A ZnO / SiO 2 Corrosion inhibitor-loaded material and its preparation method

Abstract

The present invention provides a ZnO / SiO 2 corrosion inhibitor-loaded material and a preparation method thereof. The preparation method of the material includes: S1: adding cetyltrimethoxysilane and N,N-diethyl-3-aminopropyltrimethoxysilane into absolute ethanol, stirring and mixing at room temperature for 20 to 40 minutes to carry out a silane modification reaction to obtain solution A; S2: adding ZnO and SiO 2 into absolute ethanol, and carrying out ultrasonic stirring to obtain solution B; S3: mixing solution A and solution B, and adding deionized water to carry out a hydrolysis and polycondensation reaction; S4: preparing a mixed solution of a corrosion inhibitor, deionized water and absolute ethanol in proportion, and then immersing the reaction product obtained in step S3 into the mixed solution, and carrying out stirring reaction under a water bath condition. The ZnO / SiO 2 corrosion inhibitor-loaded material of the present invention has a good corrosion protection effect on metals, and has a simple preparation process, is easy to operate, has low cost and is environmentally friendly.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal anti-corrosion. Specifically, the present invention relates to a ZnO / SiO 2 corrosion inhibitor-loaded material and a preparation method thereof. Background Art

[0002] The corrosion of metal materials is a key concern in countries around the world. Reducing metal corrosion plays an important role in social development and environmental protection. Strong acid cleaning of surface rust and dirt is an important cleaning method for metal surface pretreatment, and cleaning and descaling of pipelines and boiler systems. However, since strong acids have a corrosive effect on metal equipment, the phenomenon of "over-corrosion" often occurs during pickling, that is, during pickling, not only the dirt and rust on the metal surface are removed, but also the metal substrate will be corroded and damaged to a certain extent; in addition, during the pickling treatment of metal materials, a large amount of acid solution will also be generated during the process, causing serious damage to the environment.

[0003] A corrosion inhibitor is a substance or a mixture of several chemical substances that can effectively prevent or reduce the metal corrosion rate when present in a medium in an appropriate form and concentration. Only a small amount or a small amount of corrosion inhibitor needs to be added to significantly reduce the corrosion rate of the metal material in this medium until it is zero. At the same time, the original physical and mechanical properties of the metal material can be maintained unchanged. Reasonable use of corrosion inhibitors is an effective method to prevent the corrosion of metals and their alloys in environmental media. Therefore, adding a corrosion inhibitor during pickling is an effective way to inhibit the corrosion of metals in acidic media, reduce the amount of acid used, improve the acid use efficiency, and extend the service life of equipment. There are many types of corrosion inhibitors, and there are significant differences in the corrosion inhibition performance of different corrosion inhibitors for different metals. Therefore, corrosion inhibitors are very important in the preparation of industrial cleaning agents. However, existing corrosion inhibitors still have disadvantages such as poor anti-corrosion effect and poor environmental friendliness. Therefore, it is urgent to develop new high-efficiency, environmentally friendly, and easily available corrosion inhibitors. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, an embodiment of the present invention proposes a ZnO / SiO 2 corrosion inhibitor-loaded material and a preparation method thereof.

[0005] An embodiment of the present invention on the one hand proposes a preparation method of a ZnO / SiO 2 corrosion inhibitor-loaded material, including the following steps:

[0006] S1: Add cetyltrimethoxysilane and N,N-diethyl-3-aminopropyltrimethoxysilane to absolute ethanol, stir and mix at room temperature for 20-40 min to carry out a silane modification reaction to obtain solution A;

[0007] S2: Add ZnO and SiO 2 to absolute ethanol, and stir ultrasonically to obtain solution B;

[0008] S3: Mix solution A and solution B, add deionized water, and carry out hydrolysis and polycondensation reaction;

[0009] S4: Prepare a mixed solution of inhibitor, deionized water and absolute ethanol in proportion, then immerse the reaction product obtained in step S3 into the mixed solution, stir and react under water bath conditions, and the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained after the reaction ends.

[0010] In the embodiment of the present invention, the preparation method of the ZnO / SiO 2 corrosion inhibitor-loaded material utilizes the rough structures of ZnO and SiO 2 , and hydrophobic modification is carried out on ZnO and SiO 2 by using hexadecyltrimethoxysilane and N,N-diethyl-3-aminopropyltrimethoxysilane through hydrolysis and polycondensation reaction. Thus, the introduction of ZnO / SiO 2 micro-nano particles not only provides reaction sites for hydrophobic modification, but also can improve the surface roughness of the material, enabling it to load more corrosion inhibitors to better protect the metal matrix and avoid corrosion damage of the metal matrix; moreover, the preparation process is simple, easy to operate, green and pollution-free during the preparation process, and has a low cost, with high production value and broad market prospects.

[0011] In some embodiments of the present invention, in step S1, the mass ratio of the hexadecyltrimethoxysilane to the N,N-diethyl-3-aminopropyltrimethoxysilane is 1:(1-3).

[0012] In some embodiments of the present invention, in step S2, the mass ratio of the ZnO to the SiO 2 is 1:(0.5-1.5).

[0013] In some embodiments of the present invention, in step S2, the temperature of the ultrasonic stirring is 25-35°C; the time of the ultrasonic stirring is 20-40 min.

[0014] In some embodiments of the present invention, in step S3, the reaction temperature of the hydrolysis and polycondensation reaction is 40-60°C, and the reaction time is 1-3 h.

[0015] In some embodiments of the present invention, in step S4, the mass-volume ratio of the corrosion inhibitor to the deionized water and the absolute ethanol is (0.5-1.5) g:(25-35) mL:(5-15) mL, preferably 1 g:30 mL:10 mL.

[0016] In some embodiments of the present invention, in step S4, the corrosion inhibitor is a conventional corrosion inhibitor in the art, including but not limited to benzotriazole, cyclohexylamine carbonate, diammonium hydrogen phosphate, etc.

[0017] In some embodiments of the present invention, in step S4, the reaction temperature of the stirring reaction is 20 - 40 °C, and the reaction time is 10 - 14 h.

[0018] Another aspect of the embodiments of the present invention also provides a ZnO / SiO 2 corrosion inhibitor - loaded material, which is prepared by the above - mentioned preparation method. This material uses hexadecyltrimethoxysilane and N,N - diethyl - 3 - aminopropyltrimethoxysilane to perform hydrophobic modification on ZnO and SiO 2 to make it hydrophobic; and due to the rough structure of ZnO and SiO 2 , it can load more corrosion inhibitors, thus showing good corrosion protection effect; and this material is green and pollution - free, friendly to the environment, meeting the development trend of green corrosion inhibitors.

[0019] Another aspect of the embodiments of the present invention also provides the application of the above - mentioned ZnO / SiO 2 corrosion inhibitor - loaded material in the field of metal anti - corrosion protection. When the surface of a metal material is pickled, only a small amount of corrosion inhibitor needs to be added to effectively inhibit the harmful corrosion of the metal material, which has the advantages of high corrosion inhibition efficiency and low dosage, and has important significance in practical industrial applications.

[0020] The advantages and beneficial effects of the present invention are as follows:

[0021] (1) In the embodiments of the present invention, ZnO / SiO 2 is used as the loading matrix of the corrosion inhibitor. Among them, SiO 2 as nanoparticles can be uniformly embedded around ZnO micron particles to form a hollow structure, which can act as a protective layer and has a protective effect, thereby reducing the corrosion of acidic media and enabling it to effectively inhibit the surface corrosion of metal materials even at high temperatures or high acidities; and due to the rough structure of ZnO / SiO 2 , it can load more corrosion inhibitors, and the corrosion inhibition effect is better.

[0022] (2) In the embodiments of the present invention, hexadecyltrimethoxysilane and N,N - diethyl - 3 - aminopropyltrimethoxysilane are also used to perform hydrophobic modification on ZnO / SiO 2 , so that the prepared ZnO / SiO 2 corrosion inhibitor - loaded material has both hydrophobic properties, further avoiding the corrosion of metal materials, showing good corrosion protection effect, and having high industrial application value.

[0023] (3) In the embodiment of the present invention, ZnO / SiO 2 The preparation process of the corrosion inhibitor-loaded material is simple, easy to operate, low in cost, and the preparation process is green and pollution-free, having high production value and broad market prospects. Specific Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs.

[0026] On the one hand, the embodiment of the present invention proposes a method for preparing a ZnO / SiO 2 corrosion inhibitor-loaded material, comprising the following steps:

[0027] S1: Add hexadecyltrimethoxysilane (HDTMS) and N,N-diethyl-3-aminopropyltrimethoxysilane (DMPTMS) into absolute ethanol, stir and mix at room temperature for 20 - 40 min to carry out a silane modification reaction to obtain solution A;

[0028] S2: Add ZnO and SiO 2 into absolute ethanol, stir ultrasonically to obtain solution B;

[0029] S3: Mix solution A and solution B, and add deionized water to carry out a hydrolysis and polycondensation reaction;

[0030] S4: Prepare a mixed solution of a corrosion inhibitor, deionized water, and absolute ethanol in proportion, then immerse the reaction product obtained in step S3 into the mixed solution, stir and react under a water bath condition, and after the reaction ends, the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained.

[0031] In the ZnO / SiO 2 corrosion inhibitor-loaded material provided by the embodiment of the present invention, since both SiO 2 and ZnO are high-temperature resistant materials, having high chemical stability and thermal stability, and SiO 2 has a nano-hollow mesoporous structure, by compounding ZnO with SiO 2 it can make SiO 2The nanoparticles are uniformly embedded around the ZnO micro-particles, thus forming hollow structures of different sizes, which can act as a protective layer and have a protective effect. In this way, not only can part of the air be effectively intercepted, and thus the penetration of droplets can be effectively prevented, but also the corrosion of acidic media can be reduced. Therefore, the surface corrosion of metal materials can still be effectively inhibited under high temperature or high acidity conditions; and ZnO / SiO 2 has a rough structure and can load more corrosion inhibitors, making the corrosion inhibition effect of the composite material better.

[0032] The ZnO / SiO in the embodiments of the present invention 2 loading corrosion inhibitor material, by using long carbon chain and amino silane to modify ZnO / SiO 2 , endows the material with hydrophobic properties. Specifically, cetyltrimethoxysilane is a low surface energy substance, which is very easy to hydrolyze to generate cetylsilanol, and the hydroxyl groups at the end of its structure will undergo dehydration condensation with the hydroxyl groups on the surface of SiO 2 , so that the hydrophobic groups are firmly connected to the surface of SiO 2 particles, reducing the surface energy of the composite particles and thus having strong hydrophobicity; and at the same time, N,N-diethyl-3-aminopropyltrimethoxysilane containing tertiary amine groups is used for protonation and deprotonation, which is combined with ZnO / SiO 2 , which can further improve the hydrophobic performance of the material; and using absolute ethanol as a solvent can make the low surface energy substance and the modified substance contact and mix more fully, and then react to achieve a better hydrophobic modification effect, with good modification effect and low price.

[0033] In some specific embodiments, in step S1, the mass ratio of cetyltrimethoxysilane to N,N-diethyl-3-aminopropyltrimethoxysilane is 1:(1-3), and non-limiting examples are: 1:1, 1:1.5, 1:2, 1:3, etc.

[0034] In some specific embodiments, in step S2, the mass ratio of ZnO to SiO 2 is 1:(0.5-1.5), and non-limiting examples are: 1:0.5, 1:1, 1:1.2, 1:1.5, etc.

[0035] In some specific embodiments, in step S2, the temperature of ultrasonic stirring is 25-35°C, and non-limiting examples are: 25°C, 28°C, 30°C, 35°C, etc.; the time of ultrasonic stirring is 20-40 min, and non-limiting examples are: 20 min, 30 min, 35 min, 40 min, etc.

[0036] In some specific embodiments, in step S3, the reaction temperature of the hydrolysis polycondensation reaction is 40 to 60 °C, non-limiting examples include: 40 °C, 45 °C, 50 °C, 60 °C, etc.; the reaction time is 1 to 3 h, non-limiting examples include: 1 h, 1.5 h, 2 h, 3 h, etc.

[0037] In some specific embodiments, in step S4, the mass-volume ratio of the corrosion inhibitor to deionized water and absolute ethanol is (0.5 to 1.5) g : (25 to 35) mL : (5 to 15) mL, non-limiting examples include: 0.5 g : 25 mL : 5 mL, 1 g : 30 mL : 10 mL, 1 g : 35 mL : 10 mL, 1.5 g : 35 mL : 15 mL, etc., and preferably 1 g : 30 mL : 10 mL.

[0038] In some specific embodiments, in step S4, the corrosion inhibitor is a conventional corrosion inhibitor in the art, including but not limited to benzotriazole, cyclohexylamine carbonate, diammonium hydrogen phosphate, etc.

[0039] In some specific embodiments, in step S4, the reaction temperature of the stirring reaction is 20 to 40 °C, non-limiting examples include: 20 °C, 25 °C, 30 °C, 40 °C, etc.; the reaction time is 10 to 14 h, non-limiting examples include: 10 h, 11 h, 12 h, 13 h, 14 h, etc.

[0040] Another aspect of the embodiments of the present invention further provides a ZnO / SiO 2 corrosion inhibitor-loaded material, which is prepared by the above preparation method. This material has good corrosion inhibition performance and also has hydrophobicity, and can effectively protect metal materials from corrosion.

[0041] Another aspect of the embodiments of the present invention further provides the application of the above ZnO / SiO 2 corrosion inhibitor-loaded material in the field of metal anti-corrosion protection.

[0042] The technical solution of the present invention will be further described in detail below with specific embodiments. The raw materials used in the embodiments are all commercially available products.

[0043] Example 1

[0044] This example provides a preparation method of a ZnO / SiO 2 corrosion inhibitor-loaded material, including the following steps:

[0045] S1: Add 0.5 g of hexadecyltrimethoxysilane (HDTMS) and 1 g of N,N-diethyl-3-aminopropyltrimethoxysilane (DMPTMS) to absolute ethanol, stir and mix at room temperature for 30 min to carry out a silane modification reaction to obtain solution A;

[0046] S2: Add 0.2 g of ZnO and 0.2 g of SiO 2 to absolute ethanol, and ultrasonically stir for 30 min to obtain solution B;

[0047] S3: Mix solution A and solution B, add 2 g of deionized water, and carry out hydrolysis polycondensation at 50 °C for 2 h;

[0048] S4: Prepare a mixed solution of benzotriazole, deionized water and absolute ethanol in proportion (wherein, benzotriazole: deionized water: absolute ethanol = 1 g: 30 mL: 10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 30 °C under water bath conditions for 12 h. After the reaction is completed, the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained.

[0049] Example 2

[0050] This example provides a method for preparing a ZnO / SiO 2 corrosion inhibitor-loaded material, which includes the following steps:

[0051] S1: Add 1 g of hexadecyltrimethoxysilane (HDTMS) and 1 g of N,N-diethyl-3-aminopropyltrimethoxysilane (DMPTMS) to absolute ethanol, stir and mix at room temperature for 20 min to carry out silane modification reaction to obtain solution A;

[0052] S2: Add 0.2 g of ZnO and 0.1 g of SiO 2 to absolute ethanol, and ultrasonically stir for 20 min to obtain solution B;

[0053] S3: Mix solution A and solution B, add 2 g of deionized water, and carry out hydrolysis polycondensation at 40 °C for 2 h;

[0054] S4: Prepare a mixed solution of cyclohexylamine carbonate, deionized water and absolute ethanol in proportion (wherein, cyclohexylamine carbonate: deionized water: absolute ethanol = 1 g: 30 mL: 10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 20 °C under water bath conditions for 10 h. After the reaction is completed, the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained.

[0055] Example 3

[0056] This example provides a method for preparing a ZnO / SiO 2 corrosion inhibitor-loaded material, which includes the following steps:

[0057] S1: Add 1 g of hexadecyltrimethoxysilane (HDTMS) and 3 g of N,N - diethyl - 3 - aminopropyltrimethoxysilane (DMPTMS) into absolute ethanol, stir and mix at room temperature for 40 min to conduct the silane modification reaction, obtaining solution A;

[0058] S2: Add 0.2 g of ZnO and 0.3 g of SiO 2 into absolute ethanol, stir ultrasonically for 40 min to obtain solution B;

[0059] S3: Mix solution A and solution B, and add 2 g of deionized water, then conduct hydrolysis and polycondensation at 60 °C for 3 h;

[0060] S4: Prepare a mixed solution of diammonium hydrogen phosphate, deionized water and absolute ethanol in proportion (where diammonium hydrogen phosphate:deionized water:absolute ethanol = 1 g:30 mL:10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 40 °C in a water bath for 10 h. After the reaction ends, the ZnO / SiO 2 corrosion inhibitor - loaded material can be obtained.

[0061] Example 4

[0062] This example provides a preparation method of a ZnO / SiO 2 corrosion inhibitor - loaded material, including the following steps:

[0063] S1: Add 0.5 g of hexadecyltrimethoxysilane (HDTMS) and 1.5 g of N,N - diethyl - 3 - aminopropyltrimethoxysilane (DMPTMS) into absolute ethanol, stir and mix at room temperature for 30 min to conduct the silane modification reaction, obtaining solution A;

[0064] S2: Add 0.2 g of ZnO and 0.3 g of SiO 2 into absolute ethanol, stir ultrasonically for 30 min to obtain solution B;

[0065] S3: Mix solution A and solution B, and add 2 g of deionized water, then conduct hydrolysis and polycondensation at 50 °C for 2 h;

[0066] S4: Prepare a mixed solution of benzotriazole, deionized water and absolute ethanol in proportion (where benzotriazole:deionized water:absolute ethanol = 1 g:30 mL:10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 40 °C in a water bath for 12 h. After the reaction ends, the ZnO / SiO 2 corrosion inhibitor - loaded material can be obtained.

[0067] Example 5

[0068] This embodiment provides a preparation method of ZnO / SiO 2 corrosion inhibitor-loaded material, comprising the following steps:

[0069] S1: Add 1 g of hexadecyltrimethoxysilane (HDTMS) and 1.5 g of N,N-diethyl-3-aminopropyltrimethoxysilane (DMPTMS) into absolute ethanol, stir and mix at room temperature for 30 min to carry out a silane modification reaction to obtain solution A;

[0070] S2: Add 1 g of ZnO and 0.5 g of SiO 2 into absolute ethanol, ultrasonically stir for 20 min to obtain solution B;

[0071] S3: Mix solution A and solution B, add 2 g of deionized water, and carry out hydrolysis and polycondensation at 50 °C for 3 h;

[0072] S4: Prepare a mixed solution of cyclohexylamine carbonate, deionized water and absolute ethanol in proportion (where cyclohexylamine carbonate: deionized water: absolute ethanol = 1 g: 30 mL: 10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 30 °C in a water bath for 10 h. After the reaction is completed, the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained.

[0073] Example 6

[0074] This embodiment provides a preparation method of ZnO / SiO 2 corrosion inhibitor-loaded material, comprising the following steps:

[0075] S1: Add 1.5 g of hexadecyltrimethoxysilane (HDTMS) and 3 g of N,N-diethyl-3-aminopropyltrimethoxysilane (DMPTMS) into absolute ethanol, stir and mix at room temperature for 20 min to carry out a silane modification reaction to obtain solution A;

[0076] S2: Add 2 g of ZnO and 3 g of SiO 2 into absolute ethanol, ultrasonically stir for 30 min to obtain solution B;

[0077] S3: Mix solution A and solution B, add 2 g of deionized water, and carry out hydrolysis and polycondensation at 60 °C for 3 h;

[0078] S4: Prepare a mixed solution of diammonium hydrogen phosphate, deionized water and absolute ethanol in proportion (where diammonium hydrogen phosphate: deionized water: absolute ethanol = 1 g: 30 mL: 10 mL), then immerse the reaction product obtained in step S3 into the mixed solution, and stir and react at 40 °C in a water bath for 14 h. After the reaction is completed, the ZnO / SiO 2Load corrosion inhibitor material.

[0079] Test Example 1

[0080] The ZnO / SiO prepared in Examples 1-6 of the present invention 2 Load corrosion inhibitor material was tested for corrosion performance, and an accelerated corrosion experiment (salt water immersion test) with an artificial defect coating was used. The artificial defect coating is generally obtained by scratching the coating surface with a scribing tool. Refer to ASTM-D1654 (Evaluation of the Corrosion Resistance of Brush-Coated / Sprayed Specimens in a Corrosive Environment) and ASTM-B117 (Standard Operating Procedure for Salt Spray Test Chambers). The specific experimental steps for preparing the defect coating by scratching are as follows: Use a scalpel and a ruler to assist in making a straight artificial defect on the coating surface with a length of 1.0 cm, a width of 50 μm, and a depth reaching the substrate (whether the scalpel reaches the metal substrate is judged by the magnitude of the contact resistance measured by a multimeter), and control the force used for each scratch to be the same to ensure the consistency of the defects. Immerse the defect coating sample in 60 mL of 3.5 wt.% NaCl solution (100 mL beaker), observe the corrosion condition of the coating surface at regular intervals, and weigh and calculate the corrosion rate after surface treatment.

[0081] According to the above method, the ZnO / SiO prepared in Examples 1-6 of the present invention 2 Load corrosion inhibitor material was tested, and the results are shown in Table 1.

[0082] Table 1 Anti-corrosion performance of the ZnO / SiO 2 Load corrosion inhibitor material

[0083] Serial number Specimen Corrosion rate 1 Blank specimen 48 μg / d 2 Example 1 8 μg / d 3 Example 2 9 μg / d 4 Example 3 9 μg / d 5 Example 4 12 μg / d 6 Example 5 10 μg / d 7 Example 6 11 μg / d

[0084] It can be seen from the test data in Table 1 that compared with the blank sample without the ZnO / SiO 2 Load corrosion inhibitor material, the ZnO / SiO in Examples 1-6 of the present invention 2 Load corrosion inhibitor material has a lower corrosion rate than the blank sample. In particular, the ZnO / SiO 2 Load corrosion inhibitor material prepared in Example 1 of the present invention has the smallest corrosion rate (8 μg / d), which is only 1 / 6 of the corrosion rate of the blank sample (48 μg / d). This quantitative experimental result proves that the ZnO / SiO 2 Load corrosion inhibitor material prepared in the examples of the present invention has good corrosion inhibition and anti-corrosion performance.

[0085] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection 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, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A preparation method of ZnO / SiO 2 corrosion inhibitor-loaded material It is characterized in that it includes the following steps: S1: Add cetyltrimethoxysilane and N,N-diethyl-3-aminopropyltrimethoxysilane into absolute ethanol, stir and mix at room temperature for 20 - 40 min to carry out a silane modification reaction to obtain solution A; S2: Add ZnO and SiO 2 to absolute ethanol, and stir with ultrasonic to obtain solution B; wherein, the ZnO is micron particles; the SiO 2 is nanoparticles and has a nano-hollow mesoporous structure; S3: Mix solution A and solution B, and add deionized water to carry out a hydrolysis and polycondensation reaction; S4: Prepare a mixed solution of corrosion inhibitor, deionized water and absolute ethanol in proportion, then immerse the reaction product obtained in step S3 into the mixed solution, and carry out a stirring reaction under water bath conditions. After the reaction is completed, the ZnO / SiO 2 corrosion inhibitor-loaded material can be obtained.

2. The preparation method according to claim 1, it is characterized in that in step S1, the mass ratio of the cetyltrimethoxysilane to the N,N-diethyl-3-aminopropyltrimethoxysilane is 1:(1 - 3).

3. The preparation method according to claim 1, it is characterized in that In step S2, the mass ratio of the ZnO to the SiO 2 is 1:(0.5 to 1.5).

4. The preparation method according to claim 1, it is characterized in that in step S2, the temperature of the ultrasonic stirring is 25 - 35 °C; the time of the ultrasonic stirring is 20 - 40 min.

5. The preparation method according to claim 1, it is characterized in that in step S3, the reaction temperature of the hydrolysis and polycondensation reaction is 40 - 60 °C, and the reaction time is 1 - 3 h.

6. The preparation method according to claim 1, it is characterized in that in step S4, the mass-volume ratio of the corrosion inhibitor to the deionized water and the absolute ethanol is (0.5 - 1.5) g:(25 - 35) mL:(5 - 15) mL.

7. The preparation method according to claim 6, it is characterized in that in step S4, the mass-volume ratio of the corrosion inhibitor to the deionized water and the absolute ethanol is 1 g:30 mL:10 mL.

8. The preparation method according to claim 1, it is characterized in that in step S4, the reaction temperature of the stirring reaction is 20 - 40 °C, and the reaction time is 10 - 14 h.

9. A ZnO / SiO 2 corrosion inhibitor-loaded material, It is characterized in that The ZnO / SiO 2 The corrosion inhibitor-loaded material is prepared by the preparation method according to any one of claims 1-8.

10. Application of the ZnO / SiO 2 corrosion inhibitor-loaded material in the field of metal anti-corrosion protection.