CN111945193A - Ni-P-YSZ/Ni-P double-layer nano composite coating and preparation method thereof - Google Patents
Ni-P-YSZ/Ni-P double-layer nano composite coating and preparation method thereof Download PDFInfo
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- CN111945193A CN111945193A CN202010732979.7A CN202010732979A CN111945193A CN 111945193 A CN111945193 A CN 111945193A CN 202010732979 A CN202010732979 A CN 202010732979A CN 111945193 A CN111945193 A CN 111945193A
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention discloses a Ni-P-YSZ/Ni-P double-layer nano composite plating layer and a plating process thereof, wherein the plating solution (1) comprises the following components: 12-20 g/L of main salt of the plating solution, 28-40 g/L of reducing agent, 27-39 g/L of complexing agent, 10-25 g/L of buffering agent, 8-15 g/L of accelerator, 1-2 mg/L of stabilizer, pH value adjustment of 4.5-5.0 and distilled water as solvent; the plating solution (2) is composed of: 12-22 g/L of plating solution main salt, 15-25 g/L of reducing agent, 20-40 g/L of complexing agent, 10-25 g/L of buffering agent, 1-2 mg/L of stabilizing agent, 1-18 g/L of YSZ (yttrium stabilized zirconia) nano particles, 1.5-3 g/L of surfactant, 7.0-7.5 of pH value and distilled water as solvent. The plating process comprises the following steps: preparing a plating solution (1) and a plating solution (2), performing oil removal, rust removal, cleaning and activation treatment on the surface of a sample, plating the sample in the plating solution (1) and the plating solution (2) respectively, placing the plating solutions in a constant-temperature water bath, and performing total plating time for 2.0-2.5 hours. And (3) carrying out heat preservation treatment on the plated part for 1.0-1.5 hours at 400-450 ℃ in a protective atmosphere, and taking out the plated part after furnace cooling to obtain the double-layer nano composite plating layer which is good in appearance, high in hardness, strong in wear resistance and corrosion resistance and low in surface roughness.
Description
Technical Field
The invention relates to the technical field of chemical composite plating, in particular to a chemical composite plating Ni-P-YSZ/Ni-P plating solution and a preparation process thereof.
Background
The process for preparing the high-performance plating layer by Ni-P alloy chemical plating is a novel surface protection and surface strengthening technical means which is rapidly developed in recent years. The chemical nickel plating layer has excellent comprehensive properties such as excellent corrosion resistance, high hardness, good wear resistance and the like, and is widely applied to the engineering fields such as aerospace, petrochemical industry, machinery, automobiles, energy sources, medical treatment and the like. Electroless plating is a metal deposition process in which metal ions are reduced by a reducing agent in a plating solution under the autocatalytic action of the metal surface. In the plating process, defects such as pinholes and pits can appear, so that the plating layer forms galvanic corrosion in a corrosive medium, the plating layer cannot protect a base body, and the damage of the base body material is accelerated.
With the development of industrial technology, the requirements on wear resistance and corrosion resistance of various parts are higher and higher, and a single chemical plating can not meet the development requirements. In order to improve the mechanical and corrosion resistance of the plating layer, a double-layer Ni-P plating layer is developed on the basis of a single-layer Ni-P plating layer, and the problem of the single-layer Ni-P plating layer is solved to a certain extent. Researches find that the content of phosphorus in the Ni-P plating layer can influence the crystal structure and the performance of the plating layer, and the coating with the phosphorus content of low phosphorus (1-5 wt.%) has high hardness, good wear resistance and poor corrosion resistance; high phosphorous coatings (> 5 wt.%) have good corrosion resistance and mechanical properties. Therefore, the combination property of the double-layer composite coating is obviously improved compared with that of a single coating.
The nano particles have a plurality of well-known unique physical and chemical properties due to the quantum size effect, so that the hardness and the corrosion resistance are improved by adding the solid nano particles into the Ni-P matrix, the potential application of the solid nano particles in the engineering field is widened, and the method is an effective method for improving the protective performance of the coating. Yttrium-fully stabilized zirconia (YSZ) nanoparticles can significantly change the phase transition temperature range of zirconia by adding a certain amount of yttrium to the zirconia, thereby producing cubic and tetragonal crystals that are stable at room temperature. YSZ has chemical inertness, low thermal conductivity, high hardness, fracture toughness, and excellent wear resistance, and is widely used in materials that improve the surface characteristics of metal materials. At present, few reports on the high-grade chemical plating design aspect of YSZ nanoparticle reinforced Ni-P-YSZ/Ni-P double-layer nano composite plating layer materials are reported.
Disclosure of Invention
In order to solve the problems, the invention provides a Ni-P-YSZ/Ni-P nano composite plating layer and a preparation method thereof, the plating layer has uniform appearance, good interface between the outer layer and the inner layer and no micropores; and due to the special double-layer structure and the surface layer nano particles, the wear-resistant and corrosion-resistant composite material has good microhardness and wear resistance and excellent corrosion resistance.
The purpose of the invention is realized by the following technical scheme:
a Ni-P-YSZ/Ni-P double-layer nano composite plating layer is characterized in that a plating solution (1) comprises the following components: 12-20 g/L of main salt of the plating solution, 28-40 g/L of reducing agent, 27-39 g/L of complexing agent, 10-25 g/L of buffering agent, 8-15 g/L of accelerator, 1-2 mg/L of stabilizer, pH value adjustment of 4.5-5.0 and distilled water as solvent; the plating solution (2) is composed of: 12-22 g/L of plating solution main salt, 15-25 g/L of reducing agent, 20-40 g/L of complexing agent, 10-25 g/L of buffering agent, 1-2 mg/L of stabilizing agent, 1-18 g/L of YSZ nano particles, 1.5-3 g/L of surfactant, 7.0-7.5 of pH value and distilled water as solvent.
Further, the main salt of the plating solution (1) is nickel sulfate;
the reducing agent is sodium dihydrogen phosphite;
the complexing agent is a mixture of lactic acid and citric acid;
the buffer is sodium acetate;
the accelerator is succinic acid;
the stabilizer is thiourea;
the main salt of the plating solution (2) is nickel sulfate;
the reducing agent is sodium dihydrogen phosphite;
the complexing agent is sodium citrate;
the buffer is sodium acetate;
the stabilizer is thiourea;
the surfactant is sodium dodecylbenzenesulfonate.
Further, the complexing agent of the plating solution (1) is an acidic plating solution complexing agent, and the components of the acidic plating solution complexing agent are a mixture of 7-15 g/L of lactic acid and 20-24 g/L of citric acid; the plating solution (2) is an alkaline plating solution complexing agent, and the component of the plating solution is 20-40 g/L of sodium citrate.
The plating process of the Ni-P-YSZ/Ni-P nano composite plating layer is characterized by comprising the following steps:
(1) sample surface pretreatment: grinding and polishing the surface, and washing the surface with alcohol and deionized water; cleaning for 5-10 minutes by using alcohol-containing ultrasonic waves, and then washing and drying;
(2) preparing two different types of plating solutions;
(3) sample surface activation treatment: cleaning a sample in an alkaline solution at 50-60 ℃ for 10-20 minutes, and performing cold air drying after cleaning with deionized water; soaking in 10 wt.% hydrochloric acid solution for 1-2 minutes; washing with deionized water and drying;
(4) and (3) plating process: adjusting the pH value of the plating solution (1) to 4.5-5.0, heating to 80 ℃, and putting the treated sample into the plating solution for pre-plating; after the pre-plating is finished, washing the surface with deionized water at 80 ℃, immediately putting the surface into a plating solution (2) added with YSZ nano particles for plating, and adjusting the pH value to 7.0-7.5; the pre-plating time is 1.0-1.5 hours, and the total plating time is 2.0-2.5 hours;
(5) and (3) post-plating treatment: carrying out heat treatment on the plated part for 1.0-1.5 hours in a protective atmosphere, wherein the heat treatment temperature is 400-450 ℃; and cooling the furnace after the heat treatment, and taking out the furnace to obtain the plated part meeting the requirements of the plating layer.
Further, the alkaline solution in the step (3) comprises 30g/L of sodium hydroxide, 20g/L of sodium silicate, 25g/L of sodium carbonate and 20g/L of sodium phosphate; the oil removing temperature is 60-90 ℃ and the time is 30 minutes.
Furthermore, the YSZ nano dispersion liquid is prepared by firstly adding nano YSZ powder into a plating solution (2) dissolved with 1.5-3 g/L of lauryl sodium sulfate, and carrying out high-speed stirring and ultrasonic dispersion.
Further, the high-speed stirring speed is 500-1000 rpm, and the dispersion time is 10-15 minutes; the first ultrasonic dispersion power is 600-1000W, and the ultrasonic dispersion time is 5-10 minutes; the second ultrasonic dispersion power is 1000-1500W, and the ultrasonic dispersion time is 15-20 minutes.
Further, the protective atmosphere in step (5) is nitrogen or argon.
The Ni-P-YSZ/Ni-P double-layer nano composite plating layer has all the advantages of a Ni-P coating, the outer Ni-low P coating has higher hardness and better wear resistance, and the inner Ni-high P coating has good corrosion resistance, shows different corrosion potentials and can be used as a sacrificial anode sometimes. Furthermore, the corrosion process usually goes from the surface to the substrate through pores or small defects in the coating, while the presence of the dual phase structure will prevent some pores from passing vertically through the surface into the substrate, thereby further improving the corrosion resistance of the coating.
The YSZ nano particles are the main source of YSZ elements in the Ni-P-YSZ alloy coating, so that the corrosion potential can be increased towards the positive potential direction, the corrosion current density is reduced, and the formation of a passive film on the surface of the coating is promoted by adding the YSZ nano particles, thereby improving the corrosion resistance of the coating. Due to the high hardness of the YSZ nano particles, the nano particles in the composite coating prevent the movement of dislocation in a matrix and the sliding of grain boundaries, so that the wear resistance and the microhardness of the composite coating are further improved.
The invention has the beneficial effects that: the interface of the double-layer nano composite coating obtained by the invention is well combined, no micropores exist, the surface of the coating is smooth, the crystal grains are fine, and the corrosion resistance and the wear resistance of the coating are improved. The whole coating is divided into two parts, wherein the substrate layer is a Ni-high P layer, and the surface layer is a Ni-low P/YSZ mixed coating.
Drawings
FIG. 1 is a surface topography of the Ni-P-YSZ/Ni-P two-layer nanocomposite coating obtained in example 1;
FIG. 2 is a cross-sectional view of the Ni-P-YSZ/Ni-P two-layer nanocomposite coating obtained in example 1.
Detailed Description
In order to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1
A nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution comprises the following parameters and the contents of all components:
plating solution (1): 12g/L of nickel sulfate, 30g/L of sodium dihydrogen phosphite, 10g/L of lactic acid, 20g/L of citric acid, 1mg/L of thiourea, 15g/L of sodium acetate and 10g/L of succinic acid. The solvent is distilled water, the volume of the solution is the total volume of the mixed solute and the solvent, the pH value is 4.5, and the temperature is 85 ℃.
Plating solution (2): 15g/L of nickel sulfate, 20g/L of sodium dihydrogen phosphite, 15g/L of sodium acetate, 20g/L of sodium citrate dihydrate, 1.5g/L of sodium dodecyl benzene sulfonate, 1g/L of YSZ nano particles and 1mg/L of thiourea. The volume of the solution is the total volume of the mixed solute and solvent, the pH value is 7.0, and the temperature is 80 ℃.
The plating process of the nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution specifically comprises the following steps:
(1) sample surface pretreatment: grinding and polishing the surface of the sample, and washing the sample by using alcohol and deionized water; cleaning with alcohol-containing ultrasonic wave for 5 min, washing, and blow-drying;
(2) preparing two plating solutions with different pH values;
(3) sample surface activation treatment: cleaning a sample in an alkaline solution at 50 ℃ for 15 minutes, and performing cold air drying after cleaning with deionized water; subsequently, soaking in 10 wt.% hydrochloric acid solution for 2 minutes; washing with deionized water and drying;
the alkaline solution in the step (3) comprises 20g/L of sodium hydroxide, 25g/L of sodium silicate, 30g/L of sodium carbonate and 20g/L of sodium phosphate, the oil removal temperature is 50 ℃, and the time is 15 minutes;
(4) and (3) plating process: adjusting the pH value of the plating solution (1) to 4.5, heating to 85 ℃, and putting the treated sample into the plating solution (1) for pre-plating; after the pre-plating is finished, the surface is washed by deionized water at 85 ℃, the solution is immediately put into a plating solution (2) added with YSZ nano particles for plating, the pH value is adjusted to 7.0, the pre-plating time is 1.0 hour, and the total plating time is 2.0 hours;
YSZ nano dispersion liquid is prepared by firstly adding nano YSZ powder into a small amount of plating solution (2) dissolved with 1.5g/L of lauryl sodium sulfate, and carrying out high-speed stirring and ultrasonic dispersion; wherein the high-speed stirring speed is 500rpm, and the dispersion time is 10 minutes; the first ultrasonic dispersion power is 600W, and the ultrasonic dispersion time is 5 minutes; the second ultrasonic dispersion power is 1000W, and the ultrasonic dispersion time is 15 minutes;
(5) and (3) post-plating treatment: the plated article was heat-treated in a protective atmosphere for 1.0 hour at a heat treatment temperature of 400 ℃. And cooling the furnace after heat treatment, and taking out the furnace to obtain the product.
Example 2
A nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution comprises the following parameters and the contents of all components:
plating solution (1): 16g/L of nickel sulfate, 28g/L of sodium dihydrogen phosphite, 15g/L of lactic acid, 30g/L of citric acid, 1.5mg/L of thiourea, 15g/L of sodium acetate and 8g/L of succinic acid. The solvent is distilled water, the volume of the solution is the total volume of the mixed solute and the solvent, the pH value is 4.8, and the temperature is 80 ℃.
Plating solution (2): 15g/L of nickel sulfate, 20g/L of sodium dihydrogen phosphite, 10g/L of sodium acetate, 20g/L of sodium citrate dihydrate, 2.0g/L of dodecylbenzenesulfonic acid, 4g/L of YSZ nanoparticles and 1.2mg/L of thiourea. The volume of the solution is the total volume of the mixed solute and solvent, the pH value is 7.1, and the temperature is 80 ℃.
The plating process of the nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution specifically comprises the following steps:
(1) sample surface pretreatment: grinding and polishing the surface of the sample, and washing the sample by using alcohol and deionized water; cleaning with alcohol-containing ultrasonic wave for 8 min, washing, and blow-drying;
(2) preparing plating solutions with two pH values;
(3) sample surface activation treatment: cleaning a sample in an alkaline solution at 50 ℃ for 10 minutes, and performing cold air drying after cleaning with deionized water; subsequently, soaking in 10 wt.% hydrochloric acid solution for 1 minute; washing with deionized water and drying;
the alkaline solution in the step (3) comprises 20g/L of sodium hydroxide, 25g/L of sodium silicate, 30g/L of sodium carbonate and 20g/L of sodium phosphate, the oil removal temperature is 50 ℃, and the time is 10 minutes;
(4) and (3) plating process: adjusting the pH value of the plating solution (1) to 4.7, heating to 80 ℃, and putting the treated sample into the plating solution (1) for pre-plating; after the pre-plating is finished, washing the surface by using deionized water at 80 ℃, immediately putting the surface into a plating solution (2) added with YSZ nano particles for plating, and adjusting the pH value to 7.2; the pre-plating time is 1.5 hours, and the total plating time is 2.5 hours;
YSZ nano dispersion liquid is prepared by firstly adding nano YSZ powder into a small amount of plating solution (2) dissolved with 1.5g/L of lauryl sodium sulfate, and carrying out high-speed stirring and ultrasonic dispersion; wherein the high-speed stirring speed is 800rpm, and the dispersion time is 10 minutes; the first ultrasonic dispersion power is 800W, and the ultrasonic dispersion time is 5 minutes; the second ultrasonic dispersion power is 1200W, and the ultrasonic dispersion time is 20 minutes;
(5) and (3) post-plating treatment: the plated article was heat-treated in a protective atmosphere for 1.0 hour at a temperature of 450 ℃. And cooling the furnace after heat treatment, and taking out the furnace to obtain the product.
Example 3
A nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution comprises the following parameters and the contents of all components:
plating solution (1): 18g/L of nickel sulfate, 29g/L of sodium dihydrogen phosphite, 15g/L of lactic acid, 30g/L of citric acid, 1.6mg/L of thiourea, 11g/L of sodium acetate and 15g/L of succinic acid. The solvent is distilled water, the volume of the solution is the total volume of the mixed solute and the solvent, the pH value is 4.9, and the temperature is 83 ℃.
Plating solution (2): 16g/L of nickel sulfate, 16g/L of sodium dihydrogen phosphite, 20g/L of sodium acetate, 36g/L of sodium citrate dihydrate, 2.5g/L of sodium dodecyl benzene sulfonate, 7g/L of YSZ nanoparticles and 2.0mg/L of thiourea. The volume of the solution is the total volume of the mixed solute and solvent, the pH value is 7.4, and the temperature is 80 ℃.
The plating process of the nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution specifically comprises the following steps:
(1) sample surface pretreatment: the same as example 1;
(2) two plating solutions with different pH values are prepared: the same as example 1;
(3) sample surface activation treatment: the same as example 1;
(4) and (3) plating process: the same as example 1;
(5) and (3) post-plating treatment: the plated article was heat-treated in a protective atmosphere for 1.0 hour at a heat treatment temperature of 400 ℃. And cooling the furnace after heat treatment, and taking out the furnace to obtain the product.
Example 4
A nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution comprises the following parameters and the contents of all components:
plating solution (1): 16g/L of nickel sulfate, 38g/L of sodium dihydrogen phosphite, 20g/L of lactic acid, 36g/L of citric acid, 1.3mg/L of thiourea, 14g/L of sodium acetate and 10g/L of succinic acid. The solvent is distilled water, the volume of the solution is the total volume of the mixed solute and the solvent, the pH value is 4.3, and the temperature is 88 ℃.
Plating solution (2): 21g/L of nickel sulfate, 24g/L of sodium dihydrogen phosphite, 15g/L of sodium acetate, 35g/L of sodium citrate dihydrate, 3.0g/L of sodium dodecyl benzene sulfonate, 15g/L of YSZ nanoparticles and 1.6mg/L of thiourea. The volume of the solution was the total volume of solute and solvent mixed, the pH was 7.5 and the temperature was 82 ℃.
The plating process of the nano YSZ composite plating Ni-P-YSZ/Ni-P alloy plating solution specifically comprises the following steps:
(1) sample surface pretreatment: the same as example 1;
(2) two plating solutions with different pH values are prepared: the same as example 1;
(3) sample surface activation treatment: the same as example 1;
(4) and (3) plating process: the same as example 1;
(5) and (3) post-plating treatment: the plated article was heat-treated in a protective atmosphere for 1.0 hour at a heat treatment temperature of 400 ℃. And cooling the furnace after heat treatment, and taking out the furnace to obtain the product.
The performance parameters of the coatings obtained in examples 1 to 4 were examined and are shown in Table 1:
TABLE 1
| Parameter(s) | Example 1 | Example 2 | Example 3 | Example 4 |
| Microhardness (HV)100) | 480 | 560 | 645 | 730 |
| Coefficient of friction | 0.49 | 0.42 | 0.35 | 0.33 |
| Corrosion inhibition efficiency (3.5 wt.% brine) | 50 | 58 | 85 | 53 |
Claims (8)
1. A Ni-P-YSZ/Ni-P double-layer nano composite plating layer is characterized in that a plating solution (1) comprises the following components: 12-20 g/L of main salt of the plating solution, 28-40 g/L of reducing agent, 27-39 g/L of complexing agent, 10-25 g/L of buffering agent, 8-15 g/L of accelerator, 1-2 mg/L of stabilizer, pH value adjustment of 4.5-5.0 and distilled water as solvent; the plating solution (2) is composed of: 12-22 g/L of plating solution main salt, 15-25 g/L of reducing agent, 20-40 g/L of complexing agent, 10-25 g/L of buffering agent, 1-2 mg/L of stabilizing agent, 1-18 g/L of YSZ nano particles, 1.5-3 g/L of surfactant, 7.0-7.5 of pH value and distilled water as solvent.
2. The Ni-P-YSZ/Ni-P bilayer nanocomposite coating of claim 1 wherein the bath (1) main salt is nickel sulfate;
the reducing agent is sodium dihydrogen phosphite;
the complexing agent is a mixture of lactic acid and citric acid;
the buffer is sodium acetate;
the accelerator is succinic acid;
the stabilizer is thiourea;
the main salt of the plating solution (2) is nickel sulfate;
the reducing agent is sodium dihydrogen phosphite;
the complexing agent is sodium citrate;
the buffer is sodium acetate;
the stabilizer is thiourea;
the surfactant is sodium dodecylbenzenesulfonate.
3. The Ni-P-YSZ/Ni-P double-layer nano composite coating according to claim 2, characterized in that the complexing agent of the coating solution (1) is an acidic coating solution complexing agent, and the components are a mixture of 7-15 g/L of lactic acid and 20-24 g/L of citric acid; the plating solution (2) is an alkaline plating solution complexing agent, and the component of the plating solution is 20-40 g/L of sodium citrate.
4. The process of plating the Ni-P-YSZ/Ni-P nanocomposite coating of claim 1, comprising the steps of:
(1) sample surface pretreatment: grinding and polishing the surface, and washing the surface with alcohol and deionized water; cleaning for 5-10 minutes by using alcohol-containing ultrasonic waves, and then washing and drying;
(2) preparing two different types of plating solutions;
(3) sample surface activation treatment: cleaning a sample in an alkaline solution at 50-60 ℃ for 10-20 minutes, and performing cold air drying after cleaning with deionized water; soaking in 10 wt.% hydrochloric acid solution for 1-2 minutes; washing with deionized water and drying;
(4) and (3) plating process: adjusting the pH value of the plating solution (1) to 4.5-5.0, heating to 80 ℃, and putting the treated sample into the plating solution for pre-plating; after the pre-plating is finished, washing the surface with deionized water at 80 ℃, immediately putting the surface into a plating solution (2) added with YSZ nano particles for plating, and adjusting the pH value to 7.0-7.5; the pre-plating time is 1.0-1.5 hours, and the total plating time is 2.0-2.5 hours;
(5) and (3) post-plating treatment: carrying out heat treatment on the plated part for 1.0-1.5 hours in a protective atmosphere, wherein the heat treatment temperature is 400-450 ℃; and cooling the furnace after the heat treatment, and taking out the furnace to obtain the plated part meeting the requirements of the plating layer.
5. The Ni-P-YSZ/Ni-P double-layer nano composite coating plating process of claim 4, wherein the alkaline solution in the step (3) comprises 30g/L of sodium hydroxide, 20g/L of sodium silicate, 25g/L of sodium carbonate and 20g/L of sodium phosphate; the oil removing temperature is 60-90 ℃ and the time is 30 minutes.
6. The plating process of the Ni-P-YSZ/Ni-P double-layer nano composite plating layer according to claim 4, characterized in that the YSZ nano dispersion liquid is prepared by firstly adding nano YSZ powder into a plating solution (2) dissolved with 1.5-3 g/L sodium dodecyl sulfate, and carrying out high-speed stirring and ultrasonic dispersion.
7. The plating process of the Ni-P-YSZ/Ni-P double-layer nano composite plating layer according to claim 4, characterized in that the high-speed stirring rotation speed is 500-1000 rpm, and the dispersion time is 10-15 minutes; the first ultrasonic dispersion power is 600-1000W, and the ultrasonic dispersion time is 5-10 minutes; the second ultrasonic dispersion power is 1000-1500W, and the ultrasonic dispersion time is 15-20 minutes.
8. The process of claim 4, wherein the protective atmosphere in step (5) is nitrogen or argon.
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| CN114182241A (en) * | 2021-11-24 | 2022-03-15 | 国网浙江省电力有限公司舟山供电公司 | Ni-W-P/Ni-P nano cerium oxide composite anticorrosive coating and process |
| CN114836739A (en) * | 2022-04-20 | 2022-08-02 | 武汉纺织大学 | Preparation method of Ni-P-PTFE nano composite coating of bearing steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182241A (en) * | 2021-11-24 | 2022-03-15 | 国网浙江省电力有限公司舟山供电公司 | Ni-W-P/Ni-P nano cerium oxide composite anticorrosive coating and process |
| CN114836739A (en) * | 2022-04-20 | 2022-08-02 | 武汉纺织大学 | Preparation method of Ni-P-PTFE nano composite coating of bearing steel |
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