3311results about "Hot-dipping/immersion processes" patented technology

The invention discloses a 340MPa grade P-containing hot-dip galvanized iron alloy high-strength IF steel, the chemical composition of which is as follows by weight: C: ≤0.003%, Si: ≤0.03%, Mn: 0.35-0.65%, P: 0.03-0.075%, S≤0.010%, Als: 0.020-0.045%, Nb: 0.008-0.015%, Ti: 0.02-0.03%, B: 0.0004-0.0010%, N≤0.0035%, and the remainder is Fe and unavoidable impurities; The elements also meet the following restrictions: calculated according to the corresponding weight percentage of each element, 10C+3N+2S≤Ti+2Nb≤12C+3N+2S, 60B≤P≤80B; the present invention adds P element to IF steel, and through composition and process optimization control, obtains a P-containing hot-dip galvanized iron alloy high-strength IF steel with a yield strength of 180-320 MPa, a tensile strength of 340-440 MPa, an elongation of 35-46%, a value (average plastic strain ratio) ≥1.8, high surface quality, high formability, and good cold brittleness.

The invention relates to the technical field of steel pipe hot galvanizing, in particular to steel pipe hot galvanizing automation equipment and a galvanizing technology.The steel pipe hot galvanizing automation equipment comprises a zinc liquid pool, a second horizontal moving part is fixedly arranged on one side of the zinc liquid pool, placing tables are arranged on one side of the second horizontal moving part at intervals, and the upper ends of the placing tables are in threaded connection with blocking strips through bolts; a moving assembly is arranged above the molten zinc pool, a stirring assembly is arranged on the outer surface of the moving assembly, a deslagging assembly is arranged at the upper end of the molten zinc pool, first electric telescopic rods are detachably connected to the two sides of the molten zinc pool through supports, push plates are fixedly arranged at one ends of the first electric telescopic rods, and an air blowing part is arranged on one side of the molten zinc pool in a penetrating mode. Through the arrangement of the moving assembly and the slag removal assembly, automatic hot galvanizing of the special-shaped steel pipe is achieved, automatic removal of zinc slag on the surface of zinc liquid can be achieved, through the arrangement of the moving assembly, the stirring assembly and the first electric telescopic rod, residues of the zinc liquid can be reduced, and the possibility of zinc tumor occurrence is reduced.

The invention discloses an intelligent closed-loop control system for a passivation solution in a hot galvanizing process, particularly relates to the technical field of industrial process automatic control, and is used for solving the problem of large parameter fluctuation caused by the fact that an existing passivation solution control mode lags behind intermittent production takt change. A signal monitoring module identifies a production cycle and calculates an estimated compensation value, an entropy weight generation module generates a weight distribution coefficient based on symbol sequence information entropy, and a data fusion module fuses the estimated compensation value and real-time monitoring data to generate a cooperation instruction. The trajectory prediction module simulates and generates a virtual change trajectory and a dynamic envelope line thereof according to the instruction, the envelope monitoring module monitors the running state of the real trajectory in the envelope line in real time, and the execution early warning module executes the instruction or generates an early warning signal according to the monitoring result. According to the system, prospective prediction and self-adaptive control of parameters of the passivation solution are realized, and the control precision and stability are effectively improved.

The invention discloses a composite negative electrode material and a preparation method thereof and a lithium battery, the composite negative electrode material provided by the invention comprises a three-dimensional porous carbon material, and a lithium-loving metal and a lithium metal which are loaded on a three-dimensional porous carbon skeleton, and the three-dimensional porous carbon material is prepared by taking a ZIFs precursor as a raw material. The three-dimensional porous carbon material prepared by taking the ZIFs precursor as a raw material has a Zn / N-containing double-doped three-dimensional porous carbon skeleton, so that the problems of poor conductivity, insufficient lithium storage aperture and the like of the existing carbon skeleton are solved; a plurality of lithium-loving metal nanoparticles are loaded on the surface of the carbon skeleton, so that the lithium-loving property and the electron conductivity of the carbon skeleton are further enhanced, the uniform deposition of lithium is facilitated, and the growth of dendrites is inhibited; the porous carbon skeleton limits the lithium deposition space, the doped nanoparticles provide lithium-loving sites to guide uniform nucleation, the dual mechanisms synergistically inhibit dendritic crystal growth, and the safety of the lithium metal negative electrode is improved.

The invention discloses a method for improving corrosion resistance of steel, and belongs to the technical field of metal protection. The method for improving the corrosion resistance of the steel comprises the following procedures of acid pickling, rinsing, drying, reduction, hot dipping, passivation, drying and packaging. Replacing a plating assisting process in the hot dipping process with a thermal reduction process; and in the thermal reduction process, hydrogen with the volume content of 3-25% is adopted for thermal reduction. A plating assisting technology in a traditional hot dipping technology is replaced with a reduction technology, the steel obtained after acid pickling is dried and then fed into the atmosphere box, a small amount of iron oxide remaining on the surface of the steel is reduced into sponge iron in the hydrogen reduction atmosphere, the surface of the steel keeps active, and then a zinc-based or zinc alloy plating layer can be better plated; therefore, the corrosion resistance of the steel is greatly improved, and the service life is prolonged.

The invention relates to the technical field of steel-cored aluminum stranded wires, and provides an overhead high-conductivity steel-cored aluminum stranded wire which comprises a galvanized steel core and aluminum wires stranded on the surface of the galvanized steel core, the galvanized steel core is formed by stranding 19 steel wires, and the aluminum wires are divided into two layers and stranded on the outer side of the galvanized steel core; the preparation method of the galvanized steel core comprises the following steps that after being galvanized, a steel wire is added into a passivation solution to be passivated, and the galvanized steel core is obtained after drying and twisting; the passivation solution is prepared from the following raw material components: waterborne acrylic resin, nickel nitrate, sodium carboxymethyl cellulose, sodium dodecyl sulfate, functionalized single-walled carbon nanotubes and water; the functionalized single-walled carbon nanotube is prepared from the following raw materials: a single-walled carbon nanotube and 5-carboxyl-2, 3-diaminopyridine. According to the technical scheme, the problem that the corrosion resistance of the manufactured overhead steel-cored aluminum stranded wire is poor due to the fact that the corrosion resistance of a galvanized steel core is poor in the prior art is solved.

The invention discloses a controllable preparation method for the eutectic phase size of a medium-aluminum type zinc-aluminum-magnesium coating, which comprises the following steps of: preparing the following components in percentage by weight: 0.01 to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.15 to 0.26 percent of Mn, 0.15 to 0.26 percent of P, less than or equal to 0.01 percent of S, 0.02 to 0.06 percent of Als, less than or equal to 0.3 percent of Ti and the balance of Al; the base material is subjected to annealing treatment, zinc plating treatment and post-plating treatment after multiple working procedures, and the plating layer with the ternary eutectic structure morphology is obtained. Through optimization of base material components, the galvanizing process and the cooling process, accurate control over the eutectic phase size in the plating layer is achieved, and therefore the corrosion resistance, the adhesive force and the uniformity of the plating layer are improved.

The utility model relates to an automatic tinning device for a motor stator, and belongs to the technical field of motor manufacturing equipment. Comprising a working table, a water storage disc, a lifting rotating mechanism and a tin furnace assembly, a bracket is arranged on the working table through the lifting rotating mechanism, the water storage disc is arranged on the working table on one side of the bracket, the tin furnace assembly is arranged on the working table on the other side of the bracket, the tin furnace assembly comprises a tin furnace body and a tin scraping piece, and the tin furnace body is clamped on the working table through a limiting block; and a tin scraping piece is arranged on the working table on one side of the tin furnace body. According to the automatic tin coating device for the motor stator, the manual labor amount is effectively reduced, the tin coating working efficiency is improved, meanwhile, it is guaranteed that the tin coating quality consistency is good, and the problems of uneven tin coating and insufficient soldering are avoided.

The invention relates to the technical field of metallurgy, in particular to a zinc-aluminum-magnesium coating preparation method capable of keeping coating integrity in a corrosion environment, alloy steel with the thickness of 1.8 mm or above is adopted, in the preparation process, a continuous annealing process adopts a three-section heating process, and an after-plating cooling process adopts a three-section variable-temperature cooling process; a plating solution adopted by the zinc-aluminum-magnesium plating layer comprises the following chemical components in percentage by weight: 9-11% of Al, 2.8-3.1% of Mg, less than or equal to 0.1% of rare earth elements, 0.1-0.2% of Si and the balance of Zn and inevitable impurities; according to the invention, the key problems of poor coating structure uniformity, contradiction between scratch resistance and self-repairing capability, limitation of super-thick coating preparation process, insufficient adaptability to extreme corrosion environment and the like of the existing zinc-aluminum-magnesium coating technology in industrial application are solved, and the coating can efficiently keep structural integrity in the industrial corrosion environment, and can be widely applied to the industrial corrosion environment. And meanwhile, the requirements of super-thick coating preparation, complex working condition adaptability and low-cost industrial production are met.

The invention relates to the technical field of metal material surface treatment, in particular to a preparation method of a hot galvanizing layer of a hot-rolled high-strength steel plate with high corrosion resistance. Firstly, a hot-rolled steel plate is formed after smelting, continuous casting and hot rolling; secondly, the corrosion-resistant hot-rolled high-strength steel plate is subjected to oil removal through alcohol and then put into a heat treatment furnace into which shielding gas can be introduced for hydrogen reduction; then, the corrosion-resistant hot-rolled high-strength steel plate subjected to hydrogen reduction is placed in a plating assistant agent to be soaked; then, the corrosion-resistant hot-rolled high-strength steel plate soaked with the plating assistant is soaked in a Zn-Al-Mg alloy plating solution for hot dipping; and finally, the hot-rolled high-strength steel galvanized plate obtained after hot dipping is taken out of the plating solution in the high-purity Ar protective atmosphere, and the hot-rolled high-strength steel galvanized plate is placed in a protective cover full of the high-purity Ar protective atmosphere to be naturally cooled to the room temperature. The corrosion resistance of the Zn-Al-Mg alloy coating on the surface of the hot-rolled steel plate can be effectively improved, and meanwhile, compared with other hot galvanizing technologies, the corrosion resistance is higher.

The invention discloses a zinc skin and zinc powder cleaning device for a galvanized sheet, which relates to the field of galvanized sheet coating cleaning, and comprises a zinc skin and zinc powder removing box arranged between an outlet of a sheet galvanizing cooling section and a tension roller, and two sheet guide parts symmetrically arranged in the zinc skin and zinc powder removing box, the supporting guide roller is arranged in the zinc skin and zinc powder removing box and located between the two plate guide parts, the swinging zinc removing device is arranged with the supporting guide roller as the circle center, and the zinc slag sucking and removing device and the air injection zinc removing device are further included. According to the device, the removal rate of zinc skin and zinc powder on the surface of the galvanized plate is high, meanwhile, zinc slag can be recycled in time, the removed zinc slag is prevented from secondarily polluting the plate surface, meanwhile, the tool bits which work alternately can prevent the tool bits from being overheated during continuous work, and the service life of the tool bits is prolonged.

The invention discloses a production process of high-strength anti-distortion cold-rolled strip steel. The production process comprises the links of raw material preparation, cold rolling, heat treatment, surface treatment and quality detection. Selecting medium-carbon steel with specific components as raw materials, and controlling the tolerance of hot-rolled strip steel; a six-roller unit is adopted for multi-pass rolling in cold rolling, and a plate shape control technology is matched; continuous annealing and gradient quenching-isothermal tempering are applied to heat treatment, so that a specific structure gradient is formed, and the distortion rate is reduced; the surface is subjected to acid pickling, hot galvanizing and a nano ceramic composite coating, so that the corrosion resistance and the wear resistance are improved; and the quality is guaranteed through online detection and sampling inspection. The strip steel produced through the technology is high in strength, good in toughness, high in corrosion resistance and suitable for the high-requirement field.

The invention relates to the field of coating materials, and discloses a passivation solution for a hot-dip galvanized workpiece as well as a preparation method and a use method.The passivation solution is prepared from organic pottery clay, titanium dioxide, ethylene-vinyl acetate copolymer emulsion, waterborne epoxy silicon resin, a silane coupling agent, a coloring agent, filler, an auxiliary and water. The problem of light pollution in areas with high illumination intensity can be effectively solved, workpieces and vegetation in natural scenic areas are organically fused to form beautiful scenery lines, and the technical problems of high cost and weak corrosion resistance of green coatings caused by the fact that green towers are achieved by coating green paint at present can be effectively solved. And the pole tower is green, attractive and good in economic benefit.

The invention belongs to the field of metal materials, and provides 800MPa-grade alloyed galvanized complex phase steel with ultrahigh reaming performance for automobiles and a preparation method of the 800MPa-grade alloyed galvanized complex phase steel, and the steel plate comprises the following components in percentage by weight: 0.12%-0.17% of C, 1.90%-2.25% of Mn, 0.30%-0.65% of Si, 0.020%-0.040% of Ti, less than or equal to 0.030% of P, less than or equal to 0.002% of N, less than or equal to 0.005% of S and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting, hot rolling, acid pickling, cold rolling, continuous annealing galvanizing and finishing. The microstructure of the steel plate produced by the method is mainly composed of bainite and tempered martensite, and the steel plate has ultrahigh hole expansion rate and excellent forming performance.

The invention belongs to the technical field of steel production, and relates to a method for producing a low-cost high-strength galvanized sheet based on thin-strip cast rolling. After molten steel is subjected to thin-strip continuous casting to obtain a casting strip, the casting strip is rolled into a thin strip in a single pass mode, the thin strip is coiled after being cooled through aerial fog, then hot-dip galvanizing is conducted on a continuous hot-dip galvanizing production line after acid pickling is conducted, the annealing temperature of a galvanizing section is 640-720 DEG C, and then the thin strip is placed at the room temperature for more than 35 days after leveling is conducted. According to the method, supersaturated solid solution of C and N atoms in the thin strip casting and rolling sub-rapid solidification process is fully utilized, the high solid solution state is maintained by combining hot rolling and galvanizing section short-time and low-temperature design, finally, strength jump is driven by means of natural aging after production, and the high-strength galvanized plate with good stamping performance is obtained under a simple C-Si-Mn component system. The problems that the high-strength galvanized plate forming capacity of a traditional high-carbon route is insufficient, and the alloy cost of a low-carbon microalloy route is high are solved, and meanwhile carbon emission in the product production process is greatly reduced.

The invention relates to the technical field of hot-dip galvanized steel pipe surface treatment, and discloses a hot-dip galvanized steel pipe internal blowing steam electric heating control method and system. The method comprises the steps that the outer diameter, the wall thickness, the surface temperature and steel type information of a galvanized steel pipe are collected, a steam temperature demand value is calculated, the input number and the power duty ratio of sectional type electric heating pipes are dynamically adjusted according to the temperature rise demand, and the heating power is corrected in real time through a cascade closed-loop control system; and calculating the solidification speed of the zinc liquid according to the wall thickness, and processing the thin-walled pipe in a pulse injection mode. The technical problems that in the prior art, steam temperature control precision is insufficient, heating power distribution lacks dynamic adaptation, temperature closed-loop control response lags behind, and a zinc layer on the inner wall of the thin-walled pipe is uneven are solved.

A steel sheet, coated with a metallic coating including, by weight percent, from 7.5 to 9.0% of zinc, from 1.1 to 4.0% of silicon, from 1.1 to 8.0% of magnesium, up to 3.0% of iron, optional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each element being less than 0.3%, optionally up to 100 ppm of Calcium and unavoidable impurities up to 0.02%, a balance being aluminum, and wherein the coating weight of the metallic coating is from 50 to 500 g / m2 for the sum of both sides of the-steel sheet.

A steel sheet having a tensile strength (TS) of 780 MPa or more and less than 1180 MPa, high LME resistance, and good weld fatigue properties. The steel sheet has a specific chemical composition and a specific steel microstructure. Crystal grains containing an oxide of Si and / or Mn in a region within 4.9 μm in a thickness direction from a surface of the steel sheet have an average grain size in the range of 3 to 10 μm, the lowest Si concentration LSi and the lowest Mn concentration LMn in the region within 4.9 μm in the thickness direction from the surface of the steel sheet and a Si concentration TSi and a Mn concentration TMn at a quarter thickness position of the steel sheet satisfy a specified formula.

The invention discloses an alloyed hot-dip galvanized steel sheet, a substrate of the alloyed hot-dip galvanized steel sheet contains 0-1.0% by mass of Si, the average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel sheet is 7-10% by mass, and the surface phase structure of the alloyed hot-dip galvanized layer contains a columnar zinc-iron alloy phase, the ratio R of the length to the width of the columnar zinc-iron alloy phase is greater than or equal to 2 and less than or equal to Rlt; 7. The pulverization grade of the alloyed hot-dip galvanized steel plate is smaller than or equal to 6 grade, and the pulverization resistance is good. The invention further discloses a manufacturing method of the alloyed hot-dip galvanized steel plate, the manufacturing method is suitable for the low-silicon steel plate, and the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage in the continuous annealing step, the dew point DP in the soaking stage and the alloying temperature in the alloying step, so that the pulverization resistance of the steel plate is improved.

A galvannealed steel sheet includes: a cold-rolled steel sheet having a chemical composition containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and a galvannealed layer formed on one or both surfaces of the cold-rolled steel sheet. An Fe-based electroplating layer is absent between the galvannealed layer and the cold-rolled steel sheet. In an emission intensity profile, a value of (ISi,Fe) / (ISi,bulk) is 0.90 or less, where (ISi,Fe) denotes an average Si intensity in a range from an interface between the galvannealed layer and the cold-rolled steel sheet to +0.5 μm towards the cold-rolled steel sheet, and (ISi,bulk) denotes an average Si intensity in the cold-rolled steel sheet. An average value of C concentration in a range of 10 μm to 20 μm in a thickness direction from the interface between the galvannealed layer and the cold-rolled steel sheet is 0.10 mass % or less.

The invention discloses a hot-dip galvanizing strip steel production waste gas treatment mechanism, and relates to the technical field of hot-dip galvanizing strip steel production, the hot-dip galvanizing strip steel production waste gas treatment mechanism comprises a treatment tower body, the treatment tower body comprises a gas inlet dispersion area, a treatment area I, a treatment area II, a treatment area III and a gas exhaust area which are sequentially distributed from bottom to top, and the left side of the upper part of the gas inlet dispersion area communicates with a gas inlet; the top of the exhaust area is communicated with an exhaust port, and the treatment tower body is provided with a spraying unit for spraying alkaline liquid drops to the acid waste gas. The device has the advantages that the main movable assembly and the driving assembly are matched to drive the filler to move in a small range in the annular space, and the filler collides with each other, so that the surface and internal pores are prevented from being blocked by salt crystals and other dirt generated in the reaction; the disturbance block further disturbs the motion trail of the filler while the filler collides in a small range all the time; and spraying operation is matched for flushing, so that the anti-blocking effect is further improved, and the waste gas treatment efficiency is improved.

The invention discloses an energy-saving type multifunctional galvanizing furnace for hot galvanizing, relates to the technical field of metal surface treatment, and aims to solve the technical problem that the galvanizing quality of a workpiece is affected due to the fact that the temperature of molten zinc on the surface of a current open type galvanizing furnace is unstable. The lifting mechanism is arranged at the top of the galvanizing furnace, the lifting mechanism comprises two cover plates for blocking an opening of the galvanizing furnace, a driving assembly for controlling the two cover plates to move in opposite directions and a hanging bracket for clamping and limiting a workpiece, and the hanging bracket can control the workpiece to ascend and descend through the displacement of the two cover plates. The driving assembly is used for controlling the two cover plates to move in the opposite directions, synchronous linkage of workpiece lifting is achieved, a furnace body opening can be tightly plugged in a non-operation state, the furnace body opening is automatically opened when workpieces are galvanized, the proper opening size can be automatically adjusted according to the sizes of the workpieces, the size of the furnace body opening is automatically adjusted, and the service life of the furnace body is prolonged. And heat loss is reduced, and the workpiece surface galvanizing quality is improved.

The invention relates to the technical field of bolts and provides a corrosion-resistant hot-dip galvanized bolt and a preparation method thereof. The corrosion-resistant hot-dip galvanized bolt is obtained by subjecting a bolt body to electroplating and hot-dip galvanizing. The bolt body is composed of the following components in percentage by weight: Mn 0.18%-0.58%, Te 0.02%-0.05%, Bi 0.004%-0.015%, Eu 0.05%-0.25%, Ge 0.015%-0.045%, Ti 0.02%-0.06%, V 0.05%-0.10%, Co 0.20%-0.50%, Nb 0.05%-0.15%, C 0.20%-0.30%, Mo 0.10%-0.30%, B 0.002%-0.005%, S≤0.01%, P≤0.005%, and the remainder is iron and unavoidable impurities. The above technical solution solves the problems of poor tensile strength of the bolt body, uneven zinc coating and poor corrosion resistance in hot-dip galvanized bolts in the related art.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for preparing an aluminum-iron composite material based on microtexture.The method comprises the steps that S1, an iron matrix is obtained and pretreated; s2, the iron matrix is placed in deionized water; s3, preparing a microstructure on the surface of the iron matrix; and S4, the iron matrix is adopted for liquid-solid composite casting to prepare the aluminum-iron composite material. On one hand, the micro-texture prepared in deionized water is more uniform, the roughness is reduced compared with that of the micro-texture prepared in air, and the wettability of an aluminum alloy melt when the aluminum alloy melt makes contact with an iron matrix is well improved; and on the other hand, when the micro-texture is prepared in the deionized water, the deionized water can effectively enable slag generated when the surface of the iron matrix is subjected to laser etching not to be deposited in the micro-texture any more, so that the interior of the micro-texture is more uniform and smoother, the filling rate of an aluminum alloy melt is effectively increased, and the problem of interface cracking after aluminum-iron bimetal solid-liquid compounding is solved.

The invention discloses an enhanced tensile wear-resistant multi-twisted steel wire rope, which relates to the technical field of steel wire ropes, and structurally comprises a multi-twisted steel wire rope formed by twisting three sub-ropes in a left-to-right interactive manner, and each sub-rope is formed by twisting six stranded ropes in a right-to-right interactive manner; the aluminum-based carbon fiber composite core serves as the center of the stranded rope, and the gradient functional layer comprises six center steel wires on the inner layer, twelve micro-arc oxidation concave steel wires on the middle layer, eighteen graphene / zinc-aluminum coating convex steel wires on the outer layer and twelve phase change lubricating fiber bundles on the surface layer. The outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repairing microcapsules, a boehmite / silane interface bonding layer and an Al2O3 / PEEK abrasion-resistant coating. The tensile strength and the structural stability are improved through a three-stage twisting process; the aluminum-based carbon fiber composite core and the gradient functional layer synergistically enhance core bearing, wear resistance and corrosion resistance; the phase change lubricating fiber bundles release lubricating components during friction, and damage repair is achieved through the self-repairing sealing layer; and the interface bonding layer and the wear-resistant coating strengthen the surface adhesive force and the wear resistance.

Provided is a plated steel material having a plating layer disposed on the surface of the steel material, wherein: the plating layer is a Zn-based plating layer that has an average chemical composition containing 4.0-70.0 mass% of Al and 0.3-12.5 mass% of Mg, with the balance consisting of Zn and impurities; the metal structure of the plating layer includes at least a Zn phase, an Al phase, and a MgZn2 phase; and when an average KAM value is measured with respect to a rectangular measurement region of 125 μm × 300 μm set on the surface of the plating layer, by means of EBSD with a measurement interval of 0.25 μm / step, the average KAM value (KZn) of the Zn phase is in the range of 0.30-1.70°, the average KAM value (KAl) of the Al phase is in the range of 0.20-1.00°, and the average KAM value (KMgZn2) of the MgZn2 phase is in the range of 0.20-1.00°.

A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.

The invention relates to an airflow cooling device for improving the cooling efficiency of a photovoltaic welding strip, and belongs to the technical field of photovoltaic welding strip production. The airflow cooling device comprises a base, a cooling box is fixed to the upper surface of the base, a feeding port is formed in one side of the cooling box, a discharging port is formed in the other side of the cooling box, an air cooler is fixed to the top of the cooling box, and an air guide pipe is fixed to the groove top of an inner cavity of the cooling box; according to the airflow cooling device capable of improving the cooling efficiency of the photovoltaic welding strip, the distance between the air opening and a copper wire of the photovoltaic welding strip is adjusted through the electric push rod, so that cold air makes contact with the copper wire of the photovoltaic welding strip at the optimal temperature, and the cooling efficiency of the photovoltaic welding strip is improved while airflow cooling is conducted. The multiple cooling air ports continuously move in a reciprocating mode, cold air can cover the surface of the photovoltaic welding strip copper wire more evenly, the relative speed between the nozzle and the photovoltaic welding strip copper wire can be reduced, the time of the photovoltaic welding strip copper wire acted by cooling airflow is prolonged, the contact time is prolonged, and the cooling effect is improved.

The present application relates to the technical field of automobile bolt plating, in particular to a hot galvanizing device for automobile bolts, which comprises a processing table, a galvanizing cylinder, a control case, a driving assembly, a lifting assembly and a hanging plate, etc., one side of the processing table is provided with a side plate, the arc-shaped groove on the side plate cooperates with the moving assembly driven by the first motor, so that the base is automatically at the lowest point in the loading and unloading stations, the galvanizing station is precisely aligned with the galvanizing cylinder, the bolts are independently hung through the annular frame, the hanging plate adopts a detachable clamping structure, the second motor drives the bolts to rotate at a constant speed, cooperates with the arc-shaped protrusions at the bottom of the galvanizing cylinder to make the bolts reciprocate and jump, and the lifting assembly controls the immersion depth of the bolts, the device solves the problems of bolt occlusion, collision and uneven plating in the traditional frame soaking process, and through the independent hanging, stable rotation and jumping design, the surface precision of the bolts and the uniformity of the plating layer are ensured.

A plated steel material including a plated layer and a base steel material. In a cross section perpendicular to a surface of the plated steel material, a length L of a boundary line between the plated layer and the base steel material satisfies (L−L0) / L0×100≥2.0 (%), wherein L0 is a linear distance between ends of the boundary line in an observation region, and L is a length of the boundary line between the ends. The plated layer includes a first region where an Fe concentration is less than 5.0 mass %, a second region where an Fe concentration is 5.0 mass % or more and less than 30.0 mass %, and a third region where an Fe concentration is 30.0 mass % or more and 80.0 mass % or less, the first region including an Al-containing phase at an area fraction of 5% or more.