11 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.

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 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 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.

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.

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.

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.