17 results about "Carbon corrosion" patented technology

The present application relates to the technical field of metallurgy, and particularly relates to a production method of a large-wall-thickness pipeline steel with improved carbon dioxide corrosion resistance and strength and toughness, and specific measures include: (1) controlling the bottom blowing mode and end point requirement in the converter process; (2) controlling the tapping time and replacing the tapping hole opportunity in the tapping process; (3) feeding the CAS aluminum wire and controlling the CAS argon blowing time; (4) controlling the top slag addition amount, heating time and outgoing mode in the LF refining process; (5) controlling the wire feeding parameters, soft blowing time and outgoing requirement of RH in the RH refining process; (6) controlling the precision requirement, casting speed fluctuation and crystallizer liquid level fluctuation of the continuous casting equipment in the continuous casting process to obtain the casting blank. Through controlling the parameters of each process in the smelting and rolling process, the present application realizes the whole-process steel cleanliness control and ladle grain refinement, and further improves the strength, low-temperature toughness, HIC resistance and carbon dioxide corrosion resistance of the large-wall-thickness pipeline steel.

The invention relates to the field of inorganic functional materials, and particularly discloses a corrosion-resistant layered Pt-C catalyst and a preparation method and application thereof. The nitrogen-doped carbon carrier, the spinel oxide and the Pt nanoparticles are arranged to form a novel corrosion-resistant catalyst, and through the synergistic effect of the spinel oxide AB2O4 and the nitrogen-doped carbon carrier N-Carbon, the electron cloud density on the surface of the carbon carrier is effectively reduced, the carbon corrosion problem of traditional Pt / C under high potential is inhibited, and the carrier stability is remarkably improved; spinel oxide is used as an anchoring point of platinum nanoparticles, the migration energy barrier of the platinum nanoparticles is improved, the platinum utilization rate is improved through an in-situ precipitation process, the comprehensive cost is reduced compared with commercial Pt / C, and due to the fact that the production process is simple and the production period is short, the production cost is reduced. The catalyst shows excellent oxygen reduction reaction catalytic activity and stability in zinc-air cells and fuel cells, the preparation method is simple, special equipment is not needed, and the catalyst has good industrial amplification potential.

The present invention provides a membrane electrode assembly for preventing reverse voltage of a fuel cell, comprising an electrolyte membrane between a positive electrode and a negative electrode, in which the positive electrode and the negative electrode each comprise a supported catalyst in which a metal catalyst is supported on a support, wherein the ratio MCL / R between the metal catalyst loading amount MCL in the negative electrode and the loaded metal catalyst ratio R is 0.125 to 0.3. This membrane electrode assembly can prevent an overflow phenomenon that may occur in cold start driving or fast acceleration driving by appropriately controlling physical property factors associated with a fuel cell negative electrode. Thus, this membrane electrode assembly can suppress carbon corrosion at the negative electrode and improve durability.

This invention discloses a Pt / O-NCP catalyst and its preparation method. It utilizes self-developed nanoporous carbon (NCP) as a support, which is modified to change the internal pores from a hydrophobic to a hydrophilic state. A special preparation method is then used to obtain the noble metal catalyst Pt / O-NCP. During catalyst loading, most Pt nanoparticles are located within the mesopores of the support, maximizing the direct contact between the polymer and Pt (sulfonic acid poisoning). This solves the problems in existing catalysts where Pt nanoparticles are prone to dissolution and carbon corrosion under voltage fluctuations, leading to Pt growth and aggregation, thus avoiding the reduction in catalytic performance caused by a decrease in the active surface area of ​​the catalyst. Furthermore, this catalyst can also address the significant decrease in overpotential of ordinary carbon support materials under low humidity, resolving the typical performance degradation of PEMFCs under low humidity conditions.

The application relates to the technical field of steel production, in particular to a carbon dioxide corrosion-resistant steel and a preparation method thereof.The chemical components of the steel include C, Cr, Mn, Nb, Si, P, S and Fe; wherein the content of C is 0.05-0.15 wt%, the content of Cr is 1-3 wt%, the content of Mn is 1-1.5 wt%, the content of Nb is 0.025-0.055 wt%, the content of Si is 0.2-0.3 wt%, the content of P is <=0.008 wt%, and the content of S is <=0.002 wt%. The application solves the technical problem that the existing steel has poor carbon dioxide corrosion resistance.

This utility model discloses a high-sealing, carbon dioxide corrosion-resistant, heat-insulating oil casing, specifically relating to the field of heat-insulating oil casing technology. It includes a pipe body and a coupling. The coupling is threadedly connected to the outer end of the pipe body. A fixing plate is fixedly installed on one side of the outer surface of the pipe body. The fixing plate has multiple fixing holes inside, and two springs are fixedly installed on the inner top surface of each fixing hole. In practical operation, the end of the pipe body is inserted into the coupling and rotated to achieve a threaded connection. Under the elastic action of the springs, a limiting hook extends to the side outside the fixing hole and inserts into the limiting hole of the connecting plate, thus engaging with the threaded connection to assemble and connect the pipe body and the coupling. The elastic force of the springs provides continuous clamping force, effectively offsetting the preload attenuation caused by vibration. The insertion and engagement of the limiting hook and the limiting hole further restricts axial displacement, effectively preventing loosening between the pipe body and the coupling from affecting the transport of heavy oil.

The present invention provides a film electrode assembly with high carbon corrosion resistance. [Solution] The membrane electrode assembly comprises an anode-side electrode catalyst layer, a solid polymer electrolyte membrane, and a cathode-side electrode catalyst layer in this order. The anode-side electrode catalyst layer and the cathode-side electrode catalyst layer each contain catalyst particles, a carbon support carrying the catalyst particles, and a polymer electrolyte, and the volume density of the anode-side electrode catalyst layer is smaller than the volume density of the cathode-side electrode catalyst layer.

The invention relates to the technical field of fuel cells, in particular to a hydrogen fuel cell protection system and a control method, and the system comprises a relay array which comprises a plurality of relays, and two endpoints of each relay are connected in parallel to the positive electrode and the negative electrode of a corresponding single cell; the shut-off valve array comprises a plurality of shut-off valves, each shut-off valve is arranged on an anode intake manifold of the corresponding single cell and controls the anode intake manifold to be opened and closed, the anode intake manifolds and a hydrogen intake manifold of the hydrogen fuel cell are connected with a controller, and the controller is connected with the relay array and the shut-off valve array. And the fault level of each single battery is determined according to the operation parameters of each single battery, a control instruction is generated according to the fault level, and at least one of the relay array and the stop valve array is controlled by using the control instruction. Therefore, the problems of irreversible carbon corrosion reaction and the like of the anode of the faulted battery caused by reverse current of the battery after the fuel battery single battery breaks down and hydrogen is cut off are solved.

The present application relates to a kind of manufacture of pipeline steel hot-rolled coil for straight seam welded pipe, especially 450MPa grade carbon dioxide corrosion resistant steel and its manufacturing method.The chemical composition in steel contains:C, Si, Mn, P≤0.020%, S≤0.002%, Cr, Cu, V, Ti, Al, N≤0.008%, the rest is Fe and inevitable element.The transverse yield strength of steel plate is 470MPa or more, tensile strength is 580MPa or more, yield ratio≤0.87, elongation A 50mm ≥39%, impact energy at-40 ℃ is 280J or more, drop hammer at-20 ℃≥95%, according to ASTM-G111 corrosion standard, average corrosion rate in carbon dioxide environment is less than 0.10mm / a;Longitudinal yield strength is 460MPa or more, tensile strength is 570MPa or more, yield ratio≤0.86, elongation A 50mm ≥38%.

The invention discloses a platinum cluster enhanced electro-catalytic oxygen reduction activity catalyst, catalyst slurry, a working electrode and a preparation method, the catalyst comprises a graphite flake loaded with a low loading amount of Pt nanocluster, namely Pt-D / O-C; wherein the low loading capacity is less than 1.5 wt%. According to the present invention, the cheap, easily available and efficient carbon material is adopted as the electrode, such that the operation is simple, the carbon electrode has good stability and can be recycled for multiple times, the ORR activity can be enhanced and the cost can be reduced in the aspect of the effect, the problems of carbon corrosion, Pt aggregation and the like during the reaction process can be avoided, and the great application potential in the industry can be provided. Meanwhile, the catalyst slurry, the working electrode and the preparation method provided by the invention also have the same effect.

The application discloses a high-strength oil casing pipe with carbon dioxide corrosion resistance, which contains Fe and inevitable impurities, and additionally contains the following chemical elements: C: 0.10-0.20%, Si: 0.10-0.80%, Mn: 0.10-1.50%, Cr: 3-5%, Mo: 0.10-0.70%, Al: 0.01-0.10%, V: 0.10-0.20%, Ni: 0.1-1.0%, Ce: 0.002-0.01%, and La: 0.002-0.01%. Correspondingly, the application also discloses a manufacturing method of the high-strength oil casing pipe with carbon dioxide corrosion resistance. The oil casing pipe with super-high strength and excellent carbon dioxide corrosion resistance can be obtained through reasonable chemical element component design.

The utility model provides a high-efficiency grinding machine for a low-carbon corrosion-resistant stainless steel pipe, which comprises a foundation plate, a support, a top plate, a screw driving structure, a driving structure, a sand blasting grinding structure, a sand discharging structure, a rotating motor and a steel pipe, the screw driving structure is mounted between the foundation plate and the top plate; the driving structure is fixedly mounted at the top of the top plate and is in transmission connection with the screw driving structure, the sand blasting and grinding structure is mounted on the screw driving structure, and the sand discharging structure is fixedly mounted on one side of the sand blasting and grinding structure; the rotating motor is fixedly installed on the surface of the foundation plate, and the steel pipe is clamped and fixed to the top of the rotating motor. Due to the arrangement of the sand blasting and polishing structure and the sand discharging structure, the surface treatment effect is uniform, waste sand and waste material management is perfect, the automation degree is high, and the labor intensity is low.

The invention belongs to the technical field of nano materials and electro-catalysis, and discloses a sandwich-structure nano-particle catalyst and a preparation method thereof.The sandwich-structure nano-particle catalyst comprises a molybdenum carbide nano-particle inner core and a shell layer covering the molybdenum carbide nano-particle inner core, the shell layer comprises platinum or an alloy consisting of platinum and at least one element selected from transition metal, rare earth metal or metalloid; molybdenum carbide can be used as an inner core, platinum or platinum-based alloy can be used as a shell layer, platinum dissolution and carbon corrosion can be synchronously inhibited, and the service life of the fuel cell catalyst is remarkably prolonged.

The application provides a control method for eliminating high potential of fuel cell start-stop, comprising: obtaining the stack operation state of a fuel cell system, obtaining the cathode potential data of the stack under the start condition and the shutdown condition based on the operation state; judging whether the fuel cell system is in a high potential state according to the cathode potential data, and triggering a recovery module to perform a high potential elimination operation if the fuel cell system is in the high potential state. The stack is monitored in real time, and the working condition of the fuel cell is dynamically adjusted, so that the purpose of reducing the cathode high potential condition is achieved, and the fuel cell stack can work efficiently for a long time. The occurrence of the cathode high potential is reduced by controlling the adjustable load element, and the carbon corrosion problem is further inhibited; the occurrence of the high potential is reduced, so that the attenuation of the fuel cell performance caused by the carbon corrosion under the high potential condition is reduced, and the service life of the fuel cell is prolonged.

The present application relates to a kind of straight seam welded pipe for pipeline steel hot-rolled plate manufacturing, especially to a kind of 450MPa grade low yield ratio resistance carbon dioxide corrosion steel and its manufacturing method.The chemical composition in steel contains:C, Si, Mn, P≤0.020%, S≤0.002%, Cr, Cu, Nb, Ti, Al, Zr, N≤0.008%, the rest is Fe and inevitable element.The transverse yield strength of the steel plate of the present application is 480MPa or more, the tensile strength is 610MPa or more, the yield ratio is less than 0.80, the elongation A 50mm ≥39%, the transverse-40 ℃ impact energy is 220J or more, according to ASTM-G111 corrosion standard, the average corrosion rate in carbon dioxide environment is <0.15mm / a.

The application discloses a carbon-based coating of a fuel cell metal bipolar plate and a preparation method thereof. The carbon-based structure coating of the metal bipolar plate comprises, from top to bottom, a conductive functional amorphous carbon layer, a compact amorphous carbon corrosion barrier layer and a flexible metal Ti transition layer. The flexible metal Ti transition layer is prepared by a magnetron sputtering process, the sputtering target material is pure metal Ti, and the thickness of the flexible metal Ti transition layer is 100 nm. The carbon material is used as the main body of the coating, so that the preparation cost of the protective coating can be effectively reduced. The amorphous carbon coating prepared by the magnetic filtering cathode vacuum arc technology and the cathode vacuum arc technology can effectively shorten the deposition time and improve the production efficiency. After the prepared carbon-based protective coating is subjected to constant potential corrosion at 0.6 V for 7200 min, the surface morphology of the coating does not change, and the contact resistance of the coating still meets the use standard.

The invention discloses a preparation method of a nitrogen-doped hierarchical pore carbon material and a platinum-based catalyst, and belongs to the technical field of fuel cell catalysts. The preparation method comprises the following steps: weighing starch and inorganic salt according to a certain proportion, mixing and uniformly grinding, placing in a tubular furnace, carrying out high-temperature carbonization pore-forming treatment, and then carrying out acid pickling and drying to obtain a carbon precursor; and mixing the carbon precursor with a nitrogen-doped nitrogen source, and carrying out secondary annealing treatment to obtain the nitrogen-doped hierarchical pore carbon carrier. Taking the carbon material as a carrier, adding platinum salt and a urea solution, heating for reaction, washing and drying after the reaction is completed, and performing heat treatment in a reducing atmosphere to obtain the platinum-carbon catalyst with high carbon corrosion resistance. The nitrogen-doped hierarchical porous carbon material prepared by the invention has the characteristic of high specific surface area, and the mesopore proportion is gt; 50%; nitrogen is doped in crystal lattices of the carbon carrier, so that the structural stability of the carbon carrier is enhanced. The platinum-based catalyst prepared by the invention shows excellent catalytic activity.