231 results about "Corrosion potential" patented technology

The invention discloses a ZnFeP-particle gradient abrasion-resistant chemical composite coating and a preparation method of the ZnFeP-particle gradient abrasion-resistant chemical composite coating. The ZnFeP-particle gradient abrasion-resistant chemical composite coating is divided into a passivation layer, a low-iron ZnFeP-particle chemical composite coating and a high-iron ZnFeP-particle chemical composite coating from outside to inside, and a gradient coating with the corrosion potential from low to high is formed; the content of iron in the low-iron ZnFeP-particle chemical composite coating ranges from 0.03 wt% to 1.0 wt%, the thickness of the low-iron ZnFeP-particle chemical composite coating ranges from 8 micrometers to 18 micrometers, and the hardness of the low-iron ZnFeP-particle chemical composite coating ranges from 150 HV to 300 HV. The content of iron in the high-iron ZnFeP-particle chemical composite coating ranges from 5 wt% to 30 wt%, the thickness ranges from 8 micrometers to 18 micrometers, and the hardness ranges from 500 HV to 650 HV. By means of the ZnFeP-particle gradient abrasion-resistant chemical composite coating, a metal component can be resistant to abrasion and corrosion, and therefore the service capacity of the metal component such as electric power fittings in the abrasion working condition is obviously improved.

The invention relates to the technical field of stress corrosion, in particular to a titanium alloy stress corrosion multi-scale modeling calculation method which comprises the following specific steps: S1, calculating to obtain physical property parameters of a titanium alloy; s2, calculating to obtain an equilibrium potential parameter; s3, testing to obtain a stress-strain curve and electrochemical parameters of the titanium alloy; s4, a titanium alloy stress corrosion two-dimensional model is established, a physical field is established according to the parameters obtained in the S1, the S2 and the S3 and the two-dimensional model, then a physical control equation is established, then the model is solved after boundary conditions are applied to the model, and finally a corrosion potential, stress and current density distribution cloud chart is obtained. According to the method, the stress corrosion model under different strains is obtained by taking the front-end calculation result as the input of multi-physics field finite element analysis on the basis of the calculation phase diagram model and the experiment and combining the basic theoretical models of the microscale and the mesoscale, so that the problems of long period and relatively high time cost and material cost of the stress corrosion experiment of the titanium alloy are solved.

The invention belongs to the technical field of corrosion and protection simulation analysis, and particularly relates to a multi-physics coupling corrosion simulation method for a metal material in a seawater environment, which comprises the following steps: firstly, carrying out stress and deformation calculation on a structure, and then, carrying out analysis fitting on a polarization test result of the material according to the electrochemical corrosion condition of the structure in seawater, so as to obtain a simulation result; and finally, according to the mutual influence effect between stress and electrochemistry, establishing a coupling path, realizing multi-physics coupling simulation, and quickly calculating to obtain the corrosion potential and the corrosion current density on the surface of the structure and the corrosion rates at different positions, thereby determining the most sensitive position of corrosion. By establishing an independent simulation boundary module database, rapid calling and reading of simulation boundary parameters are achieved, rapid iterative calculation of long-period corrosion evolution is achieved, corrosion evaluation efficiency is greatly improved, and the problems that in the equipment service process, seawater corrosion prediction precision is low, and the test period is long are effectively solved.

The present invention relates to a method for dynamically controlling corrosion in a steam- water circuit of a nuclear power plant, the method comprising: injecting the compounds ethanolamine and optionally ammonia, the system comprising: injection units, located at a dosing point and configured for injecting the compounds ethanolamine and ammonia in the fluid circulating in the circuit; and measurement units, configured for measuring a value of the parameters pH and at least one of the parameters selected from redox potential and corrosion potential in the circuit; the system being characterized in that it further comprises a control unit, the control unit comprising: a first acquisition module, connected to the measurement unit and configured for acquiring the measured values of the parameters and configured for acquiring at least one set-point value for said parameters; a command module, connected to the injection units and configured for commanding the injection of the compounds ethanolamine and ammonia by the injection unit as a function of the acquired at least one set-point value and measured values of the parameters, characterized in that ethanolamine is used as reducing agent. The present invention further relates to a system for dynamically controlling corrosion in a steam-water circuit of a nuclear power plant.

The invention relates to the technical field of conductive corrosion-resistant coatings for metal bipolar plates of hydrogen fuel cells, and discloses a conductive corrosion-resistant silver-doped titanium nitride coating for a metal bipolar plate as well as preparation and application of the conductive corrosion-resistant silver-doped titanium nitride coating. The conductive corrosion-resistant silver-doped titanium nitride coating for the metal bipolar plate is formed by sequentially stacking a pure Ti transition layer, a silver-doped titanium nitride coating and a pure titanium nitride covering layer. According to the conductive corrosion-resistant silver-doped titanium nitride coating for the metal bipolar plate, silver can be stably and uniformly distributed in the titanium nitride coating, a conductive path is formed, the contact resistance of the coating is reduced, the titanium nitride coating forms a compact structure, the corrosion resistance and the surface hydrophobicity of the titanium nitride coating are enhanced, and the service life of the coating is prolonged. The surface contact resistance can reach 4.18 m omega.cm < 2 >, the corrosion current density can reach 0.59 mu A.cm < 2 >, the corrosion potential can reach 0.08 V, and the water contact angle can reach 106.70 degrees.

The invention provides a synchronous electrochemical test and hydrogen evolution test experimental device and method, and belongs to the field of metal corrosion research. The experimental device provided by the invention comprises a hydrogen evolution test module, an electrochemical test module and a control system module, and the control system module controls the hydrogen evolution test module and the electrochemical test module to work through circuit connection. By combining the hydrogen evolution test and the electrochemical test, the automatic accurate measurement of the hydrogen evolution amount in the metal corrosion process can be realized, the measurement of the corrosion rate, the corrosion potential and the charge transfer amount in the oxidation-reduction reaction can also be realized, and the problems of poor sustainability and low precision of the traditional hydrogen evolution test method are avoided; the hydrogen evolution test data and the electrochemical test data are automatically obtained while one-time sample preparation is realized.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

The present invention relates to the technical field of electric power safety protection, and particularly relates to a method for monitoring and evaluating the corrosion state of a grounding grid. The method comprises the steps of: acquiring a soil environment pH value of a grounding grid region; acquiring a soil Cl ion concentration of the grounding grid region; acquiring a corrosion potential of the grounding grid region; acquiring a corrosion rate of the grounding grid region; and on the basis of a soil resistivity, the soil environment pH value, the soil Cl ion concentration, the corrosion potential and the corrosion rate, determining the corrosion state of a grounding grid. Thus, by means of introducing determination parameters of a soil resistivity, a soil environment pH value and a soil Cl ion concentration, the corrosion state of a grounding grid can be more accurately determined and evaluated, such that the operational safety and service life of a substation grounding grid are more effectively evaluated, thereby providing technical support for electric power operation and maintenance personnel to take more scientific and rational maintenance measures.

The invention provides an anodic oxidation passivation method of a neodymium-iron-boron permanent magnet zinc coating, which comprises the following steps of: performing electrochemical anodic oxidation by taking a neodymium-iron-boron permanent magnet with a zinc coating on the surface as an anode, a Pt sheet as a cathode and a passivation solution as an electrolyte, forming a passivation layer on the surface of the neodymium-iron-boron permanent magnet with the zinc coating on the surface, and cleaning and drying to obtain the neodymium-iron-boron permanent magnet with the zinc coating on the surface. A chromium-free passivation film is formed on the neodymium-iron-boron permanent magnet zinc coating, and passivation of the neodymium-iron-boron permanent magnet zinc coating is completed; the passivation solution is prepared from 10 g / L to 20 g / L of molybdate, 10 g / L to 15 g / L of ammonium fluozirconate, 1 g / L to 10 g / L of etidronic acid, 1 g / L to 10 g / L of sodium dihydrogen phosphate, 1 g / L to 10 g / L of nitric acid, 1 g / L to 10 g / L of phosphoric acid and the balance distilled water. According to the method disclosed by the invention, a complete, uniform and compact passivation film is formed on the surface of the zinc coating after passivation, the corrosion potential is improved while the corrosion current is effectively reduced, and the time for generating a rust spot in a salt spray test exceeds 72 hours.

The invention relates to a metal contact corrosion evaluation method and system based on a Tafel polarization curve, and the method comprises the steps: installing a to-be-evaluated sample in an electrochemical testing device, and simulating the corrosion condition of a working environment; carrying out linear polarization scanning on the to-be-evaluated sample by adopting an electrochemical workstation, recording changes of electrode potential and current density, and generating a Tafel polarization curve; a strong polarization interval is selected according to the measured Tafel polarization curve data, and Tafel curves of the anode and the cathode are obtained through mathematical fitting; and calculating the corrosion potential and the corrosion current density based on the Tafel curves of the anode and the cathode obtained by fitting. Compared with the prior art, through accurate mathematical fitting and calculation, the accuracy and reliability of corrosion parameters are ensured, and the corrosion tendency and corrosion rate of the metal material can be accurately evaluated. And an effective technical means is provided for evaluating the corrosion performance of the metal material.

The utility model provides an electronic device which comprises a first structural member and a second structural member, the first structural member comprises a first metal matrix, the second structural member comprises a second metal matrix and a decoration layer arranged on one side of the second metal matrix, and the first metal matrix is electrically connected with the second metal matrix. The corrosion potential of the first metal matrix is lower than that of the second metal matrix; an insulating layer is further arranged on the side, away from the second metal base body, of the decorative layer, the insulating layer is a transparent or semitransparent layer, and the impedance of the insulating layer is larger than or equal to 2000 ohms. The insulating layer is arranged on the decorative layer on the second metal matrix with high corrosion potential, so that a potential difference caused by a closed loop formed between the metal matrixes with different chemical activities can be prevented in a sweat environment or a salt mist environment, and the probability of electrocorrosion of the first metal matrix with low corrosion potential is further reduced; and the long-term use requirement of the electronic equipment is well met.

The invention relates to a simulation method for predicting the morphology of a corrosion pit by considering grain orientation, and belongs to the technical field of metal material calculation and simulation. The method comprises the following steps: firstly, constructing a model that an initial corrosion pit exists on the surface of a material and importing EBSD data of the material, secondly, setting a boundary condition and a control equation, introducing a relationship between crystal orientation and corrosion potential, and finally simulating movement of a corrosion pit interface in a corrosion process to predict the morphology of the corrosion pit. According to the method, by considering the influence of the actual crystal structure of the material on the pitting behavior, the obtained simulation result can be used for predicting the morphology of the pitting pit, and reference is provided for researching more complex corrosion phenomena involving a series of microstructure characteristics and various electrochemical mechanisms.

The invention discloses an alloy structure optimization design manufacturing method and device, and the method comprises the steps: regulating and controlling an alloy microstructure, surface free energy parameters, a corrosion environment and stress boundary conditions through a numerical simulation method, and calculating the corrosion potential, corrosion current density and charge transfer resistance of an alloy under different conditions; establishing a quantitative relationship among the alloy microstructure, the surface free energy and the corrosion resistance; according to the target microstructure parameters, an alloy with a target microstructure is constructed through 3D printing; the super-hydrophobic alloy is prepared by utilizing a pretreatment condition and a fluorosilane modification condition; analyzing the influence rules of 3D printing conditions, pretreatment conditions and fluorosilane modification conditions on the microstructure, surface free energy and hydrophobicity of the alloy; and alloy preparation conditions are optimized according to the influence rule. Theoretical simulation and experiments are combined to clarify the internal relation among the construction method-microstructure and surface free energy-hydrophobicity-corrosion resistance of the corrosion-resistant alloy, and the corrosion resistance of the alloy structure is improved.

The invention discloses an iron-based amorphous alloy suitable for a marine environment and a method for preparing a coating based on the iron-based amorphous alloy. The chemical formula of the iron-based amorphous alloy is Fe < 35 > Ni < 20-x > Cr < 20 > Mo < 5 > B < 4 > C < 4 > P < 12 > Ce < x >, wherein the value of x ranges from 0.5 to 1.5. On the basis of the iron-based amorphous alloy, a coating formed by adopting a high velocity oxy-fuel spraying mode not only has good seawater corrosion resistance, but also has good microbial corrosion resistance; after the coating is soaked in a culture medium solution inoculated with pseudomonas aeruginosa for 14 days, the self-corrosion potential is-314 mV, the self-corrosion current density is 5.9 [mu] A cm <-2 >, the passivation interval exceeds 1200 mV, and the passivation current density is 5.1 [mu] A cm <-2 >.

The invention discloses an evaluation and life prediction method for a fuel cell metal pole plate coating, and belongs to the technical field of fuel cell testing. The method is used for predicting the service life under the condition of simulating the working condition of the fuel cell, and comprises the following steps: firstly, determining the corrosion potential of a fuel cell metal pole plate coating through potentiodynamic scanning; the method comprises the following steps: taking a corrosion potential as a starting point, slowly increasing the potential in an operation environment close to a cathode of a fuel cell, continuously scanning until electrochemical corrosion occurs or the potential reaches 1.6-3.0 V (vs.RHE), and finally measuring the contact resistance change of the sample under the pressure of 1.4 MPa for predicting the service life of a pole plate coating in the operation environment of the fuel cell. The attenuation of the pole plate coating in the long-time operation process of the fuel cell is estimated through the change of the contact resistance of the pole plate, including the calculation of the corrosion rate of the coating in the operation environment of the fuel cell and the like, so that the prediction result of the service life is obtained.

The invention provides a method for evaluating the corrosion behavior of a small hole of an anticorrosive coating under the action of current. The method comprises the following steps: (1) acquiring corrosion kinetic parameters of a metal material; (2) constructing a parameterized multi-physical field model; (3) simulating a corrosion evolution process; (4) verifying the reliability of the model through experiments; and (5) constructing a comprehensive evaluation index. Obtaining corrosion kinetic parameters (corrosion potential, corrosion current density, Tafel slope and exchange current density) of the metal material through a potentiodynamic polarization curve test; the method comprises the following steps: preparing an anticorrosive coating metal sample with artificial pores, constructing a parameterized multi-physical field model by combining finite element software, and simulating local current density distribution and corrosion evolution under different pore diameters (greater than or equal to 2 mm), spacing (greater than or equal to 0 mm) and current density (greater than or equal to 0 A / m < 2 >); the reliability (corrosion potential error lt, 20%) of the model is verified through experiments, a comprehensive evaluation index is constructed based on multi-parameter sensitivity analysis, and rapid evaluation of the corrosion risk of the small hole of the anticorrosive coating and protection scheme optimization are achieved.

The invention relates to the technical field of material testing, and discloses a material stress and micro-electrochemical in-situ corrosion potential testing device and a material stress and micro-electrochemical in-situ corrosion potential testing method. The invention provides an experimental device capable of simulating different stresses and actual test conditions and accurately evaluating the micro-area stress corrosion behavior of a material, and the stress corrosion and micro-area corrosion potential change rules of the material under different stress and electrochemical coupling effects are visually measured in situ. And a technical support is provided for revealing a stress corrosion mechanism in a metal material service environment. Meanwhile, different sample test requirements of a plurality of material product production lines are considered, high-accuracy and high-flexibility adjustment of multiple test conditions is realized, and by planning a scientific and reasonable sample test distribution strategy, the test frequency requirement of parallel task test of the multiple material product production lines and the test device switching target are met, and the test efficiency is improved. The efficiency and operation reliability of the test system are improved.

The invention relates to an L450 grade pipeline steel hot-rolled plate coil for ground gathering and transportation and a production method thereof. The chemical composition of the steel is C: 0.061%-0.070%, Si: 0.15%-0.25%, Mn: 0.39%-0.48%, P≤0.012%, S: 0.0028%-0.003%, Als: 0.030%-0.045%, Nb: 0.032%-0.038%, Ti: 0.020%-0.023%, Cu: 0.34%-0.42%, Cr: 0.32%-0.39%, N≤0.004%, and the remainder is iron and impurities. The yield strength of the hot-rolled coil product is 465-478 MPa, the tensile strength is 572-588 MPa, the elongation after fracture is ≥36.5%; the Charpy impact energy Akv at -40°C is ≥308 J; the corrosion rate is 0.0234-0.0270 mm / a, the corrosion potential is ≥-0.452 V, and the corrosion current density is ≤1.06×10 ‑5 A.cm ‑2 .

To provide a reliability improvement method of a nuclear power plant capable of improving the reliability of a nuclear power plant by using corrosion potential as continuous monitoring indicators as a performance indicator of reliability-oriented maintenance processes.SOLUTION: A disclosed reliability improvement method of a nuclear power plant P100 includes: a selection step S1 of selecting a device or part with a high risk of stress corrosion cracking as a device or part that is of high importance for maintenance; a monitoring step S2 of monitoring the corrosion potential of the selected device or part that is of high importance for maintenance as a monitoring indicator and constantly monitoring the crack growth rate at the monitored area by using the corrosion potential based on water quality parameters and plant data during the driving cycle; and a preventive maintenance execution step S3 of determining the timing of the next preventive maintenance inspection by using the ratio of the constantly monitored crack growth rate and the estimated crack growth rate in the device or part with the high risk of stress corrosion cracking when continuous monitoring is not performed.SELECTED DRAWING: Figure 1

The present invention discloses a highly corrosion-resistant and highly conductive palladium-plated / gold-plated palladium-copper bonding wire and a production process thereof, and relates to the technical field of bonding wires. In order to improve the corrosion resistance of the bonding wire, the present invention improves the bonding wire by modifying the core material and preparing a composite coating. The present invention first improves the core layer, and by adding graphene to the core layer, the corrosion potential of the core material is greatly improved, and the copper core has good heat dissipation performance and high-temperature electrical conductivity, thereby avoiding heat accumulation and temperature rise in the bonding wire. On this basis, the present invention also improves the coating, and by reducing the metal ion concentration in the plating solution, adding a hole-filling agent, and performing pulse current electroplating, the surface morphology of the electroplated coating is improved, and by annealing, a diffusion layer is formed between the graphene copper alloy core and different electroplated layers, thereby improving the mutual bonding strength and improving the performance of the bonding wire.

The invention discloses a gradient polyaniline bionic anti-corrosion coating and a preparation method, and belongs to the technical field of metal surface anti-corrosion materials. A polyaniline composite system with a gradient conductive function is constructed by simulating the space electron transfer characteristic of a sulfur reducing bacteria biological membrane; comprising a low-oxidation-state polyaniline conducting layer, a semi-oxidation-state polyaniline transition layer and a high-oxidation-state polyaniline semiconductor layer which are arranged on the bottom layer, a continuous potential gradient is formed between the layers through oxidation degree differences, and a micro electric field opposite to a natural corrosion potential direction is generated on a metal matrix and a coating interface in an induced mode. A micro electric field formed by the conductive gradient of the coating effectively inhibits spontaneous migration of corrosion electrons, surface oxidation-state components compensate local potential difference through reversible oxidation-reduction reaction, and a bottom high-conductivity layer accelerates charge dissipation in the anode polarization process. The gradient polyaniline coating disclosed by the invention shows double protection effects of cathode protection and physical barrier on a metal substrate in hydrogen sulfide corrosion environments such as oil and gas conveying pipelines and ocean platforms.

The invention relates to the technical field of corrosion potential measurement methods, and provides a corrosion potential measurement method for an offshore steel structure, which is used for directly testing the corrosion potential of the offshore steel structure on a mother ship and can improve the efficiency and the working quality, and comprises the following steps of: connecting a measurement instrument with a large steel structure; a measuring end is led out from the surface of a large steel structure and connected with the negative electrode of a measuring instrument, the measuring instrument is connected through independently introducing a wire from the interior of a cable shaft, and one end of the wire is connected with a reference electrode on an ROV, so that the measuring instrument is connected with the reference electrode, an underwater robot is controlled, the reference electrode is brought to a set position, and ROV wiring and power supply are completed. The ROV body is put into water through a crane, the robot is controlled through an operation handle on the control box, the reference electrode is determined to be brought to a set position through ROV display data on a display screen of the control box, the potential difference of the two terminals is read through the measuring instrument, and the control box reads and displays the numerical value read by the measuring instrument.

The embodiment of the invention discloses a diamond-based composite wave-absorbing material. The method comprises the following steps: S1, carrying out graphitization treatment on the surfaces of nano-diamond particles to obtain graphitized diamond composite particles; s2, carrying out compression molding on the graphitized diamond composite particles to obtain a diamond-based composite wave-absorbing material green body; s3, the diamond-based composite wave-absorbing material green body is subjected to high-temperature and high-pressure treatment, and the diamond-based composite wave-absorbing material is obtained; the minimum reflection loss value of the diamond-based composite wave-absorbing material reaches-61.47 dB when the thickness is 5.5 mm, the maximum effective absorption bandwidth can reach 4.0 GHz when the thickness is 2.7 mm, the Vickers hardness ranges from 40 GPa to 60 GPa, the diamond-based composite wave-absorbing material belongs to a superhard material, the normal-temperature heat conductivity ranges from 3.4 W / m.K to 3.7 W / m.K, the initial oxidation temperature ranges from 1100 DEG C to 1250 DEG C, the corrosion current density ranges from 10 <-6 > A / cm < 2 > to 10 <-7 > A / cm < 2 >, the self-corrosion potential ranges from-200 mV to 0 mV, and the corrosion rate ranges from 0.001 mm / a to 0.005 mm / a. The material belongs to a corrosion-resistant material.

The invention provides Low-E coated glass and a preparation method thereof, and relates to the technical field of coated glass. The magnetron sputtering process is adopted for film coating, when the transparent conductive oxide located on the lower layer relative to the silver layer is sputtered, the oxygen flux of sputtering gas is improved, free oxygen is preset in the transparent conductive oxide layer, the top graphite film protection layer is arranged, the hydrophobicity and corrosion potential of the film layer are improved, and the abrasion resistance is improved. Heat treatment is carried out after film coating, so that preset free oxygen is diffused to a silver layer, a silver oxide micro-oxidation layer is formed, uniform distribution of the silver layer is promoted, the roughness of an Ag layer is reduced, and conductivity and transmittance are synchronously improved; the graphite layer is oxidized and removed, and stains and slight scratches on the surface of the graphite layer are eliminated together. Under the influence of heat treatment, the dielectric layers are regularly arranged, so that the compactness and surface hardness of the film are improved.

The four-layer aluminum alloy plate with the corrosion potential gradient layered distribution comprises a first skin layer, a middle layer, a core layer and a second skin layer which are sequentially stacked, and the first skin layer and the second skin layer are made of 4-series aluminum alloy; the alloy composition of the middle layer comprises the following components in percentage by weight: 0.5 to 1 percent of Si, 0.2 to 0.5 percent of Fe, 0.05 to 0.1 percent of Cu, 1.2 to 2 percent of Mn, 2 to 3 percent of Zn, less than or equal to 0.5 percent of Ti and the balance of aluminum; and the alloy composition of the core layer comprises the following components in percentage by weight: 0.5 to 1 percent of Si, 0.2 to 0.5 percent of Fe, 0.2 to 0.5 percent of Cu, 0.2 to 1 percent of Mn, 0.1 to 0.3 percent of Mg, less than or equal to 0.05 percent of Zn, less than or equal to 0.5 percent of Ti and the balance of aluminum. The preparation method comprises the steps of stacking alloy blocks and then carrying out hot rolling, intermediate annealing, cold rolling and finished product annealing, and the application of the alloy is that vacuum brazing is carried out at the temperature of 580-620 DEG C. According to the four-layer aluminum alloy plate, the mechanical property is improved, and meanwhile the corrosion resistance is achieved.

The invention discloses a high-corrosion-resistance high-conductivity electroplated palladium / gold-plated palladium-copper bonding wire and a production process thereof, and relates to the technical field of bonding wires, in order to improve the corrosion resistance of the bonding wire, the bonding wire is improved by modifying a core material and preparing a composite coating; according to the method, firstly, the core layer is improved, the corrosion potential of a core material is greatly improved by adding graphene into the core layer, the copper core has good heat dissipation performance and high-temperature conductivity, heat is prevented from being accumulated and heated in the bonding wire, and on the basis, the coating is improved, so that the corrosion resistance of the copper core is improved, and the service life of the copper core is prolonged. The surface appearance of an electroplating coating is improved by reducing the concentration of metal ions in an electroplating solution, increasing a pore filling agent and performing pulse current electroplating, diffusion layers are formed between the graphene copper alloy core and different electroplating layers through annealing treatment, the bonding strength between the graphene copper alloy core and the different electroplating layers is improved, and the use performance of the bonding wire is improved.

The invention discloses a preparation method of a high-strength corrosion-resistant copper alloy wire. The preparation method comprises the following steps: (1) preparing composite powder; (2) preparing pretreatment powder; (3) sensitization treatment and activation are carried out, surface chemical copper plating is carried out on the activated powder, and copper plating powder is obtained; (4) weighing copper powder, nickel powder, silicon powder and copper-plated powder, heating and melting, adding the copper-plated powder into the melt, casting and molding, heating to eliminate stress, cooling, and drawing into a copper alloy wire by using a wire drawing machine; and the copper alloy wire is subjected to heat preservation for 30 min at the temperature of 220 DEG C, then the temperature is increased to 300 DEG C, heat preservation aging is conducted for 3 h, furnace cooling is conducted to 200 DEG C or below after heat preservation is completed, then the copper alloy wire is taken out and subjected to air cooling to the normal temperature, and the high-strength corrosion-resistant copper alloy wire is obtained. The copper alloy casting prepared through the method has high tensile strength, and the prepared copper alloy wire is high in self-corrosion potential and shows good strength and corrosion resistance.

To provide an ammonia stress corrosion cracking (SCC) acceleration test method capable of evaluating ammonia stress corrosion cracking sensitivity of a metal material with excellent accuracy in a short period.SOLUTION: In an ammonia stress corrosion cracking acceleration test method, a metal test piece to which external stress is added or which has residual stress is immersed in ammonium carbamate of 0.01 mass% or more and liquid ammonia containing O2 of 0.002 to 0.200 bar at a gas partial pressure, and is polarized to more than +1.0 V relative to corrosion potential.SELECTED DRAWING: None

To provide a plant reliability evaluation system capable of improving the reliability of equipment including not only conventional equipment but also large structures such as structural materials and weld lines. by simultaneously utilizing in-service inspections and operating parameters of nuclear facilities in a plant.SOLUTION: A plant reliability evaluation system S comprises: a corrosion potential sensor 4; a first water quality measuring unit; a dose rate monitor; a detection unit 511 for taking these pieces of measurement data as environment information of a plant during operation; a storage unit for storing a material composition forming a nuclear reactor, deterioration data of the material, and inspection results; a soundness monitoring unit 514 for always monitoring soundness of equipment forming the plant, on the basis of environment information of the plant during operation, the environment information not being taken in reliability evaluation of equipment regulated by the Institute of Nuclear Power Operations in the United States; and a life cycle management unit 516 for planning a repair plan for the plant on the basis of the soundness evaluation result, and performing life cycle management.SELECTED DRAWING: Figure 6

The invention provides an electrochemical selective extraction process and device, and relates to the technical field of material extraction in the nuclear fuel circulation process, and the electrochemical selective extraction process comprises the following steps: respectively carrying out corrosion potential tests on an uncontaminated stainless steel sample and a stainless steel sample contaminated with nuclide; obtaining the corrosion potential a of the uncontaminated sample relative to the cathode and the corrosion potential b of the contaminated nuclide sample relative to the cathode; putting a to-be-treated metal workpiece of which the surface is adhered with a pollutant material into an anode basket of an electrochemical extraction device, and connecting the anode basket to an anode of a direct-current power supply or a potentiostat; mixing nitric acid, sodium nitrate, a corrosion inhibitor and a slow release agent to prepare an electrolyte; a cathode basket of the extraction device is connected with a negative electrode of a direct-current power supply or a potentiostat, an anode basket is nested in the cathode basket, and the anode basket and the cathode basket are jointly immersed in electrolyte for extraction. According to the method, pollutants adhering to the irregular metal surface are effectively removed and recycled, the extraction rate of contaminated metal nuclides reaches 99% or above, and the introduction amount of matrix elements is lower than 3500 ppm / g matrix.