A zinc-aluminum coating, a preparation method thereof, and a use method of the zinc-aluminum coating

Abstract

The application relates to the field of metal corrosion prevention technology, and discloses a zinc-aluminum coating preparation method, which comprises the following steps: S1, taking a first container, adding 5-10 parts of sulfonated beta-cyclodextrin water-based adhesive, 5-10 parts of n-propanol and 15-30 parts of deionized water into the first container in proportion; S2, pouring the mixture in the first container into a stirring equipment to uniformly stir and uniformly disperse to prepare an A-component mixture; S3, taking a second container, adding 15-25 parts of zinc-aluminum powder, 7-10 parts of an organic solvent, 10-25 parts of a dispersing agent and 23-35 parts of deionized water into the second container in proportion. The zinc-aluminum coating is not only beneficial to reducing the release of coating volatile matters and reducing the influence on the environment, but also makes the coating layer more environmentally friendly; in addition, the sintering temperature of the coating is relatively low, energy can be effectively saved, the energy utilization rate is relatively high in the production process, and the application conforms to the concept of sustainable development.

Description

Technical Field

[0001] The present invention relates to the technical field of metal anticorrosion, in particular to a zinc-aluminum coating and a preparation method thereof, and a method for using the zinc-aluminum coating. Background Art

[0002] Metal has good gloss and ductility, and can be widely used in various fields such as water conservancy and hydropower, transportation, chemical machinery and military facilities. However, metal materials often undergo chemical, electrochemical and other reactions due to inevitable contact with the surrounding environment during use, and eventually lose their function due to corrosion. Therefore, the hot-dip galvanizing process was invented. Compared with traditional painting, oiling and other processes, the anti-corrosion effect brought by the hot-dip galvanizing process can be extended by several times, and can effectively inhibit the development of local corrosion. With the continuous development of social economy and the further improvement of scientific and technological levels, more and more anti-corrosion technologies, such as electrogalvanizing, Dacromet, zinc-aluminum coating and other technologies, have been developed based on the hot-dip galvanizing process. Therefore, the hazards and damage caused by corrosion cannot be ignored. The use of certain protective technologies to prevent steel from corrosion is of great significance to people's production and life.

[0003] Dacromet is an aqueous inorganic mixed solution composed of flaky zinc, aluminum powder, chromate, deionized water and various additives. The Dacromet treatment solution is applied to the surface of the pre-treated workpiece by dipping, brushing or electrostatic spraying. The coating is obtained by drying at 80°C and curing and sintering at about 300°C. During the curing process, the water and organic components in the coating solution evaporate, and the Cr in the coating solution is 6+ It is reduced by an organic reducing agent to form an insoluble amorphous composite chromate compound nCrO3·mCr2O3, which acts as a binder to firmly adhere zinc and aluminum powder to the surface of the steel substrate, forming a dense protective layer. However, the Cr in the chromate used is 6+ It will have an impact on the environment and human body, and even cause cancer, so there are certain defects. Therefore, a zinc-aluminum coating and a preparation method and a method for using the zinc-aluminum coating are proposed to solve the above-mentioned problems. Summary of the Invention

[0004] (1) Technical problems solved

[0005] The purpose of the present invention is to reduce the impact of volatiles on the environment and effectively save energy. A zinc-aluminum coating, a preparation method thereof, and a method for using the zinc-aluminum coating are proposed.

[0006] (2) Technical solution

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A method for preparing a zinc-aluminum coating comprises the following steps:

[0009] S1. Take a first container and add 5 to 10 parts of sulfonated β-cyclodextrin aqueous adhesive, 5 to 10 parts of n-propanol and 15 to 30 parts of deionized water into the first container according to proportion;

[0010] S2. Pour the mixture in the first container into a stirring device and stir uniformly to uniformly disperse to form a mixture of component A;

[0011] S3, take a second container, add 15 to 25 parts of zinc aluminum powder, 7 to 10 parts of organic solvent, 10 to 25 parts of dispersant, and 23 to 35 parts of deionized water in the second container according to proportion;

[0012] S4, pouring the mixture in the second container into a stirring device and stirring uniformly to uniformly disperse to form a mixture of component B;

[0013] S5. Take a third container and add 0.5 to 1 part of thickener and lubricant into the third container in proportion to prepare a mixture of component C;

[0014] S6. Take a fourth container, add the mixture of component A and the mixture of component B into the fourth container in proportion, then pour into the stirring device and continue stirring;

[0015] S7. After uniformly stirring and dispersing in step S6, obtain a D component mixture, add the C component mixture into the D component mixture in proportion to prepare a zinc-aluminum coating.

[0016] On the basis of the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the stirring equipment in step S2, step S4 and step S6 is one of a stirrer, a reactor, a blender, a high shear emulsifier, a ball mill and a centrifugal mixer.

[0018] Furthermore, in step S3, the shape of the zinc-aluminum powder is one of flake and scale.

[0019] Furthermore, the organic solvent in step S3 is a mixture of one or more of ethylene glycol and n-butanol.

[0020] Furthermore, the dispersant in step S3 is a mixture of one or more organic solvents such as alcohols, ethers, esters, sodium dodecylbenzenesulfonate, composite nonionic surfactant, polyvinyl alcohol, polyacrylate, sodium carboxymethyl cellulose, and polyethylene glycol.

[0021] Furthermore, a defoaming agent is further added in step S7, wherein the defoaming agent is a liquid non-silicon defoaming agent.

[0022] A zinc-aluminum coating comprises the following raw material components: 5-10 parts of sulfonated β-cyclodextrin water-based adhesive, 5-10 parts of n-propanol and 15-30 parts of deionized water, 15-25 parts of zinc-aluminum powder, 7-10 parts of organic solvent, 10-25 parts of dispersant, 23-35 parts of deionized water; and 0.5-1 part of thickener, smoothing agent, etc.

[0023] A method for using zinc-aluminum coating comprises applying the coating on a corrosion-preventing substrate by dipping, adopting a two-coating and two-baking process, with a coating thickness of 6 to 20 μm, a drying temperature of 60 to 100° C., a drying time of 5 to 30 minutes, a sintering and curing temperature of 250 to 350° C., and a sintering and curing time of 20 to 50 minutes.

[0024] (3) Beneficial effects

[0025] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0026] A zinc-aluminum coating is a coating with special properties and advantages. Its uniqueness lies in the low organic content in its ingredients, which not only helps to reduce the release of volatiles in the coating and reduce the impact on the environment, but also makes the coating more environmentally friendly. In addition, the sintering temperature of this coating is low, which can effectively save energy and has a high energy utilization rate in the production process, which is in line with the concept of sustainable development. Compared with traditional coatings, this zinc-aluminum coating has excellent acid, alkali and salt resistance. It can effectively resist the erosion of various chemical corrosive substances, protect the substrate from corrosion and extend its service life. Its excellent corrosion resistance enables it to maintain the stability and protection of the coating even in harsh environments, providing long-term protection for the coated object. In general, this zinc-aluminum coating is not only environmentally friendly and energy-saving, but also has excellent corrosion resistance. It is suitable for various industrial fields and application scenarios, can provide effective protection for the coated object, extend its service life, and reduce maintenance costs. It is a high-performance coating product with broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a zinc-aluminum coating sample of the present invention;

[0028] Figure 2 This is a schematic diagram of the appearance of the sample after being soaked in salt water for 720 hours;

[0029] Figure 3 This is a test result diagram of samples of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Combine Figure 1-Figure 3 As shown, a method for preparing a zinc-aluminum coating of the present invention is characterized by comprising the following steps:

[0032] S1. Take a first container and add 5 to 10 parts of sulfonated β-cyclodextrin aqueous adhesive, 5 to 10 parts of n-propanol and 15 to 30 parts of deionized water into the first container according to proportion;

[0033] S2. Pour the mixture in the first container into a stirring device and stir uniformly to uniformly disperse the mixture into component A. The stirring device is one of a stirrer, a reactor, a blender, a high shear emulsifier, a ball mill, and a centrifugal mixer;

[0034] S3. Take a second container and add 15 to 25 parts of zinc-aluminum powder, 7 to 10 parts of an organic solvent, 10 to 25 parts of a dispersant, and 23 to 35 parts of deionized water in proportion to the second container, wherein the zinc-aluminum powder is in the shape of flakes or scales, the organic solvent is a mixture of one or more of ethylene glycol and n-butanol, and the dispersant is a mixture of one or more of an organic solvent such as an alcohol, an ether, an ester, sodium dodecylbenzene sulfonate, a composite nonionic surfactant, polyvinyl alcohol, polyacrylate, sodium carboxymethyl cellulose, and polyethylene glycol;

[0035] S4. Pour the mixture in the second container into a stirring device and stir uniformly to uniformly disperse the mixture into a B component mixture. The stirring device is one of a stirrer, a reactor, a blender, a high shear emulsifier, a ball mill, and a centrifugal mixer.

[0036] S5. Take a third container and add 0.5 to 1 part of thickener and lubricant into the third container in proportion to prepare a mixture of component C;

[0037] S6. Take a fourth container, add the mixture of component A and the mixture of component B into the fourth container in proportion, and then pour it into a stirring device and continue stirring. The stirring device is one of a stirrer, a reactor, a blender, a high shear emulsifier, a ball mill, and a centrifugal mixer;

[0038] S7. After stirring and dispersing uniformly in step S6, a D component mixture is obtained, and the C component mixture is added to the D component mixture in proportion to prepare a zinc-aluminum coating. A defoamer is also added, wherein the defoamer is a liquid non-silicon defoamer.

[0039] A zinc-aluminum coating comprises the following raw material components: 5-10 parts of sulfonated β-cyclodextrin water-based adhesive, 5-10 parts of n-propanol and 15-30 parts of deionized water, 15-25 parts of zinc-aluminum powder, 7-10 parts of organic solvent, 10-25 parts of dispersant, 23-35 parts of deionized water; and 0.5-1 part of thickener, smoothing agent, etc.

[0040] A method for using zinc-aluminum coating comprises applying the coating on a corrosion-preventing substrate by dipping, adopting a two-coating and two-baking process, with a coating thickness of 6 to 20 μm, a drying temperature of 60 to 100° C., a drying time of 5 to 30 minutes, a sintering and curing temperature of 250 to 350° C., and a sintering and curing time of 20 to 50 minutes.

[0041] Example 1

[0042] Weigh 5 parts of sulfonated β-cyclodextrin aqueous adhesive, 5 parts of n-propanol and 15 parts of deionized water, stir magnetically at a constant temperature of 30° C. for 12 hours, and evenly disperse them to form component A for later use.

[0043] Weigh 6 parts of zinc powder, 9 parts of aluminum powder, and 7 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 10 parts of Tween-20 and 25 parts of deionized water and mechanically stir for 30 minutes to disperse evenly to prepare component B for standby use.

[0044] Weigh 8 parts of component A and 30 parts of component B, stir and disperse them evenly, then add 1 part of thickener and 1 part of smoothing agent of component C and stir for 4 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0045] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 65°C for 20 minutes, the temperature was raised to 255°C and sintered and cured for 25 minutes. The coating thickness was about 11μm.

[0046] Example 2

[0047] Weigh 6 parts of sulfonated β-cyclodextrin aqueous adhesive, 6 parts of n-propanol and 18 parts of deionized water, stir magnetically at a constant temperature of 35° C. for 12 hours, and evenly disperse them to form component A for later use.

[0048] Weigh 8 parts of zinc powder, 10 parts of aluminum powder, and 8 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 15 parts of Tween-20 and 28 parts of deionized water and mechanically stir for 35 minutes to disperse evenly to prepare component B for standby use.

[0049] Weigh 12 parts of component A and 35 parts of component B, stir and disperse them evenly, then add 1 part of component C thickener and 1 part of smoothing agent and stir for 5 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0050] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 90°C for 15 minutes, the temperature was raised to 269°C and sintered and cured for 30 minutes. The coating thickness was about 8μm.

[0051] Example 3

[0052] Weigh 8 parts of sulfonated β-cyclodextrin aqueous adhesive, 8 parts of n-propanol and 24 parts of deionized water, stir magnetically at a constant temperature of 30° C. for 12 hours, and evenly disperse them to form component A for later use.

[0053] Weigh 7 parts of zinc powder, 13 parts of aluminum powder, and 7 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 20 parts of Tween-20 and 28 parts of deionized water and mechanically stir for 35 minutes to disperse evenly to prepare component B for standby use.

[0054] Weigh 10 parts of component A and 32 parts of component B, stir and disperse them evenly, then add 1 part of component C thickener and 1 part of smoothing agent and stir for 4 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0055] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 75°C for 25 minutes, the temperature was raised to 280°C and sintered and cured for 20 minutes. The coating thickness was about 19μm.

[0056] Example 4

[0057] Weigh 10 parts of sulfonated β-cyclodextrin aqueous adhesive, 10 parts of n-propanol and 30 parts of deionized water, stir magnetically at a constant temperature of 32° C. for 11 hours, and evenly disperse them to form component A for later use.

[0058] Weigh 11 parts of zinc powder, 12 parts of aluminum powder, and 11 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 25 parts of Tween-20 and 35 parts of deionized water and mechanically stir for 45 minutes to disperse evenly to prepare component B for standby use.

[0059] Weigh 15 parts of component A and 28 parts of component B, stir and disperse them evenly, then add 1 part of component C thickener and 1 part of smoothing agent and stir for 4 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0060] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 90°C for 10 minutes, the temperature was raised to 295°C and sintered and cured for 40 minutes. The coating thickness was about 17μm.

[0061] Example 5

[0062] Weigh 5 parts of sulfonated β-cyclodextrin aqueous adhesive, 5 parts of n-propanol and 15 parts of deionized water, stir magnetically at a constant temperature of 30° C. for 12 hours, and evenly disperse them to form component A for later use.

[0063] Weigh 10 parts of zinc powder, 17 parts of aluminum powder, and 10 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 10 parts of Tween-20 and 25 parts of deionized water and mechanically stir for 30 minutes to disperse evenly to prepare component B for standby use.

[0064] Weigh 14 parts of component A and 26 parts of component B, stir and disperse them evenly, then add 1 part of thickener and 1 part of smoothing agent of component C and stir for 4 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0065] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 98°C for 28 minutes, the temperature was raised to 260°C and sintered and cured for 36 minutes, and the coating thickness was about 16μm.

[0066] Example 6

[0067] Weigh 7 parts of sulfonated β-cyclodextrin aqueous adhesive, 7 parts of n-propanol and 21 parts of deionized water, stir magnetically at a constant temperature of 33° C. for 14 hours, and evenly disperse them to form component A for later use.

[0068] Weigh 15 parts of zinc powder, 8 parts of aluminum powder, and 15 parts of ethylene glycol, mix and stir for 30 minutes to disperse evenly, then add 25 parts of Tween-20 and 35 parts of deionized water and mechanically stir for 26 minutes to disperse evenly to prepare component B for standby use.

[0069] Weigh 13 parts of component A and 41 parts of component B, stir and disperse them evenly, then add 1 part of component C thickener and 1 part of smoothing agent and stir for 5 hours to obtain a new sulfonated β-cyclodextrin water-based adhesive zinc-aluminum coating.

[0070] The Q235 substrate was coated by dip coating, and a two-coating and two-baking process was adopted. After drying at 81°C for 8 minutes, the temperature was raised to 320°C and sintered and cured for 21 minutes. The coating thickness was about 13μm.

[0071] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a zinc-aluminum coating, characterized in that: The following steps are involved: S1. Take a first container and add 5 to 10 parts of sulfonated β-cyclodextrin aqueous adhesive, 5 to 10 parts of n-propanol and 15 to 30 parts of deionized water into the first container according to proportion; S2. Pour the mixture in the first container into a stirring device and stir uniformly to uniformly disperse to form a mixture of component A; S3, take a second container, add 15 to 25 parts of zinc aluminum powder, 7 to 10 parts of organic solvent, 10 to 25 parts of dispersant, and 23 to 35 parts of deionized water into the second container according to proportion; S4, pouring the mixture in the second container into a stirring device and stirring uniformly to uniformly disperse to form a mixture of component B; S5. Take a third container and add 1 part of thickener and 1 part of smoothing agent in proportion to the third container to prepare a mixture of component C; S6. Take a fourth container, add the mixture of component A and the mixture of component B into the fourth container in proportion, then pour into the stirring device and continue stirring; S7. After uniformly stirring and dispersing in step S6, obtain a D component mixture, add the C component mixture into the D component mixture in proportion to prepare a zinc-aluminum coating.

2. The method for preparing a zinc-aluminum coating according to claim 1, wherein: The stirring equipment in step S2, step S4 and step S6 is one of a stirrer, a reactor and a ball mill.

3. The method for preparing a zinc-aluminum coating according to claim 1, wherein: In step S3, the zinc-aluminum powder is in a shape of flake or scale.

4. The method for preparing a zinc-aluminum coating according to claim 1, wherein: In step S3, the organic solvent is a mixture of one or more of ethylene glycol and n-butanol.

5. The method for preparing a zinc-aluminum coating according to claim 1, wherein: The dispersant in step S3 is a mixture of one or more of an organic solvent of alcohols, ethers, and esters, sodium dodecylbenzene sulfonate, polyvinyl alcohol, polyacrylate, sodium carboxymethyl cellulose, and polyethylene glycol.

6. The method for preparing a zinc-aluminum coating according to claim 1, wherein: In step S7, a defoaming agent is further added, wherein the defoaming agent is a liquid non-silicon defoaming agent.

7. A zinc-aluminum coating prepared by the method for preparing a zinc-aluminum coating according to any one of claims 1 to 6, characterized in that: According to the mass percentage, the raw material components include: 5-10 parts of sulfonated β-cyclodextrin aqueous adhesive, 5-10 parts of n-propanol and 15-30 parts of deionized water, 15-25 parts of zinc aluminum powder, 7-10 parts of organic solvent, 10-25 parts of dispersant, 23-35 parts of deionized water, 1 part of thickener and 1 part of smoothing agent.

8. A method for using the zinc-aluminum coating according to claim 7, characterized in that: The anti-corrosion substrate is coated by dipping, and a two-coating and two-baking process is adopted. The coating thickness is 6 to 20 μm, the drying temperature is 60 to 100° C., the drying time is 5 to 30 minutes, the sintering and curing temperature is 250 to 350° C., and the sintering and curing time is 20 to 50 minutes.

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