High-strength alloy steel plate and processing technology thereof

Abstract

The invention relates to the technical field of alloy steel, in particular to a high-strength alloy steel plate and a machining process thereof. The method comprises the steps that S1, raw materials are smelted through a vacuum induction furnace and cast, and a steel ingot is obtained; s2, the steel ingot is subjected to homogenization treatment and forging treatment, and a plate is obtained; s3, uniformly mixing the modified cerium oxide, the modified graphene oxide-MOFs material and deionized water, performing ultrasonic treatment for 1-2 hours, then adding waterborne epoxy resin, a curing agent, a flatting agent and a defoaming agent, and uniformly mixing to obtain a corrosion-resistant coating; and S4, after the plate is subjected to solution treatment and aging treatment, the plate is coated with a corrosion-resistant coating, and after drying and curing are conducted, a corrosion-resistant coating is formed, and the high-strength alloy steel plate is obtained. The prepared high-strength alloy steel plate has excellent corrosion resistance and adhesive force, so that the service life of the high-strength alloy steel plate is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy steel, and specifically to a high-strength alloy steel plate and its processing technology. Background Art

[0002] With the development of industry and manufacturing, the performance requirements for materials are constantly increasing. High-strength alloy steel plates are widely used in fields such as aviation, automotive, shipbuilding, and construction due to their excellent mechanical properties and corrosion resistance. Such materials are usually processed by means of alloying, heat treatment, and cold working to improve their strength and toughness, so as to meet the requirements of specific applications.

[0003] However, traditional high-strength alloy steel plates are prone to oxidation and corrosion in humid or corrosive environments, especially in the marine or chemical industry fields, which limits their service life. In addition, existing surface treatment technologies, such as spraying or galvanizing, although can improve corrosion resistance to a certain extent, the protective layer is often prone to peeling or damage, thus exposing the steel to the corrosive environment; under different environmental conditions such as extreme temperature and humidity changes, their corrosion resistance performance is unstable and difficult to meet the requirements of some special application scenarios.

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

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

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A processing technology for a high-strength alloy steel plate, comprising the following steps:

[0008] Step S1: Smelt the raw materials using a vacuum induction furnace and perform casting to obtain an ingot;

[0009] Step S2: Perform homogenization treatment and forging treatment on the ingot to obtain a plate;

[0010] Step S3: Mix modified cerium oxide, modified graphene-MOFs material, and deionized water evenly, perform ultrasonic treatment for 1 - 2 h, then add water-based epoxy resin, curing agent, leveling agent, and defoaming agent and mix evenly to obtain a corrosion-resistant coating;

[0011] Step S4: After performing solution treatment and aging treatment on the plate, coat the corrosion-resistant coating, and after drying and curing, form a corrosion-resistant coating to obtain a high-strength alloy steel plate.

[0012] Further, in the step S1, the temperature of the vacuum induction melting is 1550 - 1580 °C.

[0013] Further, in the step S2, the homogenization treatment temperature is 1160 - 1200 °C, and the homogenization treatment time is 8 - 16 h.

[0014] Further, in the step S2, the process conditions for forging treatment are: the initial forging temperature is 1200 - 1250 °C, the heat preservation time is 2 - 4 h, and the final forging temperature is 900 - 920 °C.

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

[0016] Further, in the step S1, the chemical composition of the raw material is by mass percentage: 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.

[0017] Further, the corrosion - resistant coating is composed of the following components in parts by weight: 40 - 60 parts of water - borne 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 part of leveling agent, and 0.1 - 0.3 part of defoaming agent.

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

[0019] Step A: Ultrasonically disperse cerium oxide in a mixed solution of absolute ethanol and deionized water, add γ - aminopropyltriethoxysilane and mix evenly, react at 70 - 80 °C for 3 - 5 h, and after centrifugation, washing, and drying, obtain amino - functionalized cerium oxide;

[0020] Step B: Mix the amino - functionalized cerium oxide, paraformaldehyde, and 1,4 - dioxane evenly, dropwise add a mixed solution of cardanol and 1,4 - dioxane, finish dropping in 30 - 50 min, react at 80 - 90 °C for 8 - 10 h, and after rotary evaporation, obtain an intermediate;

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

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

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

[0024] Further, in the step B, the mass of cardanol is 3 - 5 times the mass of paraformaldehyde.

[0025] Further, in the step B, the mass ratio of cardanol and 1,4-dioxane is 1:(2 - 4).

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

[0027] Further, the photoinitiator is 2-hydroxy-2-methylpropiophenone.

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

[0029] In the above technical solution, γ-aminopropyltriethoxysilane is used to modify the surface of cerium oxide, introducing amino groups to obtain amino-functionalized cerium oxide, improving its dispersibility and compatibility; and the Mannich reaction is carried out between cardanol, paraformaldehyde and the amino groups in the amino-functionalized cerium oxide to introduce benzoxazine structure and double bonds to prepare the intermediate, which helps to improve the thermal stability and anti-corrosion performance of the epoxy resin; however, the molecular double bonds on the intermediate chain are very unstable and the anti-corrosion performance is very poor, and the coating is prone to color change under the condition of long-term light irradiation. Therefore, the present application further introduces 2-mercaptoethylamine, and the thiol group of 2-mercaptoethylamine undergoes a thiol-ene click reaction with the double bond to introduce amino groups, thereby improving its compatibility and binding force and improving the anti-corrosion performance and durability of the coating.

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

[0031] Step (1): Ultrasonically disperse graphene oxide in deionized water to form a dispersion, adjust the pH of the system to 10 - 11 with a potassium hydroxide solution, add L-cysteine, react at 85 - 95 °C for 8 - 10 h, and after centrifugal separation, washing and drying, obtain modified graphene oxide;

[0032] Step (2): Mix the modified graphene oxide and methanol evenly, add anhydrous cobalt acetate, and dropwise add the mixed solution of 2-methylimidazole and methanol, which is added dropwise within 1 - 2 h. After stirring for 20 - 40 min, let it stand for 22 - 24 h. After washing, filtering, and drying, the modified graphene oxide-MOFs material is obtained.

[0033] In the above technical solution, the graphene oxide is modified by L-cysteine to achieve the mercapto-functionalization of graphene oxide, and the modified graphene oxide is obtained. There is a Lewis acid-base interaction between the mercapto group and heavy metal ions, which has a strong affinity; MOFs are a new type of organic-inorganic hybrid porous nanoparticles, and ZIF-67 is a highly regular porous nano-filler formed by the coordination of Co 2+ with 2-methylimidazole (2-IM). The Co in ZIF-67 2+ and the ligand 2-methylimidazole are effective corrosion inhibitors for metals, which can significantly improve the active anti-corrosion performance of the organic coating; the ZIF-67 nanoparticles interact with the carboxyl, mercapto, and hydroxyl groups on the surface of the modified graphene oxide to obtain the modified graphene oxide-MOFs material. 2+ and the carboxyl, mercapto, and hydroxyl groups on the surface of the modified graphene oxide to obtain the modified graphene oxide-MOFs material.

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

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

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

[0037] Further, in the 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] Further, 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] For a high-strength alloy steel plate and its processing technology of the present invention, the modified cerium oxide and the modified graphene oxide-MOFs material are used as corrosion-resistant fillers, and are ultrasonically dispersed in deionized water. With the combined action of water-based epoxy resin and various additives, a highly efficient corrosion-resistant coating is prepared; the modified cerium oxide and the modified graphene oxide-MOFs material play a synergistic role, jointly improving the corrosion resistance, adhesion, and mechanical strength of the coating, thereby significantly extending the service life and application effect of the coating. Detailed implementation manners

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In this embodiment, the waterborne epoxy resin: the brand is Dow DER-916 of the United States; cerium oxide: the particle size is 10-20 μm, sourced from Shanghai Yaotian New Materials Technology Co., Ltd.; graphene oxide: the model is DN-20DY, the average thickness is 1-3 nm, the diameter is 4-7 μm, and the number of layers is 2-5 layers, sourced from Zhejiang Zhitaina Micro New Materials Co., Ltd.; leveling agent: the model is Keying KYC-615; defoaming agent: the model is BYK-028 of BYK; curing agent: polyamide 650, sourced from Jinan Lansheng New Materials Co., Ltd.

[0043] In the following examples and comparative examples, 1 part is equal to 10 g.

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

[0045] Step S1: The raw materials are smelted in a vacuum induction furnace (temperature is 1550 °C) and cast to obtain an ingot.

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

[0047] Step S3: 10 parts of modified cerium oxide, 5 parts of modified graphene oxide-MOFs material and 30 parts of deionized water are mixed evenly, ultrasonically treated for 1 h, and then 40 parts of waterborne epoxy resin, 8 parts of curing agent, 0.1 part of leveling agent and 0.1 part of defoaming agent are added and mixed evenly to obtain a corrosion-resistant coating.

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

[0049] The chemical composition of the raw material is by mass percentage: 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%, and the balance is Fe;

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

[0051] Step A: Ultrasonically disperse 10 parts of cerium oxide in a mixed solution of 150 parts of absolute ethanol and 30 parts of deionized water, add 20 parts of γ-aminopropyltriethoxysilane and mix evenly. React at 70 °C for 3 h, and after centrifugation, washing, and drying, obtain amino-functionalized cerium oxide;

[0052] Step B: Mix 10 parts of amino-functionalized cerium oxide, 5 parts of paraformaldehyde, and 120 parts of 1,4-dioxane evenly, dropwise add a mixed solution of 15 parts of cardanol and 30 parts of 1,4-dioxane, finish dropping in 30 min, and react at 80 °C for 8 h. After rotary evaporation, obtain an intermediate;

[0053] Step C: Mix 10 parts of the intermediate, 20 parts of 2-mercaptoethylamine, and 0.3 part of 2-hydroxy-2-methylpropiophenone evenly, and under ultraviolet light irradiation (irradiation wavelength 360 nm, irradiation intensity 20 mW / cm 2 ), react for 0.5 h to obtain the modified cerium oxide;

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

[0055] Step (1): Ultrasonically disperse 5 parts of graphene oxide in deionized water to form a 2 g / L dispersion. Use 0.1 mol / L potassium hydroxide solution to adjust the system pH = 10, add 6 parts of L-cysteine, and react at 85 °C for 8 h. After centrifugal separation, washing, and drying, obtain modified graphene oxide;

[0056] Step (2): Mix 5 parts of the modified graphene oxide and 500 parts of methanol evenly, add 50 parts of anhydrous cobalt acetate, dropwise add a mixed solution of 110 parts of 2-methylimidazole and 440 parts of methanol, finish dropping in 1 h, stir for 20 min, and then stand for 22 h. After washing, filtering, and drying, obtain the modified graphene oxide-MOFs material.

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

[0058] Step S1: Smelt the raw material in a vacuum induction furnace (temperature is 1560 °C) and carry out casting to obtain an ingot;

[0059] Step S2: Homogenize the ingot (at a temperature of 1180 °C for 12 h) and forge it (starting forging temperature 1220 °C, holding time 3 h, final forging temperature 910 °C) to obtain a sheet;

[0060] Step S3: Mix 12 parts of modified cerium oxide, 8 parts of modified graphene oxide-MOFs material and 40 parts of deionized water evenly, perform ultrasonic treatment for 1.5 h, then add 50 parts of waterborne epoxy resin, 12 parts of curing agent, 0.2 part of leveling agent and 0.2 part of defoaming agent and mix evenly to obtain a corrosion-resistant coating;

[0061] Step S4: After solution treatment (at a temperature of 900 °C for 4 h) and aging treatment (at a temperature of 550 °C for 3 h) of the sheet, apply the corrosion-resistant coating, and after drying and curing, form a corrosion-resistant coating to obtain a high-strength alloy steel sheet;

[0062] The chemical composition of the raw materials is by mass percentage: 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%, and the balance is Fe;

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

[0064] Step A: Ultrasonically disperse 12 parts of cerium oxide in a mixed solution of 216 parts of absolute ethanol and 48 parts of deionized water, add 36 parts of γ-aminopropyltriethoxysilane and mix evenly, react at 75 °C for 4 h, and after centrifugation, washing and drying, obtain amino-functionalized cerium oxide;

[0065] Step B: Mix 12 parts of amino-functionalized cerium oxide, 9.6 parts of paraformaldehyde and 156 parts of 1,4-dioxane evenly, dropwise add a mixed solution of 38.4 parts of cardanol and 86.4 parts of 1,4-dioxane, finish dropping in 40 min, react at 85 °C for 9 h, and after rotary evaporation, obtain an intermediate;

[0066] Step C: Mix 12 parts of the intermediate, 36 parts of 2-mercaptoethylamine and 0.48 part of 2-hydroxy-2-methylpropiophenone evenly, and under ultraviolet light irradiation (irradiation wavelength 380 nm, irradiation intensity 30 mW / cm 2 )), react for 1 h to obtain the modified cerium oxide;

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

[0068] Step (1): Ultrasonically disperse 8 parts of graphene oxide in deionized water to form a 2.5 g / L dispersion. Adjust the pH of the system to 10.5 using 0.1 mol / L potassium hydroxide solution. Add 11.2 parts of L-cysteine and react at 90 °C for 9 h. After centrifugal separation, washing, and drying, modified graphene oxide is 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 dropwise add a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol. Finish dropping in 1.5 h, stir for 30 min, and then let it stand for 23 h. After washing, filtering, and drying, a modified graphene oxide-MOFs material is obtained.

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

[0071] Step S1: Smelt the raw materials in a vacuum induction furnace (temperature is 1580 °C) and carry out casting to obtain an ingot.

[0072] Step S2: Perform homogenization treatment (temperature is 1200 °C, time is 16 h) and forging treatment (initial forging temperature 1250 °C, holding time 4 h, final forging temperature 920 °C) on the ingot to obtain a plate.

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

[0074] Step S4: After performing solution treatment (temperature is 1000 °C, time is 6 h) and aging treatment (temperature is 600 °C, time is 5 h) on the plate, coat the corrosion-resistant coating, 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 materials is calculated by mass percentage 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%, and the balance is Fe.

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

[0077] Step A: Ultrasonically disperse 15 parts of cerium oxide in a mixed solution of 300 parts of absolute ethanol and 75 parts of deionized water. Add 60 parts of γ-aminopropyltriethoxysilane and mix evenly. React at 80 °C for 5 h. After centrifugation, washing, and drying, amino-functionalized cerium oxide is obtained;

[0078] Step B: Mix 15 parts of amino-functionalized cerium oxide, 15 parts of paraformaldehyde, and 225 parts of 1,4-dioxane evenly. Dropwise add a mixed solution of 75 parts of cardanol and 300 parts of 1,4-dioxane. Finish dropping in 50 min. React at 90 °C for 10 h. After rotary evaporation, an intermediate is obtained;

[0079] Step C: Mix 15 parts of the intermediate, 60 parts of 2-mercaptoethylamine, and 0.75 parts of 2-hydroxy-2-methylpropiophenone evenly. Under ultraviolet light irradiation (irradiation wavelength 400 nm, irradiation intensity 35 mW / cm 2 ), react for 2.0 h to obtain modified cerium oxide;

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

[0081] Step (1): Ultrasonically disperse 10 parts of graphene oxide in deionized water to form a 3 g / L dispersion. Use 0.1 mol / L potassium hydroxide solution to adjust the system pH = 11. Add 15 parts of L-cysteine. React at 95 °C for 10 h. After centrifugal separation, washing, and drying, modified graphene oxide is obtained;

[0082] Step (2): Mix 10 parts of modified graphene oxide and 2000 parts of methanol evenly. Add 120 parts of anhydrous cobalt acetate. Dropwise add a mixed solution of 300 parts of 2-methylimidazole and 1500 parts of methanol. Finish dropping in 2 h. Stir for 40 min and then stand for 24 h. After washing, filtering, and drying, the modified graphene oxide-MOFs material is obtained.

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

[0084] Step S1: Smelt the raw materials in a vacuum induction furnace (temperature 1560 °C) and perform casting to obtain an ingot;

[0085] Step S2: Perform homogenization treatment (temperature 1180 °C, time 12 h) and forging treatment (initial forging temperature 1220 °C, holding time 3 h, final forging temperature 910 °C) on the ingot to obtain a steel plate;

[0086] Step S3: Mix 12 parts of cerium oxide, 8 parts of modified graphene oxide-MOFs material and 40 parts of deionized water evenly, ultrasonically treat for 1.5 h, then add 50 parts of waterborne epoxy resin, 12 parts of curing agent, 0.2 part of leveling agent and 0.2 part of defoaming agent and mix evenly to obtain a corrosion-resistant coating;

[0087] Step S4: After solution treatment (temperature 900 °C, time 4 h) and aging treatment (temperature 550 °C, aging treatment time 3 h) of the sheet, apply the corrosion-resistant coating, and after drying and curing, form a corrosion-resistant coating to obtain a high-strength alloy steel sheet;

[0088] The chemical composition of the raw materials is by mass percentage: 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%, and the balance is Fe;

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

[0090] Step (1): Ultrasonically disperse 8 parts of graphene oxide in deionized water to form a 2.5 g / L dispersion, adjust the pH of the system to 10.5 with 0.1 mol / L potassium hydroxide solution, add 11.2 parts of L-cysteine, react at 90 °C for 9 h, and after centrifugal separation, washing and drying, obtain modified graphene oxide;

[0091] Step (2): Mix 8 parts of modified graphene oxide and 1200 parts of methanol evenly, add 88 parts of anhydrous cobalt acetate, dropwise add a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol, finish dropping in 1.5 h, stir for 30 min and then stand for 23 h, and after washing, filtering and drying, obtain the modified graphene oxide-MOFs material;

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

[0093] Comparative Example 2: A processing process for high-strength alloy steel sheets, including the following processes:

[0094] Step S1: Smelt the raw materials in a vacuum induction furnace (temperature 1560 °C) and carry out casting to obtain an ingot;

[0095] Step S2: Carry out homogenization treatment (temperature 1180 °C, time 12 h) and forging treatment (initial forging temperature 1220 °C, holding time 3 h, final forging temperature 910 °C) on the ingot to obtain a sheet;

[0096] Step S3: Mix 12 parts of modified cerium oxide, 8 parts of graphene oxide, and 40 parts of deionized water evenly, perform ultrasonic treatment for 1.5 h, then add 50 parts of waterborne epoxy resin, 12 parts of curing agent, 0.2 part of leveling agent, and 0.2 part of defoaming agent and mix evenly to obtain a corrosion-resistant coating;

[0097] Step S4: After subjecting the sheet to solution treatment (temperature: 900 °C, time: 4 h) and aging treatment (temperature: 550 °C, aging treatment time: 3 h), apply the corrosion-resistant coating, and after drying and curing, form a corrosion-resistant coating layer to obtain a high-strength alloy steel sheet;

[0098] The chemical composition of the raw materials is by mass percentage: 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%, and the balance is Fe;

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

[0100] Step A: Ultrasonically disperse 12 parts of cerium oxide in a mixed solution of 216 parts of absolute ethanol and 48 parts of deionized water, add 36 parts of γ-aminopropyltriethoxysilane and mix evenly, react at 75 °C for 4 h, and after centrifugation, washing, and drying, obtain amino-functionalized cerium oxide;

[0101] Step B: Mix 12 parts of amino-functionalized cerium oxide, 9.6 parts of paraformaldehyde, and 156 parts of 1,4-dioxane evenly, dropwise add a mixed solution of 38.4 parts of cardanol and 86.4 parts of 1,4-dioxane, finish dropping in 40 min, react at 85 °C for 9 h, and after rotary evaporation, obtain an intermediate;

[0102] Step C: Mix 12 parts of the intermediate, 36 parts of 2-mercaptoethylamine, and 0.48 part of 2-hydroxy-2-methylpropiophenone evenly, and under ultraviolet light irradiation (irradiation wavelength 380 nm, irradiation intensity 30 mW / cm 2 ), react for 1 h to obtain modified cerium oxide;

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

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

[0105] Step S1: Smelt the raw materials using a vacuum induction furnace (temperature: 1560 °C) and perform casting to obtain an ingot;

[0106] Step S2: Homogenize the ingot (at a temperature of 1180 °C for 12 h) and forge it (start forging temperature 1220 °C, holding time 3 h, final forging temperature 910 °C) to obtain a sheet;

[0107] Step S3: Mix 8 parts of the modified graphene oxide-MOFs material and 40 parts of deionized water evenly, perform ultrasonic treatment for 1.5 h, then add 50 parts of waterborne epoxy resin, 12 parts of curing agent, 0.2 part of leveling agent and 0.2 part of defoaming agent and mix evenly to obtain a corrosion-resistant coating;

[0108] Step S4: After solution treatment (at a temperature of 900 °C for 4 h) and aging treatment (at a temperature of 550 °C for 3 h) of the sheet, apply the corrosion-resistant coating, and after drying and curing, form a corrosion-resistant coating to obtain a high-strength alloy steel sheet;

[0109] The chemical composition of the raw materials is calculated by mass percentage 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%, and the balance is Fe;

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

[0111] Step (1): Ultrasonically disperse 8 parts of graphene oxide in deionized water to form a 2.5 g / L dispersion, adjust the pH of the system to 10.5 with 0.1 mol / L potassium hydroxide solution, add 11.2 parts of L-cysteine, and react at 90 °C for 9 h. After centrifugal separation, washing and drying, obtain modified graphene oxide;

[0112] Step (2): Mix 8 parts of the modified graphene oxide and 1200 parts of methanol evenly, add 88 parts of anhydrous cobalt acetate, dropwise add a mixed solution of 200 parts of 2-methylimidazole and 900 parts of methanol, finish dropping in 1.5 h, stir for 30 min and then stand for 23 h. After washing, filtering and drying, obtain the modified graphene oxide-MOFs material;

[0113] Compared with Example 2, in Comparative Example 3, modified cerium oxide is not added, and other steps are the same as those in Example 2.

[0114] Experiment: Take the high-strength alloy steel sheets obtained in Examples 1-3 and Comparative Examples 1-3, prepare specimens, and detect and record the test results of their properties respectively:

[0115] Tensile strength test: According to the standard of GB / T 228.1-2021, use an electronic universal testing machine to determine the tensile strength, and the tensile speed is 1 mm / min.

[0116] Adhesion test: According to the standard of GB / T 9286-2021, a cross-cut tape test was used to determine the adhesion and rating. Grade 0: The cutting edges are completely smooth and there is no peeling within the grid; Grade 1: There is a little coating peeling at the intersection of the cuts, but the affected cross-cut area is not more than 5%; Grade 2: There is coating peeling at the intersection of the cuts and / or along the cutting edge, and the affected cross-cut area is greater than 5% but not more than 15%.

[0117] Neutral salt spray test: The corrosion resistance was determined according to the standard of GB / T 10125-2021. Experimental procedure: The test was carried out on a QY-90A salt spray test chamber. The salt spray was an NaCl solution with a mass fraction of 5%, a pH of 6 - 7, and a test temperature of 35°C. The salt spray resistance time was recorded.

[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] From the data in the above table, the following conclusions can be clearly obtained:

[0121] 1. Compared with Examples 1 - 3, the adhesion and salt spray resistance time of the products obtained in Comparative Example 1 and Comparative Example 2 decreased, indicating that the modified cerium oxide prepared by the present invention has better compatibility and corrosion resistance compared with carbon black; compared with graphene oxide, the modified graphene oxide-MOFs material prepared by the present 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 decreased, which indicates that adding 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] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A processing technology for high-strength alloy steel plate, characterized in that: The steps include: Step S1: smelting the raw materials in a vacuum induction furnace and casting to obtain a steel ingot; Step S2: homogenizing and forging the steel ingot to obtain a plate; Step S3: uniformly mixing the modified cerium oxide, the modified graphene oxide-MOFs material and deionized water, ultrasonically treating for 1-2 hours, and then adding a water-based epoxy resin, a curing agent, a leveling agent and a defoaming agent and mixing them to obtain a corrosion-resistant coating; Step S4: After the plate is subjected to solution treatment and aging treatment, a corrosion-resistant coating is coated, and after drying and curing, a corrosion-resistant coating is formed to obtain a high-strength alloy steel plate.

2. The processing technology of a high-strength alloy steel plate according to claim 1 is characterized in that: In step S1, the temperature of vacuum induction melting is 1550-1580°C.

3. The processing technology of a high-strength alloy steel plate according to claim 1 is characterized in that: In the step S2, the homogenization temperature is 1160-1200° C., and the homogenization time is 8-16 hours.

4. The processing technology of a high-strength alloy steel plate according to claim 1 is characterized in that: In step S3, 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 defoaming agent.

5. The processing technology of a high-strength alloy steel plate according to claim 4 is characterized in that: The preparation method of the modified cerium oxide is as follows: Step A: ultrasonically dispersing cerium oxide in a mixed solution of anhydrous ethanol and deionized water, adding γ-aminopropyltriethoxysilane and mixing evenly, reacting at 70-80° C. for 3-5 hours, and obtaining amino cerium oxide after centrifugation, washing and drying; Step B: Evenly mix the aminated cerium oxide, paraformaldehyde and 1,4-dioxane, dropwise add the mixed solution of cardanol and 1,4-dioxane, and complete the dropwise addition for 30-50 minutes. The mixture is reacted at 80-90° C. for 8-10 hours, and subjected to rotary evaporation to obtain an intermediate. Step C: uniformly mix the intermediate, 2-mercaptoethylamine and a photoinitiator, and react for 0.5-2.0 hours under ultraviolet light to obtain modified cerium oxide.

6. The processing technology of a high-strength alloy steel plate according to claim 5, characterized in that: In the step A, the mass ratio of cerium oxide, anhydrous ethanol, deionized water and γ-aminopropyltriethoxysilane is 1:(15-20):(3-5):(2-4).

7. The processing technology of a high-strength alloy steel plate according to claim 5, characterized in that: In the step C, the mass ratio of the intermediate, 2-mercaptoethylamine and the photoinitiator is 1:(2-4):(0.03-0.05).

8. The processing technology of a high-strength alloy steel plate according to claim 4, characterized in that: The modified graphene oxide-MOFs material preparation method is as follows: Step (1): ultrasonically dispersing graphene oxide in deionized water to form a dispersion, adjusting the system pH to 10-11 using a potassium hydroxide solution, adding L-cysteine, reacting at 85-95° C. for 8-10 h, centrifuging, washing, and drying to obtain modified graphene oxide; Step (2): uniformly mix the modified graphene oxide and methanol, add anhydrous cobalt acetate, and drip a mixed solution of 2-methylimidazole and methanol for 1-2 hours. Stir for 20-40 minutes and then stand for 22-24 hours. After washing, filtering and drying, a modified graphene oxide-MOFs material is obtained.

9. The processing technology of a high-strength alloy steel plate according to claim 8, characterized in that: In the step (1), the mass of L-cysteine ​​is 1.2-1.5 times the mass of graphene oxide.

10. A high-strength alloy steel plate obtained by the processing technology according to any one of claims 1 to 9.