Thione metal surface corrosion inhibitor material, effect verification method and application

Abstract

The invention provides a thioketone metal surface corrosion inhibitor material, an effect verification method and application, and the thioketone metal surface corrosion inhibitor material is prepared by the following steps: dissolving a certain amount of 2-amino-5-sulfydryl-1, 3, 4-thiadiazole in a certain amount of solvent to obtain a solution; and then putting a certain amount of aldehyde group-containing compound into the solution to fully react. According to the thioketone metal surface corrosion inhibitor material provided by the invention, physical or chemical adsorption can be performed on the metal surface through functional groups in organic molecules, so that a layer of protective complex is formed, a corrosion reaction is blocked, and the erosion damage of an NTO energetic material to the surface of a metal container is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal corrosion prevention and control, and relates to thioketone metal surface corrosion inhibitor materials, effect verification methods and applications. Background Art

[0002] NTO energetic materials have attracted much attention for their high energy density and low sensitivity. High energy density means that more energy can be released per unit mass or volume, while low sensitivity reduces the risk of accidental explosion. This makes it more explosive in military and industrial applications, and enhances the safety of operation and storage to a certain extent. However, the acidic properties of NTO may cause surface corrosion problems of metal containers, so appropriate anti-corrosion measures must be taken to ensure safety and durability.

[0003] Organic corrosion inhibitors are an effective anti-corrosion tool that is environmentally friendly and safe, and are suitable for a variety of metals and application scenarios. Therefore, they have an important position and potential in the field of corrosion prevention. However, the existing technology is more about experimental exploration of organic corrosion inhibitor materials, and there is still a lack of in-depth research on corrosion inhibition materials containing organic compound components with certain types of functional groups, and exploration at the level of molecular structure and corrosion inhibition principles. There is a lack of specific means to solve the inhibition of metal surface corrosion by specific energetic materials (NTO). Summary of the invention

[0004] In view of this, the present invention provides thioketone-type metal surface corrosion inhibitor materials, effect verification methods and applications, wherein the thioketone-type metal surface corrosion inhibitor materials can change the interaction between organic molecules and metal surfaces, enhance the adsorption capacity of organic molecules on metal surfaces, easily form a protective layer on the metal surface or change the electrode properties of the metal surface, thereby effectively slowing down the progress of metal surface corrosion reactions.

[0005] In order to achieve the above effects, the first aspect of the present invention provides a thioketone metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of aldehyde-containing compound in the solution for sufficient reaction. The specific structure of the material is as follows:

[0006]

[0007] Optionally, the method comprises dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of aldehyde-containing compound into the solution for sufficient reaction, specifically comprising: the 2-amino-5-mercapto-1,3,4-thiadiazole is 1-5 mmol; the solvent is one of ultra-dry tetrahydrofuran, anhydrous ethanol or ethyl acetate, and the amount of the solvent is 10-30 mL; the aldehyde-containing compound is 1-10 mmol of 1,4-benzodioxane-6-carboxaldehyde; after placing a certain amount of aldehyde-containing compound into the solution, monitoring the reaction process by thin layer chromatography, and after the reaction is completed, placing the mixed solution at a certain temperature to precipitate a solid product of the thione metal surface corrosion inhibitor material.

[0008] The second aspect of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0009]

[0010] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is placed in the solution for sufficient reaction, specifically comprising: the 2-amino-5-mercapto-1,3,4-thiadiazole is 18-28 mmol; the solvent is one of acetone, trifluoroacetic acid or dichloromethane, and the amount of the solvent is 30-90 mL; the aldehyde-containing compound is 1-30 mmol of 1,4-benzodioxane-6-carboxaldehyde; after a certain amount of aldehyde-containing compound is placed in the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thione metal surface corrosion inhibitor material.

[0011] The third aspect of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0012]

[0013] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is placed in the solution for sufficient reaction, specifically comprising: the 2-amino-5-mercapto-1,3,4-thiadiazole is 8-15 mmol; the solvent is one of dimethylformamide, dimethyl sulfoxide and methanol, and the amount of the solvent is 10-50 mL; the aldehyde-containing compound is 1-15 mmol and the 4-pyridinecarboxaldehyde is 1-15 mmol; after a certain amount of aldehyde-containing compound is placed in the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thione metal surface corrosion inhibitor material.

[0014] The fourth aspect of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0015]

[0016] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is placed in the solution for sufficient reaction, specifically comprising: the 2-amino-5-mercapto-1,3,4-thiadiazole is 150-1500 mg; the solvent is one of chloroform, 2-methyltetrahydrofuran or tetrachloromethane, and the amount of the solvent is 10-30 mL; the aldehyde-containing compound is 200-2000 mg of dibenzofuran-4-carboxaldehyde; after a certain amount of aldehyde-containing compound is placed in the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

[0017] The fifth aspect of the present invention provides a method for verifying the effect of a thione-type metal surface corrosion inhibitor material, which is used to verify the corrosion inhibition effect of the thione-type metal surface corrosion inhibitor material, and includes the following specific steps: S1: adding the thione-type metal surface corrosion inhibitor material to a saturated NTO solution; S2: taking carbon steel and immersing it in the saturated NTO solution added with the thione-type metal surface corrosion inhibitor material as described in S1, and calculating the corrosion rate of the carbon steel; S3: setting a comparative example, and performing parameter comparison between the corrosion rate calculated in S2 and the comparative example to verify the corrosion inhibition effect of the thione-type metal surface corrosion inhibitor material.

[0018] Optionally, S3 specifically includes: the comparative example is set to directly immerse carbon steel in a saturated NTO solution without adding the thioketone metal surface corrosion inhibitor material, and test the corrosion rate.

[0019] A sixth aspect of the present invention provides an application of a thione-based metal surface corrosion inhibitor material in the field of metal corrosion prevention and control technology.

[0020] The present invention has at least the following beneficial effects:

[0021] (1) The thioketone metal surface corrosion inhibitor material provided by the present invention can form a complex with the metal surface through heteroatoms such as nitrogen and sulfur and unsaturated functional groups. The formation of this complex blocks the contact between the metal and the corrosive medium, and can reduce the corrosion of NTO on the metal surface.

[0022] (2) The corrosion inhibitor molecules in the thioketone metal surface corrosion inhibitor material provided by the present invention can react with the oxidant in the corrosive medium and / or the hydrogen ions formed by dissociation, thereby inhibiting the corrosion of the metal by hindering the oxidation-reduction process.

[0023] (3) The nitrogen atoms in the N heterocyclic structure contained in the thioketone metal surface corrosion inhibitor material provided by the present invention may participate in the electron transfer process on the metal surface, and change the electrode properties of the metal surface by affecting the charge distribution on the metal surface, thereby also slowing down the corrosion reaction.

[0024] In addition, additional advantages, objects, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The objects and other advantages of the present invention may be realized and obtained by the structures and method steps specifically pointed out in the written description and claims and the accompanying drawings.

[0025] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention.

[0027] Figure 1 The H NMR spectrum of the (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 3 of the present invention;

[0028] Figure 2The infrared spectrum of the (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 3 of the present invention;

[0029] Figure 3 The photoelectron spectrum of the (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 3 of the present invention;

[0030] Figure 4 This is the thermogravimetric analysis of the (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 3 of the present invention;

[0031] Figure 5 The molecular structure, frontier orbital and electrostatic potential diagram of (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 3 of the present invention;

[0032] Figure 6 This is a graph showing the corrosion rate of carbon steel in a saturated NTO solution to which (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is added in Example 1-4 of the present invention;

[0033] Figure 7 The H NMR spectrum of the 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 7 of the present invention;

[0034] Figure 8 is the infrared spectrum of the 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 7 of the present invention;

[0035] Fig. 9 The photoelectron spectrum of the 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 7 of the present invention;

[0036] Fig.10 This is the thermogravimetric analysis of the 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 7 of the present invention;

[0037] Fig.11The molecular structure, frontier orbital and electrostatic potential diagram of the 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 7 of the present invention;

[0038] Fig.12 This is a graph showing the corrosion rate of carbon steel in a saturated NTO solution to which 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is added in Example 5-8 of the present invention;

[0039] Fig.13 is the H NMR spectrum of the 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 11 of the present invention;

[0040] Fig.14 is the infrared spectrum of the 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 11 of the present invention;

[0041] Fig.15 The photoelectron spectrum of the 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 11 of the present invention;

[0042] Fig.16 This is the thermogravimetric analysis of the 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 11 of the present invention;

[0043] Fig.17 The molecular structure, frontier orbital and electrostatic potential diagram of the 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 11 of the present invention;

[0044] Fig.18 This is a graph showing the corrosion rate of carbon steel in a saturated NTO solution to which a 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is added in Examples 9-12 of the present invention;

[0045] Fig.19 This is the H NMR spectrum of the 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 15 of the present invention;

[0046] Fig. 20 is the infrared spectrum of the 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 15 of the present invention;

[0047] Fig.21The photoelectron spectrum of the 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 15 of the present invention;

[0048] Fig. 22 This is the thermogravimetric analysis of the 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 15 of the present invention;

[0049] Fig.23 The molecular structure, frontier orbital and electrostatic potential diagram of the 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor in Example 15 of the present invention;

[0050] Fig.24 This is a graph showing the corrosion rate of carbon steel in a saturated NTO solution to which 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is added in Examples 13-16 of the present invention.

[0051] Fig.25 It is a schematic flow chart of a method for verifying the effect of a thione-based metal surface corrosion inhibitor material according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should also be noted that, in order to avoid blurring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0053] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0054] The first aspect of the embodiment of the present invention provides a thioketone metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0055]

[0056] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is put into the solution for sufficient reaction, specifically including: 2-amino-5-mercapto-1,3,4-thiadiazole is 1-5mmol; the solvent is one of ultra-dry tetrahydrofuran, anhydrous ethanol or ethyl acetate, and the amount of the solvent is 10-30mL; the aldehyde-containing compound is 1-10mmol of 1,4-benzodioxane-6-carboxaldehyde; after a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

[0057] The second aspect of the embodiment of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0058]

[0059] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is put into the solution for sufficient reaction, specifically including: 2-amino-5-mercapto-1,3,4-thiadiazole is 18-28 mmol; the solvent is one of acetone, trifluoroacetic acid or dichloromethane, and the amount of the solvent is 30-90 mL; the aldehyde-containing compound is 1-30 mmol of 1,4-benzodioxane-6-carboxaldehyde; after a certain amount of aldehyde-containing compound is put into the solution, and the reaction process is monitored by thin layer chromatography, after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thione metal surface corrosion inhibitor material.

[0060] The third aspect of the embodiment of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0061]

[0062] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is put into the solution for sufficient reaction, specifically including: 8-15 mmol of 2-amino-5-mercapto-1,3,4-thiadiazole; the solvent is one of dimethylformamide, dimethyl sulfoxide and methanol, and the amount of the solvent is 10-50 mL; the aldehyde-containing compound is 1-15 mmol; and the 4-pyridinecarboxaldehyde is 1-15 mmol; after a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

[0063] A fourth aspect of the embodiments of the present invention provides a thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. The specific structure of the material is as follows:

[0064]

[0065] Optionally, a solution is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent, and then a certain amount of aldehyde-containing compound is put into the solution for sufficient reaction, specifically comprising: 150-1500 mg of 2-amino-5-mercapto-1,3,4-thiadiazole; the solvent is one of chloroform, 2-methyltetrahydrofuran or tetrachloromethane, and the amount of the solvent is 10-30 mL; the aldehyde-containing compound is 200-2000 mg of dibenzofuran-4-carboxaldehyde; after a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

[0066] Combined with Fig.25 In a fifth aspect, an embodiment of the present invention provides a method for verifying the effect of a thione-type metal surface corrosion inhibitor material, which is used to verify the corrosion inhibition effect of the thione-type metal surface corrosion inhibitor material, and includes the following specific steps: S1: adding the thione-type metal surface corrosion inhibitor material to a saturated NTO solution; S2: soaking carbon steel in the saturated NTO solution added with the thione-type metal surface corrosion inhibitor material in S1, and calculating the corrosion rate of the carbon steel; S3: setting a comparative example, and performing parameter comparison between the corrosion rate calculated in S2 and the comparative example to verify the corrosion inhibition effect of the thione-type metal surface corrosion inhibitor material.

[0067] Optionally, S3 specifically includes: a comparative example is set to directly immerse carbon steel in a saturated NTO solution without adding a thioketone metal surface corrosion inhibitor material, and test the corrosion rate.

[0068] The sixth aspect of the embodiment of the present invention provides an amino acid metal surface corrosion inhibitor material in the field of metal corrosion prevention and control technology.

[0069] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0070] Example 1

[0071] 1mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 15mL of ultra-dry tetrahydrofuran, and then 1mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature for 6min. After that, 0.01mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 1h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 10mL, and the system was placed at -5°C to precipitate solids. The obtained solid was filtered and vacuum dried at 60°C for 24h before collection to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0072] Example 2

[0073] 2mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 13mL of ethyl acetate, and then 2mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature for 3min. After that, 0.02mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 1.5h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 7mL, and the system was placed at -2°C to precipitate solids. The obtained solid was filtered and vacuum dried at 60°C for 24h before collection to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0074] Example 3

[0075] Combined with Figure 1-5In this embodiment, 3.1 mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 11 mL of anhydrous ethanol, and then 3.1 mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature for 5 min. After that, 0.03 mL of concentrated sulfuric acid was added to the above solution for catalysis, and heated to reflux after stirring at room temperature for 2 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 5 mL, and the system was placed at 0 ° C to precipitate solids. The obtained solid was filtered and vacuum dried at 60 ° C for 24 h and then collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0076] Example 4

[0077] 5mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 20mL of anhydrous ethanol, and then 5mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature for 10min. After that, 0.05mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 3h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 15mL, and the system was placed at 2°C to precipitate solids. The obtained solid was filtered and vacuum dried at 60°C for 24h before collection to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0078] Comparative Example

[0079] The corrosion rate of carbon steel was tested by immersing it in a saturated NTO solution without adding (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor.

[0080] Table 1 Corrosion inhibition performance of (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor on NTO

[0081]

[0082]

[0083] From the attached Figure 6It can be seen that the corrosion rate of NTO saturated solution on mild steel after adding (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is significantly reduced, and its corrosion rate is 4.64mm / y. This shows that the corrosion of NTO on mild steel is effectively inhibited by adding (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione. This is due to the addition of (5-[(1,3-benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione [(1,3-Benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione can form complexes with metal surfaces through heteroatoms such as nitrogen and sulfur and unsaturated functional groups, reducing the solubility of metal ions. This complexation can reduce the erosion of NTO on the metal surface, thereby slowing down the corrosion process. In addition, (5-[(1,3-Benzodioxazol-5-ylmethylene)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor can also partially absorb hydrogen ions generated by the dissociation of NTO in the solution, alleviating the corrosion damage of active hydrogen ions on the metal.

[0084] Example 5

[0085] 18mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 30mL of acetone, and then 18mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature to completely dissolve. After that, 1mL of concentrated sulfuric acid was added to the above solution for catalysis, and refluxed and stirred for 12h after heating at room temperature. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, and the system was placed at room temperature for 24h. The obtained solid was filtered and vacuum dried at 65°C for 24h and then collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0086] Example 6

[0087] 19mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 50mL of trifluoroacetic acid, and then 19mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature to completely dissolve. After that, 3mL of concentrated sulfuric acid was added to the above solution for catalysis, and refluxed and stirred for 12h after heating at room temperature. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, and the system was placed at room temperature for 30h. The obtained solid was filtered and vacuum dried at 80°C for 24h and then collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0088] Example 7

[0089] Combined with Figure 7-11 , 20mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 70mL of dichloromethane, and then 20mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature to completely dissolve. After that, 5mL of concentrated sulfuric acid was added to the above solution for catalysis, and refluxed and stirred for 12h after heating at room temperature. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, and the system was placed at room temperature for 36h. The obtained solid was filtered and vacuum dried at 70°C for 24h and then collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0090] Example 8

[0091] 28mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 90mL of dichloromethane, and then 28mmol of 1,4-benzodioxane-6-carboxaldehyde was added to the above solution and stirred at room temperature to completely dissolve. After that, 10mL of concentrated sulfuric acid was added to the above solution for catalysis, and refluxed and stirred for 12h after heating at room temperature. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, and the system was placed at room temperature for 48h. The obtained solid was filtered and vacuum dried at 85°C for 24h and then collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0092] Comparative Example 2

[0093] The corrosion rate of carbon steel was tested by immersing it in a saturated NTO solution without adding 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor.

[0094] Table 2 Corrosion inhibition performance of 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor on NTO

[0095] Group Corrosion rate (mm / y) Comparative Example 2 9.03 Example 5 4.68 Example 6 4.44 Example 7 4.32 Example 8 4.56

[0096] From the attached Fig.12 It can be seen that the corrosion rate of NTO saturated solution on mild steel after adding 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is significantly reduced, and its corrosion rate is 4.32mm / y. This shows that the corrosion of NTO on mild steel is effectively inhibited by adding 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione. This is due to the tight adsorption and film formation of 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione on the surface of carbon steel, which hinders the corrosion of NTO on carbon steel. In addition, the corrosion inhibitor molecules can react with oxygen or other oxidants in the corrosive medium to inhibit the redox reaction and inhibit the corrosion of the metal. 5-[(1,3-dihydronaphthalene[2,3-c][1,2,5]oxadiazole)amino]-1,3,4-thiadiazole-2(3H)-thione also inhibits the reaction of NTO on the metal surface, further hindering the damage of the metal surface.

[0097] Example 9

[0098] 8mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 20mL of dimethylformamide, and then 8mmol of 4-pyridinecarboxaldehyde was added to the above solution and stirred at room temperature for 10min. After that, 0.1mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 12h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, 10mL of the reaction mixture was evaporated at 40°C, and the system was placed under an ice-water mixture to precipitate the solid. The obtained solid was washed and filtered with ether, and then vacuum dried at 50°C and collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0099] Example 10

[0100] 9 mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 35 mL of dimethyl sulfoxide, and then 9 mmol of 4-pyridine carboxaldehyde was added to the above solution and stirred at room temperature for 12 min. After that, 0.3 mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 12 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, 10 mL of the reaction mixture was evaporated at 45 ° C, and the system was placed under an ice-water mixture to precipitate the solid. The obtained solid was washed and filtered with acetonitrile and then vacuum dried at 50 ° C and collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0101] Embodiment 11

[0102] Combined with Figure 13-17 , 13mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 46mL of dimethylformamide, and then 13mmol of 4-pyridinecarboxaldehyde was added to the above solution and stirred at room temperature for 15min. After that, 0.6mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 12h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, 10mL of the reaction mixture was evaporated at 50°C, and the system was placed under an ice-water mixture to precipitate the solid. The obtained solid was washed and filtered with anhydrous ethanol, and then vacuum dried at 50°C and collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0103] Example 12

[0104] 15mmol of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 50mL of methanol, and then 15mmol of 4-pyridinecarboxaldehyde was added to the above solution and stirred at room temperature for 20min. After that, 0.8mL of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated to reflux after stirring at room temperature for 12h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, 10mL of the reaction mixture was evaporated at 60°C, and the system was placed under an ice-water mixture to precipitate solids. The obtained solid was washed with ether and filtered, and then vacuum dried at 50°C and collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0105] Comparative Example 3

[0106] The corrosion rate of carbon steel was tested by directly immersing it in a saturated NTO solution without adding 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor.

[0107] Table 3 Corrosion inhibition performance of 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor on NTO

[0108] Group Corrosion rate (mm / y) Comparative Example 3 9.03 Example 9 5.68 Example 10 4.78 Embodiment 11 3.56 Example 12 4.02

[0109] From the attached Fig.18 It can be seen that the corrosion rate of low carbon steel in NTO saturated solution after adding 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is significantly reduced, and its corrosion rate is 3.56mm / y. It shows that the corrosion of low carbon steel by NTO is effectively inhibited by adding 5-(5-pyridyl)-1,3,4-thiadiazole-2(3H)-thione. The nitrogen atoms in the corrosion inhibitor induce electronic effects, which can change the interaction between the corrosion inhibitor and the metal surface. As a result, the corrosion inhibitor is more strongly adsorbed on the metal surface, forming a protective film that blocks the contact between the metal and the corrosive medium. In addition, the nitrogen atoms in the N heterocyclic structure may participate in the electron transfer process on the metal surface. This electron transfer may cause changes in the charge distribution on the metal surface, thereby changing the electrode properties of the metal surface and slowing down the corrosion reaction.

[0110] Example 13

[0111] 300 mg of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 13 mL of chloroform, and then 200 mg of dibenzofuran-4-carboxaldehyde was added to the above solution and stirred at room temperature for 20 min. After that, 10 mg of aluminum chloride was added to the above solution for catalysis, and heated under reflux and stirred at room temperature for 12 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 10 mL, and the system was placed at 0 ° C to precipitate solids. The obtained solid was filtered and washed with chloroform and then vacuum dried at 40 ° C for 48 h to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0112] Embodiment 14

[0113] 800 mg of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 15 mL of tetrachloromethane, and then 400 mg of dibenzofuran-4-carboxaldehyde was added to the above solution and stirred at room temperature for 25 min. After that, 20 mg of ferric chloride was added to the above solution for catalysis, and heated under reflux and stirred at room temperature for 12 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 10 mL, and the system was placed at 0 ° C to precipitate solids. The obtained solid was filtered and washed with dichloromethane and then vacuum dried at 40 ° C for 48 h to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0114] Embodiment 15

[0115] Combined with Figure 19-23 , 1000 mg of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 18 mL of 2-methyltetrahydrofuran, and then 680 mg of dibenzofuran-4-carboxaldehyde was added to the above solution and stirred at room temperature for 30 min. After that, 50 mg of concentrated sulfuric acid was added to the above solution for catalysis, and heated under reflux and stirred at room temperature for 12 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 10 mL, and the system was placed at 0 ° C to precipitate solids. The obtained solid was filtered and washed with chloroform and then vacuum dried at 40 ° C for 48 h to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0116] Example 16

[0117] 1500 mg of 2-amino-5-mercapto-1,3,4-thiadiazole was dissolved in 30 mL of 2-methyltetrahydrofuran, and then 900 mg of dibenzofuran-4-carboxaldehyde was added to the above solution and stirred at room temperature for 40 min. After that, 100 mg of concentrated sulfuric acid was added to the above solution for catalysis, and the mixture was heated under reflux and stirred at room temperature for 12 h. Subsequently, the reaction was terminated after monitoring by thin layer chromatography, the reaction mixture was reduced to 10 mL, and the system was placed at 0 ° C to precipitate solids. The obtained solid was filtered and washed with xylene, and then vacuum dried at 40 ° C for 48 h and collected to obtain a thioketone organic corrosion inhibitor. Finally, the collected thioketone organic corrosion inhibitor was added to a saturated NTO solution, and the mass loss of carbon steel immersed in this solution was taken to calculate the corrosion rate to verify the effect of this thioketone organic corrosion inhibitor.

[0118] Comparative Example 4

[0119] The corrosion rate of carbon steel was tested by directly immersing it in a saturated NTO solution without adding 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor.

[0120] Table 4 Corrosion inhibition performance of 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor on NTO

[0121] Group Corrosion rate (mm / y) Comparative Example 4 9.03 Example 13 4.71 Embodiment 14 3.48 Embodiment 15 2.96 Example 16 3.14

[0122] From the attached Fig.24 It can be seen that the corrosion rate of NTO saturated solution on mild steel after adding 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione corrosion inhibitor is significantly reduced, and its corrosion rate is 2.96mm / y. It shows that the corrosion of NTO on mild steel is effectively inhibited by adding 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione. This is due to the protective film formed by 5-[(3-methyldibenzofuran)amino]-1,3,4-thiadiazole-2(3H)-thione organic corrosion inhibitor on the metal surface, which blocks the direct contact between the metal and the corrosive medium. In addition, this organic corrosion inhibitor forms a more negatively charged layer after adsorption on the metal surface, reducing the electrode potential on the metal surface. This makes it more difficult for the metal to become the cathode of corrosion, thereby slowing down the corrosion reaction.

[0123] The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thione metal surface corrosion inhibitor material, which is obtained by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of aldehyde-containing compound in the solution for sufficient reaction, characterized in that: The specific structure of the material is as follows:

2. The thionone metal surface corrosion inhibitor material according to claim 1, characterized in that: The method of dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction specifically includes: The 2-amino-5-mercapto-1,3,4-thiadiazole is 1-5 mmol; the solvent is one of super dry tetrahydrofuran, anhydrous ethanol or ethyl acetate, and the amount of the solvent is 10-30 mL; The aldehyde-containing compound is 1-10 mmol of 1,4-benzodioxane-6-carboxaldehyde; After a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

3. A thioketone metal surface corrosion inhibitor material, characterized in that: The method is prepared by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of an aldehyde-containing compound in the solution for sufficient reaction. The material is characterized in that the specific structure of the material is as follows:

4. The thioketone metal surface corrosion inhibitor material according to claim 3, characterized in that: The method comprises dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. Specifically, the method comprises: The 2-amino-5-mercapto-1,3,4-thiadiazole is 18-28 mmol; the solvent is one of acetone, trifluoroacetic acid or dichloromethane, and the amount of the solvent is 30-90 mL; The aldehyde-containing compound is 1-30 mmol of 1,4-benzodioxane-6-carboxaldehyde; After a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

5. A thionone metal surface corrosion inhibitor material, characterized in that: The method is prepared by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of an aldehyde-containing compound in the solution for sufficient reaction. The material is characterized in that the specific structure of the material is as follows:

6. The thionone metal surface corrosion inhibitor material according to claim 5, characterized in that: The method comprises dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. Specifically, the method comprises: The 2-amino-5-mercapto-1,3,4-thiadiazole is 8-15 mmol; the solvent is one of dimethylformamide, dimethyl sulfoxide and methanol, and the amount of the solvent is 10-50 mL; The aldehyde-containing compound is 1-15 mmol of 4-pyridinecarboxaldehyde; After a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

7. A thionone metal surface corrosion inhibitor material, characterized in that: The method is prepared by dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then placing a certain amount of an aldehyde-containing compound in the solution for sufficient reaction. The material is characterized in that the specific structure of the material is as follows:

8. The thionone metal surface corrosion inhibitor material according to claim 7, characterized in that: The method comprises dissolving a certain amount of 2-amino-5-mercapto-1,3,4-thiadiazole in a certain amount of solvent to obtain a solution, and then adding a certain amount of aldehyde-containing compound into the solution for sufficient reaction. Specifically, the method comprises: The 2-amino-5-mercapto-1,3,4-thiadiazole is 150-1500 mg; the solvent is one of chloroform, 2-methyltetrahydrofuran or tetrachloromethane, and the amount of the solvent is 10-30 mL; The aldehyde-containing compound is 200-2000 mg of dibenzofuran-4-carboxaldehyde; After a certain amount of aldehyde-containing compound is put into the solution, the reaction process is monitored by thin layer chromatography, and after the reaction is completed, the mixed solution is placed at a certain temperature to precipitate a solid product of the thioketone metal surface corrosion inhibitor material.

9. A method for verifying the effect of a thione-based metal surface corrosion inhibitor material, used to verify the corrosion inhibition effect of the thione-based metal surface corrosion inhibitor material according to any one of claims 1 to 8, characterized in that: The specific steps include: S1: adding the thioketone metal surface corrosion inhibitor material into a saturated NTO solution; S2: taking carbon steel and immersing it in the NTO saturated solution to which the thioketone metal surface corrosion inhibitor material is added as described in S1, and calculating the corrosion rate of the carbon steel; S3: setting a comparative example, and performing parameter comparison between the corrosion rate calculated in S2 and the comparative example to verify the corrosion inhibition effect of the thioketone metal surface corrosion inhibitor material.

10. The method for verifying the effect of the thionone metal surface corrosion inhibitor material according to claim 9, characterized in that: The S3 specifically includes: The comparative example is set to directly immerse carbon steel in a saturated NTO solution without adding the thioketone metal surface corrosion inhibitor material, and test the corrosion rate.

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