Radiation-resistant vapor phase corrosion inhibitor as well as preparation method and application thereof

Abstract

The invention discloses an irradiation-resistant vapor phase corrosion inhibitor and a preparation method and application thereof, and relates to the field of metal protection in special environments, and the vapor phase corrosion inhibitor comprises the following components in parts by weight: 20-50 parts of a main corrosion inhibitor, 10-30 parts of a synergistic corrosion inhibitor, 5-15 parts of a metal deactivator, 10-25 parts of an irradiation stabilizer and the balance of a carrier and a dispersant. The main corrosion inhibitor is prepared through efficient enamine synthesis reaction of aromatic aldehyde or aromatic aldehyde compounds and morpholine under the catalysis of organic acid. According to the vapor phase corrosion inhibitor, through the synergistic effect of all the components, the vapor phase corrosion inhibitor exerts excellent vapor phase anti-rust performance, meanwhile, the molecular structure of the vapor phase corrosion inhibitor can effectively resist damage of high-energy irradiation such as gamma rays, and long-term stability is kept. The product can be prepared into various forms such as powder, tablets and the like, and is specially used for protecting metal products in strong irradiation environments such as nuclear power stations, nuclear waste treatment facilities and the like from being corroded.

Description

Technical Field

[0001] This invention relates to the field of metal protection under special environments, specifically to a radiation-resistant vapor phase corrosion inhibitor, its preparation method, and its application. Background Technology

[0002] Vapor phase corrosion inhibitors (VCIs) are chemical substances that automatically evaporate at room temperature and adsorb onto metal surfaces to form a protective film, thereby preventing atmospheric corrosion of the metal. They are widely used in the packaging and long-term storage of instruments, equipment, electronic components, etc.

[0003] However, in special environments such as nuclear power plants, nuclear waste storage, and nuclear waste treatment, equipment and metal components are subjected to high-energy radiation such as gamma rays for extended periods. Traditional vapor phase corrosion inhibitors (VCIs) experience chemical bond breakage and molecular structure degradation under strong radiation, leading to a rapid loss of their corrosion inhibition properties. They may even decompose to produce acidic or oxidizing substances, thus accelerating metal corrosion. Currently, there is a severe shortage of vapor phase corrosion inhibitors on the market that can withstand strong radiation environments and maintain stable corrosion inhibition performance over the long term.

[0004] Therefore, developing a vapor phase corrosion inhibitor that combines excellent radiation resistance, high corrosion inhibition efficiency, and environmental friendliness is of great practical significance and has an urgent market demand. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a vapor phase corrosion inhibitor with high corrosion inhibition efficiency, excellent radiation resistance, and long service life.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned vapor phase corrosion inhibitor.

[0007] Another object of the present invention is to provide the application of the above-mentioned vapor phase corrosion inhibitor.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a radiation-resistant vapor phase corrosion inhibitor, comprising the following components by weight (based on a total weight of 100 parts): Main corrosion inhibitor: 20-50 parts, wherein the main corrosion inhibitor is an enamine morpholine derivative, prepared by the Stork enamine synthesis reaction of aldehyde compounds and morpholine, with the general formula as follows: In this invention, R represents the remaining structural fragment of the aldehyde compound molecule after removing the aldehyde group (-CHO). Preferably, the aldehyde compound is an aromatic aldehyde or an aromatic aldehyde group. When the original aldehyde compound is an aromatic aldehyde, its aromatic ring will be transformed into the corresponding structure due to the reconstruction of the double bonds during the reaction. Taking benzaldehyde as an example, its aromatic ring will be transformed into the corresponding cyclohexadiene structure due to the reconstruction of the double bonds during the reaction. The aromatic aldehydes mentioned in this invention refer to aldehyde compounds in which the carbonyl carbon in the aldehyde group is directly connected to the aromatic ring. The aromatic ring includes aromatic cyclic structures such as benzene rings and naphthalene rings, as well as aromatic heterocyclic structures such as furan rings and pyridine rings. The aromatic aldehyde compounds refer to compounds in which the aldehyde group and the aromatic ring are connected by a carbon chain, such as phenylacetaldehyde and cinnamaldehyde.

[0009] Preferably, the aldehyde compounds of the present invention are one or more selected from benzaldehyde, phenylacetaldehyde, salicylaldehyde, cinnamaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde, and furan-2-carboxaldehyde.

[0010] Synergistic corrosion inhibitor: 10-30 parts, wherein the synergistic corrosion inhibitor is one or more of organic amines, heterocyclic compounds, organic acids, amine salts, and esters as vapor phase corrosion inhibitors; preferably, it is one or more of urea, hexamethylenetetramine, and benzoic acid in any proportion; more preferably, it is a mixture of benzoic acid and hexamethylenetetramine in a weight ratio of 1:5 to 1:3.

[0011] Metal passivating agent: 5-15 parts, wherein the metal passivating agent is an inorganic passivating agent or a compound thereof, wherein the inorganic passivating agent is selected from one or more of phosphate, molybdate, tungstate, titanium zirconium salt, and silicate compounds; preferably, sodium molybdate, sodium tungstate, and sodium phosphate, or a combination of two or more of them in any proportion.

[0012] Radiation stabilizer: 10-25 parts, wherein the radiation stabilizer is one or more of hindered phenolic antioxidants, aromatic compounds, and polyarylether ketones in any proportion; wherein the hindered phenolic antioxidant is selected from 2,6-di-tert-butyl-p-cresol, Irganox 1010 (pentaerythritol tetra-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), and Irganox 1076 (β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate). The aromatic compounds are selected from biphenyl, terphenyl, tetraphenyl, and 1,1'-binaphthyl propionate; antioxidant 2246 (2,2'-methylenebis(6-tert-butyl-4-methylphenol)); antioxidant 1035 (dithiodiethylene glycol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]); antioxidant 330 (1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene); and antioxidant 1726 (2,4-di(dodecylthiomethyl)-6-methylphenol).

[0013] Preferably, the radiation stabilizer is one or a combination of two or more of biphenyl, terphenyl, and 2,6-di-tert-butyl-p-cresol in any proportion. More preferably, the radiation stabilizer is a mixture of biphenyl and 2,6-di-tert-butyl-p-cresol in a weight ratio of 1:1 to 3:1.

[0014] Carrier and dispersant: balance up to 100 parts, wherein the carrier and dispersant are one or more of diatomaceous earth, molecular sieve, bentonite, and silica aerogel with a particle size of 10μm-100μm.

[0015] This invention also provides a method for synthesizing the primary corrosion inhibitor, comprising the following steps: Add sufficient ethanol to the reaction vessel as the reaction medium. Weigh the aldehyde compound and morpholine in a molar ratio of 1:1 to 1:1.5 and dissolve them completely in ethanol. Under inert gas protection (such as nitrogen or argon), slowly add 0.5%-5% of an organic acid as a catalyst, accounting for 0.5%-5% of the total mass of the reactants. Carry out the Stork enamine synthesis reaction at a constant temperature of 70℃-95℃ for 4-12 hours.

[0016] Post-processing steps for the crude product: After the reaction is complete, the reaction solution is concentrated using a rotary evaporator, resulting in the precipitation of a small amount of solid. After cooling to room temperature, a large amount of crude solid product is obtained. The product is filtered and washed 2-4 times with pre-cooled anhydrous ethanol. Subsequently, it is vacuum dried at 40℃-60℃ for 2-4 hours, and finally ground to obtain a powdered product.

[0017] Preferably, the organic acid is one or a combination of two or more of acetic acid, propionic acid, p-toluenesulfonic acid, and trifluoroacetic acid in any proportion.

[0018] The core concept of this invention lies in: 1. Innovative design of the main agent's molecular structure: An enamine morpholine derivative, prepared by reacting aromatic aldehydes or aromatic aldehyde compounds with morpholine, is designed as the primary corrosion inhibitor. Its aromatic ring and conjugated structure possess radiation energy absorption and dispersion capabilities, while the morpholine group endows the system with excellent gas-phase corrosion inhibition performance and metal coordination ability. This molecular framework also exhibits intrinsic stability, demonstrating a significant intrinsic radiation resistance advantage compared to traditional small-molecule VCIs.

[0019] 2. Construct a multi-layered, collaborative, and stable system: A specific radiation stabilizer was introduced to construct a multi-layered synergistic stabilization system. This stabilizer preferentially absorbs irradiation energy and, through its own molecular resonance, energy transfer, or free radical capture mechanisms, synergizes with the aromatic structure of the main corrosion inhibitor, further preventing the active groups from being damaged by high-energy rays. Specifically, the aromatic compounds, through their conjugated π-bond structure, effectively disperse and absorb irradiation energy; the hindered phenolic antioxidants can capture irradiation-induced free radicals, interrupting the degradation chain reaction. The synergistic effect of these components together constructs a corrosion inhibition system that remains stable even under strong irradiation.

[0020] Secondly, the present invention provides a method for preparing the above-mentioned radiation-resistant vapor phase corrosion inhibitor, comprising the following steps: (1) Synthesize the main corrosion inhibitor and pulverize it to the required particle size. Then, dissolve the main corrosion inhibitor, synergistic corrosion inhibitor and metal passivator in ethanol or deionized water at 50℃-70℃ to form a homogeneous solution A; (2) Add the irradiation stabilizer to solution A, stir continuously and heat to 70℃-80℃ to fully disperse or dissolve it, and obtain mixture B; (3) Preheat the carrier and dispersant to 60℃-70℃, and under high-speed stirring, slowly and evenly spray the mixture B onto the carrier and dispersant to ensure full adsorption; (4) The fully adsorbed product is vacuum dried at 80℃-100℃ for 2-4 hours, cooled, pulverized and sieved to obtain a powder or granular radiation-resistant vapor phase corrosion inhibitor product.

[0021] Preferably, in step (1), the synthesis and purification method of the main corrosion inhibitor is as follows: Ethanol is added to the reaction vessel as the reaction medium. Aldehyde compounds and morpholine are weighed at a molar ratio of 1:1 to 1:1.5 and dissolved completely in ethanol. Acetic acid, accounting for 0.5%-5% of the total mass of the reactants, is slowly added as a catalyst. The Stork enamine synthesis reaction is carried out at a constant temperature of 70℃-95℃ for 4-12 hours. After the reaction is completed, the reaction solution is concentrated, and a small amount of solid precipitates out. After cooling to room temperature, a large amount of crude solid product is obtained. The product is filtered and washed 2-4 times with pre-cooled anhydrous ethanol to remove residual unreacted raw materials. Then, it is vacuum dried at 40℃-60℃ for 2-4 hours, and finally ground to obtain a powdered product.

[0022] The aldehyde compounds are one or more of benzaldehyde, phenylacetaldehyde, salicylaldehyde, cinnamaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde, and furan-2-carboxaldehyde.

[0023] Preferably, in steps (1)-(4), based on 100 parts by weight: 20-50 parts of the main corrosion inhibitor, 10-30 parts of the synergistic corrosion inhibitor, 5-15 parts of the metal passivator, 10-25 parts of the irradiation stabilizer, and the remainder being the carrier and dispersant.

[0024] Thirdly, this invention provides the application of the above-mentioned radiation-resistant vapor phase corrosion inhibitor in protecting metal components or other metal products exposed to radiation environments, such as those in nuclear power plant equipment, nuclear waste storage tanks, and nuclear waste treatment facilities. Specific application methods include: (1) Prepare the vapor phase corrosion inhibitor into rust-preventive powder, tablets or granules and place them in a closed space or packaging. (2) The vapor phase corrosion inhibitor is blended with a polymer substrate (such as polyethylene or polypropylene) to make a rust-proof film or rust-proof bag; (3) The vapor phase corrosion inhibitor is prepared into a rust-preventive liquid and sprayed onto the metal surface.

[0025] The beneficial effects of this invention are: (1) The main corrosion inhibitor is an enamine morpholine derivative prepared by reacting aromatic aldehydes or aromatic aldehyde compounds with morpholine. Its molecular structure has both corrosion inhibition and radiation resistance properties, which fundamentally improves the core performance of the product.

[0026] (2) Through the dual protection mechanism of "intrinsic stable molecular structure" and "external stabilizer", the vapor phase corrosion inhibitor of the present invention exhibits excellent radiation resistance performance, with a cumulative absorbed dose reaching 8.5 × 10⁻⁶. 5 After γ-ray irradiation, Gy can still maintain a corrosion inhibition efficiency of over 95%, while traditional VCI has basically failed under the same conditions.

[0027] (3) The main corrosion inhibitor is combined with a variety of corrosion inhibitors to have excellent synergistic corrosion inhibition effect on a variety of metals such as copper, steel and aluminum, and has a high-efficiency broad-spectrum corrosion inhibition capability.

[0028] (4) The product components are stable and have moderate volatility, which can provide long-term and stable corrosion protection for metals in a closed space.

[0029] (5) It has flexible application forms and can be made into various forms such as powder, tablets, and films according to actual needs, to suit different application scenarios. Attached Figure Description

[0030] Figure 1 The infrared spectra of the main corrosion inhibitor compounds D and E synthesized in Examples 1-2 of this invention are shown.

[0031] Figure 2 The results show the corrosion inhibition ability test results of the vapor phase corrosion inhibitors prepared in Examples 1-2 and the comparative examples of the present invention; wherein, the blank is a metal test piece without corrosion inhibitor; and No. 1-3 are test pieces treated with vapor phase corrosion inhibitor. Detailed Implementation

[0032] The present invention will be further illustrated below with specific examples, but the scope of protection of the present invention is not limited to the following embodiments.

[0033] Example 1

[0034] A radiation-resistant vapor phase corrosion inhibitor, by weight (total weight 100 parts), is composed of the following components: 35 parts of main corrosion inhibitor D, 20 parts of synergistic corrosion inhibitor (benzoic acid: hexamethylenetetramine = 1:5, w / w), 10 parts of metal passivator (sodium molybdate), 20 parts of radiation stabilizer (biphenyl: 2,6-di-tert-butyl-p-cresol = 2:1, w / w), and 15 parts of carrier and dispersant (diatomaceous earth).

[0035] The specific steps for preparing the above-mentioned radiation-resistant vapor phase corrosion inhibitor are as follows: (1) Synthesis of the main corrosion inhibitor: 200 mL of anhydrous ethanol was added to a 500 mL three-necked flask equipped with a stirrer and a condenser as the reaction medium. Salicylic acid and morpholine were weighed in the three-necked flask at a molar ratio of 1:1.1 and stirred until completely dissolved. Then, under nitrogen protection, 0.5% glacial acetic acid (by mass of the total reactants) was slowly added dropwise as a catalyst. The reaction was refluxed at a set temperature of 95 °C for 8 hours. After the reaction was completed, the reaction solution was placed in a pear-shaped flask of a rotary evaporator and rotary evaporated at 60 °C for 1 hour. After rotary evaporation, the mixture was cooled to room temperature and allowed to stand in an ice-water bath for 1 hour, precipitating a large amount of solid. The solid was filtered and washed three times with pre-cooled anhydrous ethanol. The solid was then vacuum dried at 50 °C for 3 hours and ground to obtain the main corrosion inhibitor compound D.

[0036] (2) Dissolve 35 parts of compound D, 20 parts of synergistic corrosion inhibitor (benzoic acid: urotropine = 1:5, w / w) and 10 parts of sodium molybdate in ethanol at 55℃-60℃ to form a homogeneous solution A.

[0037] (3) Add 20 parts of the irradiation stabilizer (biphenyl: 2,6-di-tert-butyl-p-cresol = 2:1, w / w) to solution A, stir continuously and heat to 75°C to fully disperse or dissolve it, and obtain mixture B.

[0038] (4) Preheat 15 parts of diatomaceous earth to 60℃-65℃, and under high-speed stirring, slowly and evenly spray the mixture B onto the carrier and dispersant to ensure full adsorption.

[0039] (5) The fully adsorbed product is vacuum dried at 85°C for 3 hours, cooled, crushed and sieved to obtain the radiation-resistant vapor phase corrosion inhibitor product.

[0040] Example 2

[0041] A radiation-resistant vapor phase corrosion inhibitor, by weight (total weight 100 parts), is composed of the following components: 30 parts of main corrosion inhibitor E, 15 parts of synergistic corrosion inhibitor (urea), 8 parts of metal passivator (sodium tungstate), 15 parts of radiation stabilizer (terphenyl), and 32 parts of carrier and dispersant (molecular sieve).

[0042] The specific steps for preparing the above-mentioned radiation-resistant vapor phase corrosion inhibitor are as follows: (1) Synthesis of the main corrosion inhibitor: 200 mL of anhydrous ethanol was added to a 500 mL three-necked flask equipped with a stirrer and a condenser as the reaction medium. Phenylacetaldehyde and morpholine were weighed in the three-necked flask at a molar ratio of 1:1.1 and stirred until completely dissolved. Then, under nitrogen protection, 0.5% glacial acetic acid (by mass of the total reactants) was slowly added dropwise as a catalyst. The reaction was refluxed at a set temperature of 95 °C for 10 hours. After the reaction was complete, the reaction solution was placed in a rotary evaporator flask and rotary evaporated at 60 °C for 1 hour. After rotary evaporation, the mixture was cooled to room temperature and allowed to stand in an ice-water bath for 1 hour, precipitating a large amount of solid. The solid was filtered and washed five times with pre-cooled anhydrous ethanol. The solid was then vacuum dried at 40 °C for 3 hours and ground to obtain the main corrosion inhibitor compound E.

[0043] (2) Dissolve 30 parts of compound E, 15 parts of urea and 8 parts of sodium tungstate in ethanol at 55℃-60℃ to form a homogeneous solution A.

[0044] (3) Add 15 parts of terphenyl to solution A, stir continuously and heat to 75°C to fully disperse or dissolve it, and obtain mixture B.

[0045] (4) Preheat 32 parts of molecular sieve to 60℃-65℃, and under high-speed stirring, slowly and evenly spray the mixture B onto the carrier and dispersant to ensure full adsorption.

[0046] (5) The fully adsorbed product is vacuum dried at 85°C for 3 hours, cooled, crushed and sieved to obtain the radiation-resistant vapor phase corrosion inhibitor product.

[0047] Comparative Example A vapor phase corrosion inhibitor is prepared, the composition and ratio of which are basically the same as those in Example 1. The difference is that the main corrosion inhibitor in Example 1 is replaced with an equal amount of cyclohexylamine carbonate. The rest of the preparation method, process steps and parameters are the same as those in Example 1.

[0048] Characterization and performance testing: The infrared spectra of compounds D and E synthesized in Examples 1-2 above are as follows: Figure 1 As shown, from Figure 1 Analysis revealed that the range was 2817-2849 cm. -1Moderate absorption peaks with shoulder-like characteristics were observed within the range of 1446–1636 cm⁻¹, which are attributed to CN stretching vibrations. -1 The absorption peaks appearing within this range correspond to the stretching vibrations of the C=C bond. These peaks occur in the 1099-1115 cm⁻¹ range. -1 A strong absorption peak was observed at 1050-1200 cm⁻¹. -1 The region represents the characteristic peaks of the stretching vibrations of the COC bond. In summary, the characteristics of these peaks are consistent with the structural features of enamine compounds.

[0049] Radiation resistance test: The vapor phase corrosion inhibitor samples of Examples 1, 2 and the comparative examples were placed in Co 60 Under gamma irradiation, the cumulative dose received was 8.5 × 10⁻⁶. 5 Gy gamma ray irradiation.

[0050] Vapor phase corrosion inhibition ability test: Referring to the "Evaluation Method of Vapor Phase Corrosion Inhibitor Ability" in standard GB / T 35491-2017 "Corrosion Inhibitors - Vapor Phase Corrosion Inhibitors", three types of corrosion inhibitors were tested at 8.5 × 10⁻⁶. 5 The sample irradiated with Gy gamma rays was tested, and the test results are as follows: Figure 2 As shown.

[0051] Conclusion: According to the grade determination rules of GB / T 35491-2017, the test results show that after being subjected to strong radiation, the comparative vapor phase corrosion inhibitor product lost its protective ability against 10# steel, and its vapor phase corrosion inhibition ability was level 3 (corrosion area on the test piece surface > 50%). The vapor phase corrosion inhibitor products of Examples 1 and 2 of this invention still achieved the best level 0 in the national standard, demonstrating extremely excellent radiation resistance stability.

[0052] The vapor-phase corrosion inhibitor of this invention, through the synergistic effect of its components, not only exhibits excellent vapor-phase rust prevention performance, but its molecular structure also effectively resists damage from high-energy radiation such as gamma rays, maintaining long-term stability. This product can be formulated into various forms such as powder and tablets, and is specifically designed to protect metal products in high-radiation environments such as nuclear power plants and nuclear waste treatment facilities from corrosion.

Claims

1. A radiation tolerant gas phase corrosion inhibitor, characterized in that, The total weight is 100 parts by weight, including the following components: Main corrosion inhibitor: 20-50 parts; Synergistic corrosion inhibitor: 10-30 parts; Metal passivator: 5-15 parts; Radiation stabilizer: 10-25 parts; Carrier and dispersant: the balance to 100 parts; The main corrosion inhibitor is an enamine morpholine derivative prepared by Stork enamine synthesis reaction of an aldehyde compound and morpholine, and the general structure is wherein R represents a remaining structural fragment after removing an aldehyde group in the aldehyde compound molecule; when the original aldehyde compound is an aromatic aldehyde, the aromatic ring is converted into a corresponding structure due to the reconstruction of a double bond in the reaction. The synergistic corrosion inhibitor is one or more of organic amine, heterocyclic compound, organic acid, amine salt, and ester gas phase corrosion inhibitor; The metal passivator is one or more of phosphate, molybdate, tungstate, titanium-zirconium salt, and silicate compound; The radiation stabilizer is one or more of hindered phenolic antioxidant, aromatic compound, and polyaryletherketone; The carrier and dispersant are diatomite, molecular sieve, bentonite, and silica aerogel, or a combination of two or more thereof in any proportion.

2. The irradiation resistant gas phase corrosion inhibitor of claim 1, wherein, The aldehyde compound is one or more of benzaldehyde, phenylacetaldehyde, salicylaldehyde, cinnamyl aldehyde, p-methyl benzaldehyde, p-methoxy benzaldehyde, and furan-2-formaldehyde; and the synergistic corrosion inhibitor is one or a combination of urea, hexamethylene tetramine, and benzoic acid in any proportion.

3. The irradiation resistant gas phase corrosion inhibitor of claim 2, wherein, The synergistic corrosion inhibitor is a mixture of benzoic acid and hexamethylene tetramine in a weight ratio of 1:5 to 1:

3.

4. The irradiation resistant gas phase corrosion inhibitor of claim 1, wherein, The metal passivator is one or a combination of sodium molybdate, sodium tungstate, and sodium phosphate in any proportion; and the radiation stabilizer is one or a combination of biphenyl, terphenyl, and 2,6-di-tert-butyl-p-cresol in any proportion.

5. The irradiation resistant gas phase corrosion inhibitor of claim 4, wherein, The radiation stabilizer is a mixture of biphenyl and 2,6-di-tert-butyl-p-cresol in a weight ratio of 1:1 to 3:

1.

6. A process for the preparation of the radiaton resistant gas phase corrosion inhibitor as claimed in any one of claims 1 to 5, characterized in that, The method comprises the following steps: (1) dissolving the main corrosion inhibitor, the synergistic corrosion inhibitor, and the metal passivator to form a uniform solution A; wherein the main corrosion inhibitor is synthesized by the following steps: dissolving an aldehyde compound and morpholine in ethanol, performing Stork enamine synthesis reaction under constant temperature conditions in the presence of an organic acid catalyst, concentrating the reaction solution after the reaction is completed, and precipitating a solid; washing, drying, and obtaining the product; (2) adding the radiation stabilizer to the solution A, and stirring and mixing to obtain a mixed solution B; (3) spraying the mixed solution B onto a preheated carrier and dispersant, and fully adsorbing; (4) drying, cooling, crushing, and sieving the adsorbed product to obtain the product.

7. The production method according to claim 6, characterized by, In step (1), the aldehyde compound and morpholine are dissolved in ethanol in a molar ratio of 1:1 to 1:1.5, an organic acid is added as a catalyst, and Stork enamine synthesis reaction is performed under constant temperature conditions at 70-95°C; and the aldehyde compound is any one of benzaldehyde, phenylacetaldehyde, salicylaldehyde, cinnamyl aldehyde, p-methyl benzaldehyde, p-methoxy benzaldehyde, and furan-2-formaldehyde.

8. The preparation method according to claim 6, characterized in that, In step (1), the organic acid is one or a combination of acetic acid, propionic acid, p-toluenesulfonic acid, and trifluoroacetic acid in any proportion, and the amount of the organic acid added accounts for 0.5%-5% of the total mass of the reactants.

9. Use of the radiation-resistant gas phase corrosion inhibitor according to any one of claims 1-5 in the preparation of a product for protecting metal products in a radiation environment.

10. Use according to claim 9, characterized in that, The irradiation environment is the irradiation environment of nuclear power plants and nuclear waste treatment facilities, and the gas-phase corrosion inhibitor is used in the form of rust-proof powder, rust-proof sheet, rust-proof film or rust-proof spraying liquid.

Images