75 results about "Microbial corrosion" patented technology

The invention provides a submarine pipeline corrosion rate prediction method, system and device and a medium, and the method comprises the steps: obtaining monitoring data along a target submarine pipeline and pipeline body data; constructing a microbial corrosion random kinetic model based on the monitoring data, and simulating and generating a random microbial corrosion current component; calculating a pipe wall temperature field which is non-uniformly distributed along the axial direction of the pipeline based on the monitoring data and the pipeline body data; calculating an electrochemical corrosion current component based on the pipe wall temperature field and the electrochemical parameters of the pipeline material; performing multi-physics field coupling calculation on the random microbial corrosion current component and the electrochemical corrosion current component to generate a corrosion space-time distribution field; and performing corrosion risk analysis based on the corrosion space-time distribution field to obtain a corrosion risk prediction result. The method can improve the corrosion prediction accuracy of the submarine pipeline.

Techniques for determining microbiological corrosion include flowing a mixed-phase wellbore fluid from at least one tank into a volume of a reactor tank of a microbiological corrosion reactor; controlling a multi-channel potentiostat coupled to a three-electrode cell assembly positioned in the volume, the three-electrode cell assembly including a working electrode, a counter electrode, and a reference electrode, where each of the working electrode, the counter electrode, and the reference electrode is positioned in the volume to contact the mixed-phase wellbore fluid; based on controlling the multi-channel potentiostat, activating the working electrode in the mixed-phase wellbore fluid in the volume; and determining, based on activating the working electrode, a corrosion rate of at least one of the working electrode or a target coupon positioned within the mixed-phase wellbore fluid in the volume.

The invention belongs to the technical field of austenitic stainless steel pipes, and particularly relates to an austenitic stainless steel pipe for a heat exchanger and a preparation method and application thereof. The austenitic stainless steel pipe for the heat exchanger comprises the following components in percentage by mass: less than or equal to 0.03% of C, less than or equal to 0.75% of Si, 3-6% of Mn, less than or equal to 0.04% of P, less than or equal to 0.03% of S, 16-19% of Cr, 4-7% of Ni, 2-4% of Mo, 1-3% of Cu, 0.3-0.6% of Hf, 0.2-0.5% of Ti, 0.1-0.3% of Co and the balance of Fe and inevitable impurities. The austenitic stainless steel pipe for the heat exchanger has excellent mechanical performance and is resistant to chloride ions and microbial corrosion.

The invention discloses an antibacterial peptide induced by sulfate reducing bacteria and application of the antibacterial peptide, and belongs to the technical field of marine corrosion protection. The amino acid sequence of the SRB-induced antibacterial peptide is VAHKRLVVGTR, and the SRB-induced antibacterial peptide has efficient antibacterial activity on corrosive bacteria such as SRB and has the advantages of being environmentally friendly and not prone to inducing the bacteria to generate drug resistance, and the problems that an existing antibacterial peptide is insufficient in corrosive bacteria specificity, poor in environmental stability and the like are solved; meanwhile, peptide chains are short, synthesis is easy, and the production cost is low; the compound corrosion inhibition bactericide formed by combining the compound with a chemical bactericide can significantly improve the antibacterial and antiseptic effects, saves the dosage of the chemical bactericide, effectively solves the problems of bacterial drug resistance, high cost, environmental pollution and other pain points caused by abuse of the existing bactericide, and is suitable for the fields of marine microbial corrosion protection and the like.

The utility model relates to the technical field of rotary joint equipment, and provides an impingement type water pipe rotary joint which comprises a sewer pipe and an impingement water pipe body, and a connector body is arranged on the inner wall, close to the bottom, of the sewer pipe. A worker rotationally connects a sewer pipe internal connector body with a threaded groove in the surface of an impact water pipe body, then a handle is rotated to drive a rotating wheel to synchronously rotate through a rotating shaft, the rotating wheel rotates to enable a threaded rod to rotate through a nut disc, and the threaded rod rotates to promote a fixing block close to the nut disc to move towards the other fixing block; the fixed block moves and drives the surface of the soft leather sheath to clamp the impact water pipe body, so that the problems that the service life of each connector capable of changing the direction is extremely short under the impact of the impact water pipe, the connector is not damaged by washing, that is, a slippery wire on the inner wall is corroded by microorganisms in water flow, and the service life is short are solved; therefore, the problem that the worker needs to check and replace the joint ceaselessly is solved.

The invention belongs to the technical field of marine corrosion and protection, and discloses an antibacterial peptide for marine corrosion prevention and fouling prevention and application of the antibacterial peptide, the sequence of the antibacterial peptide is H-NIle-NVal-NLys-NLU-NPhe-NLU-NTyr-NArg-NSer-NTrp-NLU-NHis-NLU-NLU-NIle-NH2, the antibacterial and preservative effects of common corrosion inhibition bactericides such as quaternary ammonium salts, organic guanidines and aldehydes can be effectively enhanced, and the antibacterial peptide can be applied to marine corrosion prevention and fouling prevention. The generation of a corrosive biological membrane and the microbial corrosion rate can be effectively inhibited, the dosage of a bactericide can be reduced by 60% or above, and continuous antibacterial and anticorrosion for 30 days can be realized.

The invention discloses a preparation method of a tobacco stem extract and application of the tobacco stem extract as a microbial corrosion inhibitor, and belongs to the field of metal microbial corrosion and protection.The preparation method comprises the steps that collected tobacco stems are cleaned, aired and ground into powder to obtain tobacco stem powder, the tobacco stem powder is dispersed in an ethanol water solution to be soaked, then the solution is filtered, and filtrate is concentrated; and drying to obtain the tobacco stem extract. Antibacterial and corrosion characterization experiments prove that when the concentration of the tobacco stem extract reaches 200mg / L, a broad-spectrum antibacterial effect on gram-negative bacteria and gram-positive bacteria can be achieved, initial adhesion of microorganisms on the metal surface is effectively inhibited, a formed mature biofilm is eliminated, and an obvious inhibition effect on microbial corrosion is achieved. The raw materials of the tobacco stem extract are cheap and easy to obtain, the preparation method is simple, the process is green and environment-friendly, the antibacterial and corrosion inhibition effects are remarkable, and efficient prevention and control of metal material microbial corrosion in the environment can be achieved.

This invention relates to the field of chemical additives for oil and gas field development. It discloses an oil and gas field bactericide and its preparation method, comprising the following components by mass percentage: glutaraldehyde 8%-18%; quaternary ammonium salt 12%-22%; disodium ethylenediaminetetraacetate 2%-6%; polyethylene glycol 400 1%-3%; and the balance being water. The quaternary ammonium salt is a mixture of dodecyl dimethyl benzyl ammonium chloride and disedecyl dimethyl ammonium chloride in a mass ratio of 1.5:1-2.5:1. This invention, through synergistic compounding of multiple components, significantly improves the stability of the bactericide under high temperature, high mineralization, and weakly alkaline environments, achieving an active substance retention rate of ≥92% after 72 hours. This solves the problems of easy degradation of glutaraldehyde and poor stability of conventional formulations. The product has a broad bactericidal spectrum and good long-lasting effect, with low concentrations effective against three key types of bacteria, inhibiting microbial corrosion and blockage. The compounded system is less prone to drug resistance, and the preparation process is mild and simple, suitable for industrial production, and can meet the long-term stable bactericidal requirements of oil and gas fields.

The invention discloses a method for accelerating weathering and soil formation of waste concrete by microbial fermentation, which comprises the following steps: crushing the waste concrete into blocks with the particle size of 20-50cm, retaining the fracture structure of the blocks, mixing the concrete blocks with biomass, adding 0.3-0.5% of compound microbial agent which specifically comprises acid-producing bacteria, cellulose degrading bacteria and silicate weathering bacteria into the mixed material, and uniformly stirring to obtain a mixture; composting the mixed material, controlling the temperature of the pile body to be 40-55 DEG C, maintaining for at least 15 days, and gradually decomposing the concrete block body by utilizing the synergistic biological weathering effect of organic acid generated by microbial metabolism and the microbial corrosion effect in the fermentation process. According to the method disclosed by the invention, the dynamic bottleneck of decomposition of calcium silicate minerals in concrete blocks is broken through by virtue of synergistic fermentation of the composite flora and the biomass and the coupling effect of organic acid release and biological erosion, and the crushing energy consumption is reduced compared with that of a traditional fine crushing process; and a novel green conversion method integrating rapid soil formation, nutrient activation and pollution prevention and control is formed.

The application discloses an anti-microbial corrosion steel based on a vacancy catalysis mechanism for enhancing ROS generation and a preparation method thereof, and relates to the technical field of corrosion-resistant steel materials.The anti-microbial corrosion steel provided by the application contains copper and rare earth elements (for example, Ce, etc.), and through a vacancy catalysis effect, the dissolution of the copper and the rare earth elements in the anti-microbial corrosion steel is promoted, and the generation of ROS is accelerated through an electric charge transfer mechanism, so that the anti-microbial corrosion performance of the anti-microbial corrosion steel is improved; the rare earth elements change the d-band structure of the copper, adjust the electron density of the copper, enhance the redox reaction activity of the copper, and then accelerate the generation of ROS.

The invention belongs to the technical field of corrosion resistance testing, and particularly relates to a corrosion resistance testing system for a multi-layer composite armored grounding device, which comprises an environment simulation module used for firstly constructing a soil simulation environment and then performing gas simulation in the soil simulation environment; the corrosion factor control module is used for controlling soil acidity and alkalinity, stray current and microbial corrosion; and the data monitoring and acquisition module is used for detecting corrosion degree, performance parameters and environmental parameters. A soil simulation environment is constructed through the environment simulation module, the gas simulation unit is arranged, meanwhile, the corrosion factor control module is used for simulating various factors such as soil acidity and alkalinity, stray current and microbial corrosion, and the synergistic effect of various corrosion factors in complex environments such as a chemical industry park can be comprehensively simulated.

The present application discloses a low alloy steel, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C: 0.02-0.1%, Si: 0.1-1.5%, Mn: 0.10-1.8%, Cr: 1.0-5.5%, Ni: 0.3-3.0%, Cu: 0.3-4.8%, Mo: 0.10-2.5%, V: 0.01-0.2%, Al: 0.01-0.1%, REM: 0.1-1.0%. The low alloy steel of the present disclosure has good resistance to carbon dioxide and microbiologically caused corrosion and is suitable for working environments where microbiologically caused corrosion and CO2 corrosion coexist. In addition, the present application discloses a plate and a welded pipe made from the low alloy steel, and methods for manufacturing the plate and welded pipe.

The embodiment of the invention provides a preparation method of a heat storage material based on microbial corrosion and energy field regulation and a material. The method comprises the following steps: mixing distilled water, magnesium chloride, sodium carbonate and sodium hydroxide to prepare slurry; the method comprises the following steps: selecting silicophilic bacillus licheniformis as a silicate rock degradation strain, and inoculating the silicophilic bacillus licheniformis into a culture medium containing silicate rock chips for culturing; adding the obtained silicophilic bacillus licheniformis culture solution into a solution containing silicate rock debris to obtain activated silicate rock debris; mixing the activated silicate rock debris with a binder to prepare a green body, so as to obtain a pre-oxidized active material; putting the magnesium oxide active powder into a high-vacuum hot-pressing furnace, and synthesizing nano whiskers; calcining the obtained nano crystal whiskers to obtain core material nano crystal whiskers, mixing the core material nano crystal whiskers with a binder, and performing granulation, drying and compression molding to obtain a biscuit; putting the biscuit into a tubular furnace, and carrying out heating and heat preservation treatment; putting the cooled biscuit into a graphite mold, and sintering to obtain a biscuit; the biscuit is treated through an impregnation method, and the heat storage material is prepared.

The invention belongs to the field of novel corrosion-resistant materials for engineering facilities and equipment in a marine environment, has double functions of corrosion resistance and microorganism resistance, and relates to corrosion-resistant and microorganism-resistant double-function austenitic stainless steel containing rare earth element La as well as preparation and application of the corrosion-resistant and microorganism-resistant double-function austenitic stainless steel. The stainless steel comprises the following chemical components in percentage by weight: 19.5-20.5% of Cr, 17.5-18.5% of Ni, 5.5-6.5% of Mo, 0.75-0.85% of Cu, 0.5-2.0% of La, 0.18-0.22% of N, less than or equal to 0.03% of C, less than or equal to 0.5% of S i, less than or equal to 0.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable trace impurities, and PREN =% Cr + 3.3 *% Mo + 16 *% N > = 45.

The application belongs to the field of building materials, and particularly relates to a preparation method of an in-situ polymerization modified cement with lead-zinc tailings and anti-microbial corrosion. The preparation method of the modified cement comprises the following steps: dissolving initiators and cross-linking agents in water, and then placing the mixture in a constant temperature environment to obtain a mixed solution; dissolving water-reducing agents, polymer monomers and sodium carbonate in water, and then placing the mixture in a constant temperature environment to obtain a mixed solution; uniformly mixing Portland cement and lead-zinc tailings, and then placing the mixture to obtain a mixed powder; mixing the mixed powder and the mixed solution in a stirrer at a low speed, adding the mixed solution, stirring to obtain a mixed slurry, and then shaping and curing to obtain the in-situ polymerization modified cement with lead-zinc tailings and anti-microbial corrosion. Compared with the prior art, the application uses heavy metal solid waste which is difficult to be reused to replace traditional bactericides, reduces the cost of the anti-microbial corrosion cement, shortens the test period through empirical formula calculation, forms a double anti-microbial corrosion path of early polymer protection and late heavy metal ion inhibition, and improves the anti-microbial corrosion effect.

The application discloses a kind of ground gathering and transferring pipeline corrosion inhibitor, including the following components by weight percentage: corrosion inhibitor main agent 10-45%, bactericide 5-25%, oxygen scavenger 5-10% and solvent 40-55%.A kind of ground gathering and transferring pipeline corrosion inhibitor preparation method is also provided, including the following steps: (1) as needed in reaction kettle, then add ethanol, stirring is uniform, to obtain solvent;(2) corrosion inhibitor main agent, bactericide and oxygen scavenger are sequentially added to solvent, heated to 50-60 DEG C, uniformly stirred 0.5-1.5h after gradually cooling down, to obtain ground gathering and transferring pipeline corrosion inhibitor.The application can effectively reduce the cell number of sulfate-reducing bacteria and iron bacteria, can reduce the corrosion of microorganism to pipeline and play better corrosion inhibition effect, thereby effectively solve the problem that gathering and transferring pipeline laid on ground in different environments is easily corroded, especially easily corroded by microorganism.

The invention discloses a compounding method and application of a borate microbial corrosion inhibitor, and belongs to the technical field of metal corrosion protection. The compound borate is used as an environment-friendly microbial corrosion inhibitor and is used for relieving the problem of microbial corrosion in the service process of a metal material. The compound borate is added into an environment capable of causing microbial corrosion, and it is guaranteed that the total mass concentration range of the borate in the environment is larger than or equal to 80 mg / L and smaller than or equal to 140 mg / L. On the premise that the total mass concentration of borate is kept unchanged, compared with other compound types, sodium octaborate (Na2B8O13. 4H2O) and potassium pentaborate (K2B10O16. 8H2O) are compounded according to the ratio of 1: 1-3: 1, growth of an electroactive microorganism Shewanella oneidensis MR-1 can be synchronously and efficiently inhibited, metal corrosion is slowed down, the synergistic effect is highlighted, and the risk of eutrophication is avoided.

The invention discloses an in-situ electrochemical and corrosion monitoring device and an in-situ electrochemical and corrosion monitoring method for researching marine microorganism adhesion and metal corrosion behaviors under high-flux simulated seawater flowing conditions. The device comprises a flow cell, an industrial camera and a data analysis system, flowing seawater and a three-electrode system externally connected with an electrochemical workstation are arranged in the flowing pool, and a working electrode in the three-electrode system is metal attached with marine microorganisms and used for researching corrosion behaviors; the industrial camera is used for shooting to obtain the working electrode corrosion condition; the data analysis system is used for acquiring data of the electrochemical workstation, processing the data by using a distribution relaxation time dissociation algorithm, acquiring high-throughput microbial corrosion electrochemical data of the electrochemical workstation, taking a time sequence as a variable, acquiring an image shot by the industrial camera, and performing image processing and feature extraction; and establishing an electrochemical-image cross validation mechanism, and generating a comprehensive analysis report containing a distribution relaxation time dissociation result, corrosion morphology statistics and a time evolution trend.

The invention belongs to the technical field of metal corrosion protection, and discloses a hydrogen-microorganism synergistic corrosion protection coating as well as a preparation method and application thereof. The coating comprises the following components in parts by weight: 100 parts of epoxy resin, 18-22 parts of liquid polysulfide rubber, 5-7 parts of palladium modified hexagonal boron nitride nanosheets, 6-10 parts of [P4444] [Gly] coated SiO2 microcapsules, 2-4 parts of a silane coupling agent and 35-45 parts of an amine curing agent. The coating can efficiently block hydrogen permeation and inhibit microbial corrosion for a long time at the same time.

The invention belongs to the technical field of deep sea corrosion experimental equipment, and particularly relates to an integrated deep sea high-pressure microbial corrosion simulation system and a use method thereof. The system comprises a control system, an electrochemical workstation, a high-pressure corrosion simulation device, a microbial culture device, a temperature control assembly and a real-time monitoring assembly, and data collection and control are performed through the control system; the high-pressure corrosion simulation device comprises a high-pressure kettle, the high-pressure corrosion simulation device is connected with the microorganism culture device, and the microorganism culture device comprises a reaction kettle. According to the invention, pressure and microbial corrosion in the deep sea environment can be simulated, and the corrosion behavior of the metal material in the deep sea environment can be comprehensively and accurately monitored in cooperation with a tensile test and electrochemical corrosion monitoring. Through cooperative work of the autoclave and the reaction kettle, it is guaranteed that the pressure in the autoclave meets the deep sea pressure requirement, it is guaranteed that a culture medium input into the autoclave is sterile from the source, the purity of an experiment and the accuracy of data are guaranteed, and the real environment can be better simulated.

The invention discloses a microbial corrosion control method based on biological membrane attachment area regulation, which comprises the following steps: under the condition of keeping the volume of a liquid culture medium and a bacterial strain unchanged, introducing solid fillers which account for a fixed total volume but have different specific surface areas into a closed anaerobic reactor so as to form a multi-stage attachable area; a pretreated metal sample is placed in the closed anaerobic reactor, and the surface of the sample is only in contact with the culture medium and the biological membrane distribution area determined by the filler; and culturing at the same temperature and time, and synchronously monitoring the growth, corrosion rate and gas production rate of the biological membrane, so as to establish a quantitative relationship among biological membrane distribution area-corrosion behavior-mechanical property, and realize directional control of the microbial corrosion process by regulating and controlling area parameters.

The invention discloses a method for evaluating the corrosion state of microorganisms in real time, high-strength steel and a preparation method. The method for evaluating the corrosion state of the microorganisms in real time comprises the following steps that a microalloyed steel test piece for monitoring is prepared; establishing a microbial corrosion environment: placing the test piece in a culture medium containing microbial flora to form an anaerobic corrosion environment; monitoring a resistance signal in real time: in the corrosion process, continuously measuring resistance values at the two ends of the test piece, and obtaining a resistance-time change curve; and analyzing the corrosion state: evaluating the corrosion stage and uniformity of the material according to the characteristics of the resistance-time change curve.

The invention belongs to the field of anti-corrosion and anti-fouling new materials for engineering facilities and equipment in a harsh marine environment, and particularly relates to a cerium-nitrogen synergistic microalloyed marine anti-microbial corrosion super austenitic stainless steel and a preparation method of the cerium-nitrogen synergistic microalloyed marine anti-microbial corrosion super austenitic stainless steel. The steel comprises the following chemical components in percentage by mass: 22.8-23.2% of Cr, 24.8-25.2% of Ni, 5.4-5.6% of Mo, 0.18-0.22% of N, 0.4-2.0% of Ce, less than or equal to 0.025% of C, less than or equal to 0.4% of S i, less than or equal to 0.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S and the balance of Fe and inevitable trace impurities, and the steel meets the condition that PREN =% Cr + 3.3 *% Mo + 16 *% N > = 45.

This invention relates to the field of anti-corrosion reagent technology, specifically disclosing a method for manufacturing a solid oxygen-removing, bactericidal, corrosion-inhibiting, and scale-inhibiting agent for seawater oil well pipelines. The agent comprises a three-layer core-shell structure: the core layer is composed of a copolymer hydrogel of 2-acrylamido-2-methylpropanesulfonic acid and N-vinylcaprolactam, loaded with sodium isoascorbate and a copper-L-histidine complex; the middle layer is composed of 3-aminophenylboronic acid-functionalized silica nanoparticles and catechol linked by dynamic borate ester bonds; and the shell layer is composed of a copolymer of 3,4-dihydroxyphenylalanine and 1H,1H,2H,2H-perfluorodecyl acrylate coating a corrosion-inhibiting and bactericidal complex. This invention overcomes the pH conflict between oxygen removers and corrosion inhibitors in traditional reagents through the synergistic effect of the core-shell structure and dynamic bonds, achieving integrated functions of oxygen removal, bactericidal action, corrosion inhibition, and scale inhibition. It effectively inhibits microbial corrosion, reduces the risk of scaling, extends the lifespan of seawater pipelines, and is suitable for complex marine conditions.

To provide an inexpensive, microbially corrosion-resistant steel sheet that has long-term resistance to microbial corrosion against Shewanella chilikensis and is suitable for use in transport pipelines. [Solution] The composition of the steel sheet is such that, in mass%, it contains C: 0.01% to 0.30%, Si: 0.01% to 1.00%, Mn: 0.10% to 2.50%, P: 0.030% or less, S: 0.0100% or less, N: 0.0100% or less, Al: 0.010% to 0.300%, Cu: 0.01% to 0.15%, and Cr: 0.05% to 1.50%, with the remainder being Fe and unavoidable impurities, the content of solid-solution Cr is 0.03% or more in mass%, and the mass ratio of the content of solid-solution Cr to the content of Cr in the composition is 0.30 or more.

This invention belongs to the field of concrete technology, specifically disclosing an anti-corrosion coating material for concrete pipelines. It is made from the following raw materials in weight percentages: water 22.5%~23.0%, calcium nitrite 0.5%~1.5%, and silicate cement 75.0%~77.5%. This invention also discloses a method for preparing the anti-corrosion coating material for concrete pipelines, including the following steps: (1) weighing each raw material according to the weight ratio; (2) mixing the dry calcium nitrite and silicate cement evenly; (3) slowly pouring in the aqueous solution and stirring slowly, then stirring rapidly for 1 minute after even mixing to obtain the pipeline anti-corrosion coating material. This invention has economic and environmental advantages, and the coating also possesses outstanding anti-corrosion performance, solving the problem of concrete durability degradation caused by internal chemical corrosion and microbial corrosion in municipal sewage pipelines, and effectively extending the service life of pipelines.

The invention discloses a concrete microbial corrosion simulation device and a microbial corrosion simulation method in a marine environment, and relates to a concrete microbial corrosion simulation device and a simulation method. The problems that existing concrete microbial corrosion can only simulate a single corrosion zone and only a single acid-producing microorganism is selected for simulation, so that the simulation result is inaccurate are solved. The device disclosed by the invention realizes laboratory in-situ simulation of three typical microbial corrosion areas, namely an atmospheric area, a tidal range area and a total immersion area of a marine environment, and has the advantages of good simulation effect and high automation degree. According to the experimental method for corroding the concrete through the synergistic corrosion microorganisms, a solution is provided for the experimental method for subsequently exploring the effect and mechanism of corroding the concrete through the synergistic acid-producing microorganisms in different corrosion zones in the marine environment, the actual situation is better met, and subsequent research on the mechanism of corroding the concrete through the microorganisms is facilitated.

The invention discloses a multi-dimensional quantitative detection method for microbial corrosion resistance of Cr-containing steel. The method comprises the following steps: a microbial challenge test: inoculating sulfate reducing bacteria into a culture medium, and exposing a sample in a microbial environment; performing quantitative analysis on corrosion products: performing ultrasonic rust removal on the sample by using an acid pickling solution, then calculating a weightlessness corrosion rate, and quantifying the adhesion amount of microorganisms on the surface of the sample; multi-mode electrochemical testing: monitoring the open-circuit potential and linear polarization resistance of the sample, and performing electrochemical impedance spectroscopy and potentiodynamic polarization curve testing to obtain corrosion current density and polarization resistance; surface analysis: analyzing the corrosion morphology and element distribution of the sample through a scanning electron microscope and an energy disperse spectroscopy, and determining the chemical state of the chromium element by adopting X-ray photoelectron spectroscopy to obtain the stability and the sulfur content of a passive film; and evaluating the corrosion degree: establishing a coupling model of the corrosion current density, the polarization resistance, the passivation film stability, the microorganism adhesion amount and the sulfur content, and calculating the corrosion degree.

This invention discloses a microbial corrosion method for preparing Al for hydrogen production by water electrolysis. 0.6 The method for developing a CrFe2Ni2 high-entropy alloy catalyst belongs to the field of electrochemical catalysis technology. This invention uses sulfate-reducing bacteria (SRB) as the experimental strain and bulk Al as the catalyst. 0.6 A CrFe2Ni2 high-entropy alloy was used as the matrix material. After SRB corrosion, the FeS corrosion product generated on the alloy surface promoted the catalytic activity of the material. The resulting catalyst was used as the working electrode for water electrolysis to produce hydrogen, exhibiting excellent OER activity and durability in alkaline solutions. Compared with existing technologies, this invention is the first to combine microbial corrosion with bulk alloys for industrial hydrogen production via water electrolysis. The preparation method is simple and mild, with potential application prospects, and provides theoretical guidance and technical support for the design and synthesis of other non-precious metal water electrolysis catalysts.

The invention discloses a water flow-chilling-sediment-microorganism coupling extreme working condition laser in-situ remediation real-time regulation and control test device and a remediation method, and aims to solve the technical problem that an existing environment simulation device is difficult to simulate complex working conditions. An integrated reaction cavity in the laser in-situ repair real-time regulation and control test device is installed in a pressure-resistant sealed cabin, and a multi-dimensional turbulator and a circulating propeller are arranged in the multi-dimensional extreme environment integrated reaction cavity. The microorganism in-situ planting cabin, the chilling medium storage and supply cabin and the abrasion particle quantitative cabin are respectively communicated with the multi-dimensional extreme environment integrated reaction cavity through connecting pipes; and a laser repairing and monitoring system is arranged at the top of the sealed cabin. The real-time regulation and control test device disclosed by the invention has high environmental simulation and real-time regulation and control capabilities, can independently monitor the repair process under a single working condition of chilling and shock solidification, high-speed turbulence, sediment scouring or microbial corrosion, and can also analyze the defect formation mechanism of the laser cladding layer under the coupling action of four-dimensional extreme working conditions in real time.