A Preparation Method for an Intelligent In-Situ Self-Monitoring Rare Earth-Ni-CrN Based Composite Coating

Abstract

The present invention discloses a preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating, comprising the following steps: Step 1, pretreatment of the substrate of the in-situ luminescent composite coating; Step 2, preparation of the electrolyte for electrochemical deposition; Step 3, co-deposition to prepare an in-situ luminescent rare earth composite nickel-based coating; Step 4, coupling with PVD technology to construct a functional composite coating with a luminescent coating coupled with hard CrN. The present invention solves the problems in the prior art that the methods for intelligently monitoring the wear and corrosion conditions of coatings are complex, costly and difficult to monitor.

Description

Technical Field

[0001] The present invention belongs to the technical field of surface treatment, and particularly relates to a preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating. Background Art

[0002] Magnesium alloys have a low density, a high unit elastic modulus, a high compressive yield limit, good impact toughness, a large flexural strength, a large anti-high energy particle penetration ability, good plasticity, are easy to process and deform, and can be welded and formed. The excellent properties of magnesium alloys make them the most ideal structural materials in many fields, such as aerospace, automotive, military, electronics, and computer fields. However, material corrosion causes great harm to materials. Due to the interaction between materials and the environment, huge economic losses are caused every year due to material corrosion. Therefore, surface coatings are widely used because they play a role in extending the life of parts and improving the mechanical properties of parts. However, how to quickly and accurately detect the corrosion situation of the coating has become an urgent problem to be solved at present. So far, researchers have detected the wear and corrosion of coatings and parts through various methods, such as oil analysis, acoustic emission, vibration, vibration sensors, and light sensors. However, the luminescent coating is a relatively new method among these technologies. It has the advantages of low cost, high visibility, and high adaptability. Therefore, the luminescent coating is considered to be a very promising method for detecting wear and corrosion at present.

[0003] At present, the luminescent coating is a new type of coating that can quickly detect the wear and corrosion of the coating, and has the characteristics of high accuracy, on-time monitoring, and low cost. It has good application prospects in the application of quickly monitoring the wear and corrosion of coatings. In recent years, people have been trying to find a fast and economical method to monitor the wear and corrosion of coatings and parts. Among the various methods for detecting the wear and corrosion of coatings and parts at present, using an in-situ self-luminescent coating for monitoring is the simplest and lowest-cost. Therefore, the health of the coating structure can be monitored by electrochemically depositing a luminescent system nickel-based coating on the magnesium alloy. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating, which solves the problems that the methods for intelligently monitoring the wear and corrosion of coatings in the prior art are complex, costly, and difficult to monitor.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is a preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating, including the following steps:

[0006] Step 1: Pretreatment of the substrate of the in-situ luminescent composite coating;

[0007] Step 2: Prepare the electrolyte for electrochemical deposition;

[0008] Step 3: Co - deposit to prepare an in - situ luminescent rare - earth composite nickel - based coating;

[0009] Step 4: Couple with PVD technology to construct a functional composite coating that couples a luminescent coating with hard CrN.

[0010] Further, the specific operation of Step 1 is as follows:

[0011] First, clean the substrate in analytical - grade acetone with ultrasonic waves for 25 - 35 minutes, then perform alkaline cleaning in a water - bath at 60 - 70 °C for 25 - 35 minutes, followed by pickling for 10 - 20 seconds, then perform activation treatment in a water - bath at 70 - 80 °C for 25 - 35 minutes, and finally perform zinc - dipping treatment in a water - bath at 70 - 80 °C for 25 - 35 minutes.

[0012] Further, the electrolyte solution in Step 2 is a nickel - plating solution, and the blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare - earth element luminescent particles in the electrolyte is 6 - 10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110 - 130 g / L, and the concentrations of ammonium fluoride, ammonium citrate, saccharin sodium, sodium dodecyl sulfate, and ammonia in the electrolyte are 35 - 45 g / L, 8 - 12 g / L, 2 - 4 g / L, 0.08 - 0.12 g / L, and 35 - 45 ml / L, respectively.

[0013] Further, the specific operation of Step 3 is as follows:

[0014] Fix the treated substrate on the cathode graphite located in the electrolyte, fix the nickel sheet on the anode electrode, and then control the electrolysis temperature at 40 - 50 °C through a constant - temperature water - bath; the deposition time is 25 - 35 minutes, and electrochemically deposit a luminescent rare - earth composite nickel - based coating containing blue phosphor BaMgAl 10 0 17 :Eu 2+ on the substrate surface.

[0015] Further, the specific operation of Step 4 is as follows:

[0016] By using the DC reactive magnetron sputtering method to couple and deposit a functional coating of hard CrN on the surface of the nickel-based coating, the specific deposition process is as follows: the deposition temperature is 180 - 220 °C, a certain content of Ar and N2 is introduced during the deposition process, the content ratio of Ar and N2 is (36 - 44 sccm) : (18 - 22 sccm), the working pressure is 2.3 - 2.7 Pa, the deposition power is 130 - 170 W, the deposition time is 80 - 100 min. Under the action of the magnetic field, nitrogen ions in the deposition chamber react with chromium ions in the target material to couple a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating.

[0017] Further, the substrate is a magnesium alloy.

[0018] Further, in the second step, the method of constant-temperature heating and stirring for 8 - 12 minutes is adopted to fully dissolve the blue phosphor BaMgAl 10 0 17 :Eu 2+ rare-earth element particles in the electrolyte.

[0019] Further, in the third step, the distance between the electrodes is 6 - 10 mm, and the distance between the lower end of the electrode in the electrolyte and the liquid surface is 10 - 15 mm.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention uses AZ91D magnesium alloy as the substrate, selects the blue phosphor BaMgAl 10 0 17 :Eu 2+ luminescent rare-earth element particles as the dopant, and adopts the electrochemical deposition process to deposit a luminescent rare-earth nickel-based coating containing the blue phosphor BaMgAl 10 0 17 :Eu 2+ on the magnesium alloy, which can effectively detect the wear and corrosion of the coating, greatly expand its applications in reducing costs, monitoring corrosion, etc. Secondly, a functional composite coating coupling a luminescent coating and hard CrN is constructed on the luminescent rare-earth nickel-based coating by physical vapor deposition (PVD) technology. In addition, compared with other methods for monitoring the wear and corrosion of coatings, the present invention has the advantages of simple operation, low cost, timely monitoring, etc., and will provide a new way for the application of monitoring the wear and corrosion of coatings. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a flowchart of the preparation method of the embodiment of the present invention.

[0024] Figure 2 It is the luminescence diagram of the luminescent rare-earth nickel-based coating under ultraviolet (UV) light irradiation in the embodiment of the present invention. 10 0 17 :Eu 2+ The luminescence diagram of the luminescent rare-earth nickel-based coating, where (a) is the 6 g / L BaMgAl 10 0 17 :Eu 2+ The luminescence diagram of the luminescent rare-earth nickel-based coating prepared in Example 7, (b) is the 8 g / L BaMgAl 10 0 17 :Eu 2+ The luminescence diagram of the luminescent rare-earth nickel-based coating prepared in Example 8, (c) is the 10 g / L BaMgAl 10 0 17 :Eu 2+ The luminescence diagram of the luminescent rare-earth nickel-based coating.

[0025] Figure 3 It is the luminescence diagram of the luminescent rare-earth nickel-based coating under ultraviolet (UV) light irradiation in Example 1 of the present invention.

[0026] Figure 4 It is the model diagram in the embodiment of the present invention; where (a) is the appearance of the coating in the non-worn area; (b) is the appearance of the coating in the damaged area after wear.

[0027] Figure 5 The friction performance diagram of the rare-earth luminescent particle composite Ni-based coupled hard CrN functional coating in Example 8 of the present invention.

[0028] Figure 6 It is the corrosion performance diagram of the rare-earth luminescent particle composite Ni-based coupled hard CrN functional coating in Example 8 of the present invention; where (a) is the polarization curve, (b) is the electrochemical impedance spectrum. Specific embodiments

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] The present invention provides a preparation method for an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating. Refer to Figure 1 , and the specific steps are as follows:

[0031] Step 1. Pretreatment of the substrate for the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy in analytical pure acetone with ultrasonic waves for 25 to 35 minutes to remove the native oxide layer and particulate residues on its surface. Then, perform an alkaline wash in a water bath at 60 to 70 °C for 25 to 35 minutes to remove the organic grease and oil stains on its surface and improve the surface quality of the substrate for subsequent treatment. After that, perform an acid wash for 10 to 20 seconds to ensure that the alkaline wash solution on the substrate surface is thoroughly washed off. Then, perform an activation treatment in a water bath at 70 to 80 °C for 25 to 35 minutes to quickly remove the oxides and hydroxides generated on the substrate surface and form a microporous oxide film with a certain stability on its surface. Finally, perform a zinc immersion treatment in a water bath at 70 to 80 °C for 25 to 35 minutes. The zinc immersion treatment can remove the surface oxides and prepare a zinc metal transition layer with good bonding performance on its surface to undertake the subsequent electroplating treatment;

[0032] Step 2. Prepare the electrolyte for electrochemically deposition: The electrolyte is a nickel plating solution, and the concentration of the blue fluorescent powder BaMgAl 10 0 17 :Eu 2+ rare earth element luminescent particles in the electrolyte is 6 - 10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110 - 130 g / L, and the concentrations of ammonium fluoride, ammonium citrate, saccharin sodium, sodium dodecyl sulfate, and ammonia in the electrolyte are 35 - 45 g / L, 8 - 12 g / L, 2 - 4 g / L, 0.08 - 0.12 g / L, and 35 - 45 ml / L respectively. When the concentration of the blue fluorescent powder BaMgAl 10 0 17 :Eu 2+ rare earth element luminescent particles is 6 - 10 g / L, its phosphor can be well embedded in the nickel coating, while the adhesion will be greatly reduced when the concentration is lower or higher than this range. The concentration of nickel sulfate hexahydrate as the main salt in the electrolyte should not be too high. Too high a main salt concentration will reduce the stability of the electrolyte, easily form a rough coating and even may precipitate spongy nickel. Therefore, the present invention selects a concentration of 110 - 130 g / L. Ammonium citrate as a complexing agent in the electrolyte can make Ni +Generate a relatively stable complex to reduce the concentration of free Ni in the electrolyte + to prevent the precipitation of nickel phosphite. Both too high and too low concentrations will affect the deposition rate of Ni + . Sodium saccharin and sodium dodecyl sulfate are used as buffers in this electrolyte. The main purpose is to stabilize the pH value of the electrolyte to ensure the quality of the coating. Too high a concentration will affect the electrolyte and cause a decrease in the deposition rate, while too low a concentration will affect the life of the electrolyte. Ammonia water is used as a pH regulator in the electrolyte. Too high a pH value will affect the quality of the coating. When the pH value is controlled between 6 and 7 by adding ammonia water, the deposition rate is the highest. Therefore, the concentration of ammonia water is controlled at 35-45 ml / L. Ammonium fluoride is used as a corrosion inhibitor in the electrolyte. It can react with metal ions to form a magnesium fluoride protective film, which can reduce its corrosion rate. However, both too high and too low concentrations will cause a significant decrease in the deposition rate.

[0033] Step 3: Co-deposit to prepare an in-situ luminescent rare earth composite nickel-based coating: Fix the treated magnesium alloy on the cathode graphite and the nickel sheet on the anode electrode. Then, through a constant temperature water bath, the temperature is controlled at 40-50 °C and the deposition time is 25-35 minutes. Electrochemically deposit a luminescent rare earth nickel-based coating containing blue phosphor BaMgAl 10 0 17 :Eu 2+ on the surface of the magnesium alloy; too long or too short deposition time will cause the rare earth particles to not be fully embedded in the nickel-based coating. The rare earth luminescent particles can be evenly distributed in the nickel-based coating only at a certain time and temperature. Compared with other preparation methods, co-deposition to prepare an in-situ luminescent rare earth composite nickel-based coating has the advantages of being fast, having low difficulty, being efficient, and being able to meet metallurgical bonding.

[0034] Step 4. Construct a functional composite coating by coupling PVD technology to deposit a hard CrN coating on a luminescent coating: By using the DC reactive magnetron sputtering method, deposit a functional coating of hard CrN on the surface of the nickel-based luminescent coating. The deposition process parameters are as follows: the deposition temperature is 180 - 220 °C, during the deposition process, a certain content of Ar and N2 are introduced, and the content ratio is (36 - 44 sccm) : (18 - 22 sccm), the working pressure is 2.3 - 2.7 Pa, the deposition power is 130 - 170 W, and the deposition time is 80 - 100 min. If the power is too high, the film quality will deteriorate, resulting in the film not adhering to the nickel-based coating. Under the action of the magnetic field, nitrogen ions in the deposition chamber react with chromium ions in the target material to deposit a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating. The functional coating of hard CrN is generally the most commonly used protective coating for tools and drills, which can meet the cutting function of tools and the drilling function of drills. However, in the present invention, a functional composite coating of hard CrN is prepared by coupling PVD technology as a hard protective coating for the rare-earth luminescent coating, and there is no relevant record in this field.

[0035] Further, in Step 1, the size of the AZ91D magnesium alloy is 40 mm in length, 18 mm in width, and 5 mm in thickness.

[0036] Further, in Step 2, constant-temperature heating and stirring for 8 - 12 minutes are used to dissolve the blue phosphor BaMgAl 10 0 17 :Eu 2+ rare-earth element particles fully dissolve in the electrolyte. The length of the stirring time will affect the solubility of the blue phosphor BaMgAl 10 0 17 :Eu 2+ rare-earth element particles in the plating solution. Only by controlling a reasonable heating and stirring time can the rare-earth luminescent particles be fully dissolved.

[0037] Further, in Step 3, the distance between the electrodes is maintained at 6 - 10 mm. If the electrode distance is too close, it will affect the progress of the electroplating reaction experiment. And the distance from the lower end of the electrode to the liquid surface of the electrolyte is 10 - 15 mm, which is also to ensure that the sample can be fully dissolved in the electrolyte.

[0038] Select BaMgAl0 17 :Eu 2+ rare-earth element light-emitting particles as a dopant because BaMgAl 10 0 17 :Eu 2+ rare-earth element light-emitting particles will not introduce other impurity ions and can be fully dispersed in the nickel plating electrolyte, and BaMgAl 10 0 17 :Eu2+ Rare earth element photosensitive particles do not participate in the electrode reaction.

[0039] Example 1

[0040] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 25 minutes to remove the native oxide layer and particle residues on its surface. Then perform alkaline washing in a water bath at 60°C for 35 minutes to remove organic grease and oil stains on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 10 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment at 70°C in a water bath for 35 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment at 70°C in a water bath for 35 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0041] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 6 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 35 g / L, 8 g / L, 2 g / L, 0.08 g / L, and 35 ml / L respectively;

[0042] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 40 °C; deposit for 35 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0043] Step 4. Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 180°C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 36:18 sccm, the working gas pressure is 2.3 Pa, the deposition power is 130 W, and the deposition time is 100 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0044] Example 2

[0045] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 35 minutes to remove the native oxide layer and particulate residues on its surface. Then perform alkaline washing in a water bath at 70°C for 25 minutes to remove organic grease and oil stains on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 20 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment in a water bath at 80°C for 25 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment in a water bath at 80°C for 25 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0046] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element photoluminescent particles in the electrolyte is 10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 130 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 42 g / L, 12 g / L, 4 g / L, 0.12 g / L, and 45 ml / L, respectively;

[0047] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 50 °C; deposit for 25 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0048] Step 4. Construct a functional composite coating coupling a luminescent coating with hard CrN by using PVD technology: A functional coating of hard CrN is deposited on the surface of the luminescent rare-earth nickel-based coating by using DC reactive magnetron sputtering. The deposition process parameters are as follows: deposition temperature is 220 °C, a certain content of Ar and N2 is introduced during deposition, and the content ratio is 44:22 sccm, working pressure is 2.7 Pa, deposition power is 170 W, deposition time is 80 min. Under the action of a magnetic field, nitrogen ions in the deposition chamber react with chromium ions in the target to deposit a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating.

[0049] Example 3

[0050] Step 1. Pretreatment of the substrate for the in-situ luminescent composite coating: First, the AZ91D magnesium alloy is cleaned in analytical pure acetone by ultrasonic for 25 minutes to remove the native oxide layer and particulate residues on its surface. Then, it is alkali-washed in a water bath at 60 °C for 35 minutes to remove the organic grease and oil stains on its surface and improve the surface quality of the substrate for subsequent treatment. After that, pickling is carried out for 10 seconds to ensure that the alkali washing solution on the substrate surface is thoroughly washed off. Then, activation treatment is carried out in a water bath at 70 °C for 35 minutes to quickly remove the oxides and hydroxides generated on the substrate surface and form a microporous oxide film with a certain stability on its surface. Finally, immersion zinc treatment is carried out in a water bath at 70 °C for 35 minutes. The immersion zinc treatment can remove the surface oxides and prepare a zinc metal transition layer with good bonding performance on its surface to undertake the subsequent electroplating treatment.

[0051] Step 2. Prepare the electrolyte for electrochemical deposition: The electrolyte solution is a nickel plating solution, and the concentration of the blue phosphor BaMgAl 10 0 17 :Eu 2+ rare-earth element luminescent particles in the electrolyte is 8 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, saccharin sodium, sodium dodecyl sulfate, and ammonia water in the electrolyte are 35 g / L, 8 g / L, 2 g / L, 0.08 g / L, and 35 ml / L, respectively.

[0052] Step 3. Co-deposit to prepare an in-situ luminescent rare-earth composite nickel-based coating: The treated magnesium alloy is fixed on the cathode graphite, and the nickel sheet is fixed on the anode electrode. Then, through a constant-temperature water bath, the electrolysis temperature is controlled at 40 °C; the deposition time is 35 minutes, and an in-situ luminescent rare-earth nickel-based coating containing blue phosphor BaMgAl 10 0 17 :Eu 2+ is electrochemically deposited on the surface of the magnesium alloy.

[0053] Step 4: Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 180 °C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 36:18 sccm, the working gas pressure is 2.3 Pa, the deposition power is 130 W, and the deposition time is 100 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0054] Example 4

[0055] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 35 minutes to remove the native oxide layer and particulate residues on its surface. Then perform alkaline washing in a water bath at 70°C for 25 minutes to remove organic grease and oil stains on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 20 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment in a water bath at 80°C for 25 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment in a water bath at 80°C for 25 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0056] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 8 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 130 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 42 g / L, 12 g / L, 4 g / L, 0.12 g / L, and 45 ml / L, respectively;

[0057] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 50°C; deposit for 25 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0058] Step 4. Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 220°C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 44:22 sccm, the working gas pressure is 2.7 Pa, the deposition power is 170 W, and the deposition time is 80 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0059] Example 5

[0060] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 25 minutes to remove the native oxide layer and particle residues on its surface. Then perform alkaline washing in a water bath at 60°C for 35 minutes to remove organic grease and oil stains on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 10 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment at 70°C in a water bath for 35 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment at 70°C in a water bath for 35 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0061] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 35 g / L, 8 g / L, 2 g / L, 0.08 g / L, and 35 ml / L, respectively;

[0062] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 40 °C; deposit for 35 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0063] Step 4. Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 180°C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 36:18 sccm, the working gas pressure is 2.3 Pa, the deposition power is 130 W, and the deposition time is 100 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0064] Example 6

[0065] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 35 minutes to remove the native oxide layer and particulate residues on its surface. Then perform alkaline washing in a water bath at 70°C for 25 minutes to remove organic grease and oil stains on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 20 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment in a water bath at 80°C for 25 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment in a water bath at 80°C for 25 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0066] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 6 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 130 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 42 g / L, 12 g / L, 4 g / L, 0.12 g / L, and 45 ml / L, respectively;

[0067] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 50°C; deposit for 25 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0068] Step 4: Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 220°C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 44:22 sccm, the working gas pressure is 2.7 Pa, the deposition power is 170 W, and the deposition time is 80 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0069] Example 7

[0070] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 30 minutes to remove the native oxide layer and particle residues on its surface. Then perform alkaline washing in a water bath at 65°C for 30 minutes to remove organic grease and oil on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 15 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment at 75°C in a water bath for 30 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment at 75°C in a water bath for 30 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0071] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 6 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 120 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 40 g / L, 10 g / L, 3 g / L, 0.1 g / L, and 40 ml / L respectively;

[0072] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 45°C; deposit for 30 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0073] Step 4. Couple PVD technology to construct a functional composite coating of luminescent coating coupled with hard CrN: A DC reactive magnetron sputtering method is used to couple and deposit a functional coating of hard CrN on the surface of the luminescent rare earth nickel-based coating. The deposition process is as follows: a deposition temperature of 200 °C, a certain amount of Ar and N2 are introduced during the deposition process, and the content ratio is 40:20 sccm, the working gas pressure is 2.5 Pa, the deposition power is 150 W, and the deposition time is 90 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target material to couple the functional composite coating of hard CrN on the luminescent rare earth nickel-based coating.

[0074] Example 8

[0075] Step 1. Pretreatment of the substrate of the in-situ luminescent composite coating: First, clean the AZ91D magnesium alloy with ultrasonic waves in analytical pure acetone for 30 minutes to remove the native oxide layer and particle residues on its surface. Then perform alkaline washing in a water bath at 65°C for 30 minutes to remove organic grease and oil on its surface and improve the surface quality of the subsequent treatment of the substrate. After that, pickle it for 15 seconds to ensure that the alkaline washing liquid on the surface of the substrate is fully washed off. Perform activation treatment at 75°C in a water bath for 30 minutes again to quickly remove the oxides and hydroxides produced on the surface of the substrate and form a microporous oxide film with a certain stability on its surface. Finally, perform zinc immersion treatment at 75°C in a water bath for 30 minutes. The zinc immersion treatment can remove the oxides on the surface and prepare a zinc metal transition layer with good bonding properties on its surface to undertake subsequent electroplating treatment;

[0076] Step 2: Prepare the electrolyte for electrochemical deposition: the electrolyte solution is nickel plating solution, and its blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element photoluminescent particles in the electrolyte is 8 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 120 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 40 g / L, 10 g / L, 3 g / L, 0.1 g / L, and 40 ml / L, respectively;

[0077] Step 3: Prepare in-situ luminescent rare earth composite nickel-based coating by co-deposition: fix the treated magnesium alloy on the cathode graphite, fix the nickel sheet on the anode electrode, and then pass through a constant temperature water bath with the electrolysis temperature controlled at 45°C; deposit for 30 minutes, and electrochemically deposit blue phosphor BaMgAl on the surface of the magnesium alloy. 10 0 17 :Eu 2+ Luminescent rare earth nickel-based coating;

[0078] Step 4. Construct a functional composite coating coupling a luminescent coating and hard CrN by using PVD technology: A functional coating of hard CrN is deposited by DC reactive magnetron sputtering on the surface of the luminescent rare-earth nickel-based coating. The deposition process parameters are as follows: deposition temperature is 200 °C, a certain amount of Ar and N2 are introduced during deposition, and their flow rate ratio is 40:20 sccm, working pressure is 2.5 Pa, deposition power is 150 W, deposition time is 90 min. Under the action of a magnetic field, nitrogen ions in the deposition chamber react with chromium ions in the target to deposit a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating.

[0079] Example 9

[0080] Step 1. Pretreatment of the substrate for the in-situ luminescent composite coating: First, the AZ91D magnesium alloy is ultrasonically cleaned in analytical pure acetone for 30 minutes to remove the native oxide layer and particulate residues on its surface. Then, it is alkali-washed in a water bath at 65 °C for 30 minutes to remove the organic grease and oil stains on its surface, improving the surface quality for subsequent substrate treatment. After that, pickling is carried out for 15 seconds to ensure that the alkali washing solution on the substrate surface is thoroughly removed. Then, activation treatment is carried out in a water bath at 75 °C for 30 minutes to quickly remove the oxides and hydroxides generated on the substrate surface and form a microporous oxide film with a certain stability on its surface. Finally, immersion zinc treatment is carried out in a water bath at 75 °C for 30 minutes. The immersion zinc treatment can remove the surface oxides and prepare a zinc metal transition layer with good bonding performance on its surface to undertake the subsequent electroplating treatment;

[0081] Step 2. Prepare the electrolyte for electrochemical deposition: The electrolyte solution is a nickel plating solution, and the concentration of the blue phosphor BaMgAl 10 O 17 :Eu 2+ rare-earth element light-emitting particles in the electrolyte is 10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 120 g / L, and the concentrations of other ammonium fluoride, ammonium citrate, saccharin sodium, sodium dodecyl sulfate, and ammonia water in the electrolyte are 40 g / L, 10 g / L, 3 g / L, 0.1 g / L, and 40 ml / L respectively;

[0082] Step 3. Co-deposit to prepare an in-situ luminescent rare-earth composite nickel-based coating: The treated magnesium alloy is fixed on the cathode graphite, and the nickel sheet is fixed on the anode electrode. Then, through a constant-temperature water bath, the electrolysis temperature is controlled at 45 °C; the deposition time is 30 minutes, and an in-situ luminescent rare-earth nickel-based coating containing the blue phosphor BaMgAl 10 0 17 :Eu 2+ is electrochemically deposited on the surface of the magnesium alloy;

[0083] Step 4. Construct a functional composite coating coupling a luminescent coating with hard CrN by PVD technology: A functional coating of hard CrN is coupled and deposited on the surface of the luminescent rare-earth nickel-based coating by using the DC reactive magnetron sputtering method. The deposition process is as follows: the deposition temperature is 200 °C, a certain content of Ar and N2 is introduced during the deposition process, and the content ratio is 40:20 sccm. The working pressure is 2.5 Pa, the deposition power is 150 W, and the deposition time is 90 min. Under the action of the magnetic field, nitrogen ions in the deposition chamber react with chromium ions in the target material to couple a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating.

[0084] Experimental Example 1

[0085] A camera was used to take optical photos of the luminescent rare-earth nickel-based coatings with different concentrations of BaMgAl 10 0 17 :Eu 2+ rare-earth element light-emitting particles, and the distribution of rare-earth element Eu 2+ light-emitting particles in the luminescent rare-earth nickel-based coating was observed under ultraviolet (UV) light irradiation. Figure 2 Optical photos of the distribution of rare-earth element Eu 2+ light-emitting particles in the luminescent rare-earth nickel-based coating at different concentrations.

[0086] From Figure 2 it can be seen that in the luminescent rare-earth nickel-based coating, the rare-earth element Eu 2+ light-emitting particles are more evenly distributed in the luminescent rare-earth nickel-based coating compared to when 6 g / L and 10 g / L of BaMgAl 10 0 17 :Eu 2+ rare-earth element light-emitting particles were added, and they can be more clearly shown under ultraviolet (UV) light irradiation. As Figure 2 shown, as the concentration of rare-earth element Eu 2+ light-emitting particles in the electrolyte increases, the coverage rate of rare-earth element Eu 2+ light-emitting particles in the coating first increases and then decreases. The maximum coverage rate reaches 14.8% at 8 g / L, and then when the concentration of rare-earth element Eu 2+ light-emitting particles in the coating is 10 g / L, its coverage rate in the nickel-based coating drops to 8.9%. This phenomenon can be explained as follows: at lower concentrations, most of the blue BAM phosphor particles can co-deposit with Ni, and aggregation and precipitation easily occur at a certain concentration (6 - 7 g / L). However, large aggregates are difficult to remain on the electrode surface, allowing the nickel-based film to grow continuously. The combination of these two factors results in a relatively low particle content in the composite coating at a certain level.

[0087] Experimental Example 2

[0088] It can be clearly seen from Figure 3 that although the luminescent rare earth nickel-based coating prepared by changing a certain parameter under the same conditions can be successfully prepared, compared with Figure 2 in the example of 10 0 17 :Eu 2+ the luminescent particles of rare earth elements, the effect presented under the same lowest concentration is worse, with fewer rare earth particles attached. Only a small area shows a blue color layer under ultraviolet light. According to the comparison, when the concentration of the luminescent particles of rare earth elements in 10 0 17 :Eu 2+ remains unchanged, the process of Example 7 is relatively better, which can embed the luminescent particles of rare earth elements in 10 0 17 :Eu 2+ uniformly into the nickel-based coating, and the hard CrN functional coating can also be well deposited on the nickel-based coating.

[0089] Example 3

[0090] The 3Dmax software is used to build a model of the prepared coating. As Figure 4 shown, it can be seen from Figure 4 (a) that the rare earth luminescent particles in the coating cannot be seen under visible light. In contrast, the colored light observed in Figure 4 (b) indicates that the coating has been worn / corroded. Therefore, by using a portable ultraviolet flashlight, the coating can be regularly inspected even when the component is still in use. This provides a more convenient way for engineering applications.

[0091] Figure 4 Shows a schematic model of the wear and corrosion of the luminescent rare earth nickel-based coating coupled with the hard CrN functional coating. Figure 4 (a) shows that the luminescent rare earth nickel-based coating is used as an intermediate coating, and a hard CrN functional coating is deposited on the luminescent rare earth nickel-based coating. It still looks normal under visible light and ultraviolet (UV) light irradiation, indicating that the coating has not been worn or corroded. For Figure 4 the composite coating in

[0092] Experiment Example 4

[0093] Si3N4 was selected as the counter material, and the friction and wear tests were carried out on a ball-disk type high-temperature friction and wear testing machine rotating at THT1000. The friction and wear test results are as Figure 5 shown. And the corrosion performance of the rare earth luminescent particle composite Ni-based coupled hard CrN functional coating was tested by using an electrochemical workstation (CHI660E, China). The experiment was carried out using a classical three-electrode system for testing. The reference electrode was a saturated KCl electrode, the counter electrode was a platinum electrode, and the sample was the working electrode.

[0094] Figure 5 is doped with different concentrations of BaMgAl 10 0 17 :Eu 2+ The friction coefficients of the rare earth luminescent particle composite Ni-based coupled hard CrN functional coating of rare earth element luminescent particles are 0.452 (6 g / L), 0.370 (8 g / L), and 0.419 (10 g / L), respectively. The results show that when BaMgAl 10 0 17 :Eu 2+ The addition amount of rare earth element luminescent particles is 8 g / L, and the friction coefficient of the coupled hard CrN functional coating is the lowest. The main reason is that BaMgAl released from the Ni-CrN composite coating 10 0 17 :Eu 2+ rare earth element luminescent particles can play a role in lubrication to cause rolling friction, thus leading to a decrease in the friction coefficient. And after the wear test, the phosphor can still be well embedded in the luminescent rare earth nickel-based coating. In addition, no voids were found at the interface, indicating good adhesion between the composite coating and the magnesium alloy. Thus, the rare earth luminescent particle composite Ni-based coupled hard CrN functional coating has better wear resistance.

[0095] Experimental Example 5

[0096] The corrosion behavior of the composite coating was analyzed by basic parameters such as electrochemical impedance spectroscopy and potentiodynamic polarization curves. The test frequency range of the electrochemical impedance spectroscopy was 10 -2 ~ 10 5 Hz, and the amplitude was 0.02 V. The sample area was controlled within 1 ± 0.1 cm 2 , and the corrosion performance in 3.5 wt.% NaCl solution for 1 h was measured. The results are as Figure 6 shown.

[0097] Figure 6 shows the corrosion behavior of the rare earth luminescent particle composite Ni-based coupled hard CrN functional coating in 3.5 wt.% NaCl solution. From Figure 6It can be seen that the rare-earth luminescent particle composite Ni-based coupled hard CrN functional coating in Example 8 has excellent corrosion resistance. The corrosion performance of the rare-earth luminescent particle composite Ni-based coupled hard CrN functional coating prepared in Example 8 was tested in a 3.5 wt.% NaCl solution. The experiment was carried out using a classical three-electrode system, where the reference electrode was a saturated KCl electrode, the counter electrode was a platinum electrode, and the sample was the working electrode. The corrosion behavior of the composite coating was analyzed through the basic parameters of electrochemical impedance spectroscopy and potentiodynamic polarization curves. The test frequency range of the electrochemical impedance spectroscopy was 10 -2 ~ 10 5 Hz, and the amplitude was 0.02 V. The sample area was controlled within 1 ± 0.1 cm 2 , and the corrosion performance after soaking in a 3.5 wt.% NaCl solution for 1 h was measured respectively. Generally, the more positive the polarization potential of the coating, the stronger its corrosion resistance. Figure 6 (a) is the polarization curve of the hard CrN functional coating coupled on the luminescent rare-earth nickel-based coating of 8 g / L BaMgAl0 17 :Eu 2+ rare-earth element luminescent particles. Compared with the coupled hard CrN functional coatings prepared at other concentrations, its corrosion resistance is better. To further characterize the corrosion resistance of the composite coating, electrochemical impedance spectroscopy (EIS) was used to study the corrosion resistance of the coating. Theoretically, the larger the diameter of the capacitance loop, the larger the resistance value of the coating, and the stronger the corrosion resistance of the coating, as shown in Figure 6 (b). As the deposition current increases, the diameter line of the capacitance loop of the functional coating first increases and then decreases, indicating that the corrosion resistance of the coating first increases and then decreases. However, when the corrosion performance of the coupled hard CrN functional coating prepared in Example 8 was tested in a 3.5 wt.% NaCl solution, it was found that the rare-earth luminescent particle composite Ni-based coupled hard CrN functional coating in Example 8 showed the most excellent corrosion resistance after soaking for 1 h.

[0098] It can be seen that by using the electrochemical deposition process, a luminescent rare-earth nickel-based coating containing the blue phosphor BaMgAl0 17 :Eu 2+ was deposited on the AZ91D magnesium alloy, and then the hard CrN functional coating was coupled using PVD technology. It can effectively monitor the wear and corrosion of the coating, greatly expanding its application in reducing costs, monitoring corrosion, replacing service parts to improve processing accuracy and reduce the risk of failure accidents.

[0099] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the partial description of the method embodiment.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating, characterized in that, It includes the following steps: Step 1: Pretreatment of the substrate of the in-situ luminescent composite coating; Step 2: Preparation of the electrolyte for electrochemical deposition; Step 3: Co-deposition to prepare the in-situ luminescent rare-earth composite nickel-based coating; Step 4: Coupling the PVD technology to construct a functional composite coating coupling the luminescent coating with hard CrN; Specifically, Step 1 is as follows: First, the substrate is cleaned in analytical pure acetone by ultrasonic for 25 - 35 minutes, then alkali-washed in a water bath at 60 - 70 °C for 25 - 35 minutes, pickled for 10 - 20 seconds, then activated in a water bath at 70 - 80 °C for 25 - 35 minutes, and finally immersed in zinc in a water bath at 70 - 80 °C for 25 - 35 minutes; The electrolyte solution in the second step is a nickel plating solution, and the blue phosphor BaMgAl 10 0 17 :Eu 2+ The concentration of rare earth element luminescent particles in the electrolyte is 6-10 g / L, the concentration of nickel sulfate hexahydrate in the electrolyte is 110-130 g / L, and the concentrations of ammonium fluoride, ammonium citrate, sodium saccharin, sodium dodecyl sulfate, and ammonia water in the electrolyte are 35-45 g / L, 8-12 g / L, 2-4 g / L, 0.08-0.12 g / L, and 35-45 ml / L, respectively; Specifically, Step 4 is as follows: A functional coating of hard CrN is coupled and deposited on the surface of the nickel-based coating by using the DC reactive magnetron sputtering method. The specific deposition process is: the deposition temperature is 180 - 220 °C, a certain content of Ar and N2 is introduced during the deposition process, the content ratio of Ar and N2 is (36 - 44 sccm) : (18 - 22 sccm), the working pressure is 2.3 - 2.7 Pa, the deposition power is 130 - 170 W, the deposition time is 80 - 100 min. Under the action of the magnetic field, the nitrogen ions in the deposition chamber react with the chromium ions in the target to couple a functional composite coating of hard CrN on the luminescent rare-earth nickel-based coating.

2. The preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating according to claim 1, characterized in that, Specifically, Step 3 is as follows: Fix the processed substrate on the cathode graphite located in the electrolyte, fix the nickel sheet on the anode electrode, and then control the electrolysis temperature at 40-50 °C through a constant temperature water bath; the deposition time is 25-35 minutes, and electrochemically deposit a luminescent rare earth composite nickel-based coating containing blue phosphor BaMgAl 10 0 17 :Eu 2+ on the substrate surface.

3. The preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating according to claim 1, characterized in that, The substrate is AZ91D magnesium alloy.

4. The preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating according to claim 1, characterized in that In the second step, a method of heating and stirring at a constant temperature for 8 to 12 minutes is used to make the blue phosphor BaMgAl 10 0 17 :Eu 2 + The rare earth element particles are fully and evenly dispersed in the electrolyte.

5. The preparation method of an intelligent in-situ self-monitoring rare earth-Ni-CrN-based composite coating according to claim 2, wherein In Step 3, the distance between the electrodes is 6 - 10 mm, and the distance between the lower end of the electrode in the electrolyte and the liquid surface is 10 - 15 mm.

Images