to provide the SiC nano-silver composite electrodeposition coating prepared by the method.
The invention further aims to provide application of the SiC nano silver composite electrodeposition coating in a friction-resistant part.
The purpose of the invention is realized by the following scheme:
a preparation method of a SiC nano-silver composite electrodeposition coating comprises the following steps:
(1) uniformly mixing the cationic dispersant A and the cationic dispersant B, and sequentially adding SiC powder and nano silver to obtain a mixed solution;
(2) shearing and dispersing the mixed solution obtained in the step (1) to obtain a nano composite suspension, and then adjusting the pH value to be neutral;
(3) putting cathode and anode electrode materials into the nano suspension solution obtained in the step (2); introducing direct current, and depositing to obtain the SiC nano silver composite coating;
wherein the cationic dispersant A in the step (1) is a chitosan solution, and the cationic dispersant B is at least one of Cetyl Trimethyl Ammonium Bromide (CTAB), Polyetherimide (PEI) and Alkyl Dimethyl Benzyl Ammonium Chloride (ADBAC);
the concentration of the chitosan solution in the step (1) is 0.1-0.5 wt%; preferably 0.2% wt.
The mass-volume ratio of the cationic dispersant B to the cationic dispersant A in the step (1) is 0.01-0.05 g: 25m L.
The concentration of the SiC powder in the mixed solution in the step (1) is 10-20 g/L, the particle size is 30-80nm, the concentration of the nano silver is 1-2 g/L, and the particle size is 10-20 nm.
The shearing dispersion in the step (2) is carried out in a shearing dispersion machine, and the conditions of the shearing dispersion are as follows: the rotating speed of the shearing dispersion machine is 300-500r/min, the rotating speed is adjusted to 1500-2000r/min after the shearing dispersion is carried out for 5-10min, and then the shearing dispersion is carried out for 10-15 min.
The reagent used for the pH to be neutral under the condition of the step (2) is a reagent commonly used in the field, and preferably at least one of NaOH, citric acid, sodium citrate, formic acid, urea, sodium oxalate and ammonium bromide.
The cathode material in the step (3) is titanium alloy, pure titanium or stainless steel; preferably, the cathode material is cleaned, in particular polished to remove oil, and then the surface is wiped with an HF solution before it is used. The anode material is a common inert electrode, and is preferably graphite or platinum sheet.
And (3) the distance between the cathode and the anode in the nano suspension solution is 1-2 cm. The applied voltage range of the direct current in the step (3) is 10-60V, and the current density is 0.01-0.5mA/cm2。
And (4) the deposition time in the step (3) is 1-5 min. Preferably, the nano suspension solution is stirred for 10-30 min before the direct current is introduced for deposition.
The SiC nano-silver composite electrodeposition coating is prepared by the method.
The SiC nano silver composite electrodeposition coating is applied to friction-resistant parts.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the SiC nano silver composite electrodeposition coating provided by the invention can replace an electroplated chromium coating. The coating is simple and quick to prepare, is environment-friendly and pollution-free, has a good protective effect on a substrate material, improves the wear resistance of the material, and solves the problem of the coating of a specific component.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
The reagents used in the examples are commercially available without specific reference. The deacetylation degree of the chitosan is 85-95%.
The SiC nano silver composite coatings in examples 1-6 were prepared using the following method:
(1) the chitosan solution is prepared by mixing 0.5g of chitosan, 0.25m of L glacial acetic acid and 247.5m of L deionized water, and stirring for dissolving for more than 7 h.
(2) Uniformly mixing the chitosan solution and 0.02g of cationic dispersant, then adding 1g of SiC powder (30-80 mu m) and 0.05g of nano silver (10-20nm), and then adding 25m of ethanol L to obtain a mixed solution;
(3) placing the mixed solution obtained in the step (2) on a shearing dispersion machine, wherein the rotating speed of the shearing dispersion machine is 300-;
(4) putting cathode and anode (Pt) electrode materials into the nano suspension solution with the pH value of 7.14 obtained in the step (3), wherein the electrode distance is 1-2 cm; introducing direct current, applying voltage of 40V and current density of 0.01-0.5mA/cm2And depositing for 1-5min to obtain the SiC nano silver composite coating.
TABLE 1 Condition parameters for examples 1-6 and Properties of the coatings obtained
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of a SiC nano-silver composite electrodeposition coating is characterized by comprising the following steps:
(1) uniformly mixing the cationic dispersant A and the cationic dispersant B, and sequentially adding SiC powder and nano silver to obtain a mixed solution;
(2) shearing and dispersing the mixed solution obtained in the step (1) to obtain a nano suspension, and then adjusting the pH value to be neutral;
(3) putting cathode and anode electrode materials into the nano suspension solution obtained in the step (2); introducing direct current, and depositing to obtain the SiC nano silver composite coating;
the cationic dispersant A in the step (1) is a chitosan solution, and the cationic dispersant B is at least one of cetyl trimethyl ammonium bromide, polyetherimide and alkyl dimethyl benzyl ammonium chloride.
2. The method of claim 1, wherein:
the mass-volume ratio of the cationic dispersant B to the cationic dispersant A in the step (1) is 0.01-0.05 g: 25m L.
3. The method according to claim 1 or 2, characterized in that:
the concentration of the chitosan solution in the step (1) is 0.1-0.5 wt%, the concentration of the SiC powder in the mixed solution in the step (1) is 10-20 g/L, the particle size is 30-80nm, the concentration of the nano silver is 1-2 g/L, and the particle size is 10-20 nm.
4. The method of claim 1, wherein: the shearing dispersion in the step (2) is carried out in a shearing dispersion machine, and the conditions of the shearing dispersion are as follows: the rotating speed of the shearing dispersion machine is 300-500r/min, the rotating speed is adjusted to 1500-2000r/min after the shearing dispersion is carried out for 5-10min, and then the shearing dispersion is carried out for 10-15 min.
5. The method of claim 1, wherein: and (3) the distance between the cathode and the anode in the nano suspension solution is 1-2 cm.
6. The method of claim 1, wherein: the applied voltage range of the direct current in the step (3) is 10-60V, and the current density is 0.01-0.5mA/cm2。
7. The method of claim 1, wherein: and (4) the deposition time in the step (3) is 1-5 min.
8. The method of claim 1, wherein: the cathode material in the step (3) is titanium alloy, pure titanium or stainless steel; the anode material is graphite or platinum sheet.
9. A SiC nano silver composite electrodeposition coating prepared by the method of any one of claims 1 to 8.
10. Use of the SiC nanosilver composite electrodeposition coating according to claim 9 in friction-resistant corrosion protection parts.
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Cited By (1)
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| CN114959811A (en) * | 2022-05-31 | 2022-08-30 | 暨南大学 | High-corrosion-resistance composite electroplating electrolyte and preparation method of coating thereof |
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| CN114959811A (en) * | 2022-05-31 | 2022-08-30 | 暨南大学 | High-corrosion-resistance composite electroplating electrolyte and preparation method of coating thereof |
| CN114959811B (en) * | 2022-05-31 | 2023-08-15 | 暨南大学 | High corrosion-resistant composite electroplating electrolyte and preparation method of plating layer thereof |
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Effective date of registration: 20211126 Address after: 241200 Chungu 3D Printing Industrial Park, Hengshan Avenue, Fanchang Economic Development Zone, Fanchang County, Wuhu City, Anhui Province Patentee after: Anhui shengsai Remanufacturing Technology Co.,Ltd. Address before: 510632 No. 601, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Patentee before: Jinan University |
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