CN117488378A - Nickel-silver alloy with high hydrophilicity and preparation method and application thereof - Google Patents
Nickel-silver alloy with high hydrophilicity and preparation method and application thereof Download PDFInfo
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- CN117488378A CN117488378A CN202311194272.5A CN202311194272A CN117488378A CN 117488378 A CN117488378 A CN 117488378A CN 202311194272 A CN202311194272 A CN 202311194272A CN 117488378 A CN117488378 A CN 117488378A
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- 229910001316 Ag alloy Inorganic materials 0.000 title claims abstract description 57
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000010956 nickel silver Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 118
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 59
- 239000011159 matrix material Substances 0.000 claims abstract description 48
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052709 silver Inorganic materials 0.000 claims abstract description 38
- 239000004332 silver Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000000956 alloy Substances 0.000 claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000007747 plating Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 45
- 239000008139 complexing agent Substances 0.000 claims description 32
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 30
- 238000009713 electroplating Methods 0.000 claims description 26
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 26
- 229960002317 succinimide Drugs 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 14
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 4
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 3
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- 238000007772 electroless plating Methods 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 239000003929 acidic solution Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000003995 emulsifying agent Substances 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 claims description 2
- 229910000367 silver sulfate Inorganic materials 0.000 claims description 2
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 2
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 2
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 20
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- 239000002352 surface water Substances 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910000085 borane Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005660 hydrophilic surface Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 229940095064 tartrate Drugs 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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/46—Electroplating: Baths therefor from solutions of silver
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/38—Pretreatment of metallic surfaces to be electroplated of refractory metals or nickel
- C25D5/40—Nickel; Chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention provides a nickel-silver alloy with high hydrophilicity, a preparation method and application thereof, wherein nickel metal is used as a matrix, metallic silver is deposited on the surface of the matrix as a plating layer, the water contact angle of the surface of the alloy is less than 90 degrees, the defect that the nickel-silver alloy obtained by the traditional preparation method cannot obtain better hydrophilicity is overcome, the nickel-silver alloy is limited in use in a plurality of fields, the prepared nickel-silver alloy has high hydrophilicity by utilizing a silver plating heat treatment process on the surface of the nickel matrix, even super hydrophilicity can be realized by regulating and controlling the treatment process, and the nickel-silver alloy can play a larger role in the fields of surface heat transfer and the like, and has important significance.
Description
Technical Field
The invention belongs to the technical field of hydrophilic alloy preparation, and particularly relates to a nickel-silver alloy with high hydrophilicity, and a preparation method and application thereof.
Background
The nickel-silver alloy is a high-quality alloy material, consists of two elements of silver and nickel, and has excellent corrosion resistance, heat resistance and good conductivity. It is widely applied to the industries of electronics, metallurgy, chemical industry and the like, and is an important material for a plurality of high-end products. The nickel-silver alloy also has excellent weldability and processability and can adapt to different process requirements.
The hydrophilic alloy surface exhibits many excellent properties, particularly improved surface heat exchange efficiency. In recent years, a great deal of research has also shown that hydrophilic surfaces have a great promoting effect on heat transfer, and have been widely used in various heat transfer fields.
For nickel silver alloy, the hydrophilic surface can reduce the formation of bubbles and water films on the surface of the material, and in the heat transfer process, the bubbles and the water films can influence the heat transfer, so that the heat transfer efficiency is reduced.
At present, no literature report and patent technology aiming at improving the hydrophilicity of the nickel-silver alloy surface exist. Therefore, there is a need to develop a method that can easily and simply increase the hydrophilicity of the nickel-silver alloy surface.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
Therefore, the invention aims to overcome the defects in the prior art and provide a nickel-silver alloy with high hydrophilicity, wherein nickel metal is used as a matrix, metallic silver is deposited on the surface of the matrix as a plating layer, and the water contact angle of the surface of the alloy is less than 90 degrees.
It is still another object of the present invention to provide a method for preparing a nickel-silver alloy with high hydrophilicity.
In order to solve the technical problems, the invention provides the following technical scheme: comprising the steps of (a) a step of,
removing greasy dirt and an oxidation layer on the surface of the nickel matrix, and cleaning and drying to obtain a pretreated nickel matrix;
and depositing metallic silver on the surface of the pretreated nickel matrix by an electroplating method, and performing heat treatment to obtain the nickel-silver alloy with high hydrophilicity.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the method for removing the greasy dirt on the surface of the nickel matrix comprises the steps of removing the greasy dirt on the surface of the nickel matrix through alkali liquor, an emulsifying agent or an organic solvent, and removing the oxide layer of the nickel matrix through an acidic solution.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the electroplating method uses silver salt as a silver source, succinimide as a main complexing agent, citric acid, ethylenediamine tetraacetic acid and sodium pyrophosphate as auxiliary complexing agents, and performs electroplating within the voltage range of-0.1 to-1V.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the silver source comprises one of silver sulfate, silver nitrate or silver chloride.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the concentration of the silver source is 0.001-1 mol/L, the concentration of the main complexing agent is 0.001-1 mol/L, and the concentration of the auxiliary complexing agent is 0.001-1 mol/L.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the electroplating temperature is 20-50 ℃, the electroplating time is 5-30 min, and the pH is 7-10.
The invention can also deposit metallic silver on the nickel-based metal surface by electroless plating, including,
silver salt is used as a silver source, succinimide is used as a main complexing agent, tartrate, ethylenediamine tetraacetic acid and citric acid are used as auxiliary complexing agents, hypophosphite, sodium borohydride and borane are used as reducing agents, and chemical plating is carried out after reaction for 5-30 min.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: in the chemical plating process, the concentration of silver salt is 0.001-1 mol/L, the concentration of main complexing agent is 0.001-1 mol/L, the concentration of auxiliary complexing agent is 0.001-1 mol/L, and the concentration of reducing agent is 0.001-1 mol/L.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the heat treatment is performed under a reducing atmosphere or an inert atmosphere.
As a preferable scheme of the preparation method of the nickel-silver alloy with high hydrophilicity, the preparation method comprises the following steps: the temperature of the overheat treatment is 200-1100 ℃, and the time of the overheat treatment is 30-480 min.
It is a further object of the present invention to provide a use of a nickel silver alloy of high hydrophilicity as a heat transfer material.
The invention has the beneficial effects that:
the nickel-silver alloy obtained by the traditional preparation method cannot obtain better hydrophilicity, so that the nickel-silver alloy is limited in use in a plurality of fields. The invention uses the heat treatment technology after silver plating on the surface of the nickel matrix, so that the prepared nickel-silver alloy has high hydrophilicity, and can play a larger role in the fields of surface heat transfer and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 shows the results of the water contact angle test of the alloy surface prepared in example 1 of the present invention.
FIG. 2 shows the water contact angle test results of the alloy surface prepared in example 2 of the present invention.
FIG. 3 shows the water contact angle test results of the alloy surface prepared in example 3 of the present invention.
FIG. 4 shows the water contact angle test results of the alloy surface prepared in example 4 of the present invention.
FIG. 5 shows the water contact angle test results of the alloy surface prepared in example 5 of the present invention.
FIG. 6 shows the results of the water contact angle test of the alloy surface prepared in comparative example 1 of the present invention.
FIG. 7 shows the results of the water contact angle test of the alloy surface prepared in comparative example 2 of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) Performing heat treatment under reducing atmosphere of 5% hydrogen and 95% argon at 200deg.C for 30min to obtain nickel-silver alloy named Ni-Ag@1,
the test result of the water contact angle of the surface of the alloy prepared in the embodiment is shown in fig. 1, and the result shows that the water contact angle of the surface of the alloy is 0 degrees, which indicates that the prepared nickel-silver alloy has super-hydrophilicity.
Example 2
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate is used as a silver source, succinimide is used as a main complexing agent, citric acid is used as an auxiliary complexing agent, wherein the concentration of the silver nitrate is 0.01mol/L, the concentration of the succinimide is 0.01mol/L, the concentration of the citric acid is 0.01mol/L, the surface of a nickel matrix is electroplated for 5min under the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that a nickel matrix with a silver layer plated on the surface is obtained;
3) The heat treatment is carried out under a reducing atmosphere of 5% hydrogen and 95% argon, the treatment temperature is 400 ℃, the treatment time is 30min, and the obtained sample is named as Ni-Ag@2.
The test result of the water contact angle of the surface of the alloy prepared in the embodiment is shown in fig. 2, and the result shows that the water contact angle of the surface of the alloy is 0 degrees, which indicates that the prepared nickel-silver alloy has super-hydrophilicity.
Example 3
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate is used as a silver source, succinimide is used as a main complexing agent, citric acid is used as an auxiliary complexing agent, wherein the concentration of the silver nitrate is 0.01mol/L, the concentration of the succinimide is 0.01mol/L, the concentration of the citric acid is 0.01mol/L, the surface of a nickel matrix is electroplated for 5min under the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that a nickel matrix with a silver layer plated on the surface is obtained;
3) The heat treatment is carried out under a reducing atmosphere of 5% hydrogen and 95% argon, the treatment temperature is 200 ℃, the treatment time is 60min, and the obtained sample is named as Ni-Ag@3.
The test result of the water contact angle of the surface of the alloy prepared in the embodiment is shown in fig. 3, and the result shows that the water contact angle of the surface of the alloy is 0 degrees, which indicates that the prepared nickel-silver alloy has super-hydrophilicity.
Example 4
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) The nickel-silver alloy of this example was obtained by performing heat treatment in a reducing atmosphere of 5% hydrogen and 95% argon at a treatment temperature of 200 ℃ for 15 minutes.
The surface contact angle was measured, and the result is shown in fig. 4, and the result shows that the surface water contact angle is 72.3 degrees, and the surface water contact angle has high hydrophilicity.
Example 5
In this embodiment, metal silver is deposited on the surface of the substrate by an electroless plating method, specifically:
1) The nickel sheet is used as a matrix, the nickel sheet is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxide;
2) Taking silver chloride with the concentration of 0.1mol/L as a silver source, taking succinimide with the concentration of 0.1mol/L as a main complexing agent, taking citric acid with the concentration of 0.1mol/L as an auxiliary complexing agent, and taking borane with the concentration of 0.1mol/L as a reducing agent to carry out chemical plating to obtain a nickel substrate with a silver layer plated on the surface;
3) And performing heat treatment under a reducing atmosphere of 5% hydrogen and 95% argon at a treatment temperature of 200 ℃ for 30min to obtain the alloy of the embodiment.
The surface contact angle was measured, and the result is shown in fig. 5, and the result shows that the surface water contact angle is 68.3 degrees, and the surface water contact angle has high hydrophilicity.
Comparative example 1
This comparative example differs from example 1 in that the plating voltage in step 2) was adjusted to-1.2V, specifically:
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-1.2V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) And (3) performing heat treatment under a reducing atmosphere of 5% hydrogen and 95% argon at a treatment temperature of 200 ℃ for 30min to obtain the nickel-silver alloy of the comparative example.
The surface water contact angle test result of the alloy prepared in the comparative example is shown in fig. 6, and the result shows that the surface water contact angle is 109 degrees, which indicates that the prepared nickel-silver alloy is hydrophobic.
Comparative example 2
This comparative example differs from example 1 in that the heat treatment temperature in step 3) was adjusted to 100 ℃, specifically:
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) And (3) performing heat treatment under a reducing atmosphere of 5% hydrogen and 95% argon at a treatment temperature of 100 ℃ for 30min to obtain the nickel-silver alloy of the comparative example.
The surface water contact angle test result of the alloy prepared in the comparative example is shown in fig. 7, and the result shows that the surface water contact angle is 103 degrees, which indicates that the prepared nickel-silver alloy is hydrophobic.
Example 7
The difference between this example and example 1 is that the voltage of the plating in step 2) was adjusted to-0.6V, -0.8V, -1V, specifically:
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min under the voltage of-0.6V, -0.8V and-1V respectively, the electroplating temperature is 25 ℃, and the pH=9, so that a nickel matrix with a silver layer plated on the surface is obtained;
3) The nickel-silver alloy of this example was obtained by performing heat treatment in a reducing atmosphere of 5% hydrogen and 95% argon at a treatment temperature of 200 ℃ for 30 minutes.
The nickel-silver alloy of this example was tested for hydrophilicity, and the results showed that the surface water contact angle was between 10 ° and 90 °, exhibiting high hydrophilicity.
Example 8
This example differs from example 1 in that the temperature of the heat treatment in step 3) is adjusted to 600 ℃, 800 ℃, 1000 ℃, respectively, specifically:
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) The nickel-silver alloy of this example was obtained by performing heat treatment in a reducing atmosphere of 5% hydrogen and 95% argon at 600 ℃, 800 ℃, 1000 ℃ and 30 minutes.
The nickel-silver alloy of this example was tested for hydrophilicity, and the results showed that the surface water contact angle was between 10 ° and 90 °, exhibiting high hydrophilicity.
Example 9
The difference between this example and example 1 is that the time of the heat treatment in step 3) is adjusted to 120min, 240min, 480min, specifically:
1) The nickel screen is used as a matrix, the nickel screen is pretreated, ethanol and acetone are used for removing greasy dirt on the surface, and sulfuric acid is used for removing surface oxides;
2) Silver nitrate with the concentration of 0.01mol/L is used as a silver source, succinimide with the concentration of 0.01mol/L is used as a main complexing agent, citric acid with the concentration of 0.01mol/L is used as an auxiliary complexing agent, electroplating is carried out on the surface of a nickel matrix for 5min at the voltage of-0.3V, the electroplating temperature is 25 ℃, and the pH value is=9, so that the nickel matrix with the silver layer plated on the surface is obtained;
3) The nickel-silver alloy of this example was obtained by performing heat treatment in a reducing atmosphere of 5% hydrogen and 95% argon at 200 ℃ for 120min, 240min and 480min, respectively.
The nickel-silver alloy of this example was tested for hydrophilicity, and the results showed that the surface water contact angle was between 10 ° and 90 °, exhibiting high hydrophilicity.
In summary, the method overcomes the defect that the nickel-silver alloy obtained by the traditional preparation method cannot obtain better hydrophilicity, so that the nickel-silver alloy is limited in use in a plurality of fields, and the prepared nickel-silver alloy has high hydrophilicity by utilizing the process of silver plating and heat treatment on the surface of a nickel substrate, can even realize super hydrophilicity by regulating and controlling the treatment process, can play a larger role in the fields of surface heat transfer and the like, and has important significance.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. A highly hydrophilic nickel silver alloy, characterized by: the alloy takes nickel metal as a matrix, metallic silver is deposited on the surface of the matrix as a plating layer, and the water contact angle of the surface of the alloy is less than 90 degrees.
2. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 1, wherein the method comprises the following steps: comprising the steps of (a) a step of,
removing greasy dirt and an oxidation layer on the surface of the nickel matrix, and cleaning and drying to obtain a pretreated nickel matrix;
and depositing metallic silver on the surface of the pretreated nickel matrix by an electroplating method or an electroless plating method, and performing heat treatment to obtain the nickel-silver alloy with high hydrophilicity.
3. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 2, wherein the method comprises the following steps: the method for removing the greasy dirt on the surface of the nickel matrix comprises the steps of removing the greasy dirt on the surface of the nickel matrix through alkali liquor, an emulsifying agent or an organic solvent, and removing the oxide layer of the nickel matrix through an acidic solution.
4. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 2, wherein the method comprises the following steps: the electroplating method uses silver salt as a silver source, succinimide as a main complexing agent, citric acid, ethylenediamine tetraacetic acid and sodium pyrophosphate as auxiliary complexing agents, and performs electroplating within the voltage range of-0.1 to-1V.
5. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 4, wherein the method comprises the following steps: the silver source comprises one of silver sulfate, silver nitrate or silver chloride.
6. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 4, wherein the method comprises the following steps: the concentration of the silver source is 0.001-1 mol/L, the concentration of the main complexing agent is 0.001-1 mol/L, and the concentration of the auxiliary complexing agent is 0.001-1 mol/L.
7. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 4, wherein the method comprises the following steps: the electroplating temperature is 20-50 ℃, the electroplating time is 5-30 min, and the pH is 7-10.
8. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 2, wherein the method comprises the following steps: the heat treatment is performed under a reducing atmosphere or an inert atmosphere.
9. The method for preparing the nickel-silver alloy with high hydrophilicity according to claim 2 or 8, wherein: the temperature of the overheat treatment is 200-1100 ℃, and the time of the overheat treatment is 30-480 min.
10. Use of a highly hydrophilic nickel silver alloy according to claim 1 as a heat transfer material.
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