33 results about "Anode polarization" patented technology

The invention belongs to the field of stainless steel pickling, and particularly relates to an austenitic stainless steel whole-hydrochloric-acid-based stepped pickling method. At present, stainless steel pickling is mainly based on a mixed acid pickling (nitric acid and hydrofluoric acid) system, the problem of three-waste discharge exists in the pickling process, the pickling process is only suitable for removing ferritic stainless steel with weak binding force between an oxide layer and a metal matrix through pickling, and the oxide layers on the surfaces of ferritic cold plate stainless steel and austenitic stainless steel are difficult to remove. In order to solve the problems, hydrochloric acid is used for providing an acid environment, a pre-pickling and grading final pickling cooperative treatment method is adopted, a compact oxide layer on the surface of the austenitic stainless steel can be effectively removed, surface polishing and surface passivation can be achieved through the anodic polarization effect, and the stainless steel surface after pickling is free of pitting corrosion and intergranular corrosion phenomena; and the pickled stainless steel surface has high smoothness, the leveling and polishing quality of the BA plate can be remarkably improved, meanwhile, the production cost is low, and pickling waste liquid can be regenerated and recycled.

The invention provides a rapid cleaning method for a stainless steel welding seam, which adopts a method of carrying out constant-current anodic polarization on a stainless steel welding part in a sodium sulfate solution, and can rapidly and completely remove surface oxidation color after stainless steel welding. The method is simple and easy to operate, the used solution is safe and pollution-free, and the corrosion resistance of the surface of the treated weld joint is remarkably improved.

The utility model discloses a metal material accelerated corrosion test device, include: box (1), be provided with electric control system (12) on the box, water collecting tank (2), set up in the lower part of box (1), sample stage (9), set up above water collecting tank (2), electrolyte water tank (6), set up above sample stage (9), have liquid outlet pipeline, be provided with throttle valve (16) and liquid outlet ware (22) on the liquid outlet pipeline, circulating water pump (3), set up between water collecting tank (2) and electrolyte water tank (6), electrode loop, including anode wire (19), cathode wire (20), graphite electrode (21) and direct current power supply, the utility model discloses through temperature control, oxygen enrichment, anodic polarization etc. means, carry out acceleration under the condition of low conductivity, and integrate ultraviolet and temperature and humidity control, realize to highland environment carries out simulation accelerated corrosion test to provide the basis for the selection and evaluation of material.

The invention relates to a method for evaluating the influence of hydrogen on stress corrosion fracture of pipeline steel in an acid environment, which comprises the following steps: (1) respectively carrying out slow strain rate tensile tests in the acid environment and a nitrogen environment, and determining the damage degree of the acid environment on the mechanical property of a pipeline steel sample; (2) carrying out fast and slow scanning anodic polarization curve test, hydrogen permeation curve test and hydrogen filling-slow stretching test on the pipeline steel sample, and determining the damage degree of hydrogen separated out by cathodic reaction on the mechanical property of the pipeline steel sample; and (3) determining the influence degree and contribution rate proportion of hydrogen to the stress corrosion fracture of the pipeline steel in the acid environment. According to the method, the stress corrosion performance of the sulfur-resistant pipeline steel can be accurately and quickly evaluated, the proportion and contribution rate of hydrogen-induced stress corrosion sensitivity in the stress corrosion sensitivity of the pipeline steel in the acid environment are analyzed, and the influence degree of hydrogen on stress corrosion fracture of the pipeline steel in the acid environment is quantitatively represented.

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.

To provide a measurement method which can perform on-site measurement and can evaluate corrosiveness with high accuracy.SOLUTION: A measurement method includes the steps of: bringing stainless steel into contact with an electrolyte solution with pH of 15-16; measuring the anode polarization curve of the stainless steel; and measuring a charge amount caused by the dissolution to the electrolyte solution of chromium carbides and / or chromium nitrides from the anode polarization curve.SELECTED DRAWING: None

The purpose of the present invention is to provide an alkaline subcritical water composition, a water-containing composition, a device, and a container which are capable of inhibiting corrosion of a reaction device and capable of decomposing a polymer and the like. The present disclosure is an alkaline subcritical water composition having a pH of 13.7 or less and a potential of 400 mV or more when a current density exceeds 10 mA / cm2 in an anodic polarization curve in which a steel material is used in a test electrode.

The present invention belongs to the field of microbial corrosion protection of metal materials, and in particular provides an anodic polarization method and a special stainless steel material for inhibiting microbial corrosion of marine oil and gas transmission pipelines, adopting an anodic constant potential anodic polarization treatment method, the anodic constant potential selection interval range is: above the middle value of the passivation interval potential range to 0.05V below the pitting potential, and the anodic polarization action time is the actual time required for protection. The present invention forms a positively charged area on the surface of stainless steel, which firmly adsorbs negatively charged bacteria on the surface of the metal material, inhibits the activity of microorganisms adsorbed on the surface, and forms an EPS-Fe film layer for survival, thereby protecting the material. At the same time, the present invention also provides a special stainless steel material, which combines the applied anodic electrical signal with the common advantages of the special stainless steel material, and proposes an effective solution to the problem of inhibiting microbial corrosion of marine oil and gas transmission pipelines.

This invention relates to the field of lithium-ion battery technology, disclosing an electrolyte composition, an electrolyte, a method for preparing the same, and a lithium-ion battery. The composition contains a lithium salt, a film-forming additive, an organic solvent, and an auxiliary agent; wherein, based on the total weight of the electrolyte, the lithium salt content is 6-20 wt%, the film-forming additive content is 2-6 wt%, the organic solvent content is 75-90 wt%, and the auxiliary agent content is 2-10 wt%; the auxiliary agent is a combination of 4-iodophthalonitrile and 6-fluoro-nicotinamide in a mass ratio of 1:0.5-2. The electrolyte prepared from the electrolyte composition provided by this invention, when applied to a lithium-ion battery system with a single-particle graphite anode, can significantly improve the interfacial stability of the single-particle graphite anode at high temperatures, suppress the increase in anode polarization and gas generation problems; and can significantly improve the high-temperature cycle life and high-temperature rate performance of the lithium-ion battery.

To provide a simple method for electropolishing titanium or titanium alloys without using organic electrolytes containing perchlorates or alcohols. [Solution] A method for producing electropolished titanium or titanium alloy is provided, which includes a step of anodic polarization of titanium or titanium alloy using a dry ionic liquid containing halide ions.

A method for reducing the oxide layer of titanium components of an anode in an electrolysis cell, wherein the method is carried out in an electrolysis stack and / or an electrolyzer, comprising polarizing the anode to a negative potential and supplying the anode with a reducing medium, wherein the titanium surfaces are coated with metal layers of less than 1 micrometer thickness, wherein the reducing medium is a gas selected from the group consisting of hydrogen, carbon monoxide, ammonia and hydrocarbons and mixtures thereof.

The application discloses a kind of high-pressure polarization quantum dot electrode preparation process without attenuation, belongs to energy storage electrode preparation technical field.The process includes five core steps of quantum dot pretreatment, electrode coating, drying, two-way differentiation polarization, post-processing, by surface pretreatment to carbon quantum dots and silicon oxide quantum dots, optimize coating process, adopt two-way differentiation polarization of accurate temperature control, control field, combined with post-processing solidification, prepare anode polarization carbon quantum dot positive electrode and cathode polarization silicon oxide quantum dot negative electrode.The polarization quantum dot electrode prepared in the application has strong charge trap stability, non-decay charge density, complete electrode structure, no cracking, falling phenomenon when working in the range of 0.1V to infinite high voltage, adapts to infinite high-voltage energy storage device, solves the technical pain points of existing polarization electrode performance attenuation under high pressure, structure damage.

The present invention relates to the technical field of photoelectrochemical cathode protection, and in particular to a method for evaluating the photocathodic protection performance of semiconductor materials. A method for evaluating the photocathodic protection performance of semiconductor materials, comprising the following steps: step A, preparing semiconductor electrodes from semiconductor materials; step B, dark state anodic polarization curve test of the metal to be protected: testing the anodic polarization curve of the metal to be protected in a desired solution environment and in a dark state; step C, photocathodic polarization curve test of the semiconductor electrode: testing the cathode polarization curve of the semiconductor electrode in a desired solution environment and under illumination. The method for evaluating the photocathodic protection performance of semiconductor materials can preliminarily judge the photocathodic protection performance of semiconductor electrodes for specific metals without coupling metal electrodes, has a fast characterization speed, and a high accuracy, and solves the problems of poor stability and low test efficiency of existing characterization methods for the photocathodic protection performance of semiconductor materials.

The invention discloses a method for simulating an anodic polarization curve. The method comprises a preparation step, a first calculation step, a corrosion voltage simulation step, a second calculation step, a corrosion current simulation step and a coupling step. The method comprises the following steps: a first calculation step: substituting crystal face arrangement and a plurality of background charges into a density functional theory for calculation; the method comprises a first calculation step of obtaining a contact potential difference corresponding to each background charge, a second calculation step of obtaining a simulated corrosion voltage by adding the contact potential difference corresponding to each background charge to a work function corresponding to crystal face arrangement, and a third calculation step of obtaining a surface vacancy energy corresponding to each background charge through a density functional theory. And a corrosion current simulation step: substituting the surface vacancy energy of the plurality of background charges into an Arrhenius formula to calculate a simulation current density so as to simulate an anode polarization curve and reduce the time of a complex experiment.

The application discloses a kind of integrated mechanism reconfiguration and electrolytic cell collaborative control method of knowledge decision drive, it is related to metallurgical automation and industrial artificial intelligence technical field.The method comprises: first, the temperature field in the interior of electrolytic cell and side department are constructed with physical information neural network online, and the self-adaptive adjustment of model parameter is realized by introducing reinforcement learning algorithm;Through the feature selection module of fusion self-attention mechanism, the working condition data is dynamically weighted, and the global state vector representing anode polarization and thermal field fluctuation is extracted;Design composite reward function containing expert knowledge constraint and carbon emission cost, guide reinforcement learning intelligent agent to generate discharging control strategy considering energy efficiency stability and advance emission reduction.The application reduces unnecessary anode adjustment action and alumina discharging action, realizes the deep cooperation of energy balance and material balance, significantly improves current efficiency and controls greenhouse gas emission intensity.

The invention relates to an anode electrode for a PEM electrolysis cell and a method for producing hydrogen. An anode electrode for a PEM electrolysis cell employing an aqueous solution containing perchlorate, the matrix of the anode electrode comprising, in percentage by mass: 22% < = Nilt; 80%, 95% < = Ni + Fe, and unavoidable impurities, the aqueous solution containing perchlorate at a concentration of 0.01 mol / L to 1 mol / L, the anode electrode being configured such that, during use of the PEM electrolytic cell, at least one surface of the substrate is exposed to the aqueous solution such that a corrosion resistant passivation film can be formed on the at least one surface when an anodic polarization potential of 1.4-2.5 VSHE is applied to the anode electrode, the passivation film includes nickel oxide and iron oxide, both making up at least 90% by mass of the passivation film. The invention further discloses a PEM electrolytic cell, a steel plate capable of being used for manufacturing the anode electrode for the PEM electrolytic cell and application of the steel plate.

The present application relates to an anode electrode for a PEM electrolyzer, and a method for producing hydrogen. An anode electrode for a PEM electrolyzer uses an aqueous solution containing perchlorate, a substrate of the anode electrode comprising, in terms of mass percentage, 22%≤Ni<80%, 95%≤Ni+Fe, and unavoidable impurities, and the aqueous solution containing perchlorate at a concentration of 0.01 mol / L to 1 mol / L; the anode electrode is configured such that, during use of the PEM electrolyzer, at least one surface of the substrate is exposed to the aqueous solution, so that when an anodic polarization potential of 1.4-2.5 VSHE is applied to the anode electrode, a corrosion-resistant passive film can be formed on at least one surface, the passive film comprising nickel oxide and iron oxide, which together account for at least 90% of the passive film in terms of mass percentage. The present application also discloses a PEM electrolyzer, and a steel plate capable of being used to manufacture an anode electrode for a PEM electrolyzer, as well as a use thereof.

The present invention belongs to the field of electrolysis devices, and discloses a graphite electrode fixed-bed plug flow reactor for electrolytic synthesis of succinic acid. This reactor has multiple functions such as heat exchange, graphite supplementation, and waste gas treatment. For the electrolytic synthesis of succinic acid, a graphite-filled fixed-bed electrode is used as the anode, and a cylindrical titanium electrode is used as the cathode. The electrolyte flow is in plug flow, and the applicable electrolyte temperature range is 20 - 90 °C; the applicable cathode current density is 100 - 1000 A / m 2 , and the applicable anode current density is 10 - 400 A / m 2 . Using maleic anhydride as the raw material for electrolytic synthesis of succinic acid, the current efficiency is greater than 90%. This reactor solves the disadvantages of the expensive iridium-titanium anode material in industrial electro-synthesis production of succinic acid, the easy corrosion of lead alloy anodes, and the difficulty in controlling the electrolyte temperature. By reducing the anode current density, the anode polarization is reduced, the cell voltage and power consumption are significantly reduced, and it can be applied to large-scale industrial electrolytic synthesis of succinic acid, having good industrialization value.

The invention relates to a method for rapidly determining technological parameters of a medium carbon steel EBSD sample prepared through electrolytic polishing. The technical problems that in mechanical polishing sample preparation, the preparation process is complex, and the influence of sample preparation quality on an EBSD detection result is large are mainly solved. According to the technical scheme, the method comprises the following steps that S1, a medium carbon steel material is cut into a square sample, the back face of the sample is connected with a wire, resin inlaying is conducted, and then the sample is polished to be flat from thick to thin through abrasive paper; s2, the sample is placed in an electrolytic polishing device, and the current-time relation and the anodic polarization curve of the material are measured; s3, after electrolysis is finished, measuring the surface roughness and the surface profile curve of the sample by using a surface roughness meter, and observing the surface of the sample by using a Tsai scanning electron microscope; and S4, based on the Jacquet mucous membrane model, a current-electrolysis time curve is drawn in combination with the current-time relation and the anodic polarization curve, the optimal electrolysis time is obtained, and therefore the optimal technological parameters of electrolytic polishing of the medium carbon steel used in the experiment are obtained.

The invention discloses a pulse reversal-electroosmosis synergistic dechlorination system and method for bridge reinforced concrete, and relates to the technical field of corrosion prevention of reinforced concrete structures. The invention aims to solve the problems of large anode polarization, high steel bar secondary corrosion risk, difficulty in quantification of dechlorination efficiency, large anode rigidity, incapability of fitting a complex structure, no quantitative standard of regeneration efficiency, high anode cost, difficulty in replacement and no derivation basis of service life in the existing constant direct-current electric field dechlorination technology. Through optimization of pulse inversion parameters and electro-osmosis collaborative design, a chloride ion migration amount formula is established, efficient migration of chloride ions is achieved, and the stability of steel bars is guaranteed; the resource circulation value is quantitatively evaluated, and the cost and environment burden are reduced; a dissoluble chitosan frame is designed, an anode service life formula is deduced, automatic disintegration and overall replacement within 24 hours after the anode is used up are achieved, a universal and quantifiable dechlorination system is constructed, and the full demand from efficient dechlorination to low-cost maintenance is met through multi-technology cooperation and formulation evaluation.

Provided is a method for producing an anode that does not easily cause an anode effect even when used in the electrolytic synthesis of fluorine gas by electrolysis of an electrolyte solution containing hydrogen fluoride and a metal fluoride. This method for producing an anode for fluorine gas electrolytic synthesis is provided with an anode polarization treatment step. The present invention provides a method for manufacturing a lithium ion secondary battery, the method comprising an anodic polarization treatment step in which an anode base material having a carbon material is immersed as an anode (21) and a cathode (22) is immersed in a mixed solution (10) for manufacturing an anode containing hydrogen fluoride, a metal fluoride, and potassium hexafluoronickelate, and an electric current is passed between the anode (21) and the cathode (22) to perform anodic polarization treatment of the anode base material. And a step for adhering nickel fluoride to the surface of the anode base.

This invention discloses a wide-voltage energy storage system based on quantum dot polarized electrets, belonging to the field of energy storage system technology. The energy storage system includes a quantum dot polarized electret energy storage unit, a series boost module, a charge / discharge control module, and a safety protection module. The quantum dot polarized electret energy storage unit consists of an anode-polarized carbon quantum dot electret positive electrode, a solid insulating layer, and a cathode-polarized silicon oxide quantum dot electret negative electrode. Stable electret charge and a built-in electric field are formed through bidirectional polarization, achieving wide-voltage energy storage. The series boost module connects multiple energy storage units in series, enabling flexible adjustment of the operating voltage from 0.1V to theoretically infinite voltage. The charge / discharge control module adjusts charge / discharge parameters, and the safety protection module ensures system safety. This invention can adapt to various high-voltage and extreme environment energy storage needs.

The invention discloses a composite reference electrode and a preparation method thereof, and relates to the technical field of reference electrodes. According to the method, firstly, a silver bar / silver mesh composite substrate is prepared through blue laser welding, so that the specific surface area is increased; then, a rare earth-nano particle doped silver halide functional layer is formed on the substrate through a melt impregnation and anodic polarization process, and the structural stability and ionic conductivity of the silver halide functional layer are enhanced. Secondly, preparing double-ion imprinted polymer powder capable of specifically capturing sulfur ions and heavy metal ions, and compounding the double-ion imprinted polymer powder with sulfonated polyether ether ketone, thiolated graphene oxide, imidazole ionic liquid and other components to prepare interface strengthening slurry; and finally, carrying out oxygen plasma treatment on an electrode, coating the slurry, and carrying out curing, heat treatment and activation to obtain a finished product electrode. The reference electrode prepared by the method has good foreign ion interference resistance.

The application discloses a kind of 0.1V to infinite high voltage bidirectional polarization quantum dot energy storage method and charge-discharge control method, belong to energy storage material technical field.Energy storage method includes: carbon quantum dot electrode is anodized, silicon oxide quantum dot electrode is cathodized, solid insulation layer is set between two poles to form electric field isolation, energy storage is realized by polarization charge trap and interface electrostatic field, work voltage is infinitely promoted by device unit series connection stacking, stable charge-discharge and high power output are maintained in 0.1V to infinite high voltage interval.Charge-discharge control method realizes low-voltage start, high-voltage energy storage and stable discharge by adjusting charging voltage and current and matching series connection unit quantity, and avoids performance degradation under high voltage.The application breaks through the voltage limit of traditional energy storage method, has high energy storage efficiency, fast charge-discharge speed and strong safety, and can be widely applied to various high-voltage energy storage scenes, to solve the technical problems of low voltage upper limit and complex control of existing energy storage method.

This invention discloses a method for reducing DC power consumption by adjusting the anode polarization potential in copper electrolysis. The method involves adding additive A and an anode polarization potential-reducing additive during electrolysis. The concentration of the anode polarization potential-reducing additive is adjusted according to voltage changes in the electrolytic cell during electrolysis to suppress anode passivation and simultaneously accelerate the cuprous ion to copper ion reaction rate, thereby reducing the anode polarization potential and ensuring normal copper electrolysis while reducing DC power consumption. This invention uses organic additives to suppress anode passivation and accelerate the cuprous ion to copper ion reaction rate to reduce the anode polarization potential, thus achieving the goal of reducing DC power consumption. It has advantages such as simple operation, wide adaptability, and significant power consumption reduction effect.

The invention provides a graphene / AlSi10Mg air battery based on in-situ auxiliary cold spraying additive manufacturing and a preparation method of the graphene / AlSi10Mg air battery. AlSi10Mg alloy powder is used as a matrix, the surface of the AlSi10Mg alloy powder is uniformly coated with graphene through a chemical reduction method, and an alloy block is prepared in combination with a cold spraying deposition technology and used for an air electrode anode. In the preparation process, stainless steel shots are added to achieve in-situ compaction, and the compactness of the alloy is remarkably improved. The graphene forms a three-dimensional conductive network which is used as a conductive medium to fill a passive film insulation gap, and the anode activity is enhanced by promoting an aluminum corrosion reaction, so that the reduction of the battery rate is inhibited. In-situ tamping is achieved, alloy structure micro-nano and matrix strengthening are achieved at the same time, and electrode mechanical and electrochemical performance is optimized. The anode shows excellent anode polarization characteristics and stable multiplying power in battery operation, and the problem of activity attenuation caused by passive film shielding of a traditional aluminum alloy electrode is effectively solved.

The invention provides a metal material intergranular corrosion sensitivity detection method, and relates to metal material corrosion performance testing, and the method comprises the following steps: placing a three-electrode system in an electrolyte, then applying an anodic polarization potential, and recording a current-potential curve; wherein a working electrode in the three-electrode system is a metal material to be detected; obtaining the maximum activation current density ia and the average reactivation current density ir according to the current-potential curve; the ratio of the average reactivation current density ir to the maximum reactivation current density ia is calculated, the reactivation rate Ra is obtained, and the intergranular corrosion sensitivity of the metal material is judged through the reactivation rate Ra. It needs to be explained that the intercrystalline corrosion sensitivity of the metal material is detected on the basis of the electrochemical anodic polarization technology, operation is easy, and the testing time is shortened from 48 hours to 1 hour or less.

The invention relates to the technical field of material testing, and particularly discloses a method for testing the corrosion performance of a SiC fiber reinforced titanium-based composite material in a marine environment, and the method comprises the following steps: preparation of a SiC fiber reinforced titanium-based composite material sample, soaking experiment, electrochemical test and microstructure analysis. The corrosion performance of the SiC fiber reinforced titanium-based composite material in different marine environments can be comprehensively and accurately evaluated. Through soaking experiments and electrochemical tests, the corrosion rate, electrochemical impedance, anodic polarization curve and other parameters of the SiC fiber reinforced titanium-based composite material can be obtained, and more scientific data support is provided for related research. Meanwhile, by adopting different microanalysis methods, corrosion mechanisms in different marine environments can be further researched, and more reliable data support is provided for application of the SiC fiber reinforced titanium-based composite material in the field of marine engineering.

The purpose of the present disclosure is to provide: a basic subcritical water composition capable of decomposing polymers and the like while suppressing corrosion of a reactor apparatus; a water-containing composition; a device; and a container. The present disclosure involves a basic subcritical water composition having a pH of 13.7 or less and a potential of 400 mV or more when the current density exceeds 10 mA / cm2 in an anodic polarization curve when using a steel material as a test electrode.