High-strength corrosion-resistant aluminum material and method for manufacturing the same

Abstract

The application relates to the technical field of aluminum alloys, in particular to a high-strength corrosion-resistant aluminum material and a preparation method thereof. Raw materials such as a chitosan corrosion inhibitor, an amino acid corrosion inhibitor, a polysulfone and a lignosulfonate are mixed to obtain a microcapsule corrosion inhibitor; the microcapsule corrosion inhibitor is added into a dopamine solution to obtain a dopamine microcapsule corrosion inhibitor through stirring reaction. The dopamine microcapsule corrosion inhibitor and a curing agent are added into an epoxy resin to obtain an epoxy resin paint; the epoxy resin paint is coated on the surface of pretreated aluminum profiles to obtain a finished product. The finished product prepared by the application has good corrosion resistance, durability and crack resistance, so the application has a wide application prospect in the technical field of aluminum alloys.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy, and particularly relates to a high-strength corrosion-resistant aluminum material and a preparation method thereof. BACKGROUND

[0002] Aluminum alloy profiles have significant modern value in modern industry and construction due to their unique properties and advantages. The following is a detailed description of the modern value of aluminum alloy profiles:

[0003] 1. Aluminum alloy profiles are an important choice for modern engineering materials due to their lightweight and high-strength characteristics. Compared to traditional steel, aluminum alloy has a lower density but higher strength and stiffness. This allows aluminum alloy profiles to achieve higher load-bearing capacity and longer service life in building structures, transportation, and other fields, while reducing overall weight and energy consumption.

[0004] 2. Aluminum alloy profiles have good workability and can be processed through extrusion, casting, forging, and other processes. This allows aluminum alloy profiles to be suitable for various complex geometric shapes and structural designs. The development of modern numerical control processing technology further improves the processing precision and efficiency of aluminum alloy profiles, meeting the needs of high-end manufacturing and precision engineering.

[0005] 3. Aluminum alloy profiles are recyclable materials with significant environmental advantages. The recycling and reuse of aluminum has low energy consumption and does not affect its performance, meeting the requirements of modern society for sustainable development and circular economy. Widespread use of aluminum alloy profiles helps reduce dependence on limited resources, reduces environmental pollution, and promotes the development of green buildings and green transportation.

[0006] Aluminum alloy profiles are widely used in construction, transportation, aerospace, and other fields, and their service life directly affects the overall efficiency of engineering projects. Improving corrosion resistance can effectively prevent oxidation and corrosion of aluminum alloy in harsh environments, reducing material degradation and structural damage caused by corrosion. Enhancing strength and durability can withstand external impact and fatigue damage, extending the service life of materials, reducing maintenance and replacement costs, and improving the economic efficiency of engineering.

[0007] In order to overcome the defects of the prior art, the present application provides a high-strength corrosion-resistant aluminum material and a preparation method thereof. SUMMARY

[0008] The purpose of the present application is to provide a high-strength corrosion-resistant aluminum material and a preparation method thereof to solve the problems in the prior art.

[0009] In order to solve the above technical problems, the present application provides the following technical solutions:

[0010] A preparation method of high-strength corrosion-resistant aluminum material, comprising the following steps:

[0011] Step one: mix the chitosan corrosion inhibitor, amino acid corrosion inhibitor, polysulfone and dichloromethane, fully stir, and obtain an oil phase; then configure a surfactant solution as an aqueous phase, slowly drop the oil phase into the aqueous phase, uniformly stir to obtain a pre-emulsion, evaporate dichloromethane at 35-40 DEG C, and then filter, wash with water, wash with alcohol, filter and dry to obtain a microcapsule corrosion inhibitor; add the microcapsule corrosion inhibitor into a dopamine solution, stir for 10-15 h, and then wash with water, wash with alcohol, filter and dry after the reaction to obtain a dopamine microcapsule corrosion inhibitor;

[0012] Step two: add the dopamine microcapsule corrosion inhibitor into preheated epoxy resin, then add a curing agent and stir for 20-30 min to obtain an epoxy resin coating; take aluminum profiles, polish, wash with alcohol, immerse in a dopamine solution for 10-15 h, then coat the epoxy resin coating and cure at 60-70 DEG C for 8-10 h to obtain finished products.

[0013] More preferably, in step one, the mass ratio of the chitosan corrosion inhibitor, amino acid corrosion inhibitor and polysulfone is (1.2-1.5):1:1.

[0014] More preferably, in step one, the preparation process of the chitosan corrosion inhibitor is as follows: add chitosan into an acetic acid solution, swell for 1-2 h, then add 2-pyridine formaldehyde solution, heat to 80-90 DEG C and react for 6-8 h, then adjust pH, filter, wash with alcohol and vacuum dry after the reaction to obtain Schiff base chitosan; mix 8-hydroxyquinoline, concentrated hydrochloric acid and formaldehyde solution, continuously introduce hydrogen chloride gas and stir at 25-28 DEG C for 10-12 h, then filter, wash and vacuum dry after the reaction to obtain chlorinated hydroxyquinoline; add the Schiff base chitosan into an acetic acid solution, swell for 1-2 h, then add chlorinated hydroxyquinoline, heat to 80-90 DEG C and react for 20-25 h, then adjust pH, filter, wash with alcohol and vacuum dry after the reaction to obtain the chitosan corrosion inhibitor.

[0015] More preferably, when preparing the Schiff base chitosan, the mass ratio of chitosan and 2-pyridine formaldehyde is 1:(4.0-4.5); when preparing the chlorinated hydroxyquinoline, the mass-volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid and formaldehyde solution is 1:(1.0-1.2):1; when preparing the chitosan corrosion inhibitor, the mass ratio of Schiff base chitosan and chlorinated hydroxyquinoline is 1:(1.1-1.2); the concentration of the acetic acid solution is 3-5 wt%; the concentration of the concentrated hydrochloric acid is 36.5-37 wt%, and the concentration of the formaldehyde solution is 37-40 wt%.

[0016] More preferably, in step one, the preparation process of the amino acid corrosion inhibitor is as follows: mixing cysteine, sodium hydroxide and anhydrous ethanol, adding p-phenylenediamine solution drop by drop at 30-40 DEG C, fully stirring until the solid no longer increases, and obtaining the Schiff base amino acid after cooling, alcohol washing, grinding, mixing modified graphene, Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol, and irradiating under ultraviolet light for 10-20 min, and obtaining the amino acid corrosion inhibitor after extraction, drying, filtration, rotary evaporation and vacuum drying.

[0017] More preferably, in the preparation of the Schiff base amino acid, the molar ratio of cysteine, sodium hydroxide and p-phenylenediamine is (1.8-2.0):1:1, and in the preparation of the amino acid corrosion inhibitor, the molar ratio of the C=C of the modified graphene and the sulfhydryl of the Schiff base amino acid is 1:(1.5-2.0), and the amount of the 1173 photoinitiator accounts for 4-5 wt%.

[0018] More preferably, the preparation process of the modified graphene is as follows: mixing graphene oxide and anhydrous ethanol, uniformly ultrasonic dispersing, then adding gamma-methacryloyloxypropyltrimethoxysilane, refluxing at 110-120 DEG C for 10-12 h, and obtaining the modified graphene after suction filtration, washing and freeze-drying, wherein the reaction mass ratio of graphene oxide and gamma-methacryloyloxypropyltrimethoxysilane is (0.2-0.3):3.

[0019] More preferably, in step one, the lignin sulfonate is dissolved in water to obtain a surfactant solution with a concentration of 1.5-1.8 wt%.

[0020] More preferably, in step one or step two, the pH value of the dopamine solution is 7.5-8.0, and the concentration is 1.2-1.5 g / L.

[0021] More preferably, in step two, the reaction mass ratio of the dopamine microcapsule corrosion inhibitor, the epoxy resin and the curing agent is (0.2-0.3):3:1.

[0022] The beneficial effects of the present application are as follows:

[0023] The application is characterized in that chitosan, a green and environmentally friendly material, is used as the main raw material, and a Schiff base chitosan is generated by condensation reaction between the amino group on the surface of chitosan and 2-pyridine formaldehyde; further, a chitosan corrosion inhibitor is obtained by substitution reaction between the prepared chlorinated hydroxyquinoline and the hydroxyl group on the surface of the Schiff base chitosan. The Schiff base structure in the chitosan corrosion inhibitor can form a stable chelate with metal ions, which helps to form a protective film on the metal surface, preventing the corrosion medium (such as water, acid, alkali, etc.) from directly contacting the metal, and has good corrosion resistance; the nitrogen atom in the pyridine structure can form a coordination bond with metal ions, enhancing the adhesion of the corrosion inhibitor on the metal surface and further improving the corrosion resistance; the chlorinated hydroxyquinoline component has strong chelating ability and can form a stable chelate with metal ions, effectively preventing the corrosion process. In summary, the chitosan corrosion inhibitor can form multiple protective films on the metal surface by combining various corrosion-resistant structures, effectively preventing the corrosion of the corrosion medium, and exhibiting excellent comprehensive corrosion resistance.

[0024] The application is characterized in that biomass cysteine is used as the main raw material, and a Schiff base amino acid is generated by condensation reaction between the amino group on the surface of cysteine and p-phenylenedimethylene; further, a modified graphene with C=C and the mercapto group on the surface of the Schiff base amino acid are subjected to click reaction to prepare an amino acid corrosion inhibitor. On the one hand, the Schiff base structure in the amino acid corrosion inhibitor has good corrosion resistance; on the other hand, the modified graphene can form a continuous and dense protective film on the metal surface, effectively isolating the corrosion medium and providing long-term corrosion protection; in addition, the high strength and rigidity of graphene can effectively enhance the mechanical properties of the material, making it less likely to deform and damage when subjected to external forces, and exhibiting better durability and crack resistance.

[0025] In step one, a microcapsule corrosion inhibitor is prepared by taking the chitosan corrosion inhibitor and the amino acid corrosion inhibitor as the core material and poly sulfone as the wall material, and a dopamine layer is introduced on the outer wall of the capsule to prepare a dopamine microcapsule corrosion inhibitor. In step two, the dopamine microcapsule corrosion inhibitor and the curing agent are added to the epoxy resin to obtain an epoxy resin coating; the epoxy resin coating is coated on the surface of the aluminum profile pretreated by dopamine to obtain a finished product. The dopamine layer on the surface of the microcapsule corrosion inhibitor has a synergistic effect on the surface corrosion resistance of the aluminum profile. In addition, the aluminum profile pretreated by dopamine and the epoxy resin coating layer added with the dopamine microcapsule corrosion inhibitor can achieve closer adhesion, thereby significantly improving the interfacial bonding strength and effectively reducing the risk of coating peeling. In summary, the finished product prepared by the application has good corrosion resistance, durability and crack resistance. DETAILED DESCRIPTION

[0026] The technical solutions in the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0027] Raw material sources:

[0028] Chitosan was provided by Shanghai Maikelin Biochemical Technology Co., Ltd., with a specification of AR; graphene oxide was provided by Hebei Ruihuang Metal Material Co., Ltd., with a particle size of 35000 meshes; polysulfone was provided by Dalian Polysulfone Plastics Co., Ltd., with a specification of industrial grade; lignin sulfonate was provided by Nanjing Shanhu Chemical Co., Ltd., with a mass fraction of 98wt%; epoxy resin was provided by Shanghai Haoren International Trade Co., Ltd., with a model number of 1009; curing agent was provided by Jinan Chenghao Chemical Co., Ltd., with a model number of T-31.

[0029] Embodiment 1: Step one: chitosan was added to a 5wt% acetic acid solution to swell for 2h, then 2-pyridine formaldehyde solution was added, and the temperature was raised to 90℃ for 8h of reaction. After the reaction, the pH was adjusted, suction filtration, alcohol washing, and vacuum drying were performed to obtain Schiff base chitosan. 8-hydroxyquinoline, 36.5wt% concentrated hydrochloric acid, and 37wt% formaldehyde solution were mixed, and hydrogen chloride gas was continuously introduced and stirred at 28℃ for 12h of reaction. After the reaction, suction filtration, washing, and vacuum drying were performed to obtain chlorinated hydroxyquinoline. Schiff base chitosan was added to a 5wt% acetic acid solution to swell for 2h, then chlorinated hydroxyquinoline was added, and the temperature was raised to 90℃ for 25h of reaction. After the reaction, the pH was adjusted, suction filtration, alcohol washing, and vacuum drying were performed to obtain chitosan corrosion inhibitor. When preparing Schiff base chitosan, the mass ratio of chitosan and 2-pyridine formaldehyde was 1:4.3. When preparing chlorinated hydroxyquinoline, the mass-volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid, and formaldehyde solution was 1:1.1:1. When preparing chitosan corrosion inhibitor, the mass ratio of Schiff base chitosan and chlorinated hydroxyquinoline was 1:1.2.

[0030] Cysteine, sodium hydroxide and anhydrous ethanol are mixed, and a solution of p-phenylenediformaldehyde is added dropwise at 40℃, and stirred until the solid no longer increases, and after the reaction is completed, it is cooled, washed with alcohol, ground, to obtain a Schiff base amino acid; graphene oxide and anhydrous ethanol are mixed and uniformly dispersed by ultrasonic, then γ-methacryloyloxypropyltrimethoxysilane is added, and refluxed at 120℃ for 12h, and after the reaction is completed, it is filtered, washed, freeze-dried, to obtain modified graphene; the modified graphene, Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol are mixed and irradiated with ultraviolet light for 20min, and after the reaction is completed, it is extracted, dried, filtered, rotary evaporated and vacuum dried, to obtain an amino acid corrosion inhibitor; when preparing the Schiff base amino acid, the molar ratio of cysteine, sodium hydroxide and p-phenylenediformaldehyde is 1.9:1:1; when preparing the amino acid corrosion inhibitor, the molar ratio of the C=C of the modified graphene and the sulfhydryl of the Schiff base amino acid is 1:1.7; the amount of the 1173 photoinitiator accounts for 5wt%; wherein the mass ratio of graphene oxide and γ-methacryloyloxypropyltrimethoxysilane is 0.3:3;

[0031] The chitosan corrosion inhibitor, amino acid corrosion inhibitor, polysulfone and dichloromethane are mixed and stirred to obtain an oil phase; the lignosulfonate is dissolved in water to obtain a 1.8wt% surfactant solution as an aqueous phase, the oil phase is slowly added to the aqueous phase, and the pre-emulsion is obtained by uniformly stirring, then the dichloromethane is evaporated at 40℃, and the microcapsule corrosion inhibitor is obtained by filtration, water washing, alcohol washing, filtration and drying; the microcapsule corrosion inhibitor is added to the dopamine solution, and stirred for 15h, then the dopamine microcapsule corrosion inhibitor is obtained by water washing, alcohol washing, filtration and drying; the mass ratio of the chitosan corrosion inhibitor, amino acid corrosion inhibitor and polysulfone is 1.3:1:1; the pH value of the dopamine solution is 7.5, and the concentration is 1.5g / L;

[0032] Step two: the dopamine microcapsule corrosion inhibitor is added to the preheated epoxy resin, then the curing agent is added and stirred for 30min to obtain an epoxy resin coating; the aluminum profile is polished, alcohol washed, immersed in the dopamine solution for 15h, then coated with the epoxy resin coating and cured at 70℃ for 10h to obtain a finished product; wherein the mass ratio of the dopamine microcapsule corrosion inhibitor, epoxy resin and curing agent is 0.3:3:1.

[0033] Example 2: Step one: add chitosan to a 5wt% acetic acid solution to swell for 1.5h, then add 2-pyridine formaldehyde solution, heat to 85℃ for 7h, after the reaction is completed, adjust the pH, filter, alcohol wash, vacuum drying, to obtain the Schiff base chitosan; mix 8-hydroxyquinoline, 36.5wt% concentrated hydrochloric acid and 37wt% formaldehyde solution, continuously pass in hydrogen chloride gas at 27℃ for 11h, after the reaction is completed, filter, wash, vacuum drying, to obtain the chlorinated hydroxyquinoline; add the Schiff base chitosan to a 5wt% acetic acid solution to swell for 1.5h, then add the chlorinated hydroxyquinoline, heat to 85℃ for 23h, after the reaction is completed, adjust the pH, filter, alcohol wash, vacuum drying, to obtain the chitosan corrosion inhibitor; when preparing the Schiff base chitosan, the mass ratio of chitosan and 2-pyridine formaldehyde is 1:4.3; when preparing the chlorinated hydroxyquinoline, the mass volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid and formaldehyde solution is 1:1.1:1; when preparing the chitosan corrosion inhibitor, the mass ratio of Schiff base chitosan and chlorinated hydroxyquinoline is 1:1.2;

[0034] Mix cysteine, sodium hydroxide and anhydrous ethanol, drop in p-xylylene formaldehyde solution at 35℃, fully stir until the solid no longer increases, after the reaction is completed, cool, alcohol wash, grind, to obtain the Schiff base amino acid; mix graphene oxide and anhydrous ethanol, ultrasonic dispersion, then add γ-methacryloyloxypropyltrimethoxysilane, reflux at 115℃ for 11h, after the reaction is completed, filter, wash, freeze drying, to obtain the modified graphene; mix the modified graphene, Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol, irradiate under ultraviolet light for 15min, after the reaction is completed, extract, dry, filter, rotary evaporation, vacuum drying, to obtain the amino acid corrosion inhibitor; when preparing the Schiff base amino acid, the molar ratio of cysteine, sodium hydroxide and p-xylylene formaldehyde is 1.9:1:1; when preparing the amino acid corrosion inhibitor, the molar ratio of the C=C of the modified graphene and the sulfhydryl of the Schiff base amino acid is 1:1.7; the amount of the 1173 photoinitiator is 5wt%; wherein the mass ratio of graphene oxide and γ-methacryloyloxypropyltrimethoxysilane is 0.3:3;

[0035] The chitosan corrosion inhibitor, amino acid corrosion inhibitor, polysulfone and dichloromethane are mixed, stirred sufficiently to obtain an oil phase; the lignosulfonate is dissolved in water to obtain a 1.8wt% surfactant solution as an aqueous phase, the oil phase is slowly added into the aqueous phase, and uniform stirring is performed to obtain a pre-emulsion, then dichloromethane is evaporated at 37℃ under stirring, and filtration, water washing, alcohol washing, filtration and drying are performed to obtain a microcapsule corrosion inhibitor; the microcapsule corrosion inhibitor is added into a dopamine solution, and stirring reaction is performed for 13h, then water washing, alcohol washing, filtration and drying are performed after reaction to obtain a dopamine microcapsule corrosion inhibitor; the reaction mass ratio of the chitosan corrosion inhibitor, amino acid corrosion inhibitor and polysulfone is 1.3:1:1; the dopamine solution has a pH value of 7.5 and a concentration of 1.5g / L;

[0036] Step two: the dopamine microcapsule corrosion inhibitor is added into preheated epoxy resin, a curing agent is further added and stirring is performed for 25min to obtain an epoxy resin coating; an aluminum profile is polished, alcohol washed, immersed in a dopamine solution for 13h, coated with the epoxy resin coating and cured at 65℃ for 9h to obtain a finished product; the reaction mass ratio of the dopamine microcapsule corrosion inhibitor, epoxy resin and curing agent is 0.3:3:1.

[0037] Example 3: Step one: chitosan is added into a 5wt% acetic acid solution to swell for 1h, a 2-pyridine formaldehyde solution is added, and temperature is raised to 80℃ for reaction for 6h, then pH value is adjusted, suction filtration, alcohol washing and vacuum drying are performed after reaction to obtain a Schiff base chitosan; 8-hydroxyquinoline, 36.5wt% concentrated hydrochloric acid and a formaldehyde solution with a concentration of 37wt% are mixed, hydrogen chloride gas is continuously introduced for stirring reaction for 10h at 25℃, then suction filtration, washing and vacuum drying are performed after reaction to obtain chlorinated hydroxyquinoline; the Schiff base chitosan is added into a 5wt% acetic acid solution to swell for 1h, chlorinated hydroxyquinoline is added, and temperature is raised to 80℃ for reaction for 20h, then pH value is adjusted, suction filtration, alcohol washing and vacuum drying are performed after reaction to obtain a chitosan corrosion inhibitor; when the Schiff base chitosan is prepared, the reaction mass ratio of chitosan and 2-pyridine formaldehyde is 1:4.3; when the chlorinated hydroxyquinoline is prepared, the mass-volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid and formaldehyde solution is 1:1.1:1; when the chitosan corrosion inhibitor is prepared, the reaction mass ratio of the Schiff base chitosan and chlorinated hydroxyquinoline is 1:1.2;

[0038] Cysteine, sodium hydroxide and anhydrous ethanol are mixed, and a solution of p-phenylenediformaldehyde is added dropwise at 30 DEG C, and stirred until the solid no longer increases, and after the reaction is completed, it is cooled, washed with alcohol, ground, to obtain a Schiff base amino acid; graphene oxide and anhydrous ethanol are mixed, ultrasonically dispersed, and then gamma-methacryloxypropyltrimethoxysilane is added, and refluxed at 110 DEG C for 10h, and after the reaction is completed, it is filtered, washed, freeze-dried, to obtain modified graphene; the modified graphene, the Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol are mixed, and irradiated with ultraviolet light for 10min, and after the reaction is completed, it is extracted, dried, filtered, rotary evaporated, vacuum dried, to obtain an amino acid corrosion inhibitor; when preparing the Schiff base amino acid, the molar ratio of cysteine, sodium hydroxide and p-phenylenediformaldehyde is 1.9:1:1; when preparing the amino acid corrosion inhibitor, the molar ratio of the C=C of the modified graphene and the sulfhydryl of the Schiff base amino acid is 1:1.7; the amount of the 1173 photoinitiator is 5wt%; wherein the mass ratio of graphene oxide and gamma-methacryloxypropyltrimethoxysilane is 0.3:3;

[0039] The chitosan corrosion inhibitor, the amino acid corrosion inhibitor, the polysulfone and dichloromethane are mixed and stirred to obtain an oil phase; the lignosulfonate is dissolved in water to obtain a 1.8wt% surfactant solution as an aqueous phase, the oil phase is slowly added to the aqueous phase, and uniformly stirred to obtain a pre-emulsion, and then the dichloromethane is evaporated at 35 DEG C, and filtered, washed with water, washed with alcohol, filtered and dried to obtain a microcapsule corrosion inhibitor; the microcapsule corrosion inhibitor is added to a dopamine solution, and stirred for 10h, and after the reaction is completed, it is washed with water, washed with alcohol, filtered and dried to obtain a dopamine microcapsule corrosion inhibitor; the mass ratio of the chitosan corrosion inhibitor, the amino acid corrosion inhibitor and the polysulfone is 1.3:1:1; the pH value of the dopamine solution is 7.5, and the concentration is 1.5g / L;

[0040] Step two: the dopamine microcapsule corrosion inhibitor is added to a preheated epoxy resin, and a curing agent is added and stirred for 20min to obtain an epoxy resin coating; an aluminum profile is polished, washed with alcohol, immersed in a dopamine solution for 10h, coated with the epoxy resin coating and cured at 60 DEG C for 8h to obtain a finished product; wherein the mass ratio of the dopamine microcapsule corrosion inhibitor, the epoxy resin and the curing agent is 0.3:3:1.

[0041] Comparative Example 1: The chitosan corrosion inhibitor was removed, and the rest was the same as Example 1, and the specific steps were as follows: Step one: cysteine, sodium hydroxide and anhydrous ethanol were mixed, and p-phenylenediformaldehyde solution was added dropwise at 40℃, and fully stirred until the solid no longer increased, and after the reaction was completed, it was cooled, washed with alcohol, ground, to obtain a Schiff base amino acid; graphene oxide and anhydrous ethanol were mixed, ultrasonically dispersed uniformly, and then γ-methacryloxypropyltrimethoxysilane was added, and refluxed at 120℃ for 12h, and after the reaction was completed, it was filtered, washed, freeze-dried, to obtain modified graphene; the modified graphene, Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol were mixed, and irradiated with ultraviolet light for 20min, and after the reaction was completed, it was extracted, dried, filtered, rotary evaporated, and vacuum dried, to obtain an amino acid corrosion inhibitor; when preparing the Schiff base amino acid, the reaction molar ratio of cysteine, sodium hydroxide and p-phenylenediformaldehyde was 1.9:1:1; when preparing the amino acid corrosion inhibitor, the reaction molar ratio of C=C of the modified graphene and the thiol of the Schiff base amino acid was 1:1.7; the amount of the 1173 photoinitiator was 5wt%; wherein the reaction mass ratio of graphene oxide and γ-methacryloxypropyltrimethoxysilane was 0.3:3;

[0042] The amino acid corrosion inhibitor, polysulfone and dichloromethane were mixed and fully stirred to obtain an oil phase; the lignosulfonate was dissolved in water to obtain a 1.8wt% surfactant solution as an aqueous phase, the oil phase was slowly added to the aqueous phase, and uniformly stirred to obtain a pre-emulsion, and then dichloromethane was evaporated at 40℃, and filtered, washed with water, washed with alcohol, filtered and dried to obtain a microcapsule corrosion inhibitor; the microcapsule corrosion inhibitor was added to a dopamine solution, and stirred for 15h, and after the reaction was completed, it was washed with water, washed with alcohol, filtered and dried to obtain a dopamine microcapsule corrosion inhibitor; the reaction mass ratio of the amino acid corrosion inhibitor and the polysulfone was 1:1; the pH value of the dopamine solution was 7.5, and the concentration was 1.5g / L;

[0043] Step two: the dopamine microcapsule corrosion inhibitor was added to the preheated epoxy resin, and a curing agent was added and stirred for 30min to obtain an epoxy resin coating; an aluminum profile was polished, washed with alcohol, immersed in a dopamine solution for 15h, coated with the epoxy resin coating and cured at 70℃ for 10h to obtain a finished product; wherein the reaction mass ratio of the dopamine microcapsule corrosion inhibitor, the epoxy resin and the curing agent was 0.3:3:1.

[0044] Comparative Example 2: The amino acid corrosion inhibitor was removed, and the rest was the same as Example 1, and the specific steps were as follows: Step one: chitosan was added to a 5wt% acetic acid solution to swell for 2h, then 2-pyridine formaldehyde solution was added, and the temperature was raised to 90℃ for 8h of reaction. After the reaction was completed, the pH was adjusted, suction filtered, alcohol washed, and vacuum dried to obtain a Schiff base chitosan. 8-hydroxyquinoline, concentrated hydrochloric acid with a concentration of 36.5wt%, and formaldehyde solution with a concentration of 37wt% were mixed, and hydrogen chloride gas was continuously introduced and stirred at 28℃ for 12h of reaction. After the reaction was completed, suction filtration, washing, and vacuum drying were performed to obtain a chlorinated hydroxyquinoline. The Schiff base chitosan was added to a 5wt% acetic acid solution to swell for 2h, then the chlorinated hydroxyquinoline was added, and the temperature was raised to 90℃ for 25h of reaction. After the reaction was completed, the pH was adjusted, suction filtered, alcohol washed, and vacuum dried to obtain a chitosan corrosion inhibitor. When preparing the Schiff base chitosan, the mass ratio of chitosan and 2-pyridine formaldehyde was 1:4.3. When preparing the chlorinated hydroxyquinoline, the mass-volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid, and formaldehyde solution was 1:1.1:1. When preparing the chitosan corrosion inhibitor, the mass ratio of the Schiff base chitosan and the chlorinated hydroxyquinoline was 1:1.2.

[0045] The chitosan corrosion inhibitor, polysulfone, and dichloromethane were mixed and stirred thoroughly to obtain an oil phase. Lignosulfonate was dissolved in water to obtain a 1.8wt% surfactant solution as an aqueous phase. The oil phase was slowly added to the aqueous phase, and uniform stirring was performed to obtain a pre-emulsion. Dichloromethane was evaporated at 40℃ with stirring, and filtration, water washing, alcohol washing, filtration, and drying were performed to obtain a microcapsule corrosion inhibitor. The microcapsule corrosion inhibitor was added to a dopamine solution, and stirring was performed for 15h of reaction. After the reaction was completed, water washing, alcohol washing, filtration, and drying were performed to obtain a dopamine microcapsule corrosion inhibitor. The mass ratio of the chitosan corrosion inhibitor and the polysulfone was 1.3:1. The pH value of the dopamine solution was 7.5, and the concentration was 1.5g / L.

[0046] Step two: the dopamine microcapsule corrosion inhibitor was added to preheated epoxy resin, then a curing agent was added and stirred for 30min to obtain an epoxy resin coating. An aluminum profile was polished, alcohol washed, immersed in a dopamine solution for 15h, then coated with the epoxy resin coating and cured at 70℃ for 10h to obtain a finished product. The mass ratio of the dopamine microcapsule corrosion inhibitor, the epoxy resin, and the curing agent was 0.3:3:1.

[0047] Comparative Example 3: The dopamine microcapsule corrosion inhibitor was removed, and the rest was the same as Example 1, and the specific steps were as follows: Step one: a curing agent was added to preheated epoxy resin, and stirring was performed for 30min to obtain an epoxy resin coating. An aluminum profile was polished, alcohol washed, immersed in a dopamine solution for 15h, then coated with the epoxy resin coating and cured at 70℃ for 10h to obtain a finished product. The mass ratio of the epoxy resin and the curing agent was 3:1.

[0048] Test:

[0049] Corrosion resistance test: the finished aluminum profile prepared by the present application is used as a sample, the surface of the sample is treated with filter paper, petroleum ether and degreasing cotton to remove surface grease and moisture, then immersed in a 1 mol / L hydrochloric acid solution for 1 day, after the immersion is completed, the surface corrosion products are removed, and then washed with alcohol, water and dried, finally the mass of the sample before and after immersion is weighed and substituted into the corrosion rate formula to obtain the corrosion rate.

[0050] Fracture toughness test: the epoxy resin paint prepared by the present application is poured into a mold of a specific size, cured at 70°C for 10h, and then polished to obtain a sample. According to the ASTM D5045 standard, a pre-crack is introduced by knocking a blade at the notch, the sample test uses a 500 N sensor, and the indenter speed is 10 mm / min, then the data is substituted into the formula to obtain the fracture toughness index critical stress intensity factor. The results are as follows:

[0051]

[0052] Conclusion: the amount of examples 1-3 remains unchanged, only the reaction parameters are modified. According to the experimental data, the performance of the sample does not change significantly.

[0053] Comparative example 1: remove the chitosan corrosion inhibitor, the rest is the same as example 1, according to the experimental data, compared with example 1, the corrosion rate increases to 0.0048 g / (m 2 ·h), the reason is that the chitosan corrosion inhibitor can form a multi-layer protective film on the metal surface by combining various corrosion-resistant structures, and has excellent comprehensive corrosion resistance, so after removing the chitosan corrosion inhibitor, the corrosion rate of the sample increases and the corrosion resistance decreases.

[0054] Comparative example 2: remove the amino acid corrosion inhibitor, the rest is the same as example 1, according to the experimental data, compared with example 1, the corrosion rate increases to 0.0043 g / (m 2 ·h), and the fracture toughness index critical stress intensity factor decreases to 0.73 MPa·m 1 / 2 , the reason is that the amino acid corrosion inhibitor has good corrosion resistance, durability and crack resistance, so after removing it, the corrosion rate of the sample increases, the corrosion resistance decreases, the fracture toughness index critical stress intensity factor of the sample decreases, and the fracture toughness decreases.

[0055] Comparative example 3: remove the dopamine microcapsule corrosion inhibitor, the rest is the same as example 1, according to the experimental data, compared with example 1, the corrosion rate increases to 0.0062 g / (m 2 ·h), and the fracture toughness index critical stress intensity factor decreases to 0.67 MPa·m1 / 2 The analysis reason is that the dopamine microcapsule corrosion inhibitor contains various corrosion-resistant structures, which can effectively protect the surface of the aluminum profile and improve the corrosion resistance; in addition, the graphene structure in the dopamine microcapsule corrosion inhibitor has high strength and rigidity, which can effectively enhance the mechanical properties of the sample, so that it is not easy to deform and damage when subjected to external force; therefore, after the dopamine microcapsule corrosion inhibitor is removed, the corrosion rate of the sample increases, the corrosion resistance decreases, the critical stress intensity factor of the sample decreases, and the fracture toughness decreases.

[0056] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process method article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process method article or equipment.

[0057] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and does not limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement of part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing a high-strength corrosion-resistant aluminum material, characterized by comprising: The method comprises the following steps: ​ Step one: mix the chitosan corrosion inhibitor, amino acid corrosion inhibitor, polysulfone and dichloromethane, fully stir to obtain an oil phase; then configure a surfactant solution as an aqueous phase, slowly drop the oil phase into the aqueous phase, uniformly stir to obtain a pre-emulsion, evaporate dichloromethane at 35-40 DEG C, and then filter, wash with water, wash with alcohol, filter and dry to obtain a microcapsule corrosion inhibitor; add the microcapsule corrosion inhibitor into a dopamine solution, stir for 10-15 hours, wash with water, wash with alcohol, filter and dry after the reaction to obtain a dopamine microcapsule corrosion inhibitor; Step two: add the dopamine microcapsule corrosion inhibitor into preheated epoxy resin, then add a curing agent and stir for 20-30 minutes to obtain an epoxy resin coating; polish, wash with alcohol, immerse the aluminum profile into the dopamine solution for 10-15 hours, then coat the epoxy resin coating and cure at 60-70 DEG C for 8-10 hours to obtain a finished product; The preparation process of the chitosan corrosion inhibitor comprises the following steps: add chitosan into an acetic acid solution, swell for 1-2 hours, then add a 2-pyridine formaldehyde solution, heat to 80-90 DEG C and react for 6-8 hours, adjust the pH after the reaction, filter, wash with alcohol and vacuum dry to obtain a Schiff base chitosan; mix 8-hydroxyquinoline, concentrated hydrochloric acid and a formaldehyde solution, continuously introduce hydrogen chloride gas and stir at 25-28 DEG C for 10-12 hours, then filter, wash and vacuum dry after the reaction to obtain a chlorinated hydroxyquinoline; add the Schiff base chitosan into an acetic acid solution, swell for 1-2 hours, then add the chlorinated hydroxyquinoline, heat to 80-90 DEG C and react for 20-25 hours, adjust the pH after the reaction, filter, wash with alcohol and vacuum dry to obtain the chitosan corrosion inhibitor; The preparation process of the amino acid corrosion inhibitor comprises the following steps: mix cysteine, sodium hydroxide and anhydrous ethanol, drop the p-phenylenedimethylene solution drop by drop at 30-40 DEG C, fully stir until the solid no longer increases, cool, wash with alcohol and grind after the reaction to obtain a Schiff base amino acid; mix the modified graphene, Schiff base amino acid, 1173 photoinitiator and anhydrous ethanol, irradiate under ultraviolet light for 10-20 minutes, then extract, dry, filter, rotary evaporate and vacuum dry after the reaction to obtain the amino acid corrosion inhibitor.

2. The method of claim 1, wherein the method further comprises: In step one, the mass ratio of the chitosan corrosion inhibitor, amino acid corrosion inhibitor and polysulfone is (1.2-1.5): 1:

1. ​ 3. The method of claim 1, wherein the method further comprises: When preparing the Schiff base chitosan, the mass ratio of chitosan and 2-pyridine formaldehyde is 1: (4.0-4.5); when preparing the chlorinated hydroxyquinoline, the mass-volume ratio of 8-hydroxyquinoline, concentrated hydrochloric acid and formaldehyde solution is 1: (1.0-1.2): 1; when preparing the chitosan corrosion inhibitor, the mass ratio of Schiff base chitosan and chlorinated hydroxyquinoline is 1: (1.1-1.2); the concentration of the acetic acid solution is 3-5 wt%; the concentration of the concentrated hydrochloric acid is 36.5-37 wt%, and the concentration of the formaldehyde solution is 37-40 wt%. ​ 4. The method of claim 1, wherein the method further comprises: The reaction molar ratio of cysteine, sodium hydroxide and p-phenylenediamine is (1.8-2.0):1:1 when preparing the Schiff base amino acid; the reaction molar ratio of the C=C of the modified graphene and the sulfhydryl of the Schiff base amino acid is 1:(1.5-2.0) when preparing the amino acid corrosion inhibitor; and the amount of the 1173 photoinitiator accounts for 4-5wt%. ​ 5. The method of claim 4, wherein the method further comprises: The preparation process of the modified graphene is as follows: graphene oxide and anhydrous ethanol are mixed, ultrasonic dispersion is performed until they are uniformly mixed, then γ-methacryloxypropyltrimethoxysilane is added, and reflux reaction is performed at 110-120℃ for 10-12h; after the reaction is completed, the reaction product is subjected to suction filtration, washing and freeze-drying to obtain the modified graphene; and the reaction mass ratio of the graphene oxide and the γ-methacryloxypropyltrimethoxysilane is (0.2-0.3):

3. ​ 6. The method of claim 1, wherein the method further comprises: In step one, the lignin sulfonate is dissolved in water to obtain a surfactant solution with a concentration of 1.5-1.8wt%. ​ 7. The method of claim 1, wherein the high-strength corrosion-resistant aluminum material is prepared by the steps of: In step one or step two, the pH value of the dopamine solution is 7.5-8.0, and the concentration is 1.2-1.5g / L. ​ 8. The method of claim 1, wherein the high-strength corrosion-resistant aluminum material is prepared by the steps of: In step two, the reaction mass ratio of the dopamine microcapsule corrosion inhibitor, the epoxy resin and the curing agent is (0.2-0.3):3:

1. ​

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