High-strength alloy steel plate material and processing technology thereof

Abstract

The application relates to the technical field of alloy steel, in particular to a high-strength alloy steel plate and a processing technology thereof. The application comprises the following steps: S1, raw materials are smelted by a vacuum induction furnace, and casting is carried out to obtain a steel ingot; S2, the steel ingot is subjected to homogenization treatment and forging treatment to obtain a plate; S3, modified cerium oxide, modified graphene oxide-MOFs material and deionized water are uniformly mixed, ultrasonic treatment is carried out for 1-2 hours, then water-based epoxy resin, a curing agent, a leveling agent and a defoaming agent are uniformly mixed to obtain corrosion-resistant paint; and S4, after the plate is subjected to solid solution treatment and aging treatment, the corrosion-resistant paint is coated on the plate, and after drying and curing, a corrosion-resistant coating is formed, thereby obtaining the high-strength alloy steel plate. The high-strength alloy steel plate prepared by the application has excellent corrosion resistance and adhesion, thereby prolonging the service life.

Description

Technical Field

[0001] This invention relates to the field of alloy steel technology, specifically to a high-strength alloy steel sheet and its processing technology. Background Technology

[0002] With the development of industry and manufacturing, the performance requirements for materials are constantly increasing. High-strength alloy steel plates, due to their excellent mechanical properties and corrosion resistance, are widely used in aerospace, automotive, shipbuilding, and construction fields. These materials are typically improved in strength and toughness through alloying, heat treatment, and cold working processes to meet the needs of specific applications.

[0003] However, traditional high-strength alloy steel sheets are prone to oxidation and corrosion in humid or corrosive environments, especially in marine or chemical industrial fields, which limits their service life. Furthermore, existing surface treatment technologies, such as spraying or galvanizing, while improving corrosion resistance to some extent, often result in the protective layer easily peeling off or being damaged, exposing the steel to corrosive environments. Under extreme temperature and humidity variations and other environmental conditions, their corrosion resistance is unstable, making it difficult to meet the needs of some special applications.

[0004] Therefore, we propose a high-strength alloy steel sheet and its processing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength alloy steel sheet and its processing technology to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A processing technology for high-strength alloy steel plates includes the following steps:

[0008] Step S1: The raw materials are smelted in a vacuum induction furnace and then cast to obtain steel ingots;

[0009] Step S2: The steel ingot is homogenized and forged to obtain a plate.

[0010] Step S3: Mix modified cerium oxide, modified graphene oxide-MOFs material and deionized water evenly, sonicate for 1-2 hours, then add waterborne epoxy resin, curing agent, leveling agent and defoamer and mix evenly to obtain corrosion-resistant coating.

[0011] Step S4: After solution treatment and aging treatment of the plate, a corrosion-resistant coating is applied, and after drying and curing, a corrosion-resistant coating is formed, resulting in a high-strength alloy steel plate.

[0012] Furthermore, in step S1, the temperature of vacuum induction melting is 1550-1580℃.

[0013] Furthermore, in step S2, the homogenization temperature is 1160-1200℃, and the homogenization time is 8-16h.

[0014] Furthermore, in step S2, the forging process conditions are: initial forging temperature 1200-1250℃, holding time 2-4h, and final forging temperature 900-920℃.

[0015] Furthermore, in step S4, the solution treatment temperature is 880-1000℃ and the solution treatment time is 2-6h; the aging treatment temperature is 500-600℃ and the aging treatment time is 1-5h.

[0016] Furthermore, in step S1, the chemical composition of the raw materials, by mass percentage, is as follows: C: 0.15-0.30%, Si: 0.05-0.20%, Mn: 0.4-1.2%, Cr: 3.5-4.0%, Mo: 2.54-3.28%, Ni: 0.34-0.56%, Nb: 0.02-0.03%, Ti: 0.01-0.02%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe.

[0017] Furthermore, the corrosion-resistant coating is composed of the following components in parts by weight: 40-60 parts of waterborne epoxy resin, 10-15 parts of modified cerium oxide, 5-10 parts of modified graphene oxide-MOFs material, 30-50 parts of deionized water, 8-15 parts of curing agent, 0.1-0.3 parts of leveling agent, and 0.1-0.3 parts of defoamer.

[0018] Furthermore, the preparation method of the modified cerium oxide is as follows:

[0019] Step A: Cerium oxide is ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, γ-aminopropyltriethoxysilane is added and mixed evenly, and reacted at 70-80℃ for 3-5 hours. After centrifugation, washing and drying, aminated cerium oxide is obtained.

[0020] Step B: Mix aminated cerium oxide, paraformaldehyde and 1,4-dioxane evenly, add a mixed solution of cashew phenol and 1,4-dioxane dropwise over 30-50 minutes, react at 80-90℃ for 8-10 hours, and obtain the intermediate by rotary evaporation;

[0021] Step C: Mix the intermediate, 2-mercaptoethylamine and photoinitiator evenly, and react under ultraviolet light for 0.5-2.0 h to obtain modified cerium oxide.

[0022] Furthermore, in step A, the mass ratio of cerium oxide, anhydrous ethanol, deionized water and γ-aminopropyltriethoxysilane is 1:(15-20):(3-5):(2-4).

[0023] Furthermore, in step B, the mass ratio of aminated cerium oxide, paraformaldehyde, and 1,4-dioxane is 1:(0.5-1.0):(12-15).

[0024] Furthermore, in step B, the mass of cashew phenol is 3-5 times the mass of paraformaldehyde.

[0025] Furthermore, in step B, the mass ratio of cashew phenol to 1,4-dioxane is 1:(2-4).

[0026] Furthermore, in step C, the mass ratio of the intermediate, 2-mercaptoethylamine, and photoinitiator is 1:(2-4):(0.03-0.05).

[0027] Furthermore, the photoinitiator is 2-hydroxy-2-methylphenylacetone.

[0028] Furthermore, the process conditions for ultraviolet light irradiation are: irradiation wavelength 360-400nm, irradiation intensity 20-35mW / cm². 2 .

[0029] In the above technical solution, cerium oxide is surface modified by γ-aminopropyltriethoxysilane to introduce amino groups, resulting in aminated cerium oxide, which improves its dispersibility and compatibility. Furthermore, cashew phenol and paraformaldehyde are used to conduct a Mannich reaction with the amino groups in the aminated cerium oxide to introduce benzoxazine structures and double bonds, preparing an intermediate that helps improve the thermal stability and corrosion resistance of the epoxy resin. However, the double bonds on the intermediate chain are very unstable, resulting in poor corrosion resistance. Under prolonged light exposure, the coating is prone to discoloration. Therefore, this application further introduces 2-mercaptoethylamine. Through the mercapto-alkene click reaction between the thiol group and the double bond of 2-mercaptoethylamine, an amino group is introduced, thereby improving its compatibility and binding force, and enhancing the corrosion resistance and durability of the coating.

[0030] Furthermore, the preparation method of the modified graphene oxide-MOFs material is as follows:

[0031] Step (1): Graphene oxide is ultrasonically dispersed in deionized water to form a dispersion. The pH of the system is adjusted to 10-11 using potassium hydroxide solution. L-cysteine ​​is added and reacted at 85-95℃ for 8-10 hours. After centrifugation, washing, and drying, modified graphene oxide is obtained.

[0032] Step (2): Mix the modified graphene oxide and methanol evenly, add anhydrous cobalt acetate, and add a mixed solution of 2-methylimidazole and methanol dropwise over 1-2 hours. Stir for 20-40 minutes and let stand for 22-24 hours. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0033] In the above technical solution, graphene oxide is modified by L-cysteine ​​to achieve thiol functionalization, resulting in modified graphene oxide. The thiol groups exhibit a strong affinity for heavy metal ions due to Lewis acid-base interactions. MOFs are novel organic-inorganic hybrid porous nanoparticles, and ZIF-67 is composed of Co... 2+ The highly regular porous nanofiller formed by coordination with 2-methylimidazole (2-IM), Co in ZIF-67 2+ The ligand 2-methylimidazole, as an effective corrosion inhibitor for metals, can significantly improve the active corrosion protection performance of organic coatings; ZIF-67 nanoparticles, through Co... 2+ The modified graphene oxide-MOFs material is obtained by interacting with the carboxyl, thiol and hydroxyl groups on the surface of the modified graphene oxide.

[0034] Furthermore, in step (1), the concentration of the dispersion is 2-3 g / L.

[0035] Furthermore, in step (1), the mass of L-cysteine ​​is 1.2-1.5 times the mass of graphene oxide.

[0036] Furthermore, in step (2), the mass ratio of modified graphene oxide, methanol, and anhydrous cobalt acetate is 1:(100-200):(10-12).

[0037] Furthermore, in step (2), the mass of 2-methylimidazole is 2.2-2.5 times the mass of anhydrous cobalt acetate, and the mass ratio of 2-methylimidazole to methanol is 1:(4-5).

[0038] Furthermore, the thickness of the anti-corrosion coating is 100-200 μm.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] This invention discloses a high-strength alloy steel sheet and its processing technology. Modified cerium oxide and modified graphene oxide-MOFs materials are used as corrosion-resistant fillers, ultrasonically dispersed in deionized water, and combined with the combined action of waterborne epoxy resin and various additives to obtain a highly efficient corrosion-resistant coating. The modified cerium oxide and modified graphene oxide-MOFs materials work synergistically to improve the corrosion resistance, adhesion and mechanical strength of the coating, thereby significantly extending the service life and application effect of the coating. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In this embodiment, the waterborne epoxy resin is Dow DER-916; cerium oxide has a particle size of 10-20 μm and is sourced from Shanghai Yaotian New Material Technology Co., Ltd.; graphene oxide is DN-20DY, with an average thickness of 1-3 nm, a diameter of 4-7 μm, and 2-5 layers, sourced from Zhejiang Zhitai Nanomaterials Co., Ltd.; leveling agent is Keying KYC-615; defoamer is BYK-028; and curing agent is polyamide 650, sourced from Jinan Langsheng New Material Co., Ltd.

[0043] In the following examples and comparative examples, 1 part equals 10g.

[0044] Example 1: A processing technology for high-strength alloy steel plates, comprising the following processes:

[0045] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1550℃) and then cast to obtain steel ingots;

[0046] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1160℃, time 8h) and forging treatment (initial forging temperature 1200℃, holding time 2h, final forging temperature 900℃) to obtain plate.

[0047] Step S3: Mix 10 parts modified cerium oxide, 5 parts modified graphene oxide-MOFs material and 30 parts deionized water evenly, sonicate for 1 hour, then add 40 parts waterborne epoxy resin, 8 parts curing agent, 0.1 parts leveling agent and 0.1 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0048] Step S4: After solution treatment (temperature 880℃, time 2h) and aging treatment (temperature 500-600℃, aging time 1h) on the plate, a corrosion-resistant coating is applied, and after drying and curing, a corrosion-resistant coating is formed to obtain a high-strength alloy steel plate.

[0049] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.15%, Si: 0.05%, Mn: 0.4%, Cr: 3.5%, Mo: 2.54%, Ni: 0.34%, Nb: 0.02%, Ti: 0.01%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0050] The preparation method of modified cerium oxide is as follows:

[0051] Step A: Disperse 10 parts of cerium oxide ultrasonically in a mixed solution of 150 parts of anhydrous ethanol and 30 parts of deionized water, add 20 parts of γ-aminopropyltriethoxysilane and mix well, react at 70°C for 3 hours, and after centrifugation, washing and drying, obtain aminated cerium oxide.

[0052] Step B: Mix 10 parts of aminated cerium oxide, 5 parts of paraformaldehyde and 120 parts of 1,4-dioxane evenly, add 15 parts of cashew phenol and 30 parts of 1,4-dioxane solution dropwise over 30 minutes, react at 80°C for 8 hours, and obtain the intermediate by rotary evaporation.

[0053] Step C: Mix 10 parts of the intermediate, 20 parts of 2-mercaptoethylamine, and 0.3 parts of 2-hydroxy-2-methylphenylacetone evenly, and irradiate under ultraviolet light (irradiation wavelength 360 nm, irradiation intensity 20 mW / cm²). 2 The reaction was carried out for 0.5 h to obtain modified cerium oxide;

[0054] The preparation method of modified graphene oxide-MOFs materials is as follows:

[0055] Step (1): 5 parts of graphene oxide were ultrasonically dispersed in deionized water to form a 2 g / L dispersion. The pH of the system was adjusted to 10 using 0.1 mol / L potassium hydroxide solution. 6 parts of L-cysteine ​​were added and reacted at 85°C for 8 h. After centrifugation, washing and drying, modified graphene oxide was obtained.

[0056] Step (2): Mix 5 parts of modified graphene oxide and 500 parts of methanol evenly, add 50 parts of anhydrous cobalt acetate, and dropwise add a mixed solution of 110 parts of 2-methylimidazole and 440 parts of methanol. The mixture is added over 1 hour. After stirring for 20 minutes, let it stand for 22 hours. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0057] Example 2: A processing technology for high-strength alloy steel plates, comprising the following processes:

[0058] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1560℃) and cast to obtain steel ingots;

[0059] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1180℃, time 12h) and forging treatment (initial forging temperature 1220℃, holding time 3h, final forging temperature 910℃) to obtain plate.

[0060] Step S3: Mix 12 parts modified cerium oxide, 8 parts modified graphene oxide-MOFs material and 40 parts deionized water evenly, sonicate for 1.5 hours, then add 50 parts waterborne epoxy resin, 12 parts curing agent, 0.2 parts leveling agent and 0.2 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0061] Step S4: After solution treatment (temperature 900℃, time 4h) and aging treatment (temperature 550℃, aging time 3h) on the plate, a corrosion-resistant coating is applied. After drying and curing, a corrosion-resistant coating is formed, and a high-strength alloy steel plate is obtained.

[0062] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.20%, Si: 0.15%, Mn: 0.8%, Cr: 3.8%, Mo: 3.05%, Ni: 0.46%, Nb: 0.025%, Ti: 0.015%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0063] The preparation method of modified cerium oxide is as follows:

[0064] Step A: 12 parts of cerium oxide were ultrasonically dispersed in a mixed solution of 216 parts of anhydrous ethanol and 48 parts of deionized water. 36 parts of γ-aminopropyltriethoxysilane were added and mixed evenly. The mixture was reacted at 75°C for 4 hours. After centrifugation, washing and drying, aminated cerium oxide was obtained.

[0065] Step B: Mix 12 parts of aminated cerium oxide, 9.6 parts of paraformaldehyde and 156 parts of 1,4-dioxane evenly, add 38.4 parts of cashew phenol and 86.4 parts of 1,4-dioxane mixed solution dropwise over 40 minutes, react at 85°C for 9 hours, and obtain the intermediate by rotary evaporation.

[0066] Step C: Mix 12 parts of the intermediate, 36 parts of 2-mercaptoethylamine, and 0.48 parts of 2-hydroxy-2-methylphenylacetone evenly, and irradiate under ultraviolet light (irradiation wavelength 380 nm, irradiation intensity 30 mW / cm²). 2 The reaction proceeded for 1 hour to obtain modified cerium oxide.

[0067] The preparation method of modified graphene oxide-MOFs materials is as follows:

[0068] Step (1): 8 parts of graphene oxide were ultrasonically dispersed in deionized water to form a 2.5 g / L dispersion. The pH of the system was adjusted to 10.5 using 0.1 mol / L potassium hydroxide solution. 11.2 parts of L-cysteine ​​were added and reacted at 90℃ for 9 h. After centrifugation, washing and drying, modified graphene oxide was obtained.

[0069] Step (2): Mix 8 parts of modified graphene oxide and 1200 parts of methanol evenly, add 88 parts of anhydrous cobalt acetate, and add dropwise a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol. The addition is completed in 1.5 hours. After stirring for 30 minutes, let stand for 23 hours. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0070] Example 3: A processing technology for high-strength alloy steel plates, comprising the following processes:

[0071] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1580℃) and then cast to obtain steel ingots;

[0072] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1200℃, time 16h) and forging treatment (initial forging temperature 1250℃, holding time 4h, final forging temperature 920℃) to obtain plate.

[0073] Step S3: Mix 15 parts modified cerium oxide, 10 parts modified graphene oxide-MOFs material and 50 parts deionized water evenly, sonicate for 2 hours, then add 60 parts waterborne epoxy resin, 15 parts curing agent, 0.3 parts leveling agent and 0.3 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0074] Step S4: After solution treatment (temperature 1000℃, time 6h) and aging treatment (temperature 600℃, time 5h) on the plate, a corrosion-resistant coating is applied, and after drying and curing, a corrosion-resistant coating is formed to obtain a high-strength alloy steel plate.

[0075] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.30%, Si: 0.20%, Mn: 1.2%, Cr: 4.0%, Mo: 3.28%, Ni: 0.56%, Nb: 0.03%, Ti: 0.02%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0076] The preparation method of modified cerium oxide is as follows:

[0077] Step A: Disperse 15 parts of cerium oxide ultrasonically in a mixed solution of 300 parts of anhydrous ethanol and 75 parts of deionized water, add 60 parts of γ-aminopropyltriethoxysilane and mix well, react at 80°C for 5 hours, and after centrifugation, washing and drying, obtain aminated cerium oxide.

[0078] Step B: Mix 15 parts of aminated cerium oxide, 15 parts of paraformaldehyde and 225 parts of 1,4-dioxane evenly, add 75 parts of cashew phenol and 300 parts of 1,4-dioxane mixed solution dropwise over 50 minutes, react at 90°C for 10 hours, and obtain the intermediate by rotary evaporation.

[0079] Step C: Mix 15 parts of the intermediate, 60 parts of 2-mercaptoethylamine, and 0.75 parts of 2-hydroxy-2-methylphenylacetone evenly, and irradiate under ultraviolet light (irradiation wavelength 400 nm, irradiation intensity 35 mW / cm²). 2 The reaction was carried out for 2.0 h to obtain modified cerium oxide;

[0080] The preparation method of modified graphene oxide-MOFs materials is as follows:

[0081] Step (1): 10 parts of graphene oxide were ultrasonically dispersed in deionized water to form a 3 g / L dispersion. The pH of the system was adjusted to 11 using 0.1 mol / L potassium hydroxide solution. 15 parts of L-cysteine ​​were added and reacted at 95°C for 10 h. After centrifugation, washing and drying, modified graphene oxide was obtained.

[0082] Step (2): Mix 10 parts of modified graphene oxide and 2000 parts of methanol evenly, add 120 parts of anhydrous cobalt acetate, and dropwise add a mixed solution of 300 parts of 2-methylimidazole and 1500 parts of methanol. The addition is completed in 2 hours. After stirring for 40 minutes, let stand for 24 hours. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0083] Comparative Example 1: A processing technology for a high-strength alloy steel sheet, comprising the following processes:

[0084] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1560℃) and cast to obtain steel ingots;

[0085] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1180℃, time 12h) and forging treatment (initial forging temperature 1220℃, holding time 3h, final forging temperature 910℃) to obtain plate.

[0086] Step S3: Mix 12 parts cerium oxide, 8 parts modified graphene oxide-MOFs material and 40 parts deionized water evenly, sonicate for 1.5 hours, then add 50 parts waterborne epoxy resin, 12 parts curing agent, 0.2 parts leveling agent and 0.2 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0087] Step S4: After solution treatment (temperature 900℃, time 4h) and aging treatment (temperature 550℃, aging time 3h) on the plate, a corrosion-resistant coating is applied. After drying and curing, a corrosion-resistant coating is formed, and a high-strength alloy steel plate is obtained.

[0088] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.20%, Si: 0.15%, Mn: 0.8%, Cr: 3.8%, Mo: 3.05%, Ni: 0.46%, Nb: 0.025%, Ti: 0.015%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0089] The preparation method of modified graphene oxide-MOFs materials is as follows:

[0090] Step (1): 8 parts of graphene oxide were ultrasonically dispersed in deionized water to form a 2.5 g / L dispersion. The pH of the system was adjusted to 10.5 using 0.1 mol / L potassium hydroxide solution. 11.2 parts of L-cysteine ​​were added and reacted at 90℃ for 9 h. After centrifugation, washing and drying, modified graphene oxide was obtained.

[0091] Step (2): Mix 8 parts of modified graphene oxide and 1200 parts of methanol evenly, add 88 parts of anhydrous cobalt acetate, and dropwise add a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol. The addition is completed in 1.5h. After stirring for 30min, let stand for 23h. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0092] Compared with Example 2, Comparative Example 1 replaced the modified cerium oxide with the same mass of cerium oxide, and the other steps were the same as in Example 2.

[0093] Comparative Example 2: A processing technology for a high-strength alloy steel plate, comprising the following processes:

[0094] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1560℃) and cast to obtain steel ingots;

[0095] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1180℃, time 12h) and forging treatment (initial forging temperature 1220℃, holding time 3h, final forging temperature 910℃) to obtain plate.

[0096] Step S3: Mix 12 parts modified cerium oxide, 8 parts graphene oxide and 40 parts deionized water evenly, sonicate for 1.5 hours, then add 50 parts waterborne epoxy resin, 12 parts curing agent, 0.2 parts leveling agent and 0.2 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0097] Step S4: After solution treatment (temperature 900℃, time 4h) and aging treatment (temperature 550℃, aging time 3h) on the plate, a corrosion-resistant coating is applied. After drying and curing, a corrosion-resistant coating is formed, and a high-strength alloy steel plate is obtained.

[0098] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.20%, Si: 0.15%, Mn: 0.8%, Cr: 3.8%, Mo: 3.05%, Ni: 0.46%, Nb: 0.025%, Ti: 0.015%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0099] The preparation method of modified cerium oxide is as follows:

[0100] Step A: 12 parts of cerium oxide were ultrasonically dispersed in a mixed solution of 216 parts of anhydrous ethanol and 48 parts of deionized water. 36 parts of γ-aminopropyltriethoxysilane were added and mixed evenly. The mixture was reacted at 75°C for 4 hours. After centrifugation, washing and drying, aminated cerium oxide was obtained.

[0101] Step B: Mix 12 parts of aminated cerium oxide, 9.6 parts of paraformaldehyde and 156 parts of 1,4-dioxane evenly, add 38.4 parts of cashew phenol and 86.4 parts of 1,4-dioxane mixed solution dropwise over 40 minutes, react at 85°C for 9 hours, and obtain the intermediate by rotary evaporation.

[0102] Step C: Mix 12 parts of the intermediate, 36 parts of 2-mercaptoethylamine, and 0.48 parts of 2-hydroxy-2-methylphenylacetone evenly, and irradiate under ultraviolet light (irradiation wavelength 380 nm, irradiation intensity 30 mW / cm²). 2 The reaction proceeded for 1 hour to obtain modified cerium oxide.

[0103] Compared with Example 2, Comparative Example 2 replaced the modified graphene oxide-MOFs material with the same mass of graphene oxide, and the other steps were the same as in Example 2.

[0104] Comparative Example 3: A processing technology for a high-strength alloy steel sheet, comprising the following processes:

[0105] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature 1560℃) and cast to obtain steel ingots;

[0106] Step S2: The steel ingot is subjected to homogenization treatment (temperature 1180℃, time 12h) and forging treatment (initial forging temperature 1220℃, holding time 3h, final forging temperature 910℃) to obtain plate.

[0107] Step S3: Mix 8 parts of modified graphene oxide-MOFs material and 40 parts of deionized water evenly, sonicate for 1.5 hours, then add 50 parts of waterborne epoxy resin, 12 parts of curing agent, 0.2 parts of leveling agent and 0.2 parts of defoamer and mix evenly to obtain corrosion-resistant coating.

[0108] Step S4: After solution treatment (temperature 900℃, time 4h) and aging treatment (temperature 550℃, aging time 3h) on the plate, a corrosion-resistant coating is applied. After drying and curing, a corrosion-resistant coating is formed, and a high-strength alloy steel plate is obtained.

[0109] The chemical composition of the raw material, by mass percentage, is as follows: C: 0.20%, Si: 0.15%, Mn: 0.8%, Cr: 3.8%, Mo: 3.05%, Ni: 0.46%, Nb: 0.025%, Ti: 0.015%, P≤0.02%, S≤0.01%, N≤0.004%, with the balance being Fe;

[0110] The preparation method of modified graphene oxide-MOFs materials is as follows:

[0111] Step (1): 8 parts of graphene oxide were ultrasonically dispersed in deionized water to form a 2.5 g / L dispersion. The pH of the system was adjusted to 10.5 using 0.1 mol / L potassium hydroxide solution. 11.2 parts of L-cysteine ​​were added and reacted at 90℃ for 9 h. After centrifugation, washing and drying, modified graphene oxide was obtained.

[0112] Step (2): Mix 8 parts of modified graphene oxide and 1200 parts of methanol evenly, add 88 parts of anhydrous cobalt acetate, and dropwise add a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol. The addition is completed in 1.5h. After stirring for 30min, let stand for 23h. After washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

[0113] Compared with Example 2, Comparative Example 3 did not add modified cerium oxide, and the other steps were the same as in Example 2.

[0114] Experiment: High-strength alloy steel plates obtained in Examples 1-3 and Comparative Examples 1-3 were used to prepare samples. Their properties were tested and the test results were recorded.

[0115] Tensile strength test: The tensile strength was determined using an electronic universal testing machine according to the standard GB / T 228.1-2021, with a tensile speed of 1 mm / min.

[0116] Adhesion test: Adhesion was tested using a cross-cut adhesion tester according to GB / T 9286-2021 and rated. Grade 0: The cut edges are completely smooth and there is no peeling within the grid. Grade 1: There is a small amount of coating peeling at the cut intersections, but the affected cross-cut area is no more than 5%. Grade 2: There is coating peeling at the cut intersections and / or along the cut edges, and the affected cross-cut area is greater than 5% but not more than 15%.

[0117] Neutral salt spray test: Corrosion resistance is determined according to GB / T 10125-2021 standard. Test procedure: The test is carried out on QY-90A salt spray tester. The salt spray is NaCl solution with a mass fraction of 5% and a pH of 6-7. The test temperature is 35℃. Record the salt spray resistance time.

[0118] The test results are as follows:

[0119] Tensile strength / MPa Adhesion / Grade Salt spray resistance time / h Example 1 1066 0 ≥960 Example 2 1085 0 ≥960 Example 3 1078 0 ≥960 Comparative Example 1 1062 1 816 Comparative Example 2 1057 1 840 Comparative Example 3 1050 2 ≤720

[0120] Based on the data in the table above, the following conclusions can be clearly drawn:

[0121] 1. Compared with Examples 1-3, the adhesion and salt spray resistance time of the products obtained in Comparative Examples 1 and 2 both decreased, indicating that the modified cerium oxide prepared in this invention has better compatibility and corrosion resistance than carbon black; compared with graphene oxide, the modified graphene oxide-MOFs material prepared in this invention has a better modification effect, thereby improving the corrosion resistance of the material.

[0122] 2. Compared with Examples 1-3, the adhesion and salt spray resistance time of the product obtained in Comparative Example 3 both decreased, indicating that the addition of modified cerium oxide to the corrosion-resistant coating prepared by the present invention is beneficial to improving the overall performance and corrosion resistance of the coating.

[0123] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A process for working a high-strength alloy steel sheet material, characterized in that: The method comprises the following steps: Step S1: raw materials are smelted by a vacuum induction furnace and cast to obtain a steel ingot; Step S2: the steel ingot is subjected to homogenization treatment and forging treatment to obtain a plate; Step S3: modified cerium oxide, modified graphene oxide-MOFs material and deionized water are uniformly mixed, ultrasonic treatment is carried out for 1-2 hours, then water-based epoxy resin, curing agent, leveling agent and defoaming agent are added and uniformly mixed to obtain a corrosion-resistant coating; Step S4: after the plate is subjected to solid solution treatment and aging treatment, the corrosion-resistant coating is coated, and after drying and curing, a corrosion-resistant coating layer is formed to obtain a high-strength alloy steel plate; In the step S1, the chemical composition of the raw material is as follows: C: 0.15-0.30%, Si: 0.05-0.20%, Mn: 0.4-1.2%, Cr: 3.5-4.0%, Mo: 2.54-3.28%, Ni: 0.34-0.56%, Nb: 0.02-0.03%, Ti: 0.01-0.02%, P≤0.02%, S≤0.01%, N≤0.004%, and the balance is Fe; The preparation method of the modified cerium oxide is as follows: Step A: cerium oxide is ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, γ-aminopropyltriethoxysilane is added and uniformly mixed, and reaction is carried out at 70-80°C for 3-5 hours, after centrifugation, washing and drying, amino cerium oxide is obtained; Step B: the amino cerium oxide, paraformaldehyde and 1,4-dioxane are uniformly mixed, a mixed solution of cardanol and 1,4-dioxane is added dropwise, and the dropwise addition is completed in 30-50 minutes, and reaction is carried out at 80-90°C for 8-10 hours, and the intermediate is obtained by rotary evaporation; Step C: the intermediate, 2-mercaptoethylamine and a photoinitiator are uniformly mixed, and reaction is carried out under ultraviolet light irradiation for 0.5-2.0 hours to obtain modified cerium oxide; The preparation method of the modified graphene oxide-MOFs material is as follows: Step (1): graphene oxide is ultrasonically dispersed in deionized water to form a dispersion liquid, potassium hydroxide solution is used to adjust the pH of the system to 10-11, L-cysteine is added, and reaction is carried out at 85-95°C for 8-10 hours, after centrifugal separation, washing and drying, modified graphene oxide is obtained; Step (2): the modified graphene oxide and methanol are uniformly mixed, anhydrous cobalt acetate is added, a mixed solution of 2-methylimidazole and methanol is added dropwise, the dropwise addition is completed in 1-2 hours, stirring is carried out for 20-40 minutes, and then standing is carried out for 22-24 hours, after washing, filtering and drying, the modified graphene oxide-MOFs material is obtained.

2. The process for processing high strength alloy steel sheet material as claimed in claim 1, wherein: In the step S1, the temperature of vacuum induction smelting is 1550-1580°C.

3. The process for processing high strength alloy steel sheet material as claimed in claim 1, wherein: In the step S2, the homogenization treatment temperature is 1160-1200°C, and the homogenization treatment time is 8-16 hours.

4. The process for working a high-strength alloy steel sheet according to claim 1, characterized in that: The corrosion-resistant coating in step S3 is composed of the following components by weight: 40-60 parts of water-based epoxy resin, 10-15 parts of modified cerium oxide, 5-10 parts of modified graphene oxide-MOFs material, 30-50 parts of deionized water, 8-15 parts of curing agent, 0.1-0.3 parts of leveling agent, and 0.1-0.3 parts of defoaming agent.

5. The process for working a high-strength alloy steel sheet according to claim 1, characterized in that: In step A, the mass ratio of cerium oxide, anhydrous ethanol, deionized water and γ-aminopropyl triethoxysilane is 1: (15-20): (3-5): (2-4).

6. The process for working a high-strength alloy steel sheet according to claim 1, characterized in that: In step C, the mass ratio of intermediate, 2-mercaptoethylamine and photoinitiator is 1: (2-4): (0.03-0.05).

7. The process for working a high-strength alloy steel sheet according to claim 1, characterized in that: In step (1), the mass of L-cysteine is 1.2-1.5 times the mass of graphene oxide.

8. A high-strength alloy steel plate material prepared by the processing process according to any one of claims 1-7.