526 results about "Surface oxidation" patented technology

The invention provides a method for automatically measuring the thickness of an oxide layer on the surface of an aluminum profile, and the method comprises the steps: scanning a hanging tool contact region on the surface of the aluminum profile, obtaining an aluminum profile surface image, carrying out the edge contour recognition of the aluminum profile surface image, determining the coordinate position of a hanging tool contact point, and obtaining a contact point region range; dynamically adjusting a measurement probe avoidance path according to the boundary coordinates of the uncertain measurement area, generating a measurement track bypassing the uncertain measurement area, and determining a compensation measurement point position sequence according to the boundary of the effective measurement area and the uncertain measurement area; the measuring probe is guided to execute thickness scanning in the effective measuring area through the compensation measuring point position sequence, the oxide layer thickness value of each measuring point is obtained through scanning, and an oxide layer thickness data set is formed; and generating a final oxide layer thickness evaluation report according to the corrected thickness value and the effective measurement area range, and fusing the boundary coordinates of the uncertain measurement area and the oxide layer thickness distribution characteristics to determine the surface oxide layer thickness of the aluminum profile.

The invention discloses an injection molding aluminum alloy feed and a preparation process thereof, the feed is composed of aluminum alloy powder and a compound binder, and the aluminum alloy powder is composed of Si, Fe, Cu, Mn, Mg, Zn, Cr, Ti, Co and Al; according to the technical scheme, aiming at the technical problems that a brittle phase is easy to form due to high magnesium and silicon content of the 6013 aluminum alloy, the interface bonding force is poor, the sintering shrinkage is difficult to control and the like due to a stable surface oxide film, and through collaborative optimization of a formula and a process, the high-magnesium-silicon-content high-magnesium-silicon-content high-brittleness aluminum alloy is obtained; the feeding and finished product performance is obviously improved; and the prepared aluminum alloy part has the advantages of high sintering density, high hardness, high tensile strength, high elongation and the like, and can meet the manufacturing requirements of high-end fields such as aerospace and traffic transportation on complex precision parts.

The invention relates to the technical field of industrial visual inspection, and particularly discloses a cable copper wire surface oxidation defect online detection system, which is characterized in that multispectral pixel blocks on the surface of a copper wire are extracted through multispectral imaging and image segmentation; using a lightweight convolutional neural network to extract deep spectral-spatial features to obtain an initial feature vector; decomposing the initial feature vector into a defect essential feature component and an environment related feature component which are independent from each other by adopting a feature decoupler; applying a composite loss function including classification loss, decoupling loss and orthogonal constraint loss in the training stage for joint optimization; in the inference stage, classification decision is carried out only according to the intrinsic characteristic components of the defects, and a sorting mechanism is linked to execute rejection operation.

This invention provides a method for producing small-diameter, thick-walled near-α-type titanium alloy tubing and its application. This method, through the use of cladding and heated rolling, increases the deformation per rolling pass, reduces the number of rolling passes, and results in a finer microstructure and better mechanical properties in the heated-rolled tubing. Simultaneously, the composite material composed of the cladding layer and silica aerogel effectively prevents the alloy rod from contacting air, avoiding further surface oxidation and reducing the thickness of the oxide layer on the rod surface. Furthermore, the composite material forms a "thermal insulation layer" on the surface of the alloy rod, preventing large temperature differences between the surface and core during heated rolling, thus ensuring better microstructure uniformity and surface quality. In this invention, the cladding process expands the selection of heating furnaces and reduces equipment requirements.

The invention discloses a chemically enhanced shear thickening polishing solution suitable for a WC-Co alloy and a polishing method, and aims to solve the problem of loss of a Co phase on the surface of the WC-Co alloy in a traditional polishing method. The polishing solution comprises K3 [Fe (CN) 6], KOH, diamond abrasive particles, dispersed phase particles and deionized water, a WC phase and a Co phase of a WC-Co alloy react with [Fe (CN) 6] 3 <-> and OH <-> in the polishing solution respectively, and a soft oxidation film WO3-x and a stable Co3O4 oxidation film are generated on the surface of the alloy. Through the shear thickening effect, the polishing solution forms a particle cluster wrapping the abrasive particles when the relative speed reaches a threshold value, a surface oxidation film is removed through the micro-cutting effect of the diamond abrasive particles, and efficient, high-quality and Co-loss-free WC-Co alloy surface polishing is achieved. The method obviously inhibits the loss of the Co phase at the same time, maintains the hardness and the use performance of the alloy surface, and is especially suitable for precision machining of the hard alloy blade.

The invention discloses a method for reducing impurity element sulfur in cast high-temperature alloy return scraps, and belongs to the technical field of metal material smelting. The method comprises the following steps: carrying out vacuum induction melting on pretreated cast high-temperature alloy return scraps of the same mark to obtain a return scrap alloy induction ingot; surface oxide skin of the obtained return scrap alloy induction ingot is removed, a primary shrinkage cavity in the upper end is cut off, then the return scrap alloy induction ingot and an auxiliary electrode are coaxially welded, and a consumable electrode is obtained; and after the consumable electrode is baked, electroslag remelting is conducted under the protective atmosphere, and an electroslag ingot is obtained. On the basis of vacuum induction melting, the protective atmosphere electroslag remelting technology is further adopted for conducting deep purification melting treatment on the return scrap alloy ingot, the content of the impurity element S in the return scrap alloy ingot can be reduced to 0.5 ppm or below, and the content of the impurity element S in the return scrap alloy ingot reaches the level lower than the content of the element S in a new material; and the high-temperature oxidation resistance and corrosion resistance of the alloy can be obviously improved, and the fatigue, durability and other mechanical properties of the alloy are improved.

The application belongs to the field of metallurgy and relates to a preparation method of titanium alloy wire, in particular to a bright surface cold drawing preparation method of high-strength titanium alloy wire.The titanium alloy wire is subjected to vacuum heat treatment and surface lubricating treatment, then subjected to multi-group multi-pass bright surface cold drawing process, and finally subjected to surface treatment to obtain titanium alloy wire with target diameter.By controlling pass deformation of 8-20% and heat deformation of 30-50%, the titanium alloy wire is subjected to full-process bright surface cold drawing from φ3.0mm to φ0.2mm, and the drawing speed reaches 15-35m / min.The titanium alloy wire prepared has good metallographic structure, high uniformity, and a yield of more than 80%.For the fine wire from φ0.5mm to φ0.2mm, the bright surface drawing reduces the frequency of the problem that the wire is prone to breakage due to the depression on the surface of the wire caused by the oxide skin on the surface of the wire.

The invention discloses a preparation method of a corrosion-resistant and impact-resistant high manganese steel wear-resistant lining plate, and relates to the technical field of wear-resistant materials, the preparation method comprises the following steps: S1, weighing raw materials according to the mass percentage; s2, raw material smelting; s3, rare earth purification is conducted, specifically, rare earth elements are added into the molten-state raw materials, and the molten-state raw materials are subjected to deoxidation and desulfurization treatment; s4, casting molding is conducted, the temperature from the bottom end of a casting to a riser is controlled to be decreased stage by stage, and directional solidification is achieved; s5, heat treatment is conducted, specifically, the casting is subjected to solution treatment and then subjected to water quenching to the room temperature; and S6, surface treatment is conducted, specifically, shot blasting treatment is adopted, surface oxide skin is removed, and a surface compressive stress layer is formed. The strength, hardness and high toughness of the high-manganese steel are guaranteed by controlling the content of carbon and manganese, meanwhile, single-phase austenite is obtained through solution treatment, the hardness is improved through carbon atom segregation through low-temperature aging, and the strength, hardness, toughness and corrosion resistance of the high-manganese steel lining plate are improved.

The invention discloses a preparation method of a TiAl alloy casting containing return scraps, the TiAl alloy return scraps used in the preparation method are casting sprues, patches and skull which are cut off in subsequent processing, and the preparation method comprises the following specific implementation steps: carrying out ultrasonic cleaning and surface treatment on the return scraps to remove a surface oxide layer; a new material with the target weight of 50% is used for smelting during primary smelting to obtain a primary ingot, a return material is placed below the turned primary ingot before secondary smelting, and then the primary ingot is smelted and poured into a preheated mold to form a casting, so that recycling of a TiAl alloy raw material is realized, the raw material cost is reduced by 50%, the preparation cost is reduced by 33%, and the production efficiency is improved. And the power consumption and the equipment loss are reduced, so that the purposes of energy conservation and emission reduction are achieved. The impurity element control of the cast ingot produced by the method is equivalent to that of alloy produced by conventional raw materials, and is convenient and fast compared with a preparation process by directly utilizing the raw materials. And the poured casting is uniform in component, compact in structure and high in purity.

The invention relates to the field of solar cell manufacturing, and particularly discloses a polishing additive for solving the black core problem in the BC cell pre-rough polishing process and a use method of the polishing additive. 0.1-5% of a defoaming agent; 0.1 to 0.5 percent of pH (Potential of Hydrogen) regulator; and the balance of deionized water. According to the method, the accelerant, the defoaming agent and the pH regulator in a specific ratio are combined, so that the oxidation reaction on the surface of the silicon wafer is more uniform and controllable; the accelerant accelerates formation and dissolution of a surface oxide layer, and generation of black cores is effectively avoided; the synergistic effect of the defoaming agent ensures that bubbles generated by the reaction can be quickly desorbed, the problem of uneven local corrosion caused by bubble retention is prevented, the surface of the polished silicon wafer is completely free of black nuclei, and ideal surface conditions are provided for subsequent processes.

The invention relates to a low-cost high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 6-11% of Al, 0.4-0.6% of Zn, 0.2-0.6% of Mn, 0.2-0.4% of Y, 0.2-0.6% of Ca and the balance of Mg and inevitable impurities. A small amount of Ca and Y elements are added, on one hand, an alpha-Mg matrix structure can be refined, beta phase distribution is more uniform, and the mechanical property is improved; and on the other hand, the solid solubility of the alloy element Y in an alpha-Mg matrix can be improved by adding the Ca element, the compactness of a surface oxidation film and a corrosion product film is promoted, compared with other rare earth elements, the potential difference between Al-Ca and Al-Y phases formed by Ca, Y and Al and the magnesium matrix is smaller, micro galvanic corrosion is smaller, and the corrosion resistance of the alloy is remarkably improved.

The invention provides a production method and application of a small-diameter thick-wall near-alpha type titanium alloy pipe. According to the method, the deformation of rolling passes can be increased and the number of times of rolling can be reduced by adopting coating strip temperature rolling, and the strip temperature rolled pipe is fully refined in structure and better in mechanical property. Meanwhile, a multi-layer material composed of the coating layer and the silicon dioxide aerogel can effectively prevent the alloy bar from making contact with air, further surface oxidation is avoided, and the thickness of an oxidation layer on the surface of the bar is reduced. In addition, a heat preservation layer can be formed on the surface of the alloy bar through the multi-layer material, large temperature difference cracking of the surface and the core of the bar is avoided during rolling with temperature, and therefore it is guaranteed that the structure uniformity of the bar is better, and the surface quality is better. In the invention, after the alloy bar is coated, the selection of a heating furnace is expanded, and the use requirement of equipment is reduced.

The invention discloses conductive silicon nitride composite ceramic and a preparation method and application thereof. The method for preparing the conductive silicon nitride composite ceramic comprises the following steps: performing surface oxidation treatment on first ceramic powder to obtain the first ceramic powder with an oxidation film layer; mixing the second ceramic powder with the first ceramic powder with the oxide film to obtain a mixture; carrying out heating treatment on the mixture under the condition of 1700 DEG C to 2500 DEG C so as to obtain a precursor; and sintering the precursor to obtain the conductive silicon nitride composite ceramic, wherein the first ceramic powder comprises alpha-Si3N4, the second ceramic powder comprises metal oxide ceramic, the oxidation film layer comprises silicon oxide, and the oxidation film layer has active sites; the volume conductivity of the conductive silicon nitride composite ceramic at room temperature is not lower than 1 * 10 < 2 > S / m, and the volume conductivity of the conductive silicon nitride composite ceramic at 1000 DEG C is not lower than 1 * 10 < 3 > S / m. The conductive silicon nitride composite ceramic prepared by the invention has excellent mechanical properties and high conductivity.

The invention relates to a preparation method of a high-hardness composite coating on a titanium alloy surface, which comprises the following steps: pretreating a titanium alloy base material to remove a surface oxide layer to obtain the treated titanium alloy base material; prepared high-entropy alloy powder is dried and evenly laid on the surface of the treated titanium alloy base material, and the titanium alloy base material with the powder laid is obtained; performing laser cladding treatment on the titanium alloy base material subjected to powder laying in a protective gas atmosphere to obtain a high-entropy alloy strengthened coating; the particle size of the powder is controlled to be 65-90 microns. The Al powder, the Co powder, the Ni powder, the Ti powder and the B powder with the purity higher than 99.5 wt% are selected as raw materials, the high-entropy alloy powder and the high-strength titanium alloy matrix are molten on the surface of the high-strength titanium alloy through a laser high-energy heat source, the metallurgical bonding effect is achieved, high-entropy phase strengthening is achieved, grains can be fine, and the hardness and abrasion resistance of a surface coating can be improved. The surface hardness of the coating prepared by laser cladding of the high-entropy alloy powder on the surface of the titanium alloy is not lower than 677 HV, and the wear resistance is not lower than 1.128 hmm.

The invention discloses a near-net forming friction welding method for a dissimilar metal stud based on a middle layer, which comprises the following steps of: pre-processing a similar T-shaped boss with a thread or a circular truncated cone-shaped boss without a thread section on the end surface of a workpiece with high hardness, and pre-processing a corresponding similar T-shaped groove or a circular truncated cone-shaped groove on the end surface of a workpiece with low hardness; and before welding, middle-layer alloy is placed at the upper end and the bottom of the T-like groove or the bottom of the circular-truncated-cone-shaped groove, and the welding steps comprise rotary pressing, rotary pressing and friction, sudden stop and upsetting. The intermediate layer alloy is used as a medium, direct contact friction of a welded workpiece is avoided, surface oxidation films of adjacent base metal are broken and gaps are filled through severe plastic deformation of the intermediate layer under rotary extrusion of the workpiece, and effective welding under the conditions of low upsetting friction pressure and no obvious deformation of the workpiece is achieved. And a dissimilar metal welding interface is prevented from being overheated to generate an overthick intermetallic compound, subsequent machining is omitted, near-net forming of a friction welding joint is achieved, and the production efficiency is improved.

The invention belongs to the field of vanadium-aluminum alloy smelting. The invention discloses a preparation method of a high-density low-defect vanadium-aluminum alloy. The method comprises the following steps: crushing raw materials; drying the raw materials; aluminum is prepared according to the amount of residual aluminum in the alloy accounting for 106%-108% of the theoretical amount of aluminum participating in the oxidation-reduction reaction, and the dried raw materials are evenly mixed; the mixed materials are put into a smelting furnace, and the composite flux is flatly laid on the materials; tiling titanium powder on the composite flux; igniting the titanium powder to carry out thermit reaction on the furnace charge in the furnace; gradient extreme cooling is conducted on the alloy, and sequential solidification from bottom to top is achieved at the temperature gradient of 50-100 DEG C / h; and after solidification, disassembling the furnace, carrying out water quenching, and cooling to obtain the vanadium-aluminum alloy. According to the method, the problems of surface oxidation, internal cracking, bottom loosening and the like of the vanadium-aluminum alloy can be synchronously solved, and the compactness and quality of the vanadium-aluminum alloy are remarkably improved.

The invention discloses an ultrasonic vibration auxiliary milling method for a Ti2AlNb material, and belongs to the technical field of alloy material machining. The method comprises the following steps: removing a surface oxide layer from a Ti2AlNb material piece; the Ti2AlNb material piece is subjected to longitudinal-torsional composite ultrasonic vibration auxiliary milling machining; wherein the longitudinal-torsional composite ultrasonic vibration is used for assisting milling, and the vibration parameters of the longitudinal-torsional composite ultrasonic vibration are as follows: the torsional vibration tangential line amplitude is 4-8 microns, the ultrasonic frequency is 20-30 kHz, the longitudinal vibration amplitude is 3-6 microns, and the phase difference is 90 degrees. According to the method, the Ti2AlNb material piece with the machining surface small in roughness value and large in residual compressive stress value is finally obtained, harmful tensile stress of the machining surface obtained through pure milling machining is converted into compressive stress, generation of microcracks can be effectively restrained, and the service life of the material is prolonged.

The invention relates to the technical field of oxidation treatment of powder metallurgy products, and discloses a surface oxidation treatment device for high-airtightness powder metallurgy products, which comprises a pretreatment mechanism, one end of the pretreatment mechanism is fixedly connected with a steam treatment furnace, and a conveying mechanism is mounted between the pretreatment mechanism and the steam treatment furnace; a powder metallurgy product assembly is conveyed on the conveying mechanism; the pretreatment mechanism comprises a first machine body, an outer shell, a ventilation shell, a vacuum assembly and a first steam assembly, the outer shell is connected to the upper side of the first machine body, and the ventilation shell is fixedly connected to the inner side of the outer shell. According to the active pretreatment method, the closed cavity is vacuumized firstly to form negative pressure, then low-temperature steam is injected, and the steam is forcibly and rapidly permeated into all the deep holes of the powder metallurgy product through the pressure difference. The problem of non-uniform permeation caused by obstruction of residual air in pores in traditional direct steam treatment is fundamentally solved.

The invention discloses an organic-inorganic multi-layer composite coating material with functions of promoting cell adhesion, resisting infection and promoting osteogenesis and a preparation method of the organic-inorganic multi-layer composite coating material. The method specifically comprises the following steps: 1) carrying out primary sand blasting treatment on a titanium / titanium alloy sample, then removing an oxide layer on the surface of the titanium / titanium alloy sample by using an ultrasonic oil removal and glow discharge cleaning process, and constructing a copper / zinc alloy coating on the surface of the sample by combining an electrochemical deposition process; 2) carrying out micro-nano processing on the coating by using a secondary sand blasting process to introduce a topological morphology; (3) depositing a polydopamine PDA coating on the surface by using an in-situ auto-polymerization process, and simultaneously dipping to complete the chelation of Fe < 3 + > and PDA; 4) further utilizing an ultrasonic impregnation process to realize conversion from PDA-Fe < 3 + > chelation to PDA-Fe < 3 + >-salvianolic acid b chelation so as to introduce a salvianolic acid b layer, and washing, air-drying and sterilizing to obtain the material. The material has multiple cell adhesion promotion, infection resistance and multiple osteogenesis promotion functions, and can realize innovation of coating technologies in the fields of orthopedics, dentistry and the like.

The invention discloses a surface cleaning method for a large complex magnesium alloy structural part formed through electric arc additive manufacturing, and belongs to the field of post-treatment of formed structural parts after electric arc additive manufacturing. The method comprises the following steps that a mechanical arm is adopted to drive a special wire brush to conduct preliminary mechanical cleaning, and flexible contact is achieved through a mechanical sensor and a floating clamp; acidic cleaning liquid is sprayed to the surface of the workpiece through an ultrasonic spraying system, the surface color change is monitored in real time through a high-speed camera so as to control the reaction endpoint, and flushing and drying are conducted in time; and finally, carrying out fine cleaning under the protection of argon by adopting large-light-spot laser with low power density, and monitoring in real time through a spectrograph to ensure the cleaning effect. According to the method, the oxide layer and the pollutants on the surface of the large complex component can be efficiently, losslessly and automatically removed, the problem that the magnesium alloy WAAM component is difficult to clean due to high chemical activity and complex structure is solved, and the whole process is environmentally friendly and controllable.

To provide improved surgical instruments. [Solution] Surface preparation of sliding surfaces can improve the wear performance of surgical instruments such as surgical staplers, which include a reusable mechanism that is used multiple times with a single-use reloadable cartridge. A combination of surface hardening, surface finishing, and surface coating can be applied to the metal components of surgical instruments to reduce the possibility of abrasive wear in metal-to-metal sliding engagements. Surface hardening technology can enable further manufacturing operations such as welding without compromising the strength of the underlying metal substrate. With stainless steel metal substrates, surface hardening or surface hardening technology may reduce corrosion resistance, so a surface coating can be added to suppress surface oxidation and to provide a barrier against metal-to-metal contact. Further lubricating coating layers, such as a brazing coating layer, can enhance abrasion resistance.

The invention discloses a composite spraying film material for heat dissipation of an air conditioner outdoor unit. The composite spraying film material comprises a first complexing agent and a second complexing agent, according to the air compressor, the first complexing agent and the second complexing agent are cooperatively matched, the first complexing agent can form a rough material layer on the surface of the air compressor to serve as a bottom film layer, the rough surface is composed of countless randomly-distributed tiny concave-convex structures, the effective radiation area is increased through the concave-convex structures, and then the radiation efficiency is effectively improved; furthermore, a surface film layer is formed on the bottom film layer through a second complexing agent, the surface film layer is coated on the concave-convex structures in the bottom film layer, so that the radiation heat dissipation of each concave-convex structure in each direction is further improved, and the surface film layer and the bottom film layer jointly assist the heat dissipation of the surface oxide layer of the air compressor. The heat generated by working of the air compressor can be quickly dissipated, so that the temperature of the air compressor is kept in the optimal working temperature range, and finally, the refrigerating or heating effect can be close to the preset temperature.

The utility model relates to the technical field of copper strip oxidation treatment, in particular to a special-shaped copper strip surface oxide skin treatment device. Comprising a working box body, a control panel is arranged on one side wall of the working box body, a liquid storage box is arranged in the working box body, a timer is arranged on the surface of one side of a supporting panel, a limiting sliding groove is formed in the surface of one side of the supporting panel, a threaded rod is arranged in the limiting sliding groove, and a movable sliding block is arranged in the limiting sliding groove. A ceramic placing box is arranged above the working box body, a honeycomb ceramic filter plate is embedded into the bottom of the ceramic placing box, a driving motor is arranged at the top of a supporting panel, two groups of movable sliding grooves are formed in the bottom end of the interior of the working box body, and two groups of movable sliding strips are arranged at the bottom end of a liquid storage box. According to the embodiment, the surface treatment quality of the copper strip is improved while the rust remover or the acid solution is prevented from being over-reacted with the copper strip.

The invention discloses a high-temperature alloy turbine blade directional solidification method based on multistage dynamic gas protection control. The high-temperature alloy turbine blade directional solidification method comprises the following steps that a high-temperature alloy mother alloy material is put into a crucible; filling inert gas to a preset pressure, heating the crucible, heating to a preset temperature, and keeping the temperature to ensure that the alloy liquid is liquefied; continuously filling inert gas to preset pressure and then refining, wherein a vibration generator generates a magnetic field in the refining process to carry out electromagnetic vibration on the alloy liquid; continuously filling inert gas to preset pressure, and then transferring the crucible; inert gas is continuously filled to preset pressure, then the crucible is tilted, pouring is conducted, and in the pouring process, a gas purging device sprays the inert gas to conduct purging protection on the alloy liquid; and continuously filling inert gas to preset pressure, and pulling the shell to finish the directional solidification process. The method can reduce the gas content in the melt, prevent the melt from being oxidized, promote the removal of a surface oxidation film, reduce pores and oxidation film inclusion, and improve the purity, mechanical properties and yield of the casting.

The invention discloses an aluminum profile surface oxidation treatment process, and relates to the technical field of aluminum profile surface treatment.The aluminum profile surface oxidation treatment process comprises the steps that an aluminum profile is sequentially subjected to organic solvent degreasing, alkali washing and acid pickling bright dipping, and deionized water cleaning is conducted after each step of operation; taking the pretreated aluminum profile as an anode, placing the aluminum profile in an electrolyte, and carrying out anodic oxidation treatment to obtain a nano-porous aluminum oxide film loaded with functional components; the preparation method comprises the following steps: immersing a nano porous alumina film loaded with functional components into a hole sealing liquid, carrying out permeation crosslinking, realizing directional arrangement of functional groups in a weak electric field, and finally, carrying out oven curing to obtain the intelligent response type multifunctional composite oxide film. The hole sealing liquid contains a difunctional organosilane hole sealing agent. According to the prepared composite oxide film, the hardness and wear resistance of the aluminum profile are remarkably improved, the intelligent characteristics of light response self-cleaning and pH response antibacterial are given to the aluminum profile, the composite oxide film can adapt to complex and changeable application environments, the service life is prolonged, and the maintenance cost is reduced.

The invention discloses an electrochemical denucleation decommissioning facility oxide layer method based on a synergistic acidic electrolyte, and relates to the technical field of cleaning. The method comprises the following steps: by taking a polluted metal component as an anode and an inert electrode as a cathode, immersing the polluted metal component into a synergistic acidic electrolyte of a low-concentration acidic medium, and stripping an oxide layer on the surface of the polluted metal component until a clear grain boundary is exposed at the temperature of lower than 40 DEG C in a high-voltage direct-current electrolysis mode. By developing a synergistic enhanced acidic electrolyte system, high decontamination rate is realized in a low-concentration sulfuric acid medium, radionuclide stripping is accurately controlled to avoid matrix pitting corrosion damage, and high-valence nuclides in a compact oxide layer are deeply removed, so that the decontamination efficiency is improved. Finally, an efficient, low-damage and stable-process radioactive contamination metal treatment scheme is provided for nuclear facility decommissioning engineering. The method is suitable for removing radioactive contamination oxidation layers on the surfaces of the inner walls of stainless steel pipelines and reactor containers in nuclear facility decommissioning projects, and radionuclides are enriched in the oxidation layers.

The utility model discloses a cleaning device for oxidizing slag on the surface of an anvil of a forging machine. The cleaning device comprises a lifting rotating module, a swing arm, a blowing cleaning plate and a driving part, the swing arm is connected with the output end of the lifting rotating module so as to move in the vertical direction and rotate in the horizontal plane around a fulcrum. The blowing and cleaning plate is rotationally mounted at the end part of the swing arm, has a parallel state and an overlapped state with the swing arm, and is used for cleaning the surface of the anvil tool and storing the blowing and cleaning plate respectively; and the driving piece is arranged on the swing arm, is connected with the purging cleaning plate and is used for controlling the purging cleaning plate to be switched between a parallel state and an overlapped state. Through the arrangement, manual cleaning is replaced, the purpose of improving the cleaning efficiency is achieved, and the application requirements of large-scale and continuous production can be effectively met while the safety coefficient is improved.

The application discloses a nickel-plated steel strip lead processing method and belongs to the technical field of metal material surface treatment. The method aims to solve the problems of poor plating layer adhesion, large internal stress and easy peeling of the existing nickel-plated steel strip lead. The process steps include: S1, steel strip oil removal treatment; S2, composite activation treatment: the oil-removed steel strip is immersed in a composite activation solution containing sodium citrate to remove the surface oxide layer and form an active adsorption film; S3, nickel plating: the activated steel strip is immersed in a sulfate plating solution containing saccharin and 1,4-butynediol as composite additives for electroplating to form a low-stress and high-density nickel plating layer; S4, post-treatment: cleaning and drying; S5, slitting and packaging. The application cooperates sodium citrate activation with a plating solution system containing stress relieving agents, significantly improves the adhesion between the substrate and the plating layer, reduces the internal stress of the plating layer, and the obtained product has no peeling and falling of the plating layer after repeated bending, low porosity and excellent comprehensive performance, and is particularly suitable for the manufacturing of high-performance electronic component leads.

The application discloses a kind of high-power high-speed direct modulation quantum dot laser and preparation method thereof, N-type GaAs substrate is sent into MBE chamber to remove the surface oxidation layer, N-type GaAs contact layer is sequentially grown on the N-type GaAs substrate of surface oxidation layer removal, N-type AlGaAs restriction layer, first undoped GaAs waveguide layer, multilayer quantum dot active region, second undoped GaAs waveguide layer, P-type AlGaAs restriction layer, P-type GaAs contact layer, to obtain high-power high-speed direct modulation quantum dot laser from this. The method greatly improves the number of quantum dot layers by precisely controlling the growth conditions of quantum dots and the thickness of the spacer layer, while controlling the thickness of the quantum dot active region, thereby increasing the differential gain of quantum dots, carrier injection efficiency and greatly improving the direct modulation rate and light output power of quantum dot laser.

The invention discloses a SiC wafer surface oxidation behavior simulation method, system and device, and relates to the technical field of molecular dynamics simulation, and the method comprises the following steps: initializing a plurality of roughness related parameters in MATLAB, and setting simulation box sizes of a Si surface initial model and a C surface initial model; reading atomic positions in the Si surface initial model and the C surface initial model; circulation is carried out on different roughness related parameters, and a corresponding rough surface is generated in each circulation; cutting atomic positions based on different rough surfaces to obtain a plurality of Si surface roughness models and C surface roughness models, and inputting the Si surface roughness models and the C surface roughness models to LAMMPS; and performing OH deposition on the Si surface roughness models and the C surface roughness models in the LAMMPS, and simulating the surface oxidation process. According to the method, by introducing the random roughness, the rough morphology of the SiC surface is accurately simulated, and the authenticity and practicability of research are remarkably improved.