19 results about "Cathode polarization" patented technology

The application discloses a kind of based on the coupling of electrochemical parameter gap corrosion evaluation method and device, it is related to electrochemical corrosion evaluation technical field.Gap corrosion evaluation method includes the following steps: based on gap structure establishes oxygen concentration cell, determines anode, cathode and its surface area;In the oxygen-poor medium environment, the anodic polarization curve of target material is measured, the cathodic polarization curve of target material is measured in the oxygen-rich medium environment, obtains anode current density-potential relationship and cathode current density-potential relationship;According to the electrochemical balance formula that total cathode current is equal to total anode current, the coupling potential of oxygen concentration cell is calculated, and further the gap corrosion current density corresponding to coupling potential is obtained, and the gap corrosion rate is calculated according to gap corrosion current density.The gap corrosion evaluation method provided by the application is suitable for the rapid prediction of initial stage of gap corrosion, with the characteristics of convenient, high repeatability, the result is more accurate.

The invention provides a copper-tin alloy electroplating solution, a preparation method thereof and a preparation method of a solar cell metal electrode, and particularly relates to the technical field of solar cell preparation. The copper-tin alloy electroplating solution provided by the invention comprises copper salt, tin salt, a complexing agent, an antioxidant, a surfactant and water. Wherein the complexing agent and the copper salt act and are combined with the surfactant to reduce the charge density of an electrode interface, increase cathode polarization and reduce the equilibrium potential difference between copper and tin, so that the reduction and deposition efficiency of metal ions in the electroplating process is improved, the porosity, roughness and defects of a plating layer are reduced, and the plating layer is more uniform and compact. The structure of the antioxidant serving as the plating layer can also prevent the plating layer from being oxidized, and the service life of the copper-tin alloy is prolonged. According to the electroplating liquid, codeposition of copper and tin can be achieved, the working procedure is simplified, therefore, wastewater discharge in the production process is reduced, the manufacturing cost is reduced, and the electroplating liquid is more competitive in industrial production.

The application discloses a kind of based on the deconvolution technology's automobile dissimilar metal galvanic compatibility evaluation method, comprising the following steps: for dissimilar metal A material, through basic electrochemical parameters, including solution pH value, oxygen content, metal ion initial content etc. Information, the equilibrium potential of cathode reaction and anode reaction is calculated;Step defines the Tafel slope of oxygen and H+ reduction reaction, exchange current density and limiting diffusion current density parameter, and the cathode polarization curve of oxygen and H+ reduction is fitted.The application is suitable for corrosion protection technical field, relates to the galvanic corrosion compatibility evaluation method of dissimilar metal connecting structure in automobile, and the deconvolution technology is integrated into dissimilar metal galvanic compatibility evaluation, can significantly shorten experimental period, realizes the evaluation fast of dissimilar metal galvanic compatibility in automobile.

A surface-treated aluminum material (1) comprising: a base material (2) comprising an aluminum alloy in which the content of aluminum or Cu is 0-1.8 mass%; and a protective film (3) formed on the base material (2). The protective film (3) has: an oxide layer (31) that contains an aluminum oxide and covers the base material (2); and a hydrated oxide layer (32) that contains a hydrated oxide of aluminum and covers the oxide layer (31). When the surface-treated aluminum material (1) is subjected to cathodic polarization measurement of the base material (2) using a specific measurement solution and heated at a temperature of 200 DEG C for 4 hours, the ratio (J1 / J2) of the current density (J1) of the surface-treated aluminum material (1) at a specific potential to the current density (J2) of the base material (2) is 150 * 10-5 or less.

This application discloses a method for preparing a composite electrode for lithium extraction from salt lakes, belonging to the field of salt lake lithium extraction technology. The method involves first preparing nitrogen-doped carbon nanotubes, then mixing nitrogen-doped carbon nanotubes of different masses with the same mass of electrode active material to obtain an electrode active material coated with a nitrogen-doped carbon nanotube layer. These layers are then modified with dopamine to prepare electrode slurries, which are then coated onto a current collector. The mass of the pore-forming agent in each active coating layer decreases in a gradient along the direction away from the current collector, and the thickness of the modified nitrogen-doped carbon coating layer in the electrode active material also decreases in a gradient. By using active materials with different carbon coating layer thicknesses to prepare the lithium extraction electrode, with the bottom carbon coating layer being thicker closer to the current collector, the electrochemical reaction rate of lithium ions is suppressed to a certain extent, thereby reducing cathode polarization, preventing impurity cations from embedding into the crystal lattice, and improving the purity of lithium ions in the salt lake lithium extraction recovery solution.

The invention discloses a method for preparing a Gd2O3 film based on an electrochemical deposition technology, and relates to the technical field of electrochemical deposition. Electrochemical deposition is realized through the electrode and the circuit, the electrode serves as a reaction interface, the anode and the cathode form a loop to provide a reaction place, the circuit conducts current, and an external power supply conveys current to the electrode through the circuit to form an electric field to promote ions to directionally migrate to the surface of the electrode; the growth effect of the gadolinium oxide film is regulated and controlled by changing technological parameters of electrochemical deposition so as to meet the requirements of different research fields; the crystal nucleation rate is regulated and controlled by changing the deposition potential, that is, the cathode polarization effect is influenced by changing the current density generated by the cathode potential; the preferred orientation of crystal growth is regulated and controlled by changing the deposition temperature, so that the compactness and the atomic surface density of the crystal are changed; and the growth coverage rate and the electro-deposition amount of the gadolinium oxide film are regulated and controlled by changing the deposition time, so that the thickness of the gadolinium oxide film is regulated and controlled.

The invention relates to the technical field of copper plating electrolyte, in particular to a high-brightness pyrophosphate copper plating additive, electrolyte and a copper plating method thereof. The high-brightness pyrophosphate copper plating additive comprises the following substances in parts by weight: 15-30 parts of a polyhydroxy compound; 0.5 to 2.5 parts of a sulfur-containing organic compound; 80 to 120 parts of lauryl sodium sulfate; and 5-15 parts of organic phosphonate. The problem that the glossiness of a pyrophosphate copper plating layer is insufficient is solved through the synergistic effect of quaternary components; the polyhydroxy compound and copper ions can form a weak complex, the deposition rate is adjusted, and grains are refined; the sulfur-containing organic compound is adsorbed to a cathode active site, so that the polarization effect of the cathode is enhanced, and transverse growth of crystal grains is inhibited; the organic phosphonate can maintain balance of metal ions in the plating solution, and precipitation caused by excessive consumption of main salt is avoided. Through the synergistic effect of the four components, the concentration of free copper ions can be reduced, longitudinal arrangement of crystal grains is promoted, a mirror surface structure coating is formed, and meanwhile negative effects on the service life of the plating solution are reduced.

The application relates to a preparation method of a carbon-doped TiO2 / bismuth sulfide composite material and application thereof in electrochemical corrosion prevention. The carbon-doped TiO2 / bismuth sulfide composite material is prepared from a titanium metal organic framework through a low-temperature one-step hydrolysis method. The photoanode constructed by the composite material generates photo-induced electrons which migrate and enrich to the surface of the protected metal under illumination, so that the metal cathode is polarized to reach a thermodynamic stable state, and then the metal corrosion is inhibited, thereby constructing a metal corrosion prevention method of photoelectrochemical cathode protection. The combined modification method of carbon doping and composite narrow-band-gap bismuth sulfide semiconductors is adopted to overcome the defects of titanium dioxide, such as only absorbing ultraviolet light and photo-induced electron-hole easy recombination.

The present application relates to a kind of water treatment systems and applications of electrooxidation coupling four electron oxygen reduction, water treatment system includes electrolytic cell, BDD anode arranged in electrolytic cell, cathode arranged in the both sides of BDD anode, and for the oxygen of BDD anode, cathode is blown into aeration disc, using double cathode setting and the high 4eORR activity NF / P@Fe-N-C prepared as cathode, reduce cathode polarization, the bottom of reactor is provided with microporous aeration disc, provides the necessary reactant oxygen of cathode and induces forced convection.In addition, the present water treatment system is also used for electrooxidation degradation phenol, compared with prior art, the present application can improve the theoretical value of cathode potential from 0V of HER to 1.23V vs.RHE, realize 1.57V of ultra-low thermodynamic equilibrium potential, while realizing the deep treatment of refractory organic pollutants and the significant reduction of energy consumption, provide practical application value for electrooxidation system in energy-saving treatment of organic pollutants in wastewater.

The present application relates to the technical field of electroplating, in particular to a cyanide-free silver plating solution, a preparation method thereof and a silver plating method. The cyanide-free silver plating solution comprises the following components in terms of mass concentration: silver ions 10-25 g / L, potassium sulfamate 80-170 g / L, potassium pyrosulfite 30-70 g / L, imidazole propoxy condensate 0.1-1 g / L and p-anisaldehyde 0.05-0.5 g / L. The cyanide-free silver plating solution does not appear to replace the silver layer on the surface of the substrate without electricity, ensuring that the quality of the plating layer is excellent and has a high bonding force with the substrate. The cyanide-free silver plating solution has good stability and is not prone to produce precipitation during long-term use. The cyanide-free silver plating solution has a large cathode polarization effect during the electroplating process, making the silver plating layer crystallize more densely, the plating layer has high hardness, good wear resistance and low contact resistance. In addition, the cyanide-free silver plating solution does not contain cyanide, which is green, safe and environmentally friendly.

The present invention discloses a capillary electro-hydraulic beam machining device with a built-in metal wire and its use method, comprising: a pipe interface having a first cavity therein, the top of which is connected to an electrolyte inlet and a power supply cathode inlet; a sleeve having a second cavity, a transition hole, and a downward-facing tapered hole therein, sequentially connected from top to bottom; a rubber plug disposed in the transition hole; an elastic chuck disposed in the tapered hole; a capillary coaxially disposed in the sleeve, the lower section of which sequentially passes through the central channels of the rubber plug and the elastic chuck; an electrode wire coaxially inserted into the top of the capillary; the second cavity and the first cavity are connected to form a chamber for storing electrolyte; the electrode wire is used to perform cathode polarization on the electrolyte; and the capillary is used to circulate the cathode-polarized electrolyte and eject it downward to form an electro-hydraulic beam. The device solves the problem of difficult positioning of the capillary and the metal wire in existing electro-hydraulic beam machining technologies.

A circuit board foil surface treatment device relates to the technical field of circuit board foil production, and comprises a coarsening tank body and a foil surface, the inner side of the coarsening tank body is rotatably provided with a liquid extrusion roller and a conductive roller, the foil surface is extruded by the liquid extrusion roller and the conductive roller to discharge liquid, anode plates are fixed on the front side and the rear side, corresponding to the foil surface, in the coarsening tank body, and the front side and the rear side of the foil surface are respectively provided with an anode plate. According to the circuit board foil surface treatment device, when copper foil runs, the current density is improved, the cathode polarization can be improved, the electroplating efficiency can be improved, plating layer crystallization of the copper foil is more compact, and the copper foil surface treatment device has the advantages that the copper foil surface treatment effect is better, and the service life of the copper foil surface treatment device is prolonged. And the plating layer crystal is finer, that is, the appearance of the copper foil is reduced, and the electroplated crystal is more compact and uniform in growth vigor, so that short circuit and open circuit cannot occur when downstream customers use the copper foil, the current density can be improved to a certain extent, and the increase of the electric power cost is reduced.

The invention discloses a deep well type direct current grounding electrode gas production current density threshold value calculation method and system, and the method comprises the steps: fitting a cathode polarization curve of a grounding electrode according to the current density and potential data in the electrolytic reaction process of the grounding electrode, and solving a cathode polarization curve zero crossing point through a second-order difference method; therefore, the actual hydrogen evolution current density threshold value of the deep well grounding electrode is obtained, a linear section does not need to be manually selected for extrapolation, errors caused by manual selection of polarization curve inflection points are avoided, and the obtained hydrogen evolution current density threshold value is more accurate. The technical problem that the error of the obtained hydrogen evolution current density threshold value is large due to the fact that a linear section of a cathode polarization curve of the grounding electrode needs to be manually selected for extrapolation and inflection point selection in an existing mode for determining the hydrogen evolution current density threshold value of the deep well grounding electrode is solved.

The marine sacrificial anode protection device comprises a ship body, a supporting column is fixedly connected to the top of the ship body, a protection box is fixedly connected to the top of the supporting column, a motor is fixedly connected to the interior of the protection box, and a threaded lead screw is fixedly connected to one end of the motor; the marine sacrificial anode protection device comprises a protection box, a threaded lead screw is arranged in the protection box, the threaded lead screw penetrates through the protection box and extends to the outside of the protection box, the outside of the threaded lead screw is in threaded connection with a square block, and the bottom of the square block is fixedly connected with a movable frame. The sacrificial anode can be cleaned through mutual cooperative use of the supporting column, the motor, the threaded lead screw, the square block, the movable frame, the stainless steel wire brush and the stand column, the electrochemical activity of the sacrificial anode is remarkably enhanced at the moment after cleaning, electron release and transmission are recovered to be smooth, the cathode polarization state of the metal surface of a ship body is maintained, and the service life of the ship body is prolonged. Corrosion of the ship body is effectively inhibited, and the structural integrity of the ship is ensured.

This invention relates to the field of solid oxide fuel cells, specifically disclosing a method for preparing a cathode material for solid oxide fuel cells, comprising the following steps: mixing raw materials including lanthanum metal salt, nickel metal salt, a complexing agent, and a solvent to obtain an LNO impregnation solution; mixing the LNO impregnation solution with LSCF and then performing a solvothermal reaction to obtain the cathode material. The preparation method of this invention controls parameters such as the concentration of the LNO impregnation solution, the solvent ratio, and the temperature of the solvothermal reaction to regulate the particle size and distribution of La2NiO4 modified on the LSCF surface, thereby shortening the electron and ion transport distance, accelerating the charge transfer process, reducing the cathode polarization resistance, and improving chemical stability.

The invention discloses a dissimilar metal galvanic couple compatibility evaluation method based on a linear analysis technology, and the method comprises the following steps: 1, drawing a polarization curve graph of which the horizontal axis is logarithmic current density X and the longitudinal axis is potential Y according to the original polarization curve data for the polarization curve data of a dissimilar metal A material; and 2, obtaining an intersection point of the cathode polarization curve and the anode polarization curve, and making a self-corrosion potential line Y = Y0 through the intersection point. The method is suitable for the technical field of corrosion protection, and relates to a galvanic corrosion compatibility evaluation method for a dissimilar metal connection structure in an automobile, a plan curve analysis technology is integrated into dissimilar metal galvanic compatibility evaluation, and the method is suitable for evaluating the compatibility of the dissimilar metal connection structure. The experimental period can be remarkably shortened, and the compatibility of the dissimilar metal galvanic couple in the automobile can be quickly evaluated.

The present invention discloses a method for preparing modified carbon nanotubes and electrodes and their application in lithium extraction from salt lakes, belonging to the technical field of lithium extraction from salt lakes. The method for preparing modified carbon nanotubes comprises the following steps: uniformly mixing hydroxylated carbon nanotubes, a silane coupling agent, and a first solvent, extracting by reflux, washing, and drying to obtain a precursor; adding the precursor, a chain transfer agent, a magnesium source, a hydrophilic acrylate monomer, an acrylamide monomer, a crosslinking agent, and an initiator to a second solvent for reaction, first washing with ethanol and deionized water, respectively, and drying, and then washing away the magnesium ions with a hydrochloric acid solution to obtain the modified carbon nanotubes. The modified carbon nanotubes can effectively adsorb magnesium ions on the electrode surface, prevent the magnesium ions from embedding into the electrode material, and inhibit cathode polarization, thereby effectively improving the lithium extraction efficiency and cycle stability of the electrode.

This invention relates to the field of water treatment technology and discloses an advanced oxidation treatment system for broad-spectrum removal of organic pollutants from water. The system includes a reaction module, a sensing module, a dosing module, a power supply module, and a control module. The reaction module is filled with a composite packing material composed of carbon-coated copper-doped two-dimensional titanium carbide catalyst particles, graphite particles, and quartz sand particles, and a three-dimensional volume electrode is constructed using a flow distribution network. The sensing module acquires redox potential and dissolved oxygen concentration data. The control module calculates the spatial decay gradient to determine the state of reaction path obstruction. By adjusting the opening frequency of the pulse dosing valve and the asymmetric pulse waveform output by the power supply module, which includes both cathode and anodic polarization output stages, divalent copper ions on the surface of the composite packing material are reduced by electron injection, and nascent oxygen is precipitated by water electrolysis, achieving spatiotemporal decoupling and reconstruction. This invention solves the problems of reduced treatment efficiency caused by catalytic activity passivation and uneven oxygen source distribution.