CN116377528A - High-corrosion-resistance double-coating color-coated plate and production method thereof - Google Patents
High-corrosion-resistance double-coating color-coated plate and production method thereof Download PDFInfo
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- CN116377528A CN116377528A CN202310306125.6A CN202310306125A CN116377528A CN 116377528 A CN116377528 A CN 116377528A CN 202310306125 A CN202310306125 A CN 202310306125A CN 116377528 A CN116377528 A CN 116377528A
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- 238000000576 coating method Methods 0.000 title claims abstract description 100
- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000010410 layer Substances 0.000 claims abstract description 92
- 239000011701 zinc Substances 0.000 claims abstract description 56
- -1 zinc-aluminum-magnesium Chemical compound 0.000 claims abstract description 56
- 238000007747 plating Methods 0.000 claims abstract description 55
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 51
- 239000002987 primer (paints) Substances 0.000 claims abstract description 50
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000009713 electroplating Methods 0.000 claims abstract description 38
- 239000003973 paint Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005260 corrosion Methods 0.000 claims abstract description 25
- 230000007797 corrosion Effects 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000011247 coating layer Substances 0.000 claims abstract description 6
- 239000005002 finish coating Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims description 8
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 8
- 229960001763 zinc sulfate Drugs 0.000 claims description 8
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052729 chemical element Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 9
- 239000000758 substrate Substances 0.000 description 8
- 238000009500 colour coating Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000004814 polyurethane Substances 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000004925 Acrylic resin Substances 0.000 description 5
- 229920000178 Acrylic resin Polymers 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910017706 MgZn Inorganic materials 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
-
- 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
- B05D7/16—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 using synthetic lacquers or varnishes
-
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Electroplating Methods And Accessories (AREA)
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Abstract
The invention discloses a high corrosion-resistant double-plating color-coated plate and a production method thereof. The production method comprises the processes of electroplating, primer coating and finish coating; the electroplating process comprises the following steps: using zinc liquid as electroplating liquid, and electroplating on the zinc-aluminum-magnesium plating plate to form a zinc layer; the primer coating process comprises the following steps: coating a primer on the surface of the zinc layer, and drying to form a primer layer; the finishing paint coating process comprises the following steps: and coating finishing paint on the surface of the primer layer, and drying to form a finishing paint layer. The zinc layer is electroplated between the zinc-aluminum-magnesium coating and the coating layer, the zinc layer has good combination with the zinc-aluminum-magnesium coating, and the zinc layer has smooth surface and good corrosion resistance, so that the surface quality and corrosion resistance of the color-coated plate are effectively improved, the quality of the color-coated plate is effectively improved, and the color-coated plate can be applied to household appliance outer plates with higher requirements on the surface quality.
Description
Technical Field
The invention relates to a color-coated plate and a production method thereof, in particular to a high-corrosion-resistance double-plating color-coated plate and a production method thereof.
Background
The color-coated plate is a common corrosion-resistant composite material which is widely applied to the fields of buildings and household appliances, and at present, a base plate is mainly a galvanized plate, and zinc-aluminum-magnesium plate, aluminum-zinc-silicon plate and stainless steel plate are partially used.
The zinc-aluminum-magnesium product has good corrosion resistance and notch protection, the corrosion resistance can be 5-15 times that of a common galvanized plate, the notch position has self-healing capability, and the corrosion resistance of the product can be greatly improved by combining the protection of color coating on the surface.
For low-aluminum and medium-aluminum zinc aluminum magnesium products, the surface of the product is rich-zinc phase bulges, mgZn 2 Binary eutectic phase of Zn and MgZn 2 A Zn/Al ternary eutectic phase; for high-aluminum zinc-aluminum-magnesium products, the surfaces of the high-aluminum zinc-aluminum-magnesium products are aluminum-rich phase bulges, zinc-rich phase bulges and MgZn 2 Mg and Mg 2 And Si phase. Because of the solidification characteristic of the zinc-aluminum-magnesium product, the surface roughness of the zinc-aluminum-magnesium product is uneven, and the roughness of the zinc-aluminum-magnesium product can be changed through leveling, but the surface appearance of the zinc-aluminum-magnesium product is still greatly different from that of a galvanized product, and the color-coated product taking a zinc-aluminum-magnesium coated steel plate as a substrate cannot be applied to an outer plate of a household appliance with high requirements on surface quality.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the high-corrosion-resistance double-plating color-coated plate with good surface quality; the invention also provides a production method of the high-corrosion-resistance double-plating color-coated plate.
In order to solve the technical problems, the invention adopts the following technical scheme: the surface of the zinc-aluminum-magnesium plating plate is electroplated with a zinc layer, and the surface of the zinc layer is color-coated with a coating layer.
The thickness of the zinc layer shown in the invention is 1-4 mu m.
The chemical element components of the zinc-aluminum-magnesium plating layer in the zinc-aluminum-magnesium plating layer plate are as follows: 1.0 to 3.5 weight percent of Al, 1.0 to 2.5 weight percent of Mg, 0.01 to 0.1 weight percent of Re, and the balance of Zn and unavoidable impurities.
The coating layer comprises a primer layer and a top coat layer.
The method comprises the processes of electroplating, primer coating and finish coating; the electroplating process comprises the following steps: using zinc liquid as electroplating liquid, and electroplating on the zinc-aluminum-magnesium plating plate to form a zinc layer;
the primer coating process comprises the following steps: coating a primer on the surface of the zinc layer, and drying to form a primer layer;
the finishing paint coating process comprises the following steps: and coating finishing paint on the surface of the primer layer, and drying to form a finishing paint layer.
In the electroplating process of the method, the electroplating solution is zinc sulfate solution with the concentration of 200-400 g/L, the electroplating speed of 40-60 m/min and the current of 6000-12000A.
According to the method, a roller coating method is adopted in both the primer coating process and the finish coating process.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the zinc layer is electroplated between the zinc-aluminum-magnesium coating and the coating layer, the zinc layer has good combination with the zinc-aluminum-magnesium coating, and the zinc layer has smooth surface and good corrosion resistance, so that the surface quality and corrosion resistance of the color-coated plate are effectively improved, the quality of the color-coated plate is effectively improved, and the color-coated plate can be applied to household appliance outer plates with higher requirements on the surface quality.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a layered structure of a color coated sheet according to the present invention.
In the figure: a steel plate 1; zinc aluminum magnesium coating 2; a zinc layer 3; a primer layer 4; a top coat layer 5.
Detailed Description
As shown in figure 1, the high corrosion resistant double-plating color coated plate takes a zinc-aluminum-magnesium plating plate as a color coated substrate. The zinc-aluminum-magnesium plating layer takes a steel plate 1 as a base material, a zinc-aluminum-magnesium plating layer 2 is hot dip plated on the surface of the steel plate 1, and the thickness of the zinc-aluminum-magnesium plating layer 2 is 10-25 mu m; the zinc-aluminum-magnesium coating 2 comprises the following chemical elements: 1.0 to 3.5 weight percent of Al, 1.0 to 2.5 weight percent of Mg, 0.01 to 0.1 weight percent of Re, and the balance of Zn and unavoidable impurities. The surface of the zinc-aluminum-magnesium plating plate is electroplated with a zinc layer 3, and the thickness of the zinc layer 3 is 1-4 mu m. The surface of the zinc layer 3 is coated with a paint layer in a color mode, and the paint layer comprises a primer layer 4 and a top paint layer 5; the primer layer 4 is coated on the surface of the zinc layer 3, and is made of epoxy resin or polyurethane with the thickness of 12-20 mu m; the finish paint layer 5 is coated on the surface of the primer layer 4, and adopts acrylic resin, silicon modified polyester or fluorocarbon resin, and the thickness is 10-18 mu m.
The production method of the high corrosion resistant double-plating color-coated plate adopts uncoiling, stitching, cleaning, electroplating, cleaning, passivation, primer coating, drying, finish coating, drying, air cooling and cold rolling processes; the line speed of the production line is 80-120 m/min during coating, and the process technology is as follows: (1) The zinc-aluminum-magnesium plating plate is subjected to electroplating after uncoiling, stitching and cleaning; the electroplating process comprises the following steps: the zinc sulfate solution is used as electroplating solution, the concentration is 200-400 g/L, the electroplating speed is 40-60 m/min, the current is 6000-12000A, and a zinc layer is formed on the zinc-aluminum-magnesium plating layer plate by electroplating.
(2) Cleaning and passivating the plate plated with the zinc layer, and then coating the primer; the primer coating process comprises the following steps: coating a primer on the surface of the zinc layer, and drying to form a primer layer; the primer coating process adopts a roll coating method, wherein the material lifting roll speed is the coating roll speed, the supporting roll speed= (0.3-0.5): (1.2-1.5): 1, wherein the supporting roll speed is the line speed of the production line; the primer adopts epoxy resin or polyurethane, and the thickness of the primer layer is 12-20 mu m. And (3) drying the plate coated with the primer, wherein the baking temperature is 240-270 ℃.
(3) The plate after the primer is dried is coated with a finish paint; the finishing paint coating process comprises the following steps: coating a finishing paint on the surface of the primer layer, and drying to form a finishing paint layer; the finishing paint coating process adopts a roll coating method, wherein the roll speed of a regulating roll is the roll speed of a lifting roll, the roll speed of a coating roll is the roll speed of a supporting roll= (0.05-0.1): (0.2-0.7): (1.2-1.5): 1, wherein the roll speed of the supporting roll is the linear speed of a production line; the finishing coat adopts acrylic resin, silicon modified polyester or fluorocarbon resin, and the thickness of the finishing coat is 10-18 mu m. And (3) drying the plate coated with the finish paint, wherein the baking temperature is 260-290 ℃. And cooling and rolling the dried plate by air cooling to obtain the double-coating color-coated plate finished product.
Example 1: the high corrosion resistant double-plating color coated plate is produced by the following method and process.
The zinc-aluminum-magnesium plating layer is used as a color coating substrate, the thickness of the zinc-aluminum-magnesium plating layer is 25 mu m, and the plating layer comprises the following components (wt): al 1.0%, mg 1.0%, re 0.01%, and Zn and other unavoidable impurities in balance. Electroplating a zinc layer on the zinc-aluminum-magnesium plating plate, wherein a zinc sulfate solution is used as an electroplating solution, the concentration is 200g/L, the electroplating speed is 60 m/min, the current is 6000A, and the thickness of the zinc layer is 1 mu m.
The line speed is 120m/min during coating; the primer is epoxy resin, the coating process is roll coating, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.3:1.2:1, the baking temperature of the primer is 240 ℃, and the thickness is 20 mu m; the finish paint is acrylic resin, the coating process is a roll coating method, wherein the roll speed of a regulating roll is the roll speed of a lifting roll, the roll speed of a coating roll is the roll speed of a supporting roll=0.1:0.7:1.5:1, the baking temperature of the finish paint is 260 ℃, and the thickness is 10 mu m.
Example 2: the high corrosion resistant double-plating color coated plate is produced by the following method and process.
The zinc-aluminum-magnesium plating layer is used as a color coating substrate, the thickness of the zinc-aluminum-magnesium plating layer is 23 mu m, and the plating layer comprises the following components (wt): al 1.5%, mg 1.3%, re 0.03%, and Zn and other unavoidable impurities in balance. Electroplating a zinc layer on the zinc-aluminum-magnesium plating plate, wherein a zinc sulfate solution is used as an electroplating solution, the concentration is 200g/L, the electroplating speed is 50 m/min, the current is 10000A, and the thickness of the zinc layer is 2 mu m.
The line speed is 110m/min during coating; the primer is epoxy resin, the coating process is roll coating, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.35:1.2:1, the baking temperature of the primer is 250 ℃, and the thickness is 19 mu m; the finish paint is acrylic resin, the coating process is a roll coating method, wherein the roll speed of a regulating roll is the roll speed of a lifting roll, the roll speed of a coating roll is the roll speed of a supporting roll=0.09:0.6:1.4:1, the baking temperature of the finish paint is 270 ℃, and the thickness is 12 mu m.
Example 3: the high corrosion resistant double-plating color coated plate is produced by the following method and process.
The zinc-aluminum-magnesium plating layer is used as a color coating substrate, the thickness of the zinc-aluminum-magnesium plating layer is 20 mu m, and the plating layer comprises the following components (wt): al 2.0%, mg 1.8%, re 0.05%, and Zn and other unavoidable impurities in balance. Electroplating a zinc layer on the zinc-aluminum-magnesium plating plate, wherein a zinc sulfate solution is used as an electroplating solution, the concentration is 300g/L, the electroplating speed is 40 m/min, the current is 10000A, and the thickness of the zinc layer is 3 mu m.
The line speed is 100m/min during coating; the primer is polyurethane, the coating process is a roll coating method, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.4:1.5:1, the baking temperature of the primer is 260 ℃, and the thickness is 17 mu m; the finish paint is silicon modified polyester, the coating process is a roll coating method, wherein the roll speed of a regulating roll is that of a lifting roll, the roll speed of a coating roll is that of a supporting roll, the roll speed of the supporting roll is=0.07:0.4:1.3:1, the baking temperature of the finish paint is 280 ℃, and the thickness of the finish paint is 15 mu m.
Example 4: the high corrosion resistant double-plating color coated plate is produced by the following method and process.
The zinc-aluminum-magnesium plating layer is used as a color coating substrate, the thickness of the zinc-aluminum-magnesium plating layer is 15 mu m, and the plating layer comprises the following components (wt): al 2.5%, mg 2.0%, re 0.07%, and Zn and other unavoidable impurities in balance. The zinc layer is electroplated on the zinc-aluminum-magnesium plating plate, the zinc sulfate solution is used as the electroplating solution, the concentration is 400g/L, the electroplating speed is 40 m/min, the current is 12000A, and the thickness of the zinc layer is 4 mu m.
The line speed is 90m/min during coating; the primer is polyurethane, the coating process is a roll coating method, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.5:1.3:1, the baking temperature of the primer is 270 ℃, and the thickness is 15 mu m; the finish paint is fluorocarbon resin, the coating process is a roll coating method, wherein the roll speed of a regulating roll, the roll speed of a lifting roll, the roll speed of a coating roll, the roll speed of a supporting roll and the roll speed=0.06:0.3:1.2:1, the baking temperature of the finish paint is 280 ℃, and the thickness is 17 mu m.
Example 5: the high corrosion resistant double-plating color coated plate is produced by the following method and process.
Taking a zinc-aluminum-magnesium plating layer as a color-coated substrate, wherein the thickness of the zinc-aluminum-magnesium plating layer is 10 mu m, and the plating layer comprises the following components (wt): al 3.5%, mg 2.5%, re 0.1%, and Zn and other unavoidable impurities in balance. The zinc layer is electroplated on the zinc-aluminum-magnesium plating plate, the zinc sulfate solution is used as the electroplating solution, the concentration is 400g/L, the electroplating speed is 40 m/min, the current is 12000A, and the thickness of the zinc layer is 4 mu m.
The line speed is 80m/min during coating; the primer is polyurethane, the coating process is a roll coating method, wherein the material lifting roll speed is that of a coating roll, the material lifting roll speed is that of a supporting roll (production line speed) =0.5:1.4:1, the baking temperature of the primer is 270 ℃, and the thickness is 12 mu m; the finish paint is fluorocarbon resin, the coating process is a roll coating method, wherein the roll speed of a regulating roll, the roll speed of a lifting roll, the roll speed of a coating roll, the roll speed of a supporting roll and the roll speed=0.05:0.2:1.2:1, the baking temperature of the finish paint is 290 ℃, and the thickness is 18 mu m.
Comparative example 1: the plating color-coated plate is produced by adopting the following process.
The same steel sheet as in example 1 was used as a base material, and a zinc aluminum magnesium plating layer was hot dip plated on the steel sheet, and a zinc layer was directly electroplated, with the zinc layer having a thickness of 30 μm.
The obtained galvanized sheet is directly subjected to color coating; the line speed is 120m/min during coating; the primer is polyurethane, the coating process is a roll coating method, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.3:1.2:1, the baking temperature of the primer is 240 ℃, and the thickness is 20 mu m; the finish paint is fluorocarbon resin, the coating process is a roll coating method, wherein the roll speed of the roll is regulated: lifting roller speed, coating roller speed, backing roller speed=0.1:0.7:1.5:1, finishing coat baking temperature is 260 ℃, and thickness is 10 μm.
Comparative example 2: the plating color-coated plate is produced by adopting the following process.
The same steel sheet as in example 2 was used as a base material, and a zinc aluminum magnesium plating layer was hot dip plated on the steel sheet, and a zinc layer was directly electroplated, with the zinc layer having a thickness of 10 μm.
The obtained galvanized sheet is directly subjected to color coating; the line speed is 80m/min during coating; the primer is epoxy resin, the coating process is roll coating, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.35:1.2:1, the baking temperature of the primer is 250 ℃, and the film thickness is 19 mu m; the finish paint is acrylic resin, the coating process is a roll coating method, wherein the roll speed of a regulating roll, the roll speed of a lifting roll, the roll speed of a coating roll, the roll speed of a supporting roll and the roll speed=0.09:0.6:1.4:1, the baking temperature of the finish paint is 270 ℃, and the film thickness is 12 mu m.
Comparative example 3: the plating color-coated plate is produced by adopting the following process.
The same zinc-aluminum-magnesium plate as in example 3 was used as a base material, and the zinc-aluminum-magnesium plating layer was 23 μm thick and was directly color-coated without electroplating.
The line speed is 100m/min during coating; the primer is polyurethane, the coating process is a roll coating method, wherein the roll speed of a lifting roll is that of a coating roll, the roll speed of a supporting roll is that of a supporting roll=0.4:1.5:1, the baking temperature of the primer is 260 ℃, and the thickness is 17 mu m; the finish paint is silicon modified polyester, the coating process is a roll coating method, wherein the roll speed of a regulating roll is that of a lifting roll, the roll speed of a coating roll is that of a supporting roll, the roll speed of the supporting roll is=0.07:0.4:1.3:1, the baking temperature of the finish paint is 280 ℃, and the thickness of the finish paint is 15 mu m.
The color coated sheets obtained in examples 1 to 5 and comparative examples 1 to 3 were subjected to the painting x salt spray test, respectively, and the results are shown in table 1 below;
table 1: red rust time of salt fog at picture x
As can be seen from Table 1, the painting X salt fog red rust time of examples 1-5 is greatly improved compared with that of comparative example 1 and comparative example 2, and is similar to that of comparative example 3, so that the painting X corrosion resistance of the coating is obviously superior to that of the conventional zinc coating and is equivalent to that of the zinc-aluminum-magnesium coating.
The surface quality of the coated products of examples 1-5 and comparative examples 1-3 is shown in Table 2, and the detection method is shown in GB/T2518-2008 continuous hot dip galvanized steel sheet and steel strip and GB/T15675-2008 continuous electrogalvanized, zinc-nickel alloy coated steel sheet and steel strip;
table 2: surface quality of coating
As can be seen from table 2, after the surface plating is performed in the present application, compared with the surface quality of the product without the electrogalvanizing in comparative example 3, the surface quality is effectively improved, and the product can be used for the home appliance outer plate substrate.
In conclusion, the method can effectively combine the high corrosion resistance of the zinc-aluminum-magnesium product with the high surface quality of the electrogalvanized product, and realize the organic combination of the zinc-aluminum-magnesium product and the electrogalvanized product.
Claims (7)
1. A high corrosion resistant double-plating color coated plate is characterized in that: the surface of the zinc-aluminum-magnesium plating plate is electroplated with a zinc layer, and the surface of the zinc layer is color-coated with a coating layer.
2. The high corrosion resistant double-coated color plate according to claim 1, wherein: the thickness of the zinc layer is 1-4 mu m.
3. The high corrosion resistant double-coated color plate according to claim 1, wherein: the chemical element components of the zinc-aluminum-magnesium plating layer in the zinc-aluminum-magnesium plating layer plate are as follows: 1.0 to 3.5 weight percent of Al, 1.0 to 2.5 weight percent of Mg, 0.01 to 0.1 weight percent of Re, and the balance of Zn and unavoidable impurities.
4. A highly corrosion resistant double-coated color coated sheet according to claim 1, 2 or 3, characterized in that: the coating layer includes a primer layer and a topcoat layer.
5. The method for producing the high corrosion resistant double-coating color coated sheet according to any one of claims 1 to 4, characterized in that: the method comprises the processes of electroplating, primer coating and finish coating; the electroplating process comprises the following steps: using zinc liquid as electroplating liquid, and electroplating on the zinc-aluminum-magnesium plating plate to form a zinc layer;
the primer coating process comprises the following steps: coating a primer on the surface of the zinc layer, and drying to form a primer layer;
the finishing paint coating process comprises the following steps: and coating finishing paint on the surface of the primer layer, and drying to form a finishing paint layer.
6. The high corrosion resistant double-coated color plate according to claim 5, wherein: in the electroplating process, the electroplating solution is zinc sulfate solution with the concentration of 200-400 g/L, the electroplating speed of 40-60 m/min and the current of 6000-12000A.
7. The method for producing the high corrosion resistant double-coating color coated sheet according to claim 5 or 6, wherein the method comprises the following steps: the primer coating process and the finish coating process both adopt a roll coating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310306125.6A CN116377528A (en) | 2023-03-27 | 2023-03-27 | High-corrosion-resistance double-coating color-coated plate and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310306125.6A CN116377528A (en) | 2023-03-27 | 2023-03-27 | High-corrosion-resistance double-coating color-coated plate and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116377528A true CN116377528A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310306125.6A Pending CN116377528A (en) | 2023-03-27 | 2023-03-27 | High-corrosion-resistance double-coating color-coated plate and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116377528A (en) |
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2023
- 2023-03-27 CN CN202310306125.6A patent/CN116377528A/en active Pending
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