23 results about "Anodic dissolution" patented technology

The invention discloses a circuit board wastewater heavy metal removal method and system, and the method comprises the steps: monitoring the concentration and valence distribution of heavy metal ions in circuit board wastewater in real time, and generating wastewater heavy metal form distribution characteristics in combination with oxidation-reduction potential and pH value; based on wastewater heavy metal form distribution characteristics, adjusting an oxidation-reduction environment to generate heavy metal ion enriched wastewater; the method comprises the following steps: introducing heavy metal ion enriched wastewater into an electric flocculation reactor, applying a periodic electric field through a programmable pulse power supply to dissolve an aluminum or iron anode to release a multi-core hydroxyl complex, and carrying out a co-precipitation reaction with heavy metal ions to generate a flocculating constituent suspension; and introducing the flocculating constituent suspension into a rotational flow clarification and separation device, realizing mud-water separation through centrifugal sedimentation and inclined plate separation, outputting supernate, discharging the supernate after reaching the standard, and recovering precipitated sludge rich in heavy metals. By utilizing the embodiment of the invention, efficient breaking and separation of the complex-state heavy metals can be realized, and good environmental benefits and resource values are achieved.

A near-atomic-scale electrolytic machining method based on an interface self-assembly biomask comprises the steps that firstly, hydroxylation pretreatment is conducted on the surface of an anode of a workpiece, then the surface of the anode is covered with an organic solvent phase containing phospholipid monomers, water-phase electrolyte drops are introduced, molecular self-assembly driving force at an oil-water-metal three-phase interface is utilized, and the surface of the anode of the workpiece is subjected to near-atomic-scale electrochemical machining. And rapidly forming a layer of ultrathin, continuous and stable support phospholipid bilayer mask on the surface of the workpiece in situ. Then, biological nanochannels are embedded in the biomimetic mask to construct a confinement ion transport path. And finally, a precise pulse electric field is applied, electrolyte ions are driven to be strictly limited in the nanometer channel and transmitted to the surface of the workpiece, local anodic dissolution is triggered, and therefore localized material removal of the nanometer scale or even the near-atomic scale is achieved. According to the method, the technical bottleneck that the high-quality phospholipid bilayer is difficult to prepare on the high-surface-energy metal surface is solved, and a new way is provided for ultra-precision electrolytic machining.

The application discloses a copper electrolysis / electricity deposition device and a working method thereof in the technical field of crude copper electrolytic refining, which comprises a tank body, the tank body comprises a cathode cavity and an anode cavity, the cathode cavity and the anode cavity are arranged side by side and are communicated with each other, an electrolyte input device, the electrolyte input device is arranged in the cathode cavity, and the electrolyte input direction is from the cathode to the anode, an electrolyte output device, the electrolyte output device is arranged in the anode cavity, and the electrolyte output direction is from the anode to the cathode, cathode plates and anode plates can be arranged in the cathode cavity and the anode cavity respectively at intervals, and the cathode plates and the anode plates are connected with an electrolysis power source externally, the cathode cavity and the anode cavity adopt a cathode-anode different-tank structure, the purity of electrolyte in the cathode tank is high during the electrolysis process, the quality of cathode copper can be improved, the problem of short circuit caused by excessive dissolution of the anode plates and falling off of the anode plates during the electrolysis process can be avoided, the residual anode rate can be reduced, and silver ions generated by anode dissolution do not participate in cathode discharge, so that the silver recovery rate can be improved.

This invention relates to the field of laser processing technology and discloses a laser cutting process and apparatus for thick-walled tubes combined with electrochemical jet slag removal. The process includes: an automatic buffer material feeding and recovery mechanism pushes a high-temperature resistant ceramic-based inner liner tube into the inner cavity of a thick-walled tube as a buffer material for laser cutting; after cutting, the buffer material is removed, a physical sliding isolation sealing door is closed in conjunction with a flexible clearance pad, and a positive pressure air curtain blowing device is activated to seal the processing area; the thick-walled tube is connected to the anode of a power source, and the inner and outer jet nozzles are connected to the cathode, spraying high-pressure sodium nitrate passivation electrolyte into the residual slag area. The slag removal mechanism, which combines physical shielding at the slag source with electrochemical anodic dissolution and high-pressure liquid flow flushing, eliminates the contact stress caused by mechanical hard cutting and avoids the problem of micro-cracks at the tube wall wear ports; a spatial isolation protection mechanism prevents salt spray from eroding the optical lenses of the fiber laser cutting head and the machine tool transmission guide, completing a non-destructive slag removal operation.

The invention discloses an ion channel protein near-atomic scale confinement dissolution electrochemical machining method based on a bionic confinement interface. The method is characterized in that a bionic phospholipid bilayer mask is spread on a workpiece anode to shield a non-processing area, ion channel protein is embedded into the bionic phospholipid bilayer mask to serve as an electrolyte channel, and when the bionic phospholipid bilayer mask is powered on, the anode dissolution reaction is strictly limited in the ion channel protein channel. Millivolt-level picosecond-nanosecond pulse voltage or current is adopted on the time scale so that anode metal atoms can be removed one by one, electrolytic products are discharged in the modes of electrolyte adjustment, microcosmic acting force, micro vibration and the like so as to ensure sustainable generation of electrochemical reaction, and therefore near-atomic-scale electrolytic machining is achieved. The electrochemical machining technology and the biological field are fused in an interdisciplinary mode, the near-atomic-scale electrochemical dissolution reaction space is constructed, the capacity of electrochemical machining for removing materials in an ion form is approached, and near-atomic-scale electrochemical machining is achieved.

The invention particularly relates to a preparation method and device of high-purity copper with a rotary electrode, and belongs to the technical field of new material preparation. The device comprises at least one electrolysis unit, and the electrolysis unit is provided with a first electrode, a rotatable second electrode and a third electrode. The first electrode and the second electrode form an electrodeposition area, and the second electrode and the third electrode form an electrolysis area. According to the method, gradient voltage is applied to three electrodes, so that copper-containing electrolyte is firstly deposited on the surface of a rotating second electrode in an electrodeposition area for the first time; and then, the second electrode rotates to the electrolysis area, deposited copper on the surface of the second electrode serves as an anode to be dissolved, and secondary electrodeposition occurs on the third electrode. The lead anode impurity pollution can be effectively avoided from the source, and the technological process is simple, efficient, low in cost and suitable for large-scale production.

The application discloses a method for preparing a titanium carbon oxide electrode by coating, and the method comprises the following steps: A. crushing and screening titanium carbon oxide, mixing the titanium carbon oxide with a pore-forming agent and a binder to obtain a mixture, and adding water into the mixture to prepare a slurry; B. coating the slurry on a graphite substrate by using a doctor blade; and C. drying and sintering the coated graphite substrate to obtain the titanium carbon oxide electrode. The application provides a method for preparing a titanium carbon oxide electrode by coating, the titanium carbon oxide electrode is prepared by coating and sintering the mixed slurry on a graphite substrate, the peeling problem of the electrode caused by gas scouring in an electrolysis process is avoided, the loose and porous structure formed by sintering makes the electrode have relatively high dissolving performance, the anode dissolving rate is increased from 50% to more than 80%, and the problem of low dissolving rate of the titanium carbon oxide anode in the electrode process is solved.

The invention belongs to the field of energy and metallurgy. Specifically, the invention discloses an electrolytic iron system based on multi-energy coupling and a surface topography multi-scale control method. A nano-micro-scale special surface microstructure is constructed on the cathode seed plate through a combined process of laser engraving, sand blasting treatment, anodic dissolution and photovoltaic current pre-coating. And meanwhile, magnetic field ultrasonic microwave multi-physical field enhanced ore phase reconstruction, acidolysis, anodic dissolution, photovoltaic current pre-coating, iron electrolysis and other procedures are adopted, and the reaction performance is improved. In the multi-scale control process of the surface appearance of the electrolytic iron, a multi-energy coupled clean energy supply system is adopted. According to the method, the non-uniform deposition problems such as cracking, blackening and dendritic crystals in the iron electrolysis process can be remarkably inhibited, and the current efficiency and the production stability are improved. The method is suitable for surface morphology regulation and control of pure iron prepared through large-scale continuous iron ore electrolysis, and has the advantages of being high in efficiency, low in energy consumption, free of pollution, ultralow in carbon dioxide emission and the like.

This disclosure provides a method for preparing a pre-grown film on the surface of a Zr-Ti-Ta alloy and the Zr-Ti-Ta alloy itself, relating to the field of alloy material preparation technology. The method includes: weighing composite Zr source powder, Ti powder, and Ta powder, and using them as raw materials for intermittent mechanical alloying; sequentially performing degassing and dehydrogenation, diffusion homogenization, and densification hot-pressing sintering; subjecting the α+β transition structure Zr-Ti-Ta alloy to phase stabilization heat treatment, cross-hot rolling, and recrystallization annealing; determining that the fine-grained single α-phase Zr-Ti-Ta alloy is within a constant potential pre-grown film window in the target medium; using the fine-grained single α-phase Zr-Ti-Ta alloy as a working electrode, immersing the working electrode in the target medium, defining the true potential of the working electrode relative to the reference electrode with a reference electrode, and ensuring that the true potential is within the constant potential pre-grown film window; and generating a dense barrier-type nanocomposite oxide pre-grown film containing ZrO2, TiO2, and Ta2O5 in situ on the surface of the fine-grained single α-phase Zr-Ti-Ta alloy. This disclosure can suppress localized anodic dissolution at crack tips and improve resistance to stress corrosion cracking.

A method for the anodic dissolution of nickel and cobalt metals in acids from recycled lithium ion batteries to their corresponding metal salts is disclosed. The anodic dissolution system comprises an anode and cathode compartment separated by an anion exchange membrane separator. The anode comprises the nickel or cobalt metal to be anodically dissolved while the cathode is a non-dissolvable cathode. In further embodiments, the anodic dissolution is performed in an acidic electrolyte, for example, sulfuric acid to so produce the corresponding metal sulfates. Where desired, the metal salt enriched anode solution can be passed through a membrane distillation unit to further concentrate the metal salt solution by removing water, which can be recycled in the anodic dissolution system. The nickel or cobalt salt solution can then be directly used in producing the metal oxides used in lithium ion and other batteries.

The application discloses a magnesium alloy with high corrosion resistance and low stress corrosion tendency and a preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy has the following chemical components: 0.5-1.0% of aluminum, 1.0-4.0% of rare earth elements, and the balance of magnesium and inevitable impurities. The preparation method of the magnesium alloy comprises five steps of melting and casting, homogenization, solid solution treatment, multi-pass rolling and stress relief annealing. The application effectively controls the growth kinetics and growth morphology of the magnesium alloy surface hydroxide in the corrosive medium by reasonably designing the alloy components, increases the density of the magnesium alloy, reduces the penetration of chloride ions and hydrogen in the solution, and effectively reduces the anodic dissolution cracking and hydrogen embrittlement mechanical cracking.

The invention discloses a method for plating indium on the surface of a copper back plate for recycling a target material. The method comprises the following steps: adjusting the pH value of a sodium chloride solution to 1-3.5 by using an acid solution to obtain an electrolyte; an inert cathode plate is used as a cathode, and a copper back plate is used as an anode; and controlling the electrolytic voltage to be 0.1-5V, carrying out an electrolytic reaction to obtain an indium-containing electrolyte and an indium layer deposited on the surface of the inert cathode plate, and finally recovering indium in the indium-containing electrolyte and the indium layer to obtain an indium hydroxide precipitate. By means of low-voltage selective electrolysis, efficient anode dissolution and cathode directional deposition of indium are achieved, physical mixing or chemical co-dissolution of copper and indium is avoided, the purity of recycled metal indium is high, corrosion to a copper backboard base body is small, operation is easy, automatic line production is facilitated, the recycling efficiency is high, the working voltage is low, energy consumption is small, cost is low, and toxic waste gas is avoided. The electrolyte can be recycled, the waste liquid amount is small, and pollution is avoided.

The invention belongs to the technical field of precious metal compound preparation, and particularly relates to a method for preparing cyanide-free gold plating solution gold sodium sulfite. A mixed solution of sodium sulfite and sodium chloride is used as anolyte, a sodium hydroxide solution is used as catholyte, and sodium sulfite in the anolyte is used as a complexing agent of gold ions and cooperates with sodium chloride to promote anode dissolution. According to the method, the toxicity risk of a traditional cyanide method is avoided, the reaction condition is mild, the product purity is high, no nitric oxide is generated in the process, no dangerous thanic acid gold intermediate is generated in the process, chloride ions can be effectively reduced, and a green and environment-friendly product can be produced.

This invention discloses a green electrochemical polishing slurry and polishing method for additive manufacturing of stainless steel, belonging to the field of stainless steel surface treatment technology. The electrochemical polishing slurry comprises an acid, a polyol, glucose, sodium tungstate, and a corrosion inhibitor, wherein phosphoric acid is preferred, and polyaspartic acid is preferred. The polishing method includes surface pretreatment of the additively manufactured stainless steel workpiece, electrochemical polishing treatment, and post-polishing cleaning treatment. This invention utilizes the synergistic effect of sodium tungstate and polyaspartic acid to dynamically control the anodic dissolution interface during polishing, effectively suppressing over-polishing and pitting defects easily caused by the surface heterogeneity of additively manufactured stainless steel. Using the polishing slurry and method provided by this invention, the surface roughness of additively manufactured stainless steel can be significantly reduced, obtaining a bright and smooth high-quality surface. Furthermore, the polishing slurry is environmentally friendly and has significant industrial application value.

The invention discloses a method for preparing high-purity bismuth through electrolytic refining and an electrolysis system. The method comprises the following steps that an electrolyte is added into an electrolytic bath, an impurity removal agent is added into an impurity removal tank, the electrolytic bath and the impurity removal tank are connected through a guide pipe, and liquid in the electrolytic bath and liquid in the impurity removal tank circularly flow through a circulating pump for impurity removal; and the negative plate and the refined bismuth positive plate are oppositely inserted into the electrolyte, direct current is introduced for electrolysis, in the electrolysis process, the impurity removal process is continuously carried out, and high-purity bismuth is obtained on the negative plate. The electrolysis system is composed of an impurity removal agent liquid storage tank, an impurity removal tank, a filtering system and an electrolytic bath. The synchronous impurity removal process is integrated in the electrolysis process, impurities generated by anode dissolution can be removed in time, the product purity of high-purity bismuth is guaranteed, damage of the impurities to the performance of the electrolyte is reduced, the service life of the electrolyte is effectively prolonged, the consumable replacement cost in the production process is reduced, and collaborative improvement of quality improvement and cost reduction is achieved.

The invention discloses a method for preparing 6N indium by taking 4N indium as a raw material, which comprises the following steps: S1, preparing an anode plate and an indium sulfate electrolyte by taking 4N indium as a raw material; s2, taking the electrolyte in the step S1 and an anode plate as raw materials, placing the raw materials in a diaphragm electrolytic cell, and carrying out a pulse pre-electrolysis process; and S3, after the step S2 is finished, a negative plate of the diaphragm electrolytic cell is replaced, a bidirectional pulse electrolysis process is carried out, and 6N indium is prepared from the negative electrode. By adopting the anion exchange membrane, low-potential impurities and high-potential metal impurity ions dissolved in the anode can be only retained in the anode liquid and cannot penetrate through the anion exchange membrane to enter the cathode chamber, so that the impurity ions are prevented from being separated out at the cathode to influence the purity of indium. The invention innovatively provides a technology for preparing 6N indium through pulse preelectrolysis impurity removal-bidirectional pulse electrolysis by utilizing the characteristics of pulse electrolysis. The technology is advanced and reliable in process, low in cost and high in efficiency, and has great application potential and popularization value.

The invention discloses a recycled copper purification device and method based on an electrolytic method.The recycled copper purification device comprises an electrolytic bath, an electrolyte circulating system matched with the electrolytic bath and a conductive control unit, a bottom conductive copper bar is arranged at the bottom in the electrolytic bath, and a top conductive copper bar is arranged on the upper side of the electrolytic bath; limiting structures are arranged on the bottom conductive copper bar and the top conductive copper bar so that anode baskets and cathode plates can be alternately installed at intervals, and each anode basket comprises a frame body with an opening in the upper end and two hollowed-out sides and filter screens laid at the hollowed-out positions of the two sides. And the electrolytic bath is externally connected with a compressed air pipe so as to introduce compressed air into the electrolytic bath. According to the method, the problems that anode slime is difficult to clean, an anode is not fully dissolved, an electrolyte is not uniformly distributed and the purity of cathode copper is insufficient in the copper recovery process through an existing electrolytic method can be solved.

The application discloses an electrolytic machining stray corrosion inhibition method based on a zirconium electrode and a bipolar pulse, and comprises the following steps: adopting metal zirconium as a tool electrode; during machining, a bipolar pulse voltage is applied between the tool electrode and a workpiece; through polarity switching of the bipolar pulse voltage, a surface oxide layer of the zirconium electrode is driven to spontaneously form a structure partition with an end face conducting and a side wall insulating in a positive pulse machining stage, so as to inhibit stray corrosion. The application utilizes the synergistic effect of bipolar pulse alternating polarization and the passivation characteristics of the zirconium electrode, effectively shields the side electric field without a side wall insulating coating, significantly improves machining precision, and fundamentally eliminates the problem of anode dissolution loss of the tool electrode caused by a negative pulse in traditional bipolar pulse electrolytic machining.

The invention discloses a hard and brittle wafer lossless thinning method based on internal and external cooperative laser modification and electrochemical stripping, and belongs to the technical field of semiconductor manufacturing. The method comprises the following steps: (1) scanning in a predetermined depth in a wafer by adopting a first beam of ultrafast laser to form a continuous internal modified layer so as to define the final stripping thickness; (2) scanning and ablating the back surface of the wafer by adopting a second beam of laser to form a micro-channel array which is directly communicated with the internal modification layer; (3) placing the wafer as an anode in an electrochemical device, and performing selective electrochemical anode dissolution on the internal modified layer by using the micro-channel array as a channel for efficiently permeating electrolyte and rapidly discharging reaction products, so that the main body layer of the wafer with the preset thickness is nondestructively stripped from the matrix; and (4) carrying out ultra-precision polishing on the new surface of the stripped wafer main body. Through internal and external synergistic modification, an efficient mass transfer channel is constructed, and the problems of efficiency and uniformity in large-area internal stripping are innovatively solved.

This invention belongs to the field of chemical power source electrode materials, and discloses a Mg-Dy-Ho anode material for magnesium-air batteries, its preparation method, and its application. The anode material is prepared from the following raw materials by mass percentage: 0.3-1.5% Mg-30%Dy master alloy, 0.3-1.5% Mg-30%Ho master alloy, with the balance being high-purity metallic magnesium. This invention uses high-purity magnesium as the matrix, and incorporates rare earth elements dysprosium and holmium to achieve microalloying, effectively balancing the activation and passivation contradictions of the magnesium anode. It also innovatively uses a sealed container instead of the crucible and mold in the conventional melting process, and performs ultrasonic treatment during melt solidification. This design significantly improves the uniformity of anode dissolution and corrosion resistance. Experiments have shown that the coexistence of Dy and Ho can synergistically reduce the corrosion current density, increase the discharge voltage plateau, and effectively suppress hydrogen evolution side reactions, increasing the anode utilization rate to 61.1%.

The present application relates to electrolytic processing equipment technical field, especially to a kind of flexible gear electrolytic processing machine tool, comprising: machine tool body, the machine tool body is equipped with working tank, main shaft module, liquid return tank and electrical cabinet module;Working tank, the positioning fixture is provided in the working tank, for fixing the flexible gear to be processed;Main shaft module, the main shaft module is set in the upper of the working tank.This application is provided with the positioning fixture for fixing flexible gear workpiece in the machine tool body and the cathode mounting seat that can drive electrode relative flexible gear feeding by main shaft module, cathode mounting seat inside is equipped with multiple-stage flow channel that is sequentially communicated, so that electrolyte can be directional delivery to the gap region between flexible gear and electrode, electrolysis reaction is generated between electrode and workpiece through electrolyte, flexible gear produces anodic dissolution, electrolyte flows continuously along flow channel in reaction process and removes product is discharged, to avoid the product that removes in the tooth surface that flexible gear is processed and formed is accumulated and adhered.

This invention belongs to the field of precision metal surface machining and additive manufacturing post-processing technology. It provides a quasi-dry electrochemical mechanical polishing method for additively manufactured components. The method first selects the abrasive particle size based on the initial roughness, defect size, and surface characteristics of the component surface; then, it selects the electrolyte based on the component material; next, it mixes the abrasive and electrolyte to obtain a quasi-dry polishing medium; finally, it connects the component as the anode to a pulsed power supply. Under the relative motion between the abrasive and the workpiece, the abrasive contacts the raised areas on the workpiece surface, forming a localized micro-electrolysis cell, and simultaneously performs mechanical grinding and electrochemical anodic dissolution, achieving selective material removal from surface protrusions. This invention uses ordinary high-hardness spherical abrasives instead of ion exchange resin, significantly reducing costs, increasing abrasive reusability, reducing material loss, improving polishing efficiency, and significantly reducing electrolyte consumption. It is suitable for efficient and precise post-processing of additively manufactured metal components.

The invention discloses a corrosion inhibitor for a metal surface and a preparation method of the corrosion inhibitor, a corrosion inhibition additive and modified benzotriazole react, so that amino groups on the corrosion inhibition additive and double bonds on the modified benzotriazole react, and the corrosion inhibitor for the metal surface is prepared. Lone pair electrons of nitrogen atoms on an imidazoline ring and nitrogen atoms of an amino group outside the ring in a corrosion inhibitor molecule can be coordinated and bonded with an empty d orbit of a metal atom to form a stable coordination compound, and meanwhile, a benzotriazole molecule can also be adsorbed on active sites of an anode region and a cathode region on the surface of metal, so that the corrosion inhibitor has a good corrosion inhibition effect. The corrosion inhibitor molecules form a compact protective film on the metal surface, the anode dissolution process that the metal loses electrons and is changed into ions can be inhibited, the reduction reaction of the electrons of substances such as oxygen in a cathode region is hindered, and the synchronous inhibition on the cathode and anode reaction greatly reduces the current density of corrosion and improves the corrosion resistance of the metal. And corrosive substances are prevented from being in contact with the metal surface.