CN112029394B - Composition for forming magnesium-lithium alloy surface anticorrosive coating system and preparation method of anticorrosive coating system - Google Patents
Composition for forming magnesium-lithium alloy surface anticorrosive coating system and preparation method of anticorrosive coating system Download PDFInfo
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Abstract
The invention provides a composition for forming a magnesium-lithium alloy surface anticorrosive coating system and a preparation method of the anticorrosive coating system, wherein the composition comprises an anticorrosive primer and a sealing varnish, and the anticorrosive primer is prepared from the following raw materials in parts by mass: 70-100 parts of high-density toughness resin, 1-25 parts of lithium salt inorganic matter and 0-15 parts of sheet shielding material; the sealing varnish comprises high-density resin; the anti-corrosion primer is used for forming an anti-corrosion primer layer on the surface of the magnesium-lithium alloy, and the sealing varnish is used for forming a sealing varnish layer on the surface of the anti-corrosion primer layer; when the anticorrosive coating system is prepared, an anticorrosive primer layer is formed on the surface of the magnesium-lithium alloy, and then a closed varnish layer is formed. The composition and the coating system preparation method have excellent corrosion resistance, achieve the corrosion resistance effect of enabling the magnesium-lithium alloy to resist neutral salt fog for 1000 hours, can be used for corrosion resistance of surfaces of aircrafts such as rocket ships and planes adopting light magnesium-lithium alloy, improve the environmental adaptability of the aircrafts, and have potential wide application prospects in the civil field.
Description
Technical Field
The invention belongs to the field of anticorrosive coatings, and particularly relates to a composition for forming a magnesium-lithium alloy surface anticorrosive coating system and a preparation method of the anticorrosive coating system.
Background
In order to meet the requirements of light weight, high use effect, quick response and the like of the spacecraft, a novel structural material which is lighter, low in cost and short in manufacturing period is urgently needed. The new generation magnesium-lithium (Mg-Li) alloy has excellent specific stiffness, specific strength and electromagnetic shielding performance, can greatly reduce the weight of a spacecraft relative to the traditional aluminum alloy while meeting the technical indexes, and has wide application prospect. However, due to the specific mechanical property and internal organization structure of the magnesium alloy, the Mg-Li alloy also has the disadvantages of insufficient corrosion resistance, mechanical property, space alternation resistance and the like of the traditional magnesium alloy, and the defects also limit the application of the Mg-Li alloy in the aerospace field, thereby influencing the aspects of structure optimization and upgrading, use efficiency improvement, large-scale use in wartime, control on battlefield situation and the like of a new generation of spacecraft to a certain extent.
Micro-arc oxidation, organic coating, electrochemical plating, chemical oxidation, vapor deposition, laser treatment and other process treatments are common protection measures for the surface of the magnesium-lithium alloy at present, and researchers all carry out a large amount of related researches. Chemical oxidation is an early surface treatment method, has a good application effect on materials such as aluminum alloy and the like, has a good protection effect in the traditional methods including chromate conversion, phosphate conversion and stannate conversion, but is not beneficial to environmental protection, and has a protection effect to be further improved in the novel chemical oxidation including phytic acid conversion and the like. Chemical nickel plating is a common surface protection means, has the advantages of simple and convenient operation without an external power supply and the like when being applied to the surface of the traditional metal, but due to the special structure of Mg-Li alloy, galvanic corrosion is easy to occur in the solution to cause the integral reduction of the performance of the film layer, so that the process difficulty is increased, and the cost is increased. Vapor deposition and laser treatment are surface protection means developed in recent years, and a high-performance surface film layer can be obtained, but the requirements on equipment environment and the like are extremely high, and the application range is limited. Micro-arc oxidation is the most common magnesium alloy surface protection means at present, has wide applicability, but has the characteristic of a porous structure to limit the anticorrosion effect. The organic coating is the cheapest means for metal protection, but the organic coating of the gold oil loses the due effect due to the special corrosion characteristic of the magnesium alloy. Two metal elements in the magnesium-lithium alloy have extremely high activity and are more easily corroded compared with other magnesium alloys, so that higher requirements on protection means are put forward. At present, an organic coating protective material with good corrosion resistance on the surface of the magnesium-lithium alloy is lacked.
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research and provides a composition for forming a magnesium-lithium alloy surface anticorrosive coating system and a preparation method of the anticorrosive coating system, wherein the composition is used for the magnesium-lithium alloy surface and has excellent anticorrosive performance; the anticorrosive coating system has simple preparation process, is used for corrosion prevention of the surfaces of aircrafts such as rocket ships and planes adopting light magnesium-lithium alloy, can effectively improve the environmental adaptability, and has potential wide application prospect in the civil field, thereby completing the invention.
The technical scheme provided by the invention is as follows:
in a first aspect, a composition for forming an anticorrosion coating system for a magnesium-lithium alloy surface comprises an anticorrosion primer and a sealing varnish, wherein the anticorrosion primer is prepared from the following raw materials in parts by mass:
70-100 parts of high-density toughness resin;
1-25 parts of lithium salt inorganic substance;
0-15 parts of sheet shielding material;
the sealing varnish comprises high-density resin;
the anti-corrosion primer is used for forming an anti-corrosion primer layer on the surface of the magnesium-lithium alloy, and the sealing varnish is used for forming a sealing varnish layer on the surface of the anti-corrosion primer layer.
In a second aspect, a method for preparing a magnesium-lithium alloy surface anticorrosive coating system, which is prepared by using the composition for forming the magnesium-lithium alloy surface anticorrosive coating system according to the first aspect, comprises the following steps:
step 1, stirring and mixing the components in the anticorrosive primer, and homogenizing to form the anticorrosive primer;
step 2, spraying an anticorrosive primer on the surface of the magnesium-lithium alloy subjected to micro-arc oxidation, and curing to form an anticorrosive primer layer;
and 3, spraying a sealing varnish on the surface of the cured anticorrosive primer layer, and curing to form a sealing varnish layer.
According to the composition for forming the magnesium-lithium alloy surface anticorrosive coating system and the preparation method of the anticorrosive coating system, the following beneficial effects are achieved:
the invention provides a composition for forming a magnesium-lithium alloy surface anticorrosive coating system and a preparation method of the anticorrosive coating system, the composition consists of an anticorrosive primer and a sealing varnish, the anticorrosive primer takes lithium salt as an anticorrosive functional filler, takes a sheet material as a physical shielding filler, takes high-density tough resin as a coating film forming material, the adjustment of the performance of the anticorrosive primer is realized by adjusting the contents of the functional filler and the physical shielding filler in the anticorrosive primer, the filler is uniformly dispersed in the high-density tough resin by adopting homogenization process means such as ball milling, sand milling, high-speed dispersion and the like, and a dense cross-linked network structure effect formed by the sealing varnish is superposed to realize the anticorrosive performance of the coating system, so that the anticorrosive effect that the magnesium-lithium alloy resists neutral salt fog for 1000 hours and has the humidity and heat resistance of more than or equal to 10 days is achieved. The magnesium-lithium alloy surface anticorrosive coating system is simple in preparation process, can be cured at room temperature or cured at an accelerated speed by heating, is excellent in anticorrosive performance, can be used for corrosion prevention of surfaces of aircrafts such as rocket ships and planes which adopt light magnesium-lithium alloy, improves environmental adaptability of aircrafts, and has potential wide application prospects in the civil field.
Drawings
FIG. 1 is a flow chart of the preparation of a magnesium-lithium alloy surface anticorrosive coating system.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
According to a first aspect of the invention, a composition for forming an anticorrosion coating system for a magnesium-lithium alloy surface is provided, and the composition comprises an anticorrosion primer and a seal varnish, wherein the anticorrosion primer is prepared from the following raw materials in parts by mass:
70-100 parts of high-density toughness resin, preferably 80-95 parts;
1-25 parts of lithium salt inorganic substance, preferably 5-20 parts;
0-15 parts of sheet shielding material;
the sealing varnish comprises high-density resin;
the anti-corrosion primer is used for forming an anti-corrosion primer layer on the surface of the magnesium-lithium alloy, the sealing varnish is used for forming a sealing varnish layer on the surface of the anti-corrosion primer layer, the anti-corrosion primer layer aims to inhibit the reaction of lithium metal in the magnesium-lithium alloy converting towards the direction of lithium ions by using lithium ions in lithium salt inorganic matters, and the sealing varnish layer aims to block corrosive media on the outer surface by using the compactness of the sealing varnish layer.
In the invention, the high-density tough resin in the anti-corrosion primer is a resin with higher crosslinking density and certain toughness, the high crosslinking density can provide excellent corrosion medium shielding effect, and the certain toughness can ensure that a paint film is not cracked after the high-density tough resin is mixed with a certain amount of filler, and the high-density tough resin is selected from any one or the combination of epoxy resin, acrylic polyurethane resin or fluorocarbon polyurethane resin; wherein the content of the first and second substances,
the epoxy resin may be selected from E51 epoxy resin, E20 epoxy resin, E44 epoxy resin, and the like;
the acrylic urethane resin may be selected from FX-9003 hydroxy acrylic urethane, AC1010-c hydroxy acrylic urethane, 962 acrylic urethane, etc.;
the fluorocarbon polyurethane resin can be selected from A833 fluorocarbon modified hydroxy acrylic resin polyurethane, DS302 normal temperature curing crosslinking fluorocarbon polyurethane, GK-570 fluorocarbon polyurethane and the like.
In the invention, the high-density resin in the sealing varnish is resin with higher crosslinking density, can play a better role in preventing water vapor permeation, and is selected from any one or the combination of epoxy resin, acrylic polyurethane resin and fluorocarbon polyurethane resin; wherein the content of the first and second substances,
the epoxy resin may be selected from E51 epoxy resin, E20 epoxy resin, E44 epoxy resin, and the like;
the acrylic urethane resin may be selected from FX-9003 hydroxy acrylic urethane, AC1010-c hydroxy acrylic urethane, 962 acrylic urethane, etc.;
the fluorocarbon polyurethane resin can be selected from A833 fluorocarbon modified hydroxy acrylic resin polyurethane, DS302 normal temperature curing crosslinking fluorocarbon polyurethane, GK-570 fluorocarbon polyurethane and the like.
In the present invention, the lithium salt inorganic material is a corrosion inhibiting filler, and is selected from one or more lithium salts such as lithium carbonate, lithium nitrate, lithium chloride, lithium sulfate, and lithium phosphate, and preferably lithium carbonate or lithium sulfate.
The inventor of the invention has conducted a great deal of research, and finds that when the high-density tough resin is used in combination with the lithium salt inorganic substance, the physical shielding performance of the high-density tough resin can be used to prevent a corrosion medium from permeating into the surface of the magnesium-lithium alloy, and meanwhile, when the physical shielding performance is locally ineffective, and the corrosion medium causes corrosion of the magnesium-lithium alloy, the lithium salt inorganic substance can inhibit the ionization corrosion behavior of lithium metal, thereby playing a role in corrosion prevention.
The present inventors have found that the amount of the high-density and tough resin and the lithium salt inorganic substance used is required to a certain extent, and if the amount of the lithium salt inorganic substance is too small and is less than the above range, it is difficult to sufficiently suppress the conversion reaction of the lithium metal into lithium ions when the lithium metal undergoes ionization corrosion; if the dosage of the lithium salt inorganic substance is too high and is higher than the dosage range, the physical shielding effectiveness of the paint film is affected, and the effect of preventing corrosive media from permeating into the surface of the magnesium-lithium alloy is difficult to achieve.
In the invention, the flaky shielding material in the anti-corrosion primer is used as an auxiliary filler with an anti-corrosion function, is selected from one or more of flaky materials such as graphene, molybdenum disulfide, sericite, montmorillonite and kaolin, and is preferably graphene, molybdenum disulfide or sericite.
The inventor conducts a great deal of research, and finds that the addition of the flaky material can significantly increase the penetration distance of the corrosive medium to the surface of the base material, thereby achieving enhanced physical shielding effectiveness. If the dosage of the sheet shielding material is too small and is lower than the dosage range, a continuous physical shielding structure is difficult to form in a paint film, and the physical shielding effect of obviously increasing the penetration distance of a corrosive medium to the surface of the base material cannot be achieved; if the dosage of the flaky shielding material is too high and is higher than the dosage range, the physical shielding efficiency of the paint film body is affected, and the function of preventing corrosive media from permeating the surface of the magnesium-lithium alloy is difficult to achieve.
In a preferred embodiment, the maximum diameter of the graphene, molybdenum disulfide and sericite sheet layer is 10 to 60 μm. The inventor finds that the size of the sheet layer has an influence on the anticorrosion effect, and if the maximum diameter of the sheet layer is lower than the range, the lapping effect of the sheet structure is weakened; if the maximum diameter of the sheet is larger than the above range, the appearance quality of the paint film is affected.
In the invention, the anticorrosion primer also comprises a solvent I for promoting the dispersion of the filler in the resin and adjusting the viscosity of the coating. The solvent I is selected from any one or combination of butyl acetate, ethyl acetate, xylene, propylene glycol monomethyl ether acetate and n-butanol, and is preferably butyl acetate or ethyl acetate.
The content of the solvent I in the anticorrosion primer is 20-50 wt%. If the dosage of the solvent I is too small and is lower than the dosage range, the viscosity of the coating is too high, and normal construction cannot be carried out; if the dosage of the solvent I is too high and is higher than the dosage range, the viscosity of the coating is too low, the coating is easy to sag in the construction process, and the pollution to the environment is increased.
In the invention, the sealing varnish also comprises a solvent II for adjusting the construction viscosity. The solvent II is selected from any one or combination of butyl acetate, ethyl acetate, xylene, propylene glycol monomethyl ether acetate and n-butanol, and is preferably butyl acetate or ethyl acetate.
The content of the solvent II in the sealing varnish is 20 to 80 weight percent. If the dosage of the solvent II is too small and is lower than the dosage range, the viscosity of the coating is too high, and normal construction cannot be carried out; if the dosage of the solvent II is too high and is higher than the dosage range, the viscosity of the coating is too low, the coating is easy to sag in the construction process, and the pollution to the environment is increased.
In the invention, in order to effectively play a role of anticorrosion, the thickness of the anticorrosion primer layer on the surface of the magnesium-lithium alloy is 20-60 μm; the thickness of the sealing varnish layer on the surface of the anti-corrosion primer layer is 20-60 mu m.
In the invention, the neutral salt spray resistance of the magnesium-lithium alloy surface anticorrosive coating system is more than or equal to 1000 h; the moisture and heat resistance of the magnesium-lithium alloy surface anticorrosive coating system is more than or equal to 10 days.
According to a second aspect of the present invention, there is provided a method for preparing a magnesium-lithium alloy surface anticorrosive coating system, which is formed by using the above composition for forming a magnesium-lithium alloy surface anticorrosive coating system, as shown in fig. 1, and comprises the following steps:
step 1, stirring and mixing the components in the anticorrosive primer, homogenizing for 2-7 h to form the anticorrosive primer; homogenizing means including but not limited to ball milling, sanding, high speed dispersion, etc.;
step 2, spraying an anticorrosive primer on the surface of the magnesium-lithium alloy subjected to micro-arc oxidation, and curing to form an anticorrosive primer layer;
and 3, spraying a sealing varnish on the surface of the cured anticorrosive primer layer, and curing to form a sealing varnish layer.
In a preferred embodiment, if a solvent is needed to adjust the fluidity of the anti-corrosion primer coating or the sealing clear coat coating, a solvent I is also added into the anti-corrosion primer coating; and a solvent II is also added into the closed varnish layer coating. The selection and amount of the solvent I and the solvent II are as described above with reference to the first aspect.
In a preferred embodiment, the components, selection of species and amounts of the corrosion inhibiting primer are as described above with reference to the first aspect; the components, selection of species and amounts of the anti-corrosion primer layer are as described above with reference to the first aspect.
In a preferred embodiment, in step 2, before spraying the anticorrosive primer, the surface of the lithium alloy is subjected to micro-arc oxidation pretreatment, and the pretreatment method is any method in the prior art, such as performing micro-arc oxidation on magnesium-lithium alloys with different lithium contents for 2-120 min in a composite electrolyte system of sodium polyphosphate, sodium silicate, sodium hexametaphosphate and sodium hydroxide by using a direct current/direct current pulse/alternating current pulse multiplex power supply, so as to generate a ceramic oxide film with a thickness of 10-100 μm in situ on the surface of the magnesium-lithium alloy.
In a preferred embodiment, in the step 2, the thickness of the anticorrosion primer layer on the surface of the magnesium-lithium alloy is 20-60 μm; in the step 3, the thickness of the closed varnish layer on the surface of the magnesium-lithium alloy is 20-60 mu m.
Examples
The raw material sources of the examples and the comparative examples in the invention are as follows: lithium nitrate (national medicine, AR); lithium chloride (national medicine, AR); lithium sulfate (national drug, AR); lithium carbonate (national medicine, AR); GK570 fluorocarbon urethane resin (DAIKIN); e51 epoxy resin (commercially available); e44 epoxy (commercially available), 962 acrylic urethane (jiangsu sammu); sericite (chevrili), with a lamella maximum diameter of 20 μm; graphene (national medicine, 97%), with a maximum diameter of 20 μm; molybdenum disulfide (national medicine, 99%), with a maximum diameter of the lamella of 60 μm; butyl acetate (national medicine, AR); ethyl acetate (national medicine, AR).
Example 1
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 5g of lithium nitrate, 80g of GK570 fluorocarbon polyurethane, 2g of sericite and 22g of butyl acetate, and after uniformly stirring and mixing, performing ball milling and mixing for 4 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 60 mu m.
After the anti-corrosion primer is dried and cured, continuously spraying GK570 fluorocarbon polyurethane varnish on the surface of the anti-corrosion primer by adopting an air spraying process, and carrying out sealing treatment on the surface, wherein the thickness of the sealing varnish layer is 20 microns. The GK570 fluorocarbon polyurethane varnish contains 20 wt% of butyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films slightly change color, and the phenomena of pulverization, cracking, bubbling, mildew growth, peeling, corrosion and the like do not occur.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Example 2
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 5g of lithium chloride, 95g of E44 epoxy resin, 15g of sericite and 115g of ethyl acetate, and after uniformly stirring and mixing, performing ball milling and mixing for 7 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 20 microns.
And after the anti-corrosion primer is dried and cured, continuously spraying E51 epoxy resin varnish on the surface of the anti-corrosion primer by adopting an air spraying process, and sealing the surface, wherein the thickness of the sealing varnish layer is 20 microns. The E51 epoxy resin varnish contained 80 wt%.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films slightly change color, and the phenomena of pulverization, cracking, bubbling, mildew growth, peeling, corrosion and the like do not occur.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Example 3
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 20g of lithium sulfate, 80g of 962 polyurethane acrylate, 0.5g of graphene, 50g of butyl acetate and 50g of ethyl acetate, uniformly dispersing, stirring and mixing at a high speed, and then grinding and mixing for 2 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 20 microns.
After the anticorrosion primer is dried and cured, 962 acrylic polyurethane varnish is continuously sprayed on the surface of the anticorrosion primer by adopting an air spraying process, and the surface is subjected to sealing treatment, wherein the thickness of the sealing varnish layer is 60 mu m. 962 polyurethane acrylic varnish contains 50 wt% of butyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films slightly change color, and the phenomena of pulverization, cracking, bubbling, mildew growth, peeling, corrosion and the like do not occur.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Example 4
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 20g of lithium carbonate, 95g of E51 epoxy resin and 10g of molybdenum disulfide; 30g of butyl acetate and 30g of ethyl acetate, stirring at a high speed, uniformly mixing, and performing ball milling and grinding for 5 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 60 mu m.
After the anti-corrosion primer is dried and cured, continuously spraying GK570 fluorocarbon polyurethane varnish on the surface of the anti-corrosion primer by adopting an air spraying process, and carrying out sealing treatment on the surface, wherein the thickness of the sealing varnish layer is 60 mu m. The GK570 fluorocarbon polyurethane varnish contains 10 wt% of butyl acetate and 30% of ethyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films slightly change color, and the phenomena of pulverization, cracking, bubbling, mildew growth, peeling, corrosion and the like do not occur.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Example 5
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 10g of lithium carbonate, 90g of GK570 fluorocarbon polyurethane and 30g of butyl acetate, and after uniformly stirring and mixing, performing ball milling and grinding for mixing for 4 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 50 microns.
After the anticorrosion primer is dried and cured, 962 acrylic polyurethane varnish is continuously sprayed on the surface of the anticorrosion primer by adopting an air spraying process, and the surface is subjected to sealing treatment, wherein the thickness of the sealing varnish layer is 50 microns. 962 polyurethane acrylic varnish contains 40 wt% butyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films slightly change color, and the phenomena of pulverization, cracking, bubbling, mildew growth, peeling, corrosion and the like do not occur.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Comparative example
Comparative example 1
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 90g of GK570 fluorocarbon polyurethane and 30g of butyl acetate, and uniformly stirring and mixing, and dispersing at a high speed for 2 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 50 microns.
After the anticorrosion primer is dried and cured, 962 acrylic polyurethane varnish is continuously sprayed on the surface of the anticorrosion primer by adopting an air spraying process, and the surface is subjected to sealing treatment, wherein the thickness of the sealing varnish layer is 50 microns. 962 polyurethane acrylic varnish contains 40 wt% butyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films are slightly discolored and locally bubble phenomenon occurs after the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Comparative example 2
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 0.5g of lithium carbonate, 95g of E51 epoxy resin and 10g of molybdenum disulfide; 30g of butyl acetate and 30g of ethyl acetate, stirring at a high speed, uniformly mixing, and performing ball milling and grinding for 5 hours to form the anticorrosive primer. And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 60 mu m.
After the anti-corrosion primer is dried and cured, continuously spraying GK570 fluorocarbon polyurethane varnish on the surface of the anti-corrosion primer by adopting an air spraying process, and carrying out sealing treatment on the surface, wherein the thickness of the sealing varnish layer is 60 mu m. The GK570 fluorocarbon polyurethane varnish contains 10 wt% of butyl acetate and 30% of ethyl acetate. After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films are slightly discolored and locally bubble phenomenon occurs after the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Comparative example 3
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 29g of lithium sulfate, 80g of 962 polyurethane acrylate, 0.5g of graphene, 50g of butyl acetate and 50g of ethyl acetate, uniformly dispersing, stirring and mixing at a high speed, and then grinding and mixing for 2 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 20 microns.
After the anticorrosion primer is dried and cured, 962 acrylic polyurethane varnish is continuously sprayed on the surface of the anticorrosion primer by adopting an air spraying process, and the surface is subjected to sealing treatment, wherein the thickness of the sealing varnish layer is 60 mu m. 962 polyurethane acrylic varnish contains 50 wt% of butyl acetate.
After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films are slightly discolored and locally bubble phenomenon occurs after the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Comparative example 4
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 5g of lithium chloride, 95g of E44 epoxy resin, 21g of sericite and 115g of ethyl acetate, and after uniformly stirring and mixing, performing ball milling and mixing for 7 hours to form the anticorrosive primer.
And continuously spraying the surface of the magnesium-lithium alloy base material subjected to micro-arc oxidation by adopting an air spraying process to prepare the anti-corrosion primer, wherein the thickness of the anti-corrosion primer is 20 microns.
And after the anti-corrosion primer is dried and cured, continuously spraying E51 epoxy resin varnish on the surface of the anti-corrosion primer by adopting an air spraying process, and sealing the surface, wherein the thickness of the sealing varnish layer is 20 microns. The E51 epoxy resin varnish contained 80 wt%. After the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours, the surfaces of three sample paint films are slightly discolored and locally bubble phenomenon occurs after the magnesium-lithium alloy surface anticorrosive coating system is continuously sprayed with salt mist for 1000 hours.
In the aspect of humidity resistance and heat resistance, after the magnesium-lithium alloy surface anticorrosive coating system is subjected to 10 cycles according to the moisture-heat test standard of GJB150.9A-2009, the surfaces of three sample paint films are slightly discolored, and the phenomena of pulverization, cracking, foaming, mildew growing, peeling, corrosion and the like are avoided.
Comparative example 5
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 10g of lithium carbonate, 90g of GK570 fluorocarbon polyurethane and 105g of butyl acetate, and after uniformly stirring and mixing, performing ball milling and grinding for mixing for 4 hours to form the anticorrosive primer. The viscosity of the anti-corrosion primer is low.
The air spraying process is adopted to continuously spray the surface of the magnesium-lithium alloy base material after micro-arc oxidation to prepare the anti-corrosion primer, and during spraying, the sagging phenomenon is easy to occur due to low viscosity of the coating, and the surface drying time is prolonged due to more solvent, so that the time interval of each spraying is prolonged.
Comparative example 6
The magnesium-lithium alloy surface anticorrosion primer comprises the following raw materials in parts by weight: 10g of lithium carbonate, 90g of GK570 fluorocarbon polyurethane and 24g of butyl acetate, and after uniformly stirring and mixing, performing ball milling and grinding for mixing for 4 hours to form the anticorrosive primer. The viscosity of the anti-corrosion primer is higher.
The air spraying process is adopted to continuously spray the surface of the magnesium-lithium alloy base material after micro-arc oxidation to prepare the anti-corrosion primer, and when the anti-corrosion primer is sprayed, the phenomenon that the coating is difficult to normally spray occurs due to high viscosity of the coating, and the surface of a paint film is difficult to level.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. The composition for forming the magnesium-lithium alloy surface anticorrosive coating system is characterized by comprising an anticorrosive primer and a sealing varnish, wherein the anticorrosive primer is prepared from the following raw materials in parts by mass:
70-100 parts of high-density toughness resin;
1-25 parts of lithium salt inorganic substance;
0.5-15 parts of sheet shielding material;
the high-density toughness resin in the anti-corrosion primer is selected from any one or the combination of epoxy resin, acrylic polyurethane resin or fluorocarbon polyurethane resin; the lithium salt inorganic substance is selected from one or more of lithium carbonate, lithium nitrate, lithium chloride, lithium sulfate or lithium phosphate;
the sealing varnish comprises high-density resin selected from any one or combination of epoxy resin, acrylic polyurethane resin or fluorocarbon polyurethane resin;
the anti-corrosion primer is used for forming an anti-corrosion primer layer on the surface of the magnesium-lithium alloy, and the sealing varnish is used for forming a sealing varnish layer on the surface of the anti-corrosion primer layer.
2. The composition according to claim 1, wherein the anticorrosion primer is prepared from the following raw materials in parts by mass:
80-95 parts of high-density toughness resin;
5-20 parts of lithium salt inorganic substance;
0.5-15 parts of sheet shielding material.
3. The composition as claimed in claim 1, wherein the sheet-like shielding material is selected from one or more of graphene, molybdenum disulfide, sericite, montmorillonite or kaolin.
4. The composition as claimed in claim 1, wherein the anti-corrosive primer further comprises a solvent I, wherein the solvent I is selected from any one or combination of butyl acetate, ethyl acetate, xylene, propylene glycol methyl ether acetate or n-butanol;
the content of the solvent I in the anticorrosion primer is 20-50 wt%.
5. The composition as claimed in claim 1, wherein the blocking varnish further comprises a solvent II, and the solvent II is selected from any one or a combination of butyl acetate, ethyl acetate, xylene, propylene glycol methyl ether acetate or n-butanol;
the content of the solvent II in the sealing varnish is 20 to 80 weight percent.
6. A method for preparing a magnesium-lithium alloy surface anticorrosive coating system, which is characterized by being prepared by using the composition for forming the magnesium-lithium alloy surface anticorrosive coating system according to any one of claims 1 to 5, and comprising the following steps:
step 1, stirring and mixing the components in the anticorrosive primer, and homogenizing to form the anticorrosive primer;
step 2, spraying an anticorrosive primer on the surface of the magnesium-lithium alloy subjected to micro-arc oxidation, and curing to form an anticorrosive primer layer;
and 3, spraying a sealing varnish on the surface of the anticorrosive primer layer, and curing to form a sealing varnish layer.
7. The preparation method according to claim 6, wherein the thickness of the anticorrosive primer layer on the surface of the magnesium-lithium alloy is 20-60 μm;
the thickness of the sealing varnish layer on the surface of the anti-corrosion primer layer is 20-60 mu m.
8. The preparation method according to claim 7, wherein the neutral salt spray resistance of the formed magnesium-lithium alloy surface anticorrosive coating system is not less than 1000 h; the formed magnesium-lithium alloy surface anticorrosive coating system has the humidity and heat resistance of more than or equal to 10 days.
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| CN114713481A (en) * | 2021-01-04 | 2022-07-08 | 波音公司 | Corrosion-resistant magnesium alloy with multi-stage protective coating and preparation method thereof |
| CN113930824B (en) * | 2021-11-04 | 2022-09-13 | 华南理工大学 | Sericite-containing micro-arc oxidation corrosion-resistant wear-resistant ceramic coating and preparation method thereof |
| CN116355490A (en) * | 2021-12-28 | 2023-06-30 | 广东华润涂料有限公司 | Chromium-free anticorrosive coating composition and articles made therefrom |
| CN116355489A (en) * | 2021-12-28 | 2023-06-30 | 广东华润涂料有限公司 | Chromium-free anticorrosive coating composition and articles made therefrom |
| CN114752295B (en) * | 2022-04-24 | 2022-12-02 | 苏州佩琦材料科技有限公司 | Polyurethane high-speed rail car body anticorrosive paint and preparation method thereof |
| CN115572519B (en) * | 2022-11-04 | 2023-11-10 | 卡秀万辉(无锡)高新材料有限公司 | Low-VOC (volatile organic compound) coating applied to magnesium-lithium film and preparation method thereof |
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