59 results about "Hard chromium" patented technology

The present invention relates to a device (1) for the electroplating of a hard chromium layer made of a chromium(III) compound on a surface of a substrate (2), comprising an anode (3) and an electroplating bath (4) into which the substrate (2) acting as a cathode can be introduced, wherein the electroplating bath (4) contains a Cr(III) compound and a carboxyl compound of the formula R-COOH or a salt thereof, where R is a C1-10 alkyl radical, characterized in that the anode (3) is separated from the electroplating bath (4) by a cation-selective membrane (5). The present invention further relates to a method for the electroplating of a hard chromium layer made of a chromium(III) compound on a surface of a substrate (2) in this device (1), and to an article produced by this method comprising a chromium layer.

The invention provides an electroplating strengthening method for an aluminum alloy wheel. The electroplating strengthening method comprises the following steps: forming a periodic microstructure on the surface of the aluminum alloy wheel by utilizing a laser micro-etching technology; immersing the wheel into a supercritical carbon dioxide cleaning system to clean oil stains and oxidation films; after cleaning, spraying an active coating containing nano titanate; a high-compactness plating layer is formed in a pulse current electroplating mode; a chemical nickel-phosphorus plating layer and a hard chromium plating layer containing nano metal particles are sequentially formed on the surface of the wheel; performing hole sealing treatment on the electroplated layer by using low-temperature plasma; and coating and curing a flexible UV coating containing an ultraviolet light absorber on the surface of the electroplated layer to form the anti-aging protective film. According to the invention, a novel double cleaning-activating step is adopted in the pretreatment process, and special pre-plating passivation treatment is combined, so that tight combination of an electroplated layer and an aluminum alloy substrate is ensured, and the adhesive force grade reaches 5B, which is obviously superior to that of a traditional process.

The utility model belongs to the technical field of electroplating, and particularly relates to an aircraft spoiler arc-shaped mounting piece hard chromium plating integrated tool hanger which comprises a main body frame, an anode mounting assembly and a cathode mounting assembly are arranged on the main body frame, an arc-shaped mounting piece is arranged on the cathode mounting assembly, and a front anode assembly and a rear anode assembly are arranged on the anode mounting assembly. The front anode assembly is arranged on the concave surface of the arc-shaped mounting piece, and the rear anode assemblies are symmetrically arranged on the convex surface of the arc-shaped mounting piece; a conductive hook is arranged at the top of the main body frame; and an anode conductive belt is arranged on the anode mounting assembly. The spoiler arc-shaped mounting piece is fixed to the cathode mounting assembly, the front anode assembly and the two rear anode assemblies correspond to the electroplating face of the spoiler arc-shaped mounting piece respectively, the front anode assembly and the rear anode assemblies are connected with anodes, the spoiler arc-shaped mounting piece is connected with the cathode, the spoiler arc-shaped mounting piece is electroplated, and the stability of the spoiler arc-shaped mounting piece is improved through the hanging tool. Through the front anode assembly and the rear anode assembly, the uniformity of an electroplated layer is improved, and the product quality is improved.

The invention belongs to the technical field of automobile die-casting dies, and discloses an automobile part die-casting die surface high-wear-resistance and corrosion-resistance treatment process which comprises the steps that a die is cleaned; polishing the surface; mold defects are recognized, and corresponding repairing measures are taken according to different defects; carrying out nitriding treatment on the cleaned and polished die subjected to defect repair; the mold is subjected to gas nitriding treatment, and then key parts and components are subjected to ion nitriding treatment; hard chromium plating treatment; chemical hole sealing and organic coating hole sealing treatment: multi-point detection is carried out, and it is ensured that the hardness of the nitriding layer and the hardness of the chromium plating layer meet the requirement. According to the method, fine defects of the mold can be found, and the wear resistance and corrosion resistance are improved through combination of gas nitriding treatment and key part ion nitriding treatment; through hard chromium plating treatment, surface performance strengthening, double hole sealing treatment, protection effect strengthening and adoption of the nano-powder addition amount and a pulsed electric field directional arrangement method, a plating layer is more uniform and compact, and the hardness and wear resistance of the plating layer are improved.

The invention belongs to the technical field of metal surface treatment, and discloses an electroplating additive suitable for a steel and alloy surface bright wear-resistant corrosion-resistant hexavalent chromium coating, which is characterized by comprising an organic compound, an inorganic acid, a metal inorganic compound and water, the organic compound comprises a mixture of a fluorine-free compound and a fluorine-containing compound. The method can be widely applied to decorative chromium plating and functional hard chromium plating, the electroplating temperature is 40-70 DEG C, the electroplating time of the decorative chromium plating is 1-10 min, the electroplating time of the hard chromium plating is 20 min or above, the hardness can reach 900 HV or above, the glossiness of the surface of a workpiece can be kept through the decorative plating and the hard chromium plating, the current efficiency can reach about 23%, and the service life of the workpiece is prolonged. The current use requirements of high efficiency, stability and environmental protection are met, and the market prospect is good.

The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which belongs to the technical field of hard chromium plated ball processing, and comprises a mandrel main body, and the inner part of the mandrel main body is divided into cavities and is used for realizing uniform expansion; a filling hole is formed in one side of the core shaft main body and is used for filling a hydraulic medium into the core shaft main body; a sealing screw is arranged at an opening of the filling hole; an expansion chamber and a compression chamber are arranged in an inner cavity of the mandrel body, the compression chamber is arranged on one side of a center shaft of the mandrel body, and a linkage structure is arranged in the compression chamber and used for clamping a ball. The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which can solve the problems that the clamping force is concentrated on a local area and a plating layer is easy to crush due to the single-cavity design of the existing liquid expansion mandrel.

The utility model discloses a highway pavement flatness detection device, and belongs to the technical field of highway pavement detection.The detection device comprises a pavement flatness detector vehicle body and an assembly frame installed on the pavement flatness detector vehicle body, and walking wheels are distributed at the lower end of the pavement flatness detector vehicle body at equal intervals; a wheel carrier is rotationally connected to the assembly frame, a measuring wheel is arranged at one end of the wheel carrier, a magnetic block is arranged at the other end of the wheel carrier, and a sensor corresponding to the magnetic block is arranged on the road surface flatness detector vehicle body; transverse movement of the clamping plates is achieved through rotation of the lead screw, the collection control box located between the two clamping plates is clamped or loosened, the surface of the positioning rod is plated with hard chromium, the positioning rod is matched with a linear bearing of the arm plate, it is ensured that the clamping plates move stably, and finally the two clamping plates get close to each other and clamp and fix the collection control box. If the acquisition control box needs to be taken down in the later period, the screw rod only needs to be manually and reversely rotated.

The application belongs to the technical field of alloy materials, and relates to a Cr-Fe alloy layer for prolonging the service life of a barrel and a preparation method thereof. The Cr-Fe alloy layer comprises Cr: 45-85wt%, Fe: 14-54wt%, C: 0-1.2wt%, and O content is less than or equal to 0.3wt%; the Cr-Fe alloy layer is prepared by laser processing, the microstructure is mainly BCC phase, and 3-8% of Cr 23 strengthening phase is uniformly precipitated; the Cr-Fe alloy layer is metallurgically combined with the barrel substrate, the surface Vickers hardness is 400-600HV, and the mass loss is less than or equal to 0.01g in 500 high-temperature erosion wear cycle tests. The Cr-Fe alloy layer with specific components is formed by optimizing laser processing parameters, microcracks of the hard chromium plating layer are effectively repaired, the high-temperature erosion wear loss rate is reduced, and the service life of the barrel is prolonged.

The utility model relates to the technical field of hard chromium plating, in particular to an automatic production device for hard chromium plating, which comprises a frame and a base, a barrel is fixedly connected to the middle of the lower end of a cover, two sides of the barrel are in threaded connection with bolts, rubber layers are fixedly connected to the tail ends of the bolts, and an electroplating box is fixedly connected to the right side of the upper end of the base. And a discharging opening is formed in the lower side of the right end of the electroplating box. According to the automatic production device for hard chromium plating, through cooperation of the moving mechanism and the frame, the first motor drives the connecting rod to rotate clockwise, the first motor is closed after the bent plate moves leftwards to be reset, in this way, the bent plate pushes a box on the conveying belt to the platform, then workers do not need to frequently carry steel pipes, the labor force of the workers is reduced, and the production efficiency is improved. Through the cooperation of the vibration mechanism and the cover body, the steel pipe plated with hard chromium is knocked and vibrated, so that a solution containing plating metal cations on the steel pipe is reduced, workers can pick up the steel pipe conveniently, and the practicability is improved.

The utility model relates to the technical field of mechanical equipment, in particular to a durable hydraulic prop which comprises a hydraulic prop body, a plating layer is arranged outside the hydraulic prop body, the plating layer is a composite plating layer of a copper-tin alloy plating layer and a chromium plating layer, and a passivation zinc plating layer is further arranged outside the chromium plating layer. A hard chromium plating layer is arranged between the chromium plating layer and the copper-tin alloy bottom layer; or a milky white hard chromium plating layer is arranged between the chromium plating layer and the copper-tin alloy bottom layer. The hydraulic prop has the advantages of being more durable and free of dust adhesion.

The invention discloses an aluminum alloy surface anti-corrosion composition and a preparation method and application thereof.In the surface anti-corrosion composition, a WC hard phase provides the framework hardness of a coating, a Co-Cr metal phase endows the coating with good toughness, and the WC hard phase and the Co-Cr metal phase act synergistically, so that the obtained coating has excellent hardness, wear resistance and corrosion resistance; according to the surface anti-corrosion composition, rare earth powder is introduced to serve as an auxiliary, grains can be refined, grain boundaries can be purified in the coating, formation of a denser coating is promoted, an optimized Co-Cr metal phase is combined, and the corrosion resistance of the surface anti-corrosion composition is greatly improved. The long-acting corrosion resistance of the coating in severe environments such as salt mist and damp and hot environments is remarkably improved through synergism, bubbling and stripping of the coating and corrosion of a base body are effectively inhibited, and the remarkable corrosion resistance effect is achieved on the whole.

The utility model discloses a shock absorber working cylinder which comprises a working cylinder body, the inner surface of the working cylinder body sequentially comprises a uniform rough surface layer formed through preliminary honing, a hard chromium plating layer covering the uniform rough surface layer and a fine honing chromium plating layer located on the surface of the hard chromium plating layer, and the hardness of the fine honing chromium plating layer is larger than or equal to 800 HV. The surface roughness Ra is 0.1-0.4 micrometer, the roundness tolerance is smaller than or equal to 0.01 mm, and the straightness tolerance is smaller than or equal to 0.015 mm / 100 mm. Through the multi-layer structural design, the hardness, the surface smoothness and the geometric accuracy of the inner wall of the working cylinder are remarkably improved, friction force and abrasion are reduced, the service life is prolonged, and the durability of the working cylinder of the shock absorber is improved.

The present application discloses a hardware surface treatment process, which first cleans the hardware surface and forms a 0.01 to 0.05 micron thick pre-plating layer; then the pre-plating layer is subjected to microcrystallization treatment and annealed in a protective atmosphere to release internal stress; then a hard chromium layer is electroplated on the annealed hardware, the current density is controlled not to exceed 200 amperes per square meter to ensure uniform deposition; after electroplating, the hard chromium layer is subjected to polishing treatment, and a nanoscale oxide coating is applied to enhance the bonding force with the substrate; then the surface of the hard chromium layer is treated with ultrasonic vibration of 20 to 50 kHz frequency for 5 minutes to eliminate interface stress; finally, a silicone resin protective film is coated on the surface of the hardware, and is cured at 100 to 150 degrees Celsius for at least 1 hour to provide additional stress buffering effect. The present application effectively controls the internal stress between the substrate and the hard chromium plating layer through the above steps, reduces the occurrence of cracks, at the same time enhances the wear resistance and corrosion resistance of the plating layer, prolongs the service life of the hardware.

The invention discloses a visual function examination device for oblique amblyopia patients in the technical field of medical equipment. The visual function examination device comprises a test board, a rack and a microscope base. A lifting device is further installed at the upper end of the testing table, the upper end of the lifting device is connected with a supporting table, the supporting table is located on one side of the lower portion of the lens cone, and the lower end of the auxiliary device is fixed to the outer portion of the lifting device. A servo motor drives a gear and a rack to achieve high-precision lifting of the microscope base, and a bidirectional lead screw and symmetrical clamping blocks are linked to provide self-adaptive head fixing. A sliding groove and a dovetail groove structure of a ball bearing sliding block are matched with connecting rod inclination angle compensation, and head position deviation of a patient is counteracted in real time; the rack is plated with a hard chromium layer, nylon and a glass fiber gear, so that abrasion is reduced, and the transmission efficiency is improved through a graphite self-lubricating lead screw. The device achieves multi-degree-of-freedom closed-loop control, the examination precision error is smaller than or equal to 0.3 degree, and the device is suitable for patients of different ages, has high efficiency and long-acting stability and is suitable for clinical oblique amblyopia accurate diagnosis.

The utility model relates to the technical field of knurled bolts, in particular to a high-toughness wear-resistant knurled bolt for a heavy-duty car. The high-toughness wear-resistant knurled bolt for the heavy-duty car comprises a knurled bolt, and a conical anti-skid sleeve is sleeved on the outer ring of a screw rod of the knurled bolt; according to the knurled bolt, due to the good tensile strength and toughness of the alloy steel and the good wear resistance of the hard chromium, the whole knurled bolt can have high toughness and wear resistance, and when the knurled bolt penetrates through the bolt counter bore in the wheel to be in threaded connection with the threaded hole in the vehicle body, the conical anti-skid sleeve can be tightly attached to the bolt counter bore in the wheel, so that the anti-skid effect is good. And the anti-skid knurls at the bottom of the pressing ring can be tightly attached to the bottom of the inner side wall of the bolt counter bore in the wheel, so that the connection stability between the knurled bolt and the wheel can be effectively improved, the stress change range of the knurled bolt under the action of alternating loads can be reduced, the fatigue life is prolonged, and then the effect of reducing abrasion is achieved.

The invention provides a self-repairing gradient structure chromium-plated roller and a preparation method thereof. The preparation method comprises the following steps: A) carrying out quenching and surface nanocrystallization treatment on the surface of a roller matrix; b) electroplating a gradient transition layer on the surface of the substrate; c) performing pulsed magnetic field annealing treatment on the gradient transition layer; d) carrying out surface nanocrystallization treatment on the gradient transition layer; e, under the ultrasonic condition, a self-repairing working layer is deposited on the surface of the gradient transition layer through pulse current, and working layer electroplating liquid comprises hard chromium main salt, sulfuric acid, nano diamond particles, TiO2 shell / silane-Cr core microcapsules, a dispersing agent and a surface active agent; and F) the self-repairing working layer is subjected to pulsed magnetic field annealing treatment, and the self-repairing gradient structure chromium-plated roller is obtained. The gradient transition layer is introduced between the base body and the working layer, the nanocrystalline layer is constructed through the nanocrystallization technology, and the technical problem that a plating layer of a traditional chromium plating roller is prone to falling off is solved; and microcapsules are introduced into the working layer, so that a self-repairing function is realized.

The invention relates to the technical field of intermediate film embossing, in particular to a continuous embossing method and device for a laminated glass intermediate film, the device comprises guide rollers, a cooling roller, a first embossing mechanism and a second embossing mechanism, and the intermediate film sequentially bypasses the first embossing mechanism, the cooling roller and the second embossing mechanism through a plurality of guide rollers. The first embossing mechanism and the second embossing mechanism are used for respectively embossing the two surfaces of the middle film; each of the first embossing mechanism and the second embossing mechanism comprises a pattern roller and a rubber roller; the rubber roller is rotationally mounted on the main frame and is driven by a motor to rotate; the pattern roller is rotationally installed on the sliding frame through a bearing seat, the sliding frame is fixedly installed on the main frame through a fixing frame, and the pattern roller is driven by a driving motor to rotate. Patterns on the surface of the patterned roller can be specifically protected, a hard chromium plated / Teflon coating on the surface of the patterned roller is prevented from being damaged, the equipment maintenance cost is reduced, and the downtime is shortened.

The invention relates to the technical field of resin-based composite material forming, in particular to a high-finish-degree high-pressure-resistant carbon fiber tube preparation process which comprises the following steps: step 1, tool preparation: preparing a core mold blank from stainless steel, hardening and polishing the surface of the core mold blank, and electroplating hard chromium, so as to obtain a high-finish-degree high-pressure-resistant carbon fiber tube; a core mold with high surface hardness and smoothness is obtained, and then the surface of a core mold blank is coated with a release agent for standby application; step 2, material preparation: selecting T700-grade carbon fibers with the diameter of 0.15 mm; 3, winding, wherein the carbon fiber yarn is led out of the creel and soaked in the resin system. By means of the winding angle design optimized in the annular and oblique alternating mode, the pipe has high strength and rigidity in the axial direction and the annular direction, and internal high pressure and external side pressure can be effectively resisted. Tests show that the sample tube (such as the specification of phi 25mm) prepared by the process can be kept for more than 45 seconds under the internal pressure of 45MPa without cracking or obvious plastic deformation, and the radial deformation is less than or equal to 0.05 mm.

The utility model discloses a power distribution equipment valve mechanism which comprises two guide rods which are symmetrically arranged, an upper valve and a lower valve which are movably arranged on the two guide rods, hard chromium layers are plated on the surfaces of the guide rods, connecting grooves are formed in the two sides of the upper valve and the two sides of the lower valve, connecting sleeves are arranged in the connecting grooves, and the upper valve and the lower valve are connected through the connecting sleeves. The connecting sleeve is connected with the two guide rods in a sleeved mode, a plurality of oil storage cavities are formed in the inner wall of the connecting sleeve in the radial direction and filled with lubricating oil, a wear-resisting ring is arranged between every two adjacent oil storage cavities, and sealing rings are arranged at the positions, close to the outlets, of the two ends of the inner wall of the connecting sleeve. The connecting sleeves are arranged on the two sides of the upper valve and the two sides of the lower valve, so that the upper valve and the lower valve are prevented from making direct contact with the guide rod, the effect of reducing friction is achieved, sliding of the valves is smoother, the clamping stagnation phenomenon is avoided, abrasion is reduced, and the service life is prolonged; and large noise generated when the upper valve and the lower valve slide is avoided.

According to the surface treatment method, the advantages of milky white chromium and hard chromium are combined, milky white chromium is electroplated on the inner surface of a cylinder barrel firstly, then hard chromium is electroplated on the inner surface, and finally a composite protective coating which can improve the corrosion resistance of the inner surface and the wear resistance of the inner surface and is excellent in binding force is obtained. The technical problems that the inner surface of an existing cylinder barrel is prone to rusting, abrasion, scratching and the like due to the fact that no effective protective coating exists on the inner surface of the cylinder barrel are solved, the method is reasonable, feasible and ingenious in design, the corrosion resistance of the inner wall of the jack cylinder barrel can be improved, the abrasion resistance of the inner wall of the cylinder barrel can be improved, and the protective coating is excellent in binding force. And the service life of the jack is prolonged.

Sleeves that can be disposed on either end of a bushing to improve the wear characteristics and usable lifetime of the bushing is disclosed. During the use of the bushing, such as when a machine including the bushing is operated, the sleeves may be in primary contact with abrasive elements (e.g., other parts of the machine, dirt, rock, etc.) and wear, while the underlying bushing is protected, at least in part, from wear and tear. The sleeves may include a bulk material, such as steel, with a hard coating thereon, such as hard chromium, tungsten carbide, or the like. The hard coating may be formed by any variety of processes, such as electroplating, plasma deposition, thermal deposition, or the like. In some cases, the sleeves, after being worn from use, may be replaced or refurbished to further extend the lifetime of the bushing.

The invention relates to the technical field of alloy materials, in particular to a Cr-Fe functional alloy material for prolonging the service life of a gun barrel and a preparation method thereof.The alloy comprises, by mass, 74%-78% of Cr, 22%-56% of Fe and 0.5%-1.2% of C. The microstructure is mainly composed of a BCC phase (larger than or equal to 85%), and Cr23C6 strengthening phases (3%-8% and 0.2-3.0 microns) are evenly separated out. During preparation, laser remelting is conducted on a pre-plated hard chromium base body under nitrogen protection, the laser power density is 4.95 * 10 < 4 >-9.20 * 10 < 4 > W / cm < 2 >, the scanning speed is 5-80 mm / s, preheating is conducted to 400 DEG C, and gradient cooling is conducted; the integrated visual system regulates and controls parameters in real time, the depth-to-width ratio of a molten pool is guaranteed to be 1: 1.5-1: 2.5, and the Cr / Fe distribution standard deviation is smaller than or equal to 5%. The interface dislocation density of the alloy is larger than or equal to 1 * 10 < 14 > m <-2 >, the high-temperature abrasion mass loss is smaller than or equal to 0.01 g, the abrasion resistance is three times that of original hard chromium, and the service life of a gun barrel is remarkably prolonged.

The invention discloses a feeding valve capable of resisting abrasion and swinging. The feeding valve comprises a feeding valve body, a valve element and a swinging structure. A material channel is arranged in the feeding valve main body, the valve core is movably arranged in the material channel and is used for controlling the material flow, a rotating shaft is arranged on the swinging structure, the swinging structure is connected with the valve core through the rotating shaft, and the power device is connected with the rotating shaft and is used for driving the rotating shaft to drive the valve core to swing. Compared with the prior art, the wear resistance is improved, and the service life of the valve is remarkably prolonged through the multi-layer composite coating (hard alloy and hard chromium plating) on the valve element and the silicon nitride inner wall coating of the material channel. And the double-hinge assembly is combined with the buffer spring, so that impact wear can be reduced, and high-pressure working conditions can be adapted. And intelligent maintenance: a wear sensor is linked with a control system, so that predictive maintenance can be realized. And rapid replacement is achieved, the valve element can be rapidly replaced through the modular valve element design, and therefore the downtime is shortened.

The utility model discloses an angle-adjustable spray cleaning device for hard chromium plating of an air valve, which comprises a booster pump and further comprises an anti-suck-back assembly, the anti-suck-back assembly comprises a water box, a water inlet pipe is installed on one side of the water box in a butt joint mode, an adapter is installed on one side of the water inlet pipe in a butt joint mode, a sliding groove and a spring groove are respectively arranged on the side wall of the adapter, and the sliding groove is communicated with the spring groove. A guide rod and a tension spring are arranged in the sliding groove and the spring groove correspondingly, and the end of the guide rod and the end of the tension spring are connected with cover plates correspondingly. And a nozzle is arranged on one side of the water box. By means of the anti-suck-back assembly with the booster pump and the water inlet pipe independent of each other, the water inlet pipe pushes open the cover plate to feed water when water enters the water inlet pipe; and when suck-back occurs due to too high internal air pressure, the cover plate can hermetically cover the surface of the water tank under the action of the tension spring and the guide rod, so that the water tank with the design directly avoids the suck-back problem, the water pressure of the air pump is indirectly improved, and the water spraying effect of the spray head is better.

The present invention provides a kneading rotor, a kneading machine, a method for kneading a rubber material, and a method for manufacturing a kneading rotor. The kneading rotor is used in a kneading machine, and its base material is formed of carbon steel or alloy steel for mechanical structures. At least a part of the surface of the base material has a stacked layer formed of austenitic stainless steel, and at least a part of the surface of the stacked layer has a hard chromium plating layer. Accordingly, a kneading rotor with excellent corrosion resistance and abrasion resistance, and which is inexpensive and safe can be provided.

The utility model discloses a high-strength wear-resistant change gear set, and belongs to the technical field of gears. The gear set comprises a multi-stage speed change gear, a gear set center shaft and a speed regulation gear ring which are all made of carburized and quenched alloy steel. The gear tooth middle section of the change gear is provided with an oil passing groove to improve lubrication, tooth surface bevel angles are machined at the two ends of the tooth crest to reduce meshing impact, and a tooth bottom groove is plated with a hard chromium wear-resistant layer to improve wear resistance; shaft hole oblique angles are arranged on two sides of the central shaft hole and are matched with transition oblique angles of the central shaft to reduce assembly friction; and the contact area of the adjacent gears is reduced by the annular tooth surface grooves at the spokes. Through structural optimization and surface strengthening, the wear resistance and the contact strength of the gear are remarkably improved, the service life of a change gear set is prolonged, and the gear set is suitable for a high-load gearbox system.

The invention belongs to metal material surface treatment, and particularly discloses a CT bulb tube electroplating method and an electroplating tool, and the method comprises the following steps: carrying out insulation shielding on a CT bulb tube; hanging the CT bulb tube after insulation shielding; and immersing the hung CT bulb tube in an electroplating solution for electroplating to obtain the CT bulb tube with an electroplated layer. The hard chromium-black chromium composite coating which is uniform, high in binding force and high in radiation efficiency can be prepared on the surface of the CT bulb tube, so that the performance of the CT bulb tube is improved, and the service life of the CT bulb tube is prolonged.

The invention relates to the technical field of remanufacturing and surface engineering of key parts of a helicopter transmission system, in particular to a partition repairing method for corrosion of an inner spherical shell of a speed reducer. Comprising the following steps: dividing a to-be-repaired inner spherical shell of the speed reducer into an inner spherical area and a cylindrical surface and end surface area; the corrosion layer of the inner spherical surface area is removed, the inner spherical surface area with the corrosion layer removed is obtained on the inner spherical surface shell of the speed reducer, a hard chromium layer is prepared on the inner spherical surface area with the corrosion layer removed through electroplating, and the electroplated inner spherical surface area is obtained on the inner spherical surface shell of the speed reducer after accurate grinding; the method comprises the steps that a cylindrical surface and an end face area are obtained, a corrosion layer on the cylindrical surface and the end face area is removed, the cylindrical surface and the end face area with the corrosion layer removed are obtained, a copper-aluminum layer is prepared on the cylindrical surface and the end face area with the corrosion layer removed through plasma spraying, and an inner spherical area obtained after plasma spraying is obtained on the inner spherical shell of the speed reducer after accurate grinding. The problem of part missing caused by corrosion of the inner spherical shell is solved.

The application discloses a carbide modified abrasion-resistant alloy steel and a preparation method and application thereof, and relates to the technical field of wear-resistant steel. By adding a higher Cr element and combining with the addition of a proper amount of C element, the solid solution strengthening effect of the steel and the precipitation of hard chromium-containing carbides are ensured, which is beneficial to the improvement of the wear resistance of the steel. In addition, by controlling the addition amount of the C element, after the precipitation of the carbides, part of the carbon still exists in the matrix, which promotes the final formation of hard and tough lath martensite and avoids the generation of high-carbon brittle acicular martensite. Moreover, by adding the higher Cr element and proper amounts of Ni and Mo elements, the steel can still maintain a passivation state in a weak acid corrosive environment, so that the corrosion resistance of the steel is increased. Furthermore, V, Zr and Re in the steel can also react with C to precipitate carbides in the matrix, which can effectively control the size of the carbides, so that the wear resistance of the steel is ensured while the toughness and corrosion resistance of the steel are not damaged.

The utility model discloses a tool for electroplating hard chromium on a star-shaped dial wheel, which comprises a hanging frame, an upper positioning plate and a lower positioning plate are arranged in the middle of the hanging frame, the upper positioning plate is connected with the lower positioning plate through a connecting screw rod, two pictographic workpieces are arranged between the upper positioning plate and the lower positioning plate, and the pictographic workpieces are connected with the hanging frame. The elephant-shaped workpiece is connected with the upper positioning plate and the lower positioning plate through the connecting screws, a plurality of auxiliary anode bars are vertically arranged on one side of the upper positioning plate and one side of the lower positioning plate, the electro-deposition thickness of the electroplated surface of the tool is evenly distributed, and control over the product machining size and the subsequent polishing process is facilitated.