Wear-resistant and corrosion-resistant aluminum bronze for bearing and preparation process thereof

Abstract

The invention relates to the technical field of aluminum bronze, and discloses wear-resistant and corrosion-resistant aluminum bronze for a bearing and a preparation process of the wear-resistant and corrosion-resistant aluminum bronze. The preparation process comprises the following steps: S1, cutting an as-cast aluminum bronze alloy into an appropriate size, and sequentially carrying out surface pretreatment, surface blackening treatment and laser surface quenching on the surface of the as-cast aluminum bronze alloy to prepare a base layer aluminum bronze alloy; s2, the base layer aluminum bronze alloy is sequentially subjected to surface pretreatment and arc ion plating deposition, and a working layer aluminum bronze alloy is prepared; and S3, after laser etching and plasma activation are conducted on the surface of the working layer aluminum bronze alloy, the working layer aluminum bronze alloy is immersed in an organic / inorganic composite solution, vortexing is conducted for 10-15 min, room-temperature ultrasonic treatment is conducted for 15-20 min, then the working layer aluminum bronze alloy is placed at the room temperature for 15-20 min, the working layer aluminum bronze alloy is placed in the environment of 120-125 DEG C to be cured and subjected to ultrasonic cleaning, and the wear-resisting and corrosion-resisting aluminum bronze for the bearing

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum bronze, in particular to a wear-resistant and corrosion-resistant aluminum bronze for bearings and a preparation process thereof. Background Art

[0002] Aluminum bronze, as an important engineering material, is widely used in the field of bearing manufacturing. However, in actual operation, bearings are often in high-load, high-friction and corrosive media environments, which place extremely high demands on the material's wear resistance and corrosion resistance. Existing aluminum bronze materials are prone to surface wear and corrosion under complex working conditions, leading to bearing failure and affecting the stability and service life of the equipment. Although traditional surface treatment technologies such as quenching and plating can improve the surface properties of aluminum bronze to a certain extent, there are problems such as insufficient bonding between the coating and the substrate, poor density of the corrosion-resistant layer, and difficulty in maintaining the wear-resistant effect in the long term. It is difficult to meet the stringent requirements of high-end bearings for wear resistance and corrosion resistance.

[0003] Therefore, developing a preparation process that can significantly improve the wear resistance and corrosion resistance of aluminum bronze is of great practical significance for improving the reliability and service life of bearings. Summary of the Invention

[0004] The object of the present invention is to provide a wear-resistant and corrosion-resistant aluminum bronze for bearings and a preparation process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: S1: cutting a cast aluminum bronze alloy into suitable sizes, and sequentially performing surface pretreatment, surface blackening treatment, and laser surface quenching on the surface to prepare a base layer aluminum bronze alloy; S2: performing surface pretreatment and arc ion plating deposition on the base layer aluminum bronze alloy in sequence to prepare a working layer aluminum bronze alloy; S3: After laser etching and plasma activation of the surface of the working layer aluminum bronze alloy, immersing it in an organic / inorganic composite solution, vortexing it for 10-15 minutes, ultrasonicating it at room temperature for 15-20 minutes, leaving it at room temperature for 15-20 minutes, curing it in an environment of 120-125°C, and ultrasonically cleaning it to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings; Furthermore, in the preparation process of the base layer aluminum bronze alloy, the surface pretreatment specifically includes: polishing the surface of the cast aluminum bronze alloy with sandpaper; the surface blackening treatment specifically includes: immersing the cast aluminum bronze alloy and the graphite sheet in an oxidizing solution composed of 100g / L NaOH, 2g / L H8MoN2O4 and 50g / L K2Cr2O7, connecting a DC power supply, and adjusting the current density to 5A / dm 2, oxidation for 10-15 minutes; the specific steps of the laser surface quenching include: using a high-power semiconductor laser with a power of 1400W to perform laser surface quenching on the cast aluminum bronze alloy, the laser surface quenching matrix spot is 17mm×1.5mm, the spot movement rate is 7-8mm / s, and parallel laser tracks and 50% overlap are used to achieve complete coverage of the aluminum bronze alloy surface.

[0006] Furthermore, the surface of the base layer aluminum bronze alloy is a supersaturated solid solution base layer prepared by laser surface quenching, and its thickness is 30-50 μm.

[0007] Furthermore, in the preparation process of the working layer aluminum bronze alloy, the specific steps of the surface pretreatment include: Ar⁺ plasma activation of the working layer aluminum bronze alloy surface, the power is 200-220W, and the time is 30-45min; the specific steps of the arc ion plating deposition include: setting the working layer deposition temperature at 400-405°C, the working pressure is 3.5Pa, and the base bias is -60V, and preparing the working layer on the surface of the base layer aluminum bronze alloy; the working layer preparation includes the preparation of the initial layer, the transition layer, and the surface layer.

[0008] Furthermore, the initial layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 600sccm, an oxygen flow rate of 0sccm, a thickness of 1±0.1μm, and a modulation period of 12.3-12.4m; the transition layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 550-570sccm, an oxygen flow rate of 25-30sccm, a thickness of 1±0.1μm, and a modulation period of 10-10.1nm; the surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300sccm, an oxygen flow rate of 30sccm, a thickness of 1±0.1μm, and a modulation period of 7.1-7.2nm.

[0009] Furthermore, in the preparation process of the wear-resistant and corrosion-resistant aluminum bronze for the bearing, the laser etching parameters include: nitrogen atmosphere protection, energy density 1.2-1.5 J / cm 2 , scanning speed 600-800 mm / s, pulse width 5-8 ns, focal spot diameter 50-80 μm, surface roughness 0.8-1.2 μm; the plasma activation parameters include: Ar⁺ plasma treatment, power 100-120 W, time 5-6 min.

[0010] Furthermore, the preparation method of the organic / inorganic composite solution comprises the following steps: step (1): adding diethylenetriamine and heptafluorobutyric acid to acetone, heating to 80-85°C and stirring for 20-30 minutes, adding epoxy resin, cooling to 40-45°C and reacting for 60-75 minutes to obtain fluorinated epoxy resin; step (2): adding 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and nano-silica to anhydrous ethanol, heating to 40-45°C, pH 5-5.1, stirring for 2-3 hours, adding fluorinated epoxy resin, KH550, and dispersant, heating to 45-46°C and stirring for 1.5-2 hours to obtain an organic / inorganic composite solution.

[0011] Furthermore, in the preparation process of the fluorinated epoxy resin, the mass ratio of diethylenetriamine: heptafluorobutyric acid: epoxy resin is 2:8:(8-10); in the preparation process of the organic / inorganic composite solution, the mass ratio of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane: nano-silica: fluorinated epoxy resin: KH550: dispersant is (1.2-1.5):(4-5):(0.9-1):(0.46-0.5):(0.01-0.012).

[0012] Furthermore, the dispersant is Disperbyk-2012.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention produces an aluminum bronze alloy for bearings with excellent corrosion and wear resistance through laser surface quenching, arc ion plating gradient AlCrON coating, and epoxy resin filler film curing. The high temperature of laser quenching dissolves the original coarse α and κ phases, while rapid cooling suppresses the formation of precipitated phases, forming a uniform β solid solution. Rapid heating and cooling refine the aluminum bronze alloy's grains, forming a supersaturated solid solution layer. This process eliminates element segregation (such as the aggregation of Al and Ni), reduces interphase galvanic corrosion (such as differential corrosion between β' and κ phases), and improves the hardness and density of the substrate. The uniform solid solution produced by laser surface quenching serves as a "transition interface," leveraging its in-situ metallurgical bonding to the substrate, which is typically stronger than physical vapor deposition (PVD) bonding. This enhances the adhesion of subsequent coatings to the substrate and reduces the risk of coating spalling.

[0014] The nano-multilayer structure of the AlCrON coating is achieved through gradient preparation, improving corrosion resistance through grain refinement and interfacial barrier effects (such as the nitrogen-enriched layer inhibiting Cl⁻ diffusion). Finally, a micro-skeleton-nanofiller composite membrane, prepared by curing a fluorinated epoxy resin and hydrophobically modified silica, is laser-etched to form micron-scale pores on the AlCrON surface, serving as anchor points for the micro-skeleton-nanofiller composite membrane and forming a physical and mechanical interlocking structure. Plasma activation pretreatment further strengthens the bonding between the layers, creating a micro-skeleton-nanofiller composite membrane on the AlCrON coating surface, providing superhydrophobicity and mechanical wear resistance, and further blocking moisture and corrosive ions. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0016] Example 1: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: The preparation method of an organic / inorganic composite solution comprises the following steps: step (1): adding 2 g of diethylenetriamine and 8 g of heptafluorobutyric acid to acetone, heating to 80° C. and stirring for 20 min, adding 8 g of epoxy resin, cooling to 40° C. and reacting for 60 min, and obtaining a fluorinated epoxy resin; step (2): adding 1.2 g of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and 4 g of nano-silica to anhydrous ethanol, heating to 40° C., pH 5, stirring for 2 h, adding 0.9 g of fluorinated epoxy resin, 0.46 g of KH550, and 0.01 g of a dispersant Disperbyk–2012, heating to 45° C. and stirring for 1.5 h, and obtaining an organic / inorganic composite solution; S1: Cut the cast aluminum bronze alloy into appropriate sizes and polish the surface of the cast aluminum bronze alloy with sandpaper. Immerse the cast aluminum bronze alloy and graphite sheet in an oxidizing solution consisting of 100 g / L NaOH, 2 g / L H8MoN2O4, and 50 g / L K2Cr2O7. Connect a DC power supply for surface blackening treatment and adjust the current density to 5 A / dm 2 , oxidation for 10 minutes, laser surface quenching of the as-cast aluminum bronze alloy was performed using a high-power semiconductor laser with a power of 1400W. The laser surface quenching matrix spot was 17mm×1.5mm, and the spot moving rate was 7mm / s. Parallel laser tracks and 50% overlap were used to achieve complete coverage of the aluminum bronze alloy surface for laser surface quenching, and a base layer aluminum bronze alloy was prepared; The thickness of the supersaturated solid solution base layer prepared by laser surface quenching on the surface of the base layer aluminum bronze alloy is 30 μm; S2: The surface of the base layer aluminum bronze alloy was activated by Ar⁺ plasma with a power of 200 W for 30 min. The working layer deposition temperature was set at 400°C, the working pressure was 3.5 Pa, and the base bias was -60 V. The working layer was prepared on the surface of the base layer aluminum bronze alloy by arc ion plating to obtain a working layer aluminum bronze alloy. Among them, the working layer preparation includes the preparation of the initial layer, transition layer and surface layer; The initial layer preparation parameters include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 600 sccm, an oxygen flow rate of 0 sccm, a thickness of 1 μm, and a modulation period of 12.3 m; The parameters for preparing the transition layer include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 570 sccm, an oxygen flow rate of 25 sccm, a thickness of 1 μm, and a modulation period of 10 nm; The surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1 μm, and a modulation period of 7.1 nm; S3: Laser etching the aluminum bronze alloy surface of the working layer under nitrogen atmosphere with an energy density of 1.2 J / cm 2 , scanning speed 600mm / s, pulse width 6ns, focal spot diameter 60μm, surface roughness 1.0μm, then use Ar⁺ plasma activation with a power of 100W for 5min, then immerse in an organic / inorganic composite solution, vortex for 10min, ultrasonicate at room temperature for 15min, then place at room temperature for 15min, place in a 120℃ environment for curing, and ultrasonically clean to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings.

[0017] Example 2: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: The method for preparing an organic / inorganic composite solution comprises the following steps: step (1): adding 2 g of diethylenetriamine and 1 g of heptafluorobutyric acid to acetone, heating the mixture to 80° C. and stirring for 20 min, adding 10 g of epoxy resin, cooling the mixture to 40° C. and reacting the mixture for 60 min, and obtaining a fluorinated epoxy resin; step (2): adding 1.4 g of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and 5 g of nano-silicon dioxide to anhydrous ethanol, heating the mixture to 40° C. and pH 5, and stirring the mixture for 2 h, adding 1 g of fluorinated epoxy resin, 0.5 g of KH550, and 0.012 g of a dispersant Disperbyk-2012, heating the mixture to 45° C. and stirring the mixture for 1.5 h, and obtaining an organic / inorganic composite solution; S1: Cut the cast aluminum bronze alloy into appropriate sizes and polish the surface of the cast aluminum bronze alloy with sandpaper. Immerse the cast aluminum bronze alloy and graphite sheet in an oxidizing solution consisting of 100 g / L NaOH, 2 g / L H8MoN2O4, and 50 g / L K2Cr2O7. Connect a DC power supply for surface blackening treatment and adjust the current density to 5 A / dm 2 , oxidation for 10 minutes, laser surface quenching of the as-cast aluminum bronze alloy was performed using a high-power semiconductor laser with a power of 1400W. The laser surface quenching matrix spot was 17mm×1.5mm, and the spot moving rate was 7mm / s. Parallel laser tracks and 50% overlap were used to achieve complete coverage of the aluminum bronze alloy surface for laser surface quenching, and a base layer aluminum bronze alloy was prepared; The thickness of the supersaturated solid solution base layer prepared by laser surface quenching on the surface of the base layer aluminum bronze alloy is 50 μm; S2: The surface of the base layer aluminum bronze alloy was activated by Ar⁺ plasma with a power of 200 W for 30 min. The working layer deposition temperature was set at 400°C, the working pressure was 3.5 Pa, and the base bias was -60 V. The working layer was prepared on the surface of the base layer aluminum bronze alloy by arc ion plating to obtain a working layer aluminum bronze alloy. Among them, the working layer preparation includes the preparation of the initial layer, transition layer and surface layer; The initial layer preparation parameters include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 600 sccm, an oxygen flow rate of 0 sccm, a thickness of 1 μm, and a modulation period of 12.3 m; The transition layer preparation parameters include: using revolution and rotation mode, setting an AlCr target, nitrogen flow rate of 550 sccm, oxygen flow rate of 30 sccm, thickness of 1 μm, and modulation period of 10 nm; The surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1 μm, and a modulation period of 7.1 nm; S3: The surface of the aluminum bronze alloy of the working layer is laser etched under nitrogen atmosphere with an energy density of 1.5 J / cm 2 , scanning speed 600mm / s, pulse width 7ns, focal spot diameter 55μm, surface roughness 1.0μm, then use Ar⁺ plasma activation with a power of 100W for 5min, then immerse in an organic / inorganic composite solution, vortex for 10min, ultrasonicate at room temperature for 15min, then place at room temperature for 15min, place in a 120℃ environment for curing, and ultrasonically clean to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings.

[0018] Comparative Example 1: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: The preparation method of an organic / inorganic composite solution comprises the following steps: step (1): adding 2 g of diethylenetriamine and 8 g of heptafluorobutyric acid to acetone, heating to 80° C. and stirring for 20 min, adding 8 g of epoxy resin, cooling to 40° C. and reacting for 60 min, and obtaining a fluorinated epoxy resin; step (2): adding 1.2 g of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and 4 g of nano-silica to anhydrous ethanol, heating to 40° C., pH 5, stirring for 2 h, adding 0.9 g of fluorinated epoxy resin, 0.46 g of KH550, and 0.01 g of a dispersant Disperbyk–2012, heating to 45° C. and stirring for 1.5 h, and obtaining an organic / inorganic composite solution; S1: The surface of the aluminum bronze alloy was activated by Ar⁺ plasma with a power of 200 W for 30 min. The working layer deposition temperature was set at 400°C, the working pressure was 3.5 Pa, and the base bias was -60 V. The working layer was prepared on the surface of the base layer aluminum bronze alloy by arc ion plating to obtain a working layer aluminum bronze alloy. Among them, the working layer preparation includes the preparation of the initial layer, transition layer and surface layer; The initial layer preparation parameters include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 600 sccm, an oxygen flow rate of 0 sccm, a thickness of 1 μm, and a modulation period of 12.3 m; The parameters for preparing the transition layer include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 570 sccm, an oxygen flow rate of 25 sccm, a thickness of 1 μm, and a modulation period of 10 nm; The surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1 μm, and a modulation period of 7.1 nm; S2: The surface of the aluminum bronze alloy in the working layer is laser etched under nitrogen atmosphere with an energy density of 1.2 J / cm 2 , scanning speed 600mm / s, pulse width 6ns, focal spot diameter 60μm, surface roughness 1.0μm, then use Ar⁺ plasma activation with a power of 100W for 5min, then immerse in an organic / inorganic composite solution, vortex for 10min, ultrasonicate at room temperature for 15min, then place at room temperature for 15min, place in a 120℃ environment for curing, and ultrasonically clean to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings.

[0019] Comparative Example 2: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: The preparation method of an organic / inorganic composite solution comprises the following steps: step (1): adding 2 g of diethylenetriamine and 8 g of heptafluorobutyric acid to acetone, heating to 80° C. and stirring for 20 min, adding 8 g of epoxy resin, cooling to 40° C. and reacting for 60 min, and obtaining a fluorinated epoxy resin; step (2): adding 1.2 g of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and 4 g of nano-silica to anhydrous ethanol, heating to 40° C., pH 5, stirring for 2 h, adding 0.9 g of fluorinated epoxy resin, 0.46 g of KH550, and 0.01 g of a dispersant Disperbyk–2012, heating to 45° C. and stirring for 1.5 h, and obtaining an organic / inorganic composite solution; S1: Cut the cast aluminum bronze alloy into appropriate sizes and polish the surface of the cast aluminum bronze alloy with sandpaper. Immerse the cast aluminum bronze alloy and graphite sheet in an oxidizing solution consisting of 100 g / L NaOH, 2 g / L H8MoN2O4, and 50 g / L K2Cr2O7. Connect a DC power supply for surface blackening treatment and adjust the current density to 5 A / dm 2 , oxidation for 10 minutes, laser surface quenching of the as-cast aluminum bronze alloy was performed using a high-power semiconductor laser with a power of 1400W. The laser surface quenching matrix spot was 17mm×1.5mm, and the spot moving rate was 7mm / s. Parallel laser tracks and 50% overlap were used to achieve complete coverage of the aluminum bronze alloy surface for laser surface quenching, and a base layer aluminum bronze alloy was prepared; The thickness of the supersaturated solid solution base layer prepared by laser surface quenching on the surface of the base layer aluminum bronze alloy is 30 μm; S2: The surface of the base layer aluminum bronze alloy was activated by Ar⁺ plasma with a power of 200 W for 30 min. The working layer deposition temperature was set at 400°C, the working pressure was 3.5 Pa, and the base bias was -60 V. The working layer was prepared on the surface of the base layer aluminum bronze alloy by arc ion plating to obtain a working layer aluminum bronze alloy. Wherein, the working layer preparation includes the preparation of the surface layer; The surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1 μm, and a modulation period of 7.1 nm; S3: Laser etching the aluminum bronze alloy surface of the working layer under nitrogen atmosphere with an energy density of 1.2 J / cm 2, scanning speed 600mm / s, pulse width 6ns, focal spot diameter 60μm, surface roughness 1.0μm, then use Ar⁺ plasma activation with a power of 100W for 5min, then immerse in an organic / inorganic composite solution, vortex for 10min, ultrasonicate at room temperature for 15min, then place at room temperature for 15min, place in a 120℃ environment for curing, and ultrasonically clean to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings.

[0020] Comparative Example 3: A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, comprising the following steps: S1: Cut the cast aluminum bronze alloy into appropriate sizes and polish the surface of the cast aluminum bronze alloy with sandpaper. Immerse the cast aluminum bronze alloy and graphite sheet in an oxidizing solution consisting of 100 g / L NaOH, 2 g / L H8MoN2O4, and 50 g / L K2Cr2O7. Connect a DC power supply for surface blackening treatment and adjust the current density to 5 A / dm 2 , oxidation for 10 minutes, laser surface quenching of the as-cast aluminum bronze alloy was performed using a high-power semiconductor laser with a power of 1400W. The laser surface quenching matrix spot was 17mm×1.5mm, and the spot moving rate was 7mm / s. Parallel laser tracks and 50% overlap were used to achieve complete coverage of the aluminum bronze alloy surface for laser surface quenching, and a base layer aluminum bronze alloy was prepared; The thickness of the supersaturated solid solution base layer prepared by laser surface quenching on the surface of the base layer aluminum bronze alloy is 30 μm; S2: The surface of the base layer aluminum bronze alloy is activated by Ar⁺ plasma with a power of 200 W for 30 min. The working layer deposition temperature is set at 400°C, the working pressure is 3.5 Pa, and the base bias voltage is -60 V. The working layer is prepared on the surface of the base layer aluminum bronze alloy by arc ion plating to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings. Among them, the working layer preparation includes the preparation of the initial layer, transition layer and surface layer; The initial layer preparation parameters include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 600 sccm, an oxygen flow rate of 0 sccm, a thickness of 1 μm, and a modulation period of 12.3 m; The parameters for preparing the transition layer include: using the revolution and rotation modes, setting an AlCr target, a nitrogen flow rate of 570 sccm, an oxygen flow rate of 25 sccm, a thickness of 1 μm, and a modulation period of 10 nm; The surface preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1 μm, and a modulation period of 7.1 nm.

[0021] Experiment: Wear resistance test: Using standard sandpaper wear test, 250 mesh SiC sandpaper was used to wear the bearing wear-resistant and corrosion-resistant aluminum bronze surface for 2500 cycles under a pressure of 12.25kPa to test its corrosion current density; Corrosion resistance test: Potential polarization test was carried out in 3.5% NaCl solution with pH=3. The corrosion current density was measured in the potential range of −1 V to 1 V and at a scan rate of 1 mV / s.

[0022] The experimental data are shown in Table 1 below.

[0023] Table 1 Wear-resistant and corrosion-resistant aluminum bronze performance test data for bearings

[0024] Conclusion: The wear-resistant and corrosion-resistant aluminum bronze for bearings prepared by the present invention has excellent corrosion resistance and wear resistance.

[0025] In Comparative Example 1, the base layer obtained by laser surface quenching is missing, resulting in reduced bonding strength between layers, and reduced corrosion resistance and wear resistance of the wear-resistant and corrosion-resistant aluminum bronze for bearings; In Comparative Example 2, the working layer prepared by gradient is missing, resulting in a decrease in the performance of the working layer itself, and thus a decrease in the corrosion resistance and wear resistance of the wear-resistant and corrosion-resistant aluminum bronze used for the bearing; Comparative Example 3 lacks a surface curing coating, resulting in reduced hydrophobicity and increased contact angle of the wear-resistant and corrosion-resistant aluminum bronze surface for bearings. The lack of a filler skeleton leads to reduced wear resistance.

[0026] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for preparing wear-resistant and corrosion-resistant aluminum bronze for bearings, characterized by: The method comprises the following steps: S1: cutting the cast aluminum bronze alloy into suitable sizes, and sequentially performing surface pretreatment, surface blackening treatment, and laser surface quenching on the surface to prepare a base layer aluminum bronze alloy; S2: performing surface pretreatment and arc ion plating deposition on the base layer aluminum bronze alloy in sequence to prepare a working layer aluminum bronze alloy; S3: After laser etching and plasma activation of the surface of the working layer aluminum bronze alloy, immerse it in an organic / inorganic composite solution, vortex for 10-15 minutes, ultrasonicate it at room temperature for 15-20 minutes, leave it at room temperature for 15-20 minutes, place it in a 120-125°C environment for curing, and ultrasonicate it to obtain wear-resistant and corrosion-resistant aluminum bronze for bearings.

2. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 1, characterized in that: During the preparation of the base layer aluminum bronze alloy, the surface pretreatment step specifically includes: polishing the surface of the cast aluminum bronze alloy with sandpaper; the surface blackening step specifically includes: immersing the cast aluminum bronze alloy and the graphite sheet in an oxidizing solution composed of 100g / L NaOH, 2g / L H8MoN2O4 and 50g / L K2Cr2O7, connecting a DC power supply, and adjusting the current density to 5A / dm 2 , oxidation for 10-15 minutes; the specific steps of the laser surface quenching include: using a high-power semiconductor laser with a power of 1400W to perform laser surface quenching on the cast aluminum bronze alloy, the laser surface quenching matrix spot is 17mm×1.5mm, the spot movement rate is 7-8mm / s, and parallel laser tracks and 50% overlap are used to achieve complete coverage of the aluminum bronze alloy surface.

3. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 1, characterized in that: The surface of the base layer aluminum bronze alloy is a supersaturated solid solution base layer prepared by laser surface quenching, and its thickness is 30-50 μm.

4. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 1, characterized in that: During the preparation of the working layer aluminum bronze alloy, the specific steps of the surface pretreatment include: Ar⁺ plasma activation of the working layer aluminum bronze alloy surface, with a power of 200-220W and a time of 30-45min; the specific steps of the arc ion plating deposition include: setting the working layer deposition temperature at 400-405°C, the working pressure at 3.5Pa, and the base bias at -60V, and preparing the working layer on the surface of the base layer aluminum bronze alloy; the working layer preparation includes the preparation of the initial layer, the transition layer, and the surface layer.

5. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 4, characterized in that: The initial layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 600 sccm, an oxygen flow rate of 0 sccm, a thickness of 1±0.1 μm, and a modulation period of 12.3-12.4m; the transition layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 550-570 sccm, an oxygen flow rate of 25-30 sccm, a thickness of 1±0.1 μm, and a modulation period of 10-10.1nm; the surface layer preparation parameters include: using the revolution and rotation mode, setting an AlCr target, a nitrogen flow rate of 300 sccm, an oxygen flow rate of 30 sccm, a thickness of 1±0.1 μm, and a modulation period of 7.1-7.2nm.

6. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 1, characterized in that: During the preparation of wear-resistant and corrosion-resistant aluminum bronze for bearings, the laser etching parameters include: nitrogen atmosphere protection, energy density 1.2-1.5J / cm 2 , scanning speed 600-800 mm / s, pulse width 5-8 ns, focal spot diameter 50-80 μm, surface roughness 0.8-1.2 μm; the plasma activation parameters include: Ar⁺ plasma treatment, power 100-120 W, time 5-6 min.

7. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 1, characterized in that: The preparation method of the organic / inorganic composite solution comprises the following steps: step (1): adding diethylenetriamine and heptafluorobutyric acid to acetone, heating to 80-85°C and stirring for 20-30 minutes, adding epoxy resin, cooling to 40-45°C and reacting for 60-75 minutes to obtain fluorinated epoxy resin; step (2): adding 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane and nano-silica to anhydrous ethanol, heating to 40-45°C, pH 5-5.1, stirring for 2-3 hours, adding fluorinated epoxy resin, KH550 and dispersant, heating to 45-46°C and stirring for 1.5-2 hours to obtain an organic / inorganic composite solution.

8. The process for preparing the wear-resistant and corrosion-resistant aluminum bronze for bearings according to claim 7, characterized in that: During the preparation of the fluorinated epoxy resin, the mass ratio of diethylenetriamine: heptafluorobutyric acid: epoxy resin is 2:8:(8-10); during the preparation of the organic / inorganic composite solution, the mass ratio of 1,1,2,2-tetrahydroperfluorodecyltrimethoxysilane: nano-silica: fluorinated epoxy resin: KH550: dispersant is (1.2-1.5):(4-5):(0.9-1):(0.46-0.5):(0.01-0.012).

9. Wear-resistant and corrosion-resistant aluminum bronze for bearings prepared according to the preparation process of wear-resistant and corrosion-resistant aluminum bronze for bearings according to any one of claims 1 to 8.

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