CN109487200B - Method for preparing up-conversion development corrosion-resistant coating on magnesium alloy surface by using plasma spraying technology - Google Patents
Method for preparing up-conversion development corrosion-resistant coating on magnesium alloy surface by using plasma spraying technology Download PDFInfo
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Abstract
A method for preparing an up-conversion development corrosion-resistant coating on the surface of a magnesium alloy by utilizing a plasma spraying technology relates to a method for preparing a development corrosion-resistant coating. The invention aims to solve the problem that the application of magnesium alloy as a medical implant material is restricted due to poor bioactivity, corrosion resistance and X-ray development of the existing magnesium alloy. The method comprises the following steps: firstly, preprocessing magnesium alloy; secondly, ultrasonic oil removal; thirdly, preparing a rare earth doped hydroxyapatite powder body; and fourthly, plasma spraying is carried out, and the up-conversion development corrosion-resistant coating is obtained on the surface of the magnesium alloy. The bonding strength of the upconversion development corrosion-resistant coating and the matrix magnesium alloy can reach 35 MPa. The method is suitable for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy.
Description
Technical Field
The invention relates to a method for preparing a developing corrosion-resistant coating.
Background
Biomedical materials, also known as biomaterials, are highly new materials used to diagnose, treat, repair, or replace damaged tissues and organs, or to enhance their functions. With the development of biomedicine and material science, it is expected that biomaterials implanted into the human body serve only as temporary substitutes and gradually degrade and are absorbed by the body as tissues or organs regenerate, so as to minimize the long-term effects of the materials on the body. The biodegradable material has a series of advantages of being easy to decompose in a living body, capable of metabolizing and finally discharging out of the body, free of toxic and side effects on the body and the like, so that the biodegradable material is more and more attracted and favored by scientists. In recent years, the research on a new generation of medical metal materials having biodegradable properties, such as biodegradable magnesium alloys, has been receiving particular attention. The medical material skillfully utilizes the characteristic that magnesium alloy is easy to degrade in human body environment to realize the clinical medical purpose that the metal implant is gradually degraded in vivo until the metal implant disappears. Magnesium is an intracellular cation with a second content to potassium in the human body and plays an important role in the metabolic process, and is also a main component constituting the bone of an organism, and can promote the formation of bones, teeth and cells and play an important regulation role in the mineral metabolism of the bones. In addition, because of the characteristics of the metal material of the magnesium alloy, the plasticity, the rigidity, the processing performance and the like of the magnesium alloy are far superior to those of degradable high polymer materials such as polylactic acid and the like which are clinically applied at present, so the magnesium alloy is more suitable for clinical application in the aspects of repair and interventional therapy of hard tissues such as bones and the like. More particularly, the magnesium alloy selected in the global existing experiment has no adverse effect when short-term experiment observation is carried out in blood and bone environments. The medical function of the existing metal implantation instrument can be greatly improved and a new medical effect can be generated by the medical clinical application of the medical degradable magnesium alloy material, so that new gospel is brought to the majority of patients; in recent years, research and application of magnesium alloy have been rapidly developed, and with the deep research on degradation behavior of magnesium alloy, reasonable control of corrosion rate of magnesium alloy in human body can be completely realized. Therefore, researchers pay more attention to magnesium and magnesium alloys, and hope to develop the magnesium and magnesium alloys into a biodegradable medical implant material by utilizing the characteristic of easy degradation.
However, the research of magnesium alloy as biomedical implant material faces many difficulties, and how to improve the corrosion performance and bioactivity of magnesium alloy becomes a bottleneck restricting the application of magnesium alloy in the field of medical implant materials. Second, X-ray examination, such as X-ray photography, Digital subtraction angiography (DSA, Computed Tomography (CT), etc.), is now mainly used during and during the period of magnesium alloy bioimplantation due to the low transmission resistance of magnesium alloys to X-rays and thermal neutrons, magnesium alloy X-ray imaging is poor and even invisible under X-rays, resulting in the inability of a physician to accurately position a tracking stent by X-rays during magnesium alloy bioimplantation procedures, and when a patient is exposed to X-rays, cell damage, such as a relative increase in lymphocytes, a decrease in the number of leukocytes, a decrease in platelets, etc., occurs due to biological effects, which can have very serious consequences when the damage reaches a critical point, can affect physiological functions, cause chromosomal abnormalities, and cause cancer, the adoption of ordinary light instead of X-ray radiography reduces the radiation damage of X-rays to human bodies, thus forcing people to continuously strive to find a more appropriate image detection method, thereby benefiting mankind.
Disclosure of Invention
The invention aims to solve the problems that the prior magnesium alloy has poor bioactivity, corrosion resistance and X-ray development and restricts the application of the magnesium alloy as a medical implant material, and provides a method for preparing an up-conversion development corrosion-resistant coating on the surface of the magnesium alloy by using a plasma spraying technology.
A method for preparing an up-conversion development corrosion-resistant coating on the surface of a magnesium alloy by utilizing a plasma spraying technology is completed according to the following steps:
firstly, magnesium alloy pretreatment:
firstly, grinding the magnesium alloy by using 180# SiC sand paper, 600# SiC sand paper, 1000# SiC sand paper and 2000# SiC sand paper in sequence to obtain the magnesium alloy with a bright surface;
secondly, carrying out sand blasting treatment on the surface of the magnesium alloy with a bright surface by using a dry sand blasting machine to obtain the magnesium alloy with a rough surface;
secondly, ultrasonic oil removal: immersing the magnesium alloy with the rough surface into acetone, and performing ultrasonic treatment for 10-30 min under the ultrasonic power of 800-1200W to obtain the magnesium alloy after ultrasonic treatment; washing the magnesium alloy subjected to ultrasonic treatment for 3-5 times by using distilled water, and drying by using a hair drier to obtain deoiled magnesium alloy;
thirdly, preparing the rare earth doped hydroxyapatite powder: mixing hydroxyapatite powder, erbium oxide and ytterbium oxide to obtain mixed powder; ball-milling the mixed powder in a ball mill for 8-10 h to obtain ball-milled mixed powder; sintering the mixed powder after ball milling for 3 to 10 hours in a high-temperature furnace at the temperature of 750 to 850 ℃ to obtain a sintered product; grinding the sintered product in a mortar, and screening through a No. 240 screen and a No. 325 screen respectively to obtain rare earth doped hydroxyapatite powder with the particle size of 45-61 microns;
the molar ratio of erbium oxide to ytterbium oxide in the third step is 1 (5-10);
the mass ratio of the hydroxyapatite to the erbium oxide in the third step is (100-200) to (0.38-0.95);
fourthly, spraying the rare earth doped hydroxyapatite powder with the particle size of 45-61 mu m on the surface of the deoiled magnesium alloy by SX-80 plasma spraying equipment to obtain the up-conversion developing corrosion-resistant coating on the surface of the magnesium alloy.
The invention has the advantages that:
firstly, the upconversion development corrosion-resistant coating is prepared on the surface of the magnesium alloy by utilizing a plasma spraying technology, and the bonding strength of the upconversion development corrosion-resistant coating and the matrix magnesium alloy can reach 35 MPa;
secondly, the matrix magnesium alloy and the up-conversion development corrosion-resistant coating obtained on the surface of the magnesium alloy by the method of the invention are tested in 3.5 wt.% NaCl solution for corrosion performance, and the corrosion current density of the matrix magnesium alloy is 1.05 × 10-4A/cm2The corrosion current density of the upconversion development corrosion-resistant coating obtained on the surface of the magnesium alloy by the method is 30-45 times that of the upconversion development corrosion-resistant coating;
thirdly, a 980nm laser is utilized to carry out up-conversion fluorescence spectrum test on the up-conversion development corrosion-resistant coating obtained by the invention, and the materials emit light at 530nm, 550nm and 660nm respectively, so that the output of up-conversion fluorescence is realized;
the upconversion development corrosion-resistant coating is prepared on the surface of the magnesium alloy, and the obtained upconversion development corrosion-resistant coating has great application value in the aspect of implanting materials, so that the problem of corrosion of the magnesium alloy is solved, the bioactivity of the surface of the magnesium alloy is improved, and the controllable degradation of the materials is realized; the most important thing is that the up-conversion fluorescence is compounded with rare earth ions to realize the output of the up-conversion fluorescence, the whole position and the surface state of the implanted material can be sensitively controlled and tracked during the implantation operation, and the related evaluation is simply and directly carried out on the surface state of the implanted material, so that a developing agent and a developing ring can be completely replaced, the residue of the developing point or the developing ring in a human body is avoided, the occurrence of thrombus is avoided, and secondly, the up-conversion fluorescence replaces the conventional X-ray radiography technology, the radiation damage of X-rays to the human body can be effectively avoided, and the occurrence of potential diseases is reduced; the upconversion fluorescence development technology is used as a novel image detection means and will bring an epoch-making revolution for the medical field.
The method is suitable for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy.
Drawings
FIG. 1 is an XRD pattern of an upconverted developed corrosion resistant coating obtained on a surface of a magnesium alloy in a first example;
FIG. 2 is the fluorescence spectrum of the upconversion developed corrosion resistant coating obtained on the surface of the magnesium alloy in the first example.
FIG. 3 is a corrosion resistance test chart of the magnesium alloy of the substrate and the upconversion development corrosion-resistant coating obtained on the surface of the magnesium alloy in the first embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is a method for preparing an up-conversion development corrosion-resistant coating on the surface of a magnesium alloy by using a plasma spraying technology, which is completed by the following steps:
firstly, magnesium alloy pretreatment:
firstly, grinding the magnesium alloy by using 180# SiC sand paper, 600# SiC sand paper, 1000# SiC sand paper and 2000# SiC sand paper in sequence to obtain the magnesium alloy with a bright surface;
secondly, carrying out sand blasting treatment on the surface of the magnesium alloy with a bright surface by using a dry sand blasting machine to obtain the magnesium alloy with a rough surface;
secondly, ultrasonic oil removal: immersing the magnesium alloy with the rough surface into acetone, and performing ultrasonic treatment for 10-30 min under the ultrasonic power of 800-1200W to obtain the magnesium alloy after ultrasonic treatment; washing the magnesium alloy subjected to ultrasonic treatment for 3-5 times by using distilled water, and drying by using a hair drier to obtain deoiled magnesium alloy;
thirdly, preparing the rare earth doped hydroxyapatite powder: mixing hydroxyapatite powder, erbium oxide and ytterbium oxide to obtain mixed powder; ball-milling the mixed powder in a ball mill for 8-10 h to obtain ball-milled mixed powder; sintering the mixed powder after ball milling for 3 to 10 hours in a high-temperature furnace at the temperature of 750 to 850 ℃ to obtain a sintered product; grinding the sintered product in a mortar, and screening through a No. 240 screen and a No. 325 screen respectively to obtain rare earth doped hydroxyapatite powder with the particle size of 45-61 microns;
the molar ratio of erbium oxide to ytterbium oxide in the third step is 1 (5-10);
the mass ratio of the hydroxyapatite to the erbium oxide in the third step is (100-200) to (0.38-0.95);
fourthly, spraying the rare earth doped hydroxyapatite powder with the particle size of 45-61 mu m on the surface of the deoiled magnesium alloy by SX-80 plasma spraying equipment to obtain the up-conversion developing corrosion-resistant coating on the surface of the magnesium alloy.
The advantages of this embodiment:
firstly, the upconversion development corrosion-resistant coating is prepared on the surface of the magnesium alloy by utilizing a plasma spraying technology, and the bonding strength of the upconversion development corrosion-resistant coating and the matrix magnesium alloy can reach 35 MPa;
secondly, the corrosion performance of the matrix magnesium alloy and the up-conversion development corrosion-resistant coating obtained on the surface of the magnesium alloy by the method of the embodiment are tested in 3.5 wt.% NaCl solution, and the corrosion current density of the matrix magnesium alloy is 1.05 × 10-4A/cm2The corrosion current density of the upconversion development corrosion-resistant coating obtained on the surface of the magnesium alloy by the method is 30-45 times that of the upconversion development corrosion-resistant coating;
thirdly, a 980nm laser is used for carrying out up-conversion fluorescence spectrum test on the up-conversion development corrosion-resistant coating obtained by the embodiment, and the materials emit light at 530nm, 550nm and 660nm respectively, so that the output of up-conversion fluorescence is realized;
the upconversion development corrosion-resistant coating is prepared on the surface of the magnesium alloy, and the obtained upconversion development corrosion-resistant coating has great application value in the aspect of implanting materials, so that the problem of corrosion of the magnesium alloy is solved, the bioactivity of the surface of the magnesium alloy is improved, and the controllable degradation of the materials is realized; the most important thing is that the up-conversion fluorescence is compounded with rare earth ions to realize the output of the up-conversion fluorescence, the whole position and the surface state of the implanted material can be sensitively controlled and tracked during the implantation operation, and the related evaluation is simply and directly carried out on the surface state of the implanted material, so that a developing agent and a developing ring can be completely replaced, the residue of the developing point or the developing ring in a human body is avoided, the occurrence of thrombus is avoided, and secondly, the up-conversion fluorescence replaces the conventional X-ray radiography technology, the radiation damage of X-rays to the human body can be effectively avoided, and the occurrence of potential diseases is reduced; the upconversion fluorescence development technology is used as a novel image detection means and will bring an epoch-making revolution for the medical field.
The embodiment is suitable for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the sand grains selected in the sand blasting treatment in the first step are 280# white corundum sand, the sand blasting pressure is 0.2MPa, the sand blasting distance is 100 cm-120 cm, and the sand blasting time is 0.5 min-1 min. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the ball-milling in the third step has a ball-material ratio of (3-6) to 1, a ball-milling speed of 250-400 r/min and a ball-milling time of 300-420 min. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: mixing hydroxyapatite powder, erbium oxide and ytterbium oxide to obtain mixed powder; ball-milling the mixed powder in a ball mill for 9-10 h to obtain ball-milled mixed powder; sintering the mixed powder after ball milling for 4 to 6 hours in a high-temperature furnace at the temperature of 750 to 800 ℃ to obtain a sintered product; and grinding the sintered product in a mortar, and screening by a No. 240 screen and a No. 325 screen respectively to obtain the rare earth doped hydroxyapatite powder with the particle size of 45-61 microns. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the particle size of the hydroxyapatite in the third step is 30-120 μm. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: the molar ratio of erbium oxide to ytterbium oxide in the third step is 1 (8-10). The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the mass ratio of the hydroxyapatite to the erbium oxide in the third step is (150-200): 0.8-0.95. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the SX-80 plasma spraying equipment in the fourth step has the power of 30kW to 40kW when spraying, the spraying distance of 100mm to 200mm, the powder feeding speed of 20g/min to 50g/min, and the working gas is the mixed gas of argon and hydrogen, wherein the volume ratio of the argon to the hydrogen is 4: 1. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the SX-80 plasma spraying equipment in the fourth step has the power of 30kW to 35kW when spraying, the spraying distance of 100mm to 110mm, the powder feeding speed of 25g/min to 28g/min, and the working gas is the mixed gas of argon and hydrogen, wherein the volume ratio of the argon to the hydrogen is 4: 1. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: the thickness of the up-conversion development corrosion-resistant coating in the fourth step is 100-150 μm. The other steps are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows: a method for preparing an up-conversion development corrosion-resistant coating on the surface of a magnesium alloy by utilizing a plasma spraying technology is completed according to the following steps:
firstly, magnesium alloy pretreatment:
firstly, grinding the magnesium alloy by using 180# SiC sand paper, 600# SiC sand paper, 1000# SiC sand paper and 2000# SiC sand paper in sequence to obtain the magnesium alloy with a bright surface;
the magnesium alloy in the first step is ZK 60;
secondly, carrying out sand blasting treatment on the surface of the magnesium alloy with a bright surface by using a dry sand blasting machine to obtain the magnesium alloy with a rough surface;
the sand grains selected by the sand blasting treatment in the first step are 280# white corundum sand, the sand blasting pressure is 0.2MPa, the sand blasting distance is 100cm, and the sand blasting time is 1 min;
secondly, ultrasonic oil removal: immersing the magnesium alloy with the rough surface into acetone, and performing ultrasonic treatment for 15min under the ultrasonic power of 800W to obtain the magnesium alloy after ultrasonic treatment; washing the magnesium alloy subjected to ultrasonic treatment for 4 times by using distilled water, and drying by using a hair drier to obtain the deoiled magnesium alloy;
thirdly, preparing the rare earth doped hydroxyapatite powder: mixing hydroxyapatite powder, erbium oxide and ytterbium oxide to obtain mixed powder; ball-milling the mixed powder in a ball mill for 10 hours to obtain ball-milled mixed powder; sintering the mixed powder after ball milling in a high-temperature furnace at 800 ℃ for 4h to obtain a sintered product; grinding the sintered product in a mortar, and screening through a No. 240 screen and a No. 325 screen respectively to obtain rare earth doped hydroxyapatite powder with the particle size of 45-61 microns;
the molar ratio of erbium oxide to ytterbium oxide in the third step is 1: 10;
the mass ratio of the hydroxyapatite to the erbium oxide in the step three is 100: 0.95;
the ball-milling in the third step has a ball-material ratio of 3:1, a ball-milling speed of 350r/min and a ball-milling time of 360 min;
the particle size of the hydroxyapatite in the third step is 40-120 μm;
fourthly, spraying the rare earth doped hydroxyapatite powder with the particle size of 45-61 mu m on the surface of the deoiled magnesium alloy by SX-80 plasma spraying equipment to obtain an up-conversion development corrosion-resistant coating on the surface of the magnesium alloy;
the SX-80 plasma spraying equipment in the fourth step has the power of 35kW during spraying, the spraying distance of 110mm, the powder feeding speed of 28g/min and the working gas of the mixed gas of argon and hydrogen, wherein the volume ratio of argon to hydrogen is 4: 1;
the thickness of the upconversion developed corrosion resistant coating in step four is 100 μm.
FIG. 1 is an XRD pattern of an upconverted developed corrosion resistant coating obtained on a surface of a magnesium alloy in a first example;
as can be seen from fig. 1, in the first example, the hydroxyapatite coating is successfully prepared by using the plasma spraying technology, the rare earth doping does not generate a hetero-phase, and rare earth ions may exist in the form of gaps or occupied spaces inside the crystal lattice.
FIG. 2 is the fluorescence spectrum of the upconversion developed corrosion resistant coating obtained on the surface of the magnesium alloy in the first example.
As can be seen from FIG. 2, the up-conversion green light output is provided near 525nm and 550nm, and the up-conversion red light output is provided near 660nm and 680nm, which indicates that the rare earth doped hydroxyapatite coating prepared by plasma spraying can convert near infrared light into visible light, and lays a foundation for the development of the magnesium alloy implant material.
The bonding strength of the upconversion development corrosion-resistant coating and the matrix magnesium alloy prepared in the first embodiment can reach 35 MPa.
FIG. 3 is a corrosion resistance test chart of the magnesium alloy of the substrate and the upconversion development corrosion-resistant coating obtained on the surface of the magnesium alloy in the first embodiment.
Testing the upconversion development resistance obtained on the surface of a magnesium alloy by the method of example oneCorrosion resistance of the corrosion coating in 3.5 wt.% NaCl solution with a corrosion current density of 2.62 × 10-6A/cm2Corrosion resistance of matrix magnesium alloy (ZK60 matrix) in 3.5 wt.% NaCl solution with a corrosion current density of 1.05 × 10-4A/cm2The corrosion resistance of the upconversion development corrosion-resistant coating obtained on the surface of the magnesium alloy by the method of the first embodiment is 40.07 times that of the magnesium alloy as the matrix.
Claims (7)
1. A method for preparing an up-conversion development corrosion-resistant coating on the surface of a magnesium alloy by using a plasma spraying technology is characterized in that the method for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy by using the plasma spraying technology is completed according to the following steps:
firstly, magnesium alloy pretreatment:
firstly, grinding the magnesium alloy by using 180# SiC sand paper, 600# SiC sand paper, 1000# SiC sand paper and 2000# SiC sand paper in sequence to obtain the magnesium alloy with a bright surface;
secondly, carrying out sand blasting treatment on the surface of the magnesium alloy with a bright surface by using a dry sand blasting machine to obtain the magnesium alloy with a rough surface;
secondly, ultrasonic oil removal: immersing the magnesium alloy with the rough surface into acetone, and performing ultrasonic treatment for 10-30 min under the ultrasonic power of 800-1200W to obtain the magnesium alloy after ultrasonic treatment; washing the magnesium alloy subjected to ultrasonic treatment for 3-5 times by using distilled water, and drying by using a hair drier to obtain deoiled magnesium alloy;
thirdly, preparing the rare earth doped hydroxyapatite powder: mixing hydroxyapatite powder, erbium oxide and ytterbium oxide to obtain mixed powder; ball-milling the mixed powder in a ball mill for 8-10 h to obtain ball-milled mixed powder; sintering the mixed powder after ball milling for 3 to 10 hours in a high-temperature furnace at the temperature of 750 to 850 ℃ to obtain a sintered product; grinding the sintered product in a mortar, and screening through a No. 240 screen and a No. 325 screen respectively to obtain rare earth doped hydroxyapatite powder with the particle size of 45-61 microns;
the particle size of the hydroxyapatite in the third step is 30-120 μm;
the molar ratio of erbium oxide to ytterbium oxide in the third step is 1 (5-10);
the mass ratio of the hydroxyapatite to the erbium oxide in the third step is (100-200) to (0.38-0.95);
fourthly, spraying the rare earth doped hydroxyapatite powder with the particle size of 45-61 mu m on the surface of the deoiled magnesium alloy by SX-80 plasma spraying equipment to obtain an up-conversion development corrosion-resistant coating on the surface of the magnesium alloy;
the SX-80 plasma spraying equipment in the fourth step has the power of 30kW to 40kW when spraying, the spraying distance of 100mm to 200mm, the powder feeding speed of 20g/min to 50g/min, and the working gas is the mixed gas of argon and hydrogen, wherein the volume ratio of the argon to the hydrogen is 4: 1;
the thickness of the up-conversion development corrosion-resistant coating in the fourth step is 100-150 μm.
2. The method for preparing the up-conversion developing corrosion resistant coating on the magnesium alloy surface by using the plasma spraying technology as claimed in claim 1, wherein the sand grains selected by the sand blasting treatment in the first step are 280# white corundum sand, the sand blasting pressure is 0.2MPa, the sand blasting distance is 100 cm-120 cm, and the sand blasting time is 0.5 min-1 min.
3. The method for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy by using the plasma spraying technology as claimed in claim 1, wherein the ball-milling in the third step has a ball-material ratio of (3-6): 1, a ball-milling speed of 250-400 r/min and a ball-milling time of 300-420 min.
4. The method for preparing the up-conversion development corrosion-resistant coating on the surface of the magnesium alloy by using the plasma spraying technology according to claim 1, which is characterized in that hydroxyapatite powder, erbium oxide and ytterbium oxide are mixed in the third step to obtain mixed powder; ball-milling the mixed powder in a ball mill for 9-10 h to obtain ball-milled mixed powder; sintering the mixed powder after ball milling for 4 to 6 hours in a high-temperature furnace at the temperature of 750 to 800 ℃ to obtain a sintered product; and grinding the sintered product in a mortar, and screening by a No. 240 screen and a No. 325 screen respectively to obtain the rare earth doped hydroxyapatite powder with the particle size of 45-61 microns.
5. The method for preparing the up-conversion developing corrosion-resistant coating on the surface of the magnesium alloy by using the plasma spraying technology as claimed in claim 1, wherein the molar ratio of erbium oxide to ytterbium oxide in the third step is 1 (8-10).
6. The method for preparing an upconversion developing corrosion-resistant coating on a magnesium alloy surface by using a plasma spraying technology as claimed in claim 1, wherein the mass ratio of the hydroxyapatite to the erbium oxide in the third step is (150-200): 0.8-0.95).
7. The method for preparing the up-conversion developing corrosion-resistant coating on the surface of the magnesium alloy by using the plasma spraying technology as claimed in claim 1, wherein the SX-80 plasma spraying equipment in the fourth step has the power of 30kW to 35kW when spraying, the spraying distance of 100mm to 110mm, the powder feeding speed of 25g/min to 28g/min, and the working gas is the mixed gas of argon and hydrogen, wherein the volume ratio of the argon to the hydrogen is 4: 1.
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