33 results about "Cobalt alloy" patented technology

The present invention relates to an alkaline composition for cleaning a substrate comprising i) copper or a copper alloy and ii) cobalt or a cobalt alloy, the composition comprising: a) at least one pH adjuster selected from compounds of formula I 【Chemical 1】 TIFF2026524618000015.tif3368(where Ra, Rb, Rd and Rf are each independently selected from unsubstituted linear or branched C1-C 12 alkyl, Re is selected from unsubstituted linear or branched C4-C9 alkyl; provided that the dashed bond between Re and N is a single bond or a double bond, and when the dashed bond is a double bond, Rd does not exist, Ra, Rb, Re and Rf are joined to form one or more 6-membered or 7-membered rings), b) at least one complexing agent selected from C2-C 12 hydrocarbons having at least two sulfonic acid groups or carboxylic acid groups, c) at least one polymeric dispersant having a mass average molecular weight of 1000 g / mol or more; and d) a solvent containing water and comprising.

This invention discloses a surface hardening method for universal joints in screw drills and related universal joints. The method includes: performing heat treatment and finishing on a rough-machined universal joint blank to obtain the universal joint body; after preheating the universal joint body, spot welding a tungsten-cobalt alloy block wrapped with nickel-based brazing filler metal to the wear-resistant contact surface at one end of the universal joint body; spraying nickel-tungsten carbide powder and nickel-coated boron carbide composite powder onto the wear-resistant contact surface to form a hardened layer on the wear-resistant contact surface; after cooling, grinding the sprayed surface to the design dimensions; inspecting the porosity of the ground sprayed surface, filling the porosity with nickel-tungsten carbide powder and nickel-coated boron carbide composite powder, heating and melting to seal the porosity; and after cooling, precision grinding the universal joint to the design dimensions. This invention greatly improves the wear resistance and impact fracture resistance of the universal joint, enabling it to be used in conjunction with other screw drill components resistant to 350℃ high temperatures to form screw drills resistant to 350℃ high temperatures.

This invention discloses a process and coating structure for rare earth modified trivalent chromium pearl chromium plating on zinc alloys. The process includes sequentially preparing a cyanide-free copper plating layer, a cyanide-free copper-zinc alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a pearl nickel plating layer, a rare earth modified trivalent chromium pearl chromium plating layer, and an anti-discoloration protective film on a zinc alloy substrate. The rare earth modified trivalent chromium pearl chromium plating process is as follows: chromium chloride hexahydrate 90-130 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 18-28 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additives 8-12 mL / L, leveling agent 2-4 mL / L, accelerator 1-3 mL / L, plating bath pH 2.5-3.2, plating bath temperature 25-35℃, and cathode current density 8-16 A / dm². The rare earth additives have a synergistic effect on improving the performance of trivalent chromium plating solution. No rust was observed on the surface of the plated parts after undergoing a neutral salt spray test for 132 hours according to GB / T 10125–2021 standard.

The application discloses a kind of recycling methods of waste ternary positive electrode material, belong to lithium battery recycling technical field.The recycling method of waste ternary positive electrode material of the application, comprising the following steps: raw material pretreatment, solvothermal reaction, extraction separation, purification nickel-cobalt alloy, lithium recovery.The recycling method of the application, by the pretreatment under specific pH system, solvothermal reaction and purification process, can the nickel-cobalt element in ternary material be directly converted into nickel-cobalt alloy single element, greatly reduce process flow, reduce material input and energy consumption, realize the efficient recovery of nickel-cobalt alloy and lithium carbonate.In addition, the mild alkaline medium can also avoid the serious corrosion problem caused by strong acid system to equipment, effectively reduce the initial investment and subsequent maintenance cost of equipment, so that the method becomes green recycling method with environmental friendliness and economic competitiveness.

A new MRAM memory cell and a manufacturing method therefor, which relate to the field of data storage. The method includes: sequentially including a reference layer, a magnesium oxide tunnel layer and a free layer in a stacking direction. The free layer sequentially includes an interfacial PMA free layer, a free spacer layer and a bulk PMA free layer in a stacking direction, wherein the interfacial PMA free layer is disposed on the surface of the magnesium oxide tunnel layer; the free spacer layer is configured to ferromagnetically couple the interfacial PMA free layer and the bulk PMA free layer; and the interfacial PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron alloy layer, and the bulk PMA free layer is a manganese-based ternary tetragonal alloy layer. In the present invention, an interfacial PMA free layer and a bulk PMA free layer are combined to provide a higher TMR. In addition, a new manganese-based ternary tetragonal alloy is also used as the bulk PMA free layer, which improves the process compatibility and also improves the data retention capability of a device.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

The application discloses a kind of tool surface treatment methods, belong to metal surface treatment technical field.The method sequentially includes: substrate pretreatment, plasma multi-element low-temperature co-diffusion forms gradient diffusion layer, magnetic field and ultrasonic synergic auxiliary pulse electrodeposition nanometer composite protective layer, laser selective remelting self-leveling and vacuum stress relief and cryogenic treatment;Gradient diffusion layer provides hardness gentle transition, and nanometer composite protective layer dispersively distributes nanometer silicon carbide particles and nanometer boron nitride particles with nickel, cobalt alloy as matrix.The method makes tool surface microhardness ≥1060HV0.1 under the premise of chromium-free environmental protection, bonding force ≥110N, friction coefficient ≤0.22, salt fog resistance ≥260h, and keeps precision size, and can completely replace traditional chrome plating process.

The application discloses a carbon-supported nickel-based core-shell catalyst and a preparation method thereof, wherein the core-shell catalyst supported on a carbon carrier comprises an inner core, an intermediate layer coated on the surface of the inner core, and an outer shell layer coated on the surface of the intermediate layer; the inner core comprises a nickel-cobalt alloy, the intermediate layer comprises a nickel-cobalt-molybdenum multi-metal oxide, and the outer shell layer comprises a molybdenum oxide. The application coats a porous molybdenum oxide outer shell layer on the surface of the intermediate layer, which not only does not affect the diffusion of reactants, but also effectively limits the oxidation of nickel into high-valence nickel oxide or hydroxide and limits the particle size of nickel-cobalt particles in the catalyst; during annealing reduction, the intermediate layer is gradually formed between the interface of the inner core and the outer shell layer, compared with single active sites of nano nickel, the intermediate layer provides a large number of reaction sites with high intrinsic activity, and therefore the core-shell structure not only guarantees the stability of the catalyst, but also has high catalytic activity.

The present application relates to a kind of real-time prediction method and system of nickel-cobalt alloy mechanical properties based on big data, comprising: multi-source in-situ big data acquisition, alloy composition data, big data preprocessing, mechanism-constrained hybrid prediction model construction, model training and optimization, real-time prediction and edge deployment, prediction result feedback and adaptive update etc., the real-time prediction system of nickel-cobalt alloy mechanical properties based on big data includes, acquisition module, processing module, calculation module, optimization module, prediction module and feedback module: the present application realizes the online real-time prediction of nickel-cobalt alloy mechanical properties, response time ≤100ms, without offline sampling, solve the pain point of traditional detection mode lag, destructive, can realize production process real-time quality control, reduce the batch production of unqualified products, reduce production cost, improve production efficiency.

The application relates to the field of data storage, in particular to a novel MRAM storage unit and a manufacturing method thereof, which comprises a reference layer, a magnesium-containing oxide tunnel layer and a free layer in sequence in a stacking direction; the free layer comprises an interface PMA free layer, a free spacer layer and a bulk PMA free layer in sequence in the stacking direction; the interface PMA free layer is arranged on the surface of the magnesium-containing oxide tunnel layer; the free spacer layer is used for ferromagnetic coupling of the interface PMA free layer and the bulk PMA free layer; the interface PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron-containing alloy layer; and the bulk PMA free layer is a ternary tetragonal alloy layer of manganese. The application combines the interface PMA free layer and the bulk PMA free layer, provides higher TMR, and further adopts a novel ternary tetragonal alloy of manganese as the bulk PMA free layer, improves process compatibility and improves the data retention capability of the device.

This invention relates to the field of printed circuit board manufacturing, and more specifically, to a method for manufacturing a printed circuit board integrating multiple surface treatments, and a printed circuit board thereof. The method includes: S100, manufacturing a multilayer board; S200, selectively exposing electroplated hard gold areas for the first time, and plating nickel and a gold-cobalt alloy to form a hard gold layer; S300, forming outer layer circuitry; S400, selectively exposing a thick gold plating area for the second time, and chemically plating nickel-gold to form a thick gold plating layer; S500, selectively exposing a nickel-palladium-gold plating area for the third time, and chemically plating nickel, palladium, and gold to form a nickel-palladium-gold layer; S600, forming and testing; S700, selectively exposing a silver plating area for the fourth time, and chemically plating silver to form a silver plating layer; S800, final inspection and shipment. Through four selective exposures, four surface treatments—electroplated hard gold, thick gold plating, nickel-palladium-gold plating, and silver plating—are systematically integrated onto the same printed circuit board, enabling it to simultaneously possess wear-resistant insertion and removal capabilities, gold wire bonding, fine-pitch soldering, and high-frequency signal transmission functions.

The application provides a SmCo / AlNiCo composite magnet and a preparation method thereof. The preparation method comprises the following steps: mixing SmCo alloy powder and AlNiCo powder with specific compositions, and then sequentially performing orientation setting and cold isostatic pressing treatment to obtain a SmCo / AlNiCo composite magnet green body; and sequentially performing vacuum sintering, solid solution treatment and aging treatment on the SmCo / AlNiCo composite magnet green body to obtain the SmCo / AlNiCo composite magnet. In the application, SmCo-containing raw materials and AlNiCo alloy raw materials with specific compositions are selected to prepare the SmCo alloy powder and the AlNiCo powder, and through the steps of mixing the two, sequentially performing orientation setting, cold isostatic pressing treatment, vacuum sintering, solid solution treatment and aging treatment and the like, the advantages of the SmCo magnet and the AlNiCo magnet can be fully utilized, and a composite magnet material with good magnetic performance at high temperature can be obtained.

A method of creating one or more metal interconnects in an electronic device, wherein the electronic device comprises one or more features within which the one or more metal interconnects are created, the method comprising the steps of (a) depositing a copper layer on the one or more features; (b) depositing a rhenium-cobalt alloy layer on the copper layer; and (c) depositing a tin or tin alloy layer on the rhenium-cobalt alloy layer; wherein the rhenium-cobalt alloy layer comprises greater than 50 wt. % rhenium.

This utility model discloses a non-destructive testing device for large aluminum-nickel-cobalt alloy castings, belonging to the field of non-destructive testing equipment technology. It includes a gantry frame with an internal testing mechanism for omnidirectional testing of components. The testing mechanism includes a rotating unit and a lifting unit. The rotating unit, located inside the gantry frame, includes a top plate fixedly installed at the top of the gantry frame. A motor drives a pinion gear to mesh with a large gear, causing a rotating shaft and connecting column to rotate, allowing the scanning testing component to rotate horizontally around the casting. Simultaneously, the lifting unit, driven by a motor, drives a worm gear to mesh with a worm wheel, causing the rotating column and gear to rotate, thereby controlling the rack to move vertically within a rectangular hole, achieving the lifting and adjustment of the scanning probe. The two working together allow the scanning probe to cover different heights and circumferential areas of the casting, eliminating the need for hoisting and flipping large castings, significantly reducing testing costs and safety risks.

This invention belongs to the field of sodium-ion batteries, specifically relating to the negative electrode sheet, preparation method, and battery of a negative electrodeless sodium battery. The negative electrode sheet includes a composite current collector and a stacked gradient alloy layer. The composite current collector includes a polymer layer and a stacked metal layer, with the metal layer in direct contact with the gradient alloy layer. From the side in contact with the metal layer to the side away from the metal layer, the content of the first alloy composed of titanium-tungsten alloy, nickel-cobalt alloy, or titanium-zirconium alloy decreases linearly, while the content of the second alloy composed of titanium-bismuth alloy, titanium-tin alloy, or titanium-zinc alloy increases linearly. The content of the first alloy on the side in contact with the metal layer is 80wt%~100wt%, and the content of the second alloy on the side away from the metal layer is 60wt%~80wt%. The mass ratio of the two metals in the first alloy is (6~8):(2~4), and the mass ratio of the two metals in the second alloy is (7~9):(1~3). The battery has high energy density, high cycle capacity retention, high rate performance, and low short-circuit risk.

A method of creating one or more metal interconnects in an electronic device, wherein the electronic device comprises one or more features within which the one or more metal interconnects are created, the method comprising the steps of (a) depositing a copper layer on the one or more features; (b) depositing a rhenium-cobalt alloy layer on the copper layer; and (c) depositing a tin or tin alloy layer on the rhenium-cobalt alloy layer; wherein the rhenium-cobalt alloy layer comprises greater than 50 wt.% rhenium.

A bionic bucket body is of a shell-imitated streamline double-layer hollow titanium alloy structure, a three-dimensional driving rod capable of being folded and twisted according to the paper folding principle is carried, the surface of the bionic bucket body is coated with a seawater corrosion resistant coating, and a telescopic water-resisting layer is arranged in the bionic bucket body to achieve sample pressure maintaining; the bionic self-locking ground breaking structure is composed of piranha tooth shape-imitated tungsten cobalt alloy ground breaking teeth, tooth blades are provided with bionic anti-drag lines and can be quickly disassembled and assembled through replaceable clamping grooves, and the integrity of the blade edges is strengthened by the inter-tooth self-locking structure; the mechanical metamaterial sensing system is embedded into a negative Poisson's ratio piezoelectric metamaterial sensor array, so that multi-dimensional mechanical load, static and dynamic pressure and spatial attitude can be monitored in real time, and accurate feedback is provided for excavation adjustment. Bionic design and an intelligent sensing technology are fused, the adaptability, excavation efficiency and sample collection quality of the deep-sea high-pressure strong-corrosion environment are improved, maintenance is convenient, and the problems that traditional equipment is large in cut-in resistance, lack of state sensing, poor in adaptability and the like are solved.

The purpose of the present invention is to efficiently produce a valuable-metal-containing alloy, while suppressing excessive energy consumption, from a raw material including a waste battery material that contains iron, lithium, a rare earth element, nickel, and cobalt.　The present invention is a method for producing an alloy of nickel and cobalt from a raw material including a waste battery material that contains nickel and cobalt, the method comprising: a preparation step for preparing a raw material including a waste battery material that contains at least iron, lithium, a rare earth element, nickel, and cobalt; a reduction melting step for subjecting the raw material to a reduction melting treatment to obtain a reduced product that contains slag and a nickel-cobalt alloy; and a slag separation step for separating the slag from the reduced product and recovering the nickel-cobalt alloy. In the preparation step, the mass ratio of Li to the rare earth element in the raw material is 0.3 or greater, and in the reduction melting step, the rare earth element content of the resulting slag is 0.3-11 mass%.

The application relates to the technical field of spin electronic devices, and discloses a spin electronic device for visible light interface magnetic regulation, a preparation method of the spin electronic device and electronic equipment. The spin electronic device comprises a substrate, a bottom electrode located above the substrate, a magnetic layer located above the bottom electrode, which can change an in-plane ferromagnetic resonance field of the magnetic layer under the action of an exciton, the magnetic layer is an aluminum-doped cobalt alloy, an active layer located above the magnetic layer, which can generate an exciton under the action of visible light, and a top electrode located above the active layer. Through the synergistic effect of the magnetic layer and the active layer, the in-plane ferromagnetic resonance field of the visible light interface can be regulated, the injection efficiency of photo-generated electrons into the magnetic layer is improved, the regulation range of the light-controlled magnetism is expanded, and the spin electronic device has the beneficial effects of simple structure and easy realization.

A device and method for selective reduction and stepwise smelting of limonite laterite nickel ore to produce nickel-cobalt alloy and molten iron belong to the field of mineral processing and metallurgical technology. The device includes a silo, a screw feeder, a multi-stage cyclone preheating and drying system, a flue gas dust removal system, a fluidized bed roasting main furnace heating system, a first cyclone separator, a fluidized bed reduction reactor, a second cyclone separator, a first electric furnace smelting reactor, and a second electric furnace smelting reactor. The method steps are as follows: limonite laterite nickel ore is placed in the silo; it is fed into the multi-stage cyclone preheating and drying system, preheated, and then enters the roasting main furnace for heating, dehydration, and decomposition to form dried material; after gas-solid separation, the solid material enters the reduction reactor, and the high-temperature flue gas is returned to the system for preheating and drying; nitrogen and reducing gas are introduced into the inlet of the reduction reactor respectively, forming reduced material that flows out from the outlet; the solid material after gas-solid separation enters the smelting reactor, and excess gas is burned for heating; the iron-rich slag is melted and reduced, and then discharged after smelting.

A hydrogen evolution catalyst for acidic seawater electrolysis based on a platinum-cobalt alloy / carbon nanotube composite structure and its preparation method are disclosed, belonging to the field of nanomaterials and catalysis technology. The catalyst consists of a platinum-cobalt alloy / carbon nanotube composite layer supported on a porous conductive substrate, with a platinum-cobalt metal solid solution uniformly anchored on the surface of acidified carbon nanotubes. The method involves mixing platinum acetylacetonate, cobalt acetylacetonate, and acidified carbon nanotubes, followed by solvent-free microwave pyrolysis under an argon atmosphere to obtain a platinum-cobalt alloy / carbon nanotube composite powder in one step. This powder is then drop-coated onto a porous conductive substrate and electrochemically activated to obtain an integral composite electrode catalyst. This invention enables precise control of the catalyst structure and composition; it features low noble metal loading, a simple and environmentally friendly preparation process; and effectively overcomes the problems of easy deactivation and insufficient stability of traditional platinum-based catalysts in acidic media. It exhibits excellent hydrogen evolution activity and long-term stability under high-temperature, high-current-density electrolysis conditions in acidic seawater.

The application relates to the technical field of semiconductor materials, and particularly discloses a high-purity copper-nickel-cobalt alloy target material for semiconductors and a preparation process thereof. The preparation process of the high-purity copper-nickel-cobalt alloy target material for semiconductors comprises the following steps: independently deep-purifying Cu, Ni and Co; atomizing and powdering high-purity Cu, high-purity Ni and high-purity Co respectively; applying a pulse magnetic field at 400-500 DEG C to perform orientation treatment; switching the pulse magnetic field to a direct-current magnetic field after the orientation treatment, and meanwhile performing discharge plasma sintering; and performing stress relief annealing on the sintered compact after cooling. The application independently deep-purifies each element, atomizes and powderizes and mechanically alloyizes to obtain pre-alloy powder, rapidly densifies through discharge plasma sintering, in-situ fixes an orientation structure, maintains a magnetic field in a cooling process to prevent orientation relaxation, and finally obtains a target material with fine-grained structure and strong <111> texture synergy.

This invention relates to the field of additive manufacturing metal materials technology, specifically disclosing a low-cracking-prone, low-expansion-cobalt-based iron-nickel-cobalt alloy powder and its preparation method. This alloy optimizes the composition of traditional expansion alloys. Its key technology lies in the synergistic addition of trace amounts of rare earth elements lanthanum (La) and boron (B), while strictly limiting the content of copper (Cu), to suppress the formation of low-melting-point phases and reduce grain boundary oxide segregation, thereby significantly improving the alloy's resistance to thermal cracking during high-rate, high-energy-beam additive manufacturing. Compared with existing technologies, the alloy powder provided by this invention enables the additive manufacturing of high-density, low-defect, high-performance expansion alloy components.

The application discloses an iron-cobalt alloy used as a metal catalyst and a preparation method thereof, relates to the technical field of alloy materials, and comprises the following steps: configuring pure iron and pure cobalt raw materials according to proportions, and preparing electrode structural members through welding; the electrode and an ingot head are loaded into a vacuum electron beam melting and ingot drawing furnace, and vacuumizing is performed; first electron beam melting and ingot drawing is performed under the vacuum condition to form an iron-cobalt ingot; second electron beam melting and ingot drawing is performed on the first melted ingot to further purify and homogenize; and the final iron-cobalt ingot is cut and subjected to chemical component detection. The iron and cobalt contents in the iron-cobalt alloy are set in a specific proportion range, so that the alloy has a relatively narrow solid-liquid phase temperature difference and good fluidity while maintaining a suitable melting point; the component design can maintain a face-centered cubic structure under diamond synthesis conditions, and has a relatively high lattice matching degree, which is beneficial to reducing interface energy and promoting carbon atom diffusion and diamond nucleation.

The application discloses a device and method for detecting internal defects of tungsten-cobalt hard alloy blanks, and relates to the technical field of alloy detection. The device comprises a test shell, an upper end of the test shell is provided with a transmission cavity, two first conveying rods and second conveying rods that are parallel and have different rotating speeds are arranged in the transmission cavity, transmission threads are distributed on the first conveying rods and the second conveying rods, and a transmission gap matched with the tungsten-cobalt alloy rod is formed between the two conveying rods. A multi-point detection assembly for detecting the surface of the tungsten-cobalt alloy rod, a feeding assembly for intermittently providing the tungsten-cobalt alloy rod, a spraying assembly for spraying detection liquid, and a discharging assembly for collecting qualified products and unqualified products are arranged on the test shell. The driving assembly drives the two conveying rods to rotate asynchronously, so that the tungsten-cobalt alloy rod continuously tumbles while advancing in the transmission gap. The device realizes automatic feeding, transmission, spraying, detection and sorting of the tungsten-cobalt hard alloy blanks, significantly improves the detection efficiency and accuracy, and reduces the labor intensity.

The application discloses a kind of micro comb tooth structure diamond grinding wheel with abrasive positive rake angle and the preparation method of obtained diamond grinding wheel, comprising the following steps: step 1, the circumferential surface of grinding wheel matrix is prepared by precise milling and is formed in a certain array of groove with ordered arrangement, and diamond abrasive is directionally bonded in groove using conductive glue;Mechanical consolidation of abrasive is realized by depositing nickel-cobalt alloy through pulse plating method;Step 2, the grinding wheel obtained in step 1 is shaped by pulse laser system, and effective control of grinding wheel outer circle runout is realized;Step 3, the abrasive positive rake angle of grinding wheel obtained in step 2 is formed;Step 4, micro comb tooth structure processing is carried out on the grinding wheel in step 3.

The present application relates to the field of printed circuit board manufacturing, more particularly, to a printed circuit board manufacturing method integrating multiple surface treatments and a printed circuit board. The method comprises: S100, manufacturing a multi-layer board; S200, exposing a electroplated hard gold area through a first selective exposure, plating nickel and gold-cobalt alloy to form a hard gold layer; S300, forming an outer layer circuit; S400, exposing a thick gold plating area through a second selective exposure, chemically plating nickel and gold to form a thick gold plating layer; S500, exposing a nickel-palladium-gold plating area through a third selective exposure, chemically plating nickel, palladium and gold to form a nickel-palladium-gold plating layer; S600, forming and testing; S700, exposing a silver plating area through a fourth selective exposure, chemically plating silver to form a silver plating layer; S800, final inspection and delivery. Through four selective exposures, the electroplated hard gold, thick gold plating, nickel-palladium-gold plating and silver plating are sequentially integrated on the same printed circuit board, so that the printed circuit board has the functions of wear-resistant plugging, gold wire bonding, fine pitch soldering and high-frequency signal transmission.

This invention discloses a magnesium alloy gold plating process and coating structure using a trivalent chromium plating layer as an intermediate coating. The process includes sequentially preparing a chemical zinc plating layer, a cyanide-free copper plating layer, a bright nickel-copper alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a trivalent chromium plating layer, a gold plating layer, and a rare-earth electrolytic protective film on a magnesium alloy substrate. The trivalent chromium plating layer is prepared using a rare-earth modified trivalent chromium plating process. The gold plating layer is prepared using an acidic gold plating process: 780–820 mL / L of BALILOY 300 FC MU bath starter, 18–22 mL / L of BALILOY CO cobalt salt, 3.6–3.8 g / L of gold salt, pH 3.6–4.0, plating bath temperature 30–40℃, and cathode current density 0.4–0.8 A / dm³. 2 The cathode moved at a speed of 4–6 m / min. The adhesion of the plating was tested using the thermal shock method according to GB / T 5270–2024, and the adhesion met the standard requirements. The plating underwent a neutral salt spray test for 420 h according to GB / T 10125–2021, and no rust was found on the surface.

The application discloses a method for converting heavy aromatic hydrocarbons into light aromatic hydrocarbons, and the method comprises the following steps: contacting heavy aromatic hydrocarbons and toluene with a catalyst under heavy aromatic hydrocarbon lightening reaction conditions, wherein the active component of the catalyst is a nickel-cobalt alloy, and the carrier of the catalyst is ZrO2 modified USY molecular sieve. The catalyst used in the application exhibits good conversion rate, mixed xylene selectivity and anti-coking performance in heavy aromatic hydrocarbon lightening. The alloy formation of Ni and Co can improve the anti-coking performance of the catalyst, and improve the conversion rate and mixed xylene selectivity. The ZrO2 modified USY molecular sieve has a large specific surface area and mesopore volume. The ZrO2 modified USY molecular sieve as the carrier can improve the dispersity and stability of the nickel-cobalt alloy, and improve the anti-sintering performance of the catalyst, so that the catalyst exhibits good catalytic activity, stability and anti-coking performance.

This invention discloses a rare earth modified trivalent chromium plating process and coating structure for magnesium alloys. The process includes sequentially preparing a chemical zinc plating layer, a cyanide-free copper plating layer, a cyanide-free copper-tin alloy plating layer, a bright nickel-copper alloy plating layer, a bright nickel-cobalt alloy plating layer, a rare earth modified trivalent chromium plating layer, and an anti-discoloration protective film on a magnesium alloy substrate. The rare earth-modified trivalent chromium plating process is as follows: 80-140 g / L chromium chloride hexahydrate, 90-160 g / L potassium chloride, 90-160 g / L ammonium chloride, 16-30 g / L ammonium bromide, 40-60 g / L ammonium formate, 45-65 g / L boric acid, 8-12 mL / L rare earth additives, 2-4 mL / L leveling agent, 1-3 mL / L accelerator, pH of the plating solution 2.5-3.2, plating tank temperature 25-35℃, cathode current density 8-16 A / dm², using an inert graphite rod as the anode, and moderate air agitation. The rare earth additives have a synergistic effect on improving the performance of the trivalent chromium plating solution. The plated parts undergo a neutral salt spray test for 140 hours according to GB / T 10125–2021, and no surface corrosion is observed.