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CN-122013182-A - High-strength rust-resistant structural steel material and preparation method thereof

CN122013182ACN 122013182 ACN122013182 ACN 122013182ACN-122013182-A

Abstract

The invention discloses a high-strength rust-resistant structural steel material and a preparation method thereof, belongs to the technical field of structural steel preparation, and is used for solving the technical problem that the mechanical property and corrosion resistance of the structural steel material in the prior art are to be further improved; according to the invention, by taking the hybridization film forming liquid as a continuous phase, cerium modified corrosion inhibition filler is introduced at one side close to the steel matrix, molybdenum modified barrier filler is introduced in the surface layer area, and a composite protection system with the thickness direction division is constructed.

Inventors

  • YU LAN
  • LI GUANGHUA
  • XIONG XIAOQIANG
  • Ying Xinjie
  • HE CHANGYONG

Assignees

  • 四川炎赫科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. The preparation method of the high-strength rust-resistant structural steel material is characterized by comprising the following steps of: S1, adding a composite steel substrate into a smelting furnace, heating and smelting under nitrogen, pouring the molten steel into a mold for molding after the molten steel is uniform, naturally cooling and demolding to obtain a steel billet, and performing aftertreatment to obtain a high-strength structural steel substrate; S2, adding the cerium modified corrosion inhibition filler and the hybridization film forming liquid into a reaction kettle, stirring until the cerium modified corrosion inhibition filler and the hybridization film forming liquid are uniformly dispersed to obtain a bottom coating liquid, coating the bottom coating liquid on the surface of the high-strength structural steel substrate, and performing post-treatment to obtain an interface corrosion inhibition layer structural steel substrate; and S3, adding the molybdenum modified barrier filler and the hybridization film-forming liquid into a reaction kettle, stirring until the mixture is uniformly dispersed to obtain a surface layer coating liquid, coating the surface layer coating liquid on the surface of the interface corrosion inhibition layer structural steel substrate, and performing aftertreatment to obtain the high-strength corrosion-resistant structural steel material.
  2. 2. The method for preparing the high-strength rust-resistant structural steel material according to claim 1, wherein in the step S1, the composite steel substrate is obtained by mixing 1900-1920g of iron, graphite, manganese, silicon, chromium, nickel, copper, molybdenum, niobium and titanium according to the dosage ratio of 1900-1920g to 24-32g to 5-6g to 10-12g to 8-10g to 6-8g to 3-5g to 1g, the dosage ratio of cerium modified corrosion inhibition filler to hybridization film forming liquid is 2-3g to 100mL, the dry film thickness of the bottom coating liquid is 8-12 mu m, and the dosage ratio of molybdenum modified barrier filler to hybridization film forming liquid in the step S3 is 0.2-0.4g to 100mL, wherein the dry film thickness of the surface coating liquid is 18-24 mu m.
  3. 3. The method for preparing the high-strength rust-resistant structural steel material according to claim 1, wherein the cerium-modified corrosion-inhibiting filler is prepared by the following method: A1, adding tungstate mixed liquor into a reaction kettle, then dropwise adding metal salt mixed liquor, controlling the temperature of the reaction kettle to be 60-70 ℃, controlling the pH value of a reaction system to be 9.5-10.2, continuously preserving heat and stirring for 6-8 hours after the dropwise adding is finished, and performing post-treatment to obtain a zinc-aluminum tungstic acid precursor; A2, adding zinc aluminum tungstic acid precursor and deionized water into a reaction kettle, stirring until the zinc aluminum tungstic acid precursor and the deionized water are mixed uniformly, adding cerium nitrate hexahydrate, stirring uniformly, adding 30wt% hydrogen peroxide solution, adjusting the pH value of a reaction system to be 8.3-8.8 by using 25-28wt% ammonia water, heating the reaction kettle to 35-45 ℃, keeping the temperature, stirring for 2-4 hours, and performing post treatment to obtain the cerium modified corrosion inhibition filler.
  4. 4. The method for preparing the high-strength rust-resistant structural steel material according to claim 3, wherein in the step A1, the metal salt mixed solution is obtained by mixing zinc nitrate hexahydrate, aluminum nitrate nonahydrate and deionized water according to the dosage ratio of 16-18g to 5-8g to 120mL, and the tungstate mixed solution is obtained by mixing sodium tungstate dihydrate, sodium hydroxide and deionized water according to the dosage ratio of 7-9g to 8-10g to 160 mL.
  5. 5. The method for preparing the high-strength rust-resistant structural steel material according to claim 3, wherein in the step A1, the volume ratio of the metal salt mixed solution to the tungstate mixed solution is 5mL, the mixed solution is 6-7mL, the dripping time is 2-3h, and in the step A2, the dosage ratio of the zinc aluminum tungstic acid precursor, deionized water, cerium nitrate hexahydrate and 30wt% hydrogen peroxide solution is 21-27g:500mL, 9-12g:1-2mL.
  6. 6. The method for preparing the high-strength rust-resistant structural steel material according to claim 1, wherein the molybdenum-modified barrier filler is prepared by the following method: adding graphene oxide and 1.5wt% hydrochloric acid aqueous solution into a reaction kettle, stirring until the graphene oxide and the hydrochloric acid aqueous solution are uniformly dispersed, adding aniline and m-aminobenzenesulfonic acid, cooling the reaction kettle to 0-5 ℃, dropwise adding 10wt% ammonium persulfate aqueous solution, continuing to perform heat preservation and stirring at 0-5 ℃ for 5-7 hours after the dropwise adding is finished, and performing aftertreatment to obtain polyaniline graphene precursors; And B2, adding the polyaniline graphene precursor, absolute ethyl alcohol and deionized water into a reaction kettle, stirring until the materials are uniformly mixed, adding ammonium heptamolybdate tetrahydrate, adding glacial acetic acid to regulate the pH value of a reaction system to be 4.0-4.5, heating the reaction kettle to 35-45 ℃, keeping the temperature, stirring for 2-3 hours, and performing post treatment to obtain the molybdenum modified barrier filler.
  7. 7. The method for preparing the high-strength rust-resistant structural steel material according to claim 6, wherein in the step B1, the dosage ratio of the graphene oxide, the 1.5wt% hydrochloric acid aqueous solution, the aniline, the metaaminobenzenesulfonic acid and the 10wt% ammonium persulfate aqueous solution is 2-3g:500mL:2-3g:4-5g:40-60mL, and in the step B2, the dosage ratio of the polyaniline graphene precursor, the absolute ethyl alcohol, the deionized water and the ammonium heptamolybdate tetrahydrate is 9-10g:100 mL:3-4g.
  8. 8. The preparation method of the high-strength rust-resistant structural steel material is characterized by comprising the steps of adding absolute ethyl alcohol, deionized water and glacial acetic acid into a reaction kettle, stirring uniformly, sequentially adding 3-glycidyloxypropyl trimethoxysilane, 3-aminopropyl triethoxysilane and tetraethoxysilane, stirring, then adding bisphenol A epoxy resin, stirring continuously for dispersion for 30-50min, and standing for deaeration to obtain the hybridized film-forming liquid.
  9. 9. The method for preparing the high-strength rust-resistant structural steel material according to claim 8, wherein in the process of preparing the hybrid film-forming liquid, the dosage ratio of the absolute ethyl alcohol, deionized water, glacial acetic acid, 3-glycidyloxypropyl trimethoxysilane, 3-aminopropyl triethoxysilane, tetraethoxysilane and bisphenol A epoxy resin is 40mL:10mL:1mL:4-6mL:2-3mL:4-5mL:50g, and the hybrid film-forming liquid is required to be used within 4-6 h.
  10. 10. A high strength corrosion resistant structural steel material, characterized in that the high strength corrosion resistant structural steel material is prepared by a method for preparing a high strength corrosion resistant structural steel material according to any one of claims 1-9.

Description

High-strength rust-resistant structural steel material and preparation method thereof Technical Field The invention relates to the technical field of structural steel preparation, in particular to a high-strength rust-resistant structural steel material and a preparation method thereof. Background In the prior art, high-strength structural steel is widely applied to the fields of engineering equipment, transportation, energy facilities, building components and the like in order to meet the requirements of bearing capacity and light weight, and aims at the problem that the steel is easily corroded by moisture, oxygen and salt media in the service environment, the corrosion resistance is generally improved in a surface protection mode, for example, an organic coating, an inorganic conversion film, a zinc-rich primer, an anti-rust pigment filler system or a composite protective coating is arranged on the surface of a steel substrate, and an epoxy resin, silane, lamellar fillers and corrosion inhibition components are combined to construct a protective layer so as to form a protective structure for isolating the media and delaying the corrosion process on the surface of the substrate. However, in the existing high-strength structural steel protection system, a few schemes are more focused on single blocking or single corrosion inhibition effect, the function distribution in the thickness direction of the coating is not clear enough, so that the area close to the steel matrix and the area far away from the steel matrix often bear similar effects, and the interface transition layer lacks targeted adjustment, so that after external media permeate for a long time, the steel matrix-coating interface is easy to become a preferential instability area, the tendency of local activation, the decline of the attachment state and the expansion along the interface occurs, and further the corrosion inhibition effect is difficult to continuously exert at the position of a key interface, so that the integral durability of the protection layer is insufficient. In addition, although some existing protective materials introduce lamellar fillers or inorganic functional particles to improve the barrier effect, the compatibility, dispersion stability and intra-layer cooperative relationship between the fillers and a film forming system still have the defects, so that the problems of agglomeration, local loosening or discontinuous control of mass transfer channels are easily formed in the film layer, and especially when high-strength structural steel simultaneously faces the coupling effect of mechanical load and corrosive media, if the coating lacks a cooperative structure with stable interface, in-layer compactness and surface layer barrier, micro defect expansion easily occurs in the service process, so that the corrosion resistance and the overall structure retention are difficult to be compatible. In view of the technical drawbacks of this aspect, a solution is now proposed. Disclosure of Invention The invention aims to provide a high-strength rust-resistant structural steel material and a preparation method thereof, which are used for solving the technical problem that the mechanical property and corrosion resistance of the structural steel material in the prior art are required to be further improved. The aim of the invention can be achieved by the following technical scheme: a preparation method of a high-strength rust-resistant structural steel material comprises the following steps: S1, adding a composite steel substrate into a smelting furnace, heating and smelting under nitrogen, pouring the molten steel into a mold for molding after the molten steel is uniform, naturally cooling and demolding to obtain a steel billet, and performing aftertreatment to obtain a high-strength structural steel substrate; S2, adding the cerium modified corrosion inhibition filler and the hybridization film forming liquid into a reaction kettle, stirring until the cerium modified corrosion inhibition filler and the hybridization film forming liquid are uniformly dispersed to obtain a bottom coating liquid, coating the bottom coating liquid on the surface of the high-strength structural steel substrate, and performing post-treatment to obtain an interface corrosion inhibition layer structural steel substrate; and S3, adding the molybdenum modified barrier filler and the hybridization film-forming liquid into a reaction kettle, stirring until the mixture is uniformly dispersed to obtain a surface layer coating liquid, coating the surface layer coating liquid on the surface of the interface corrosion inhibition layer structural steel substrate, and performing aftertreatment to obtain the high-strength corrosion-resistant structural steel material. Further, in the step S1, the composite steel base material is obtained by mixing 1900-1920g of iron, graphite, manganese, silicon, chromium, nickel, copper, molybdenum, niobium and titanium according to