CN109778174B - Aluminum-zinc-magnesium coating with high compactness and preparation method thereof - Google Patents
Aluminum-zinc-magnesium coating with high compactness and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 38
- -1 Aluminum-zinc-magnesium Chemical compound 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000007747 plating Methods 0.000 claims abstract description 55
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 28
- 239000011701 zinc Substances 0.000 claims abstract description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002243 precursor Substances 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 10
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 9
- 239000011777 magnesium Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 239000010936 titanium Substances 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 31
- 239000012298 atmosphere Substances 0.000 claims description 24
- 229920002749 Bacterial cellulose Polymers 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 239000005016 bacterial cellulose Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000011812 mixed powder Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 239000003921 oil Substances 0.000 claims 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 5
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- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 30
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009500 colour coating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 230000008520 organization Effects 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
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- 239000003223 protective agent Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
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Abstract
The invention relates to the field of metal coatings, and provides an aluminum-zinc-magnesium coating with high compactness and a preparation method thereof in order to solve the problems of poor anode protection effect and inconvenient use or processing of the conventional aluminum-zinc coating. The plating layer comprises the following components in percentage by weight: 55wt% of aluminum, 42.5 to 43wt% of zinc, 1.0 to 1.6wt% of silicon, 0.8 to 1.2wt% of magnesium, 0.008 to 0.012wt% of nickel, 0.006 to 0.01wt% of strontium, and 0.002 to 0.005wt% of titanium. The preparation mainly comprises the following steps: 1) prefabricating raw materials; 2) pre-treating a substrate; 3) preparing a precursor; 4) and (4) preparing a plating layer. The invention improves the anode protection effect, the mechanical property and the corrosion resistance of the aluminum-zinc coating, so that the aluminum-zinc coating has longer service life; the formed crystal grains are finer and the skeleton structure is formed, so that the high-temperature-resistant composite material has better temperature resistance.
Description
Technical Field
The invention relates to the field of metal coatings, in particular to an aluminum-zinc-magnesium coating with high compactness and a preparation method thereof.
Background
The aluminum-zinc plated plate is a plate coated with an alloy coating with aluminum and zinc as main components, the aluminum-zinc plating layer on the surface of the existing aluminum-zinc plated plate contains 55wt% of aluminum, 43.4wt% of zinc and 1.6wt% of silicon, and the aluminum-zinc plated plate is plated by a hot dip plating method at the temperature of 600 ℃, and the whole structure of the aluminum-zinc plated plate consists of compact quaternary crystals formed by aluminum-iron-silicon-zinc. The coating is applied to the fields of buildings, automobiles, household appliances, agriculture, heat exchangers and the like, has good corrosion resistance, heat reflectivity and economy, and has better adhesive force and flexibility for color coating products.
However, the aluminum-plated zinc sheet still has use defects. The existing aluminum-zinc coating is composed of 55wt% of aluminum and 43.4wt% of zinc as main components, the surface of the coating is of a honeycomb structure under the microscopic level, and the aluminum-rich phase honeycomb composed of aluminum contains the zinc-rich phase, in this case, the aluminum-zinc coating also plays a role of anode protection, but on one hand, the zinc material is not easy to electrolyze because of being coated by the aluminum, the role of anode protection is greatly reduced, and once the aluminum-zinc coating is damaged or cut, the protection is basically lost at the damaged part or cut edge, so the existing plate plated with the aluminum-zinc coating must avoid damage and cutting as much as possible when in use, and after the damage and cutting, the plate needs to be protected by antirust paint or zinc-rich paint, and the service life of the plate can be prolonged.
Disclosure of Invention
The invention provides an aluminum-zinc-magnesium coating with high compactness and a preparation method thereof, aiming at solving the problems of poor anode protection effect and inconvenient use or processing generated by the existing aluminum-zinc coating. The method aims to achieve the purpose of enhancing the anode protection effect of the coating and improve the corrosion resistance and the mechanical property of the coating on the basis.
In order to achieve the purpose, the invention adopts the following technical scheme.
An aluminum-zinc-magnesium coating with high compactness comprises the following components in percentage by weight: 55wt% of aluminum, 42.5 to 43wt% of zinc, 1.0 to 1.6wt% of silicon, 0.8 to 1.2wt% of magnesium, 0.008 to 0.012wt% of nickel, 0.006 to 0.01wt% of strontium, and 0.002 to 0.005wt% of titanium.
The invention adjusts the zinc content and the silicon content to a certain degree, and adds four microelements of magnesium, nickel, strontium and titanium. The addition of the four trace elements can provide more heterogeneous nucleation points for the aluminum zinc coating in the forming process, and is beneficial to reducing the size of spangles. The titanium has no obvious influence on the texture and the formability of the plating layer and exists in an aluminum-rich phase, but the corrosion resistance of the plating layer can be obviously improved. Strontium is also present in the aluminum-rich phase, and has certain influence on the tissue structure, so that the crystal lattice can be expanded, negative electricity vacancies can be generated, the electrolytic capacity of the aluminum-rich phase is enhanced, and the anode protection performance of the aluminum-rich phase is improved. Magnesium and nickel mainly exist in the aluminum-rich phase and generate a synergistic effect by being matched with strontium, so that the electrolytic capacity of the aluminum-rich phase can be further enhanced, the anode protection performance is improved, and the mechanical property of a plating layer can be improved to a certain extent.
A preparation method of an aluminum-zinc-magnesium coating with high compactness comprises the following preparation steps:
1) prefabrication of raw materials: preparing 55wt% of aluminum, 42.5-43 wt% of zinc, 1.0-1.6 wt% of silicon, 0.8-1.2 wt% of magnesium, 0.008-0.012 wt% of nickel, 0.006-0.01 wt% of strontium and 0.002-0.005 wt% of titanium, putting the aluminum and the zinc in a protective atmosphere, smelting into uniform alloy, and then crushing, grinding and blending the uniform alloy with the rest components to obtain pre-alloy powder;
2) substrate pretreatment: carrying out surface treatment on the substrate;
3) preparing a precursor: the pre-alloying powder and the bacterial cellulose powder are mixed according to the mass ratio (5-6): 1, adding the mixed powder into excessive absolute ethyl alcohol to prepare a suspension, carrying out ultrasonic oscillation or stirring and mixing uniformly, filtering and drying after mixing uniformly to obtain precursor powder;
4) preparing a plating layer: plating precursor powder on the surface of a substrate by using a mechanical plating mode, placing the substrate in a special atmosphere with low oxygen concentration and low pressure for pre-sintering after mechanical plating, preparing a rough plating layer on the surface of the substrate, flattening the rough plating layer by using a stamping flattening mode, finally placing the substrate in a protective atmosphere for heat treatment, and obtaining the aluminum-zinc-magnesium plating layer with high compactness on the surface of the substrate after heat treatment.
The precursor powder is large-particle powder formed by collecting fine metal powder with bacterial cellulose powder as a core, the precursor powder is plated on the surface of a substrate in a mechanical plating mode to form a composite plating layer, the uniformity of each component in the composite plating layer is high, and a fine aluminum-rich phase is formed by taking the bacterial cellulose as a heterogeneous nucleation point to form a simple aluminum-rich phase skeleton structure.
And removing the bacterial cellulose after preburning to form a coarse plating layer with a simple framework structure. The compactness of the rough plating layer is improved after the rough plating layer is leveled by punching, and the defect of air holes of the plating layer is reduced. And because the rough plating layer is prepared by mechanical plating and presintering, the organization structure of the rough plating layer has larger disorder property and limited mechanical property, and the heat treatment of the rough plating layer can diffuse, nucleate and grow crystal grains of each component. The mechanical property of the plating layer is improved, more fine aluminum-rich phases are generated, and the aluminum-rich phases are connected with each other to form a complete framework structure. Compared with a honeycomb structure formed by a common aluminum-zinc coating, the framework structure does not coat a zinc-rich phase, has better toughness and is not easy to damage, namely, the framework structure is not easy to damage, and the edge position after cutting still has better anode protection effect.
Preferably, the grain diameter of the prealloy powder prepared in the step 1) is 1-5 μm.
The excessive pre-alloyed powder is not beneficial to subsequent mixing with bacterial cellulose powder, the smaller the particle size is, the more beneficial the bacterial cellulose is to adsorb the powder, a finer framework structure is formed, and the mechanical property of the prepared plating layer is more excellent. However, if the particle size is too small, the mechanical plating is not easily performed.
Preferably, the surface treatment in step 2) comprises derusting, degreasing and polishing.
The surface-treated substrate can generate more excellent bonding force with the plating layer.
Preferably, the bacterial cellulose powder used in the step 3) has a particle size of 5-20 μm and a specific surface area of 3-12 m2/g。
The bacterial cellulose powder needs larger pores for adsorbing and trapping the pre-alloyed powder, and the bacterial cellulose powder in the particle size range and the specific surface area range has better using effect through a large number of tests.
Preferably, the particle size of the precursor powder prepared in the step 3) is 15-50 μm.
If the particle size of the precursor powder is too large, the particle size of the pre-alloyed powder is too large, larger pores are easily formed during mechanical plating, and adverse effects are caused on the mechanical properties of the plating layer, but the powder with poor adsorption and trapping effects or the agglomerated pre-alloyed powder or the bacterial cellulose powder easily generates pores or local component unevenness in the subsequent preparation process, and adverse effects are caused on the mechanical properties of the plating layer.
Preferably, in the special atmosphere in the step 4), the oxygen content is 1-5 vol%, the balance is nitrogen or inert gas, and the air pressure in the special atmosphere is 0.3-0.5 atm.
Under the condition of low oxygen concentration, carbon in the bacterial cellulose can be incompletely combusted under the condition of avoiding the oxidation of alloy components as much as possible to generate reducing gas, the protective agent can form protection on the alloy components, can also be used as fuel, and the low-pressure atmosphere is favorable for the formed gas components to escape from a coating layer, so that the defect of pores is avoided.
Preferably, the pre-sintering temperature in the step 4) is 360-450 ℃, and the pre-sintering time is 30-90 min.
A large number of tests show that the high-temperature pre-sintering effect can be achieved under the temperature condition and the time condition.
Preferably, the protective atmosphere in step 4) is a nitrogen atmosphere or an inert gas atmosphere.
The nitrogen atmosphere or the inert gas atmosphere can generate a good protection effect, and the coating is prevented from being oxidized.
Preferably, the heat treatment temperature in the step 4) is 480-550 ℃, and the heat treatment time is 2-4 h.
A large number of tests show that the heat treatment effect can be better under the temperature condition and the time condition.
The invention has the beneficial effects that:
1) the anode protection effect of the aluminum-zinc coating is improved;
2) the mechanical property and the corrosion resistance of the aluminum-zinc coating are improved, so that the aluminum-zinc coating has longer service life;
3) because the formed crystal grains are finer and the skeleton structure is formed, the compactness is extremely high, and the heat resistance is better.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.
Examples 1 to 5
A method for preparing an aluminum-zinc-magnesium coating with high compactness according to claim 1, comprising the following preparation steps:
1) prefabrication of raw materials: preparing 55wt% of aluminum, 42.5-43 wt% of zinc, 1.0-1.6 wt% of silicon, 0.8-1.2 wt% of magnesium, 0.008-0.012 wt% of nickel, 0.006-0.01 wt% of strontium and 0.002-0.005 wt% of titanium, putting the aluminum and the zinc in a protective atmosphere, smelting into uniform alloy, and then crushing, grinding and blending the uniform alloy with the rest components to obtain pre-alloy powder;
2) substrate pretreatment: carrying out surface treatment such as derusting, degreasing, polishing and the like on the substrate;
3) preparing a precursor: the pre-alloying powder and the bacterial cellulose powder are mixed according to the mass ratio (5-6): 1, adding the mixed powder into excessive absolute ethyl alcohol to prepare a suspension, carrying out ultrasonic oscillation or stirring and mixing uniformly, filtering and drying after mixing uniformly to obtain precursor powder;
4) preparing a plating layer: plating precursor powder on the surface of a substrate by using a mechanical plating mode, placing the substrate in a special atmosphere with low oxygen concentration and low pressure for pre-sintering after mechanical plating, preparing a rough plating layer on the surface of the substrate, flattening the rough plating layer by using a stamping flattening mode, finally placing the substrate in a protective atmosphere for heat treatment, and obtaining the aluminum-zinc-magnesium plating layer with high compactness on the surface of the substrate after heat treatment.
Specific preparation parameters of examples 1 to 5 are shown in tables 1 and 2 below.
TABLE 1 specific preparation parameters (I)
TABLE 2 specific preparation parameters (II)
Comparative example 1
The aluminum-plated zinc plate is commercially available, and the aluminum content, the zinc content and the silicon content in the plated layer are respectively 55wt%, 43.4wt% and 1.6 wt%.
Comparative example 2
The aluminum-plated zinc plate is commercially available, and the aluminum content, the zinc content and the silicon content in the plated layer are respectively 55wt%, 43.5wt% and 1.5 wt%.
Comparative example 3
The galvanized sheet is sold in the market, and the coating is pure zinc.
Comparative example 4
A commercially available 5% aluminum-zinc plated sheet has an aluminum content of 5wt% and a zinc content of 95 wt%.
The performance tests of examples 1 to 5 and comparative examples 1 to 4 were performed, and some of the test results are shown in table 3 below.
TABLE 3 Performance test results
In the tables "implementation", i.e. "examples" and "comparison", i.e. "comparative examples", the performance is rated on a scale of 1 to 5, 1 for poor, 2 for slightly poor, 3 for medium, 4 for good and 5 for excellent.
As is apparent from the above table, the Al-Zn-Mg plating layer with high compactness prepared by the invention has outstanding performances in various aspects compared with the plating layers on the prior aluminized zinc plate, galvanized plate and 5% aluminized zinc plate.
Claims (9)
1. An aluminum-zinc-magnesium coating with high compactness is characterized by comprising the following components in percentage by weight: 55wt% of aluminum, 42.5-43 wt% of zinc, 1.0-1.6 wt% of silicon, 0.8-1.2 wt% of magnesium, 0.008-0.012 wt% of nickel, 0.006-0.01 wt% of strontium and 0.002-0.005 wt% of titanium;
the preparation method of the aluminum-zinc-magnesium coating with high compactness comprises the following preparation steps:
1) prefabrication of raw materials: preparing 55wt% of aluminum, 42.5-43 wt% of zinc, 1.0-1.6 wt% of silicon, 0.8-1.2 wt% of magnesium, 0.008-0.012 wt% of nickel, 0.006-0.01 wt% of strontium and 0.002-0.005 wt% of titanium, putting the aluminum and the zinc in a protective atmosphere, smelting into uniform alloy, and then crushing, grinding and blending the uniform alloy with the rest components to obtain pre-alloy powder;
2) substrate pretreatment: carrying out surface treatment on the substrate;
3) preparing a precursor: the pre-alloying powder and the bacterial cellulose powder are mixed according to the mass ratio (5-6): 1, adding the mixed powder into excessive absolute ethyl alcohol to prepare a suspension, carrying out ultrasonic oscillation or stirring and mixing uniformly, filtering and drying after mixing uniformly to obtain precursor powder;
4) preparing a plating layer: plating precursor powder on the surface of a substrate by using a mechanical plating mode, placing the substrate in a special atmosphere with low oxygen concentration and low pressure for pre-burning after mechanical plating, preparing a rough plating layer on the surface of the substrate, flattening the rough plating layer by using a stamping flattening mode, finally placing the substrate in a protective atmosphere for heat treatment, and obtaining an aluminum-zinc-magnesium plating layer with high compactness on the surface of the substrate after heat treatment; the oxygen content in the special atmosphere is 1-5 vol%, the balance is nitrogen or inert gas, and the air pressure in the special atmosphere is 0.3-0.5 atm.
2. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 1, wherein the method comprises the following preparation steps:
1) prefabrication of raw materials: preparing 55wt% of aluminum, 42.5-43 wt% of zinc, 1.0-1.6 wt% of silicon, 0.8-1.2 wt% of magnesium, 0.008-0.012 wt% of nickel, 0.006-0.01 wt% of strontium and 0.002-0.005 wt% of titanium, putting the aluminum and the zinc in a protective atmosphere, smelting into uniform alloy, and then crushing, grinding and blending the uniform alloy with the rest components to obtain pre-alloy powder;
2) substrate pretreatment: carrying out surface treatment on the substrate;
3) preparing a precursor: the pre-alloying powder and the bacterial cellulose powder are mixed according to the mass ratio (5-6): 1, adding the mixed powder into excessive absolute ethyl alcohol to prepare a suspension, carrying out ultrasonic oscillation or stirring and mixing uniformly, filtering and drying after mixing uniformly to obtain precursor powder;
4) preparing a plating layer: plating precursor powder on the surface of a substrate by using a mechanical plating mode, placing the substrate in a special atmosphere with low oxygen concentration and low pressure for pre-burning after mechanical plating, preparing a rough plating layer on the surface of the substrate, flattening the rough plating layer by using a stamping flattening mode, finally placing the substrate in a protective atmosphere for heat treatment, and obtaining an aluminum-zinc-magnesium plating layer with high compactness on the surface of the substrate after heat treatment; the oxygen content in the special atmosphere is 1-5 vol%, the balance is nitrogen or inert gas, and the air pressure in the special atmosphere is 0.3-0.5 atm.
3. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 2, wherein the grain diameter of the prealloyed powder prepared in the step 1) is 1-5 μm.
4. The method for preparing an aluminum-zinc-magnesium coating with high compactness according to claim 2, wherein the surface treatment of step 2) comprises rust removal, oil removal and grinding.
5. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 2, wherein the bacterial cellulose powder used in the step 3) has a particle size of 5-20 μm and a specific surface area of 3-12 m2/g。
6. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 2 or 5, wherein the particle size of the precursor powder prepared in the step 3) is 15-50 μm.
7. The preparation method of the aluminum-zinc-magnesium coating with high compactness according to claim 2, characterized in that the pre-sintering temperature in the step 4) is 360-450 ℃, and the pre-sintering time is 30-90 min.
8. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 2, wherein the protective atmosphere in the step 4) is nitrogen atmosphere or inert gas atmosphere.
9. The method for preparing the aluminum-zinc-magnesium coating with high compactness according to claim 2, wherein the heat treatment temperature in the step 4) is 480-550 ℃, and the heat treatment time is 2-4 h.
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| WO2011127480A1 (en) * | 2010-04-09 | 2011-10-13 | Advanced Lighting Technologies, Inc. | Mechanically plated pellets and method of manufacture |
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| US5354579A (en) * | 1992-02-14 | 1994-10-11 | Dowa Iron Powder Co., Ltd. | Mechanical plating method for forming a zinc alloy film by ejecting heat treated powder |
| CN103045981A (en) * | 2013-01-29 | 2013-04-17 | 云南科力新材料有限公司 | Hot-dip aluminum and zinc alloy containing rare earth and magnesium and preparation method thereof |
| CN104955975A (en) * | 2013-01-31 | 2015-09-30 | Jfe钢板株式会社 | HOT-DIP Al-Zn GALVANIZED STEEL PLATE AND METHOD FOR PRODUCING SAME |
| KR20150120680A (en) * | 2014-04-18 | 2015-10-28 | (주) 동방메카니칼 | Mechanical Plating Method |
| CN107513710A (en) * | 2017-09-12 | 2017-12-26 | 江苏万达特种轴承有限公司 | A kind of mechanical surface galvanized method |
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