104 results about "Chromium coating" patented technology

The utility model discloses an anti-aging automobile wheel cover which comprises a wheel cover body, a lining is fixedly installed on the inner wall of the wheel cover body, chromium plating layers are arranged on the surfaces of the lining and the wheel cover body, the lining comprises a lining plate, a positioning piece is fixedly installed on the outer side of the lining plate, a positioning groove is formed in the inner wall of the wheel cover body, and the inner wall of the wheel cover body is provided with an anti-aging layer. The positioning grooves are matched with the positioning pieces in size, and meanwhile the positioning pieces are inserted into the positioning grooves. According to the anti-aging automobile wheel cover, when soil covering the surface of the inner wall of the wheel cover body needs to be cleaned, at the moment, screws between the wheel cover body and the lining are detached, and the lining is independently taken out for cleaning work; the interior of the wheel cover body and the lining are uniformly screwed and fixed through four groups of fixing bolts; when an automobile runs in a bumpy mode at a high speed, the lining and the wheel cover body cannot be separated, and accidents of potential safety hazards caused by the fact that the lining falls off when the automobile runs are eradicated.

The invention relates to a chromium coating zirconium alloy cladding tube sample for EBSD (electron back-scattered diffraction) testing and a preparation method and application of the chromium coating zirconium alloy cladding tube sample. The preparation method comprises the following steps: cutting and cleaning the chromium coating zirconium alloy cladding tube, embedding and fixing, grinding until the surface is smooth and free of burrs, mechanically polishing until the surface is free of scratches, finely polishing, pickling and cleaning to obtain a chromium coating zirconium alloy cladding tube sample. Compared with the prior art, the method has the advantages that the prepared chromium coating zirconium alloy cladding tube sample meets the EBSD test requirement, the characterization result can truly reflect the microstructure information of the chromium coating zirconium alloy cladding tube, and powerful support is provided for research and development of nuclear reactor accident fault-tolerant fuel cladding materials.

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.

The invention discloses a chromium coating based on V2O5 modification and a preparation method thereof. A used solid phase permeating agent comprises the following components: 30 to 50 percent of Cr, 2 to 7 percent of V2O5, 30 to 50 percent of SiC, 1 to 5 percent of NH4Cl, 5 to 5 percent of La2O3 and 2 to 5 percent of Y2O3. The prepared chromium coating is uniform in organization structure, moderate in thickness, sufficient in Cr atom diffusion, good in metallurgical bonding with a base body, suitable for austenitic steel and high-temperature alloy parts used for workpieces with large length-diameter ratios and various complex shapes such as large boilers and oil and gas field conveying pipelines, and excellent in industrial batch production benefit.

The invention discloses a high-temperature-resistant special high-frequency flexible cable and a preparation method thereof. Relates to the technical field of special high-frequency cables for high-end equipment manufacturing. The special high-frequency cable comprises a conductor, an insulating layer, an inner shielding layer, an outer shielding layer and a sheath layer which are sequentially arranged from inside to outside, the conductor is of a single-wire structure or a multi-wire stranded structure; a wire forming the conductor is composed of a copper wire core and a chromium plating layer or a chromium alloy plating layer plated outside the copper wire core. The insulating layer is of an extruded structure formed by foaming type modified polyimide materials outside the conductor; the inner shielding layer is an overlapped wrapping structure of a chromium-plated alloy temperature-resistant metal belt outside the insulating layer; and the outer shielding layer is a braided structure with silver-plated nickel-silicon alloy wires outside the inner shielding layer. The flexible cable has excellent electrical signal transmission stability, high temperature resistance and flexible bendability, can be effectively applied to aerospace working conditions, can be repeatedly used for a long time in the working conditions, and is safe and reliable.

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 utility model discloses an aerogel felt integrated composite aluminum veneer, which belongs to the technical field of aluminum veneers, and comprises an aluminum veneer body, the aluminum veneer body comprises an aluminum alloy panel main body, a chemical treatment layer and a chromium plating layer, the upper surface of the chromium plating layer is fixedly connected with an aerogel felt layer, and the aerogel felt layer is fixedly connected with the aluminum alloy panel main body. The upper surface of the aerogel felt layer is fixedly connected with a polyvinylidene fluoride resin layer, the upper surface of the polyvinylidene fluoride resin layer is fixedly connected with a fireproof layer, and the upper surface of the fireproof layer is fixedly connected with a silencing honeycomb layer; through the chromium plating layer, the aerogel felt layer, the polyvinylidene fluoride resin layer, the fireproof layer, the silencing honeycomb layer, the sound insulation plate layer and the anti-corrosion paint layer, the wear resistance, the corrosion resistance, the fire resistance, heat preservation and sound insulation functions of the aluminum veneer body can be improved, the use effect of the aluminum veneer is effectively improved, and through the reinforcing ribs, the mounting corner connectors and the mounting holes, the service life of the aluminum veneer is prolonged. The overall stability of the aluminum veneer can be improved, and installation work of the aluminum veneer body is facilitated.

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 invention discloses an anti-crack magnetron sputtering black chromium plating film layer structure. A chromium layer is additionally arranged in a chromium nitride layer of a magnetron sputtering black chromium plating film layer. The invention further discloses a surface crack improving method for the magnetron sputtering black chromium plating film layer. The surface crack improving method comprises the steps that 1, pretreatment is conducted; step 2, electrostatic dust collection; 3, prime coat spraying, wherein paint used for prime coat spraying comprises 97 parts by mass of basic metal UV prime coat paint, 2 parts by mass of 2-hydroxyethyl methacrylate phosphate and 1 part by mass of organic-inorganic hybrid polyurethane acrylic resin; 4, magnetron sputtering coating is conducted, specifically, a chromium target sputtering program is operated at first; then a chromium nitride sputtering program is operated; and step 5, spraying a top coat. The invention belongs to the technical field of physical vapor deposition, and solves the problems that in the prior art, the thermal expansion coefficient difference between a base material and a black chromium film layer is too large, an ultra-thin black chromium coating is difficult to resist thermal stress, and cracks are prone to occurring.

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 belongs to the technical field of nanotechnology, and particularly relates to a roughness-reduction-resistant and wear-resistant nano metal ceramic coating of an aluminum dam roller. The invention relates to a roughness-reduction-resistant and wear-resistant nano metal ceramic coating for an aluminum dam roller, which sequentially comprises a priming coat, a nickel-chromium coating, a bonding layer and a functional layer from inside to outside, wherein the nickel-chromium coating comprises 30-40% of nickel and 15-25% of chromium, and the bonding layer and the functional layer are nano tungsten carbide coatings. According to the wear-resistant nano metal ceramic coating provided by the invention, the roughness of the surface can be better maintained, and the friction coefficient of the surface of the dam roller is increased. And nano-scale tungsten carbide can be effectively coated on the surface of the dam roller.

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 roller with long service life in the technical field of textile equipment, which comprises a main body and a ceramic pipe sleeve, the ceramic pipe sleeve is clamped on the outer side wall of the main body, the outer side wall of the ceramic pipe sleeve is fixedly connected with an aluminum alloy reinforcing layer, the outer side wall of the aluminum alloy reinforcing layer is fixedly connected with a chromium-plated layer, and the chromium-plated layer is fixedly connected with the outer side wall of the ceramic pipe sleeve. Mounting grooves are formed in the left side wall and the right side wall of the main body, springs are fixedly connected to the bottoms and the tops of inner cavities of the mounting grooves, bolts are fixedly connected to the tail ends of the springs, push rods are fixedly connected to the left side wall and the right side wall of the bolts, and sliding grooves are formed in the left side wall and the right side wall of the inner cavities of the mounting grooves; according to the roller long in service life, the structural design is reasonable, the roller can be prevented from being abraded, the service life is prolonged, the whole roller does not need to be replaced during replacement, and cost is reduced.

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 present application relates to a composite-coated tinplate production process and tinplate, including S10, pretreatment: degreasing and pickling the steel substrate; S20, electroplating tin: electroplating tin on the steel substrate, and then rinsing to form a pure tin layer on the surface of the steel substrate; S30, electroplating chromium: electroplating chromium on the surface of the steel substrate that has completed step S20 and rinsing to form a chromium metal layer and a chromium hydrate oxide layer on the surface of the pure tin layer; S40, oiling: oiling the surface of the steel substrate that has completed step S30 to form an oil film layer. The tinplate production process and the tinplate formed by the process have a tin-chromium composite coating. Based on the excellent anti-corrosion performance of metallic chromium, the chrome-plated layer on the outer surface mainly plays an anti-corrosion role. At the same time, the tin in the inner layer has good welding performance and plays a role as a flux when welding is required, ensuring the welding quality during canning, so that the chrome-plated iron can also be used to make three-piece cans, and reducing costs.

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 an anti-erosive wear and anti-cavitation corrosion impeller with a nano metal ceramic coating, the impeller comprises an impeller body and the nano metal ceramic coating, the nano metal ceramic coating comprises a priming coat, a bonding layer and a metal ceramic layer which are sequentially coated from inside to outside, and the priming coat is coated on the impeller body. Wherein the bottom layer can be made of nickel-chromium coating, and the metal ceramic layer contains nano metal particles and nano ceramic particles. The erosive wear and cavitation corrosion resistant impeller with the nano metal ceramic coating has the advantages of cavitation corrosion resistance, wear resistance, seawater corrosion resistance and the like.