A geopolymer zinc-rich anticorrosive coating, and a preparation method and use method thereof

Abstract

The application provides a geopolymer zinc-rich anticorrosive coating and a preparation method and use method thereof. The geopolymer zinc-rich anticorrosive coating comprises slag, metakaolin, water glass, zinc powder, a filler and an additive. The application solves the problem of poor mechanical properties caused by excessive zinc powder content. The problem of poor protection of the coating caused by excessive zinc powder content can be effectively avoided by high-temperature (450-500 DEG C) baking of the geopolymer zinc-rich anticorrosive coating. The molten zinc powder can completely fill the pores between the coating and the zinc powder and form a dense passivation film. Compared with the traditional zinc-rich coating, the high-temperature baked zinc-rich anticorrosive coating has higher hardness, wear resistance, corrosion resistance and heat resistance.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a geopolymer zinc-rich anti-corrosion coating and its preparation and application methods. Background Technology

[0002] Surface anti-corrosion coatings are widely used in fields with stringent requirements for high strength, corrosion resistance, and high temperature resistance. They are mainly divided into organic coatings and inorganic coatings. Currently, the most common combination of zinc powder and anti-corrosion coatings used on concrete surfaces, metal surfaces, and marine surfaces is zinc powder. Zinc powder is the main filler in anti-corrosion coatings, and its main function is to provide electrochemical protection to the coating while also having a physical shielding effect, which significantly improves the corrosion resistance of the coating.

[0003] Organic coatings are widely used in various fields due to their good density and excellent initial protective capabilities. However, organic materials have drawbacks such as serious environmental pollution, resource waste, easy aging, and poor weather resistance, affecting the service life of the coating. Furthermore, organic coatings also suffer from high emissions of volatile organic compounds and carbon dioxide during production and use, and are easily damaged during transportation. In contrast, inorganic coatings offer advantages such as high durability, good weather resistance, good breathability, less aging, high bonding strength, and excellent compatibility with substrates. They can form a gel, thus gaining increasing attention and practical applications. However, some defects in inorganic coatings remain unresolved. For example, their storage time is greatly affected by external environmental factors such as temperature and humidity; their post-film performance is also poor, with cracking and peeling occurring after curing due to various reasons. Among inorganic zinc-rich coatings, zinc aluminosilicate coatings are widely used. They provide excellent corrosion resistance to metal surfaces and also act as a binder in coatings. However, excessive zinc powder content in inorganic zinc-rich coatings can lead to poor mechanical properties.

[0004] Given the current problem of poor mechanical properties caused by excessive zinc powder content in inorganic zinc-rich coatings, it is necessary to improve this. Summary of the Invention

[0005] In view of this, the present invention provides a geopolymer zinc-rich anti-corrosion coating and its preparation and application methods to solve or at least partially solve the defects existing in the prior art.

[0006] In a first aspect, the present invention provides a geopolymer zinc-rich anti-corrosion coating, comprising powder and water, wherein the powder comprises the following raw materials in parts by weight: 7-11 parts slag, 0.5-2 parts metakaolin, 2-5 parts water glass, 14.25-16.15 parts zinc powder, 3-9 parts filler, and 0.3-0.9 parts additives.

[0007] Preferably, in the aforementioned zinc-rich geopolymer anti-corrosion coating, the filler is quartz sand.

[0008] Preferably, in the aforementioned geopolymer zinc-rich anti-corrosion coating, the additives include a mixture of sodium carboxymethyl starch and hydroxypropyl methylcellulose.

[0009] Preferably, in the geopolymer zinc-rich anti-corrosion coating, the mass ratio of sodium carboxymethyl starch and hydroxypropyl methylcellulose is (1-3):(1-3).

[0010] Preferably, in the aforementioned zinc-rich geopolymer anti-corrosion coating, the quartz sand has a particle size of 600-1000 mesh.

[0011] Preferably, in the aforementioned zinc-rich geopolymer anticorrosive coating, the water glass comprises sodium silicate water glass and / or potassium silicate water glass;

[0012] The sodium silicate water glass has a modulus of 2.1 to 2.6.

[0013] The potassium silicate water glass has a modulus of 3.0 to 3.4.

[0014] Preferably, in the geopolymer zinc-rich anti-corrosion coating, the mass ratio of powder to water is (0.4-0.5):1.

[0015] Secondly, the present invention also provides a method for preparing the aforementioned geopolymer zinc-rich anti-corrosion coating, comprising the following steps:

[0016] After mixing slag, metakaolin, water glass, zinc powder, filler, additives and water, the mixture is stirred to obtain a geopolymer zinc-rich anti-corrosion coating.

[0017] Thirdly, the present invention also provides a method for using the aforementioned zinc-rich geopolymer anticorrosive coating or the zinc-rich geopolymer anticorrosive coating prepared by the aforementioned preparation method, comprising the following steps:

[0018] The zinc-rich geopolymer anti-corrosion coating is applied to the substrate, cured, and baked at 450-500℃ for 5-20 seconds.

[0019] Preferably, the method of using the aforementioned zinc-rich geopolymer anti-corrosion coating involves applying the coating to a substrate, curing it at a temperature of 21–25°C and a relative humidity of 45–55% for 6–8 days, and then baking it at 450–500°C for 5–20 seconds.

[0020] The geopolymer zinc-rich anti-corrosion coating of the present invention, its preparation method, and its application method have the following advantages over the prior art:

[0021] The present invention relates to a polymer-rich zinc anti-corrosion coating comprising slag, metakaolin, water glass, zinc powder, filler, and additives. This invention solves the problem of poor mechanical properties caused by excessive zinc powder content. By baking the polymer-rich zinc anti-corrosion coating at high temperature (450–500°C), the problem of reduced protective properties due to excessive zinc powder content can be effectively avoided. This allows the molten zinc powder to completely fill the pores between the coating and the zinc powder, forming a dense passivation film. Compared with traditional zinc-rich coatings, the high-temperature baked zinc-rich anti-corrosion coating exhibits higher hardness, wear resistance, and corrosion resistance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The images show the appearance of samples A1, A2, and A3 from Examples 1-3 after being baked at high temperature and then subjected to accelerated corrosion in seawater for 7 days.

[0024] Figure 2 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not baked at high temperature after being accelerated corroded in seawater for 7 days.

[0025] Figure 3 The images show the appearance of samples A1, A2, and A3 from Examples 1-3 after being baked at high temperature and then subjected to accelerated corrosion in seawater for 14 days.

[0026] Figure 4 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not baked at high temperature after being accelerated corroded in seawater for 14 days.

[0027] Figure 5 The images show the appearance of samples A1, A2, and A3 from Examples 1-3 after being baked at high temperature and then subjected to accelerated corrosion in seawater for 28 days.

[0028] Figure 6 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not subjected to high-temperature baking after 28 days of accelerated corrosion in seawater. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single digits within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0031] This application provides a geopolymer zinc-rich anti-corrosion coating, comprising powder and water. The powder comprises the following raw materials in parts by weight: 7-11 parts slag, 0.5-2 parts metakaolin, 2-5 parts water glass, 14.25-16.15 parts zinc powder, 3-9 parts filler, and 0.3-0.9 parts additives.

[0032] Specifically, the slag in this application is blast furnace slag, which is a type of waste residue discharged from the blast furnace during pig iron smelting.

[0033] In some embodiments, the filler is quartz sand.

[0034] In some embodiments, the adjuvants include a mixture of sodium carboxymethyl starch (CMS) and hydroxypropyl methylcellulose (HPMC).

[0035] In some embodiments, the mass ratio of sodium carboxymethyl starch (CMS) to hydroxypropyl methylcellulose (HPMC) is (1-3):(1-3).

[0036] In some embodiments, the particle size of the quartz sand is 600 to 1000 mesh.

[0037] In some embodiments, water glass includes sodium silicate water glass and / or potassium silicate water glass;

[0038] The modulus of sodium silicate water glass is 2.1 to 2.6.

[0039] The modulus of potassium silicate water glass is 3.0 to 3.4.

[0040] In some embodiments, the mass ratio of powder to water is (0.4 to 0.5):1.

[0041] Specifically, in the above embodiments, slag, metakaolin, water glass, and quartz sand are combined to form a geopolymer.

[0042] Based on the same inventive concept, the present invention also provides a method for preparing the above-mentioned geopolymer zinc-rich anti-corrosion coating, comprising the following steps:

[0043] After mixing slag, metakaolin, water glass, zinc powder, filler, additives and water, the mixture is stirred to obtain a geopolymer zinc-rich anti-corrosion coating.

[0044] In some embodiments, slag, metakaolin, water glass, filler, zinc powder and additives are mixed in the above weight proportions, and water is added in the above mass proportions. The mixture is stirred for 5 minutes at 800-1200 r / min using a disperser at room temperature (21-25°C) to obtain a geopolymer zinc-rich anti-corrosion coating.

[0045] Based on the same inventive concept, the present invention also provides a method for using the above-mentioned zinc-rich geopolymer anticorrosive coating or the zinc-rich geopolymer anticorrosive coating prepared by the above-described preparation method, comprising the following steps:

[0046] Apply the zinc-rich geopolymer anti-corrosion coating to the substrate, cure it, and bake it at 450-500℃ for 5-20 seconds.

[0047] In some embodiments, the above-mentioned geopolymer zinc-rich anti-corrosion coating is applied to the substrate, cured at a temperature of 21-25°C and a relative humidity of 45-55% for 6-8 days, and then baked at 450-500°C for 5-20 seconds.

[0048] Specifically, the coating method is scraping or spraying; for example, the polymer-rich zinc anti-corrosion coating is applied by scraping onto a 50mm×30mm×1mm (i.e., 50mm in length, 30mm in width, and 1mm in height) Q235 low carbon steel sheet; or, the polymer-rich zinc anti-corrosion coating is applied by spraying onto a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate.

[0049] The principle behind the use of the geopolymer zinc-rich anti-corrosion coating for metal protection in this invention is as follows: it provides electrochemical protection for the coating. The zinc powder acts as a sacrificial anode in the coating to provide electrochemical protection for the metal substrate. After being corroded by the external environment, the corroded zinc powder forms a dense film on the surface of the metal substrate, which plays a role in physical shielding.

[0050] This invention solves the problem of poor mechanical properties caused by excessive zinc powder content. By baking the polymer zinc-rich anti-corrosion coating at high temperature (450-500℃), the problem of poor protective properties of the coating due to excessive zinc powder content can be effectively avoided. This allows the molten zinc powder to completely fill the pores between the coating and the zinc powder and form a dense passivation film. Compared with traditional zinc-rich coatings, the zinc-rich anti-corrosion coating baked at high temperature has higher hardness, wear resistance, corrosion resistance and heat resistance.

[0051] The following specific embodiments further illustrate the geopolymer zinc-rich anti-corrosion coating of the present invention, its preparation method, and its application method. This section further illustrates the content of the present invention in conjunction with specific embodiments, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the art.

[0052] Example 1

[0053] This application provides a geopolymer zinc-rich anti-corrosion coating, which, by weight, is composed of the following raw materials: 14.42 parts water, 1 part metakaolin, 3 parts water glass, 14.25 parts zinc powder, 9 parts slag, 6 parts filler, and 0.6 parts additives.

[0054] Among them, the slag is blast furnace slag;

[0055] The water glass is potassium silicate water glass with a modulus of 3.2;

[0056] The filler is quartz sand with a mesh size of 800.

[0057] The additives include a mixture of sodium carboxymethyl starch (CMS) and hydroxypropyl methylcellulose (HPMC) in a mass ratio of 1:1.

[0058] The preparation method of the above-mentioned zinc-rich geopolymer anti-corrosion coating includes the following steps:

[0059] Slag, metakaolin, water glass, filler, zinc powder and additives are mixed in the above weight proportions, and water is added in the above mass ratio. The mixture is stirred in a disperser at 1000 r / min for 5 min to obtain a geopolymer zinc-rich anti-corrosion coating.

[0060] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0061] Take 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 1 and apply it to a 50mm×30mm×1mm (i.e., length 50mm, width 30mm, height 1mm) Q235 low carbon steel sheet by scraping. Cure it at 25℃ and 50% relative humidity for 7 days, and then bake it at 450℃ for 10s. The resulting sample is recorded as A1.

[0062] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0063] 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 1 was applied to a 50mm×30mm×1mm (i.e., 50mm in length, 30mm in width, and 1mm in height) Q235 low-carbon steel sheet by scraping. The sheet was cured for 7 days at a temperature of 25℃ and a relative humidity of 50%. The resulting sample was designated as B1.

[0064] Example 2

[0065] This application provides a geopolymer zinc-rich anti-corrosion coating, which is composed of the following raw materials by mass percentage: 14.8 parts water, 1 part metakaolin, 3 parts water glass, 15.2 parts zinc powder, 9 parts slag, 6 parts filler, and 0.6 parts additives.

[0066] Among them, the slag is blast furnace slag;

[0067] The water glass is potassium silicate water glass with a modulus of 3.2;

[0068] The filler is quartz sand with a mesh size of 800.

[0069] The additives include a mixture of sodium carboxymethyl starch (CMS) and hydroxypropyl methylcellulose (HPMC) in a mass ratio of 1:1.

[0070] The preparation method of the above-mentioned zinc-rich geopolymer anti-corrosion coating includes the following steps:

[0071] Slag, metakaolin, water glass, filler, zinc powder and additives are mixed in the above weight proportions, and water is added in the above mass ratio. The mixture is stirred in a disperser at 1000 r / min for 5 min to obtain a geopolymer zinc-rich anti-corrosion coating.

[0072] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0073] Take 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 2 and apply it to a 50mm×30mm×1mm (i.e., length 50mm, width 30mm, height 1mm) Q235 low carbon steel sheet by scraping. Cure it at 25℃ and 50% relative humidity for 7 days, and then bake it at 470℃ for 10s. The resulting sample is recorded as A2.

[0074] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0075] Take 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 2 and apply it to a 50mm×30mm×1mm (i.e., length 50mm, width 30mm, height 1mm) Q235 low carbon steel sheet by scraping. Cure it at a temperature of 25℃ and a relative humidity of 50% for 7 days. The resulting sample is recorded as B2.

[0076] Example 3

[0077] This application provides a geopolymer zinc-rich anti-corrosion coating, which, by weight, is composed of the following raw materials: 15.22 parts water, 1 part metakaolin, 3 parts water glass, 16.15 parts zinc powder, 9 parts slag, 6 parts filler, and 0.6 parts additives.

[0078] Among them, the slag is blast furnace slag;

[0079] The water glass is potassium silicate water glass with a modulus of 3.2;

[0080] The filler is quartz sand with a mesh size of 800.

[0081] The additives include a mixture of sodium carboxymethyl starch (CMS) and hydroxypropyl methylcellulose (HPMC) in a mass ratio of 1:1.

[0082] The preparation method of the above-mentioned zinc-rich geopolymer anti-corrosion coating includes the following steps:

[0083] Slag, metakaolin, water glass, filler, zinc powder and additives are mixed in the above weight proportions, and water is added in the above mass ratio. The mixture is stirred in a disperser at 1000 r / min for 5 min to obtain a geopolymer zinc-rich anti-corrosion coating.

[0084] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0085] Take 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 3 and apply it to a 50mm×30mm×1mm (i.e., length 50mm, width 30mm, height 1mm) Q235 low carbon steel sheet by scraping. Cure it at 25℃ and 50% relative humidity for 7 days, and then bake it at 500℃ for 10s. The resulting sample is recorded as A3.

[0086] This embodiment also provides a method for using the above-mentioned polymer-rich zinc anti-corrosion coating, including the following steps:

[0087] 1.5g of the geopolymer zinc-rich anti-corrosion coating from Example 3 was applied to a 50mm×30mm×1mm (i.e., length 50mm, width 30mm, height 1mm) Q235 low carbon steel sheet by scraping. The sheet was cured for 7 days at a temperature of 25℃ and a relative humidity of 50%. The resulting sample was designated as B3.

[0088] Example 4

[0089] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 1, including the following steps:

[0090] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0091] The zinc-rich geopolymer anti-corrosion coating from Example 1 was applied to a cast iron plate by spraying and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 450°C for 10 seconds. The coating thicknesses were 100 μm, 150 μm, and 200 μm, respectively. The hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0092] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 1, including the following steps:

[0093] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0094] The zinc-rich geopolymer anti-corrosion coating from Example 1 was applied to a cast iron plate by spraying and cured for 7 days at 25°C and 50% relative humidity. The coating thicknesses were 100μm, 150μm, and 200μm, and the hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0095] Example 5

[0096] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 2, including the following steps:

[0097] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0098] The zinc-rich geopolymer anti-corrosion coating from Example 2 was applied to a cast iron plate by spraying and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 470°C for 10 seconds. The coating thicknesses were 100μm, 150μm, and 200μm, and the hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0099] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 2, including the following steps:

[0100] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0101] The zinc-rich geopolymer anti-corrosion coating from Example 2 was applied to a cast iron plate by spraying and cured for 7 days at 25°C and 50% relative humidity. The coating thicknesses were 100μm, 150μm, and 200μm, and the hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0102] Example 6

[0103] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 3, including the following steps:

[0104] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0105] The zinc-rich geopolymer anti-corrosion coating from Example 3 was applied to a cast iron plate by spraying and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 500°C for 10 seconds. The coating thicknesses were 100μm, 150μm, and 200μm, and the hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0106] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 3, including the following steps:

[0107] Grind a 150mm×70mm×8mm (i.e., 150mm in length, 70mm in width, and 8mm in height) cast iron plate with 200-grit sandpaper, and then clean it with deionized water and anhydrous ethanol.

[0108] The zinc-rich geopolymer anti-corrosion coating from Example 3 was applied to a cast iron plate by spraying and cured for 7 days at a temperature of 25°C and a relative humidity of 50%. The coating thicknesses were 100 μm, 150 μm, and 200 μm, and the hardness values ​​of the samples at different thicknesses were tested (each sample was measured 5 times at different locations using a Vickers hardness tester, and the average value was taken as the hardness data).

[0109] Example 7

[0110] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 1, including the following steps:

[0111] A tinplate sheet measuring 120mm × 50mm × 0.3mm (i.e., 120mm in length, 50mm in width, and 0.3mm in height) is sanded with 200-grit sandpaper and then cleaned with deionized water and anhydrous ethanol.

[0112] The zinc-rich geopolymer anti-corrosion coating from Example 1 was sprayed onto a tinplate sheet and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 500°C for 10 seconds (with un-dried coating used as a comparison for abrasion resistance); the coating thickness was controlled at 100 μm to test the abrasion resistance of the coating.

[0113] Place the coated sample flat on the test bench and bring its coated surface into contact with 100-grit sandpaper. Place a ruler next to the sandpaper and place a 200g weight on top of the sandpaper. Under the action of a 200g vertical external force, manually push the sandpaper 10cm. Define this process as one cycle. Repeat 100 times and record the surface wear. Take the average value of 3 sets of parallel experiments to calculate the average mass loss of the coating.

[0114] Example 8

[0115] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 2, including the following steps:

[0116] The zinc-rich geopolymer anti-corrosion coating from Example 2 was sprayed onto a tinplate sheet and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 500°C for 10 seconds (with un-dried coating used as a comparison for abrasion resistance). The coating thickness was controlled at 100 μm to test the abrasion resistance of the coating.

[0117] Place the coated sample flat on the test bench and bring its coated surface into contact with 100-grit sandpaper. Place a ruler next to the sandpaper and place a 200g weight on top of the sandpaper. Under the action of a 200g vertical external force, manually push the sandpaper 10cm. Define this process as one cycle. Repeat 100 times and record the surface wear. Take the average value of 3 sets of parallel experiments to calculate the average mass loss of the coating.

[0118] Example 9

[0119] This embodiment provides a method for using the geopolymer zinc-rich anti-corrosion coating in Example 3, including the following steps:

[0120] The zinc-rich geopolymer anti-corrosion coating from Example 3 was sprayed onto a tinplate sheet and cured for 7 days at 25°C and 50% relative humidity, followed by baking at 500°C for 10 seconds (with un-dried coating used as a comparison for abrasion resistance); the coating thickness was controlled at 100 μm to test the abrasion resistance of the coating.

[0121] Place the coated sample flat on the test bench and bring its coated surface into contact with 100-grit sandpaper. Place a ruler next to the sandpaper and place a 200g weight on top of the sandpaper. Under the action of a 200g vertical external force, manually push the sandpaper 10cm. Define this process as one cycle. Repeat 100 times and record the surface wear. Take the average value of 3 sets of parallel experiments to calculate the average mass loss of the coating.

[0122] Performance testing

[0123] Figure 1 The images show the appearance of samples A1, A2, and A3, which were baked at high temperature in Examples 1-3, after being accelerated corroded in seawater for 7 days.

[0124] Figure 2 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not subjected to high-temperature baking after being subjected to accelerated corrosion in seawater for 7 days.

[0125] Figure 3 The images show the appearance of samples A1, A2, and A3, which were baked at high temperature in Examples 1-3, after being accelerated corroded in seawater for 14 days.

[0126] Figure 4 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not subjected to high-temperature baking after 14 days of accelerated corrosion in seawater.

[0127] Figure 5 The images show the appearance of samples A1, A2, and A3, which were baked at high temperature in Examples 1-3, after being accelerated corroded in seawater for 28 days.

[0128] Figure 6 The images show the appearance of samples B1, B2, and B3 from Examples 1-3 that were not subjected to high-temperature baking after 28 days of accelerated corrosion in seawater.

[0129] From the above Figures 1-6 The comparison shows that the results at 7 days and 14 days are similar: obvious rust spots appeared on the surface of B1; rust traces appeared on the surface of B2, but the traces were relatively light; no corrosion traces were found on A1, A2, and A3. After 28 days, corrosion appeared in all groups B, and the edges of A1 were also affected by corrosion. These phenomena indicate that increasing the zinc powder content and high-temperature baking can improve the corrosion resistance of the coating.

[0130] The hardness values ​​of samples coated with different thicknesses in Examples 4-6 were tested under both dried and undried conditions. The results are shown in Table 1 below.

[0131] Table 1 - Hardness values ​​of different samples

[0132]

[0133]

[0134] As shown in Table 1 above, among all the unbaked samples in Examples 4-6, the highest hardness reached 88.82 HV, approximately 871.16 MPa. This indicates that increasing the zinc powder content and coating thickness significantly improves the hardness of the zinc-rich geopolymer coating. Furthermore, the samples baked at high temperatures achieved a maximum hardness of 93.57 HV, approximately 917.6 MPa. This demonstrates that samples baked at 450℃–500℃ exhibit even higher hardness.

[0135] Abrasion resistance tests (assessment of mass loss / g) were conducted on samples coated with different thicknesses according to the methods in Examples 7-9, both under dried and undried conditions. The results are shown in Table 2 below.

[0136] Table 2 - Abrasion Resistance Test

[0137]

[0138] As can be seen from the relevant data in Table 2, the difference in mass loss between baked and unbaked samples of the same embodiment is small, and the most significant factor is the amount of zinc powder added.

[0139] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for applying a geopolymer zinc-rich anti-corrosion coating, characterized in that, Includes the following steps: Apply the zinc-rich geopolymer anti-corrosion coating to the substrate, cure it, and bake it at 450~500℃ for 5~20s; The geopolymer zinc-rich anti-corrosion coating comprises powder and water. The powder comprises the following raw materials in parts by weight: 7-11 parts slag, 0.5-2 parts metakaolin, 2-5 parts water glass, 14.25-16.15 parts zinc powder, 3-9 parts filler, and 0.3-0.9 parts additives.

2. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 1, characterized in that, The zinc-rich geopolymer anti-corrosion coating is applied to the substrate and cured at a temperature of 21-25°C and a relative humidity of 45-55% for 6-8 days, and then baked at 450-500°C for 5-20 seconds.

3. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 1, characterized in that, The filler is quartz sand.

4. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 1, characterized in that, The additives include a mixture of sodium carboxymethyl starch and hydroxypropyl methylcellulose.

5. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 4, characterized in that, The mass ratio of sodium carboxymethyl starch to hydroxypropyl methylcellulose is (1~3):(1~3).

6. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 3, characterized in that, The particle size of the quartz sand is 600~1000 mesh.

7. The method of using the geopolymer zinc-rich anti-corrosion coating as described in claim 1, characterized in that, The water glass includes sodium silicate water glass and / or potassium silicate water glass; The sodium silicate water glass has a modulus of 2.1 to 2.

6. The potassium silicate water glass has a modulus of 3.0 to 3.

4.

8. The method of using the geopolymer zinc-rich anti-corrosion coating as described in any one of claims 1 to 7, characterized in that, The mass ratio of the powder to water is (0.4~0.5):

1.

9. The method of using the geopolymer zinc-rich anti-corrosion coating as described in any one of claims 1 to 7, characterized in that, Includes the following steps: After mixing slag, metakaolin, water glass, zinc powder, filler, additives and water, the mixture is stirred to obtain a geopolymer zinc-rich anti-corrosion coating.

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