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CN-121537872-B - High-strength high-toughness brass material and preparation method thereof

CN121537872BCN 121537872 BCN121537872 BCN 121537872BCN-121537872-B

Abstract

The invention relates to the technical field of brass materials, in particular to a high-strength high-toughness brass material and a preparation method thereof, wherein a porous oxide film layer is prefabricated on the surface of brass through plasma electrolytic oxidation, a double-bonded silver-loaded graphene oxide doped oxide film layer is constructed on the surface of brass, then a photo-curable hole sealing coating is prepared for hole sealing treatment, double-bonded silver-loaded graphene oxide and modified MXene are introduced into the photo-curable hole sealing coating as a filler, the MXene is thiolated by 3-mercaptopropyl triethoxysilane, and then a double-bond-containing bisbenzimidazole ring derivative is grafted through light clicking to obtain the modified MXene; vinyl-terminated polyurethane is used as a cross-linking agent, o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate and octadecyl acrylate are compounded to be used as acrylic monomers, a diluent and a solvent are introduced, a complex cross-linking network is constructed, and the service life of the brass material is prolonged.

Inventors

  • GAO PAN
  • LI XIAOHUA
  • GONG XIAODONG

Assignees

  • 陕西省军工（集团）陕铜有限责任公司

Dates

Publication Date
20260505
Application Date
20260115

Claims (8)

  1. 1. The preparation method of the high-strength high-toughness brass material is characterized by comprising the following steps of: S1, taking a brass rod as a base material, and sequentially carrying out frosting, polishing, cleaning and drying to obtain a brass base material; s2, transferring the brass base material into electrolyte, performing plasma electrolytic oxidation treatment, and drying to obtain a pretreated base material; s3, mixing vinyl terminated polyurethane, an acrylic ester monomer, a reactive diluent, double-bonded silver-loaded graphene oxide, modified MXene and a solvent, adding a photoinitiator, and carrying out ultrasonic stirring to obtain a hole sealing coating; S4, coating hole sealing paint on the surface of the pretreated substrate, and carrying out photo-curing treatment to obtain a high-strength high-toughness brass material; the mass ratio of the sum of the masses of the double-bonded silver-loaded graphene oxide and the modified MXene to the acrylic ester monomer is (0.1-0.15): 1; The preparation method of the double-bonded silver-loaded graphene oxide comprises the following steps: (1) Mixing silver nitrate and deionized water, adding ammonia water in a dark place to obtain silver ammonia solution, adding graphene oxide aqueous solution, stirring at 48-50 ℃ in a dark place for 20-30min, adding glucose aqueous solution, stirring for 20-30min, centrifugally washing, and drying to obtain silver-loaded graphene oxide; (2) Mixing silver-loaded graphene oxide and ethanol water solution, performing ultrasonic dispersion for 1-2h, adjusting the pH value to 4-5, adding the mixed solution of the ethanol water solution and KH-570, heating to 55-60 ℃, preserving heat for 11-12h, centrifuging, washing, and drying to obtain double-bonded silver-loaded graphene oxide; The preparation of the modified MXene comprises the following steps: 1) Mixing MXene and ethanol, ultrasonically stirring, adding triethylamine, heating to 38-42 ℃, stirring for 160-200min, adding a mixed solution of 3-mercaptopropyl triethoxysilane and deionized water, continuously stirring for 11-12h, centrifuging, washing, and vacuum freeze-drying to obtain sulfhydrylated MXene; 2) Under nitrogen atmosphere, mixing sulfhydrylation MXene and ethanol, stirring by ultrasonic, adding double bond-containing bisbenzimidazole ring derivative and photoinitiator, illuminating for 2-3h at 365nm, centrifuging, washing, drying and grinding to obtain modified MXene.
  2. 2. The preparation method of the high-strength high-toughness brass material according to claim 1, wherein the electrolyte is prepared from deionized water serving as a solvent and contains 8g/L sodium silicate nonahydrate, 1g/L sodium hydroxide, 1g/L disodium ethylenediamine tetraacetate and 0.2g/L double-bonded silver-loaded graphene oxide.
  3. 3. The method for preparing the high-strength and high-toughness brass material according to claim 1, wherein the working conditions of the plasma electrolytic oxidation treatment are that the positive voltage is 520V, the forward current is 1.4A, the frequency is 2000Hz, the negative voltage is 30V, the oxidation time is 30min, the positive duty ratio and the negative duty ratio are 20%, and the temperature is 40-45 ℃.
  4. 4. The preparation method of the high-strength high-toughness brass material is characterized in that in the hole sealing paint, the weight ratio of the double-bonded silver-loaded graphene oxide to the modified MXene is 1:1, wherein the weight ratio is 5-12 parts of vinyl end-capped polyurethane, 8-19 parts of acrylate monomer, 4-11 parts of reactive diluent, 20-25 parts of solvent and 1-3 parts of photoinitiator.
  5. 5. The preparation method of the high-strength and high-toughness brass material is characterized in that the reactive diluent is one or more of butyl acrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate and trimethylolpropane trimethacrylate, and the acrylate monomer is prepared by compounding o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate and octadecyl acrylate according to a mass ratio of 4:1:1:0.3.
  6. 6. The method for preparing a high strength and high toughness brass material in accordance with claim 1, wherein said preparing of said vinyl terminated polyurethane comprises the steps of: Mixing isophorone diisocyanate, polypropylene glycol and hydroxyl-terminated polydimethylsiloxane under nitrogen atmosphere, adding dibutyltin dilaurate, mixing, heating to 82-85 ℃, stirring for 1-2h, cooling to 45-50 ℃, adding hydroxyethyl methacrylate, and continuing to keep the temperature for 2-3h to obtain vinyl-terminated polyurethane.
  7. 7. The method for preparing a high-strength and high-toughness brass material according to claim 1, wherein in the preparation of the modified MXene, the preparation of the double bond-containing bisbenzimidazole ring derivative includes the following steps: A. Mixing lauric acid, o-phenylenediamine and dimethylbenzene under the nitrogen atmosphere, heating to 158-160 ℃ and preserving heat for 4-5h, then heating to 218-220 ℃ and preserving heat for 160-200min, cooling and distilling under reduced pressure to obtain a benzimidazole matrix; B. Mixing benzimidazole matrix with sodium hydroxide, adding dimethyl sulfoxide, stirring at 58-60deg.C for 50-70min, adding epichlorohydrin, stirring for 11-12 hr, and cooling to obtain hydroxylated bisbenzimidazole ring derivative; C. Mixing the hydroxylated bisbenzimidazole ring derivative and the acryloyl chloride, adding the mixed solution of the sodium hydroxide solution and the dimethyl sulfoxide solution, and preserving the temperature for 9-10 hours at 48-50 ℃ to obtain the bisbenzimidazole ring derivative containing double bonds.
  8. 8. A high strength, high toughness brass material prepared by the method of any one of claims 1-7.

Description

High-strength high-toughness brass material and preparation method thereof Technical Field The invention relates to the technical field of brass materials, in particular to a high-strength high-toughness brass material and a preparation method thereof. Background Copper and copper alloy play an important role in the fields of aerospace, marine ships, transportation, mechanical instruments, electronic appliances, information communication and the like because of having good processability, electrical conductivity and thermal conductivity, wherein the research and development and application of the high-strength and high-toughness copper alloy are more in order to meet the requirements of modern equipment on the comprehensive performance of structural materials, however, the materials still have inherent performance defects such as insufficient wear resistance and corrosion resistance, and the like, limit the long-term application of the materials under severe working conditions, particularly in corrosive environments such as high temperature, high humidity and high salt fog, the surfaces are extremely easy to generate electrochemical corrosion, the surface integrity of the materials is damaged, the heat conduction and electrical conduction functions and the mechanical properties of the materials are obviously deteriorated, and the efficiency of the devices is reduced and even fails in advance. The prior art generally improves the corrosion resistance of the surface of the copper alloy through a coating or a plating layer, but most plating layers generally have inherent defects of non-compact structure, higher porosity and the like, and the micropores become channels for corrosive media to permeate into a matrix in the service process, so that the failure of materials is accelerated. Although the traditional polymer coating, such as an epoxy resin coating, an acrylic resin coating and the like can provide good isolation protection, the interface bonding strength between the traditional polymer coating and a metal substrate is insufficient, the traditional polymer coating is easy to peel under the action of thermal stress or mechanical stress, and meanwhile, most of the polymer coating has insulating characteristics, so that the conductivity of the brass material subjected to surface strengthening treatment is reduced, and the application scene of the brass material is limited. Disclosure of Invention The invention aims to provide a high-strength high-toughness brass material and a preparation method thereof, so as to solve the problems in the prior art. In order to solve the technical problems, the invention provides the following technical scheme: A preparation method of a high-strength high-toughness brass material comprises the following steps: S1, taking a brass rod as a base material, and sequentially carrying out frosting, polishing, cleaning and drying to obtain a brass base material; s2, transferring the brass base material into electrolyte, performing plasma electrolytic oxidation treatment, and drying to obtain a pretreated base material; s3, mixing vinyl terminated polyurethane, an acrylic ester monomer, a reactive diluent, double-bonded silver-loaded graphene oxide, modified MXene and a solvent, adding a photoinitiator, and carrying out ultrasonic stirring to obtain a hole sealing coating; s4, coating the hole sealing paint on the surface of the pretreated substrate, and carrying out photo-curing treatment to obtain the high-strength high-toughness brass material. Further, the electrolyte comprises deionized water as a solvent, and contains 8g/L sodium silicate nonahydrate, 1g/L sodium hydroxide, 1g/L disodium ethylenediamine tetraacetate and 0.2g/L double-bonded silver-loaded graphene oxide. Further, the working condition of the plasma electrolytic oxidation treatment is that the positive voltage is 520V, the forward current is 1.4A, the frequency is 2000Hz, the negative voltage is 30V, the oxidation time is 30min, the positive duty ratio and the negative duty ratio are 20%, and the temperature is 40-45 ℃. Further, in the hole sealing coating, the mass ratio of the sum of the masses of the doubly-bonded silver-loaded graphene oxide and the modified MXene to the acrylic ester monomer is (0.1-0.15): 1, and the mass ratio of the doubly-bonded silver-loaded graphene oxide to the modified MXene is 1:1. Further, the reactive diluent is one or more of butyl acrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate and trimethylolpropane trimethacrylate, and the acrylate monomer is prepared by compounding o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate and octadecyl acrylate according to a mass ratio of 4:1:1:0.3. Further, the reactive diluent is dipropylene glycol diacrylate and trimethylolpropane trimethacrylate which are compounded according to the mass ratio of 3:1. Further, the preparation of the double-bonded silver-loaded graphene oxide comprises the following st