84 results about "Zinc bath" patented technology

The invention provides a multifunctional plating assistant agent used for hot dip plating, belonging to the technical field of the surface plating technique of steel and iron materials. The technical proposal is as follows: the aqueous solution of the plating assistant agent has the following components of zinc chloride, sodium chloride, potassium chloride, sodium fluoride and a composite surface active agent synthesized by fluorocarbon and hydrocarbon surface active agents with the respective proportion in sequence of 40 to 200g/L, 20 to 50g/L, 20 to 60g/L, 0 to 50g/L, 5 to 30g/L, 0.5 to 5g/L, and the balance of water. The plating assistant agent can improve the plating assistant effect of the plating assistant on the surface of the steel and iron part, prevent the steel and iron part after plating assistance from being oxidized secondarily in air, improve the quality of the surface plating layer of the steel and iron, does not generate zinc burst when in hot dip plating, reduces the dust amount generated by zinc bath surface when in hot dip plating, not only is suitable for hot dip plating, but also is suitable for hot dip aluminium plating.

There are provided a surface coating material for a molten zinc bath member with improved zinc corrosion resistance, a production method thereof, and a molten zinc bath member. The surface coating material comprises WC powder particles and a binder metal. The binder metal comprises Co and a metal element electrochemically nobler than Co and constitutes an alloy structure having a single phase.

The invention discloses an electroless nickel pre-plating and hot post-galvanizing method for controlling the coating thickness of the silicon-containing reactive steel, which means first performing electroless nickel plating and then hot dip galvanizing on a silicon-containing reactive steel part. The electroless nickel pre-plating and hot post-galvanizing method comprises the following processes: (1) doing pretreatment on the surface of the silicon-containing reactive steel part before electroless nickel plating; (2) carry out electroless nickel plating on the surface of the silicon-containing reactive steel part, wherein, the nickel salt used is NiSO4 x 6H2 O, the reducing agent is NaH2PO2 x H2O, and the complexing agent is C6H5Na3O7 x 2H2O; (3) after drying the silicon-containing reactive steel part undergoing electroless nickel plating, conducting hot dip galvanizing on the reactive steel part. The electroless nickel pre-plating and hot post-galvanizing method for controlling the coating thickness of the silicon-containing reactive steel has the advantages of effectively controlling the coating of the hot galvanized silicon-containing reactive steel from thickening exceedingly, thus obtaining a coating with appropriate thickness, smooth surface and good adhesivity, consuming less nickel, and accomplishing the goal of preventing the hot galvanized coating of the silicon-containing reactive steel from excessively thickening by electrolessly plating a nickel coating with a thickness of 3 to 4 microns on the reactive steel part. Moreover, the pre-plate nickel coating can prevent the iron in steel part from dissolving in the zinc bath, thus greatly reducing the formation amount of zinc dross, and reducing the loss of zinc.

The invention relates to an intermediate layer of a sink roller which is used in a hot galvanizing groove; meanwhile, the invention relates to welding wires used in the surfacing of the intermediate layers of coating roller species and a surfacing method thereof. A surfacing welding wire of the intermediate layer of the sink rolled used in the hot galvanizing groove is provided; the components of the welding wire are as follows (mass percent): 0.04 percent to 0.08 percent of C, 0.3 percent to 0.6 percent of Si, 1.0 percent to 1.5 percent of Mn, 10 percent to 12 percent of Cr, 3 percent to 5 percent of Ni, 0.5 percent to 1.2 percent of Mo and the rest is Fe. The surfacing method of the welding wire comprises the following steps: a surfacing area is processed from the roller surface of the sink roller by a machine; the welding wire is matched with an SJ81 welding flux, 300A to 350A of welding current, 28 V to 30V of welding voltage and 400 mm to 600 mm per minute of welding speed for surfacing; and heat treatment anneal is carried out after being heated to 500 DEG C to 540 DEG C. In the invention, the intermediate layer is produced between the austenitic stainless steel substrate and a hot spraying WC-Co coat of the sink roller and a stabling roller, which are working in the hot galvanizing groove, thus improving the combination between the hot spraying WC-Co coat and substrate material.

The invention discloses a method applicable to rolled-steel lot-quantity hot dipping zinc, namely, performing lot-quantity hot dipping zinc to rolled steels in a zinc alloy plating bath formulated by two kinds of binary intermediate alloy. The zinc alloy plating bath comprises the following components: manganese of 0.3%-0.5%, cerium of 0.005%-0.03% and zincium of the rest, and the two kinds of binary intermediate alloy comprise a zincium-manganese binary intermediate alloy comprising manganese of 2%-3% and zincium of the rest; a zincium-cerium binary intermediate alloy comprising cerium of 2%-3% and zincium of the rest.The invention has advantages of simple alloy coating technique, easy controlling of components of alloy zincium bath; effective control of super-thick growth of the coating layer of silicon-contained reactive steel, improvement of corrosion resistance capability of the coating layer, great delaying of the generation of white rust, elimination of disorder inhomogenous color on the coating layer surface of zincium-manganese alloy for obtaining more bright and smooth coating layers; reduced production cost by because of adopting cheap alloy elements; simple technique without changing original hot dipping zinc equipment, which is propitious to scale-production of lot quantity hot dipping zinc of rolled steels.

The invention relates to a method in the field of metal smelting technology, particularly to a circulating cooling deslagging method in continuous hot dip of zinc-aluminium alloys. The method is characterized by placing a circulating cooling deslagging apparatus in zinc-aluminium liquid in a galvanized zinc pot, wherein the apparatus has an internal temperature lower than the temperature of the zinc-aluminium liquid in the galvanized zinc pot and is provided with a circuitous groove inside and a zinc dross collector at the bottom, with the circuitous groove being open-ended at two ends, provided with a zinc-aluminium liquid driving device at an inlet and embedded with a honeycomb-shaped cooling pipe equipped with an inlet and an outlet; driving the zinc-aluminium liquid to enter the circuitous groove from the inlet of the circuitous groove, pressing molten metal liquid with low temperature and low melting point in the honeycomb-shaped cooling pipe to cool the zinc-aluminium liquid in the circuitous groove when the zinc-aluminium liquid flows through the circuitous groove, reducing the temperature of the zinc-aluminium liquid for the precipitation and growth of the zinc dross from the zinc-aluminium and deposition of the zinc dross in the zinc dross collector at the bottom, and completing the deslagging and purifying of the zinc-aluminium liquid after the zinc-aluminium liquid, from which the zinc dross is precipitated, flows back to the galvanized zinc pot through the outlet of the circuitous groove. The method in the invention can effectively remove the zinc dross in a zinc bath.

The invention relates to a method for the production and removal of a temporary protective layer for a cathodic coating, particularly for the production of a hardened steel component with an easily paintable surface, wherein a steel sheet made of a hardenable steel alloy is subjected to a preoxidation, wherein said preoxidation forms a FeO layer with a thickness of 100 nm to 1,000 nm and subsequently a melt dip coating is conducted, wherein, during the melt dip coating, a zinc layer is applied having a thickness of 5 to 20 μm, preferably 7 to 14 μm, on each side, wherein the melt dip process and the aluminum content of the zinc bath is adjusted such that, during the melt dip coating, an aluminum content for the barrier layer results of 0.15 g/m² to 0.8 g/m² and the steel sheet or sheet components made therefrom is subsequently heated to a temperature above the austenitizing temperature and is then cooled at a speed greater than the critical hardening speed in order to cause hardening, wherein oxygen-affine elements are contained in the zinc bath for the melt dip coating in a concentration of 0.10 wt.-% to 15 wt.-% that, during the austenitizing on the surface of the cathodic protective layer, form a thin skin comprised of the oxide of the oxygen-affine elements and said oxide layer is blasted after hardening by irradiation of the sheet component with dry ice particles.

The present invention relates to zinc alloy for hot dip galvanizing steel member and its ingot form and hot dip galvanizing process. The zinc alloy consists of Al 0.008-0.012 wt%, Ni 0.02-0.04 wt%, and Zn and inevitable impurities for the rest. The zinc alloy is shaped in cuboid with ears and hoisting holes for easy hoisting, storing and transporting. When it is applied in hot dip galvanizing steel member, the zinc alloy is melted directly to form one zinc bath for convenient use and lowered galvanizing cost.

The invention discloses a method of constructing a highly corrosion-resistant zinc alloy double-coating on the surface of a steel product. The method comprises the technological steps of degreasing, water washing, pickling, water washing, assisted plating, drying, hot dipping in pure zinc, cooling, hot dipping in a highly corrosion-resistant zinc alloy, and cooling sequentially. The highly corrosion-resistant zinc alloy is an alloy with a relatively low melting point and high coating corrosion resistance for the hot dipping. The surface of the steel product is subjected to pre-treatment of plating by adopting a conventional batch hot-dip galvanizing process, and after being subjected to hot-dip galvanizing in a 435-460 DEG C pure zinc bath, the surface of the steel product is directly placed in or is cooled and then placed in a 385-450 DEG C alloy bath for dip plating for 5-120 s, and then is cooled. By adopting the method, the problems that the probability of skip plating is high, a coating is thin (less than 20 m) and the surface quality of the coating is poor when steel is directly put in a dip plating aluminum-zinc (the content of Al is greater than 1%) alloy bath are solved, the corrosion resistance of the steel product is improved significantly and the service life is prolonged substantially due to a constructed double-coating superimposed structure, the method is stablein technology, and the coating quality is easy to control.

The invention discloses a method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel, which performs batch hot dip galvanizing on the rolled steel in a zinc alloy plating bath prepared from two binary intermediate alloys. The zinc alloy plating bath comprises the following components by weight percentage: 0.03 to 0.05 percent of nickel, 0.03 to 0.08 percent of vanadium, and the balance of zinc. The two binary intermediate alloys comprise the following components by weight percentage: 2 to 3 percent of the nickel in a zinc-nickel binary intermediate alloy, and the balance of zinc; and 1 to 2 percent of vanadium in a zinc-vanadium binary intermediate alloy, and the balance of the zinc. The alloy plating coat has a simple process, the components of the alloy zinc plating bath are easy to control, adverse effects on the plating coat caused by silicon in the steel for the hot dip galvanizing can be overcome effectively, the thickness of the plating coat is reduced effectively, and simultaneously, the corrosion resistance and the antioxygenic property of the plating coat is further improved and the prior hot dip galvanizing equipment is not necessary to be changed, thus the method is advantageous for the large-scale production of the batch hot dip galvanizing of the rolled steel.

The invention discloses a device for collecting zinc smoke of a hot-dip galvanizing workshop and relates to a smoke collecting device. The device comprises a dust collecting cover body fixed on a travelling crane; two load lifting hooks of a crane are hooked by virtue of a vertical guide rope which passes through a cover body rack from top to bottom; the cover body can be used for moving and fetching workpieces with the crane; the fixed device part is supported and guided by upright stands which are distributed on four corners of a zinc pot; for movable baffle plates at the two sides in the length direction of the zinc pot, when the workpieces are soaked in zinc bath, the movable baffle plate at the outer side ascends, so that the top of the movable baffle plate at the outer side is in butt joint with the lower end of the cover body, and the bottom of the movable baffle plate at the outer side is aligned to the top of the movable baffle plate at the inner side, so that the space above the workpieces and the zinc pot is sealed, and thus, the smoke dust is prevented from escaping; meanwhile, the zinc ash on the surface of the zinc bath is prevented from being taken away, so that the zinc consumption is saved; when the zinc ash is scrabbled, the movable baffle plate at the inner side ascends, so that space is made for convenience in operation; when the workpieces are fetched, the movable plates are descended for convenience in conveying the workpieces.

The invention provides a multi-purpose ammonium-free fluxing agent for hot dip coating and an application method thereof. The multi-purpose ammonium-free fluxing agent is suitable for hot dip coating of zinc-aluminum alloys with various aluminum contents, and is good in fluxing effect, small in soot content during hot dip coating and capable of perfecting the production environment. According to the technical scheme of the invention, the matching components of per liter of fluxing solution comprise 240-300 g of ZnCl2, 10-24 g of NaCl, 5-12 g of CaCl2, 20-60 g of SnCl2, 16-60 g of K2ZrF6 and the balance of water. Before the fluxing solution is used, a workpiece is subjected to alkali washing in a 10-25% NaOH solution at 60-80 DEG C for deoiling, is pickled in 20-40% HCL solution at normal temperature for derusting after being washed with water and is washed with water again, then the workpiece is soaked in the ammonium-free fluxing agent for fluxing treatment, the temperature of the fluxing solution is controlled within 40-80 DEG C, and finally, the workpiece is dried in a drying box of 90-120 DEG C after the fluxing treatment. The characteristics of the fluxing solution are as follows: the components of the fluxing agent generate no mutual reaction, corrosion on a matrix is small, oxides on the surface of a molten pool can be cleaned to effectively protect the matrix, decomposition products do not enter zinc bath, and the cost is low.

The invention relates to a device (1) for inserting metal ingots (2) into a metal bath (3), in particular zinc ingots into a zinc bath, wherein the device (1) comprises feed means (4) with which an ingot (2) can be fed to the metal bath (3), and wherein the device (1) comprises heating means (5) with which the ingot (2) can be heated to a desired temperature before and/or after its feeding into the metal bath (3). In order to improve the process control, it is provided according to the invention that the heating means (5) comprise at least one independently operated heating element which can be operated independently of other system parts with which the device (1) cooperates.

The invention provides a production method of a zinc-aluminum-manganese-magnesium alloy for hot dipping. The zinc-aluminum-manganese-magnesium alloy for hot dipping is produced through a preparation process of a zinc-aluminum-manganese-magnesium alloy and a dosing proportion control process of the zinc-aluminum-manganese-magnesium alloy. Compared with the traditional zinc alloy for hot dipping, the zinc-aluminum-manganese-magnesium alloy for hot dipping, provided by the invention, has the advantages that the corrosion resistance and adhesion of a coating are improved, and the manufacturing cost of the alloy is reduced. Meanwhile, due to the addition of the aluminum element, the zinc bath surface oxidation can be reduced, and the coating is thinned and brightened and has good adhesion; due to the addition of the magnesium element, the melting point of the alloy is reduced; due to the addition of the manganese element, the generation of zinc pot bottom slag is reduced, and the zinc-aluminum-manganese-magnesium alloy better conforms to the requirements for energy conservation and environmental protection and can be widely applied to the fields such as modern buildings, decoration, traffic, home appliance and the like. The production method is suitable to be used as a method for producing a zinc-aluminum-manganese-magnesium alloy for hot dipping.

The invention relates the hot galvanizing, especially the zinc pan slag removal device. The device comprises drafting slag part, vacuum case and vacuum pump. The drafting slag part comprises drafting slag pipe, express connector, slag-off pipe and cut-off valve. One end of slag-off pipe is connected with vacuum case, the other end of it is connected with drafting slag pipe through express connector, and drafting slag pipe extends in the bottom of zinc pan. The vacuum case comprises body and airtight cover, on the airtight cover there are three pore paths, one of which is connected with slag-off pipe, the second of which is connected with aspirator, the third of which is connected with vacuum pump, and the vacuum case body is connected with airtight cover by screw. The invention has the advantages of simple structure and installation, easy operation, high cleaning efficiency and low cost.

The invention provides a galvanized bath for a steel band galvanizing production line. The galvanized bath comprises a zinc bath, water, a zinc block, an anode strip, a cathode strip, an anode pole and a cathode pole, wherein the zinc bath is an elongated pool made of cement; the anode strip and the cathode strip are arranged along the long outer side wall of the zinc bath in parallel; the anode strip and the cathode strip are insulated from the wall of the pool; the anode pole is supported on the anode strip and is bridged over the zinc bath; the zinc block is connected with the anode pole and then is soaked into water in the zinc bath; and the cathode pole is supported on the cathode strip and is bridged over the middle part of the zinc bath. By adoption of the galvanized bath, steel band products which are very long can be subjected to cold galvanization uninterruptedly with low cost, high efficiency and high quality.

The invention relates to a zinc alloy for steel component galvanizing, the ingot shape and the method. The comprised component and weight proportion are as follows: 0.008%-0.012%(wt)Al,0.006%-0.01%(wt)RE, the rest is zinc and unavoidable impurities. The ingot shape is'T'cuboid with two symmetrical ear-warps, the bottom of cuboid is plane, ear-warps are equipped with hoisting holes, and the four sides are inclined plane which is narrow-end-up shape. It is characterized by direct fusion of said alloy to zinc bath, simple utilization, stable and homogeneous Al and rare earth content in zinc alloy, improved coating brightness and zinc flowability, decreased coating thickness, and saved zinc plating cost. The proper zinc alloy ingot shape and weight meets the demand of zinc addition for large-capacity galvanizing equipment, and it is convenient for hoisting and cross transportation, specific surface area is small, which is suitable for multi-layer stacking storage.

This invention relates to a hot-galvanized Al-Pb-Sb alloy, its hot-dip galvanization method and its ingot for narrow steel belt. The hot-galvanized Al-Pb-Sb alloy comprises: Al 0.4-1.0 wt.%, Pb 0.003-0.1 wt.%, Sb 0.1-0.25 wt.%, and Zn and impurities as balance. The T-shaped ingot of the hot-galvanized Al-Pb-Sb alloy is a trapezoid with two symmetric warped ears. The ears have lift-off holes. The hot-galvanized Al-Pb-Sb alloy is directly smelted into a zinc bath. The hot-galvanized Al-Pb-Sb alloy can improve the fluidity of the zinc bath, decrease the residue rate, and increase the smoothness of the galvanization layer. The hot-galvanized Al-Pb-Sb alloy is used for galvanizing on a narrow steel belt.

The invention relates to a zinc alloy for steel component galvanizing, the ingot shape and the method. The comprised component and weight proportion are as follows: 0.008%-0.012%(wt)Al,0.02%-0.08%(wt)Bi, 0.006%-0.01%(wt)RE, the rest is zinc and unavoidable impurities. The ingot shape is'T'cuboid with two symmetrical ear-warps, the bottom of cuboid is plane, ear-warps are equipped with hoisting holes, and the four sides are inclined plane which is narrow-end-up shape. It is characterized by direct fusion of said alloy to zinc bath, simple utilization, stable and homogeneous aluminium, bismuth and rare earth content in zinc alloy, improved coating brightness and zinc flowability, decreased coating thickness, and saved zinc plating cost. The proper zinc alloy ingot shape and weight meets the demand of zinc addition for large-capacity galvanizing equipment, and it is convenient for hoisting and cross transportation, specific surface area is small, which is suitable for multi-layer stacking storage.

The invention discloses a method for hot dipping of a composite zinc coating on the surface of steel and a steel coating composite material, and relates to the field of corrosion protection. The method for hot dipping of the composite zinc coating on the surface of the steel comprises the steps that primary dip plating is carried out on the steel in a zinc bath, and then secondary dip plating is carried out in an alloy bath with a melting point lower than the melting point of pure zinc; and the alloy bath contains zinc and aluminum elements, and a mixed melting point of the alloy bath is lowerthan the melting point of the pure zinc. According to the method for hot dipping of the composite zinc coating on the surface of the steel and the steel coating composite material, primary dip plating is creatively carried out in the zinc bath and then secondary dip plating is carried out in the alloy bath with the melting point lower than the melting point of the pure zinc, the secondary dip plating is equivalent to replacement of other elements except zinc in the alloy bath to form a pure zinc plating layer, a plating layer material with larger thickness and high corrosion resistance can beobtained, and the method is suitable for batch hot dipping of steel surfaces.

The invention relates to zinc-aluminum-magnesium intermediate alloy capable of supplementing the lost magnesium element in a zinc-6Al-3Mg alloy liquid bath and a method thereof. According to the technical scheme, the zinc-aluminum-magnesium intermediate alloy comprises, by weight, 6wt.% of Al, 4.0-8.0 wt.% of Mg and the balance Zn. The method for supplementing the lost magnesium element in the zinc-6Al-3Mg alloy liquid bath comprises the steps that, granular Zn-6wt.Al-(4.0-8.0)wt.%Mg intermediate alloy accounting for 1.0-2.0wt.% of zinc alloy liquid is added into a zinc-6Al-3Mg alloy molten bath, and the magnesium element in the zinc-6Al-3Mg alloy bath is continuously supplemented. According to the zinc-aluminum-magnesium intermediate alloy and a method thereof, the effect of stabilizing the magnesium content of the zinc-aluminum-magnesium galvanization alloy molten bath is achieved, and the magnesium element supplementing method is simple and reliable.

The invention relates to an on-line automatic pretreatment process for steel pipe hot-dip galvanizing. The process includes following steps performed on line in order: degreasing, rinsing, washing with an acid to remove rust, rinsing, performing plating assistant treatment and drying. The step of degreasing and the step of washing with the acid to remove the rust are performed at a condition lower than 40 DEG C, thus reducing energy consumption and significantly reducing discharge of acid mist and alkali mist. By adoption of the process, under the conditions of not adding a rare earth plating assistant and not adding rare earth into a zinc bath, hot-dip galvanizing of zinc-aluminum alloys can be achieved, the plating thickness of the zinc-aluminum alloy is uniform, and defects such as skip plating are avoided.