73 results about "Chromium coating" patented technology

The embodiment of the invention provides a modifier component of a chromizing coating and a modification method. The modification method comprises the following steps: carrying out surface cleaning, polishing and acid pickling treatment on a workpiece to be subjected to chromizing, cleaning with deionized water and alcohol, and drying for later use; the preparation method comprises the following steps: weighing and preparing solid-phase components in proportion, and carrying out ball milling to obtain solid-phase permeating agents with different proportions for later use; and the workpiece to be infiltrated and the solid-phase infiltrating agent are placed in an embedding infiltrating tank together and placed in a vacuum heating furnace for heat treatment, and after heat preservation is finished, the workpiece is cooled to the room temperature and taken out. According to the modifier components and the modification method of the chromizing coating, a prepared chromizing layer is uniform in organization structure, moderate in thickness, sufficient in Cr atom diffusion, good in metallurgical bonding with a matrix and not prone to falling off, and the chromizing coating is suitable for austenitic steel and high-temperature alloy parts used for workpieces with the large length-diameter ratio and various complex shapes such as large boilers and oil and gas field conveying pipelines. And the method has excellent industrial batch production benefits.

The utility model discloses a quick compounding machine for bubble-free pearl wool, which comprises a rack, an extrusion component, a pressure adjusting component, a first pressure measuring component and a second pressure measuring component, a sliding chute is arranged at the top end of the rack, a hard chromium coating is arranged on the inner side of the sliding chute, the extrusion component is arranged at the top of the rack, and the pressure adjusting component is arranged on the top of the rack. The pressure adjusting assembly comprises an air cylinder arranged at the top end of the rack and a moving seat arranged on the left side of the air cylinder, and the first pressure measuring assembly comprises a fixing plate connected to the left side of the moving seat through screws, a positioning rod arranged on the left side of the fixing plate, a spring arranged on the left side of the fixing plate and a baffle arranged on the left side of the spring. The second pressure measuring assembly is arranged on the left side of the pressure adjusting assembly. Through the arrangement of the rack, the first pressure measuring assembly and the second pressure measuring assembly, under the condition that the compounding of the rapid compounding machine is not influenced, the anti-wear performance is greatly improved, and meanwhile, the pressure at the two ends of the extrusion roller can be detected in real time, so that the problem of non-uniform pressure can be found in time.

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.

A cooktop according to one embodiment of the present disclosure may include a cooktop body, a ceramic glass disposed on the upper part of the cooktop body and having a through-hole formed in a part thereof, a bracket disposed on the through-hole, a glass member coupled to the bracket so as to be disposed within the through-hole, and a display device disposed on the lower side of the glass member. The bracket may include a metal member and a chrome coating layer coated on the metal member.

The invention discloses a method for preparing a hydrophobic coating on an electroplated chromium surface, which comprises the following steps: adding dispersion liquid of nano particles into chromium plating liquid to obtain composite chromium plating liquid, and electroplating a workpiece by using the composite chromium plating liquid to obtain a chromium plating layer, the nano particles are at least one of silicon dioxide, silicon carbide or silicon nitride, silica sol and silicon-fluorine-containing resin are sequentially applied to the chromium plating layer, and the hydrophobic coating is obtained after drying. According to the invention, the nano particles are doped with the electroplated chromium, the chromium plating layer contains Si, so that Si-OH bonds are formed on the surface of the electroplated chromium, silica sol is used as a silicon transition layer, the lower part of the silica sol can form Si-O-Si chemical bonds with Si-OH in the chromium plating layer, and the upper part of the silica sol can form Si-O-Si chemical bonds with Si-OH bonds in silicon-containing fluorine resin; and the binding force of the hydrophobic coating and the chromium plating layer is greatly improved.

The present application discloses a chromium coating modified on the basis of V2O5 and a preparation method therefor. Components of a solid-phase diffusion agent used are: Cr: 30-50%; V2O5: 2-7%; SiC: 30-50%; NH4Cl: 1-5%; La2O3: 0-5%; and Y2O3: 2-5%. The chromium coating prepared in the present application has a uniform structure, a moderate thickness, sufficient diffusion of Cr atoms, and good metallurgical bonding between a diffusion layer and a substrate, is suitable for austenitic steel and high-temperature alloy components which are used in large boilers, oil and gas field transportation pipelines and other workpieces having a large aspect ratio and various complex shapes, and achieves excellent industrial mass production benefits.

The invention discloses a chromium coating crack repairing method and device based on high-pressure water repellent filling, and the method comprises the steps: selecting high-pressure gas according to the working or testing pressure of a part, and extruding a water repellent into a crack gap of a chromium coating by using the selected high-pressure gas; in the extrusion process of the water repellent, the water repellent is driven to reciprocate on the surface of the chromium layer of the part, and dynamic infiltration is achieved; after the crack gap is filled with the water repellent, curing of the water repellent on the surface layer and the root is accelerated in a heating mode, the water repellent is prevented from flowing out, and blocking of the crack gap is achieved; and honing the surface of the chromium layer by using a honing device, removing the water repellent on the surface, and improving the surface roughness. Therefore, the water repellent can permeate into the air hole or the root of the crack to fill the whole crack, so that the compactness of the chromium layer and the qualified rate of the air tightness test of the chromium layer are effectively improved.

The invention discloses a high velocity oxy-fuel spraying method for a titanium alloy irregular arc surface. The high velocity oxy-fuel spraying method comprises the following steps that S1, the titanium alloy with the irregular arc surface is pretreated; s2, shielding the non-spraying surface of the irregular arc surface titanium alloy pretreated in the S1; s3, carrying out sand blasting treatment on the to-be-sprayed surface of the irregular arc surface titanium alloy subjected to shielding treatment in S2; and S4, the spraying face of the irregular arc face titanium alloy subjected to sand blasting treatment in the S3 is preheated through supersonic flame, spraying is conducted on the spraying face, when the variable cross section of the irregular arc face titanium alloy is met, the distance between a spraying gun and the spraying face is adjusted to be 5-20 mm, meanwhile, the angle of the spraying gun is adjusted to be 70-90 degrees, overall spraying is conducted for 15-20 times, and the final thickness of a coating is 40-80 microns. By means of the method, the uniformity and compactness of the flame spraying coating of the irregular arc surface of the titanium alloy can be guaranteed, and the coating with the wear resistance superior to the function of a chromium plating layer can be obtained.

The utility model relates to the technical field of rubber balls, and discloses a high-temperature-resistant and wear-resistant vibrating screen rubber ball which comprises a solid ball center, a rubber ball body is connected to the outer surface of the solid ball center, and a wear-resistant mechanism is arranged on the rubber ball body. The wear-resistant mechanism comprises a chloroprene rubber coating, a polyacrylate resin coating, a waterborne polyurethane resin coating, an aluminum oxide ceramic coating, a tungsten carbide ceramic coating, a polytetrafluoroethylene coating and a chromium coating, and the chloroprene rubber coating is connected to the outer surface of the solid ball center. The waterborne polyurethane resin coating has good flexibility, wear resistance and water resistance, can adapt to deformation of the rubber ball in the vibration process, and is not prone to cracking, falling off and other problems at high temperature. And reactive groups can be introduced for crosslinking or compound modification, so that the mechanical property and chemical resistance of the material are further improved.

The utility model relates to a through type position lamp and a vehicle. The through type position lamp comprises a lampshade and a lamp shell. The lampshade comprises a light-transmitting cover and a light shielding cover fully covering the outer surface of the light-transmitting cover. The outer surface of the light shield is provided with a chromium plating layer, and the front side face of the light shield is provided with a narrow-strip-shaped hollowed-out hole extending in the length direction, so that a narrow-strip-shaped light-transmitting area is formed in the hollowed-out hole of the light-transmitting cover. An inserting groove is formed in the side, facing the lampshade, of the lamp shell, the light-transmitting cover extends backwards to be provided with an inserting-connecting extending part exceeding the coverage range of the light-transmitting cover, and the inserting-connecting extending part is embedded into the inserting groove. According to the scheme, the chromium plating layer and the hollowed-out holes are arranged on the light shield, so that the lampshade integrates functions and appearance decoration, the lampshade can serve as an outer part when not turned on and serve as a functional part when turned on, and the delicacy of the whole vehicle and the competitiveness of the product are synchronously improved on the premise of meeting functional requirements.

The invention relates to the technical field of semiconductors, and discloses a chromium coating for a photomask substrate, a preparation method of the chromium coating, a photomask and a semiconductor element, the chromium coating is a pure chromium coating and has a single microstructure or a composite microstructure; wherein the single microstructure comprises any one of an amorphous state, a polycrystalline state and an amorphous-nanocrystalline mixed state; the composite microstructure comprises at least two of an amorphous state, a polycrystalline state and a mixed state; and the mixed state is a transition state microstructure of amorphous polycrystalline transformation. By regulating and controlling the microstructure of the pure chromium target, the chromium coating for the photomask substrate can meet the design target of optical density of unit thickness at the wavelength of 193nm under the condition of ultra-thin thickness, so that the three-dimensional mask effect caused by a thick chromium layer is avoided, and the contradiction of insufficient shading of the thin chromium layer is solved. Meanwhile, the mode based on the pure chromium material assisted by magnetron sputtering current regulation and control does not need a complex reaction gas system, the process window is wide, the reproducibility is good, and the method is suitable for industrial batch production.

The invention relates to the field of suspended ceiling decoration, and discloses a construction process of a mildew-proof suspended ceiling, which comprises the following steps: S1, pretreatment of a base layer: firstly cleaning floating ash and greasy dirt on a concrete top plate, repairing cracks and uneven parts with epoxy mortar, and then brushing water-based mildew-proof permeable primer added with an isothiazolinone-containing antibacterial agent; s2, fixing a light steel keel: selecting the light steel keel, spraying a zinc-chromium coating in advance, and fixing the light steel keel on the concrete top plate through an expansion bolt; and S3, a damp-proof layer is laid, specifically, a layer of polyethylene film is laid between the framework and the decoration panel, joints are sealed, a layer of aluminum foil composite damp-proof coiled material is additionally arranged, the two layers of joints are staggered, and the film is folded along the wall face and fixed through pressing strips. The polyethylene film is matched with the butyl adhesive tape to seal the seam, moisture can be effectively prevented from invading from the position below the suspended ceiling, the moisture can be prevented from permeating into the suspended ceiling through the wall face, the risk that the decoration panel is mildewed and deformed due to damp is reduced, and the service life of the suspended ceiling is prolonged.

The utility model discloses a hydraulic cylinder with good corrosion resistance, and relates to the technical field of hydraulic cylinders. Comprising an outer-layer cylinder barrel, an inner-layer cylinder barrel is installed in the outer-layer cylinder barrel, a closed end cover and a through hole end cover are installed on the two sides of the outer-layer cylinder barrel respectively, and a plurality of fixing rods with threads on the two sides are installed between the closed end cover and the through hole end cover; anti-corrosion sealing assemblies are arranged between the outer-layer cylinder barrel and the inner-layer cylinder barrel and the closed end covers on the two sides and between the inner-layer cylinder barrel and the through hole end covers on the two sides. Through the design that the anti-corrosion medium is filled between the outer-layer cylinder barrel and the inner-layer cylinder barrel, an additional anti-corrosion guarantee is provided for the inner-layer cylinder barrel, even if the piston rod works in a severe environment for a long time, the anti-corrosion performance of the cylinder body can be ensured, and the requirement for working in a complex environment for a long time is met; layer-by-layer protection is realized from the primer to the finishing coat to the chromium plating layer, so that the corrosion resistance is greatly improved, and the problem that the coating is easy to wear and fall off is effectively solved.

The application relates to the technical field of electroplating, and discloses a chromium electroplating process for improving the hardness of a connector terminal, which comprises the following steps: performing surface pretreatment on the connector terminal, removing surface impurities through ultrasonic cleaning and micro-etching treatment; performing heating treatment on the connector terminal; performing electroplating treatment on the connector terminal by using an electroplating solution comprising trivalent chromium salt, boron nitride nanoparticles, ferroferric oxide nanoparticles, nickel ions, sodium dichromate and chromium alloy additives, so as to form a chromium plating layer; performing passivation treatment on the plating layer; performing low-temperature treatment on the plating layer; and spraying a protective layer on the chromium plating layer. Through the trivalent chromium salt and the sodium dichromate, the trivalent chromium salt is used to reduce hexavalent chromium ions into trivalent chromium, the toxicity of the hexavalent chromium is reduced, the sodium dichromate is used to provide a stable chromium source, the deposition of chromium elements in the electroplating process is ensured, the pollution of hexavalent chromium to the environment and the harm of hexavalent chromium to the health of operators are solved, and the environmental protection and safety of the electroplating process are improved.

The utility model provides a sealing nail welding dust hood, relates to the technical field of welding dust hoods, and solves the problems of welding defects and insufficient negative pressure dust collection effect caused by high surface roughness and residual welding ash of the conventional dust hood. The welding dust removal cover comprises a welding dust removal cover body, a welding dust removal cavity is formed in the welding dust removal cover body, and a bonding layer and a smooth surface layer are sequentially arranged on the inner wall of the welding dust removal cavity. The smooth surface layer is a chromium-plated layer, the bonding layer is a sand blasting treatment layer, the surface roughness Ra of the chromium-plated layer is 0.4-0.8 [mu] m, and the thickness of the chromium-plated layer is 5-15 [mu] m. The utility model has the beneficial effects that the welding ash residue is obviously reduced, and the cleaning efficiency is improved.

The invention belongs to the field of scissor manufacturing, and particularly relates to a pair of stainless steel scissors with a long sharp period, which is specially used for cutting composite materials. At present, special industrial scissors with high cost performance are lacked in the market to meet the shearing requirements of composite materials such as quartz glass fiber cloth and the like. The long sharp period stainless steel scissors are used for cutting composite materials, the cutting edge angle is 20 degrees, the long sharp period stainless steel scissors comprise a stainless steel base body and multiple layers of coating films on the base body, the material of an inner side bottom layer is an aluminum coating layer formed by vacuum coating, and the thickness of the inner side bottom layer is 0.3-0.8 micrometer; the middle transition layer is made of a chromium coating formed by vacuum coating, and the thickness of the middle transition layer is 0.5-1 [mu] m; the outer functional layer is made of titanium-aluminum alloy formed by vacuum coating, and the thickness of the outer functional layer is 1-2 microns. The sharpness period of the stainless steel scissors is greatly prolonged, the cutting quality of the radome in the prepreg laying process is improved, the production efficiency is improved, and the sharpness period of the scissors is prolonged to 70 meters.

The present invention relates to a quality inspection system for chromium coating layer of enhanced accident tolerant fuel for nuclear power plants, the quality inspection system allowing rapid transport and inspection of objects to be inspected, and classifying and automatically and separately loading the inspected objects according to the results of the inspection. The quality inspection system according to the present invention comprises an apparatus for feeding objects to be inspected, a rotary transport apparatus, a sorting and loading apparatus, and a control apparatus, wherein the rotary transport apparatus comprises a base unit, first and second rotary transport units, a power generation unit, a power transmission shaft, and a support unit for objects being inspected.

The utility model relates to the technical field of engines, in particular to a valve seat, a methanol ejector and an engine. The utility model provides a valve seat which is suitable for a methanol injector and comprises a valve seat body and a corrosion-resistant structure, and the valve seat body is provided with an oil passing channel and an injection hole communicating with the oil passing channel; a needle valve part of the methanol ejector is positioned in the oil passing channel and axially moves relative to the valve seat; a sealing part is arranged on a part of the peripheral surface of the needle valve piece, a sealing surface is formed on a part of the inner wall surface of the oil passing channel, and the sealing part of the needle valve piece is matched with the sealing surface of the oil passing channel to close the spray hole; the corrosion-resistant structure is arranged on the sealing face and comprises at least one chromium coating and at least one chromium nitride coating. The methanol ejector comprises the valve seat. The problem of cavitation of the sealing face of the valve seat of the methanol ejector can be effectively solved, the sealing performance of the valve seat is improved, then the working stability of the methanol ejector is improved, leakage is reduced, and the service life is prolonged.

According to the high-erosion-resistance steam turbine blade and the preparation method thereof, nickel-chromium-aluminum-yttrium alloy on the bottom layer is tightly combined with the surface of a base material, and the thermal stress difference between a coating and the base material can be effectively buffered; the middle layer is compounded with titanium carbide through nickel-chromium-aluminum-yttrium alloy, so that smooth performance transition from the bottom layer to the surface layer is realized, the overall toughness of the coating is enhanced, and interlayer cracking is avoided; the composite structure of the tungsten carbide on the surface layer and the nickel-chromium-aluminum-yttrium alloy endows the coating with extremely high hardness, wear resistance and erosion resistance, can enduringly resist erosive wear of water drops and solid particles in steam, prevents pits, pits and cracks from being formed on the surface of the blade, and maintains the integrity of the aerodynamic appearance. Multidirectional upsetting and step-by-step isothermal forging are combined, base material grains are refined, and the structure uniformity is improved; the microstructure is optimized through solid solution aging treatment, and the strength and toughness of the base material are enhanced; according to the composite coating prepared through the atmosphere plasma spraying technology, the binding force of all the layers is excellent, and the defects that a traditional chromium plating layer is prone to stripping, and the binding force of a spraying layer is insufficient are effectively overcome.

The utility model discloses a flexible steel roller, which comprises a roller body and roller shafts, the paired roller shafts are respectively and fixedly arranged at the centers of the two ends of the roller body, the surface of the roller body is coated with a rubber layer, the surface of the rubber layer is coated with a steel belt layer, the surface of the steel belt layer is coated or permeated with a chromium plating layer, and the chromium plating layer is coated or permeated with the rubber layer. The steel roller has the advantages that the rubber layer and the steel belt layer are sequentially arranged on the surface of the roller body, the steel belt layer on the surface guarantees rigidity of the steel roller, the rubber layer on the inner side of the steel belt layer enables the steel roller to have certain flexibility, when the steel roller is used, the steel roller with certain flexibility can well protect materials, especially film materials, and the service life of the steel roller is prolonged. And in addition, the steel roller can be protected to a certain degree, and deformation damage to the steel roller is prevented.

The invention provides a method for plating a copper alloy part with a complex profile with thick chromium. The method comprises the following steps: cleaning a to-be-plated part; performing shielding protection on the non-chromium-plated surface of the cleaned part; local cleaning is conducted on the to-be-chromium-plated face of the part subjected to shielding protection; ion chromium plating is conducted on the part with the to-be-chromium-plated face cleaned up; the shielding protection of a non-chromium-plated surface is removed, and a part locally plated with thick chromium is obtained; wherein the part to be plated is the inner bottom of the injector of the combustion chamber of the engine, the outer wall of the part is of a milling groove structure, and a plurality of through holes for mounting nozzles are formed in the bottom surface of the part. The coating which is resistant to high temperature, free of volatility and easy to clean and remove after being cured at high temperature is selected, the protective coating is sprayed before plating to shield a non-chromium-plated surface, and the chromium plating layer which is well combined with a base body and meets the use requirement is obtained by adopting the proper technological methods of pretreatment, shielding, ion chromium plating and the like.

The invention discloses a periodic chromium plating method for improving the corrosion resistance of a workpiece chromium layer. The method sequentially comprises the following steps: (1) chemical deoiling, (2) hot water washing, (3) anodic pickling, (4) cold water washing, (5) neutralizing, (6) cold water washing, (7) mounting and hanging, (8) periodic chromium plating, (9) recycling, (10) cold water washing and clamp dismounting, # imgabs 0 # neutralizing, # imgabs 1 # cold water washing, # imgabs 2 # blow-drying and # imgabs 3 # checking. By the adoption of the process method, the thickness uniformity of the chromium plating layer is improved, the length of inherent hair cracks of the chromium plating layer is shortened, the number of the hair cracks is reduced, the probability that a corrosion medium enters a corrosion matrix through the cracks is reduced, the plating layer performance is improved, and the corrosion resistance of the chromium plating layer is improved essentially.

The application relates to a roller repairing chromium plating strength testing device and relates to the field of roller repairing devices, which comprises a table plate, two vertical plates are slidably connected on the table plate and arranged along the length direction of the table plate, the height of the vertical plates is telescopic, control assemblies for clamping rollers are arranged on the two vertical plates, power members for controlling the movement of the two vertical plates are further arranged on the table plate, cleaning assemblies for cleaning the side walls of the rollers are further arranged on the table plate, the cleaning assemblies are located on one side of the control assemblies, the testing device further comprises a cutting assembly, the cutting assembly comprises a blade, the blade is located on one side of the control assemblies, and the blade and the cleaning assemblies are symmetrically distributed on the two sides of the control assemblies. The application has the effect of improving the detection efficiency of the roller chromium plating layer.

The application belongs to the field of transistor devices, and discloses an organic field effect transistor device and a preparation method thereof. The preparation method comprises the following steps: preparing a covalent triazine organic framework nanosheet dispersion liquid by electrochemical exfoliation of a covalent triazine organic framework material, and standing; injecting the covalent triazine organic framework nanosheet dispersion liquid drop by drop onto the liquid surface of ultrapure water, and passing a SiO2 / Si substrate through the interface between the covalent triazine organic framework nanosheet and the ultrapure water to obtain a SiO2 / Si substrate containing triazine covalent organic framework nanosheets; and sequentially evaporating a chromium layer and a gold layer on the SiO2 / Si substrate containing triazine covalent organic framework nanosheets by using a vacuum thermal evaporation coating machine to obtain the organic field effect transistor device. The application is conducive to widening the application range of the organic field effect transistor device prepared according to the covalent triazine organic framework material.

The utility model discloses a high-hardness nickel-free electrolytic corrosion-resistant coating structure, which comprises a pretreated product base layer and a conductive copper layer attached to the outer surface of the pretreated product base layer. According to the electroplating structure disclosed by the utility model, the passivation treatment film coating layer and the like are arranged, so that when the electroplating structure is used, the electrolytic corrosion resistant composite coating is additionally arranged on the outermost layer of the electroplating structure; the electrolytic corrosion resistant composite plating layer is composed of a decorative chromium plating layer attached by electroplating, a passivating treatment film coating layer attached by chemical plating and a sealing agent coating layer for coating, so that the brightness and attractiveness of the product can be improved by utilizing the decorative chromium plating layer; a compact protective film is formed on the surface of the plating layer through the passivating coating layer attached through chemical plating, the corrosion resistance of the plating layer is improved, the sealing agent is coated through the sealing agent coating layer, a second protective film is formed on the surface of the plating layer, and therefore the electroplating structure achieves the multi-stage electrolytic corrosion resistance protection effect.

The invention provides electroplating liquid of an electrochemical deposition trivalent chromium coating doped with rare earth elements, a preparation method and a use method of the electroplating liquid and a bathroom product. The electroplating liquid comprises the following components in parts by mass: 1000 parts of water, 20-60 parts of trivalent chromium salt, 0.1-1 part of a rare earth element doping agent, 0.5-5 parts of a transition metal element doping agent, 50-80 parts of a complexing agent, 40-75 parts of conductive salt, 30-60 parts of boric acid, 1-5 parts of a metal cation blackening agent and 0.5-2 parts of a nonionic surfactant. A chromium layer obtained by electroplating a product through the electroplating liquid remarkably improves the corrosion resistance of the product.

The utility model relates to the technical field of chromium plating fixture for metal product production, concretely is a kind of chromium plating fixture for metal product production, including sliding frame, sliding slot, at least two sliding blocks, mounting bracket and clamping assembly, clamping assembly is installed in the bottom of mounting bracket, the clamping assembly includes sliding column, support plate, lift plate and limiting component, metal product parts are fixed on fixture by clamping assembly, when part is clamped, pull sliding column, the movement of sliding column will drive lift plate to move, since part is fixed on lift plate, so the movement of lift plate will gradually immerse part in chromium plating liquid, avoid fixture body contact chromium plating liquid and be plated, chromium plating layer is only deposited on the surface of part, also avoid the oblique or impact type immersion caused by traditional manual holding fixture, ensure that chromium plating layer is evenly attached along the surface of part.

The present invention relates to the technical field of chrome plating, and specifically to a processing technology for a composite chromium coating on the inner bore of a gun barrel, which includes the following steps: S1, pretreatment; S2, glow cleaning; S3, first multi-arc ion plating; S4, pulsed etching; S5, second multi-arc ion plating; S6, cooling and discharging. By using the multi-arc ion plating technology to prepare a Cr coating on the surface of the inner bore of the gun barrel, the present invention significantly improves the wear resistance of the inner bore of the gun barrel, effectively reduces the wear during the shooting process, and significantly improves the oxidation resistance of the inner bore of the gun barrel, thereby prolonging the service life of the gun barrel.

The vehicle logo comprises a body formed through injection molding, the surface of the body sequentially comprises a first electrochromism layer, a laser etching layer and a second electrochromism layer from bottom to top, the first electrochromism layer is a high-brightness electrochromism layer, and the laser etching layer is a wiredrawing texture formed on the surface of the first electrochromism layer through a laser etching process. And the second electrochromism layer covers the first electrochromism layer and the wiredrawing textures. According to the principle of the utility model, high-brightness electroplated chromium is formed on the surface of the body through vacuum electroplating, so that a metal texture is formed; the laser etching layer is provided with wiredrawing grains engraved on the surface of the first electrochromism layer by a laser etching machine; and re-electroplating chromium on the first electroplating chromium layer to re-plate a chromium layer on the electroplating layer subjected to laser etching, and finally forming a metal wiredrawing texture effect.

The invention relates to the technical field of chromium plating layers, in particular to a preparation method of a wear-resistant heterogeneous pure chromium plating layer. The method comprises the following steps: performing surface treatment on a workpiece and pure chromium powder; dispersing the treated pure chromium powder in the electroplating solution by adopting an ultrasonic method to form an electroplating solution colloid; the workpiece is connected with a cathode of a direct-current power supply to serve as an electroplating cathode plate, the lead-tin alloy plate is connected with an anode of the direct-current power supply to serve as an electroplating anode plate, and the electroplating cathode plate and the electroplating anode plate are arranged in the electroplating liquid colloid to form an electroplating loop; starting a direct-current power supply, and preparing an isomerous pure chromium plating layer by utilizing deposition; and hydrogen removal treatment is conducted on the deposited workpiece. According to the method, the heterogeneous pure chromium plating layer is prepared through deposition, chromium atoms are continuously deposited, a freely-growing chromium matrix is in a low-energy state, the defect density of grown chromium crystals is very low, meanwhile, chromium particles are consistent with the plating layer in component, have affinity and wettability with the chromium matrix, and can form colloidal suspension in a plating solution, so that the chromium particles are not prone to falling off. And the obtained heterogeneous pure chromium plating layer has relatively high wear resistance.