Amino acid gas phase corrosion inhibitor, its preparation method and application

Abstract

The application relates to an amino acid type gas phase corrosion inhibitor and a preparation method and application thereof, the gas phase corrosion inhibitor comprising amino acids and montmorillonite, and the gas phase corrosion inhibitor comprises the following mass percentage contents: 60-70% of amino acids and 30-40% of modified montmorillonite, the amino acids are alanine, and the modified montmorillonite is organic montmorillonite or carbon dot montmorillonite; the method specifically comprises the following steps: configuring alanine into an alanine aqueous solution, mixing the alanine aqueous solution with organic montmorillonite or carbon dot montmorillonite, heating and stirring, suction filtration and drying, so as to obtain the gas phase corrosion inhibitor. Compared with the prior art, the amino acid type gas phase corrosion inhibitor is compounded with montmorillonite by utilizing the characteristics of the montmorillonite, such as rich pores, large specific surface area and fine granularity, so that the volatilization capacity and corrosion inhibition performance of the amino acid type gas phase corrosion inhibitor are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of corrosion inhibitors for preventing and stopping metal corrosion, and relates to an amino acid-based vapor phase corrosion inhibitor, its preparation method, and its application. Background Technology

[0002] Atmospheric corrosion is a widespread form of corrosion, accounting for more than half of all corrosion losses. In the past, traditional rust-preventive packaging processes using rust-preventive oils were cumbersome and costly, requiring the removal of grease from metal surfaces with organic solvents before opening. This method is increasingly being limited. Vapor-phase corrosion inhibitors (VCIs), also known as volatile corrosion inhibitors, are chemicals that release corrosion-inhibiting gases at room temperature and adsorb onto metal surfaces, effectively preventing metal corrosion. VCIs are convenient, clean, and easy to use, making them an important direction in the development of atmospheric corrosion prevention technologies. However, the use of VCIs has raised concerns in the scientific community about their environmental impact. Many VCI formulations, such as dicyclohexylamine nitrite (DICHAN) and cyclohexylamine carbonate (CHC), do not meet current ecological requirements. Concerns about environmental sustainability are driving the search for environmentally friendly corrosion inhibitors, such as natural extracts, amino acids, and surfactants.

[0003] Chinese invention patent CN109868477A discloses a vapor-phase corrosion inhibitor and its preparation method. Although this method can effectively inhibit corrosion from carbon dioxide, hydrogen sulfide, salts, bacteria, etc., and can effectively solve the corrosion problems of carbon dioxide and hydrogen sulfide humid media under different working conditions, most of these vapor-phase rust inhibitors contain toxic and harmful substances such as nitrites. Chinese invention patent CN109868477A also discloses a vapor-phase corrosion inhibitor and its preparation method, which prepares a rust-proof plastic film by mixing non-polar amino acids, benzotriazole, carrier plastics, and additives in a certain proportion. Although this patent solves the problems of deteriorated appearance and decreased rust-proof performance of the plastic film, benzotriazole inevitably brings environmental pollution problems.

[0004] Amino acids are characterized by being environmentally friendly, readily soluble in water, non-toxic, and low-cost. Furthermore, due to the presence of two polar groups (amino and carboxyl), amino acids can form coordination compounds with metal ions. Amino acids have attracted widespread attention in the development of green corrosion inhibitors. It has been reported that numerous studies, both domestic and international, have investigated thousands of studies on the use of 20 different amino acids as corrosion inhibitors in the liquid phase. Results show that most amino acids exhibit good corrosion inhibition performance on aluminum alloys, copper, and low-carbon steel in solution. Although amino acids demonstrate excellent corrosion inhibition performance in solution, their high molecular polarity and low volatility have prevented the development of amino acid compounds as gas-phase corrosion inhibitors.

[0005] Patent CN1986890A discloses a method for preparing a vapor-phase corrosion inhibitor, comprising the following steps: a. dispersing montmorillonite in deionized water, slurrying, stirring, then adding morpholine to the suspension, heating to evaporate the solution and precipitate crystals; b. adding formaldehyde to the solution from step a, allowing it to stand, adding dicyclohexylamine, allowing it to stand, then adding a mixed solution of benzoic acid and acetone to the solution, allowing it to stand to form a white slurry, finally dispersing the slurry in deionized water, filtering, and drying at 80°C to obtain the target product. However, the modified montmorillonite used in this patent is a traditional alkyl long-chain, which increases the interlayer space of montmorillonite while reducing the adsorption sites on the montmorillonite surface; the reagents used include morpholine, dicyclohexylamine, and formaldehyde, all of which are toxic reagents and will cause environmental pollution problems.

[0006] Patent CN111270242A discloses an environmentally friendly vapor-phase corrosion inhibitor and its preparation method. The environmentally friendly vapor-phase corrosion inhibitor comprises, in first parts by weight, the following components: 10-20 parts of an integrated slow-release material, 5-10 parts of phosphoric acid, 5-10 parts of amino acids, 1-5 parts of surfactant, 3-5 parts of phytic acid, 10-20 parts of urea, 1-5 parts of flavonoids, 5-10 parts of sodium gluconate, and 100-150 parts of deionized water. The integrated slow-release material comprises, in second parts by weight, the following components: 15-30 parts of dopamine, 100-200 parts of N,N-dimethylformamide, 5-10 parts of N,N'-carbonyldiimidazole, 5-10 parts of triethylamine, and 6-12 parts of acetic acid. However, the carrier of this patented vapor-phase corrosion inhibitor is a reaction precipitate, requiring numerous reagents and complex synthesis methods, resulting in high costs.

[0007] Patent CN114875411A discloses a pitch-based carbon point corrosion inhibitor, its preparation method, and its application. This preparation method uses coal tar pitch as a precursor and cetyltrimethylammonium bromide, sodium dodecylbenzenesulfonate, or polyvinylpyrrolidone surfactant as a passivating and dispersing agent, obtaining the carbon point corrosion inhibitor via a one-step hydrothermal method. However, this patent prepares a pitch carbon point liquid-phase corrosion inhibitor, which has limited applications and is cumbersome. Summary of the Invention

[0008] The purpose of this invention is to overcome at least one defect of the prior art and provide an amino acid-based vapor phase corrosion inhibitor, its preparation method and application. This invention utilizes the characteristics of montmorillonite, such as abundant pores, large specific surface area and fine particle size, to combine montmorillonite with a green amino acid-based vapor phase corrosion inhibitor, thereby improving the volatility and corrosion inhibition performance of the amino acid-based vapor phase corrosion inhibitor.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] One of the technical solutions of the present invention is to provide an amino acid-based vapor phase corrosion inhibitor, which includes amino acids and montmorillonite. The vapor phase corrosion inhibitor comprises the following mass percentage contents: 60-70% amino acids and 30-40% modified montmorillonite. The amino acid is alanine, and the modified montmorillonite is organomontmorillonite or carbon dot montmorillonite.

[0011] One of the technical solutions of the present invention is to provide a method for preparing an amino acid-based vapor phase corrosion inhibitor. The method specifically involves: preparing an alanine aqueous solution, mixing it with organomontmorillonite or carbon dot montmorillonite, heating and stirring, filtering, and drying to obtain the vapor phase corrosion inhibitor.

[0012] Furthermore, the alanine aqueous solution has a mass fraction of 10-20%.

[0013] Furthermore, the heating temperature is 50-60℃ and the time is 4-6 hours, and the drying temperature is 80-90℃ and the time is 24-36 hours.

[0014] Furthermore, the method for preparing the organomontmorillonite is as follows: dispersing montmorillonite in water and stirring, taking the upper suspension after standing, adding an aqueous solution of a cationic surfactant, heating and stirring, cooling to room temperature, filtering, and drying to obtain organomontmorillonite.

[0015] Furthermore, the cationic surfactant is hexadecyltrimethylammonium bromide, the mass ratio of montmorillonite to cationic surfactant is 1:(0.4-0.8), the mass fraction of the montmorillonite-water mixture is 5-10%, and the mass fraction of the cationic surfactant aqueous solution is 30-40%.

[0016] Furthermore, the dispersion time is 24-36 hours, the settling time is 24-36 hours, the heating temperature is 60-80°C for 1-2 hours, and the drying temperature is 80-90°C for 24-48 hours.

[0017] Furthermore, the method for preparing carbon dot montmorillonite specifically involves: dispersing organic montmorillonite in water and stirring, allowing it to stand, taking the upper suspension, transferring it to a reaction vessel, heating it under vacuum, cooling it to room temperature, filtering it, and drying it to obtain carbon dot montmorillonite.

[0018] Furthermore, the mass fraction of the organic montmorillonite aqueous mixture is 5-10%, the dispersion time is 24-36 hours, the standing time is 24-36 hours, the vacuum heating temperature is 120-150°C, the vacuum degree is 20-30 kPa, and the time is 4-12 hours, and the drying temperature is 80-90°C for 24-48 hours.

[0019] One of the technical solutions of the present invention is to provide an application of an amino acid-based vapor phase corrosion inhibitor, which is used to inhibit metal corrosion, wherein the metal includes carbon steel, copper or aluminum.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) In this invention, montmorillonite is added to amino acid-based gas phase corrosion inhibitors. The porous carrier of montmorillonite is used as a template to change the aggregation state and thermal stability of amino acid-based gas phase corrosion inhibitors, thereby improving the volatility performance and gas phase corrosion inhibition ability of the gas phase corrosion inhibitors.

[0022] (2) This invention utilizes the cation exchange principle in montmorillonite sheets to exchange amino acid-based gas phase corrosion inhibitor molecules into the silicate sheets of montmorillonite, thereby combining the silicate sheets with the gas phase corrosion inhibitor and improving the dispersion of amino acids. Ordinary montmorillonite has a small layer space, porosity and specific surface area, which cannot effectively disperse gas phase corrosion inhibitors. However, the modified organomontmorillonite and carbon dot montmorillonite of this invention have a larger layer space and specific surface area, which is beneficial to the dispersion of gas phase corrosion inhibitors, thereby improving the volatility of amino acid-based gas phase corrosion inhibitors. Attached Figure Description

[0023] Figure 1 This is a comparison diagram of the volatilization reduction experiment of amino acid-based vapor phase corrosion inhibitors in a closed space in the embodiments of the present invention and Comparative Example 2;

[0024] Figure 2 The figure shows the experimental results of the vapor phase corrosion inhibition capability of the carbon steel specimen in Comparative Example 1 of this invention.

[0025] Figure 3 The figure shows the experimental results of the vapor phase corrosion inhibition capability of the carbon steel specimen in Comparative Example 2 of this invention.

[0026] Figure 4 This is a graph showing the experimental results of the vapor phase corrosion inhibition capability of the carbon steel specimen in Example 1 of the present invention;

[0027] Figure 5This is a graph showing the experimental results of the vapor phase corrosion inhibition capability of the carbon steel specimen in Example 2 of the present invention;

[0028] Figure 6 This is a comparison diagram of the vapor phase rust prevention identification experiment of carbon steel specimens in the embodiments and comparative examples of the present invention;

[0029] Figure 7 These are simulated corrosion polarization curve test diagrams of carbon steel electrodes in the embodiments and comparative examples of the present invention;

[0030] Figure 8 The Nyquist test results for simulated corrosion of carbon steel electrodes in the embodiments and comparative examples of this invention are shown below.

[0031] Figure 9 This is a scanning electron microscope (SEM) image of the carbon steel specimen in Comparative Example 1 of the present invention after the vapor phase corrosion inhibition test.

[0032] Figure 10 This is a SEM image of the carbon steel specimen in Comparative Example 2 of this invention after the vapor phase corrosion inhibition test.

[0033] Figure 11 This is a SEM image of the carbon steel specimen in Example 1 of the present invention after the vapor phase corrosion inhibition test;

[0034] Figure 12 This is a SEM image of the carbon steel specimen in Example 2 of the present invention after the vapor phase corrosion inhibition test. Detailed Implementation

[0035] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0036] Unless otherwise specified, the equipment used in the following embodiments is conventional equipment in the art; unless otherwise specified, the reagents used are commercially available products or prepared by conventional methods in the art. In the following embodiments, unless otherwise described in detail, conventional experimental methods in the art can be used.

[0037] Example 1:

[0038] An amino acid-based vapor phase corrosion inhibitor and its preparation method, the specific steps of which are as follows:

[0039] 10g of montmorillonite was dispersed in deionized water, with a montmorillonite-water mixture having a mass fraction of 5%. After stirring for 24 hours, the mixture was allowed to stand for 24 hours, and the upper suspension was collected for later use. 4g of hexadecyltrimethylammonium bromide was weighed and prepared into an aqueous solution. The suspension was then added to a 30% hexadecyltrimethylammonium bromide aqueous solution at 60°C, heated and stirred for 1 hour, cooled to room temperature, filtered, and dried in an oven at 80°C for 24 hours to obtain 8g of organomontmorillonite (OMT). 2g of alanine (ALA) was weighed and prepared into an aqueous solution. 1g of organomontmorillonite was added to a 10% alanine aqueous solution, heated and stirred at 50°C for 4 hours, filtered, and dried in an oven at 80°C for 24 hours to obtain the vapor phase corrosion inhibitor OMT-ALA.

[0040] Example 2:

[0041] An amino acid-based vapor phase corrosion inhibitor and its preparation method, the specific steps of which are as follows:

[0042] 1g of the organomontmorillonite prepared in Example 1 was weighed and dispersed in deionized water. The mass fraction of the organomontmorillonite-water mixture was 5%. After stirring for 24 hours, it was allowed to stand for 24 hours. The upper suspension was taken for later use. The suspension was transferred to a hydrothermal reactor and vacuum heated at 120°C and 30kPa for 4 hours. After cooling to room temperature, it was filtered and dried in an oven at 80°C for 24 hours to obtain carbon dot montmorillonite (DMT). 2g of alanine was weighed and prepared into an aqueous solution. The organomontmorillonite was added to the 10% alanine aqueous solution. After heating and stirring at 50°C for 4 hours, it was filtered and dried in an oven at 80°C for 24 hours to obtain the vapor phase corrosion inhibitor DMT-ALA.

[0043] Comparative Example 1:

[0044] No corrosion inhibitors were used on the carbon steel test pieces.

[0045] Comparative Example 2:

[0046] An amino acid-based corrosion inhibitor and its preparation method are disclosed. Specifically, 2g of alanine is weighed and dissolved to prepare a 10% alanine aqueous solution, which yields the corrosion inhibitor ALA.

[0047] The following are the specific steps of the closed-space volatilization reduction experiment conducted on Examples 1 and 2 and Comparative Example 2:

[0048] Weigh 1g of corrosion inhibitor and place it in a 5cm diameter petri dish, spread it evenly, and place it in a 50℃ oven for 72 hours. Weigh it every 24 hours and calculate the weight loss rate.

[0049] Vapor phase corrosion inhibitors are generally used in confined spaces. They possess a suitable vapor pressure at room temperature, allowing them to quickly adsorb onto metal surfaces and thus inhibit corrosion. Vapor phase corrosion inhibitors with high vapor pressure can quickly adsorb onto metal surfaces and effectively inhibit metal corrosion, but their long-term protective effect is poor. Vapor phase corrosion inhibitors with low vapor pressure have a more durable rust-preventing effect, but are not conducive to inhibiting early rusting of metals. Volatility is an important performance indicator of vapor phase corrosion inhibitors, and their vaporization performance can be indirectly compared through volatilization loss tests.

[0050] like Figure 1 As shown, the rate of weight loss due to volatilization of the vapor phase corrosion inhibitors OMT-ALA and DMT-ALA gradually increases with time over 72 hours. The experimental results show that the initial weight loss due to volatilization of DMT-ALA is significantly greater than that of OMT-ALA, indicating that DMT-ALA can increase the volatilization capacity of the vapor phase corrosion inhibitor, thereby effectively inhibiting early metal corrosion. The higher weight loss due to volatilization of the vapor phase corrosion inhibitor in this embodiment compared to ALA indicates that the vapor phase corrosion inhibitor in this embodiment has good volatilization performance and effectively inhibits metal corrosion.

[0051] The vapor phase corrosion inhibition capability experiments were conducted on Examples 1 and 2 and Comparative Example 2. The specific steps are as follows:

[0052] Press the concave surface of the polished low-carbon steel test piece into a No. 9 rubber stopper, ensuring that the exposed portion of the test surface does not exceed 3 mm. After pressing, degrease the test surface of the carbon steel test piece with anhydrous ethanol and dry it with hot air. The experimental setup conforms to the Ministry of Machinery standard JB / T 6071-92. Pour 10 mL of a 35% glycerol aqueous solution into the bottom of a 1000 mL wide-mouth bottle and adjust the relative humidity to 90%. Sprinkle 0.5 g of corrosion inhibitor evenly in a 40±2 mm diameter container. Place the experimental setup at 20±2℃ for 20 hours. Then, fill the aluminum tube with cold water at 20±0.5℃ and maintain it at 20±2℃ for another 3 hours before pouring it out. Wipe the carbon steel test piece with cotton soaked in anhydrous ethanol, dry it, and check for rust on the surface of the carbon steel test piece.

[0053] like Figures 2 to 5 As shown, the corrosion area of ​​the test pieces treated with vapor phase corrosion inhibitors OMT-ALA and DMT-ALA was significantly reduced, with OMT-ALA and DMT-ALA achieving corrosion inhibition efficiencies of 86% and 99%, respectively. Visual inspection according to the standards for volatile corrosion inhibition tests revealed that the DMT-ALA-treated test piece had only one small corrosion spot and the smallest corrosion area, indicating that DMT-ALA had the best corrosion inhibition effect; the test pieces treated with OMT-ALA and DMT-ALA were bright in almost all areas.

[0054] Vapor phase corrosion inhibitor identification experiments were conducted on Examples 1 and 2, as well as Comparative Examples 1 and 2. The specific steps are as follows:

[0055] Place a weighing bottle containing 1g of corrosion inhibitor into an Erlenmeyer flask, and hang two pieces of No. 10 low carbon steel (50mm×25mm×2mm) on it. One piece is used as a control example without corrosion inhibitor. The flask is kept at a constant temperature of 50℃ for 2 hours. Then, 15mL of deionized water is injected through a pipette. The flask is placed in a constant temperature incubator and kept at 50℃. The flask is heated for 8 hours every day. Each 24-hour period is one cycle. The flask is observed once a day for a total of 7 cycles.

[0056] like Figure 6 As shown, the vapor phase corrosion inhibitors OMT-ALA and DMT-ALA exhibit effective corrosion protection for carbon steel under cyclic moisture condensation conditions. Specifically, OMT-ALA shows a corrosion rate and inhibition efficiency of 0.0826 g·m⁻¹. -2 ·h -1 The corrosion rate and inhibition efficiency of DMT-ALA were 78.1% and 0.0512 g·m⁻¹, respectively. -2 ·h -1 And 80.7%. The corrosion inhibition efficiency of the vapor phase corrosion inhibitor in this embodiment can reach more than 75% after 7 cycles.

[0057] Electrochemical polarization curves and impedance measurements of carbon steel electrodes in simulated atmospheric corrosion solutions were performed for Examples 1 and 2, as well as Comparative Examples 1 and 2. The specific steps are as follows:

[0058] Electrochemical polarization curves and impedance measurements were performed on a three-electrode system. A saturated calomel electrode (SCE) was used as the reference electrode, a platinum electrode as the auxiliary electrode, and a low-carbon steel electrode as the working electrode. The given potentials are relative to the saturated calomel electrode. Simulated atmospheric corrosion water (solutes of 0.1 g / L sodium chloride, 0.1 g / L sodium bicarbonate, and 0.1 g / L sodium sulfate) was used as the electrolyte solution. The carbon steel electrode was encapsulated in epoxy resin, with an exposed area of ​​1 cm². 2 The carbon steel electrode was polished stepwise with metallographic sandpaper, degreased with anhydrous ethanol, and rinsed thoroughly with deionized water. A 100mL beaker was placed in which a glass dish containing 0.5g of corrosion inhibitor was placed. The polished surface of the carbon steel electrode was placed downwards, 5cm above the lid, and then placed in a 50℃ oven for 24 hours to promote film formation of the corrosion inhibitor on the carbon steel surface. Electrochemical tests were performed on a Solartron 1287 / 1260 Electrochemical Interface testing system, with a scan range of ±300mV relative to the open circuit potential and a scan rate of 1mV / s. Electrochemical impedance spectroscopy was performed at a frequency of 10... -2 -10 5 Hz, the impedance measurement signal amplitude is a 5mV sine wave.

[0059] like Figure 7 As shown, I corr It is decreasing, E corr Move in the positive direction. For example... Figure 8 As shown, all capacitance arcs exhibit a slender shape. The impedance arcs of electrodes treated with DMT-ALA and OMT-ALA are larger than those of electrodes treated with ALA, and the capacitance arc of the DMT-ALA-treated electrode is significantly larger than that of other electrodes. This is because the addition of DMT can better alter the aggregation state of the vapor-phase corrosion inhibitor, thereby increasing the volatility of the vapor-phase corrosion inhibitor. This leads to more vapor-phase corrosion inhibitor molecules adsorbing onto the surface of the carbon steel electrode, increasing the electrochemical impedance of the carbon steel electrode. Therefore, DMT-ALA has a better corrosion inhibition effect.

[0060] SEM surface analysis was performed on Examples 1 and 2, as well as Comparative Examples 1 and 2. The results are as follows:

[0061] like Figures 9 to 12 As shown, after the vapor phase corrosion inhibition (VIA) test, significant corrosion was observed on both the bare low-carbon steel specimen and the specimen treated with ALA. When the specimens were treated with OMT-ALA and DMT-ALA, corrosion was significantly inhibited, and scratches from the pretreatment process before the corrosion test were still visible. This confirms that OMT-ALA and DMT-ALA have outstanding vapor phase corrosion inhibition effects on low-carbon steel. Clearly, the specimen treated with DMT-ALA showed better results.

[0062] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An amino acid-based vapor phase corrosion inhibitor, characterized in that, The vapor phase corrosion inhibitor comprises amino acids and montmorillonite, and the vapor phase corrosion inhibitor comprises the following mass percentage content: 60-70% amino acids and 30-40% modified montmorillonite, wherein the amino acid is alanine and the modified montmorillonite is organomontmorillonite or carbon dot montmorillonite. The method for preparing the amino acid-based vapor phase corrosion inhibitor is as follows: alanine is prepared into an alanine aqueous solution, mixed with organomontmorillonite or carbon dot montmorillonite, heated and stirred, filtered, and dried to obtain the vapor phase corrosion inhibitor. The specific method for preparing the organo-montmorillonite is as follows: montmorillonite is dispersed in water and stirred. After standing, the upper suspension is taken, an aqueous solution of a cationic surfactant is added, the mixture is heated and stirred, cooled to room temperature, filtered, and dried to obtain organo-montmorillonite. The specific method for preparing carbon dot montmorillonite is as follows: organic montmorillonite is dispersed in water and stirred. After standing, the upper suspension is taken, transferred to a reaction vessel, heated under vacuum, cooled to room temperature, filtered, and dried to obtain carbon dot montmorillonite.

2. The amino acid-based vapor phase corrosion inhibitor according to claim 1, characterized in that, In the preparation method of the amino acid-based vapor phase corrosion inhibitor, the alanine aqueous solution has a mass fraction of 10-20%.

3. The amino acid-based vapor phase corrosion inhibitor according to claim 1, characterized in that, In the preparation method of the amino acid-based vapor phase corrosion inhibitor, the heating temperature is 50-60 ℃ and the time is 4-6 h, and the drying temperature is 80-90 ℃ and the time is 24-36 h.

4. The amino acid-based vapor phase corrosion inhibitor according to claim 1, characterized in that, In the preparation method of the organomontmorillonite, the cationic surfactant is hexadecyltrimethylammonium bromide, the mass ratio of montmorillonite to cationic surfactant is 1:(0.4-0.8), the mass fraction of the montmorillonite aqueous mixture is 5-10%, and the mass fraction of the cationic surfactant aqueous solution is 30-40%.

5. The amino acid-based vapor phase corrosion inhibitor according to claim 1, characterized in that, In the preparation method of the organomontmorillonite, the dispersion time is 24-36 h, the standing time is 24-36 h, the heating temperature is 60-80 ℃ for 1-2 h, and the drying temperature is 80-90 ℃ for 24-48 h.

6. The amino acid-based vapor phase corrosion inhibitor according to claim 1, characterized in that, In the preparation method of carbon dot montmorillonite, the mass fraction of the organic montmorillonite aqueous mixture is 5-10%, the dispersion time is 24-36 h, the standing time is 24-36 h, the vacuum heating temperature is 120-150 ℃, the vacuum degree is 20-30 kPa, and the time is 4-12 h, and the drying temperature is 80-90 ℃, and the time is 24-48 h.

7. An application of the amino acid-based vapor phase corrosion inhibitor as described in claim 1, characterized in that, This vapor phase corrosion inhibitor is used to suppress metal corrosion, including carbon steel, copper, or aluminum.

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