CN111962052B - Composite plating process for nickel-based alloy - Google Patents
Composite plating process for nickel-based alloy Download PDFInfo
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- CN111962052B CN111962052B CN202010789652.3A CN202010789652A CN111962052B CN 111962052 B CN111962052 B CN 111962052B CN 202010789652 A CN202010789652 A CN 202010789652A CN 111962052 B CN111962052 B CN 111962052B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
- C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
- C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
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- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
- C23C18/1824—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment
- C23C18/1837—Multistep pretreatment
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Abstract
The invention relates to the technical field of chemical plating, and particularly discloses a nickel-based alloy composite plating process, which comprises the following steps: s1 oil removal: removing oil stains on the surface of the valve ball body; s2 acid washing: removing oxide skin on the surface of the valve ball body; s3 activation: soaking the valve ball in 8-10wt% sulfuric acid solution at 20-30 deg.C for 10-20s, soaking in water at 70-80 deg.C for 15-20min, and taking out; s4 chemical plating: immersing the valve ball into nickel-phosphorus plating solution at 60-70 deg.C and pH of 4.5-4.9 for 30-60min, taking out, washing with water, and drying; the nickel-phosphorus plating solution comprises the following components in percentage by weight: 20-30g/L nickel sulfate, 20-30g/L sodium hypophosphite, 4-6g/L boric acid, 8-15ml/L lactic acid, 6-12g/L succinic acid, 10-15g/L nano diamond powder, 0.4-0.8g/L potassium fluoride, 10-20mg/L sodium dodecyl sulfate, 1.2-1.5g/L stabilizer and 0.1-0.2g/L rare earth salt. The plating layer prepared by the composite plating process has high hardness and excellent wear resistance and corrosion resistance, and can meet the use requirement of a valve ball.
Description
Technical Field
The invention relates to the field of chemical plating technology, in particular to a nickel-based alloy composite plating process.
Background
The ball valve is widely applied to petrochemical industry, natural gas and urban heating systems, and forms a corrosion source (H) under the combined action of chemistry and electrochemistry on the ball valve due to the particularity of geological conditions 2 S、CO、CO 2 、NO 2 、NH 4 Etc.).
In order to improve the corrosion resistance of the sphere, the surface of the sphere needs to be plated with nickel. The chemical nickel-phosphorus plating alloy is used as a common plating process, is suitable for iron parts, steel parts and the like, and has no toxicity, environmental protection and good plating corrosion resistance. Because of the special crystalline structure of the chemical nickel-phosphorus plating alloy, the plated nickel-phosphorus alloy is in an amorphous structure, the crystal lattice gap of the plated layer is compact, and the chemical nickel-phosphorus plating alloy has good protection effect on a substrate and high medium corrosion resistance.
However, the existence of silica particles in the medium causes physical damage to the coating on the surface of the valve ball, which affects the corrosion resistance of the coating, and further reduces the service life of the valve ball. The hardness of the crystal phase structure of the coating is only 550HV, and the requirement of the coating on the physical wear performance cannot be well met.
Therefore, the most conventional method is to heat treat the plated spheres, and the plated layer is converted from an amorphous structure to a crystalline structure by high-temperature treatment, so as to improve the microhardness of the plated layer. However, the heat treatment will cause the corrosion resistance of the plating layer to decrease, and thus needs to be improved.
Disclosure of Invention
Aiming at the problem that the corrosion resistance and the hardness of a plating layer in the prior art cannot meet the requirements at the same time, the invention aims to provide a nickel-based alloy composite plating process which has the advantages of excellent corrosion resistance and high hardness of the plating layer.
In order to achieve the purpose, the invention provides the following technical scheme:
a composite plating process of a nickel-based alloy comprises the following steps:
s1 oil removal: removing oil stains on the surface of the valve ball body;
s2 acid washing: removing oxide skin on the surface of the valve ball body;
s3 activation: soaking the valve ball in 8-10wt% sulfuric acid solution at 20-30 deg.C for 10-20s, soaking in water at 70-80 deg.C for 15-20min, and taking out;
s4 chemical plating: immersing the valve ball body in nickel-phosphorus plating solution at the temperature of 60-70 ℃ and the pH value of 4.5-4.9 for 30-60min, taking out, washing with water and drying;
the nickel-phosphorus plating solution comprises the following components in percentage by weight: 20-30g/L nickel sulfate, 20-30g/L sodium hypophosphite, 4-6g/L boric acid, 8-15ml/L lactic acid, 6-12g/L succinic acid, 10-15g/L nano diamond powder, 0.4-0.8g/L potassium fluoride, 10-20mg/L sodium dodecyl sulfate, 1.2-1.5g/L stabilizer and 0.1-0.2g/L rare earth salt.
By adopting the technical scheme, the valve ball is subjected to S1 oil removal, S2 acid washing and S3 activation in sequence, the surface of the matrix is clean and has catalytic activity; and (4) chemically plating the surface of the valve ball by S4 to form a nickel-phosphorus plating layer.
The formula of the nickel-phosphorus plating solution is optimized and improved, the plating temperature is reduced, and the energy is saved. At present, the plating temperature is about 90 ℃, and the plating speed is reduced after the plating temperature is reduced, thereby affecting the quality of a plating layer. The nickel-phosphorus plating solution of the invention adopts a compound accelerator, thus improving the plating speed and ensuring the quality of the plating layer.
Adding nano diamond powder into the nickel plating solution to deposit the nano diamond powder, nickel and phosphorus on the substrate. The diamond has the advantages of high hardness, wear resistance, stable chemical property and the like, and is beneficial to improving the hardness and the wear resistance of a plating layer. Therefore, the valve ball body can meet the requirements of the coating on the abrasion physical property and the corrosion resistance without heat treatment.
Further, the nano diamond powder is modified, and the modification process is as follows:
firstly, mixing 10-15 parts by weight of diethyl malonate, 7-10 parts by weight of allyl chloride, 12-15 parts by weight of potassium carbonate and 100 parts by weight of acetonitrile uniformly, heating to 75-80 ℃, refluxing and stirring for 12-20h, cooling to room temperature, adding water to remove redundant potassium carbonate, extracting with ethyl acetate, washing an organic phase for 2-3 times, drying with anhydrous sodium sulfate, and removing a solvent by vacuum evaporation to obtain a pre-product;
secondly, mixing 6-8 parts of the pre-product and 0.05-0.08 part of platinum catalyst, stirring and heating to 80-85 ℃, adding 3-4 parts of aminopropyltrimethoxysilane, reacting for 1-2 hours, then adding 0.4-0.6 part of phytic acid, continuing heating to 90-95 ℃, reacting for 2-3 hours, and then adding 20-30 parts of water to obtain a modified solution;
thirdly, 2-3 parts of nano-diamond powder are immersed into 8-12 parts of the modification solution, the temperature is raised to 60-70 ℃, the mixture is continuously stirred for 6-8 hours, and finally, the modified nano-diamond powder is obtained through filtration, washing and drying.
By adopting the above technical scheme, since the particle size of diamond is too small, it has a tendency of agglomeration called as large particles, and the addition amount is not high in general. The invention modifies the nano diamond powder, so that the agglomeration phenomenon is reduced, the nano diamond powder can be uniformly distributed in the coating, and the action effect is better. Meanwhile, a large number of chelating groups are formed on the surface of the diamond, and the bonding performance of the diamond and the nickel-phosphorus coating is enhanced, so that the diamond is not easy to fall off, and the wear resistance of the coating is further improved.
Further, the rare earth salt is neodymium sulfate.
Further, the stabilizer is bismuth sulfate.
By adopting the technical scheme, on one hand, the rare earth neodymium can generate a composite action with sodium dodecyl sulfate, so that bubbles are reduced, the quality of a coating is improved, and on the other hand, the rare earth neodymium has a catalytic action, so that the reduction of metal ions is accelerated, and the deposition speed is improved. The single rare earth salt has low catalytic activity and no promotion effect on the plating speed, but easily causes the plating speed to be reduced. The invention adopts the compounding of the bismuth element and the rare earth neodymium to improve the catalytic activity of the rare earth neodymium and effectively improve the plating speed, and the compounding effect cannot be achieved when the rare earth element is replaced by other types.
Further, the specific process of S1 degreasing is as follows: immersing the valve ball in deoiling liquid at 80-90 deg.C for 10-20min, taking out, washing with water, and drying.
Further, the deoiling liquid comprises 25-30g/L of sodium carbonate, 25-35g/L of sodium hydroxide, 6-15g/L of sodium phosphate and 2-5 g/LOP-10.
By adopting the technical scheme, grease or dirt such as lubricant, antirust oil, polishing paste and the like remained on the surface of the valve ball body is removed, so that the surface of the valve ball body reaches a complete wetting state, a uniform water film can be formed, and the phenomenon of bead hanging is avoided.
Further, the specific process of the S2 pickling is as follows: soaking the valve ball in pickling solution at 30-40 deg.C for 15-30min, taking out, washing with water, and drying.
Further, the pickling solution comprises 15-20wt% of nitric acid, 3-5wt% of hydrofluoric acid, 2-4wt% of urea and the balance of water.
By adopting the technical scheme, an oxide film, an oxide skin and a corrosion product on the surface of the valve ball body are removed.
In conclusion, the invention has the following beneficial effects:
1. the formula of the nickel-phosphorus plating solution adopted by the invention is optimally designed, so that the plating temperature is reduced, and the energy is saved;
2. the invention adopts the modified nano diamond powder to be added into the nickel-phosphorus plating solution, so that the hardness and the wear resistance of the plating layer are improved, and the use requirement is met.
Drawings
FIG. 1 is a flow chart of a method provided by the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples, in which: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
The embodiment of the invention adopts the following raw materials:
the nano diamond powder has a particle size of 15nm and is purchased from Reliter science and technology Co., Ltd of Beijing country; platinum catalyst grade 218, purchased from sienna keli new materials gmbh.
Example 1:
a composite plating process of nickel-based alloy is shown in figure 1 and comprises the following steps:
s1 oil removal: immersing the valve ball body into deoiling liquid at the temperature of 80 ℃ for 20min, taking out, washing with water, and air-drying, wherein the deoiling liquid comprises 25g/L sodium carbonate, 25g/L sodium hydroxide, 6g/L sodium phosphate, 2g/LOP-10 and water as a solvent;
s2 acid washing: immersing the valve ball deoiled by S1 in a pickling solution, soaking at 30 ℃ for 30min, taking out, washing with water, and air-drying, wherein the pickling solution comprises 15wt% of nitric acid, 3wt% of hydrofluoric acid, 2wt% of urea and the balance of water;
s3 activation: soaking the valve ball pickled by S2 in 8wt% sulfuric acid solution at 20 ℃ for 20S, placing the valve ball in water at 70 ℃ for 20min, and taking out;
s4 chemical plating: immersing the valve ball activated by S3 into a nickel-phosphorus plating solution, taking out, washing with water, and air-drying, wherein the temperature is 60 ℃, the pH value is 4.5, and the time is 60min, and the nickel-phosphorus plating solution comprises the following components: 20g/L of nickel sulfate, 20g/L of sodium hypophosphite, 4g/L of boric acid, 8ml/L of lactic acid, 6g/L of succinic acid, 10g/L of modified nano diamond powder, 0.4g/L of potassium fluoride, 10mg/L of sodium dodecyl sulfate, 1.2g/L of bismuth sulfate and 0.1g/L of neodymium sulfate.
The preparation process of the modified nano diamond powder comprises the following steps:
firstly, mixing 10 parts by weight of diethyl malonate, 7 parts by weight of allyl chloride, 12 parts by weight of potassium carbonate and 100 parts by weight of acetonitrile uniformly, heating to 75 ℃, refluxing and stirring for 20 hours, cooling to room temperature, adding water to remove redundant potassium carbonate, extracting with ethyl acetate, washing an organic phase with water for 2 times, drying with anhydrous sodium sulfate, and evaporating in vacuum to remove a solvent to obtain a pre-product;
secondly, mixing 6 parts of the pre-product and 0.05 part of platinum catalyst, stirring and heating to 80 ℃, adding 3 parts of aminopropyl trimethoxy silane, reacting for 2 hours, adding 0.4 part of phytic acid, continuing heating to 90 ℃, reacting for 3 hours, and then adding 20 parts of water to obtain a modified solution;
and thirdly, immersing 2 parts of nano-diamond powder into 8 parts of the modification solution, heating to 60 ℃, continuously stirring for 8 hours, and finally filtering, washing and drying to obtain the modified nano-diamond powder.
Example 2:
a composite plating process of nickel-based alloy is shown in figure 1 and comprises the following steps:
s1 oil removal: immersing the valve ball body into deoiling liquid at 90 ℃ for 10min, taking out, washing with water, and air-drying, wherein the deoiling liquid comprises 30g/L sodium carbonate, 35g/L sodium hydroxide, 15g/L sodium phosphate, 5g/LOP-10 and water as a solvent;
s2 acid washing: immersing the valve ball deoiled by S1 in a pickling solution, soaking at 40 ℃ for 15min, taking out, washing with water, and air-drying, wherein the pickling solution comprises 20wt% of nitric acid, 5wt% of hydrofluoric acid, 4wt% of urea and the balance of water;
s3 activation: soaking the valve ball pickled by S2 in 10wt% sulfuric acid solution at 30 ℃ for 10S, placing the valve ball in water at 80 ℃ for 15min, and taking out;
s4 chemical plating: immersing the valve ball activated by S3 into nickel-phosphorus plating solution, taking out, washing with water, and air-drying, wherein the temperature is 70 ℃, the pH value is 4.9, and the time is 30min, and the nickel-phosphorus plating solution comprises the following components: 30g/L of nickel sulfate, 30g/L of sodium hypophosphite, 6g/L of boric acid, 15ml/L of lactic acid, 12g/L of succinic acid, 15g/L of modified nano diamond powder, 0.8g/L of potassium fluoride, 20mg/L of sodium dodecyl sulfate, 1.5g/L of bismuth sulfate and 0.2g/L of neodymium sulfate.
The preparation process of the modified nano diamond powder comprises the following steps:
firstly, mixing 15 parts of diethyl malonate, 10 parts of allyl chloride, 15 parts of potassium carbonate and 120 parts of acetonitrile uniformly by weight, heating to 80 ℃, refluxing and stirring for 12 hours, cooling to room temperature, adding water to remove redundant potassium carbonate, extracting with ethyl acetate, washing an organic phase for 3 times, drying with anhydrous sodium sulfate, and evaporating in vacuum to remove a solvent to obtain a pre-product;
step two, mixing 8 parts of the pre-product and 0.08 part of platinum catalyst, stirring and heating to 85 ℃, adding 4 parts of aminopropyl trimethoxy silane, reacting for 1 hour, adding 0.6 part of phytic acid, continuing heating to 95 ℃, reacting for 2 hours, and then adding 30 parts of water to obtain a modified solution;
and thirdly, immersing 3 parts of nano-diamond powder into 12 parts of the modification solution, heating to 70 ℃, continuously stirring for 6 hours, and finally filtering, washing and drying to obtain the modified nano-diamond powder.
Example 3:
a composite plating process of nickel-based alloy is shown in figure 1 and comprises the following steps:
s1 deoiling: immersing the valve ball body into deoiling liquid at the temperature of 85 ℃ for 15min, taking out, washing with water, and air-drying, wherein the deoiling liquid comprises 28g/L sodium carbonate, 30g/L sodium hydroxide, 12g/L sodium phosphate, 3g/LOP-10 and water as a solvent;
s2 acid washing: immersing the valve ball deoiled by S1 in a pickling solution, soaking at 35 ℃ for 18min, taking out, washing with water, and air-drying, wherein the pickling solution comprises 18wt% of nitric acid, 4wt% of hydrofluoric acid, 3wt% of urea and the balance of water;
s3 activation: soaking the valve ball pickled by S2 in 9wt% sulfuric acid solution at 25 ℃ for 15S, placing the valve ball in water at 75 ℃ for 18min, and taking out;
s4 chemical plating: immersing the valve ball activated by S3 into a nickel-phosphorus plating solution, wherein the temperature is 65 ℃, the pH value is 4.7, the time is 45min, taking out, washing with water, and air-drying, and the nickel-phosphorus plating solution comprises the following components: 25g/L of nickel sulfate, 25g/L of sodium hypophosphite, 5g/L of boric acid, 12ml/L of lactic acid, 8g/L of succinic acid, 12g/L of modified nano diamond powder, 0.6g/L of potassium fluoride, 15mg/L of sodium dodecyl sulfate, 1.3g/L of bismuth sulfate and 0.15g/L of neodymium sulfate.
The preparation process of the modified nano diamond powder comprises the following steps:
firstly, mixing 12 parts by weight of diethyl malonate, 8 parts by weight of allyl chloride, 14 parts by weight of potassium carbonate and 110 parts by weight of acetonitrile uniformly, heating to 78 ℃, refluxing and stirring for 16 hours, cooling to room temperature, adding water to remove excess potassium carbonate, extracting with ethyl acetate, washing an organic phase with water for 2 times, drying with anhydrous sodium sulfate, and removing a solvent by vacuum evaporation to obtain a pre-product;
secondly, mixing 7 parts of the pre-product and 0.07 part of platinum catalyst, stirring and heating to 82 ℃, adding 3.5 parts of aminopropyl trimethoxy silane, reacting for 1.5h, then adding 0.5 part of phytic acid, continuously heating to 92 ℃, reacting for 2.5h, and then adding 25 parts of water to obtain a modified solution;
thirdly, 2.5 parts of nano-diamond powder is immersed into 10 parts of the modification solution, the temperature is raised to 65 ℃, the mixture is continuously stirred for 7 hours, and finally, the modified nano-diamond powder is obtained through filtration, washing and drying.
Example 4:
the difference from example 3 is that the nanodiamond powder was not modified.
Example 5:
the difference from example 3 is that the rare earth salt is cerium sulfate.
Example 6:
the difference from example 3 is that the stabilizer is sodium thiosulfate.
Comparative example 1:
the difference from example 3 is that the nickel phosphorous plating solution does not include modified nano-diamond powder.
Comparative example 2:
the difference from the example 3 is that the specific process of the S4 electroless plating is as follows: and (3) immersing the valve ball activated by S3 into a nickel-phosphorus plating solution, wherein the pH value is 3.8, the temperature is 90 ℃, the time is 45min, taking out the valve ball, washing with water, and air-drying, wherein the nickel-phosphorus plating solution comprises 30g/L nickel sulfate, 30g/L sodium hypophosphite, 8g/L sodium citrate, 15g/L sodium acetate and 4g/L succinic acid.
Comparative example 3:
the difference from the comparative example 2 is that the heat treatment of S5 is also included, and the specific process of the heat treatment of S5 is as follows: and (3) placing the valve ball in a box type electric heating furnace, heating to 300 ℃, treating for 2h, and cooling to room temperature.
Comparative example 4:
the difference from example 3 is that the nickel phosphorous plating solution does not include neodymium sulfate.
Comparative example 5:
the difference from example 3 is that the nickel phosphorous plating solution does not include bismuth sulfate.
The plating layers of examples 1 to 6 and comparative examples 1 to 5 were subjected to hardness test, corrosion resistance test and wear resistance test. The corrosion resistance test refers to a copper accelerated acetate salt spray test recorded in GB/T10125-. The abrasion resistance test is carried out according to a Taber abrasion test method, a CS-10 abrasion machine is adopted, 1000 g/wheel is loaded, the time is 10000 r, and the abrasion loss is recorded. The results of the above tests are shown in Table 1.
TABLE 1 coating performance test results recording table
| Hardness (HV) | Corrosion resistance (h) | Abrasion resistance (mg) | |
| Example 1 | 1000 | 168 | 8.6 |
| Example 2 | 1000 | 168 | 8.8 |
| Example 3 | 1000 | 168 | 8.3 |
| Example 4 | 900 | 168 | 116.1 |
| Example 5 | 900 | 144 | 9.1 |
| Example 6 | 900 | 144 | 9.2 |
| Comparative example 1 | 550 | 144 | 146.8 |
| Comparative example 2 | 550 | 96 | 158.3 |
| Comparative example 3 | 900 | 72 | 88.9 |
| Comparative example 4 | 900 | 144 | 15.8 |
| Comparative example 5 | 900 | 144 | 9.3 |
As can be seen from table 1:
the wear resistance and hardness results of the embodiments 3 and 4 and the comparative example 1 are compared, and the nano diamond powder can be uniformly distributed in the plating layer after being modified, so that the wear resistance and hardness of the plating layer are greatly improved;
the comprehensive properties of the embodiments 3, 5 and 6 and the comparative examples 4 and 5 can be obtained by comparison, and the plating speed can be improved after the neodymium sulfate and the bismuth sulfate are compounded, so that the quality of a plating layer is improved, and the comprehensive properties are improved;
the comprehensive performance of the embodiment 3 and the comparative examples 2 and 3 can be compared, and the composite plating process is superior to the common process, has better comprehensive performance of a plating layer, does not need heat treatment, and saves energy.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. The composite plating process of the nickel-based alloy is characterized by comprising the following steps of:
s1 deoiling: removing oil stains on the surface of the valve ball body;
s2 acid washing: removing oxide skin on the surface of the valve ball body;
s3 activation: soaking the valve ball in 8-10wt% sulfuric acid solution at 20-30 deg.C for 10-20s, soaking in water at 70-80 deg.C for 15-20min, and taking out;
s4 chemical plating: immersing the valve ball body in nickel-phosphorus plating solution at the temperature of 60-70 ℃ and the pH value of 4.5-4.9 for 30-60min, taking out, washing with water and drying;
the nickel-phosphorus plating solution comprises the following components in percentage by weight: 20-30g/L nickel sulfate, 20-30g/L sodium hypophosphite, 4-6g/L boric acid, 8-15ml/L lactic acid, 6-12g/L succinic acid, 10-15g/L nano diamond powder, 0.4-0.8g/L potassium fluoride, 10-20mg/L sodium dodecyl sulfate, 1.2-1.5g/L bismuth sulfate and 0.1-0.2g/L neodymium sulfate;
the nano diamond powder is modified, and the modification process is as follows:
firstly, mixing 10-15 parts by weight of diethyl malonate, 7-10 parts by weight of allyl chloride, 12-15 parts by weight of potassium carbonate and 120 parts by weight of acetonitrile, heating to 75-80 ℃, refluxing and stirring for 12-20h, cooling to room temperature, adding water to remove redundant potassium carbonate, extracting with ethyl acetate, washing an organic phase for 2-3 times, drying with anhydrous sodium sulfate, and removing a solvent by vacuum evaporation to obtain a pre-product;
secondly, mixing 6-8 parts of the pre-product and 0.05-0.08 part of platinum catalyst, stirring and heating to 80-85 ℃, adding 3-4 parts of aminopropyltrimethoxysilane, reacting for 1-2 hours, then adding 0.4-0.6 part of phytic acid, continuing heating to 90-95 ℃, reacting for 2-3 hours, and then adding 20-30 parts of water to obtain a modified solution;
thirdly, 2-3 parts of nano-diamond powder are immersed into 8-12 parts of the modification solution, the temperature is raised to 60-70 ℃, the mixture is continuously stirred for 6-8 hours, and finally, the modified nano-diamond powder is obtained through filtration, washing and drying.
2. The composite plating process of the nickel-based alloy as claimed in claim 1, wherein: the specific process of S1 deoiling is as follows: immersing the valve ball in deoiling liquid at 80-90 deg.C for 10-20min, taking out, washing with water, and drying.
3. The composite plating process of the nickel-based alloy as claimed in claim 2, wherein: the deoiling liquid comprises 25-30g/L of sodium carbonate, 25-35g/L of sodium hydroxide, 6-15g/L of sodium phosphate and 2-5 g/LOP-10.
4. The composite plating process of the nickel-based alloy as claimed in claim 1, characterized in that: the specific process of S2 acid washing is as follows: soaking the valve ball in pickling solution at 30-40 deg.C for 15-30min, taking out, washing with water, and drying.
5. The composite plating process of the nickel-based alloy as claimed in claim 4, wherein: the pickling solution comprises 15-20wt% of nitric acid, 3-5wt% of hydrofluoric acid, 2-4wt% of urea and the balance of water.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439451A (en) * | 2002-11-18 | 2003-09-03 | 长沙矿冶研究院 | Nano-diamond deagglomeration and grading method |
| CN102491991A (en) * | 2011-11-14 | 2012-06-13 | 西北师范大学 | Organic silicon coupling agent containing beta-dicarbonyl and preparation method thereof |
| CN108559979A (en) * | 2018-01-24 | 2018-09-21 | 永星化工(上海)有限公司 | A kind of chemical nickel-plating liquid and preparation method thereof |
| JP2019090063A (en) * | 2017-11-10 | 2019-06-13 | ユニチカ株式会社 | Plating solution for composite plating, composite plated article, and aqueous dispersion of polyolefin resin for composite plating |
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| CN103966579B (en) * | 2014-05-15 | 2017-02-22 | 韶关学院 | Process for preparing nano diamond composite nickel-phosphorus coating on surface of metal |
| CN104561951A (en) * | 2014-07-04 | 2015-04-29 | 广东丹邦科技有限公司 | Method and plating solution for chemical plating of nickel phosphorus alloy, and nickel phosphorus alloy layer |
| US10006126B2 (en) * | 2014-10-27 | 2018-06-26 | Surface Technology, Inc. | Plating bath solutions |
| CN104561961A (en) * | 2014-12-27 | 2015-04-29 | 广东致卓精密金属科技有限公司 | Chemical cobalt-nickel plating alloy liquid and process |
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| CN1439451A (en) * | 2002-11-18 | 2003-09-03 | 长沙矿冶研究院 | Nano-diamond deagglomeration and grading method |
| CN102491991A (en) * | 2011-11-14 | 2012-06-13 | 西北师范大学 | Organic silicon coupling agent containing beta-dicarbonyl and preparation method thereof |
| JP2019090063A (en) * | 2017-11-10 | 2019-06-13 | ユニチカ株式会社 | Plating solution for composite plating, composite plated article, and aqueous dispersion of polyolefin resin for composite plating |
| CN108559979A (en) * | 2018-01-24 | 2018-09-21 | 永星化工(上海)有限公司 | A kind of chemical nickel-plating liquid and preparation method thereof |
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