Wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent and application thereof

Abstract

This invention discloses a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent and its application, relating to the field of material corrosion and wear protection technology. The sealing agent is made of the following components by weight: 1 part MoS2 precursor, 20-50 parts water-based organosilicon-modified acrylic resin, 50-75 parts deionized water, and 0.5-1 part surfactant. The prepared sealing agent combines organic corrosion-resistant sealing materials and inorganic lubricating phase materials to construct a new type of hybrid sealing material with stable and robust structure, so that the properties of the two can be effectively complementary, obtaining excellent properties that single materials do not have, and achieving a comprehensive improvement in the corrosion resistance and friction and wear resistance of the coated workpiece.

Description

Technical Field

[0001] This invention relates to the field of material corrosion and wear protection technology, specifically to a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent and its application. Background Technology

[0002] Plasma spraying coatings are widely used in aerospace, marine, and mining industries due to their high hardness, corrosion resistance, and wear resistance. However, plasma spraying coatings are formed by melting powder with a high-temperature plasma flame and impacting the substrate, inevitably leading to porosity defects in their microstructure. These defects affect the coating's overall performance, including corrosion resistance, wear resistance, and thermal insulation. To increase the coating's service life and reduce its porosity, subsequent treatments are necessary to minimize or eliminate porosity and prevent direct contact between the metal substrate and corrosive media. Sealing agents, with their wide range of material selection, significant economic benefits, simple operation, and strong practicality, have become the most common method for improving the corrosion resistance of coatings.

[0003] Currently, commonly used sealing agents include organic and inorganic sealing agents. Organic sealing agents generally include epoxy resins, silicone resins, phenolic resins, etc., which have the advantages of low curing shrinkage and stable chemical properties, but they have certain limitations on the operating temperature and are harmful to the environment. Inorganic sealing agents include phosphates, silicates, cerium salts, etc., which have received widespread attention in recent years due to their green and pollution-free nature and high temperature resistance.

[0004] Chinese patent document CN202110005890.5 discloses a sealing agent for plasma spraying gradient thermal barrier coatings and its application method. The sealing agent includes an organosilicon resin, a filler, a curing agent, and a catalyst, wherein: the weight percentage content of the organosilicon resin is 40-60%; the weight percentage content of the filler is 30-40%; the weight percentage content of the curing agent is 10-20%; and the weight percentage content of the catalyst is 5-10%. The organosilicon resin is a modified organosilicon resin modified by acrylic resin, epoxy resin, or alkyd resin.

[0005] However, its penetration is poor, and it has little effect on improving the corrosion resistance of the coating. In addition, when the coated workpiece is in service under complex working conditions, it will also be subject to mechanical wear, and even the synergistic effect of corrosion and wear, which seriously affects the working efficiency and service life of the workpiece. Current sealing agents cannot effectively solve the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent and its application. This agent combines organic corrosion-resistant sealing materials and inorganic lubricating phase materials to construct a novel hybrid sealing material with a stable and robust structure. This allows the properties of the two materials to complement each other effectively, achieving superior properties that are not available in single materials, and comprehensively improving the corrosion resistance and friction and wear resistance of the coated workpiece.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent, by weight, is made of the following components: 1 part of MoS2 precursor, 20-50 parts of waterborne organosilicon-modified acrylic resin, 50-75 parts of deionized water, and 0.5-1 part of surfactant.

[0009] Preferably, the MoS2 precursor is prepared by mixing sodium molybdate and thiourea in a molar ratio of 1:2 to 5.

[0010] Preferably, the surfactant is one or more of BYK-024 defoamer, BYK-156 dispersant, and BYK-346 wetting agent.

[0011] Preferably, the product is made from the following components in parts by weight: 1 part MoS2 precursor, 35 parts waterborne silicone-modified acrylic resin, 60 parts deionized water, and 0.8 parts surfactant.

[0012] Preferably, the preparation method of the waterborne organosilicon-modified acrylic resin includes the following steps:

[0013] This invention also claims the application of the aforementioned wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent in sealing, comprising the following steps:

[0014] (1) First, mix deionized water and organosilicon-modified acrylic resin, stir evenly, then add MoS2 precursor and surfactant, and continue stirring until the solution is completely and evenly mixed.

[0015] (2) Place the pretreated sprayed coating sample in the mixed solution obtained in step (1) and perform ultrasonic treatment and vacuum impregnation treatment in sequence, repeating each three times;

[0016] (3) Transfer the solution and sample to a high-pressure reactor, keep it warm for reaction, and after the reactor cools down naturally with the furnace, take out the sample and grind off the excess sealing agent on the surface to complete the sealing process of the organic-inorganic hybrid sealing agent.

[0017] Preferably, in step (2), the surface pretreatment of the sprayed coating sample includes rust removal, sanding, cleaning and degreasing, and drying.

[0018] Preferably, in step (2), the ultrasound time is 20 to 40 minutes.

[0019] Preferably, in step (2), the vacuum impregnation pressure is -0.09 MPa and the time is 20 to 50 minutes.

[0020] Preferably, in step (3), the reaction conditions are maintained at 200-240°C for 18-24 hours.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) This invention provides a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent. The organic component of the sealing agent, water-based organosilicon-modified acrylic resin, is more resistant to high temperatures, has better adsorption properties, is environmentally friendly and healthy, and is more stable and safe when mixed with chemical materials. It can effectively fill pores in coating sealing. The inorganic material MoS2 in the sealing agent is synthesized in situ in the coating pores through a hydrothermal reaction using precursors sodium molybdate and thiourea to generate MoS2 nanoparticles that have a lubricating effect. These nanoparticles are directly and uniformly dispersed in the organosilicon-modified acrylic resin by surfactant modification, and then penetrated into deeper coating pores by ultrasonic and vacuum impregnation methods, which can significantly improve the tribological properties of plasma-sprayed coatings. In the high-temperature and high-pressure hydrothermal reactor environment, the water-based organosilicon-modified acrylic resin can achieve a deeper penetration depth than conventional sealing methods, resulting in a significant reduction in coating porosity.

[0023] 2) This invention provides the application of stearic acid wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent. Through the careful regulation and design of organic-inorganic hybrid sealing agent with functional objectives, organic corrosion-resistant sealing material and inorganic lubricating phase material are combined to construct a new type of hybrid sealing material with stable and robust structure. The performance of the two can be effectively complemented, and excellent performance not possessed by single materials can be obtained, thereby achieving a comprehensive improvement in the corrosion resistance and friction and wear resistance of coated workpieces. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some schematic diagrams of certain embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 TEM and EDS images of the wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent provided by this invention;

[0026] Figure 2XRD and FTIR images of the wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent provided by this invention;

[0027] Figure 3 SEM images of the surface and cross-section of the high-entropy alloy coating after treatment with the wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent provided by this invention;

[0028] Figure 4 This is a comparison of Tafel polarization curves before and after the sealing treatment of the iron-based amorphous plasma spray coating in Example 1;

[0029] Figure 5 This is a comparison chart of the friction coefficients before and after the sealing treatment of the iron-based amorphous plasma spray coating in Example 1. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0031] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

[0032] The present invention will be further described below through specific embodiments.

[0033] Example 1

[0034] The application of a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent in pore sealing includes the following steps:

[0035] (1) First, mix 75g of deionized water and 50g of organosilicon modified acrylic resin. After stirring evenly, add 1g of MoS2 precursor (sodium molybdate and thiourea molar ratio 1:5) and 1g of surfactant (BYK-024 defoamer, BYK-156 dispersant and BYK-346 wetting agent mixed together). Continue stirring until the solution is completely and evenly mixed.

[0036] (2) The plasma-sprayed iron-based amorphous coating is pretreated by rust removal, sanding, cleaning and degreasing and drying. Then it is placed in the above mixed solution for ultrasonic treatment for 30 minutes. After taking it out, it is placed in a vacuum drying oven with a pressure of -0.09MPa for vacuum immersion for 30 minutes. The above two steps are repeated 3 times each.

[0037] (3) Transfer the solution and sample to a high-pressure reactor and keep it at 220°C for 22 hours. After the reactor cools down naturally with the furnace, take out the sample and grind off the excess sealing agent on the surface to complete the sealing process of the organic-inorganic hybrid sealing agent.

[0038] Example 2

[0039] The application of a wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent in pore sealing includes the following steps:

[0040] (1) First, mix 60g of deionized water and 35g of organosilicon modified acrylic resin. After stirring evenly, add 1g of MoS2 precursor (sodium molybdate and thiourea molar ratio 1:3) and 0.8g of surfactant (BYK-024 defoamer, BYK-156 dispersant and BYK-346 wetting agent mixed together). Continue stirring until the solution is completely and evenly mixed.

[0041] (2) The plasma-sprayed high-entropy alloy coating is pretreated by rust removal, sanding, cleaning and degreasing and drying. Then it is placed in the above mixed solution for ultrasonic treatment for 30 minutes. After taking it out, it is placed in a vacuum drying oven with a pressure of -0.09MPa for vacuum immersion for 30 minutes. The above two steps are repeated 3 times each.

[0042] (3) Transfer the solution and sample to a high-pressure reactor and keep it at 220°C for 22 hours. After the reactor cools down naturally with the furnace, take out the sample and grind off the excess sealing agent on the surface to complete the sealing process of the organic-inorganic hybrid sealing agent.

[0043] Comparative Example 1

[0044] The application of an inorganic sealing agent in pore sealing includes the following steps:

[0045] (1) Add 1g of MoS2 precursor (sodium molybdate and thiourea molar ratio 1:3) to 60g of deionized water and stir until the solution is completely and uniformly mixed.

[0046] (2) The plasma-sprayed high-entropy alloy coating is pretreated by rust removal, sanding, cleaning and degreasing and drying. Then it is placed in the above mixed solution for ultrasonic treatment for 30 minutes. After taking it out, it is placed in a vacuum drying oven with a pressure of -0.09MPa for vacuum immersion for 30 minutes. The above two steps are repeated 3 times each.

[0047] (3) Transfer the solution and sample to a high-pressure reactor and keep it at 220°C for 22 hours. After the reactor cools down naturally with the furnace, take out the sample and grind off the excess sealing agent on the surface to complete the sealing process of the inorganic sealing agent.

[0048] Comparative Example 2

[0049] The application of an organic sealing agent in pore sealing includes the following steps:

[0050] (1) First, mix 60g of deionized water and 35g of organosilicon-modified acrylic resin and stir until the solution is completely and uniformly mixed.

[0051] (2) The plasma-sprayed high-entropy alloy coating is pretreated by rust removal, sanding, cleaning and degreasing and drying. Then it is placed in the above mixed solution for ultrasonic treatment for 30 minutes. After taking it out, it is placed in a vacuum drying oven with a pressure of -0.09MPa for vacuum immersion for 30 minutes. The above two steps are repeated 3 times each.

[0052] (3) Take out the sample, put it in a vacuum drying oven and keep it warm for 3 hours. Take out the sample and polish it to remove the excess sealing agent on the surface to complete the sealing process of the organic sealing agent.

[0053] Comparative Example 3

[0054] The application of an organic-inorganic hybrid sealing agent in pore sealing includes the following steps:

[0055] (1) Add 1g of MoS2 precursor (sodium molybdate and thiourea molar ratio 1:3) to 60g of deionized water and stir until the solution is completely and uniformly mixed.

[0056] (2) Transfer the solution to a high-pressure reactor and keep it at 220°C for 22 hours. After the reactor cools down naturally with the furnace, take out the powder, dry and grind it to obtain black molybdenum disulfide powder, and pour it into a solution containing 60g of deionized water and 20g of organosilicon-modified acrylic resin. Stir until the solution is completely and evenly mixed.

[0057] (3) The plasma-sprayed high-entropy alloy coating is pretreated by rust removal, sanding, cleaning and degreasing and drying. Then it is placed in the above mixed solution for ultrasonic treatment for 30 minutes. After taking it out, it is placed in a vacuum drying oven with a pressure of -0.09MPa for vacuum immersion for 30 minutes. The above two steps are repeated 3 times each.

[0058] (4) Take out the sample, put it in a vacuum drying oven and keep it warm for 3 hours. Take out the sample and polish it to remove the excess sealing agent on the surface, thus completing the sealing process of the organic-inorganic hybrid sealing agent.

[0059] The sealing agent was used to seal the pores of the plasma-sprayed iron-based amorphous coating. The porosity of the coating before and after sealing was observed and analyzed using an optical microscope and a scanning electron microscope. The electrochemical properties of the coating were measured and analyzed using a Chenhua CHI660E electrochemical workstation (corrosion current in 3.5% NaCl solution). The tribological properties of the coating were tested using an MS-T3000 ball-disc rotary tribological tester. All tests were repeated three times, and the results were the average of the three experiments. Specific data are shown in Table 1.

[0060] Table 1 Comparison of corrosion performance and friction coefficient before and after sealing.

[0061]

[0062]

[0063] Comparing the data of Comparative Example 1 and Example 2, it can be seen that the average friction coefficient of the high-entropy alloy coating sealed with an inorganic sealing agent is similar to that of the high-entropy alloy coating sealed with an organic-inorganic hybrid sealing agent. However, the self-corrosion current density of the high-entropy alloy coating sealed with an inorganic sealing agent is 1.6 × 10⁻⁶. -4 A / cm 2 This is significantly greater than the self-corrosion current density of 1.1 × 10⁻⁶ for high-entropy alloy coatings sealed with organic-inorganic hybrid sealing agents. -6 A / cm 2 This indicates that the organic-inorganic hybrid sealing agent significantly improves the corrosion resistance of the coating while retaining the lubrication properties of the inorganic MoS2 sealing agent.

[0064] Comparing the data of Comparative Example 2 with those of Example 2, it can be seen that the self-corrosion current density and average friction coefficient of the high-entropy alloy coating sealed with the organic-inorganic hybrid sealing agent are better than those of the high-entropy alloy coating sealed with the organic sealing agent, indicating that the sealing effect of the organic-inorganic hybrid sealing agent is better.

[0065] The results show that, compared with Example 2, the wear resistance of the high-entropy alloy coating sealed with an inorganic sealing agent in Comparative Example 1 is similar to that of the high-entropy alloy coating sealed with an organic-inorganic hybrid sealing agent, but the corrosion resistance of the high-entropy alloy coating sealed with an inorganic sealing agent is worse. In Comparative Example 2, the wear resistance and corrosion resistance of the high-entropy alloy coating sealed with an organic sealing agent are slightly worse than those of the high-entropy alloy coating sealed with an organic-inorganic hybrid sealing agent. This indicates that combining organic corrosion-resistant sealing materials and inorganic lubricating phase materials to construct a novel, stable, and robust hybrid sealing material can effectively complement the properties of both, achieving superior performance not possessed by a single material. The sealing agent can effectively achieve the sealing treatment of plasma-sprayed coatings, realizing a comprehensive improvement in the coating's corrosion resistance and friction and wear resistance.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent, characterized in that, It is made from the following components by weight: 1 part MoS2 precursor, 20-50 parts waterborne organosilicon modified acrylic resin, 50-75 parts deionized water, and 0.5-1 part surfactant. The application of the wear-resistant and corrosion-resistant organic-inorganic hybrid sealing agent in sealing is characterized by the following steps: (1) First, mix deionized water and organosilicon-modified acrylic resin, stir evenly, then add MoS2 precursor and surfactant, and continue stirring until the solution is completely and evenly mixed. (2) Place the pretreated sprayed coating sample in the mixed solution obtained in step (1) and perform ultrasonic treatment and vacuum impregnation treatment in sequence, repeating each three times; (3) Transfer the solution and sample to a high-pressure reactor, keep it warm for reaction, and after the reactor cools down naturally with the furnace, take out the sample and grind off the excess sealing agent on the surface to complete the sealing process of the organic-inorganic hybrid sealing agent. The MoS2 precursor is prepared by mixing sodium molybdate and thiourea in a molar ratio of 1:2~5. In step (3), the reaction conditions are 200~240℃ for 18~24h.

2. The sealing agent according to claim 1, characterized in that, The surfactant is one or more of BYK-024 defoamer, BYK-156 dispersant, and BYK-346 wetting agent.

3. The sealing agent according to claim 1, characterized in that, It is made from the following components by weight: 1 part MoS2 precursor, 35 parts waterborne organosilicon modified acrylic resin, 60 parts deionized water, and 0.8 parts surfactant.

4. The sealing agent according to claim 1, characterized in that, In step (2), the surface pretreatment of the sprayed coating sample includes rust removal, sanding, cleaning and degreasing, and drying.

5. The sealing agent according to claim 1, characterized in that, In step (2), the ultrasound time is 20~40 min.

6. The sealing agent according to claim 1, characterized in that, In step (2), the vacuum impregnation pressure is -0.09MPa and the time is 20~50min.

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