17results about How to "Reduce corrosion rate" patented technology

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

This utility model discloses a dust collection device for busbar cutting, comprising: a support member, a magnetic suction member, and a collection assembly; the support member has a through hole, and the support member is sleeved on the busbar through the through hole; the support member has an annular groove surrounding the busbar and opening towards the end of the busbar; the magnetic suction member is installed on the support member located on the back of the annular groove, magnetically attracting dust into the annular groove; the collection assembly is installed below the support member and communicates with the annular groove. This reduces the splashing of iron filings and dust, improves safety, and provides a certain degree of protection for the surrounding environment and personnel. It also reduces the penetration of iron filings and dust deep into the busbar, lowers the difficulty of cleaning, and reduces labor intensity. Furthermore, it prevents splashed iron filings from damaging the busbar, maintaining a good appearance for the busbar, reducing the rate of corrosion caused by impurities, and extending its service life.

This utility model discloses a portable desalination device for metallic artifacts, belonging to the field of cultural relic protection technology. It includes a mobile frame with casters fixed to the bottom via spring shock absorbers. A desalination assembly is located on the top of the frame, comprising a desalination chamber, a lid, partition grooves, partition plates, threaded grooves, several connecting rods, and clamps. The desalination assembly, with its cross-shaped partition grooves and snap-fit ​​partition plates within the desalination chamber, allows for flexible adjustment of the internal space dimensions, adapting to metallic artifacts of different sizes and volumes, significantly improving the device's adaptability. Furthermore, the connecting rods mounted via the threaded grooves flexibly secure the clamps and a waterproof camera. The monitoring sensor probe within the clamps can acquire multi-dimensional data at different depths of the solution in real time, while the waterproof camera simultaneously records the artifact's condition, eliminating reliance on manual sampling and enriching parameter monitoring methods.

This invention relates to a modular, anti-siltation bottom aquaculture device. The device includes an aquaculture module and an anti-siltation module. The aquaculture module has a cubic frame structure, within which several shellfish aquaculture cages or ropes are installed. The anti-siltation module includes several flip-up plates spaced apart on the lower plane of the cubic frame structure of the aquaculture module. This invention can be customized to suit the seabed characteristics of different sea areas, and each device is an independent aquaculture space, facilitating processing, transportation, assembly, and deployment. It is highly practical and effectively reduces labor and transportation costs. The anti-siltation module has a simple structure and can freely switch between deployment and harvesting states, effectively solving the siltation problem in bottom aquaculture. To increase service life, an anti-corrosion module can be added, fixing sacrificial anodes to the aquaculture module. This invention significantly reduces aquaculture costs and enables large-scale, green, and ecological shellfish aquaculture in bottom sea areas, demonstrating strong applicability and economic viability.

This invention discloses a low-voltage, high-current electrolytic hydrogen production power supply system and control method based on a SiC and IGBT hybrid half-bridge, belonging to the field of electrolytic hydrogen production technology. The system includes: a hybrid half-bridge power module, used to convert the bus voltage into the total system output voltage and output IGBT branch current and SiC branch current under the control of a drive signal; a drive and isolation module, connected between the digital control and sampling module and the hybrid half-bridge power module, used to generate a drive signal based on a PWM signal and send the drive signal to the hybrid half-bridge power module; and a digital control and sampling module, used to sample key state variables of the system, calculate the PWM signal based on the key state variables, and send the PWM signal to the drive and isolation module. This invention compensates for the ripple of the low-frequency IGBT branch in real time through the high-frequency SiC branch, avoiding the problem of temporary ripple increase in traditional hybrid topologies during transients.

This application relates to the field of etching solution technology, specifically disclosing a BOE etching solution and its preparation method. The BOE etching solution comprises the following raw materials: hydrofluoric acid, ammonium fluoride, a metal corrosion inhibitor, a composite buffer regulator, perfluorobutyl polyoxyethylene ether, and ultrapure water; the metal corrosion inhibitor is a complex of benzotriazole-imidazolium-grafted polyethyleneimine and aminotrimethylenephosphonic acid; the composite buffer regulator includes ammonium hydrogen fluoride, boric acid, and amino acids. The BOE etching solution of this application can be used in back-end metal wiring processes such as integrated circuits, MEMS devices, and 3D NAND, and is particularly suitable for etching silicon dioxide containing tungsten, aluminum, and titanium metals. It features high etching rate, low metal corrosion, and excellent metal surface protection, effectively solving the technical pain points of existing BOE etching solutions, such as severe metal corrosion and difficulty in simultaneously achieving etching and protection.

The application relates to the technical field of graphene, and discloses a fluorinated graphene modified polytetrafluoroethylene composite material and a preparation method, the composite material comprising: polytetrafluoroethylene as a base; fluorinated graphene uniformly dispersed in the base; and the following additives, the total content of the additives being 1% to 10% of the total weight of the composite material: nano silicon dioxide, carbon nanotubes, glass fibers, long-chain alkyl amine; the tensile strength of the composite material of the application is increased by at least 20% compared with pure PTFE, the elongation at break of the composite material is increased by at least 15% compared with pure PTFE, and through the use of specific solvents (dimethyl sulfoxide or water) and ultrasonic treatment, the uniform dispersion of the fluorinated graphene and other additives in the PTFE base is ensured, the agglomeration phenomenon is reduced, and the compactness and mechanical properties of the composite material are improved.

This utility model relates to the field of lower chord pipe technology and discloses a lower chord pipe fixing device, including a lower chord pipe fixing frame. The top of the lower chord pipe fixing frame is fixedly connected to a first steel cable ring, and a fixing steel wire is movably sleeved inside the first steel cable ring. A drainage slot is opened at the top of the lower chord pipe fixing frame, and a lower chord pipe fixing ring is fixedly connected to the bottom of the drainage slot. The lower chord pipe is movably sleeved inside the lower chord pipe fixing ring, and a fixing connecting frame is fixedly connected to the top of the lower chord pipe fixing frame. This utility model uses a drainage slot opened on the outside of the fixing frame at an inclined angle of 15° to quickly drain rainwater or condensate accumulated at the top, preventing water stains from forming liquid at the connection between the fixing frame and the lower chord pipe. This reduces the corrosion rate of metal parts, ensures the long-term stable fitting accuracy of the lower chord pipe fixing ring and the lower chord pipe, avoids loosening or jamming caused by corrosion, and further ensures the structural reliability of the equipment.

This application relates to a corrosion inhibitor and its preparation method for circulating water in coastal high-chlorine environments of steel plants, belonging to the technical field of circulating water treatment and corrosion inhibitors. The chemical composition of the corrosion inhibitor, by mass fraction, includes: imidazoline corrosion inhibitor: 20%~23%, azole corrosion inhibitor: 15%~18%, surfactant: 7%~10%, halogen promoter: 1%~3%, zinc salt: 1%~3%, biomass-based scale inhibitor: 1%~5%, bactericide: 1%~5%, defoamer ≤3%, and water: 30%~54%. Through the synergistic effect of its components, the corrosion inhibitor can form a dense and stable composite protective film on the carbon steel surface, effectively blocking the electrochemical corrosion of the steel matrix by chloride ions in a high-chlorine environment, and maintaining structural stability at high temperatures. This corrosion inhibitor also possesses excellent scale inhibition performance and environmental friendliness. The preparation process of the corrosion inhibitor is simple and cost-controllable, which can significantly extend the service life of key equipment in the circulating water system of steel plants in coastal high-chlorine environments, reduce maintenance costs, and ensure long-term stable operation of the system.

This invention belongs to the field of marine pipeline welding technology and discloses a method for welding galvanized sleeves. This method involves prefabricating and welding a first pipe body and a first sleeve, as well as a second pipe body and a second sleeve, and then galvanizing the entire assembly. The galvanized layer is not damaged by the high-temperature welding. The double-sided prefabrication and welding of the stainless steel sleeve and carbon steel pipe before galvanizing ensures that the inner ends of the first and second pipe bodies are sealed with welds after closure. This prevents the flowing medium from easily entering the surrounding gaps. The sealed inner ends and the galvanized layer significantly improve resistance to corrosion, extending service life and reducing corrosion rate. While achieving high welding efficiency, this indirectly extends the service life of related equipment. Furthermore, during pre-assembly in the ship section stages, the connecting sleeve and the second sleeve are appropriately recessed into their respective sections to prevent contact and collision during the closure and hoisting of the ship sections, thus improving the construction efficiency of the ship section closure and hoisting.

This invention relates to a double-gate parallel sealing gate valve, comprising a valve body and a sealing cylinder fixedly installed on its top. The extended end of the sealing cylinder movably penetrates the valve body and is fixedly mounted with a connecting seat. A first gate and a second gate are respectively fixedly mounted at both ends of the connecting seat. The input end of the valve body is fixedly connected to a water inlet pipe, which is located away from the second gate. The output end of the valve body is provided with a rust-preventing mechanism for drying the second gate. After the gate valve is closed and the sewage in the outer shell and drain pipe is emptied, the cylinder is controlled to separate the sealing cover from the second vent hole. The blocking rod is pulled out from the first vent hole, and at the same time, the L-shaped blower pipe is moved downward so that its output end faces the second gate. After the blower is turned on, the airflow is blown out from the output end of the L-shaped blower pipe, which, together with the first and second vent holes, discharges the humid air, slowing down the corrosion rate of the second gate surface and extending the service life of the gate valve.

This invention discloses a magnesium-aluminum alloy for seat brackets, its preparation method, a seat bracket, and a vehicle, belonging to the field of automotive technology. Based on the total weight of the magnesium-aluminum alloy, its chemical composition, calculated by mass percentage, includes: aluminum: 2.5%-4.0%; zinc: 2.0%-3.5%; tin: 0.8%-1.5%; calcium: 0.3%-0.6%; cerium: 0.05%-0.2%; manganese: 0.2%-0.4%; with the remainder being magnesium and unavoidable impurities. By controlling the aluminum content to a low range, the coarse, brittle network phase β−Mg is suppressed at its source. 17 Al 12 The introduced calcium element preferentially reacts to form the Al2Ca phase, thereby maximally suppressing the formation of β−Mg. 17 Al 12 The formation of the phase, along with the introduction of tin, results in the formation of the high-hardness Mg2Sn phase with magnesium, which serves as the main precipitation strengthening phase. Trace amounts of cerium act as a synergistic phase morphology regulator, influencing the morphology of the Al2Ca and Mg2Sn phases during solidification and pinning them to the grain boundaries. Through this multi-phase regulation, the alloy achieves high strength while avoiding the toughness loss caused by the presence of a large number of brittle phases in traditional magnesium alloys.

This invention discloses a low-corrosion high-temperature energy storage molten salt and its method. The molten salt composition includes 20%~30% potassium chloride, 20%~30% sodium chloride, 1%~5% aluminum powder, 1%~5% magnesium powder, 1%~5% zinc powder, and the remainder is magnesium chloride. This invention discloses a low-corrosion high-temperature energy storage molten salt with high stability, low corrosivity, a simple preparation process, and ease of large-scale production. It can achieve excellent thermal storage performance at 600℃~800℃ with low corrosivity, has a large latent heat of phase change, high energy utilization rate, and low requirements for the material grade of metal load-bearing components such as tanks and pipelines, which can significantly reduce the cost of solar thermal engine composite materials.

The present application belongs to zinc-nickel alloy plating layer, and particularly relates to an alkaline stripping solution for removing unqualified zinc-nickel alloy plating layer, a preparation method and application thereof. In order to safely and efficiently remove unqualified zinc-nickel alloy plating layer, the present application provides an alkaline stripping solution, which is composed of the following components in terms of mass concentration: main salt: NaOH 100-180 g / L; oxidizing agent: sodium nitrate 180-200 g / L and NaClO 10-20 g / L; complexing agent: salicylaldehyde oxime 30-50 g / L and diethylene triamine 30-50 g / L; corrosion inhibitor: 2-acetylpyrrole or 4-piperidine carboxamide 2-10 g / L; wetting agent: sodium dodecyl sulfate 0.5-1.5 g / L. After the components in the alkaline stripping solution are mixed in proportion, the alkaline stripping solution can be directly used for removing unqualified zinc-nickel alloy plating layer, the stripping rate reaches 0.6-1 um / min, and the stripping temperature range is wide without damaging the substrate.

This application relates to a composite anti-corrosion device for geothermal well casing, belonging to the field of geothermal development equipment technology. It includes a tool body with a small hole at one end. An electrode is inserted into the small hole, with one end of the electrode located inside the hole and the other end extending out of the hole. The small hole is filled with an electrolyte solution, and an isolation component is provided between the electrode and the electrolyte solution. This application reduces wellbore damage and decrease in water production caused by casing corrosion in geothermal wells.

The application discloses a bleaching device and bleaching method for concentrated nitric acid production and belongs to the technical field of concentrated nitric acid production.The bleaching device comprises a nitric acid concentration tower, a magnesium nitrate heater, a concentrated nitric acid condenser, a gas-liquid separator and a bleaching tower, the nitric acid concentration tower is connected with the concentrated nitric acid condenser and the magnesium nitrate heater respectively, the concentrated nitric acid condenser is connected with the gas-liquid separator, and the gas-liquid separator is connected with the bleaching tower.The application reduces system resistance and improves system negative pressure stability;the empty tower speed of the bleaching tower is increased, one bleaching tower can be used by multiple sub-systems, the process flow is shortened, the investment and maintenance cost are reduced, the nitrate content in the dilute magnesium nitrate solution is simultaneously reduced to below 0.05%, the corrosion rate of the dilute magnesium nitrate heater is reduced, and the service life is prolonged.

The invention belongs to the technical field of carbon steel surface modification and corrosion protection, and particularly relates to a preparation method of carbon steel surface high-corrosion-resistance electroplated copper. In order to solve the problems that an existing cyanide-free copper plating process is poor in activation, a matrix is prone to damage, and the plating layer binding force and corrosion resistance are insufficient, the four-step process of matrix pretreatment, anode electrolytic activation, cyanide-free citric acid system electrochemical copper plating and high-temperature curing is adopted, and sodium nitrate and sodium chloride mixed electrolyte is used for low-current-density mild activation; and in cooperation with a copper plating solution with specific components and curing at 132-148 DEG C, a plating layer is compact and free of holes, and interface bonding is tight. The method has the advantages of being environmentally friendly, non-toxic, simple and controllable in technological process and the like, the thickness of the obtained copper plating layer is 15-30 microns, the corrosion resistance of the obtained copper plating layer in an alkaline environment is improved by 1.6-3.0 times compared with a traditional copper plating layer, the corrosion rate of the obtained copper plating layer in an alkaline medium is smaller than or equal to 0.06 mm / year, and the corrosion resistance of the obtained copper plating layer is remarkably improved compared with a traditional technology.