5095 results about "Corrosive substance" patented technology

The invention discloses a steel wire rod for a 2400-2460 MPa grade stress corrosion resistant prestressed steel strand, the steel strand and a production method. The steel wire rod comprises the following chemical components in percentage by weight: 0.90-0.97% of C, 0.6-1.2% of Si, 0.2-0.8% of Mn, 0.15-0.45% of Cr, 0.02-0.05% of V, 0.01-0.05% of Nb, less than 0.30% of Ni, less than 0.30% of Cu, less than 0.30% of Mo, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical components and the production process of the wire rod, the strength of the prepared steel strand meets 2400-2460 MPa, the minimum stress corrosion value is 2.5 hours, the median value is 5 hours, and the stress corrosion resistance is obviously superior to that of an existing steel strand.

The invention relates to the technical field of aluminum alloy, in particular to a high-strength corrosion-resistant aluminum alloy material and a preparation method and application thereof.The high-strength corrosion-resistant aluminum alloy material comprises, by weight, 4.5%-8.5% of Mg, 3.5%-5.5% of Zn, 0.8%-1.6% of Cu, at least two of the following elements with the total content not larger than 0.5%: 0.05%-0.15% of Mn, 0.05%-0.15% of Cr, 0.05%-0.12% of Ti, 0.06%-0.16% of Sc, 0.08%-0.14% of Er, 0.06%-0.12% of Zr and the balance Al and inevitable impurities. The total content of the impurities does not exceed 0.4%, and the balance is Al. Wherein the mass ratio of Mg to Zn is 1.1-2.0, when Sc and Zr exist at the same time, (Sc + Zr) is larger than or equal to 0.15% and smaller than or equal to 0.2%, when Er and Zr exist at the same time, (Er + Zr) is larger than or equal to 0.16% and smaller than or equal to 0.24%, and each impurity element is smaller than or equal to 0.15%. The exfoliation corrosion, stress corrosion and salt spray corrosion performance of the alloy is greatly improved by controlling the content and mass ratio of all the elements, and the exfoliation corrosion performance of the alloy is not lower than the P level; in a slow strain rate tensile test in saline water, the attenuation proportion of the elongation is not greater than 9% compared with that of an inert medium, and good stress corrosion cracking resistance is shown; in a 960h neutral salt spray corrosion test, the average corrosion rate is not greater than 0.1 g / (m < 2 >. H).

The invention belongs to the technical field of ceramic glaze, and particularly discloses antibacterial ceramic glaze and a preparation method thereof.The ceramic glaze is prepared from, by mass, 60-75 parts of basic glaze, 1-3 parts of nanometer titania, 2-6 parts of cosolvent, 0.5-3 parts of ochre, 5-10 parts of curcumin, 1-3 parts of stabilizer, 1-5 parts of rare earth antibacterial agent and 1-3 parts of sodium polyacrylate, and 1-6 parts of a composite additive. According to the antibacterial ceramic glaze and the preparation method thereof, the antibacterial performance, glossiness and smoothness of a glaze surface are improved, the crystal structure of the glaze can be refined through introduction of rare earth ions, the hardness of the glaze surface is enhanced, the wear resistance of a ceramic product is effectively improved, and the service life of the ceramic product is prolonged. Stable chemical bonds are formed in the glaze due to the special chemical properties of the rare earth elements, the resistance of the glaze to chemical substances such as acid and alkali is enhanced, and the chemical corrosion resistance of the ceramic glaze is improved.

The invention discloses a 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate and a manufacturing method thereof, and the 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate comprises the following chemical components: 0.05 to 0.10 percent of C, 0.6 to 0.9 percent of Si, 1.50 to 1.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.10 to 0.30 percent of Cr, 0.35 to 0.45 percent of Mo, 0.03 to 0.05 percent of Nb, 0.01 to 0.03 percent of Ti, 0.02 to 0.05 percent of Al, 0.20 to 0.30 percent of Co, less than or equal to 0.008 percent of N, 1.2 to 4.3 percent of Mo / Cr, 0.75 to 0.92 percent of Mo + Cr + Co, 2.8 to 3.9 percent of Si / Co and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, continuous casting slab heating, rolling, cooling and coiling. In the transverse direction of the rolled plate, Rt0.5 is larger than or equal to 540 MPa, Rm is larger than or equal to 640 MPa, Rt0.5 / Rm is smaller than or equal to 0.87, A50 mm is larger than or equal to 36%,-40 DEG C impact energy KV8 is larger than or equal to 220 J, and-20 DEG C drop weight DWTT is larger than or equal to 95%; in the longitudinal direction, Rt0.5 is larger than or equal to 520 MPa, Rm is larger than or equal to 630 MPa, Rt0.5 / Rm is smaller than or equal to 0.86, and A50mm is larger than or equal to 38%; the average corrosion rate in a 14.5 MPa supercritical CO2 environment is 1t; and 0.05 mm / a. The low-carbon medium-manganese molybdenum-chromium-cobalt-containing alloy design is adopted, the low-temperature toughness of a weld joint is guaranteed, the CO2 corrosion resistance and the oxidation resistance are improved, and higher safety is achieved in pipeline engineering.

The invention discloses a wide and thick steel plate for a 700MPa-grade corrosion-resistant anti-fatigue marine tendon pipe and a production method of the wide and thick steel plate. According to the component design of the wide and thick steel plate, CEIIW is controlled to be 0.41-0.47%, CEPcm is controlled to be 0.16-0.20%, low-Nb and low-Mo design is adopted, the phase change temperature is increased, and phase change of polygonal ferrite is promoted; rE solid solution, interface segregation and other effects are fully utilized to improve the strength and corrosion resistance, and the RE and Ca act together to purify molten steel and modify and disperse inclusions. On the basis of component design, low-temperature heating, rough rolling multi-stage thickness section high-temperature gradient deformation and low-temperature rolling, intermediate temperature-waiting blank rapid cooling after rough rolling is finished, finish rolling low-temperature deformation, multi-stage water cooling and other methods are adopted to obtain a microstructure of lath bainite, granular bainite and polygonal ferrite, and the proportion, size and distribution control of all phases is ideal; the method plays an important role in obtaining good comprehensive performance of the steel plate.

The invention discloses a steel wire rod for a 2500-2560 MPa grade stress corrosion resistant prestressed steel strand, the steel strand and a production method. The steel wire rod comprises the following chemical components in percentage by mass: 0.95-1.02% of C, 0.8-1.5% of Si, 0.5-1.0% of Mn, 0.25-0.45% of Cr, 0.02-0.08% of V, 0.01-0.05% of Nb, less than 0.30% of Ni, less than 0.30% of Cu, less than 0.30% of Mo, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical components and the production process and refining the microscopic structure, the steel strand prepared from the steel wire rod has high tensile strength, the minimum stress corrosion value is 2.5 hours, the median value is more than 5 hours, and the steel strand shows excellent stress corrosion resistance.

The invention relates to the technical field of adsorbents, and particularly discloses an aluminum oxide type adsorbent and a preparation method thereof.The preparation method comprises the following steps that lanthanum salt, cerium salt and a polyethylene glycol aqueous solution are mixed to be uniform, then the mixture is mixed with gamma-Al2O3 to be uniform, pH is adjusted, standing is conducted, solid-liquid separation is conducted, drying and roasting are conducted, and a double-doped carrier is obtained; dispersing the double-doped carrier in a mixed solution containing 2-methylimidazole, ferric salt and zinc salt, adjusting the pH value, carrying out heating reaction, solid-liquid separation and drying in an inert atmosphere, grinding to obtain powder, and carrying out molding treatment on the powder to obtain a composite carrier; uniformly mixing the Ag modified molecular sieve with silica sol, coating the surface of the composite carrier with the mixture, and drying to obtain an adsorbent precursor; dipping an adsorbent precursor in the dispersion liquid, and after dipping, solid-liquid separation and drying, reactivating to obtain the aluminum oxide type adsorbent; the prepared adsorbent can synergistically and efficiently remove multiple impurities and is excellent in corrosion resistance.

The invention belongs to the field of metal materials, and particularly relates to a high-strength hot-rolled pickled steel plate for an automobile chassis and a production method thereof. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, V, Ni, Cu, Cr, Pt and Y, P is limited to be less than or equal to 0.015%, S is limited to be less than or equal to 0.005%, N is limited to be less than or equal to 0.006%, and the balance is Fe and inevitable impurities. The yield strength of the steel plate ranges from 498 MPa to 552 MPa, the tensile strength ranges from 608 MPa to 643 MPa, the transverse elongation A ranges from 33% to 38%, the steel plate is qualified after transverse cold bending by 180 degrees D = a, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra ranges from 1.10 micrometers to 1.35 micrometers, and the steel plate has excellent corrosion resistance.

The invention relates to the technical field of wood corrosion prevention and corrosion resistance treatment, in particular to a preparation process of a coating for improving the antibacterial and corrosion-resistant performance of wood. In order to improve the antibacterial and corrosion-resistant capabilities of the prepared coating, a corrosion-resistant antibacterial agent is prepared and added into the raw materials of the coating, and quaternary ammonium salt, guanidyl and other group structures are introduced into the corrosion-resistant antibacterial agent, so that the antibacterial performance on microorganisms such as fungi is realized; the introduction of fluorine can effectively improve the hydrophobicity of a coating of the paint and reduce the influence of water vapor on antibacterial components in the coating, and the introduction of allyl can enable the corrosion-resistant antibacterial agent to react with butyl acrylate and other raw materials under the action of an initiator to achieve the cross-linking ability, so that the loss of the corrosion-resistant antibacterial agent is effectively avoided, and the service life of the coating is prolonged. The antibacterial activity is kept for a long time.

The invention discloses a hot-rolled high-weather-resistance steel plate with extremely low yield ratio and 850 MPa-grade tensile strength as well as a manufacturing method and application of the hot-rolled high-weather-resistance steel plate. The steel plate comprises chemical components in percentage by weight as follows: 0.06%-0.08% of C, 0.40%-0.60% of Si, 0.40%-0.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 2.50%-3.00% of Cr, 0.25%-0.30% of Cu, 0.13%-0.15% of Ti, 0.020%-0.040% of Alt, smaller than or equal to 0.0040% of N, smaller than or equal to 0.0030% of O and the balance of Fe and inevitable impurities. The high Cr + high Ti design is adopted, the tensile strength reaches 850 MPa, the weather resistance index I value is larger than or equal to 8.0, addition of precious metal Ni is omitted, the addition amount of the strong hardenability element Cr in the steel exceeds 2.50%, a fine grain ferrite and bainite double-phase structure is obtained in combination with the controlled rolling and controlled cooling process, meanwhile, the precipitation strengthening and fine grain strengthening effects of Ti are fully exerted, control over high strength and the extremely-low yield ratio smaller than 0.65 is achieved, and the high-strength and low-yield-ratio steel is obtained. The forming performance is excellent, the corrosion rate is smaller than 40% relative to Q345B, and good atmospheric corrosion resistance is achieved.

The invention provides a power transmission and transformation project reinforced concrete corrosivity evaluation method and system, and relates to the technical field of civil engineering durability evaluation.The method comprises the steps that temperature data of a project location and the total volume, the water content and the pore volume of reinforced concrete are collected, and a freeze-thaw failure index formula is constructed; the product type is judged according to the measured sulfate concentration, different sulfate erosion index formulas are constructed in combination with related data, and the magnesium ion concentration is independently considered in the marine environment; constructing a chlorine salt erosion index formula according to the chloride ion concentration; extracting data from the research report to construct a carbonization erosion index formula; and giving a weight to each erosion type to establish a comprehensive corrosivity evaluation index formula, and judging the erosion degree according to a result. By means of the method, various erosion factors can be comprehensively considered, the erosion degree can be effectively judged according to the evaluation result, and a key basis and scientific guidance are provided for durability guarantee, protective measure making and maintenance decision making of the reinforced concrete structure of the power transmission and transformation project.

The invention discloses a thermal / environmental barrier coating with high thermal insulation, thermal shock resistance and CMAS corrosion resistance as well as a preparation method and application of the thermal / environmental barrier coating. The SiCf / SiC composite material is prepared on the surface of a SiCf / SiC substrate by adopting a plasma spraying-physical vapor deposition technology, and comprises a Si-HfO2 bonding layer, a double-middle layer of Yb2Si2O7 and Yb2SiO5 and a (Dy0.2 Ho0.2 Er0.2 Tm0.2 Lu0.2) 2Hf2O7 top layer from bottom to top, the molar ratio of Si to HfO2 is 15: 85, and the double-middle layer is composed of Yb2Si2O7 and Yb2SiO5. The Si-HfO2 bonding layer provided by the invention has excellent high-temperature performance while providing good bonding force; the Yb2Si2O7 intermediate layer relieves the problem of thermal expansion mismatch between the upper coating and the lower substrate, and further expansion of cracks is hindered through plastic deformation; the Yb2SiO5 middle layer is excellent in water and oxygen corrosion resistance; the (Dy0. 2Ho0. 2Er0. 2Tm0. 2Lu0. 2) 2Hf2O7 top layer provides excellent CMAS corrosion resistance and is excellent in heat insulation performance, and the service temperature can be further increased. The coating has relatively high density and uniformity, presents good mechanical combination with a matrix, can bear thermal shock performance at 1500 DEG C and resist CMAS corrosion, and can be used as a protective coating of a hot end part of an aero-engine.

The invention relates to the technical field of coatings, and discloses a product wear-resistant and corrosion-resistant remanufacturing process method based on laser deposition, which comprises the following steps: surface pretreatment: pretreating the substrate surface of a product to remove a surface oxide layer, oil stains and other impurities so as to improve the adhesive force of the coating; laser cladding coating preparation: a first wear-resistant coating is deposited on the surface of the pretreated matrix through a laser cladding process, and the wear-resistant coating is Fe-based or Co-based multi-component alloy powder; an ion deposition coating is prepared, specifically, a second corrosion-resistant coating is formed on the first coating through the ion deposition technology, and the corrosion-resistant coating is made of a ceramic material. Through the design of the functional gradient coating, the combination of the toughness of the inner layer and the hardness of the outer layer is realized, the wear resistance and the corrosion resistance are improved, the adhesive force is enhanced through metallurgical bonding, cracking and peeling are avoided, the residual stress is eliminated through low-temperature annealing and polishing, and the stability and the service life of the coating in a high-wear and high-corrosion environment are ensured.

The invention relates to the technical field of photovoltaic module packaging, in particular to a corrosion-resistant EVA (Ethylene Vinyl Acetate) packaging adhesive film which is prepared by the following method: uniformly mixing 100 parts by weight of ethylene-vinyl acetate copolymer, 0.8-2 parts by weight of cross-linking agent, 0.1-0.3 part by weight of antioxidant, 0.1-0.3 part by weight of light stabilizer, 0.3-3 parts by weight of silane coupling agent and 0.4-1 part by weight of acid remover; and extruding in a single-screw extruder at the temperature of 95 DEG C to prepare the EVA packaging adhesive film with the thickness of about 0.5-0.7 mm. According to the invention, the deacidification agent is added, and the deacidification agent comprises magnesium hydroxide master batch and polycarbodiimide master batch; after the acid remover is used, the content of acetic acid after the adhesive film is aged is reduced, and the corrosion resistance of the adhesive film is improved.

The present application relates to a construction method for a corrosion-resistance degree-mechanical property analysis model of a metal material, and the use thereof. The construction method for the analysis model comprises the following steps: using a metal material as a test object, and acquiring corrosion test experimental data sets at different equivalent corrosion time points under corrosion test conditions and mechanical property test experimental data sets at different corrosion degrees corresponding to the different equivalent corrosion time points; and respectively establishing an empirical relational expression of corrosion parameters changing with an equivalent corrosion time and an empirical relational expression of mechanical parameters changing with the equivalent corrosion time.

The invention belongs to the technical field of corrosivity detection, and particularly relates to a heat supply pipeline corrosivity detection device and method.The heat supply pipeline corrosivity detection device comprises a machine tool, a detection ring, a gas storage tank and a console; sealing assemblies are arranged on two end surfaces of the detection ring; the surface of the detection ring is fixedly connected with a pressure sensor and a concentration sensor; a conveying pump is arranged on the surface of the gas storage tank; a conveying pipe is communicated between the conveying pump and the detection ring; a control panel is arranged on the surface of the console; an analysis module is arranged in the console; the whole pipeline does not need to be put into detection equipment during corrosion detection, the device is more suitable for heat supply pipelines with larger sizes, the pipeline installation is more convenient, different positions of the pipeline can be tested section by section, the corrosion condition of the whole pipeline can be judged, the specific corrosion position of the pipeline can be known, and the detection efficiency is improved. And the detection result is finer, so that a worker can adaptively adjust the production process according to the specific corrosion position.

The invention relates to a special cable sheath material for trucks and a preparation method thereof, and belongs to the technical field of cable sheath materials, the special cable sheath material comprises the following raw materials: 40-55 parts of polyvinyl chloride, 15-20 parts of high vinyl polybutadiene rubber, 12-16 parts of a modified reinforcing material, 0.5-1.5 parts of a stabilizer, 1-3 parts of an anti-aging agent, 2-4 parts of a compatilizer and 4-8 parts of a filler; according to the technical scheme, the plant-based compound is combined with caffeic acid, epoxidation is performed, and the composite plasticizer is obtained; the composite plasticizer is combined with the silanized graphene oxide to obtain a reinforcing material; combining the reinforcing material with an amino compound to obtain a modified reinforcing material; mixing polyvinyl chloride, high vinyl polybutadiene rubber, the modified reinforcing material, a stabilizer, an anti-aging agent, a compatilizer and a filler, and performing extrusion granulation to obtain the special cable protective sleeve material for the truck. The mechanical property, the corrosion resistance and the aging resistance of the protective sleeve are integrally improved, and the environmental protection property is good.

The invention relates to the technical field of composite pipes, and discloses a wear-resistant acid-corrosion-resistant environment-friendly anti-explosion PE pipe. The pipe adopts a multi-layer co-extrusion structural design, and comprises a wear-resistant inner layer, a reinforced middle layer and a protective outer layer. High-density polyethylene is used as a base material, silicon carbide particles and aluminum oxide particles with the surfaces subjected to multifunctional modification are combined to serve as reinforcing filler, and functional polyethylene is used as a base interface modification material, so that the problems that in a traditional pipe, particles and a base interface are low in bonding force, uneven in dispersion, prone to falling off and the like are solved. Carboxyl and unsaturated double bonds are introduced into the functionalized polyethylene through a maleic anhydride grafting technology, so that efficient chemical combination of particles and a matrix is realized, and the mechanical property and the chemical stability of the composite material are improved. The inner layer enhances wear resistance through high particle content, the middle layer provides support and corrosion resistance, and the outer layer improves weather resistance and protection performance of the pipe.

The invention relates to the technical field of chlorinated polyvinyl chloride plastics, in particular to a PVC corrosion-resistant cable protection pipe and a preparation process thereof. The invention aims to solve the problem that the mechanical property and the corrosion resistance of the existing PVC cable protection pipe cannot be considered at the same time. Chlorinated polyvinyl chloride and polyvinyl chloride are subjected to hot mixing to obtain matrix resin, and the corrosion-resistant additive, the composite flame retardant, the flexibilizer and other additives are added to obtain the cable protection tube. The corrosion-resistant additive is obtained by grafting and modifying nano silicon dioxide with epoxy resin and premixing with an ethylene-vinyl alcohol copolymer; the composite flame retardant comprises core layers of nitrogen series, phosphorus series and inorganic hydroxides and a shell layer of an acrylate polymer, and is obtained through a core-shell reaction; the cable protection pipe is prepared through a multi-step mixing process; by introducing the core-shell structure and the corrosion-resistant auxiliary agent, efficient flame retardance and corrosion resistance are achieved, stress is buffered through the flexible shell layer, and the mechanical property of the material is maintained.

The invention discloses an anti-aging water-stop belt and a preparation method and application thereof, and relates to the technical field of water-stop belts. The invention relates to an anti-aging water-stop belt which is prepared from the following raw materials in parts by mass: 40-60 parts of chloroprene rubber, 10-20 parts of natural rubber, 10-20 parts of ethylene propylene diene monomer, 15-30 parts of carbon black, 5-15 parts of white carbon black, 5-15 parts of a plasticizer, 0.5-2 parts of sulfur, 0.5-1.5 parts of an accelerant, 1-2 parts of an anti-aging ultraviolet light absorber, 5-15 parts of aluminum hydroxide, 1-3 parts of stearic acid and 3-8 parts of zinc oxide. The obtained water-stop belt has excellent ultraviolet aging resistance, ozone resistance and chemical corrosion resistance while keeping high elasticity, the mechanical stability of the water-stop belt is remarkably improved compared with that of a traditional product, the water-stop belt is suitable for joint sealing in harsh environments such as bridges, tunnels and water conservancy projects, and the waterproof service life of engineering structures can be effectively prolonged.

The invention discloses a high-flux testing device for accurately testing the dynamic erosion corrosion performance of a material, which comprises a testing kettle, a rotating system, a liquid circulating system and a liquid collecting tank, the rotating system comprises a motor and a rotating blade, and the rotating blade is provided with a sample; the invention further discloses a testing method for high-flux accurate testing of the dynamic erosion corrosion performance of the material. The method comprises the step of injecting the corrosion solution to scour a sample. The rotation system is arranged to realize rotation of the sample, the test kettle and the liquid circulation system matched with the test kettle are arranged to realize erosion of the corrosion solution to the sample, the flow rate is controllable, the corrosion solution can be reused, and a plurality of samples can be subjected to long-time erosion corrosion test in the same environment and under different test conditions. The corrosion performance of the material under the same corrosion environment, different operation states and different temperatures is accurately obtained, so that the function of accurately testing the dynamic erosion corrosion performance at high flux is realized, and the testing device has the characteristics of high safety coefficient, convenience in operation and the like.

The invention belongs to the field of metal materials, and particularly relates to a high-elongation 288MPa-grade hot-rolled pickled steel plate for an automobile and a production method thereof. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the chemical components of C, Si, Mn, Al, Ti, Zr, Ni, Pt and Y, P is limited to be smaller than or equal to 0.015%, S is limited to be smaller than or equal to 0.005%, N is limited to be smaller than or equal to 0.003%, and the balance is Fe and inevitable impurities. The steel plate has excellent mechanical properties, the yield strength of the steel plate is larger than or equal to 238 MPa, the tensile strength is larger than or equal to 288 MPa, the transverse elongation A is larger than or equal to 48%, the hole expansion rate is larger than or equal to 132%, transverse cold bending is conducted by 180 degrees, D = a, the steel plate is qualified, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra is 1.08-1.48 micrometers, and the steel plate has good corrosion resistance.

The invention discloses a corrosion resistance detection device for PFA film production, and relates to the technical field of film corrosion detection. Comprising a box body, a mounting plate is fixedly connected to the interior of the box body, a mounting frame is fixedly connected to the upper end of the mounting plate, a rotating column is arranged on the inner top wall of the mounting frame in a penetrating mode, the rotating column is rotationally connected with the mounting frame, a rotating plate is fixedly connected to the lower end of the rotating column, and a plurality of corrosive liquid dropwise adding mechanisms are arranged on the rotating plate; the multiple corrosive liquid dropwise adding mechanisms are arranged in the circumferential direction of the rotating plate at equal intervals, a rotating mechanism connected with the rotating column is arranged on the mounting frame, a mounting groove is formed in the upper end of the mounting frame, a limiting mechanism is arranged in the mounting groove, and a partition plate located below the mounting plate is fixed in the box body. According to the invention, through movement of the PFA film, different corrosive liquids can carry out corrosion resistance detection on different positions of the PFA film in sequence, so that the corrosion resistance detection process is more efficient.

The invention relates to the technical field of insulating materials, in particular to insulating powder and a preparation method thereof. The invention discloses a flame-retardant coating which comprises the following components in parts by weight: 15-25 parts of epoxy resin, 10-20 parts of aluminum hydroxide, 5-12 parts of nano boron nitride, 1-3 parts of a silane coupling agent KH-560, 3-8 parts of polytetrafluoroethylene micro powder, 2-6 parts of fluorine-modified montmorillonite, 4-9 parts of melamine cyanurate, 2-5 parts of nano titanium dioxide, 1-4 parts of a fluorine-modified graphene oxide-polyaniline composite material and 0.5-2 parts of pentaerythritol stearate. The anti-corrosion coating is prepared from the following components in parts by weight: 1 to 3 parts of nano zinc oxide, 5 to 10 parts of glass fiber, 2 to 5 parts of polyhedral oligomeric silsesquioxane-polyimide copolymer, 1 to 4 parts of ferrocenyl epoxy resin and 0.5 to 2 parts of perfluorooctyltriethoxysilane. The insulation powder is high in corrosion resistance, excellent in insulation, heat dissipation and mechanical performance, environmentally friendly in processing, good in adaptability, capable of prolonging the service life of equipment and reducing the cost, suitable for special environments and wide in popularization prospect.

The invention discloses a cold-rolled silicon steel thin strip and a processing method thereof, and relates to the technical field of silicon steel strips. According to the method, the silicon steel plate is cold-rolled into the ultrathin silicon steel strip, then the ultrathin silicon steel strip is subjected to activating treatment through the activating solution and then coated with the anti-corrosion coating, and the prepared ultrathin silicon steel strip has good corrosion resistance. According to the invention, phytic acid and modified polyaspartic acid are added into an activating solution. According to the iron-based organic framework material, polysuccinimide is used as a raw material, dopamine is added for grafting modification, a polymer which takes polyaspartic acid as a framework and is grafted with dopamine is obtained, the dopamine has a catechol group, and the chelating property of the polyaspartic acid to metal ions on the iron-based organic framework material is further enhanced. And meanwhile, phytic acid is added into the activating solution, the phytic acid and the modified polyaspartic acid can form a nano-porous structure, loading of subsequent modified silica sol is facilitated, and therefore the corrosion resistance of the ultra-thin silicon steel strip is further enhanced.

The invention discloses a production method of 6-8mm low-cost high-strength rare earth weathering resistant steel. The production method comprises the following steps: (1) smelting-continuous casting production; wherein the molten steel comprises the following chemical components in percentage by mass: 0.11 to 0.13 percent of C, 0.25 to 0.35 percent of S , 0.5 to 0.6 percent of Mn, 0.06 to 0.08 percent of P, less than or equal to 0.008 percent of S, 0.20 to 0.25 percent of Cu, 2.1 to 2.3 percent of Cr, 0.12 to 0.14 percent of T , 20 to 80 ppm of La / Ce and 0.020 to 0.050 percent of Alt; and (2) a hot rolling production process flow: casting blanks, an induction heating furnace, a laboratory rolling mill, laminar cooling and simulated coiling. A conventional C, S, i and Mn component system design is adopted, and the corrosion resistance of the steel strip is improved by adding corrosion-resistant elements Cu, Cr, P and Ti and a small amount of rare earth La / Ce mixed rare earth.

The invention relates to the technical field of concrete, in particular to luminous pervious concrete and a preparation method thereof. The luminous permeable concrete is prepared from the following raw materials in parts by mass: 280-300 parts of cement, 870-900 parts of interval grading coarse aggregate, 70-80 parts of modified luminous powder, 30-40 parts of fly ash, 4-6 parts of a water reducing agent, 20-30 parts of a water repellent agent, 30-40 parts of epoxy resin, 3-5 parts of a silane coupling agent and 90-100 parts of water, and the interval grading coarse aggregate is prepared by mixing coarse aggregate with a small particle size of 4.95-9mm and coarse aggregate with a large particle size of 12.5-10mm according to a mass ratio of 1: 2; the surface of the modified luminescent powder is coated with silicon dioxide sol, and sodium borate is added for heat-resistant treatment. The light-emitting water-permeable concrete has compressive strength and water permeability, the light-emitting property is stable, and the hydrophobic and oleophobic corrosion resistance in the concrete is good.

The invention belongs to the technical field of preparation of hydrogen sulfide stress corrosion resistant oil well pipes, and relates to a 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material suitable for a normal temperature environment containing 1MPa H2S and a preparation method of the 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material. B, Ti, V and Nb elements are added, and the contents of Si, Mn and Ni elements, the Cr / Mo ratio and the sum of Nb, V and Ti in steel are controlled; the refined 100% sorbite structure, various compounds and microalloying are obtained through the processes of pure steel smelting, forging, controlled rolling and secondary heat treatment, so that high strength and high toughness in the 125 ksi range are obtained, and meanwhile the hydrogen sulfide corrosion resistance is high. The pipe product obtained by the process method disclosed by the invention has no corrosion cracking phenomenon after being subjected to a corrosion resistance test under the partial pressure of hydrogen sulfide of 1MPa.

The invention discloses a multi-dimensional rapid evaluation method for snow-melting agent corrosion resistance of stainless steel, and relates to the technical field of stainless steel performance evaluation.The multi-dimensional rapid evaluation method comprises the steps that sodium chloride, calcium chloride and magnesium chloride are weighed by mass and dissolved in deionized water, acetic acid and sodium hydrogen sulfite are added after dissolution, and the pH value is adjusted to 4-6; performing potentiodynamic polarization scanning and electrochemical impedance spectroscopy testing on the stainless steel sample to obtain pitting potential and impedance modulus; the method comprises the following steps: placing a stainless steel sample in a cyclic corrosion experiment box, carrying out a corrosion experiment under the conditions of controlling the cyclic temperature change of an environment temperature and periodically carrying out cyclic switching of a spraying mode, a humid mode and a drying mode, taking out the sample every set time, and measuring the corrosion rate and the maximum pitting depth; and according to the pitting potential, the impedance modulus, the corrosion rate and the maximum pitting depth, carrying out graded judgment on the corrosion resistance of the stainless steel. According to the method, the corrosion resistance of the stainless steel can be accurately evaluated in a short time.

The invention discloses a method for regulating the length-diameter ratio of calcium sulfate hemihydrate whiskers prepared from ardealite, and belongs to the field of ardealite resource utilization. According to the invention, carbohydrates, alcohols and other substances containing hydroxyl groups are used as the crystal modifier, and the calcium sulfate hemihydrate whisker is prepared by regulating and controlling phosphogypsum through a normal-pressure hydrothermal method, so that the length-diameter ratio of the whisker is regulated and controlled within a certain range. The method solves the problems that the length-diameter ratio of the whisker in the calcium sulfate hemihydrate whisker product prepared from ardealite is not uniform and cannot be regulated and controlled, the preparation process is tedious, the corrosivity is strong due to excessive salt solution in the reaction system, and the waste liquid has great harm to the environment, and has a good application prospect.