Water-based corrosion and rust prevention coating and preparation method thereof

Abstract

This invention relates to the field of anti-corrosion coating technology, specifically to a water-based corrosion-inhibiting anti-corrosion coating and its preparation method. When zinc phosphate is used alone as a corrosion inhibitor in water-based anti-corrosion coatings, it tends to agglomerate and has poor compatibility with resins. The protective coating formed on the metal surface by these water-based anti-corrosion coatings exhibits poor and unstable corrosion resistance. To address these problems, this invention provides a water-based corrosion-inhibiting anti-corrosion coating composed of two components, A and B. Component A contains a self-made composite corrosion inhibitor, ZnP-PEG-IPTS-GO. This composite corrosion inhibitor, through the bridging of IPTS, chemically bonds GO, PEG, and zinc phosphate, achieving an organic combination of "physical shielding" and "active passivation," significantly improving the overall anti-corrosion performance of the coating.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to a water-based corrosion-inhibiting anti-corrosion coating and its preparation method. Background Technology

[0002] Waterborne anti-corrosion coatings have become an important development direction in the field of corrosion protection due to their low volatile organic compound (VOC) content and environmental friendliness. Among them, the waterborne two-component hydroxyl acrylic-polyurethane system combines the weather resistance and flexibility of acrylic resin with the abrasion resistance and high hardness of polyurethane, showing broad application prospects.

[0003] However, the corrosion resistance of this system largely depends on the added corrosion inhibitors. Traditional corrosion inhibitors, such as zinc phosphate and aluminum tripolyphosphate, are usually introduced into the coating system through physical blending, which has the following inherent drawbacks: First, they have poor compatibility with the resin matrix, are prone to aggregation or precipitation from the coating, leading to coating defects and reduced long-term corrosion resistance; second, they have weak interfacial bonding with the substrate, making it difficult to form a strong and dense protective layer on the metal surface; third, there is a lack of synergistic effect between various corrosion-resistant components (such as physical barrier and chemical passivation types), limiting the improvement of overall corrosion resistance.

[0004] Graphene oxide (GO) is considered an ideal physical barrier material due to its unique layered structure and excellent barrier properties; however, it tends to aggregate in aqueous systems and has poor compatibility with resins. Zinc phosphate, on the other hand, is a classic passivating corrosion inhibitor. Current technologies attempt to combine the two in simple ways, but these are mostly physical mixtures with weak interfacial bonding, failing to fully leverage the synergistic effect of "physical barrier" and "chemical passivation."

[0005] Therefore, developing a novel composite corrosion inhibitor that is well compatible with resin matrices, firmly bonded to metal substrates, and capable of achieving efficient synergy of different anti-corrosion mechanisms is crucial for improving the overall anti-corrosion performance of waterborne two-component coatings, which is also the starting point of this invention. Summary of the Invention

[0006] The existing technology has the following problems: when zinc phosphate is used alone as a corrosion inhibitor in water-based anti-corrosion coatings, it is prone to agglomeration and has poor compatibility with resins. The protective coating formed by the water-based anti-corrosion coating on the metal surface has poor and unstable anti-corrosion performance. To address the above technical problems, this invention provides a water-based corrosion inhibitor coating, which, by weight ratio, comprises component A and component B, with a mass ratio of component A to component B of 4:1 to 6:1. Component A, by weight, comprises the following components:

[0007] Aqueous hydroxyacrylic acid dispersion, 60.0-75.0 parts;

[0008] Rutile titanium dioxide 15.0 - 20.0 parts;

[0009] Barium sulfate 3.0 - 5.0 parts;

[0010] Film-forming aid 2.0 - 4.0 parts;

[0011] 3.0-8.0 parts of composite corrosion inhibitor;

[0012] 0.2-0.5 parts of flash rust inhibitor;

[0013] 5.0 - 10.0 parts of deionized water;

[0014] Wetting and dispersing agent: 0.5-1.0 parts;

[0015] Defoamer 0.2-0.5 parts;

[0016] Leveling agent 0.2-0.5 parts;

[0017] Component B is a hydrophilic modified aliphatic polyisocyanate.

[0018] Preferably, the composite corrosion inhibitor is ZnP-PEG-IPTS-GO, and the preparation method includes the following steps:

[0019] (1) The silanol groups formed by the hydrolysis of the ethoxy group of IPTS condense with the hydroxyl groups (-OH) on the surface of GO obtained by the modified Hummers method to form Si-OC covalent bonds, thus obtaining IPTS-GO;

[0020] (2) The isocyanate group (-NCO) in the IPTS-GO structure and the hydroxyl group (-OH) at the end of the PEG chain form a carbamate bond (-NH-COO-) under the action of a catalyst. The hydrophilic segment of PEG is introduced into the silane-modified GO structure to obtain PEG-IPTS-GO.

[0021] (3) Disperse PEG-IPTS-GO in deionized water, and add zinc nitrate while stirring. Stirring the reaction allows the oxygen-containing functional groups in the reaction system to react with Zn. 2+ A coordination reaction occurred to obtain zinc-coordinated modified PEG-IPTS-GO. After the reaction was complete, disodium hydrogen phosphate was added to the reaction system, and the reaction was stirred under weakly acidic conditions, resulting in the in-situ formation of zinc phosphate crystals on the surface of the zinc-coordinated modified PEG-IPTS-GO. After the reaction was complete, impurities were removed by dialysis with deionized water, and finally, ZnP-PEG-IPTS-GO was obtained by freeze-drying. During the reaction, the ether oxygen atoms on the PEG segments and the remaining oxygen-containing functional groups on the GO segments in PEG-IPTS-GO reacted with Zn. 2+ Coordination occurs, followed by interaction with PO4. 3-The reaction generates and firmly anchors zinc phosphate crystals in situ on the surface of the nanosheets.

[0022] Preferably, step (1) is as follows:

[0023] (1) Under ice-water bath, the GO obtained by the modified Hummers method was uniformly dispersed in 100 mL of anhydrous ethanol to obtain a GO dispersion of 0.5-2 mg / mL;

[0024] (2) Under nitrogen protection, 50-100 μL of IPTS is added dropwise to the GO dispersion while stirring. After the addition is complete, the reaction is stirred at 60-70℃ for at least 4 hours. After the reaction is complete, the product is washed with ethanol by centrifugation at least 3 times until there is no obvious oily substance in the supernatant. The solid product is collected and dried to obtain IPTS-GO.

[0025] Preferably, step (2) is as follows:

[0026] (1) Disperse all the IPTS-GO obtained in step (1) uniformly in 100 mL of anhydrous ethanol to obtain IPTS-GO dispersion;

[0027] (2) Under nitrogen protection, 0.2-0.5 g PEG1000 and 10-20 μL DBTDL were added to the IPTS-GO dispersion and stirred at 70-80℃ for at least 6 h. After the reaction was completed, the solid product was collected and washed with anhydrous ethanol by centrifugation at least 3 times. After drying, PEG-IPTS-GO was obtained.

[0028] Preferably, step (3) is as follows:

[0029] Disperse all of the PEG-IPTS-GO obtained in step (2) in 50 mL of deionized water to obtain a PEG-IPTS-GO dispersion;

[0030] Add 149 mg of zinc nitrate to the PEG-IPTS-GO dispersion and stir until homogeneous. Then stir for at least 20 min. Next, add 156 mg of disodium hydrogen phosphate to the reaction system and stir until homogeneous. Adjust the pH of the reaction system to 5-6 and stir at 60-80℃ for at least 2 h. After the reaction is complete, put the obtained product into a dialysis bag (molecular weight cutoff 8000-14000 Da) and dialyze with deionized water for at least 30 h, changing the water at least 4 times. Finally, freeze-dry the dialyzed product to obtain a black powder product, namely the composite corrosion inhibitor ZnP-PEG-IPTS-GO.

[0031] Preferably, the wetting and dispersing agent is a high molecular weight wetting and dispersing agent.

[0032] Preferably, the defoamer is a polyether siloxane defoamer.

[0033] Preferably, the film-forming aid includes at least one of Eastman Texanol, alcohol ester-12, and propylene glycol methyl ether.

[0034] Preferably, the flash rust inhibitor is sodium molybdate or 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid.

[0035] Preferably, the leveling agent is an acrylate leveling agent. Beneficial effects

[0036] (1) The present invention obtains a composite corrosion inhibitor ZnP-PEG-IPTS-GO, wherein ZnP-PEG-IPTS-GO combines the excellent physical barrier effect of graphene oxide (GO), the chemical passivation function of zinc phosphate (ZnP), and the improved interfacial compatibility and dispersibility of polyethylene glycol (PEG) segments. The three components produce a synergistic effect through chemical bonding, which overcomes the defects of weak interfacial bonding and single function of traditional physical blend materials, thereby realizing the organic combination of "physical shielding" and "active passivation", significantly improving the comprehensive anti-corrosion performance of the coating;

[0037] (2) Through the "bridging" effect of IPTS silane coupling agent and the introduction of PEG hydrophilic segments, GO, which is originally prone to agglomeration, can be stably and uniformly dispersed in waterborne hydroxyl acrylic resin. This not only avoids coating defects caused by agglomeration, but also greatly enhances the interfacial compatibility and bonding force between the corrosion inhibitor and the resin matrix through chemical bonding, effectively preventing the precipitation and failure of the active ingredients, and ensuring the long-term and stable anti-corrosion ability of the coating;

[0038] (3) The PEG segments and oxygen-containing functional groups in the composite corrosion inhibitor can effectively adsorb onto the metal surface. More importantly, the zinc phosphate crystals generated in situ and firmly anchored on the GO sheets can preferentially form a dense passivation protective film on the metal substrate surface when the coating is damaged or the medium penetrates, realizing the upgrade from "passive shielding" to "active repair", which greatly delays the corrosion process of the metal substrate;

[0039] (4) The coating system of the present invention is not only low in VOC, but can also be rapidly cured at room temperature to form a paint film with excellent adhesion, hardness and leveling properties. The addition of flash rust inhibitor in the formulation further ensures the immediate protection of the metal substrate during the application of the coating and prevents flash rust from forming. Detailed Implementation

[0040] The present invention will be described in detail below with reference to embodiments. However, it should be understood that the following embodiments are merely illustrative examples of implementation of the present invention and are not intended to limit the scope of the present invention.

[0041] The composite corrosion inhibitor used in the following embodiments of the present invention is prepared by the following method:

[0042] (1) 100 mg of GO obtained by the modified Hummers method was dispersed in 100 mL of anhydrous ethanol and ultrasonicated in a water bath (power 300 W) to obtain a GO dispersion;

[0043] (2) Transfer the above GO dispersion to a 250 mL three-necked flask. Under nitrogen protection and magnetic stirring, slowly add 75 μL of 3-propyltriethoxysilane 3-isocyanate (IPTS) to the GO dispersion using a constant pressure dropping funnel, controlling the dropping rate to 1 drop / second. After the addition is complete, stir the mixture at 65 °C for 5 hours. After the reaction is complete, transfer the mixture to a centrifuge tube and wash it three times with anhydrous ethanol at 10,000 rpm to obtain IPTS-GO solid.

[0044] (3) The above IPTS-GO was uniformly dispersed in 100 mL of anhydrous ethanol, and then 0.35 g of polyethylene glycol (PEG, Mn=1000) and 15 μL of dibutyltin dilaurate (DBTDL) catalyst were added. The reaction was carried out under nitrogen protection and stirred at 75 °C for 7 h. After the reaction was completed, the solid PEG-IPTS-GO was obtained by centrifugation and washing three times with anhydrous ethanol at a speed of 10000 rpm.

[0045] (4) Disperse the above PEG-IPTS-GO in 50 mL of deionized water, add 149 mg zinc nitrate (1 mmol) and 156 mg disodium hydrogen phosphate (1.1 mmol) in sequence, then adjust the pH of the reaction system to 5.5 with 0.1 M sodium hydroxide aqueous solution, and stir the reaction at 70 °C for 3 h. After the reaction is completed, put the obtained product into a dialysis bag (molecular weight cutoff 12000-14000 Da), dialyze with deionized water for 30 h, changing the water 4 times during the period. Finally, freeze dry the dialyzed product to obtain the final black powder product, which is called ZnP-PEG-IPTS-GO composite corrosion inhibitor.

[0046] The aqueous hydroxy acrylic dispersion used in the following examples of the present invention is Allnex's SETAQUA® 6513.

[0047] The hydrophilic modified aliphatic polyisocyanate used in the following examples of the present invention is Covestro Bayhydur XP2487 / 1.

[0048] The rutile titanium dioxide used in the following embodiments of the present invention is Chemours R-960.

[0049] The GO obtained by the improved Hummers method used in this invention can be prepared in-house according to literature or purchased externally. The GO used in the following examples and comparative examples is graphene oxide produced by Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., with a sheet diameter of 0.5-5 μm, a thickness of 1-3 nm, and product number XF003. Example

[0050] A water-based corrosion-inhibiting coating comprises, by mass ratio, component A and component B, with a mass ratio of component A to component B of 4:1. Component A, by weight, comprises the following components:

[0051] 60.0 parts of aqueous hydroxyl acrylic acid dispersion;

[0052] 15.0 parts of rutile titanium dioxide;

[0053] Barium sulfate 3.0 parts;

[0054] Eastman Texanol 2.0 pcs;

[0055] 3.0 parts of composite corrosion inhibitor;

[0056] Sodium molybdate 0.2 parts;

[0057] 5.0 parts of deionized water;

[0058] BYK-190 0.5 copies;

[0059] TEGO Foamex 810 0.2 copies;

[0060] BYK-361 N 0.2 copies;

[0061] Component B is a hydrophilic modified aliphatic polyisocyanate. Example

[0062] A water-based corrosion-inhibiting coating comprises, by weight, component A and component B, with a mass ratio of 5:1. Component A, by weight, comprises the following components:

[0063] 70 parts of aqueous hydroxy acrylic acid dispersion;

[0064] 18 parts of rutile titanium dioxide;

[0065] 4 parts barium sulfate;

[0066] Alcohol ester-12 3 parts;

[0067] 5 parts of composite corrosion inhibitor;

[0068] 0.2-0.5 parts of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid;

[0069] 7 parts deionized water;

[0070] BYK-190 0.6 copies;

[0071] TEGO Foamex 810 0.3 copies;

[0072] BYK-361 N 0.4 copies;

[0073] Component B is a hydrophilic modified aliphatic polyisocyanate. Example

[0074] A water-based corrosion-inhibiting coating comprises, by weight, component A and component B, with a mass ratio of 6:1. Component A, by weight, comprises the following components:

[0075] 75.0 parts of aqueous hydroxyl acrylic acid dispersion;

[0076] 20.0 parts of rutile titanium dioxide;

[0077] 5.0 parts of barium sulfate;

[0078] 4.0 parts of propylene glycol methyl ether;

[0079] 8.0 parts of composite corrosion inhibitor;

[0080] 0.5 parts of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid;

[0081] 10.0 parts deionized water;

[0082] BYK-190 1.0 copy;

[0083] TEGO Foamex 810 0.5 copies;

[0084] BYK-361 N 0.5 copies;

[0085] Component B is a hydrophilic modified aliphatic polyisocyanate.

[0086] Comparative Example 1 is the same as Example 1, except that Comparative Example 1 uses a mixture of 100 mg GO and 390 mg zinc phosphate in equal weight parts to replace the composite corrosion inhibitor in Example 1.

[0087] Comparative Example 2 is the same as Example 1, except that Comparative Example 2 uses zinc phosphate in equal parts by weight to replace the composite corrosion inhibitor in Example 1.

[0088] Comparative Example 3 is the same as Example 1, except that in the preparation of the composite corrosion inhibitor in Comparative Example 3, PEG2000 is used instead of PEG1000 in Example 1.

[0089] Comparative Example 4 is the same as Example 1, except that in the preparation of the composite corrosion inhibitor in Comparative Example 4, PEG600 is used instead of PEG1000 in Example 1.

[0090] Comparative Example 5 is the same as Example 1, except that the amount of IPTS added during the preparation of the composite corrosion inhibitor in Comparative Example 5 is 150 μL.

[0091] Performance testing

[0092] The water-based corrosion-inhibiting and anti-corrosion coatings obtained in the examples and comparative examples were all used according to the following methods:

[0093] (1) According to the formula amount, first stir component A thoroughly until the color and state are uniform and there is no sediment;

[0094] (2) Add component B to component A according to the formula amount;

[0095] (3) Use a mechanical stirrer to stir thoroughly for 300-500 rpm for 3-5 minutes to ensure that the two components are completely and evenly mixed;

[0096] (4) Curing: The mixed coating needs to stand (curing) for about 10-15 minutes to allow the curing agent and resin to fully impregnate, and at the same time allow the air bubbles introduced during stirring to escape.

[0097] (5) Activation period: The mixed coating should be used within 2-4 hours (25℃). The higher the ambient temperature, the shorter the activation period. Once the coating shows significant thickening or gelation, it must be discontinued.

[0098] The performance test standards for the water-based corrosion-inhibiting and anti-corrosion coatings obtained in the embodiments and comparative examples of the present invention are as follows:

[0099] Pencil hardness: It is determined according to the 13 grades from 6B to 6H specified in GB / T6739-86.

[0100] Adhesion: Graded according to the rating standards specified in GB / T9286-88.

[0101] Salt water resistance: Tested according to GB / T1766-2008.

[0102] Salt spray resistance: Tested according to GB / T1771-2007.

[0103] Impact resistance: Tested according to the test method for impact resistance of paint film in GB / T1732-1993.

[0104] The specific test results are shown in Table 1:

[0105] Table 1

[0106] ;

[0107] As can be seen from the test results in Table 1, Examples 1-3 exhibited good and stable overall performance. The GO sheets in the ZnP-PEG-IPTS-GO structure formed a dense "maze" barrier in the coating, effectively delaying the penetration of water, oxygen, and corrosive ions. The zinc phosphate generated in situ on the surface of the composite corrosion inhibitor is firmly bonded to GO through chemical bonds, continuously releasing corrosion inhibitors at the damaged areas of the coating and forming a passivation protective film on the metal substrate. The PEG-IPTS bridging structure ensures excellent dispersion and interfacial bonding of GO in the resin, avoiding defects caused by agglomeration. The PEG segments and silane groups in PEG-IPTS-GO help improve compatibility with the resin and form a stronger interaction with the metal substrate. The inorganic fillers and resin system in the coating system provide a good balance between rigidity and toughness.

[0108] Comparative Example 1 used a mixture of 100 mg GO and 390 mg zinc phosphate in equal weight proportions. GO and zinc phosphate were simply physically mixed without forming chemical bonds, thus failing to achieve the synergistic corrosion inhibition effect of a composite corrosion inhibitor. In salt water resistance and salt spray resistance tests, the corrosion inhibition performance of the coating is crucial. The synergistic effect of the components in a composite corrosion inhibitor forms a denser and more stable protective film on the metal surface, effectively preventing contact between corrosive media such as water and salt. However, the mixture in Comparative Example 1, lacking chemical bonding and synergistic effect, formed a less dense and stable protective film, allowing corrosive media to penetrate the metal surface more easily. This resulted in significant loss of gloss, dense small bubbles, severe corrosion propagation at scratches, and large-area blistering on the surface.

[0109] Comparative Example 2 used only zinc phosphate as a corrosion inhibitor, lacking the physical barrier effect of GO. Corrosive media could quickly penetrate the coating and reach the metal surface; relying solely on the passivation effect of zinc phosphate was insufficient to maintain protection during long-term testing. The coating's "delay" effect on the media was weak, resulting in severe scratch propagation and dense blistering.

[0110] In Comparative Examples 3 and 4, the molecular weight of PEG changed during the preparation of the composite corrosion inhibitor, resulting in varying degrees of performance degradation. This demonstrates the crucial influence of PEG chain length on the interfacial structure. Excessive molecular weight of PEG2000 leads to overly long grafted polymer chains. Excessive steric hindrance may hinder the growth of Zn. 2+Effective coordination with the GO sheets resulted in uneven zinc phosphate deposition and reduced coverage. Excessively long hydrophilic chains may increase the coating's water absorption, ultimately leading to corrosion resistance far inferior to Example 1. The PEG600 molecular weight was too small, and the chain segments were too short. Insufficient steric stability and compatibility may result in poor dispersion of the modified GO in the resin or weakened interfacial bonding with the matrix resin, ultimately causing a decrease in adhesion and corrosion resistance.

[0111] In Comparative Example 5, during the preparation of the composite corrosion inhibitor, excessive IPTS was present. This excess IPTS not only reacted with GO during the reaction but also underwent self-polymerization, forming ungrafted siloxane oligomers. These hydrophobic oligomers have poor compatibility with the aqueous resin system and are prone to forming microscopic defects during film formation, becoming weak points for the penetration of corrosive media, thereby reducing the shielding performance and adhesion of the coating.

[0112] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A water-based corrosion-inhibiting and anti-corrosion coating, characterized in that, The product comprises, by mass ratio, component A and component B, with a mass ratio of component A to component B of 4:1 to 6:

1. Component A, by weight, comprises the following components: Aqueous hydroxyacrylic acid dispersion, 60.0-75.0 parts; Rutile titanium dioxide 15.0 - 20.0 parts; Barium sulfate 3.0 - 5.0 parts; Film-forming aid 2.0 - 4.0 parts; 3.0-8.0 parts of composite corrosion inhibitor; 0.2-0.5 parts of flash rust inhibitor; 5.0 - 10.0 parts of deionized water; Wetting and dispersing agent: 0.5-1.0 parts; Defoamer 0.2-0.5 parts; Leveling agent 0.2-0.5 parts; Component B is a hydrophilic modified aliphatic polyisocyanate; The composite corrosion inhibitor is ZnP-PEG-IPTS-GO, and its preparation method includes the following steps: (1) The silanol groups formed by the hydrolysis of the ethoxy group of IPTS undergo a condensation reaction with the hydroxyl groups on the surface of GO obtained by the modified Hummers method to generate Si-OC covalent bonds, thus obtaining IPTS-GO; the GO is graphene oxide; the IPTS is 3-propyltriethoxysilane; (2) The isocyanate group in the IPTS-GO structure and the hydroxyl group at the end of the PEG chain form a carbamate bond under the action of a catalyst to obtain PEG-IPTS-GO; the PEG is PEG1000; (3) Disperse PEG-IPTS-GO in deionized water, and add zinc nitrate while stirring. Stirring the reaction allows the oxygen-containing functional groups in the reaction system to react with Zn. 2+ A coordination reaction was conducted to obtain zinc-coordinated modified PEG-IPTS-GO. After the reaction was completed, disodium hydrogen phosphate was added to the reaction system and stirred under weakly acidic conditions. Zinc phosphate crystals were generated in situ on the surface of the zinc-coordinated modified PEG-IPTS-GO. After the reaction was completed, impurities were removed by dialysis with deionized water, and finally ZnP-PEG-IPTS-GO was obtained by freeze drying. The ZnP is zinc phosphate. Step (1) is as follows: (a) Under ice-water bath conditions, GO obtained by the modified Hummers method was uniformly dispersed in 100 mL of anhydrous ethanol to obtain a GO dispersion of 0.5-2 mg / mL; (b) Under nitrogen protection, 50-100 μL of IPTS was added dropwise to the GO dispersion while stirring. After the addition was complete, the mixture was stirred at 60-70 °C for at least 4 h. After the reaction was completed, the product was washed with ethanol by centrifugation at least 3 times until the supernatant was free of obvious oil. The solid product was collected and dried to obtain IPTS-GO.

2. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, Step (2) is as follows: (c) Disperse all the IPTS-GO obtained in step (1) uniformly in 100 mL of anhydrous ethanol to obtain IPTS-GO dispersion; (d) Under nitrogen protection, 0.2-0.5 g of PEG1000 and 10-20 μL of catalyst DBTDL were added to the IPTS-GO dispersion and stirred at 70-80 °C for at least 6 h. After the reaction was completed, the solid product was collected and washed with anhydrous ethanol by centrifugation at least 3 times. After drying, PEG-IPTS-GO was obtained.

3. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, Step (3) is as follows: Disperse all of the PEG-IPTS-GO obtained in step (2) in 50 mL of deionized water to obtain a PEG-IPTS-GO dispersion; Add 149 mg of zinc nitrate to the PEG-IPTS-GO dispersion and stir until homogeneous. Then stir for at least 20 min. Next, add 156 mg of disodium hydrogen phosphate to the reaction system and stir until homogeneous. Adjust the pH of the reaction system to 5-6 and stir at 60-80℃ for at least 2 h. After the reaction is complete, put the obtained product into a dialysis bag and dialyze with deionized water for at least 30 h, changing the water at least 4 times. Finally, freeze-dry the dialyzed product to obtain a black powder product, namely the composite corrosion inhibitor ZnP-PEG-IPTS-GO.

4. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, The wetting and dispersing agent is a high molecular weight wetting and dispersing agent.

5. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, The defoamer is a polyether siloxane defoamer.

6. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, The film-forming aid includes at least one of alcohol ester-12 and propylene glycol methyl ether.

7. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, The flash rust inhibitor is sodium molybdate or 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid.

8. The water-based corrosion-inhibiting and anti-corrosion coating according to claim 1, characterized in that, The leveling agent is an acrylate leveling agent.