336results about How to "Improve anti-corrosion" patented technology

A coating solution comprising 0.1 to 35% by weight of an inorganic or organic polysilazane having repeating units represented by the general formula below and soluble in a solvent and 0.1 to 10% by weight of catalyst such as 4,4′-trimethylenebis(1-methylpiperidine) based on a pure polysilazane content. By applying the coating solution onto the surface of base materials such as metals, plastics, glass, ceramic, wood, cement, mortar, bricks, etc., a silica coating strongly adhered to the base materials can be formed excellent in corrosion resistance and anti-scratch properties and simultaneously excellent in characteristics such as abrasion resistant, long-lasting anti-fouling properties, wetting properties to water, sealing properties, chemical resistance, oxidation resistance, physical barrier effect, heat resistance, fire resistance and antistatic properties.

The invention discloses a recycled concrete and a production technology thereof. The recycled concrete is prepared from, by weight, 100-112 parts of coarse aggregates, 68-75 parts of fine aggregates,27-33 parts of cement, 15-22 parts of a mineral admixture, 5-10 parts of fibers, 3-8 parts of rubber particles, 13-19 parts of water and 0.6-1.0 part of an admixture; the coarse aggregates include modified recycled coarse aggregates and ordinary coarse aggregates, and the recycled coarse aggregates are obtained by modifying waste concrete particles with a nano-material and silica sol as modifiers;and the fine aggregates include recycled fine aggregates and ordinary fine aggregates. The production technology improves the compressive strength, the flexural strength and the drying shrinkage of concrete, and improves the flexural property, the impermeability, the corrosion resistance, the impact resistance and the wear resistance of concrete. The preparation method of the recycled concrete includes the following steps: detection, metering, mixing, stirring and curing. The preparation method of the invention has the advantages of simple production process, safety in operation, and easinessin implementation.

The invention relates to a high temperature and wear resistant graphene coating, and the graphene coating is characterized by comprising the following components by weight percent: 35.0-60.0wt% of silicate, 0.01-20.0wt% of graphene, 0.1-25.0wt% of additive, and the balance of water as a solvent. The invention further provides a method for preparing the coating. The high temperature and wear resistant graphene coating disclosed by the invention can be used for well protecting matrixes by coating on pipelines, chemical equipment, storage, kiln furnace, medicine, aerospace and sewage, the service life of the matrix is prolonged, and the performance of the coating is much greater than that of a common material.

The present invention discloses a magnesium alloy chrome-free dyclo solution coating and its production method. It is characterized by that the organic silicon and nano powder body undergone the process of nano dispersing liquor treatment are dispersed in the resin made up by using several resins through the process of polymerization and cross-linking reaction to make modification, and mixed with zinc powder and aluminium powder so as to obtain the invented acid-resistant, alkali-resistant, salt fog resistant, impact-resistant and corrosion-resistant magnesium alloy chrome-free dyclo solution coating.

The invention relates to a regeneration technology of waste engine oil, in particular to a regeneration method of the waste engine oil. The regeneration method is used for solving the problem that the prior art has no regeneration method of the waste engine oil. The method is realized by adopting the following steps: (1) the filtration of the waste engine oil is carried out; (2) sodium hydroxide solution and hydrogen peroxide are added, the heating is further carried out till 80 to 90 DEG C, the still placement is carried out for 8 to 12 hours, the upper layer of clarified liquid and the lower layer of sediment are separated; (3) the upper layer of the clarified liquid is injected into a distillation kettle for carrying out the atmospheric distillation to obtain a diesel oil component; (4) when the temperature of the upper layer of the clarified liquid reaches 280 to 310 DEG C, the atmospheric distillation is stopped, the vacuum distillation is started to obtain vacuum distillation products, attapulgite with 3 to 8 percent of the weight of the vacuum distillation products is added therein; (5) benzotriazole fatty acid amine with 3 to 8 per mill of the weight of the engine oil component is further added for stirring, thereby obtaining regenerated engine oil product. The regeneration method of the waste engine oil has no pollution, high conversion rate and low regeneration cost, and all the indicators of the obtained regenerated engine oil can achieve the using standards. The method can be used for the regeneration of the waste engine oil with various sources.

The invention relates to a method for processing a composite pipeline of a ceramic macromolecular lining and the composite pipeline thereof. In the method, a metal tube is used as a support material, and a wear-resistant corrosion-resistant high polymer material and a ceramic plate are used as a lining layer; the ceramic plate is adhered to the surface of the high polymer material by using an adhesive and is prepared into a hose; the outer surface of the hose is coated with the adhesive, the hose is connected to the metal tube, one end of the hose is sealed and high pressure gas is introduced from the other end of the hose, so that the hose is adhered to the metal tube under the action of pressure and the hose made of the ceramic and the high polymer material is supported and adhered to the inner wall of the metal tube by using the adhesive. The method overcomes the defects that complex pipelines such as pipelines with small inner diameter, bent pipelines and the like cannot be constructed; the composite pipeline has high strength, wear resistance and corrosion resistance by combining the metal, the high polymer material and the ceramic, can replace the metal pipeline, has long service life, and can be widely applied to deslagging and exhausting pipeline systems in the industries of metallurgy, mine, electric utility, chemicals and the like.

A corrosion-resisting sea water pump comprises a pump body and an impeller installed inside the pump body, wherein the impeller comprises an iron-base alloy impeller body and an chromic oxide ceramic material layer outside the impeller body. The pump body comprises an aluminum alloy pump body, a silicon oxide ceramic material layer on the outer surface of the pump body and a titanium carbide ceramic material layer on the inner surface of the pump body. The corrosion-resisting sea water pump has the advantages that iron alloy and the aluminum alloy contain simple components and can meet the strength requirement of an oil pump; the iron alloy and the aluminum alloy containing the simple components are subjected to surface treatment processes of acid pickling and passivation, so that any surface black points and other problems are avoided, and a clean and tidy surface can be obtained.

The invention relates to a self-repairing water-based epoxy compound elastic coating material and a preparation method of the material and belongs to the technical field of paint. The method comprisesthe steps of dispersing macroporous adsorbent resin adsorbing a saturated HMDI (hexamethylene diisocyanate) prepolymer, a latent curing agent and a catalyst mixture and a high water absorber in a paraffin molten mass to prepare macroporous adsorbent resin-water absorber microcapsules, dispersing the microcapsules in water to form microcapsule dispersing liquid, and mixing and curing the microcapsule dispersing liquid, water-based epoxy resin, a water-based epoxy curing agent and the like for film formation to form the water-based epoxy compound elastic coating material with a self-repairing function. When a coating layer is scratched, or a base material deforms and generates a crack, the high water absorber in the microcapsules can adsorb moisture in the air to expand; and the HMDI prepolymer and the latent curing agent can quickly react with groups, such as alkylol amine, generated by the moisture or the water to generate a polyurethane-urea cured substance for synergic repair of thecrack. The material can be used for the highway fields of tunnels, bridges, concrete fender walls, metal guardrails and the like and has effects of corrosion resistance, water resistance, attractiveness, visual fatigue reduction and the like.

The invention provides a magnesium oxychloride and magnesium oxysulfate compound cement foam fire door core board and a preparation method thereof. The core board comprises the following raw materials: magnesium oxide, an anhydrous magnesium chloride solution, a magnesium sulfate solution, desulfurization gypsum, superfine carbon fiber, superfine micro-silica, a cationic polyacrylamide solution, ferrous sulfate and an efficient foaming agent, between which the ratio is 100:60:66.6:2:0.8:0.5:0.5:0.5:0.5. The method comprises the following steps: uniformly mixing the anhydrous magnesium chloride solution and the magnesium sulfate solution, adding the anhydrous magnesium chloride solution and the magnesium sulfate solution into a stirring machine, adding the cationic polyacrylamide solution and a ferrous sulfate solution into the stirring machine, and adding superfine carbon fiber, lightly calcined magnesium oxide, desulfurization gypsum, superfine microsilica and a foaming solution in sequence while performing stirring; pushing a stack of moulds, in which foaming slurry is poured, into a curing stove, curing the moulds for 8-10h, and then performing demoulding; and after demoulding, performing moisture preservation and temperature control curing and water control curing respectively until the moisture content is less than or equal to 10%. The core board provided by the invention is environmentally friendly and light, has high-strength and favorable high temperature resistance and meets the national requirements for fire prevention and safety.

An injector may include an injector valve needle which is coated with a diamond-like carbon (DLC), and a valve seat that is selectively contacted with the injector valve needle and is coated with a modula tungsten carbide carbon (modula WCC).

The invention solves the defects of the prior art, and provides a preparation method of high-impermeability concrete which has the advantages of full utilization of wastes, low manufacturing cost, energy conservation, environmental protection, water resistance, long service life, high strength, crack resistance, high impermeability and the like. A concrete part is composed of the following raw materials (wherein concrete has a main strength grade of C20-C60 and an anti-permeability grade of P6 or above): based on the weight of the concrete per cubic meter, 230-550 kg of the cement, 900-1300 kgof gravel, 500 to 600 kg of tailing sand, 300-400 kg of machine-made sand, 30-100 kg of fly ash, 30-100 kg of mineral powder, 5%-15% of silica fume (the percentage of the content of cement gum and anoptimal mixing amount of about 10%), 6.6-17.3 kg of a water reducing agent containing an air entraining agent or a single-use high-efficiency water reducing agent polycarboxylic acid, 8%-12% of an expanding agent, 5%-12% of an anti-permeability agent (different mixing amounts for different products), 0.6-1.8 kg (generally 0.8-0.9 kg) of polymer fibers (generally polypropylene PP, modified polypropylene or a mixture of several kinds of fibers) and 140-180 kg of water.

The invention discloses graphene radiating material and a preparation method thereof. The graphene radiating material comprises agent A and agent B mixed well at a mass ratio of 1:1, the agent A comprises the following components, by weight: 40-60% of fluorocarbon resin, 30-50% of a mixed solvent, 5-15% of graphene, 0.5-1.5% of a leveling agent, and a 0.5-1.5% of a dispersant; the agent B comprises a mixed solvent and a curing agent at a mass ratio of 10:1. The prepared coating has the advantages such as high thermal conductivity coefficient, high thermal radiation coefficient, god radiating effect, acid and alkali tolerance, salt spray tolerance, impact resistance and high matrix adhesion, and the radiating material is widely applicable and usable.

The invention relates to a polysiloxane, glycidol and quaternary ammonium salt-containing multifunctional gelatin leather finishing agent and a preparation method. The preparation method comprises the following steps: dissolving gelatin in water to prepare aqueous solution with mass concentration of 2-20 percent; adding epoxy quaternary ammonium salt into a first reaction flask under the conditions of temperature of 40-70 DEG C and pH of 6-12 to obtain solution 1; adding glycidol into a second reaction flask to obtain solution 2; adding a surfactant into a third reaction flask, and meanwhile adding Si-O-Si repetitive unit-containing epoxypolysiloxane in batches or continuously to obtain solution 3; mixing the solution 1, the solution 2 and the solution 3 in different proportions, weighing 15-20 g of the mixed solution to be placed in a mold of polytetrafluoroethylene, adding 5-10 mL of one or three or four of ethanol, tetrahydrofuran, acetone and methanol and drying in a normal pressure drying oven at the temperature of 40-80 DEG C to obtain the multifunctional gelatin leather finishing agent. The finishing agent has the characteristics of strong hydrophobicity, flexible film, antibacterial property, high heat stability, organic solvent resistance, wet scrubbing resistance and the like.

The invention discloses high-performance anti-freezing concrete and a preparation method thereof, and relates to the technical field of concrete preparation and production. The high-performance anti-freezing concrete comprises the following components by weight: 1200-1500 parts of aggregate, 150-180 parts of cement, 50-80 parts of mineral powder, 7-12 parts of a superplasticizer, 2-5 parts of an air entraining agent, 4-6 parts of an antifreeze agent, and 140-160 parts of water, wherein the aggregate comprises stones, medium sand and fine sand in a mass ratio of (4-5): (2-3): 1. The preparationmethod of the high-performance anti-freezing concrete comprises the following steps: S1, pre-dispersing an aggregate; S2, dispersing powder; S3, dispersing an aqueous solution; and S4, dispersing fibers. The anti-freezing concrete has the technical effects that the anti-freezing performance of concrete can be stably improved and the comprehensive performance is excellent.

The invention discloses a protection method for an outdoor willow furniture product. The protection method comprises the following steps: (1) preparation of a protection paint; (2) pretreatment of a willow product; (3) protection treatment. The protection paint in the protection method has an excellent use characteristic, the adsorbability of the protection paint and the willow product is further improved through a reasonable spraying method, and the protection paint on the surface of the willow product does not fall off or degrade even under the weather with bad environmental change. According to the outdoor willow furniture product treated by the method, the characteristics of inflaming retarding, smoke inhibition, corrosion prevention, mould prevention, insect prevention, antisepsis and loss resistance are well strengthened, the surface of the outdoor willow furniture product is smooth and has no wrinkle, the bending strength is improved by 20-30%, the compressive strength is improved by 15-20%, and the protection method has a high use value.

The invention relates to the technical field of wood modification, in particular to a modification technology capable of improving strength and tenacity of wood. The modification technology comprises the following steps: A. preparation of impregnation liquid which is prepared from the following raw materials in parts by weight: 10-30 parts of melamine modified urea resin, 6-10 parts of dextrin, 1-5 parts of a nanometer modifying agent, 1-3 parts of a flexibilizer, 1-5 parts of auxiliaries and 60-100 parts of water, weighing the raw materials according to the weight proportion and uniformly mixing to obtain the impregnation liquid; B. impregnating: performing vacuum-pressure impregnation treatment on the wood, and enabling the wood to adsorb the impregnation liquid; C. drying: drying the impregnated wood; D. thermal treatment: conducting thermal treatment on the dried wood under a vacuum state. The modification technology disclosed by the invention can obviously improve the strength and the tenacity of the wood, is simple in steps, convenient to operate and control, stable in quality, high in production efficiency and capable of realizing large-scale industrial production.

Provided herein is an electric Al—Zr—Mn alloy-plating bath which comprises (A) an aluminum halide; (B) one or at least two kinds of compounds selected from the group consisting of N-alkylpyridinium halides, N-alkylimidazolium halides, N,N′-dialkyl-imidazolium halides, N-alkyl-pyrazolium halides, N,N′-dialkyl-pyrazolium halides, N-alkylpyrrolidinium halides and N,N-dialkyl-pyrrolidinium halides; (C) a zirconium halide; and (D) a manganese halide, in which the molar ratio of the aluminum halide (A) to the compound (B) ranges from 1:1 to 3:1. The plating bath never involves any risk of causing an explosion and can provide a smooth and fine Al—Zr—Mn alloy-plated film. Moreover, the resulting film has high resistance to corrosion even when it does not contain any chromium and therefore, it is quite suitable from the viewpoint of the environmental protection and it can thus be used in a wide variety of applications including the plating of parts for motorcars, and the plating of parts for electrical appliances.

The present invention relates to a water-based pore sealing agent enhancing PCB coating anti-oxidation and anti-corrosion properties, consisting of, by weight, 4-12 parts of a corrosion inhibitor, 15-25 parts of a mixed surfactants system, 10-20 parts of an ion chelating agent, 6-15 parts of a pH regulator, 20-40 parts of a builder, and the rest being purified water. When used to perform pore sealing on a PCB, the water-based pore sealing agent is diluted with purified water first to be diluted 10-100 times, preferably, 100 / 8-100 / 3 times. The pH value is 7-11, and is preferably 7.5-9.5. The surface tension is 18-28 dyn / cm. The pore sealing treatment uses a immersion process, and preferably ultrasonic waves are added at the same time to assist in cleaning the pores. For the pore sealing treatment, the temperature is 20-60° C., and the time is 60-150 seconds. After pore sealing, the temperature for drying the coated piece is 80-150° C., and the time is 60-120 seconds. The PCB treated with the water-based pore sealing agent of the present invention undergoes the neutral salt spray test, the nitric acid vapor test, the mixed gas test, and the sulfur dioxide and bonding tensile strength test, and the results have indicated that the anti-oxidation and anti-corrosion properties of the coating thereof are significantly enhanced.

The invention discloses an auxiliary treatment device for abdominal pain in digestive department, comprising a bottom support part, an elevation adjustment part and an abdominal massage part, whereinthe abdominal massage part is installed on the upper part of the bottom support part through the elevation adjustment part. The air condition is convenient to move, easy to use, reasonable design, structural stability, not easily damaged, Long service life, Protective coatings produced, which can effectively increase the corrosion resistance of the disc and the waist circular groove, Abrasion resistance, aging resistance, can cooperate with the different height sickbed to carry on the massage treatment to the patient, the applicability is good, safe and reliable, the invention can effectivelyavoid the potential safety hazard of abdominal massage part crushed patients caused by misoperation of electric adjustment, It can effectively avoid the accident in the treatment of abdominal pain, massage treatment effect is good, can effectively alleviate the pain of patients with abdominal, can effectively avoid the rotation of silica gel block caused by patients with abdominal skin injury, itis worth promoting and popularizing.

The present invention adopts the technological steps of degreasing, removing rust, surface activating, cathode plating and multifunctional plating or degreasing, removing rust, spray-coating inner wall, spray-coating outer wall, drying and solidifying paint film so as to obtain the invented pumping rod, oil pipe and sleeve with several protective layers. Besides, said invention also adopts the processes of plating inner layer and painting outer layer or plating inner layer and outer layer or coating inner layer and outer layer, also can add anti-scaling layer, paraffin-inhibiting layer, corrosion-inhibiting layer or other functional layer.

The surface of an aluminum alloy high-temperature processed article containing Mg is heated at a high temperature of 200° C. or above, thereafter the surface is etched with an aqueous solution containing a chelating agent, and then at least one surface treatment selected from hydration oxidation treatment, coating type chromating, coating, anodizing, and alternating current electrolysis in an aqueous alkali solution is further carried out.This method can provide a surface-treated aluminum alloy high-temperature processed article having superior anticorrosion and adhesion of coatings and a good surface appearance, and is effective as a pretreatment for further surface treatment.

The invention discloses acidic organic fertilizer special for blueberries. The acidic organic fertilizer special for the blueberries is prepared from, by weight, 80-120 parts of crop straw, 60-80 parts of animal waste, 10-20 parts of pond sludge, 5-15 parts of urea, 2-8 parts of humic acid, 3-9 parts of expansion sand, 1-5 parts of talcum powder, 2-5 parts of cottonseed meal, 3-5 parts of citric acid, 1-5 parts of EM bactericides, 2-4 parts of zinc sulfate, 1-3 parts of monoammonium phosphate, 2-4 parts of potassium chloride, 3-5 parts of manganese sulfate, 2-4 parts of barium sulfate and 4-8 parts of soil acidity conditioners. The invention further provides a preparation method of the acidic organic fertilizer special for the blueberries. According to the acidic organic fertilizer special for the blueberries, the acidity of a planting field of the blueberries can be kept, an acidic planting environment is supplied to growth of the blueberries, and the survival rate and yield of the blueberries are effectively improved.

The invention discloses an automobile interior trim material capable of removing formaldehyde. The automobile interior trim material is prepared from, by weight, 30-35 parts of bamboo fiber, 2-3 parts of antimonous oxide, 5-7 parts of shell powder, 10-12 parts of waterborne polyurethane, 0.2-0.4 part of a silane coupling agent kh570, 1-2 parts of polyethylene wax, 10-13 parts of polyvinyl alcohol, 100-105 parts of polylactic acid, 60-68 parts of dimethylacetamide, 30-35 parts of dimethyl sulfoxide, 9.6-10.7 parts of carbonized scindapsus aureus, 9.5-10.5 parts of microlite powder, 6-7 parts of poly(butylene succinate), 10-12 parts of acrylic emulsion and an appropriate amount of deionized water. According to the automobile interior trim material, operation is easy, the raw material sources are wide, the biodegradability is good, toxic substances such as formaldehyde in an automobile can be removed, air can be purified, and a healthy and comfortable environment can be built.

The invention relates to anti-oxidant and wear-resistant surface protection grease for steel wire ropes. The surface protection grease consists of the following components in percentage by weight: 12-16 percent of palm wax, 17-20 percent of Duroc slack wax, 17-21 percent of naphthenic base extract oil, 22-26 percent of paraffin base high-viscosity oil, 2-5 percent of zinc dialkyl dithiophosphate, 1-4 percent of diphenylamine, 6-10 percent of polyisobutene, 7-11 percent of ethylene-propylene copolymer and 0.1-1 percent of calcium sulfonate. Compared with the prior art, the surface protection grease has the advantages of high dropping point, no softening or drain on hot weather, quick coagulation during coating, no waste of raw materials, no pollution on the operation environment (including use), high moving viscosity, high adhesion to the surfaces of steel ropes, and avoidance of the phenomenon of falling in a strong shocking state at a high temperature during operation. The more outstanding characteristic is that the neutral and weakly acid states of the conventional final products (including imported Elaskon) are turned into a weakly alkaline (NaOH is not more than 0.15 percent) state in which metals can pass a corrosion test. As the formation of acid substances can be neutralized effectively, SH / T0325 oxidation stability test and SH / T0332 corrosion test are passed excellently, the service lives of steel wire ropes are prolonged, and the production, storage and use environments are purified.

The invention belongs to the technical field of paints, and relates to a polyvinyl alcohol fiber-fluorine polyurethane anti-cavitation paint and a preparation method thereof. The film forming material of the paint is fluorine-containing polyurethane, and has the advantages of high adhesive force, high toughness, weather resistance, chemical mediator resistance, temperature resistance, low surface energy, low friction property and the like. By adding the high-strength high-modulus polyvinyl alcohol fiber as the filler, the paint has the advantages of very high tensile strength and modulus, acid / alkali resistance, aging resistance, corrosion resistance, weather resistance and the like; and the effective combination of the filler and the paint film forming material can further enhance the properties of the coating. The isocyanate-grafted high-strength high-modulus polyvinyl alcohol fiber, which is prepared by carrying out grafting reaction on the hydroxyls on the surface of the high-strength high-modulus polyvinyl alcohol fiber and isocyanates, is used as the filler. The anti-cavitation coating prepared by applying the paint at normal temperature has the characteristics of easy production, simple application, light weight, erosion resistance, corrosion resistance and the like, and is mainly used for protecting propellers, pumps, valves, pipelines and the like in a cavitation environment.

The invention relates to a polysiloxane and quaternary ammonium salt-containing antibacterial gelatin leather finishing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving gelatin in water to prepare aqueous solution with mass concentration of 2-20 percent; adding epoxy quaternary ammonium salt into a first reaction flask under the conditions of temperature of 40-70 DEG C and pH of 6-12 to obtain solution 1; adding a surfactant into a second reaction flask, continuously stirring, and meanwhile adding Si-O-Si repetitive unit-containing epoxypolysiloxane in batches or continuously to obtain solution 2, wherein the using amount of the surfactant is 2-20 percent of the mass of the gelatin; mixing the solution 1 and the solution 2 in different proportions, weighing 15-20 g of the mixed solution to be placed in a mold of polytetrafluoroethylene, adding 5-10 mL of one or two or three of ethanol, tetrahydrofuran and methanol and drying in a normal pressure drying oven at the temperature of 40-80 DEG C to obtain the multifunctional gelatin leather finishing agent. The finishing agent has the characteristics of antibacterial property, adjustable hydrophilia and hydrophobicity, flexible film, strong anti-oxidant capacity and the like.

The invention discloses a nursing baking lamp with a traditional Chinese medicine fumigation function. The nursing baking lamp comprises a base, a lifting adjusting device is fixedly mounted on an upper portion of the base, and a nursing baking lamp body is fixedly mounted on the lifting adjusting device. The nursing baking lamp is high in applicability; the distance between the nursing baking lamp body and a wound part of a patient can be adjusted conveniently, so that the circumstances of scalding the patient due to short distance and obtaining a bad therapeutic effect due to long distance can be avoided; recovery of the patient is accelerated since a traditional Chinese medicine fumigation function is provided; maintenance and utilization in a later period are facilitated since the nursing baking lamp is convenient to dismount and mount; the nursing backing lamp is suitable for the patient with a wounded limb, which fills the blank that no nursing baking lamp is specially designed for the patient with the wounded limb; a U-shaped groove is arranged to support the wounded limb of the patient, so that the patient can take easy during therapy of the nursing baking lamp, and no physical burden on the patient is increased; a prepared protection layer is prepared, which is particularly important that a surface of a square shell can be protected from being contaminated by bacteria.

The invention relates to a production method of corrosion-resistant color steel plates. The production method comprises the following steps: (1) steel plate surface treatment: napping the surface of a steel plate with a napping machine, preheating the treated steel plate to 100 to 200 DEG C, and removing stress of the heated steel plate; (2) powder coating spraying: sending the steel plate obtained in the step (1) into powder spraying equipment, spraying powder coating on the surface of the steel plate uniformly with a powder spraying gun; (3) curing: sending the steel plate obtained in the step (2) into a curing oven till the coating is cured completely, wherein the curing temperature is 200 to 240 DEG C, and the curing time is 8 to 15 min. The preparation method has the advantages that the thickness of the coating can reach 70 to 120 microns; the density of the molecular structure of the coating is enhanced; the performance indexes of the steel plate are 5 to 6 times of those of a common color pre-coated steel plate in the aspects of thickness, hardness, corrosion resistance and scratching resistance. The steel plate finished product is wide in application range, can be widely used in corrosion-resistant buildings, wall bodies, tiles on a roof to prolong the service lives of the buildings, and has the advantages that the use cost of a user is reduced; the steel resource is saved; the natural environment is protected.

A scupper joint for a ship includes a body and a nut. The body has a tubular structure as a piece cut from a seamless tube. The tubular structure has a first section and a second section. The first section has a flange at one end thereof as an evagination and a threaded segment at an outer periphery thereof. The second section has at least one annular protrusion at an outer periphery thereof. The nut has an annular structure. The tubular structure has an end evaginated to form a flange and has an inner wall threaded to form a threaded segment. The threaded segment of the nut and the threaded segment of the first section are configured to couple with each other.