CN111363459A - Zinc-aluminum coating and preparation method and application thereof - Google Patents
Zinc-aluminum coating and preparation method and application thereof Download PDFInfo
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- CN111363459A CN111363459A CN202010296908.7A CN202010296908A CN111363459A CN 111363459 A CN111363459 A CN 111363459A CN 202010296908 A CN202010296908 A CN 202010296908A CN 111363459 A CN111363459 A CN 111363459A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
- C09D171/02—Polyalkylene oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/22—Luminous paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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Abstract
The invention belongs to the technical field of coatings. The invention provides a zinc-aluminum coating, which enhances the corrosion resistance of a paint film on the basis of improving the hardness and the friction coefficient of the paint film through the matching of all components, can well identify a coating missing part and an uneven part due to the addition of fluorescent substances, can carry out coating adjustment in time, and reduces the possibility of corrosion. The invention also provides a preparation method of the coating, the coating can be obtained by simply stirring and heating in the preparation process, the operation is simple, the process requirement is low, and the production cost is saved. The invention also provides application of the coating in corrosion prevention of metal devices, and the coating can effectively protect the metal devices.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a zinc-aluminum coating and a preparation method and application thereof.
Background
The zinc-aluminum coating adopts the coating consisting of flaky zinc powder, flaky aluminum powder and an organic carrier to spray the metal surface, so the process cost is low, and the cathode protection effect is realized on the substrate. The zinc-aluminum coating and the modified epoxy resin form a comprehensive shielding effect, so that the permeation path of gas and liquid is blocked and prolonged, and good shielding protection is provided for a base material. But different raw materials and the fineness matching among the raw materials can influence the quality and the performance of the coating. In the coating process, the coating obtained due to operation reasons has different uniformity and cannot be found in time, a uniform and compact coating film cannot be formed, and the comprehensive properties of the coating, such as corrosion resistance, hardness and the like, are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a zinc-aluminum coating which is applied to corrosion prevention.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a zinc-aluminum coating which comprises the following components in parts by mass: 15-20 parts of zinc sheet, 8-12 parts of aluminum sheet, 15-20 parts of polyethylene glycol, 45-50 parts of water, 4.5-6.5 parts of silane derivative, 1-2.5 parts of molybdate, 1-2 parts of boric acid and 1-1.5 parts of fluorescent powder.
Preferably, the maximum sizes of the zinc sheets and the aluminum sheets are 8-10 μm independently, and the thicknesses of the zinc sheets and the aluminum sheets are 0.15-0.25 μm independently.
Preferably, the silane derivative is an alkylsilane and/or an aminosilane; the alkyl silane is methyl trimethoxy silane and/or octadecyl trichlorosilane, and the amino silane is gamma-aminopropyl triethoxysilane.
Preferably, the molybdate is potassium molybdate and/or sodium molybdate.
The invention also provides a preparation method of the zinc-aluminum coating, which comprises the following steps:
(1) mixing zinc sheets, aluminum sheets, silane derivatives, molybdate, fluorescent powder and polyethylene glycol to obtain a semi-finished product;
(2) and adding the rest raw materials into the semi-finished product, and mixing to obtain the zinc-aluminum coating.
Preferably, the rotation speed of mixing in the step (1) is 300-500 rpm, the mixing time is 1-2 h, and the mixing temperature is less than 60 ℃.
Preferably, the mixing in the step (2) is temperature-controlled stirring, the rotating speed of the temperature-controlled stirring is 500-800 rpm, the time of the temperature-controlled stirring is 6-8 hours, and the temperature of the temperature-controlled stirring is 20-30 ℃.
The invention also provides the application of the zinc-aluminum coating on corrosion prevention of metal devices.
The invention also provides a method for preventing corrosion by using the zinc-aluminum coating, which comprises the following steps:
(1) performing film forming treatment on the surface of the target part by using the zinc-aluminum coating to obtain a coating part;
(2) and baking the coating piece to obtain a finished product piece.
Preferably, the baking temperature in the step (2) is 200-380 ℃, and the baking time is 20-50 min.
The invention provides a zinc-aluminum coating, which enhances the corrosion resistance of a paint film on the basis of improving the hardness and the friction coefficient of the paint film through the matching of all components, can well identify a coating missing part and an uneven part due to the addition of fluorescent substances, can carry out coating adjustment in time, and reduces the possibility of corrosion.
The invention also provides a preparation method of the coating, the coating can be obtained by simply stirring and heating in the preparation process, the operation is simple, the process requirement is low, and the production cost is saved.
The invention also provides application of the coating in corrosion prevention of metal devices, and the coating can effectively protect the metal devices.
Detailed Description
The invention provides a zinc-aluminum coating which comprises the following components in parts by mass: 15-20 parts of zinc sheet, 8-12 parts of aluminum sheet, 15-20 parts of polyethylene glycol, 45-50 parts of water, 4.5-6.5 parts of silane derivative, 1-2.5 parts of molybdate, 1-2 parts of boric acid and 1-1.5 parts of fluorescent powder.
In the present invention, the zinc sheet is 15 to 20 parts, preferably 16 to 19 parts, and more preferably 17 to 18 parts.
In the invention, the aluminum sheet is 8-12 parts, preferably 9-11 parts, and more preferably 9.5-10.5 parts.
In the invention, the maximum size of the zinc sheet and the aluminum sheet is preferably 8-10 μm independently, and more preferably 8.5-9.5 μm independently; the thicknesses of the zinc sheet and the aluminum sheet are preferably 0.15-0.25 μm independently, more preferably 0.17-0.23 μm, and even more preferably 0.18-0.22 μm.
In the invention, the zinc-aluminum sheet is used as the main component of the anticorrosive coating and plays a role in cathodic protection on the base material.
In the present invention, the polyethylene glycol is 15 to 20 parts, preferably 16 to 19 parts, and more preferably 17 to 18 parts.
According to the invention, polyethylene glycol is used as a surfactant, so that the leveling property of the coating is improved, and the bonding property among the raw materials of the coating is also improved.
In the present invention, the amount of the water is 45 to 50 parts, preferably 46 to 49 parts, and more preferably 47 to 48 parts.
In the present invention, the silane derivative is 4.5 to 6.5 parts, preferably 5 to 6 parts, and more preferably 5.25 to 5.75 parts.
In the present invention, the silane derivative is preferably an alkylsilane and/or an aminosilane; the alkylsilane is preferably methyltrimethoxysilane and/or octadecyltrichlorosilane and the aminosilane is preferably gamma-aminopropyltriethoxysilane.
In the invention, the silane derivative is used as a binding agent, so that the binding force among the components is improved, and the compactness of a paint film after being dried is improved.
In the present invention, the amount of the molybdate is 1 to 2.5 parts, preferably 1.25 to 2.25 parts, and more preferably 1.5 to 2 parts.
In the present invention, the molybdate is preferably potassium molybdate and/or sodium molybdate.
In the present invention, the boric acid is 1 to 2 parts, preferably 1.25 to 1.75 parts.
In the invention, molybdate and boric acid are used as a passivation system to passivate the zinc-aluminum sheet, thereby improving the corrosion resistance of the zinc-aluminum sheet and prolonging the protection time of the zinc-aluminum sheet on a base material.
In the invention, the fluorescent powder is 1-1.5 parts, preferably 1.05-1.45 parts, and more preferably 1.1-1.4 parts.
The fluorescent powder is spherical particles, and the diameter of the fluorescent powder is preferably 15-25 μm, and more preferably 18-22 μm. The fluorescent powder used in the invention has good solvent resistance and acid and alkali resistance.
The invention also provides a preparation method of the zinc-aluminum coating, which comprises the following steps:
(1) mixing zinc sheets, aluminum sheets, silane derivatives, molybdate, fluorescent powder and polyethylene glycol to obtain a semi-finished product;
(2) and adding the rest raw materials into the semi-finished product, and mixing to obtain the zinc-aluminum coating.
In the invention, the rotation speed of mixing in the step (1) is preferably 300-500 rpm, and more preferably 350-450 rpm; the mixing time is preferably 1-2 h, and more preferably 1.2-1.8 h; the temperature of the mixing is preferably less than 60 ℃, more preferably less than 50 ℃.
The mixing in the step (1) of the invention can release a large amount of heat, and circulating water is used for cooling and temperature control. The stirring in the step (1) is convenient for coating the silane derivative and the polyethylene glycol on the surfaces of the fluorescent powder and the zinc-aluminum sheet and then dispersing in water; the bonding force among the fluorescent powder, the zinc-aluminum sheet and the silane derivative is ensured to be optimal after baking and curing.
In the invention, the mixing in the step (2) is preferably temperature-controlled stirring, and the rotation speed of the temperature-controlled stirring is preferably 500-800 rpm, and more preferably 600-700 rpm; the temperature-controlled stirring time is preferably 6-8 h, and further preferably 6.5-7.5 h; the temperature of the temperature-controlled stirring is preferably 20-30 ℃, more preferably 22-28 ℃, and even more preferably 24-26 ℃.
The invention also provides the application of the zinc-aluminum coating on corrosion prevention of metal devices.
The invention also provides a method for preventing corrosion by using the zinc-aluminum coating, which comprises the following steps:
(1) performing film forming treatment on the surface of the target part by using the zinc-aluminum coating to obtain a coating part;
(2) and baking the coating piece to obtain a finished product piece.
In the present invention, the film forming treatment in the step (1) is preferably immersion centrifugation or spraying; the rotating speed of the dipping centrifugation is preferably 200-300 rpm, more preferably 220-280 rpm, and even more preferably 240-260 rpm; the dipping and centrifuging time is preferably 10-40 s, and more preferably 20-30 s; the spraying pressure is preferably 0.3-0.6 Mpa, and further preferably 0.4-0.5 Mpa;
in the invention, the baking temperature in the step (2) is preferably 200-380 ℃, more preferably 240-340 ℃, and more preferably 280-320 ℃; the baking time is preferably 20-50 min, more preferably 30-40 min, and even more preferably 34-36 min.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The zinc-aluminum coating comprises the following components in parts by mass: 19 parts of zinc sheet, 9 parts of aluminum sheet, 16 parts of polyethylene glycol, 48 parts of water, 5 parts of methyltrimethoxysilane, 1 part of sodium molybdate, 1 part of boric acid and 1 part of fluorescent powder.
Example 2
The zinc-aluminum coating comprises the following components in parts by mass: 18 parts of zinc sheet, 8 parts of aluminum sheet, 16 parts of polyethylene glycol, 50 parts of water, 4.5 parts of octadecyl trichlorosilane, 1.5 parts of potassium molybdate, 1 part of boric acid and 1 part of fluorescent powder.
Example 3
The zinc-aluminum coating comprises the following components in parts by mass: 17 parts of zinc sheet, 10 parts of aluminum sheet, 18 parts of polyethylene glycol, 48 parts of water, 5 parts of gamma-aminopropyl triethoxysilane, 2 parts of sodium molybdate, 1.5 parts of boric acid and 1.2 parts of fluorescent powder.
Example 4
The zinc-aluminum coating comprises the following components in parts by mass: 18 parts of zinc sheet, 11 parts of aluminum sheet, 16 parts of polyethylene glycol, 47 parts of water, 4.5 parts of methyltrimethoxysilane, 1.5 parts of sodium molybdate, 1.5 parts of boric acid and 1 part of fluorescent powder.
Comparative example 1
The coating comprises the following components in parts by mass: 19 parts of zinc sheet, 9 parts of aluminum sheet, 16 parts of polyethylene glycol, 48 parts of water, 1 part of sodium molybdate, 1 part of boric acid and 1 part of fluorescent powder.
Comparative example 2
The coating comprises the following components in parts by mass: 19 parts of zinc sheet, 9 parts of aluminum sheet, 16 parts of polyethylene glycol, 48 parts of water and 5 parts of methyltrimethoxysilane.
Application example 1
The application example used the zinc-aluminum paint in example 1.
Mixing zinc sheets, aluminum sheets, methyltrimethoxysilane, sodium molybdate, fluorescent powder and polyethylene glycol at the rotation speed of 400rpm for 1.5h, and controlling the mixing temperature to be 50 ℃. After the mixing, the remaining water and boric acid were added and the stirring was continued. The stirring speed is 650rpm, the time is 6.5h, and the stirring temperature is 25 ℃, so that the zinc-aluminum coating is obtained.
Coating the obtained solution on a product by adopting a dipping centrifugation process, wherein the rotating speed of the dipping centrifugation process is 250 rpm; dipping and centrifuging for 30s to obtain a coating piece, and baking the coating piece at the baking temperature of 320 ℃; baking for 35min to obtain the final product.
Testing the neutral salt spray performance of the obtained finished product according to ISO9227 neutral salt spray test Standard of zinc and zinc alloy coatings; the fluorescence effect was tested under excitation by ultraviolet light at 365 nm. The test results are reported in table 1.
Application example 2
The application example used the zinc-aluminum paint in example 2.
The present application example used the same preparation method and test procedure as in application example 1.
The test results are reported in table 1.
Application example 3
The application example used the zinc-aluminum paint in example 3.
The present application example used the same preparation method and test procedure as in application example 1.
The test results are reported in table 1.
Application example 4
The application example used the zinc-aluminum paint in example 4.
The present application example used the same preparation method and test procedure as in application example 1.
The test results are reported in table 1.
Application comparative example 1
The comparative example of the present application used the coating in comparative example 1.
The comparative example of this application used the same preparation method and test procedure as in application example 1.
The test results are reported in table 1.
Comparative application example 2
The comparative example of the present application used the coating in comparative example 2.
The comparative example of this application used the same preparation method and test procedure as in application example 1.
The test results are reported in table 1.
TABLE 1 test results
The embodiment shows that the zinc-aluminum coating provided by the invention can effectively improve the corrosion resistance of the base material in neutral salt fog, and the coating leakage part can be coated in time due to the addition of the fluorescent powder, so that the corrosion of the base material is prevented from being accelerated due to incomplete coating.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The zinc-aluminum coating is characterized by comprising the following components in parts by mass: 15-20 parts of zinc sheet, 8-12 parts of aluminum sheet, 15-20 parts of polyethylene glycol, 45-50 parts of water, 4.5-6.5 parts of silane derivative, 1-2.5 parts of molybdate, 1-2 parts of boric acid and 1-1.5 parts of fluorescent powder.
2. The zinc-aluminum paint according to claim 1, wherein the maximum sizes of the zinc flakes and the aluminum flakes are 8 to 10 μm independently, and the thicknesses of the zinc flakes and the aluminum flakes are 0.15 to 0.25 μm independently.
3. The zinc-aluminum coating of claim 1, wherein the silane derivative is an alkylsilane and/or an aminosilane; the alkyl silane is methyl trimethoxy silane and/or octadecyl trichlorosilane, and the amino silane is gamma-aminopropyl triethoxysilane.
4. The zinc-aluminum paint according to any one of claims 1 to 3, wherein the molybdate is potassium molybdate and/or sodium molybdate.
5. The method for preparing the zinc-aluminum coating of any one of claims 1 to 4, characterized by comprising the following steps:
(1) mixing zinc sheets, aluminum sheets, silane derivatives, molybdate, fluorescent powder and polyethylene glycol to obtain a semi-finished product;
(2) and adding the rest raw materials into the semi-finished product, and mixing to obtain the zinc-aluminum coating.
6. The method according to claim 5, wherein the mixing in step (1) is performed at a rotation speed of 300 to 500rpm for 1 to 2 hours at a temperature of less than 60 ℃.
7. The preparation method according to claim 5 or 6, wherein the mixing in the step (2) is temperature-controlled stirring, the rotation speed of the temperature-controlled stirring is 500-800 rpm, the time of the temperature-controlled stirring is 6-8 h, and the temperature of the temperature-controlled stirring is 20-30 ℃.
8. Use of the zinc-aluminium coating of any one of claims 1 to 4 in the corrosion protection of metal devices.
9. A method for corrosion prevention using the zinc-aluminum paint according to any one of claims 1 to 4, characterized by comprising the steps of:
(1) performing film forming treatment on the surface of the target part by using the zinc-aluminum coating to obtain a coating part;
(2) and baking the coating piece to obtain a finished product piece.
10. The method of claim 9, wherein the baking temperature in the step (2) is 200-380 ℃, and the baking time is 20-50 min.
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| CN202010296908.7A CN111363459A (en) | 2020-04-15 | 2020-04-15 | Zinc-aluminum coating and preparation method and application thereof |
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| CN202010296908.7A CN111363459A (en) | 2020-04-15 | 2020-04-15 | Zinc-aluminum coating and preparation method and application thereof |
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