349 results about "Hot-dip galvanization" patented technology

According to the technical scheme, the efficient hot-dip galvanizing method based on the zinc liquid purification technology comprises the following steps of incoming material inspection, degreasing, acid pickling, rinsing, plating assisting, drying, hot-dip galvanizing, zinc draining and cooling, and the hot-dip galvanizing process is dynamically matched with electromagnetic stirring strength through gradual temperature control; based on a temperature-iron content response curve, parameters of all procedures are accurately controlled, temperature dynamic adjustment is achieved, collaborative optimization of the zinc liquid purification and slag salvaging process is achieved, and the method has the advantages that zinc slag is reduced, the coating uniformity is improved, and energy consumption is reduced.

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.

The utility model relates to a novel hot galvanizing machine for section steel, which belongs to the technical field of section steel galvanizing equipment and comprises a frame and a zinc pot arranged below the frame, an ash scraping mechanism used for scraping zinc ash on the surface of the zinc pot to the end of the zinc pot is mounted on the frame, and a lifting mechanism and a manipulator are mounted on the frame. Material taking, galvanizing and feeding of profile steel are completed through the mechanical arm, the overall structure is high in automation degree, the labor cost is effectively reduced while the profile steel galvanizing quality is guaranteed and the production efficiency is improved, mechanical operation of ash removal on the surface of zinc liquid before dip plating can be achieved through the ash scraping mechanism, traditional manual ash removal is replaced, and the production efficiency is improved. According to the ash scraping plate for hot-dip galvanizing, free constant-speed walking of the ash scraping plate on the surface of zinc liquid is achieved through movement of the walking trolley and stretching and retracting of the telescopic rod, then zinc ash is scraped to one end of a zinc pot, assistance of manual ash raking is not needed, manual ash raking can be completely replaced, and mechanical ash raking operation before dip galvanizing can be thoroughly achieved.

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.

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.

The utility model discloses a hot-dip galvanizing device for bolt production, which relates to the technical field of bolt production equipment, including a base, a mobile unit fixedly connected to the top of the base, and a lifting unit arranged at the top of the mobile unit; the mobile unit includes a vertical plate fixedly connected to one side of the top of the base, a driving assembly arranged in the middle of one side of the vertical plate, and a linkage assembly arranged at the top of the driving assembly; the lifting unit includes a horizontal plate fixedly connected to the top of one side of the vertical plate, a lifting assembly arranged at the bottom of the horizontal plate, and a placement assembly arranged at the bottom of the lifting assembly. The utility model is a hot-dip galvanizing device for bolt production. When the electric telescopic rod is started, the effective components of the bottom layer of the galvanizing water can be shaken to the upper layer, and during the operation of the electric telescopic rod and the cylinder, the galvanizing water will drive the bolt to shake, so that the original contact points of the bolt with the partition plate and the connecting plate are replaced with different contact points, so that the galvanized part is not easily worn.

The invention relates to the technical field of overhead conductors, and provides a high-conductivity overhead conductor which sequentially comprises a reinforcing core, an inner aluminum wire layer and an outer aluminum wire layer from inside to outside, each of the inner aluminum wire layer and the outer aluminum wire layer is formed by twisting a plurality of aluminum wires, and the reinforcing core is formed by twisting a plurality of galvanized steel wires; the preparation method of the reinforced core comprises the following steps that a steel wire is sequentially subjected to alkali washing, acid pickling, plating assisting, hot-dip galvanizing, passivation and twisting to obtain the reinforced core; during passivation, a passivation solution is prepared from, by weight, 20-25 parts of waterborne polyurethane, 15-20 parts of sodium silicate, 4-8 parts of sodium nitrate, 5-10 parts of modified graphene oxide, 3-5 parts of polyethylene glycol, 0.2-0.4 part of glacial acetic acid and 70-80 parts of water, and the modified graphene oxide is prepared from graphene oxide, a silane coupling agent and 3-aminopyrazine-2-carboxylic acid methyl ester. The problem of poor corrosion resistance of the overhead conductor in the prior art is solved.

Provided is a hot-rolled steel sheet by which excellent LME resistance can be achieved. A hot-rolled steel sheet according to the present disclosure contains, in terms of mass%, 0.030-0.110% C, 0.01-0.50% Si, 0.50-1.50% Mn, 0.025% or less P, 0.010% or less S, 0.010-0.070% Al, 0.0070% or less N, 0.055-0.200% Ti, 0.030-0.150% Nb, 0.0010-0.0050% B, 0-0.20% V, and 0-1.00% Cr, with the remainder consisting of Fe and impurities. The area ratio of bainitic ferrite is 85% or greater, and in a surface layer region from the surface of the hot-rolled steel sheet to a depth position of 0.2 mm in the sheet thickness direction, the total length of the prior austenite grain boundary in which BO2 - is detected by time-of-flight secondary ion mass spectrometry is 1.20-5.00 mm per 100 μm × 100 μm, and the B segregation degree at the prior austenite grain boundary is 40 or greater.

Provided is a hot-rolled steel sheet that exhibits excellent LME resistance. The hot-rolled steel sheet according to the present disclosure contains, in mass%, 0.030-0.110% of C, 0.01-0.50% of Si, 0.50-1.50% of Mn, 0.025% or less of P, 0.010% or less of S, 0.010-0.070% of Al, 0.0070% or less of N, 0.055-0.200% of Ti, 0.020-0.100% of W, 0.0010-0.0050% of B, and the balance being Fe with impurities. In the microstructure, the area ratio of bainitic ferrite is 85% or more. In a surface layer region from the surface of the hot-rolled steel sheet to a depth of 0.2 mm in the sheet thickness direction, the total length of the old austenite grain boundary in which BO2 - is detected by the time-of-flight secondary ion mass spectrometry is 0.80-5.00 mm per 100 μm x 100 μm. The B segregation degree at the old austenite grain boundary is 80 or more.

A method for producing hardened steel components is provided. Sheet bars are cut out from an alloy-galvanized strip made of a hardenable steel alloy and the sheet bars are heated to a temperature that produces a structural change to austenite, preferably to a temperature above the respective Ac3 point. The austenitized sheet bars are then conveyed to a press hardening tool in which the sheet bars are hot formed in a single stroke or multiple strokes by means of an upper and lower tool, wherein the formed sheet bar is cooled against the tools at a speed above the critical cooling rate so that a martensitic hardening occurs. After the galvanization, which can be hot-dip galvanization of the steel strip and before the temperature increase for achieving the austenitization, tin is applied to the surface of the strip or sheet bar.

Disclosed is an alloyed hot-dip galvanized steel sheet in which 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 10-12% by mass, and the surface phase structural composition of the alloyed hot-dip galvanized layer contains a polygonal zinc-iron alloy phase, the ratio R of the length to the width of the polygonal zinc-iron alloy phase is not less than 1 and not more than Rlt; 2. The alloyed hot-dip galvanized steel plate is good in deep drawability. 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, the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage and the dew point DP in the soaking stage in the continuous annealing step and the alloying temperature in the alloying step, and therefore the deep drawing performance of the steel plate is improved.

A molten metal bath composition analysis system includes: a laser oscillator that oscillates a laser beam; a cylindrical probe that includes an opening end immersed in a molten metal bath, supplies an inert gas toward the opening end, and guides the laser beam to the opening end to irradiate a molten metal with the laser beam; and a detector that detects and spectroscopically analyzes plasma emission of the molten metal caused by the irradiation with the laser beam, wherein at least one of the position of the opening end of the cylindrical probe in the molten metal bath and the angle of the cylindrical probe with respect to a vertical direction can be controlled.

This utility model discloses a bearing ring for offshore wind power generation, relating to the field of wind power generation, comprising a lower bearing body and an upper bearing body. This utility model, through the arrangement of the lower bearing body, upper bearing body, and balls, connects the entire bearing ring via the lower and upper bearing bodies. This multi-layer assembly improves the overall strength of the bearing ring. Simultaneously, a sealing sleeve at the connection point protects the lower and upper bearing bodies, enhancing the sealing performance and strength of the bearing ring. The lower bearing body and anti-corrosion coating, applied to the surfaces of both the lower and upper bearing bodies with hot-dip galvanized coating, provide excellent corrosion and wear resistance, offering long-term effective protection for the bearing ring. Furthermore, the technology is mature and relatively low-cost, making it suitable for corrosion protection of offshore wind power bearing rings.

The invention discloses a hot-dip galvanizing process for steel components, relates to the technical field of hot-dip galvanizing, and comprises the following steps: S1: degreasing treatment before plating: adopting a chemical degreasing method, using a degreasing liquid with a specific ratio to treat at 83°C for 25 minutes, and the degreasing equipment is connected with a closed exhaust gas treatment device; S2: pickling treatment before plating: using hydrochloric acid for pickling; S3: water washing treatment before plating; S4: auxiliary plating treatment before plating: using a solvent method to assist plating, reacting at 70°C for 11 seconds, and the auxiliary plating tank is connected with a closed exhaust gas recovery system; S5: hot-dip plating treatment: high-precision control of zinc liquid temperature, and an automatic zinc slag separation device in a zinc pot; S6: cooling treatment after plating; S7: passivation treatment after plating: passivating with a chromium-free passivating liquid at 40°C for 45 seconds, equipped with an automatic circulation filtering system; S8: inspection treatment after plating; in the invention, each link such as degreasing, pickling, auxiliary plating, etc. is equipped with high-efficiency equipment and precise control parameters to achieve high quality, environmental protection, and resource utilization optimization.

Provided are: a hot-dip galvanized sheet that has a TS of 1180 MPa or greater, is excellent in formability, peel strength of a corona bond, and delayed peeling resistance at welded portions, and with which a component can be manufactured with a high dimensional accuracy; and a method for manufacturing the same. A hot-dip galvanized steel sheet according to the present invention is characterized by including a base steel sheet and a hot-dip galvanized layer formed on a surface thereof, wherein: the base steel sheet has a prescribed component composition and a prescribed steel structure; the amount of C contained in the surface layer of the base steel sheet is 0.150% or less; the value obtained by dividing the amount of C contained in the surface layer of the base steel sheet by the amount of C contained in the base steel sheet as a whole is less than 0.85; the hydrogen content [H] (mass ppm) in steel of hydrogen having a binding energy between the base steel sheet and a hydrogen trap site of 10 to 100 kJ / mol is 0.30 mass ppm or less; and the average Vickers hardness of the surface layer of the base steel sheet is denoted by HvS and satisfies formula (1) below.　(1): [H] ≤ (480 - HvS) / 320

This invention discloses a 490MPa grade duplex steel outer plate and its production method. Its chemical composition and mass percentage are as follows: C≤0.09%, Si≤0.08%, Mn: 1.40~1.60%, P: 0.010~0.030%, Al≤0.15%, Cr: 0.20~0.40%, V: 0.13~0.17%, B: 0.002~0.005%, with the balance being Fe and unavoidable impurities. The production method includes converter or electric furnace smelting, RH refining, continuous casting into billets, heating in a heating furnace, hot rolling, coiling, pickling, and hot-dip galvanizing. This duplex steel replaces traditional mild steels such as IF steel and BH steel, and is used to manufacture automotive, especially passenger car, door outer panels, engine hood outer panels, and fender outer panels. It possesses excellent dent resistance, flanging properties, formability, and high surface quality meeting O5 plate requirements, exhibiting superior overall performance.

The invention discloses an office table baffle hot-dip galvanizing treatment device, and relates to the technical field of hot-dip galvanizing processing equipment. The device comprises a hot-dip galvanizing tank and a hanging mechanism for hanging an office table baffle, the hanging mechanism comprises a rectangular frame, and a plurality of hooks are arranged on the bottom side face of the rectangular frame in the length direction. Each hook comprises a vertical rod fixed to the bottom side face of the rectangular frame, one side of each vertical rod is connected with a transverse rod, the end of each transverse rod is provided with a limiting part, the two ends of the office table baffle are each provided with an opening, and the two sides of the rectangular frame are each provided with a limiting structure for blocking and limiting the office table baffle placed on the corresponding transverse rod in a matched mode. According to the invention, the plurality of groups of hooks are arranged on the rectangular frame body, and the limiting insertion rod groups matched with the hooks one by one are arranged, so that during use, the limiting insertion rods are used for limiting the two sides of the office table baffle hung on the hooks; and the problem that the office table baffle is easy to deviate and even fall off due to shaking or gravity action in the zinc dipping and conveying process is solved.

The application provides a method for regulating microstructure of hot-dip galvanizing zinc-aluminum-magnesium alloy through directional solidification technology, and belongs to the technical field of hot-dip plating. The technical problem solved by the application is that, in the actual production process, the accurate control of the cooling process cannot be realized, which leads to serious deficiencies in the accurate regulation of the solidification behavior and the alloy structure of the zinc-aluminum-magnesium coating. The technical scheme adopted by the application is that the coating surface temperature in each cooling process in the actual production process is measured, and the corresponding simulation results are combined to obtain the coating cooling parameters in the actual production process, and on this basis, the directional solidification test parameters are designed, so that the regulation of the microstructure of the hot-dip galvanizing zinc-aluminum-magnesium alloy through the directional solidification technology is realized. The method provided by the application can regulate the phase composition and the area fraction of the eutectic structure of the hot-dip galvanizing zinc-aluminum-magnesium alloy under different cooling processes through the directional solidification technology, so as to provide important theoretical guidance for improving the hot-dip galvanizing zinc-aluminum-magnesium process in the actual production process.

The invention provides a leakproof plating assistant solution for batch hot-dip galvanizing as well as a preparation method and a use method of the leakproof plating assistant solution, and belongs to the technical field of hot-dip galvanizing. The leakage-proof plating assistant solution comprises the following components: 50-180g / L of ammonium chloride, 20-40g / L of sodium chloride, 20-40g / L of sodium 90-100 g / L of zinc chloride; 0.1 to 1.0 g / L of bismuth chloride; 0.2 to 1.0 g / L of an AEO9 active agent; the solvent is water, and the solution pH is controlled to be less than or equal to 3. The using method of the leakage-proof plating assistant solution comprises the steps that S1, a steel workpiece is subjected to oil removal and rust removal, and surface impurities are removed through washing after oil removal and rust removal are completed for standby application; s2, the steel workpiece treated in the step S1 is immersed in a leakage-proof plating assistant solution to be soaked; and S3, the steel workpiece treated in the S2 is subjected to high-aluminum hot-dip galvanizing, cooling and passivation process treatment are conducted after zinc dipping is completed, and hot-dip galvanizing is completed. The leakproof plating assistant solution can be directly used on a batch galvanizing production line, and no plating leakage occurs on the galvanized surface after workpiece plating assistant.

The application discloses a preparation method of wear-resistant and corrosion-resistant hot-dip galvanized steel plate and belongs to the technical field of surface strengthening. The preparation method comprises the following steps: S1, hot rolling; S2, cold rolling; S3, hot-dip galvanizing: the cold-rolled steel plate is heated to 700-718 DEG C and kept for 5-10 min, and then the hot-dip galvanizing is carried out by slowly cooling at 5-8 DEG C / s to 410-415 DEG C, the galvanizing temperature is 440-450 DEG C, the galvanizing time is 18-22 s; after the galvanizing, the galvanized steel plate is cooled and dried, the content of Sn in the melt for the hot-dip galvanizing is 0.8-1.0% by mass percentage, and the rest is Zn; the galvanized steel plate is obtained; S4, surface treatment: the galvanized steel plate is sprayed with a YSn3 coating by using plasma spraying to obtain the wear-resistant and corrosion-resistant hot-dip galvanized steel plate. The wear-resistant and corrosion-resistant hot-dip galvanized steel plate obtained by the application has a double-layer structure, the inner layer is a zinc layer, and the outer layer is covered with a YSn3 layer, so that the wear-resistant and corrosion-resistant hot-dip galvanized steel plate has the effects of wear resistance, corrosion resistance and surface repair.

The hot-dip galvanizing device for bolt production relates to the technical field of bolt production, and comprises a galvanizing box and a rotating box, a fixing frame is fixedly arranged at the upper end of the galvanizing box, a fixing shaft is rotatably arranged in a mounting hole in the output end of a hydraulic rod at the upper end of the fixing frame, and the fixing shaft is fixedly arranged at the upper end of the rotating box; a discharging plate is arranged on one side of the upper portion of the rotating box, a feeding box is arranged at a feeding port in one side of the galvanizing box, a driving assembly used for driving the feeding box to rotate is arranged on one side of the galvanizing box, a moving box is tightly attached to the upper end of the galvanizing box, second guide groove rods are slidably arranged on the two sides of the moving box, and a rotating mechanism is arranged on the inner side of the fixing frame. The first friction wheel and the friction rod are fixedly arranged at the two ends of the fixed shaft, so that bolts in the rotating box are automatically discharged, and the sliding plate is pushed to move through the push plate, so that the bolts fall into the moving box.

The utility model provides an automatic alarm and automatic carbon dioxide fire extinguishing device for a hot-dip galvanizing machine head, and relates to the technical field of hot-dip galvanizing equipment. The automatic alarming and carbon dioxide automatic fire extinguishing device for the hot-dip galvanizing machine head comprises the hot-dip galvanizing machine head, a fire extinguishing mechanism and an automatic control mechanism, the hot-dip galvanizing machine head comprises a machine head sealing cover, a zinc throwing frame tightening device and a zinc throwing frame; the automatic control part comprises a monitoring probe, a control part, a nitrogen cylinder, a gas electromagnetic valve and a release valve; the monitoring probe is installed in the machine head sealing cover and electrically connected with the control piece, and the gas electromagnetic valve is connected with the control piece and the nitrogen cylinder; the control piece is electrically connected with a buzzer alarm and an alarm lamp. According to the automatic alarm and carbon dioxide fire extinguishing device for the hot-dip galvanizing machine head, the technical problems that the interior of a closed machine head of an existing hot-dip galvanizing zinc pot is prone to being on fire, fire is not prone to being extinguished, large economic losses are prone to being caused, and the production recovery time is long are solved.

Method for hot-dip galvanizing a galvanized iron or steel component, wherein the galvanized iron or steel component is subjected to an activation treatment prior to hot-dip galvanizing such that and / or with the stipulation that the galvanized iron or steel component subjected to the activation treatment has an electrical resistance at the surface of the zinc layer of no more than 500 kΩ · cm 2 exhibits, and wherein the galvanized iron or steel component that has undergone activation treatment is subsequently subjected to hot-dip galvanizing, where the electrical resistance at the surface of the zinc layer of the galvanized iron or steel component is determined before the activation treatment, where the activation treatment, depending on the electrical resistance at the surface of the zinc layer of the galvanized iron or steel component, comprises only a flux treatment or a pickling treatment and a flux treatment, where the electrical resistance at the surface of the zinc layer is at most 500 kΩ · cm 2 As an activation treatment, at least a flux treatment is carried out and where the electrical resistance at the surface of the zinc layer is more than 500 kΩ · cm 2 As an activation treatment, at least initially a pickling treatment and subsequently a flux treatment are carried out.

This invention provides an alloyed hot-dip galvanized steel sheet with a tensile strength of 590 MPa or higher, excellent ductility and microcrack resistance, comprising a steel plate and an alloyed hot-dip galvanized layer. The steel sheet has a carbon equivalent (Ceq) of 0.370 or higher and less than 0.520, and a total Nb and Ti content of 0.010 to 0.080% by mass. At one-quarter of the plate thickness, the martensite area fraction is 5 to 30%. From the surface of the steel sheet to a depth of 20 μm, the martensite area fraction is 5 to 30%, the original austenite grain size is 3.0 μm or less (martensite area fraction 50% or higher), and the total Nb and Ti content in precipitates smaller than 100 nm is 50 ppm by mass or more, while the total Nb and Ti content in precipitates larger than 100 nm is 350 ppm by mass or less. Within a range from the surface of the steel plate to a depth of 1 μm, the long sides of the Si and Mn oxides present at the grain boundaries are less than 200 nm.

A hydrogen induced cracking-resistant cold-rolled hot-dip galvanized ultra-high-strength dual-phase steel, comprising a substrate and a galvanized layer plated on the substrate, wherein the substrate contains Fe and inevitable impurity elements, and the substrate further contains the following chemical elements in percentage by mass: 0.1-0.18% of C, 2.2-3.0% of Mn, 0.2-0.6% of Si, 0.03-0.3% of Al, 0.01-0.1% of Nb, 0.01-0.1% of Ti, 0.04-0.2% of Mo, and 0.0005-0.003% of B. The matrixes of the microstructure of the substrate are ferrite and martensite, the microstructure of the substrate further comprises a carbide precipitation phase having a size less than 100 nm, and the carbide particles and the matrixes are in a coherent or semi-coherent state. A manufacturing method for the dual-phase steel comprises the following steps: (1) smelting and casting; (2) hot rolling; (3) acid pickling; (4) cold rolling; (5) hot-dip galvanizing and recrystallization annealing; and (6) cooling after galvanizing.

The invention provides an automatic deslagging iron wire hot-dip galvanizing pot which is characterized in that a zinc pot body is filled with molten zinc, the periphery of an iron wire is immersed in the molten zinc to form a galvanized wire, the galvanized wire is led out from one side of the zinc pot body, an outer blowing ring and a guide plate are mounted in the zinc pot body, and the periphery of the galvanized wire penetrates through the outer blowing ring and then is led out from one side of the zinc pot body; and a guide plate is arranged below the outer blowing ring, and the external compressor can blow compressed gas to the periphery of the galvanized wire through the outer blowing ring. According to the zinc pot, redundant zinc materials on the periphery of a galvanized wire can be blown away and recycled into the zinc pot through compressed air, the compressed air is guided to the position above the position where the galvanized wire is guided out of a galvanizing liquid through the guiding effect of the guiding plate, the liquid level can be blown through the compressed air, and the zinc materials are recycled. The oxide dross is prevented from being attached to the outer surface of the galvanized wire to influence the product quality, the utilization rate of compressed air is improved, the use of electrical components is reduced, and the production and maintenance cost is reduced.

This invention provides a water-based paint composition that exhibits rust-preventive properties on hot-dip galvanized surfaces even in harsh environments such as salt spray tests. [Solution] An aqueous paint composition comprising the following components (A) to (C). (A) Ingredients: (meth)acrylic emulsion (B) Ingredients: Phosphate-based rust inhibitor (C) Component: Particles having silanol groups on their surface

A hot-dip galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dip galvanized layer formed on the surface of the base steel sheet, wherein the difference between the average of the Mn / Si values of surface oxides present on a surface portion, which is the region from the interface between the hot-dip galvanized layer and the base steel sheet to a depth of 15 nm, and the average of the Mn / Si values of internal oxides, which are present in the region from the interface to a depth of 50-100 nm, can be 0.5 or more. Mn and Si of each oxide mean the amounts (wt %) of Mn and Si components in the oxide, which are measured by EDS, and the average of Mn / Si values means the averaged value of the Mn / Si values measured for each oxide.

Provided are: a hot-dip galvanized steel sheet which has a TS of 1700 MPa or more and a YS of 1250 MPa or more, and is excellent in all of the moldability, corona-bond delamination strength, and weld-zone delayed delamination resistance characteristics; and a method for producing the same. A hot-dip galvanized steel sheet according to the present invention is characterized by having a base steel sheet and a hot-dip galvanized layer and is characterized in that: the base steel sheet has a prescribed component composition and a prescribed steel structure; the C content in the surface layer of the base steel sheet is 0.250% or less; the value obtained by dividing the C content in the surface layer of the base steel sheet by the C content of the entirety of the base steel sheet is less than 0.85; an in-steel hydrogen content [H] (mass ppm) of hydrogen, in which a binding energy with a hydrogen trap site of the base steel sheet is 10-100 kJ / mol, is 0.30 mass ppm or less; and when the average Vickers hardness of the surface layer of the base steel sheet is HvS, the following formula (1) is satisfied.　(1): [H]≤(580-HvS) / 320