Corrosion inhibitor as well as preparation method and application thereof

Abstract

The invention discloses a corrosion inhibitor as well as a preparation method and application thereof. The preparation method of the corrosion inhibitor comprises the following steps: extracting morning glory powder by using an organic solvent, carrying out solid-liquid separation after the extraction is finished, and cooling the obtained liquid to be not higher than 0 DEG C to prepare an intermediate; mixing the intermediate with an aqueous solution containing an oxidizing agent for reaction, removing liquid in a reaction product, and carbonizing to prepare the corrosion inhibitor. The provided preparation method of the morning glory extract corrosion inhibitor has the advantages of high safety, no need of dangerous chemicals, easily available raw materials, low cost and high benefit. The prepared morning glory extract corrosion inhibitor is environment-friendly, has a stable and lasting anti-corrosion protection effect in various environments, and is high in corrosion inhibition efficiency.

Description

Technical Field

[0001] The invention belongs to the field of corrosion protection, and specifically relates to a corrosion inhibitor, a preparation method and application thereof. Background Art

[0002] In power grid structures, steel materials are often exposed to humid and changing environments and are susceptible to corrosion. Although traditional organic corrosion inhibitors can provide a certain degree of protection, their preparation process is often complicated and harmful to the environment during production or use. In practical applications, traditional corrosion inhibitors have poor durability and corrosion inhibition efficiency. Summary of the invention

[0003] Aiming at the problem that the current corrosion inhibitor has poor durability and corrosion inhibition efficiency, a corrosion inhibitor, a preparation method and application thereof are provided.

[0004] In a first aspect, in some embodiments, a method for preparing a corrosion inhibitor is provided, comprising the following steps:

[0005] Extracting morning glory pollen with an organic solvent, separating the solid and the liquid after the extraction, and cooling the obtained liquid to no higher than 0° C. to prepare an intermediate;

[0006] The intermediate is mixed with an aqueous solution containing an oxidant to react, and the liquid in the reaction product is removed and carbonized to prepare the corrosion inhibitor.

[0007] In some embodiments, the method for preparing the corrosion inhibitor satisfies one or more of the following characteristics:

[0008] (1) In the step of extracting morning glory pollen with an organic solvent, the ratio of morning glory pollen to organic solvent, calculated in g / mL, is 1:(20-100) based on the amount of feed;

[0009] (2) In the step of mixing the intermediate with an aqueous solution containing an oxidant for reaction, the amount ratio of the intermediate to the aqueous solution containing the oxidant, calculated in g / mL, is 1:(10-30) based on the amount of feed.

[0010] In some embodiments, the method for preparing the corrosion inhibitor satisfies one or more of the following characteristics:

[0011] (1) In the step of extracting morning glory pollen using an organic solvent, the extraction time is 1 hour to 5 hours;

[0012] (2) In the step of extracting morning glory pollen with an organic solvent, the extraction temperature is 300K~500K;

[0013] (3) In the step of extracting morning glory pollen using an organic solvent, the organic solvent is one or more of a 20% (v / v) ethanol aqueous solution and a 20% (v / v) acetone aqueous solution.

[0014] In some embodiments, the method for preparing the corrosion inhibitor satisfies one or more of the following characteristics:

[0015] (1) Cooling the obtained liquid to a temperature not higher than 0°C and keeping it at -5°C to 0°C for 30h to 50h;

[0016] (2) mixing the intermediate with an aqueous solution containing an oxidant to carry out a reaction step, wherein the reaction time is 2 h to 5 h;

[0017] (3) In the step of removing the liquid in the reaction product, the liquid in the reaction product is removed by evaporation at 50°C to 200°C for 4h to 20h.

[0018] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of mixing the intermediate with an aqueous solution containing an oxidant to carry out a reaction, the aqueous solution containing the oxidant is an aqueous solution containing H2O2.

[0019] In some embodiments, in the aqueous solution containing H2O2, the volume ratio of H2O2 to water is 1:(15~20).

[0020] In some embodiments, in the method for preparing the corrosion inhibitor, in the carbonization step, the carbonization temperature is 400° C. to 600° C., and the carbonization time is 3 h to 8 h.

[0021] In a second aspect, in some embodiments, a corrosion inhibitor is provided, which is prepared by the preparation method.

[0022] In some embodiments, the particle size of the corrosion inhibitor is 300nm~600nm.

[0023] In a third aspect, in some embodiments, there is provided a use of the corrosion inhibitor in preparing a corrosion inhibitor for a metal-containing material.

[0024] In some embodiments, the metal is one or more of aluminum, iron, and copper.

[0025] The preparation method of the morning glory extract corrosion inhibitor provided in the present application is highly safe, does not require the use of hazardous chemicals, has readily available raw materials, is low in cost, and has high benefits. The prepared morning glory extract corrosion inhibitor is environmentally friendly, does not contain toxic ingredients, meets environmental protection standards, avoids environmental pollution by harmful chemicals, and has a stable and lasting anti-corrosion protection effect in various environments. The prepared morning glory extract corrosion inhibitor is widely used in a variety of metal-containing materials. The morning glory extract corrosion inhibitor provided can quickly react with the surface of the metal-containing material to form a stable protective layer, effectively block the erosion of the corrosive medium in a short time, has a high corrosion inhibition efficiency, has a lasting anti-corrosion protection effect, and can significantly extend the service life of the metal-containing material. No hazardous chemicals are required during the application process, and safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the implementation methods and examples of the present application and to more completely understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for use in the description of the implementation methods or examples. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0027] Figure 1 This is a transmission electron microscopy image of the morning glory extract corrosion inhibitor prepared in Example 1;

[0028] Figure 2 The results of the surface morphology analysis of the sample using the morning glory extract corrosion inhibitor prepared in Example 1 are shown, wherein (a) is a surface morphology of the sample after immersion in HCl solution for 24 hours without adding the corrosion inhibitor prepared in Example 1, and (b) is a surface morphology of the sample after immersion in HCl solution for 24 hours with the corrosion inhibitor prepared in Example 1;

[0029] Figure 3 This is a graph showing the electrochemical impedance spectroscopy test results of the morning glory extract corrosion inhibitor prepared in Example 1. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0033] In the present application, "plurality", "multiple", "multiple times", "multiples", etc., unless otherwise specified, refer to a number greater than 2 or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0034] The terms "combination thereof", "any combination thereof", "any combination thereof" and the like used in this application include all suitable combinations of any two or more of the listed items.

[0035] As used in this application, "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0036] In this application, the "suitable" mentioned in "suitable combination", "suitable method", "any suitable method", etc. is based on the ability to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0037] In the present application, "preferred", "better", "more preferred" and "suitable" are only used to describe implementation methods or examples with better effects. It should be understood that they do not constitute limitations on the scope of protection of the present application.

[0038] In the present application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present application.

[0039] In this application, "optionally", "optional", and "optional" mean optional or dispensable, that is, any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0040] In the present invention, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0041] In this application, the terms "one embodiment", "some embodiments", "some implementation methods", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] In this application, numerical values ​​represent approximate measured values ​​or range limits to cover slight deviations from given values ​​and embodiments having approximately the mentioned values ​​and embodiments having exactly the mentioned values. Except in the working examples provided at the end of the detailed description, all numerical values ​​of (such as amount or condition) parameters in this specification (including the appended claims) should be understood to be modified by the term "approximately" in all cases, regardless of whether "approximately" actually appears before the numerical value. "Approximately" means that the numerical value allows a certain slight imprecision (close to the exact value of the value to a certain extent; approximately or reasonably approximate the value; almost). If the imprecision provided by "approximately" is not understood separately in this art in this common sense, then "approximately" used herein refers to at least the deviation that can be caused by the common methods of measuring and using such parameters. For example, "approximately" may include less than or equal to 5%, optionally less than or equal to 4%, optionally less than or equal to 3%, optionally less than or equal to 2%, optionally less than or equal to 1%, optionally less than or equal to 0.5%, and optionally less than or equal to 0.1% deviation in some aspects.

[0043] Additionally, disclosure of ranges includes disclosure of all values ​​within the entire range and further subdivided ranges, including endpoints and subranges given within those ranges.

[0044] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0045] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0046] In the present application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical range, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0047] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0048] "Room temperature" in this application generally refers to 5°C ~ 30°C, for example, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, preferably refers to 25±5°C.

[0049] In the present application, % (w / w) and wt% both represent weight percentage, % (v / v) refers to volume percentage, and % (w / v) refers to mass volume percentage.

[0050] The "room temperature" in this application generally refers to 5°C to 30°C, preferably 25±5°C.

[0051] In some embodiments, a method for preparing a corrosion inhibitor is provided, comprising the following steps:

[0052] Extracting morning glory pollen with an organic solvent, separating the solid and the liquid after the extraction, and cooling the obtained liquid to no higher than 0° C. to prepare an intermediate;

[0053] The intermediate is mixed with an aqueous solution containing an oxidant to react, and the liquid in the reaction product is removed and carbonized to prepare the corrosion inhibitor.

[0054] In some embodiments, in the preparation method of the corrosion inhibitor, in the step of extracting morning glory pollen with an organic solvent, the dosage ratio of morning glory pollen to organic solvent, calculated by the feeding amount, is 1:(20~100) in g / mL. For example, the dosage ratio of morning glory pollen to organic solvent, calculated by g / mL, can be 1:20, 1:30, 1:40, 1:50, 1:60, 1:70, 1:80, 1:90, 1:100, etc., and can also be a range consisting of any two of the aforementioned ratios.

[0055] In some embodiments, in the preparation of the corrosion inhibitor, in the step of mixing the intermediate with an aqueous solution containing an oxidant for reaction, the dosage ratio of the intermediate to the aqueous solution containing the oxidant, calculated in g / mL, is 1:(10~30). For example, the dosage ratio of the intermediate to the aqueous solution containing the oxidant, calculated in g / mL, can be 1:10, 1:15, 1:20, 1:25, 1:30, etc., and can also be a range consisting of any two of the aforementioned ratios.

[0056] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of extracting morning glory pollen using an organic solvent, the extraction time is 1h~5h. For example, the extraction time can be 1h, 2h, 3h, 4h, 5h, etc., and can also be a range consisting of any two of the aforementioned values.

[0057] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of extracting morning glory pollen using an organic solvent, the temperature for performing the extraction is 300K~500K. For example, the temperature for performing the extraction can be 300K, 350K, 400K, 450K, 500K, etc., and can also be a range consisting of any two of the aforementioned values.

[0058] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of extracting morning glory pollen with an organic solvent, the organic solvent is one or more of a 20% (v / v) ethanol aqueous solution and a 20% (v / v) acetone aqueous solution.

[0059] In some embodiments, in the method for preparing the corrosion inhibitor, the obtained liquid is cooled to a temperature not higher than 0°C, and is kept warm for 30h to 50h at -5°C to 0°C. It is understandable that in the step of cooling the obtained liquid to a temperature not higher than 0°C, the obtained liquid can be cooled to, for example, 0°C, -1°C, -2°C, -3°C, -4°C, -5°C, etc., and the obtained liquid can also be cooled to a range consisting of any two of the aforementioned values. It is understandable that the aforementioned insulation for 30h to 50h, for example, can be insulation for 30h, 35h, 40h, 45h, 50h, etc., and can also be a range consisting of any two of the aforementioned values.

[0060] In some embodiments, in the preparation method of the corrosion inhibitor, in the step of mixing the intermediate with an aqueous solution containing an oxidant for reaction, the reaction time is 2h~5h. For example, the intermediate is mixed with an aqueous solution containing an oxidant for reaction, and the reaction time can be 2h, 3h, 4h, 5h, etc. The reaction time can also be a range composed of any two of the aforementioned values.

[0061] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of removing the liquid in the reaction product, the liquid in the reaction product is removed by evaporation at 50°C to 200°C for 4h to 20h. For example, the evaporation can be performed at 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, etc., and can also be performed under the conditions of a range composed of any two of the aforementioned numerical values. For example, the evaporation time can be 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, etc., and the evaporation time can also be a range composed of any two of the aforementioned numerical values.

[0062] In some embodiments, in the method for preparing the corrosion inhibitor, in the step of mixing the intermediate with an aqueous solution containing an oxidant to carry out a reaction, the aqueous solution containing the oxidant is an aqueous solution containing H2O2.

[0063] In some embodiments, in the method for preparing the corrosion inhibitor, in the aqueous solution containing H2O2, the volume ratio of H2O2 to water is 1:(15~20), for example, the volume ratio of H2O2 to water can be 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, and the volume ratio of H2O2 to water can also be a range consisting of any two of the aforementioned ratios.

[0064] In some embodiments, in the preparation method of the corrosion inhibitor, in the carbonization step, the carbonization temperature is 400°C~600°C, and can also be a range consisting of any two of the aforementioned numerical values, and the carbonization time is 3h~8h, and can also be a range consisting of any two of the aforementioned numerical values.

[0065] In some embodiments, a corrosion inhibitor is provided, which is prepared by the preparation method.

[0066] It can be understood that the morning glory extract corrosion inhibitor provided is a morning glory extract-based carbon dot corrosion inhibitor.

[0067] In some embodiments, the particle size of the corrosion inhibitor is 300nm~600nm, for example, the particle size of the corrosion inhibitor is 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm. The particle size of the corrosion inhibitor can also be a range consisting of any two of the aforementioned values.

[0068] In some embodiments, there is provided a use of the corrosion inhibitor in preparing a corrosion inhibitor for a metal-containing material.

[0069] In some embodiments, the metal is one or more of aluminum, iron, and copper.

[0070] The present invention is further described in detail below in conjunction with specific implementation examples so that those skilled in the art can understand.

[0071] 1. Preparation of corrosion inhibitor

[0072] Example 1

[0073] Morning glory is collected from the natural environment. The extraction process of morning glory extract is as follows. First, the fresh morning glory is washed with deionized water, and then dried at 50°C for 72 hours, and then the dried material is washed and dried again. Morning glory pollen is obtained by grinding with a grinder. After that, 2g of morning glory pollen is soaked in 100mL of 20% (v / v) ethanol aqueous solution and soaked in a planar heater at 343K for 2 hours. Next, the morning glory pollen residue is removed by vacuum filtration to obtain a liquid, and then the liquid phase is stored at -4°C for 36 hours to obtain an intermediate.

[0074] 2 g of the obtained intermediate was mixed with 25 mL of distilled water containing H2O2, wherein the volume ratio of H2O2 to water was 1:19, and the reaction was carried out for 3 h, and then the temperature of the heater was slowly increased from 50°C to 200°C for 6 h to evaporate and remove the liquid, and after the liquid was completely evaporated to form a paste, it was transferred to a furnace and placed at a temperature of 420°C for 5 hours. They were taken out of the oven, cooled, and ground in a mortar to obtain fine powder to prepare a morning glory extract corrosion inhibitor.

[0075] 2. Performance Test

[0076] 1. Material Preparation

[0077] Steel material samples: steel materials were selected and cut into sizes of 10 mm × 10 mm × 1 mm. They were polished with 240 mesh, 400 mesh, 600 mesh, 1000 mesh, 1500 mesh, and 2000 mesh sandpaper in sequence to make the surface flat and remove the oxide film on the surface. They were polished with 2.5 μm polishing paste to ensure that the surface was as smooth as a mirror. They were then washed with deionized water and dried with nitrogen.

[0078] Acid pickling corrosion inhibitor solution: Take the morning glory extract corrosion inhibitor prepared in Example 1, add 0.5 M HCl solution, and prepare an acid pickling corrosion inhibitor solution containing the morning glory extract corrosion inhibitor with a concentration of 1 mM / L.

[0079] Control solution: Add 92 ml of analytical grade concentrated hydrochloric acid to 500 ml of deionized water and shake well to obtain a 0.5 M HCl solution.

[0080] 2. Sample surface morphology analysis

[0081] The steel material samples prepared above were immersed in the pickling corrosion inhibitor solution and the control solution prepared above for 36 hours, then taken out and vacuum dried for storage. The two samples were tested by scanning electron microscope. The electron microscope data were comprehensively analyzed to verify the effect of the new compound corrosion inhibitor on improving the corrosion resistance of steel.

[0082] 3. Electrochemical impedance spectroscopy (EIS)

[0083] Electrochemical impedance spectroscopy was performed using a three-electrode system, with the steel material used as the working electrode, the saturated calomel electrode (SCE) as the reference electrode, and the platinum electrode as the auxiliary electrode. The working electrode was immersed in the above-prepared acid corrosion inhibitor solution and the control solution to ensure that the electrode was completely immersed.

[0084] The electrodes were cleaned by constant potential experiment. After the constant potential experiment was completed, the samples in the two solutions were immediately subjected to electrochemical impedance test. The impedance value was measured using an impedance spectrum with a frequency range of 0.01 to 10000 Hz. The EIS data was analyzed and fitted to determine the impedance value of the passivation film and the corresponding electrochemical parameters.

[0085] 4. Transmission electron microscopy

[0086] The morning glory extract corrosion inhibitor prepared in Example 1 was tested by transmission electron microscopy. The transmission electron microscope used was Tecnai G2 Spirit T12, manufactured by Thermo. The microscope was operated at an accelerating voltage of 200 kV.

[0087] 3. Test results analysis

[0088] 1. Transmission electron microscopy

[0089] The transmission electron microscopy results are as follows Figure 1 As shown by Figure 1 It can be seen that the obtained morning glory extract corrosion inhibitor is irregular particles with a particle size of about 300 nm. It can be seen that the morning glory extract-based carbon dot corrosion inhibitor was successfully synthesized.

[0090] 2. Sample surface morphology analysis

[0091] The results are as follows Figure 2 As shown, Figure 2 (a) shows the surface morphology of the sample after immersion in HCl solution for 24 hours without adding the corrosion inhibitor prepared in Example 1, and (b) shows the surface morphology of the sample after immersion in HCl solution for 24 hours with the corrosion inhibitor prepared in Example 1. The results of scanning electron microscopy show that after adding the corrosion inhibitor prepared in Example 1, the steel material sample is smooth and has no obvious corrosion products.

[0092] 3. Electrochemical impedance spectroscopy (EIS)

[0093] Test results such as Figure 3 And as shown in Table 1.

[0094] Table 1. Corrosion inhibition effect of morning glory extract corrosion inhibitor of Example 1 at different immersion times

[0095]

[0096] Table 1 shows the impedance of steel materials for power grids at different times after adding new corrosion inhibitors. It can be seen from the figure that within 48 hours, the impedance still remains above 95%. Figure 3 What is presented is the Nyquist plot of the surface impedance of steel for power grid with / without the addition of the new corrosion inhibitor after 48 hours. The results show that the impedance of the steel material for power grid increased significantly after adding the morning glory extract corrosion inhibitor, indicating that its corrosion resistance was enhanced. This shows that the corrosion inhibitor has taken effect and can more effectively resist the erosion of corrosive media.

[0097] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description and drawings may be used to interpret the content of the claims.

Claims

1. A method for preparing a corrosion inhibitor, characterized in that: The steps include: Extracting morning glory pollen with an organic solvent, separating the solid and the liquid after the extraction, and cooling the obtained liquid to no higher than 0° C. to prepare an intermediate; The intermediate is mixed with an aqueous solution containing an oxidant to react, and the liquid in the reaction product is removed and carbonized to prepare the corrosion inhibitor.

2. The preparation method according to claim 1, characterized in that: Meet one or more of the following characteristics: (1) In the step of extracting morning glory pollen with an organic solvent, the ratio of morning glory pollen to organic solvent, calculated in g / mL, is 1:(20-100) based on the amount of feed; (2) In the step of mixing the intermediate with an aqueous solution containing an oxidant for reaction, the amount ratio of the intermediate to the aqueous solution containing the oxidant, calculated in g / mL, is 1:(10-30) based on the amount of feed.

3. The preparation method according to claim 1 or 2, characterized in that: Meet one or more of the following characteristics: (1) In the step of extracting morning glory pollen using an organic solvent, the extraction time is 1 hour to 5 hours; (2) In the step of extracting morning glory pollen with an organic solvent, the extraction temperature is 300K~500K; (3) In the step of extracting morning glory pollen using an organic solvent, the organic solvent is one or more of a 20% (v / v) ethanol aqueous solution and a 20% (v / v) acetone aqueous solution.

4. The preparation method according to any one of claims 1 to 3, characterized in that Meet one or more of the following characteristics: (1) Cooling the obtained liquid to a temperature not higher than 0°C and keeping it at -5°C to 0°C for 30h to 50h; (2) mixing the intermediate with an aqueous solution containing an oxidant to carry out a reaction step, wherein the reaction time is 2 h to 5 h; (3) In the step of removing the liquid in the reaction product, the liquid in the reaction product is removed by evaporation at 50°C to 200°C for 4h to 20h.

5. The preparation method according to any one of claims 1 to 4, characterized in that In the step of mixing the intermediate with an aqueous solution containing an oxidant for reaction, the aqueous solution containing an oxidant is an aqueous solution containing H2O2, Optionally, in the aqueous solution containing H2O2, the volume ratio of H2O2 to water is 1:(15-20).

6. The preparation method according to any one of claims 1 to 5, characterized in that In the carbonization step, the carbonization temperature is 400° C. to 600° C., and the carbonization time is 3 h to 8 h.

7. A corrosion inhibitor, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 6.

8. The corrosion inhibitor according to claim 7, characterized in that The particle size of the corrosion inhibitor is 300nm~600nm.

9. Use of the corrosion inhibitor according to claim 7 or 8 in preparing a corrosion inhibitor for metal-containing materials.

10. The use according to claim 9, characterized in that: The metal is one or more of aluminum, iron and copper.

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