48results about How to "Improve rust resistance" patented technology

The utility model relates to a vehicle-mounted ceiling screen support assembly formed by punching a galvanized steel sheet, which comprises a fixed support, an overturning component, a supporting component and a spring bolt component, the fixed support is made of the galvanized steel sheet formed by punching, a reinforcing structure is formed on the surface of the fixed support, and a screw hole is formed on the surface of the fixed support; the overturning assembly and the supporting assembly are symmetrically arranged on the two opposite sides of the screen. A side opening clamping structure is arranged on a shell of the overturning assembly and a shell of the supporting assembly, a vibration isolation sleeve is embedded in the clamping structure, a center through hole is formed in the vibration isolation sleeve, the vibration isolation sleeve is fixed to the screw hole through a step screw, and the outer diameter of the step face of the step screw is in interference fit with the inner diameter of the center through hole of the vibration isolation sleeve. According to the vehicle-mounted ceiling screen support assembly formed by stamping the galvanized steel sheet, the galvanized steel sheet formed by stamping is adopted as a core structure, all the components are optimally designed, and the effects that cost is reduced, structural strength is improved, vibration isolation and assembly are simplified, and installation adaptability is enhanced are achieved.

This invention discloses a water-soluble punching and shearing oil, comprising the following components in 100 parts by weight: 20.0-35.0 parts rust inhibitor; 10.0-20.0 parts lubricant; 3.0-10.0 parts surfactant; 0.5-3.5 parts bactericide and mildew inhibitor; 0.5-2.0 parts other additives; and the balance being deionized water. This punching and shearing oil can be used in various sheet metal deep drawing and punching processes. It can be diluted for use, effectively reducing users' oil costs. Simultaneously, it avoids oil mist and VOC problems caused by using oily products in the workshop, thus purifying the workshop operating environment. Parts punched and sheared using this invention have smooth surfaces, complete cuts, good gloss, and are burr-free. Processed parts are easy to clean or require no cleaning, significantly saving on overall costs such as materials, water resources, and labor.

A rust-preventive film comprising at least recycled polyethylene, a vaporizable rust inhibitor, and an antioxidant, wherein the vaporizable rust inhibitor is selected from carboxylic acid esters and heterocyclic aromatic compounds, and the antioxidant is a phenolic antioxidant.

The utility model discloses a kind of flat steel clamping assembly structure, including assembly groove and clamp, clamp includes two clamping pieces oppositely arranged along assembly groove extension direction, each clamping piece sequentially includes locking portion, clamping portion and with the stop portion of assembly groove cooperation, the clamping space for fixing flat steel is enclosed between the clamping portion of two clamping pieces and assembly groove;Clamping portion is L-shaped as a whole, including the first clamping section and the second clamping section of mutual connection, the end of first clamping section away from the second clamping section is connected with locking portion, the end of second clamping section away from first clamping section is connected with stop portion, locking portion and stop portion extend in direction of away from first clamping section, the end of first clamping section and locking portion compared with the end of first clamping section and second clamping section connection is inclined to the inside of clamping space. The above structure effectively improves the convenience, flexibility, reliability and versatility of flat steel clamping structure / device actual use.

The utility model provides a tapping oiling device for a metal product machining center, which relates to the technical field of metal machining and comprises a base, a tapping mechanism is fixedly connected to the top of the base, and a fixing plate is fixedly connected to one side of the tapping mechanism. According to the tapping and oiling device for the metal product machining center, through the arrangement of the recycling assembly, when the tapping and oiling device is used, a water pump runs to drive lubricating oil in an oil tank to be conveyed into a water conveying pipe, then the lubricating oil is sprayed out through an atomizing nozzle for oiling and lubricating, dripped waste oil is concentrated into the recycling box, a connecting frame supports and fixes a filter screen, and the filter screen can filter large-particle impurities in the waste oil; a small amount of impurities in the waste oil can be settled by the settling pond, and the lubricating oil concentrated in the recycling pond can be discharged from the water outlet pipe for reuse, so that the effect of recycling the oil is achieved, and the conditions of waste of the lubricating oil and increase of the production cost caused by direct discarding of the waste oil and continuous supplementation of new oil in a traditional oiling device are avoided.

This utility model aims to provide a device for automatically drying vehicle axle shells after soaking and cleaning. It includes a left drying chamber, a right drying chamber, a traction mechanism, and axle shell material carts. The left and right drying chambers are symmetrically arranged with a slide rail in the middle. The traction mechanism is mounted on the slide rail, with a set of axle shell material carts fixed at each end. The traction mechanism can move left and right along the slide rail. When the traction mechanism moves to the left end of the slide rail, the axle shell material cart at its left end is fed into the left drying chamber, while the axle shell material cart at its right end remains outside the right drying chamber. Conversely, when the traction mechanism moves to the right end of the slide rail, the axle shell material cart at its right end is fed into the right drying chamber, while the axle shell material cart at its left end remains outside the left drying chamber. This device is used to transport manually cleaned axle shells to the drying chamber for drying. This device overcomes the shortcomings of existing technologies and has the advantages of high efficiency, immunity to environmental factors, effective prevention of secondary pollution, improved quality of subsequent processes, and beneficial storage.

This invention belongs to the field of metal rust prevention technology, specifically relating to an environmentally friendly water-based rust-preventive composition, its preparation method, and its application. The composition comprises, by weight, 3-8 parts of a first triazine compound, 1-5 parts of a second triazine compound, 10-20 parts of 2-amino-2-methyl-1,3-propanediol, 2-5 parts of dipropylene glycol monomethyl ether, and 65-85 parts of water. The first triazine compound is a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, and the second triazine compound is a triazine compound having thiol substituents. This invention forms a dual-anchored protective film on the metal surface through the two triazine compounds, exhibiting excellent salt spray resistance, damp heat resistance, and film density. It achieves a salt spray test duration of 72 hours, a damp heat test duration of 960 hours, and an adhesion rating of 0. Furthermore, it is free of nitrites, phosphates, and heavy metals. The preparation method is simple, suitable for industrial production, and can be widely applied to metal rust prevention in machinery manufacturing, automotive parts, and other fields.

The connecting rod for the excavator bucket comprises a connecting rod body, an anti-rust layer is arranged on the surface of the connecting rod body, the anti-rust layer comprises an acrylic acid anti-rust coating and an iron red alcohol acid anti-rust coating, a wear-resistant layer is arranged on the other face of the anti-rust layer, and the wear-resistant layer comprises a tungsten carbide coating and a nanometer chromic oxide coating. The surface of the connecting rod body is coated with the iron red alcohol acid antirust coating, the other face of the iron red alcohol acid antirust coating is coated with the acrylic acid antirust coating, the thickness of the acrylic acid antirust coating is the same as that of the iron red alcohol acid antirust coating, and the thickness of the iron red alcohol acid antirust coating is one hundred fifty to two hundred fifty micrometers. According to the wear-resistant connecting rod, the wear-resistant layer is arranged, the tungsten carbide coating contained in the wear-resistant layer can carry out first-layer wear-resistant protection treatment on the connecting rod body, and the nano chromium oxide coating can carry out second-layer wear-resistant protection treatment on the connecting rod body after the tungsten carbide coating is damaged, so that the wear resistance of the whole connecting rod body is effectively improved.

The utility model discloses a composite coating rust-proof hexagon nut, which belongs to the technical field of mechanical parts and comprises a hexagon nut body, a protective bottom plate is fixedly mounted at the bottom of the hexagon nut body, a supporting frame is fixedly mounted on the outer side of the top of the protective bottom plate, and a limiting telescopic rod is fixedly mounted at the bottom of an inner cavity of the supporting frame. A protection frame is fixedly installed at the top of the limiting telescopic rod, a compression spring is fixedly installed at the bottom of an inner cavity of the supporting frame, a bottom layer, a middle layer and a surface layer are arranged on the outer side surface of the hexagonal nut body, the bottom layer covers the outer side of the hexagonal nut body, and the middle layer covers the outer side of the bottom layer; and the surface layer covers the outer side of the middle layer. According to the anti-rust hexagonal nut, the hexagonal nut body can be protected, the outside of the hexagonal nut body is prevented from being damaged, the practicability of the anti-rust hexagonal nut is improved, the anti-rust performance of the anti-rust hexagonal nut is greatly improved, and the service life of the anti-rust hexagonal nut is greatly prolonged through the synergistic effect of the coatings.

The present application relates to the field of metal processing cooling liquid, especially to a special drawing cooling liquid for aluminum pop can production and a preparation method thereof.The special drawing cooling liquid for aluminum pop can production comprises, in mass percentage, 5-25% of carbon material reinforcing liquid, 5-15% of surfactant, 5-15% of functional additive, 1-5% of antibacterial agent, 5-10% of complexing agent, 1-5% of oil control agent, 0.1-5% of pH regulator, 0.01-0.1% of defoaming agent, and the rest of deionized water.The processing cooling liquid provided in the present application can be used as a special drawing cooling liquid for the drawing and thinning process of aluminum pop can, and can play excellent drawing cooling, lubrication and rust prevention functions simultaneously.

The present application relates to the technical field of hydraulic transmission oil, and particularly relates to a hydraulic transmission oil composition with high shear stability and a preparation method thereof. The hydraulic transmission oil composition comprises the following components in parts by weight: base oil 85-99 parts, composite additive 0.1-5 parts, viscosity index improver 1-10 parts, pour point depressant 0.1-2 parts, and anti-foaming agent 0.001-0.1 part. The base oil is at least one of type I, type II and type III base oil. The viscosity grade of the base oil is No. 4, No. 6 or No. 8. The hydraulic transmission oil composition has high shear stability, good low-temperature performance, good copper strip corrosion resistance and good rust prevention, and can be used in vehicle hydraulic couplings and hydraulic torque converters, and can also be used in the hydraulic transmission system of engineering machinery.

The application provides a kind of vehicle grease composition and its preparation method.The vehicle grease composition comprises the following components by weight: base oil 60-92 parts, thickener 8-40 parts, friction modifier additive 1-10 parts;The thickener is selected from one or more of polyurea soap powder, composite calcium sulfonate soap powder and amide sodium soap powder.The vehicle grease composition provided by the application can greatly reduce the dependence of vehicle grease on lithium resources, while the comprehensive performance is excellent, meets the lubrication demand of commercial vehicle hub bearing, and the process is stable and feasible.

The invention provides a method for treating a brake disc through enhanced ferrite nitrocarburizing oxidation and the brake disc manufactured through the method. The brake disc is subjected to stress relief annealing, multi-stage pre-oxidation treatment, multi-stage nitriding treatment, multi-stage post-oxidation treatment and cooling treatment; and key parameters such as process temperature, atmosphere concentration and treatment duration of each stage are regulated and controlled. According to the brake disc manufactured through the treatment, the abrasion resistance is remarkably improved, the rust resistance and the corrosion resistance are enhanced, and the thickness of the white bright layer is uniform and consistent. The brake disc treated by adopting the method disclosed by the invention smoothly passes a braking particulate matter emission test of the Europe 7 standard, and the dual advantages of the brake disc in the aspects of environmental protection performance and braking performance are proved.

The present application relates to the production manufacturing field, especially to a differential housing rust-proof treatment equipment, which can spray rust-proof oil on the differential housing from multiple directions to improve the rust-proof effect. The differential housing rust-proof treatment equipment comprises a treatment machine body and a first oil pump, etc., the top middle of the treatment machine body is connected with the first oil pump, the first oil pump is communicated with an external oil storage tank, and further comprises an internal spraying mechanism and a bottom spraying mechanism, etc., the upper part of the treatment machine body is provided with the internal spraying mechanism for spraying rust-proof oil on the inside of the differential housing, and the lower part of the treatment machine body is provided with the bottom spraying mechanism for spraying rust-proof oil on the bottom of the differential housing. The present application can spray rust-proof oil on the inside of the differential housing through the sprayer and on the bottom of the differential housing through the second nozzle, so as to realize the effect of spraying rust-proof oil on the differential housing from multiple directions and improve the rust-proof performance of the differential housing.

This invention discloses a groove edge conditioner for vegetable oil-based cutting fluids and its preparation method. The groove edge conditioner is composed of the following components by weight percentage: 35%–40% rust-inhibiting emulsifier, 25% alcohol ether solvent, 25% mixed ether carboxylic acid, 2% antibacterial agent, and water as the balance. The rust-inhibiting emulsifier is prepared by mixing and reacting cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid at a molar ratio of 4–5:1:3 at high temperature. Adding the groove edge conditioner of this invention to a vegetable oil-based cutting fluid bath that has become sticky significantly improves the high-temperature stability of the bath and the rust prevention of cast iron chips, while not affecting the corrosion inhibition performance of aluminum alloys.

The utility model relates to the field of building decoration discloses U type corner guard net, including corner guard net body, the corner guard net body is integrally punch formed by a galvanized sheet, the corner guard net body is without any welding structure after forming, the both sides edge of corner guard net body is provided with grid respectively, the grid is used for strengthening the adhesion of plastering layer and corner guard net body when plastering and puttying, the middle part of corner guard net body forms U type groove, the U type groove is used for accommodating the accessory for decoration to realize the decorative modeling function, the grid and corner guard net body are integrally formed by the same galvanized sheet through stamping, and the mesh shape of grid is diamond. In the utility model, the corner guard net body is integrally punch formed by a galvanized sheet, and there is no any welding structure, can more stably provide the shaping support for the wall corner, the decorative line, ensures that the modeling keeps regular after the decoration is completed, reduces the secondary maintenance because of the corner deformation, and further improves the durability of wall decoration quality.

The invention provides high-temperature-resistant anti-rust oil as well as a preparation method and application thereof. The high-temperature-resistant anti-rust oil comprises the following components in parts by weight: 65-80 parts of base oil, 2-6 parts of an anti-rust agent, 1-5 parts of an antioxidant, 1-4 parts of a corrosion inhibitor, 0.5-2 parts of a film-forming agent and 0.05-0.85 part of a high-temperature stabilizer, the high-temperature stabilizer is formed by mixing montmorillonite and an N-containing nano material, and the N-containing nano material is prepared by reacting 3, 5-diamino-4-chlorobenzenesulfonic acid with p-hydroxybenzoic acid. The high-temperature-resistant anti-rust oil provided by the invention has excellent anti-rust performance and high-temperature stability.

This invention relates to the field of rust prevention. In order to improve the safety and rust prevention performance of rust-preventive coatings, a rust-preventive coating and its preparation method are provided. The preparation method includes the following steps: (1) Sodium hydroxide is added to an aqueous solution of zinc acetate and dispersed evenly. The solution is reacted in a hydrothermal reactor at 160-180℃ for 8-14 h to obtain nano-zinc oxide with a flower cluster structure. The molar ratio of sodium hydroxide to zinc acetate is (2-5):10; (2) The nano-zinc oxide obtained in step (1) is prepared into an aqueous solution, oxalic acid is added, and the solution is reacted in a hydrothermal reactor at 140-160℃ for 10-14 h to obtain an aqueous solution of zinc oxalate; (3) An additive is added to the aqueous solution of zinc oxalate obtained in step (2) to prepare a rust-preventive coating. This invention utilizes a hydrothermal method to generate zinc oxide with a specific morphology, which is then reacted with oxalic acid to obtain zinc oxalate. The prepared coating has excellent rust prevention performance.

The utility model relates to the technical field of naked eye display, in particular to a dynamic naked eye panoramic all-digital immersive display device with a transverse cylindrical lower section, which comprises a transverse cylindrical frame, a light-emitting diode (LED) display screen module, a rectangular galvanized steel pipe and a fixing piece. The curvature radius of the rectangular galvanized steel pipe is matched with the diameter of the transverse cylindrical frame, and the rectangular galvanized steel pipe is distributed in the axial direction of the cylindrical frame and used for supporting the LED display screen module. U-shaped clamps arranged at the corners of the display screen are adopted as the fixing pieces and matched with strip-shaped clamping grooves in the inner sides of the galvanized steel pipes, connection stability is enhanced through built-in magnet pieces, rapid mounting and dismounting are facilitated, the equipment further comprises fixing frames arranged at the two ends of the transverse cylindrical frame in a sleeving mode, the overall structural strength is further improved, and the equipment is compact in structure, high in visual immersion sense and high in practicability. The method is suitable for scenes such as virtual reality, exhibition display and game experience, and high-quality naked eye panoramic dynamic image presentation is realized.

The invention belongs to the field of special oil for hydraulic systems, and particularly relates to a long-life hydraulic oil composition and a preparation method thereof. The long-life hydraulic oil composition is prepared from the following raw materials in percentage by mass: 0.01%-1.0% of an amine antioxidant, 0.01%-1.0% of a phenol antioxidant, 0.01%-1.0% of an antioxidant and antiwear agent, 0.1%-1.0% of an antirust agent, 0.01%-0.1% of a metal deactivator, 0.01%-0.1% of an anti-foaming agent and 95.8%-99.85% of base oil. According to the long-life hydraulic oil composition, the service life and the oil change period of hydraulic oil can be effectively prolonged through an antioxidant phenol-ammonia compounding technology, an oil product has excellent oxidation resistance, rust resistance, abrasion resistance, ultra-long service life and the like, especially has excellent high-temperature oxidation resistance, the service life of hydraulic equipment can be prolonged in a harsh working environment, and the service life of the hydraulic equipment is prolonged. The oil change period is prolonged.

The application relates to the technical field of grinding fluids for metal processing, and discloses a metal grinding fluid and a preparation method thereof. The metal grinding fluid is prepared from the following raw materials in percentage by mass: deionized water 60-70%, lubricant 5-15%, organic alkali 9-15%, antirust agent 5-10%, bactericide 2-5%, settling agent 0.1-0.5%, defoaming agent 0.2-0.3% and copper corrosion inhibitor 0.3-0.5%. The metal grinding fluid takes deionized water as a basic component and is compounded with lubricant, organic alkali, antirust agent, bactericide, settling agent, defoaming agent and copper corrosion inhibitor, so that the synthesized grinding fluid has excellent antirust performance, good cleaning and chip removal performance and good cooling performance. Moreover, the polyether ester and organic molybdenum are selected as the lubricant, the synergistic lubrication effect is realized, the friction-reducing and wear-resisting capacity of the grinding fluid is greatly improved compared with the lubricant used alone, and the metal grinding fluid can meet the grinding lubrication requirements of difficult-to-machine metals.

This invention provides a hydraulic oil prepared from the following raw materials: 0.1-1.0 wt% ionic liquid, 0.5-1.5 wt% hydraulic oil compound, and the balance base oil. This application also provides a method for preparing the ionic liquid. Furthermore, this application also provides a method for preparing the hydraulic oil. Compared with traditional ionic liquids containing fluorine, imidazole, and other groups, the ionic liquid provided in this application is prepared using bio-based raw materials, making it clean and environmentally friendly, and the synthesis steps are simple. The hydraulic oil provided in this application, after incorporating the ionic liquid, significantly improves its demulsification properties, and it also exhibits good extreme pressure anti-wear properties, excellent friction-reducing properties, and can solve the practical engineering problem of hydraulic cylinder vibration.

The utility model discloses an automobile engine cover coating electrophoresis jig, and relates to the technical field of automobile manufacturing, the automobile engine cover coating electrophoresis jig comprises a rack, a locking mechanism and a first limiting mechanism, the rack is provided with a mounting cavity through which at least partial structure of a water tank cross beam passes, the locking mechanism comprises a first locking piece, a second locking piece and a connecting piece, the first locking piece and the second locking piece are both connected with the connecting piece, and the first limiting mechanism can limit the connecting piece from moving to the rotating position from the locking position. According to the technical scheme, a double-locking structure of the first locking piece and the second locking piece is adopted, the first locking piece and the second locking piece act on the engine cover and the water tank cross beam respectively in the locking position state, a stable stress system is formed, the engine cover can be kept at a fixed opening angle, and the service life of the engine cover is prolonged. The engine cover is effectively prevented from shaking or being accidentally opened in the electrophoresis process, the situation that an inner plate coating is uneven due to the fact that the angle is unstable is avoided, the consistency of coating quality is guaranteed, and the anti-rust performance is improved.

The invention discloses a corrosion inhibitor composition. The corrosion inhibitor composition comprises a compound shown in a formula I and an anti-rust agent. The corrosion inhibitor composition has excellent oil solubility, can be used for preparing anti-rust oil in lubricating oil and lubricating grease, and has general applicability. The corrosion inhibitor composition can obviously improve the oxidation resistance of anti-rust oil, improves the function of inhibiting copper corrosion, and also has an effect of improving the anti-rust performance.

This invention relates to the field of metallic materials technology, specifically disclosing a lightweight, high-strength seamless steel pipe for fitness equipment and its manufacturing process. The manufacturing process for the lightweight, high-strength seamless steel pipe for fitness equipment includes the following steps: 1. Normalizing a high-strength low-alloy steel pipe to obtain a pre-treated steel pipe; 2. Polishing the surface of the pre-treated steel pipe to obtain a polished steel pipe; 3. Spraying a protective liquid onto the surface of the polished steel pipe and drying it to obtain a pre-protected steel pipe; 4. Heating the pre-protected steel pipe to 100-105℃, holding it at that temperature for 20-30 minutes, and allowing it to cool naturally to obtain the lightweight, high-strength seamless steel pipe for fitness equipment. The protective liquid includes: solvent, water-based acrylic resin, film-forming aid, filler, coupling agent, processing aid, and modifier; the modifier is a compound of guar gum, guar gum, and jujube gum. This invention has the advantage of further improving the corrosion resistance of the lightweight, high-strength seamless steel pipe.

The application relates to the technical field of surfactants, in particular to a low-foaming composite surfactant and application thereof in metal cutting, characterized in that the low-foaming composite surfactant is composed of 55-65% of nonionic surfactant, 4-12% of anionic surfactant, 10-20% of co-surfactant, 3-12% of functional additive and the balance of deionized water; the nonionic surfactant at least contains fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether; the anionic surfactant is selected from one or more of sodium alkyl benzene sulfonate, sodium fatty alcohol ether sulfate and alpha-olefin sulfonate; the co-surfactant at least contains alkyl glycoside; and the functional additive contains defoaming agent and antirust agent. The foam elimination efficiency is greatly improved through optimization of the nonionic surfactant combination and adoption of a special defoaming agent compounding scheme, and the generation and accumulation of foam in the cutting process are effectively inhibited.

This invention provides a reciprocating air compressor lubricating oil composition, comprising the following components by mass percentage: 0.1%-1% ionic liquid, 1%-5% antioxidant, 0.02%-1% metal passivator, 0.02%-1% rust inhibitor, 0.01%-0.5% extreme pressure anti-wear agent, 0.002%-0.02% demulsifier, 0.002%-0.02% antifoaming agent, with the balance being base oil. This reciprocating air compressor lubricating oil composition, comprising specific amounts of ionic liquid, antioxidant, metal passivator, rust inhibitor, extreme pressure anti-wear agent, demulsifier, antifoaming agent, and base oil, is beneficial for improving oxidation resistance, corrosion resistance, rust prevention, anti-wear properties, demulsification properties, and antifoaming properties, exhibiting superior comprehensive performance and broad application prospects.

This utility model relates to an insulating and rust-proof cable clamp, comprising a clamp body composed of several clamps and a cable lifting assembly installed on the outside of the clamp body for carrying cables. Each clamp has connecting lugs extending outwards at both ends. Every two adjacent connecting lugs in the clamp body are connected and fixed by fasteners, so that the clamps together form a ring adapted to a utility pole. The cable lifting assembly is inserted outside two adjacent connecting lugs in the clamp body, and is also connected and fixed to the two adjacent connecting lugs by fasteners. The cable lifting assembly has a V-shaped groove for supporting cables passing through it. The support frame and pressure cap of the cable lifting assembly can cooperate to confine the cable within the V-shaped groove, allowing cables of different diameters to be placed and supported within the cable lifting assembly, thereby improving the applicability of the device.

This invention provides a metal cutting oil, its preparation method, and its application. The metal cutting oil comprises the following components by mass percentage: 10-15% oiliness agent, 3-5% extreme pressure agent, 0.5-1% antioxidant, and the balance being base oil; wherein the oiliness agent is composed of a base oil with a viscosity of 30-450 mmHg. 2 / s high viscosity oily agent with viscosity of 5-15mm 2 The low-viscosity oily agent is composed of a mass ratio of 5:(1-7). The cutting oil provided by this invention has good extreme pressure lubrication performance and high and low temperature stability, and can prevent phenomena such as tool sticking and welding during aluminum alloy cutting. It is suitable for cutting aluminum alloys.

The present application relates to the field of copper-clad plate packaging, and particularly discloses a packaging method for small-size ceramic copper-clad plate; the small-size ceramic copper-clad plate is coated with a rust-proof film on the outside; the rust-proof film comprises, from top to bottom, a base layer, a functional layer and a base layer; the base layer comprises linear polyethylene, modified polyethylene and metallocene polyethylene; the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene and an anticorrosive agent; the preparation of the anticorrosive agent comprises the following steps: taking morpholine, ethanol and benzotriazole, mixing uniformly, adding formaldehyde, stirring, adding urea and polyaspartic acid, reflux heating, cooling, filtering, washing, drying, and obtaining the anticorrosive agent; the preparation of the modified polyethylene comprises the following steps: taking hydroxylated polyethylene, 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, sodium alginate and water, adding sulfuric acid to a pH of 3-4, heating and reacting, removing the solvent, and drying to obtain the modified polyethylene.