CN112221913A - High-corrosion-resistance aluminum profile and processing technology thereof - Google Patents
High-corrosion-resistance aluminum profile and processing technology thereof Download PDFInfo
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- 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
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- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- 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
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- B05D7/26—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials synthetic lacquers or varnishes
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- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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Abstract
The invention relates to the technical field of aluminum profile production, in particular to a high-corrosion-resistance aluminum profile which comprises a profile body, a transition layer, a primer layer, a finish paint layer and a curing layer, wherein the outer surface of the profile body is treated by a chemical method to form the transition layer, and the invention also relates to a processing technology of the high-corrosion-resistance aluminum profile, which comprises the following steps: step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; and step nine, curing and spraying. The invention achieves the purpose of improving the self corrosion resistance of the aluminum profile, has good chemical medium resistance on the surface, enables the aluminum profile to be firm and durable, has rich and colorful colors, improves the decorative effect, greatly reduces the coating times, saves the working time, and has the characteristics of simple process, low production cost and suitability for large-scale production.
Description
Technical Field
The invention relates to the technical field of aluminum profile production, in particular to a high-corrosion-resistance aluminum profile and a processing technology thereof.
Background
Aluminum profiles are the most widely used non-ferrous structural materials in industry and have found a large number of applications in the aerospace, automotive, mechanical, marine and chemical industries. The rapid development of industrial economy and the increasing demand for structural parts of aluminum profiles are now the most used materials.
Although the traditional high-strength aluminum section has higher strength, the application of the traditional high-strength aluminum section is limited by the lower fracture toughness and stress corrosion resistance. The traditional casting, extrusion and heat treatment process is adopted, although the strength requirement of the aluminum profile can be met, the stress fatigue and stress corrosion resistance can not fully meet the use requirements of the aluminum profiles in other fields, and the aluminum profile is seriously damaged due to the corrosion of external acidic or alkaline substances, so that the service life of the aluminum profile is greatly shortened.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the aluminum profile with high corrosion resistance and the processing technology thereof, which achieve the purpose of improving the self corrosion resistance of the aluminum profile, have good chemical medium resistance on the surface, enable the aluminum profile to be firm and durable, have rich and colorful colors, improve the decorative effect, greatly reduce the coating times, save the working time, and have the characteristics of simple technology, low production cost and suitability for large-scale production.
(II) technical scheme
In order to realize the technical problem, the invention provides the following technical scheme: the utility model provides a high corrosion resistance's aluminium alloy, includes section bar body, transition layer, priming paint layer, finish paint layer and cured layer, the surface of section bar body is handled through chemical method and is formed the transition layer, the even coating of priming paint layer is on the surface on transition layer, the even coating of finish paint layer is on the surface of priming paint layer, the even coating of cured layer is on the surface of finish paint layer.
Further, the section bar body comprises a central part, a limiting groove and an isolation bridge cut-off, the central part is located at the transverse central position of the section bar body, the central part is a hollow circular channel, and the central part and the section bar body are arranged in an integrally formed structure.
Furthermore, the profile body is provided with four limiting grooves, the four limiting grooves are respectively located on the periphery of the outer surface of the central portion, the isolation broken bridge is slidably clamped inside the limiting grooves and made of silicon sulfide rubber, and the isolation broken bridge is matched with the limiting grooves in shape and size.
Further, the transition layer is a film formed of chromium hydroxide, a precipitated heavy metal phosphate film, a silane-treated film, or a manganese oxide film formed of permanganic acid, preferably a silane-treated film.
Further, the primer layer is composed of an epoxy resin coated chromate, preferably silver chromate, and a non-chromate pigment, and has a thickness of 15 to 25 μm.
Further, the surface paint layer is an electrostatic powder spraying layer, the cured layer is composed of polyurethane and epoxy resin, and the thickness of the cured layer is 55-80 μm.
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; step nine, curing and spraying;
in the first step, raw materials required by the aluminum profile are put into a smelting furnace to be smelted, and the internal temperature of the smelting furnace is controlled within the range of 700 ℃ and 800 ℃;
in the second step, after the smelting is finished, carrying out primary refining in a smelting furnace, transferring to a standing furnace after the primary refining for secondary refining, then introducing argon gas for refining degassing, and then standing for 1.5-2h to form refined liquid;
in the third step, the aluminum profile in the molten state is cooled to 550-580 ℃, then cast into a mold, cooled to the normal temperature by adopting a water cooling mode, and kept stand for 15-20min to obtain the aluminum profile same as the mold;
in the fourth step, the formed aluminum profile is subjected to aging treatment at the temperature of 100 ℃ and 150 ℃, kept for 15-20h and then cooled to the normal temperature;
in the fifth step, the surface of the aluminum profile is treated, burrs and redundant parts on the outer surface are removed, and then the surface is dedusted to keep a clean state;
in the sixth step, the preparation of the transition layer is carried out by adopting a chemical reaction, and is a film formed by chromic hydroxide, a precipitated heavy metal phosphate film, a silane-treated film or a manganese oxide film formed by permanganate;
in the seventh step, 20-32 parts of epoxy resin coated silver chromate, 30-38 parts of non-chromate pigment and 15-20 parts of distilled water are mixed to form a primer coating, the silver chromate can play a role of a corrosion inhibitor, the primer coating is uniformly sprayed on the outer surface of the aluminum profile by a spraying machine, the thickness of the coating is 15-25 mu m, then a drying box is used for drying, the temperature inside the drying box is 150-180 ℃, and the drying time is 2.5-3 h;
in the step eight, spraying powder coating on the outer surface of the aluminum profile by using electrostatic powder spraying equipment, wherein under the electrostatic action, powder can be uniformly adsorbed on the surface of the aluminum profile to form a powdery coating, and the powdery coating is baked at high temperature, leveled and cured to form a final finish coating;
in the ninth step, a coating agent formed by mixing 35-42 parts of polyurethane, 25-36 parts of epoxy resin and 40-45 parts of distilled water is uniformly sprayed on the outer surface of the aluminum profile through a spraying machine, the spraying thickness is 55-80 mu m, then a drying box is used for drying, the temperature inside the drying box is 85-105 ℃, the drying time is 2-5h, and then the aluminum profile with high corrosion resistance is obtained.
Further, in step eight, the aluminum profile enters a spray gun position of the powder spraying room through the conveying chain to prepare spraying operation, the electrostatic generator releases high-voltage static electricity (negative electrode) to a space in the direction of the aluminum profile through an electrode needle of a gun opening of the spray gun, the high-voltage static electricity enables a mixture of powder sprayed out of the gun opening and compressed air and air around the electrode to be ionized (negatively charged), the aluminum profile is grounded (grounding electrode) through the conveying chain through a hanger, so that electric field powder is formed between the spray gun and the aluminum profile and reaches the surface of the aluminum profile under the double pushing of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the aluminum profile by means of electrostatic attraction.
Further, the high-temperature baking leveling curing in the step eight mainly comprises the following steps: and conveying the aluminum profile sprayed with the powder into a drying room at the temperature of 180-200 ℃ through a conveying chain for heating, and preserving the heat for corresponding time of 15-20min to ensure that the powder coating is melted, leveled and cured on the surface of the aluminum profile.
(III) advantageous effects
The invention provides a high-corrosion-resistance aluminum profile and a processing technology thereof, and the aluminum profile has the following beneficial effects:
1. according to the invention, due to the arrangement of the conversion layer and the primer layer, a materialized film is formed on the outer surface of the aluminum profile by adopting a chemical method, so that the metal surface is converted into a more corrosion-resistant surface layer or a matched primer forms a surface which is easier to adhere and has stronger bonding force, the conversion layer has the function of increasing the erection and corrosion resistance between the base material and the primer, and meanwhile, the primer layer has an excellent corrosion resistance function.
2. Due to the arrangement of the finish paint layer, the surface of the aluminum profile has good chemical medium resistance; the coating with the thickness of 50-300 mu m can be obtained by spraying the powder once, so that the coating frequency is greatly reduced, the working time is saved, the dripping phenomenon and the pinhole defect generated in the coating process of the solution type coating are avoided, a better film layer can be obtained, and the aluminum profile product is firm and durable; the color is rich and colorful, and the decorative effect is improved; and the electrostatic powder spraying has higher scientific and technological component content and has wider market prospect than anodic oxidation and electrophoretic coating.
3. According to the invention, due to the arrangement of the curing layer, the spraying of the curing layer mainly plays a role in resisting environment, such as weather, ultraviolet, corrosion, medium corrosion and decoration, and the spraying effect is superior to that of a paint spraying process in the aspects of mechanical strength, adhesive force, corrosion, aging and the like, and simultaneously plays a role in protecting the topcoat layer 4.
4. According to the invention, due to the arrangement of the central part, the limiting groove and the isolating broken bridge, the mechanical strength of the aluminum profile can be improved through the hollow circular channel of the central part, the weight and the material consumption of the aluminum profile are reduced, the isolating broken bridge matched with vulcanized silicone rubber is inserted in the limiting groove to form limiting connection, so that the isolating broken bridge is stably connected with the aluminum profile, and meanwhile, the isolating broken bridge can block the temperature of the aluminum profile, so that the aluminum profile has excellent heat insulation capability, the stability of connection between the aluminum profiles is greatly improved, and the aluminum profile has a simple structure and strong practicability.
Drawings
FIG. 1 is an exploded view of the profile body of the present invention;
fig. 2 is a schematic cross-sectional structure of the profile body of the present invention.
In the figure: 1. a profile body; 2. a transition layer; 3. a primer layer; 4. a finish paint layer; 5. curing the layer; 11. a central portion; 12. a limiting groove; 13. and isolating the broken bridge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a high corrosion resistance's aluminium alloy, includes section bar body 1, transition layer 2, priming paint layer 3, finish paint layer 4 and cured layer 5, and the surface of section bar body 1 is handled through the chemical process and is formed transition layer 2, and 3 even coatings on the surface on transition layer 2 on the priming paint layer, and finish paint layer 4 evenly coats on 3's on the surface on priming paint layer, and 5 even coatings in cured layer are on the surface of finish paint layer 4.
The profile body 1 comprises a central part 11, a limiting groove 12 and an isolation broken bridge 13, wherein the central part 11 is positioned at the transverse central position of the profile body 1, the central part 11 is a hollow circular channel, the central part 11 and the profile body are arranged in an integrally formed structure, the profile body 1 is provided with the limiting groove 12, the number of the limiting grooves 12 is four, the four limiting grooves 12 are respectively positioned at the periphery of the outer surface of the central part 11, the isolation broken bridge 13 is clamped in the limiting groove 12 in a sliding manner, the isolation broken bridge 13 is made of a silicon sulfide rubber material, the isolation broken bridge 13 is matched with the shape and the size of the limiting groove 12, a conversion layer 2 is formed by molybdate serving as an oxidation accelerant, the molybdate and aluminum ions form an aluminum molybdate composite protective film, a primer layer 3 is formed by chromate and non-chromate pigment coated by epoxy resin, the chromate is preferably silver chromate, the thickness of the primer layer 3 is 15 mu m, and a finish, the cured layer 5 is composed of polyurethane and epoxy resin, and the thickness of the cured layer 5 is 55 μm.
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; step nine, curing and spraying;
in the first step, raw materials required by the aluminum profile are put into a smelting furnace to be melted, and the internal temperature of the smelting furnace is controlled within the range of 700 ℃;
in the second step, after the smelting is finished, carrying out primary refining in a smelting furnace, transferring to a standing furnace after the primary refining for secondary refining, then introducing argon gas for refining degassing, and then standing for 1.5 hours to form refined liquid;
in the third step, the aluminum profile in the molten state is cooled to 550 ℃ and then cast into a mold, and then the aluminum profile is cooled to the normal temperature state in a water cooling mode and stands for 15min to obtain the aluminum profile same as the mold;
in the fourth step, the formed aluminum profile is subjected to aging treatment at the temperature of 100 ℃ for 15h, and then is cooled to the normal temperature;
in the fifth step, the surface of the aluminum profile is treated, burrs and redundant parts on the outer surface are removed, and then the surface is dedusted to keep a clean state;
in the sixth step, the preparation of the transition layer is carried out by adopting a chemical reaction, molybdate is used as an oxidation promoter, and the molybdate and aluminum ions form an aluminum molybdate composite protective film;
in the seventh step, 20 parts of epoxy resin-coated silver chromate, 30 parts of non-chromate pigment and 15 parts of distilled water are mixed to form a primer coating, the silver chromate can play a role of a corrosion inhibitor, the primer coating is uniformly sprayed on the outer surface of the aluminum profile by a spraying machine, the thickness of the coating is 15 microns, then the aluminum profile is dried by a drying box, the internal temperature of the drying box is 150 ℃, and the drying time is 2.5 hours;
in the step eight, spraying powder coating on the outer surface of the aluminum profile by using electrostatic powder spraying equipment, wherein under the electrostatic action, powder can be uniformly adsorbed on the surface of the aluminum profile to form a powdery coating, conveying the aluminum profile sprayed with the powder into a drying room at 180 ℃ through a conveying chain for heating, and preserving heat for corresponding time for 15min to enable the powder coating to be melted, leveled and solidified on the surface of the aluminum profile;
the aluminum profile enters a spray gun position of a powder spraying room through a conveying chain to prepare spraying operation, a static generator releases high-voltage static electricity (negative electrode) to a space in the direction of the aluminum profile through an electrode needle at a gun opening of the spray gun, the high-voltage static electricity enables a mixture of powder sprayed out of the gun opening and compressed air and air around the electrode to be ionized (to be negatively charged), the aluminum profile is grounded (to be grounded) through the conveying chain through a hanger, so that electric field powder is formed between the spray gun and the aluminum profile and reaches the surface of the aluminum profile under the double pushing of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the aluminum profile by means;
in the ninth step, a coating agent formed by mixing 35 parts of polyurethane, 25 parts of epoxy resin and 40 parts of distilled water is uniformly sprayed on the outer surface of the aluminum profile through a spraying machine, the spraying thickness is 55 microns, then, a drying box is used for drying, the temperature inside the drying box is 85 ℃, the drying time is 2 hours, and then the aluminum profile with high corrosion resistance is obtained.
Example two
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a high corrosion resistance's aluminium alloy, includes section bar body 1, transition layer 2, priming paint layer 3, finish paint layer 4 and cured layer 5, and the surface of section bar body 1 is handled through the chemical process and is formed transition layer 2, and 3 even coatings on the surface on transition layer 2 on the priming paint layer, and finish paint layer 4 evenly coats on 3's on the surface on priming paint layer, and 5 even coatings in cured layer are on the surface of finish paint layer 4.
The profile body 1 comprises a central part 11, limiting grooves 12 and isolating broken bridges 13, wherein the central part 11 is positioned at the transverse central position of the profile body 1, the central part 11 is a hollow circular channel, the central part 11 and the profile body are arranged in an integrated structure, the profile body 1 is provided with the limiting grooves 12, the number of the limiting grooves 12 is four, the four limiting grooves 12 are respectively positioned at the periphery of the outer surface of the central part 11, the isolating broken bridges 13 are slidably clamped in the limiting grooves 12, the isolating broken bridges 13 are made of vulcanized silicone rubber, the isolating broken bridges 13 are matched with the limiting grooves 12 in shape and size, and the conversion layer 2 is a film obtained by silane treatment; the primer layer 3 consists of an epoxy-coated chromate, preferably silver chromate, and a non-chromate pigment, the primer layer 3 having a thickness of 18 μm, the topcoat layer 4 being an electrostatic powder sprayed layer, the cured layer 5 consisting of polyurethane and epoxy, the cured layer 5 having a thickness of 70 μm.
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; step nine, curing and spraying;
in the first step, raw materials required by the aluminum profile are put into a smelting furnace to be melted, and the internal temperature of the smelting furnace is controlled within the range of 750 ℃;
in the second step, after the smelting is finished, carrying out primary refining in a smelting furnace, transferring to a standing furnace after the primary refining for secondary refining, then introducing argon gas for refining degassing, and then standing for 1.8 hours to form refined liquid;
in the third step, the aluminum profile in the molten state is cooled to 565 ℃ and then cast into a mold, and then the aluminum profile is cooled to the normal temperature state in a water cooling mode and stands for 18min to obtain the aluminum profile the same as the mold;
in the fourth step, the formed aluminum profile is subjected to aging treatment at the temperature of 125 ℃ for 17.5 hours, and then is cooled to the normal temperature;
in the fifth step, the surface of the aluminum profile is treated, burrs and redundant parts on the outer surface are removed, and then the surface is dedusted and deoiled to keep a clean state;
in the sixth step, the preparation of the transition layer is carried out by adopting a chemical reaction, and is a film obtained by silane treatment, specifically, the aluminum profile subjected to surface treatment is soaked in a metaphyloxypropyl methoxysilane aqueous solution with the mass percentage concentration of 0.5% at 78 ℃ for 20min, and is taken out and naturally dried;
in the seventh step, 26 parts of epoxy resin-coated silver chromate, 34 parts of non-chromate pigment and 17.5 parts of distilled water are mixed to form a primer coating, the silver chromate can play a role of a corrosion inhibitor, the primer coating is uniformly sprayed on the outer surface of the aluminum profile by a spraying machine, the thickness of the coating is 18 microns, then a drying box is used for drying, the temperature inside the drying box is 165 ℃, the drying time is 2.8 hours, and particularly, a conversion film obtained through silane treatment can be better combined with the primer coating;
in the step eight, spraying powder coating on the outer surface of the aluminum profile by using electrostatic powder spraying equipment, wherein under the electrostatic action, powder can be uniformly adsorbed on the surface of the aluminum profile to form a powdery coating, conveying the aluminum profile sprayed with the powder into a drying room at 190 ℃ through a conveying chain for heating, and preserving heat for a corresponding time of 17.5min to enable the powder coating to be melted, leveled and solidified on the surface of the aluminum profile;
the aluminum profile enters a spray gun position of a powder spraying room through a conveying chain to prepare spraying operation, a static generator releases high-voltage static electricity (negative electrode) to a space in the direction of the aluminum profile through an electrode needle at a gun opening of the spray gun, the high-voltage static electricity enables a mixture of powder sprayed out of the gun opening and compressed air and air around the electrode to be ionized (to be negatively charged), the aluminum profile is grounded (to be grounded) through the conveying chain through a hanger, so that electric field powder is formed between the spray gun and the aluminum profile and reaches the surface of the aluminum profile under the double pushing of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the aluminum profile by means;
in the ninth step, a coating agent formed by mixing 36 parts of polyurethane, 30 parts of epoxy resin and 42.5 parts of distilled water is uniformly sprayed on the outer surface of the aluminum profile through a spraying machine, the spraying thickness is 70 microns, then a drying box is used for drying, the temperature inside the drying box is 95 ℃, the drying time is 3.5 hours, and then the aluminum profile with high corrosion resistance is obtained.
EXAMPLE III
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a high corrosion resistance's aluminium alloy, includes section bar body 1, transition layer 2, priming paint layer 3, finish paint layer 4 and cured layer 5, and the surface of section bar body 1 is handled through the chemical process and is formed transition layer 2, and 3 even coatings on the surface on transition layer 2 on the priming paint layer, and finish paint layer 4 evenly coats on 3's on the surface on priming paint layer, and 5 even coatings in cured layer are on the surface of finish paint layer 4.
The profile body 1 comprises a central part 11, a limiting groove 12 and an isolation broken bridge 13, wherein the central part 11 is positioned at the transverse central position of the profile body 1, the central part 11 is a hollow circular channel, the central part 11 and the profile body are arranged in an integrated structure, the profile body 1 is provided with the limiting groove 12, the number of the limiting grooves 12 is four, the four limiting grooves 12 are respectively positioned at the periphery of the outer surface of the central part 11, the isolation broken bridge 13 is clamped in the limiting groove 12 in a sliding way, the isolation broken bridge 13 is made of a silicon sulfide rubber material, the isolation broken bridge 13 is matched with the shape and the size of the limiting groove 12, a transformation layer 2 is a manganese oxide film formed by permanganate, a primer layer 3 is composed of chromate and non-chromate pigment which are coated by epoxy resin, the chromate is preferably silver chromate, the thickness of the primer layer 3 is 25 mu m, a finish layer 4 is an electrostatic powder spraying layer, a curing layer 5 is composed of, the thickness of the cured layer 5 was 80 μm.
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; step nine, curing and spraying;
in the first step, raw materials required by the aluminum profile are put into a smelting furnace to be melted, and the internal temperature of the smelting furnace is controlled within the range of 800 ℃;
in the second step, after the smelting is finished, carrying out primary refining in a smelting furnace, transferring to a standing furnace after the primary refining for secondary refining, then introducing argon gas for refining and degassing, and then standing for 2 hours to form refined liquid;
in the third step, the aluminum profile in the molten state is cooled to 580 ℃ and then cast into a mold, and then the aluminum profile is cooled to the normal temperature state in a water cooling mode and stands for 20min to obtain the aluminum profile the same as the mold;
in the fourth step, the formed aluminum profile is subjected to aging treatment at the temperature of 150 ℃ for 20 hours, and then is cooled to the normal temperature;
in the fifth step, the surface of the aluminum profile is treated, burrs and redundant parts on the outer surface are removed, and then the surface is dedusted to keep a clean state;
in the sixth step, the transition layer is prepared by adopting a chemical reaction, and a manganese oxide film is formed by using permanganic acid;
in the seventh step, 32 parts of epoxy resin-coated silver chromate, 38 parts of non-chromate pigment and 20 parts of distilled water are mixed to form a primer coating, the silver chromate can play a role of a corrosion inhibitor, the primer coating is uniformly sprayed on the outer surface of the aluminum profile by a spraying machine, the thickness of the coating is 25 microns, then the aluminum profile is dried by a drying box, the internal temperature of the drying box is 180 ℃, and the drying time is 3 hours;
in the step eight, spraying powder coating on the outer surface of the aluminum profile by using electrostatic powder spraying equipment, wherein under the electrostatic action, powder can be uniformly adsorbed on the surface of the aluminum profile to form a powdery coating, conveying the aluminum profile sprayed with the powder into a drying room at 200 ℃ through a conveying chain for heating, and preserving heat for 20min correspondingly to melt, level and solidify the powder coating on the surface of the aluminum profile;
the aluminum profile enters a spray gun position of a powder spraying room through a conveying chain to prepare spraying operation, a static generator releases high-voltage static electricity (negative electrode) to a space in the direction of the aluminum profile through an electrode needle at a gun opening of the spray gun, the high-voltage static electricity enables a mixture of powder sprayed out of the gun opening and compressed air and air around the electrode to be ionized (to be negatively charged), the aluminum profile is grounded (to be grounded) through the conveying chain through a hanger, so that electric field powder is formed between the spray gun and the aluminum profile and reaches the surface of the aluminum profile under the double pushing of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the aluminum profile by means;
in the ninth step, a coating agent formed by mixing 42 parts of polyurethane, 36 parts of epoxy resin and 45 parts of distilled water is uniformly sprayed on the outer surface of the aluminum profile through a spraying machine, the spraying thickness is 80 microns, then, a drying box is used for drying, the temperature inside the drying box is 105 ℃, the drying time is 5 hours, and then the aluminum profile with high corrosion resistance is obtained.
Examples of the experiments
The corrosion resistance of the aluminum profile is detected by adopting a salt spray test and an alkali dropping test, because a plurality of factors influencing the corrosion of the aluminum profile are adopted, the salt spray test is mainly used for detecting the acid resistance of the aluminum profile, the alkali dropping test is mainly used for detecting the alkali resistance of the aluminum profile, and although the single salt spray resistance can not represent the resistance to other media, the salt spray test is generally adopted in the corrosion resistance detection of the aluminum profile as a method for detecting the corrosion resistance of the aluminum profile.
The corrosion resistance tests of the aluminum profiles prepared in the first embodiment, the second embodiment and the third embodiment are respectively carried out, and the conclusion is drawn according to experimental data that the corrosion resistance of the aluminum profile in the second embodiment is superior, and meanwhile, the corrosion resistance of the aluminum profile in the first embodiment and the corrosion resistance of the aluminum profile in the third embodiment are also remarkably improved compared with that of the aluminum profile in the prior art.
The invention has the beneficial effects that:
according to the invention, due to the arrangement of the transition layer 2 and the primer layer 3, a materialized film is formed on the outer surface of the aluminum profile by adopting a chemical method, so that the metal surface is converted into a more corrosion-resistant surface layer or a matched primer forms a surface which is easier to adhere and has stronger bonding force, the transition layer has the function of increasing the bonding and corrosion resistance between the base material and the primer, and meanwhile, the primer layer has an excellent corrosion resistance function.
According to the invention, due to the arrangement of the finish paint layer 4, the finish paint layer 4 enables the surface of the aluminum profile to have good chemical medium resistance; the coating with the thickness of 50-300 mu m can be obtained by spraying the powder once, so that the coating frequency is greatly reduced, the working time is saved, the dripping phenomenon and the pinhole defect generated in the coating process of the solution type coating are avoided, a better film layer can be obtained, and the aluminum profile product is firm and durable; the color is rich and colorful, and the decorative effect is improved; and the electrostatic powder spraying has higher scientific and technological component content and has wider market prospect than anodic oxidation and electrophoretic coating.
According to the invention, due to the arrangement of the curing layer 5, the spraying of the curing layer 5 mainly plays a role in resisting environment, such as weather, ultraviolet, corrosion, medium corrosion and decoration, and the spraying effect is superior to that of a paint spraying process in the aspects of mechanical strength, adhesive force, corrosion, aging and the like, and simultaneously plays a role in protecting the topcoat layer 4.
According to the invention, due to the arrangement of the central part 11, the limiting groove 12 and the isolating broken bridge 13, the mechanical strength of the aluminum profile can be improved through the hollow circular channel of the central part 11, the weight and the material consumption of the aluminum profile are reduced, the isolating broken bridge 13 matched with vulcanized silicone rubber is inserted in the limiting groove 12 to form limiting connection, so that the isolating broken bridge 13 is stably connected with the aluminum profile, meanwhile, the isolating broken bridge 13 can block the temperature of the aluminum profile, the aluminum profile has excellent heat insulation capability, the stability of connection between the aluminum profiles is greatly improved, the structure is simple, and the practicability is strong.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a high corrosion resistance's aluminium alloy, includes section bar body (1), changes layer (2), priming paint layer (3), finish paint layer (4) and cured layer (5), its characterized in that: the outer surface of section bar body (1) is handled through the chemical process and is formed transition layer (2), priming paint layer (3) even coating is on the surface of transition layer (2), finish paint layer (4) even coating is on the surface of priming paint layer (3), cured layer (5) even coating is on the surface of finish paint layer (4).
2. The aluminum profile with high corrosion resistance as recited in claim 1, wherein: the section bar body (1) comprises a central portion (11), a limiting groove (12) and an isolation bridge cut-off (13), wherein the central portion (11) is located at the transverse central position of the section bar body (1), the central portion (11) is a hollow circular channel, and the central portion (11) and the section bar body are arranged in an integrally formed structure.
3. The aluminum profile with high corrosion resistance as recited in claim 1, wherein: the section bar is characterized in that limiting grooves (12) are formed in the section bar body (1), the number of the limiting grooves (12) is four, the four limiting grooves (12) are located on the periphery of the outer surface of the central portion (11) respectively, the isolation broken bridge (13) is connected to the inside of the limiting grooves (12) in a sliding and clamping mode, the isolation broken bridge (13) is made of vulcanized silicone rubber, and the isolation broken bridge (13) is matched with the limiting grooves (12) in shape and size.
4. The aluminum profile with high corrosion resistance as recited in claim 1, wherein: the transition layer (2) is a film formed by chromic hydroxide, a precipitated heavy metal phosphate film, a silane-treated film or a manganese oxide film formed by permanganate.
5. The aluminum profile with high corrosion resistance as recited in claim 1, wherein: the primer layer (3) consists of epoxy resin coated chromate and non-chromate pigments, the thickness of the primer layer (3) being 15-25 μm.
6. The aluminum profile with high corrosion resistance as recited in claim 1, wherein: the finishing paint layer (4) is an electrostatic powder spraying layer, the cured layer (5) is composed of polyurethane and epoxy resin, and the thickness of the cured layer (5) is 55-80 mu m.
7. The processing technology of the aluminum profile with high corrosion resistance is characterized by comprising the following steps:
step one, smelting a section; step two, refining and post-processing; step three, casting; step four, aging treatment; step five, post-treatment; step six, preparing a transition layer; step seven, spraying a primer; step eight, finishing treatment; step nine, curing and spraying;
in the first step, putting the aluminum profile raw material into a smelting furnace for smelting, and controlling the internal temperature of the smelting furnace to be between 700 ℃ and 800 ℃;
in the second step, after the smelting is finished, carrying out primary refining in a smelting furnace, transferring to a standing furnace after the primary refining for secondary refining, then introducing argon gas for refining degassing, and then standing for 1.5-2h to form refined liquid;
in the third step, the aluminum profile in the molten state is cooled to 550-580 ℃, then cast into a mold, cooled to the normal temperature by adopting a water cooling mode, and kept stand for 15-20min to obtain the aluminum profile same as the mold;
in the fourth step, the formed aluminum profile is subjected to aging treatment at the temperature of 100 ℃ and 150 ℃, kept for 15-20h and then cooled to the normal temperature;
in the fifth step, the surface of the aluminum profile is treated, burrs and redundant parts on the outer surface are removed, and then the surface is dedusted to keep a clean state;
in the sixth step, the preparation of the transition layer is carried out by adopting a chemical reaction to obtain a film formed by chromium hydroxide, a precipitated heavy metal phosphate film, a silane-treated film or a manganese oxide film formed by using permanganate;
in the seventh step, 20-32 parts of epoxy resin coated silver chromate, 30-38 parts of non-chromate pigment and 15-20 parts of distilled water are mixed to form primer paint, the primer paint is uniformly sprayed on the outer surface of the aluminum profile by a spraying machine, the thickness of the coating is 15-25 mu m, and then the aluminum profile is dried by a drying box, the temperature inside the drying box is 150-180 ℃, and the drying time is 2.5-3 h;
in the step eight, spraying powder coating on the outer surface of the aluminum profile by using electrostatic powder spraying equipment, wherein under the electrostatic action, powder can be uniformly adsorbed on the surface of the aluminum profile to form a powdery coating, and the powdery coating is baked at high temperature, leveled and cured to form a final finish coating;
in the ninth step, a coating agent formed by mixing 35-42 parts of polyurethane, 25-36 parts of epoxy resin and 40-45 parts of distilled water is uniformly sprayed on the outer surface of the aluminum profile through a spraying machine, the spraying thickness is 55-80 mu m, then a drying box is used for drying, the temperature inside the drying box is 85-105 ℃, the drying time is 2-5h, and then the aluminum profile with high corrosion resistance is obtained.
8. The processing technology of the aluminum profile with high corrosion resistance as recited in claim 7, is characterized in that: in the eighth step, the aluminum profile enters a spray gun position of a powder spraying room through a conveying chain to prepare spraying operation, a static generator releases high-voltage static electricity to a space in the direction of the aluminum profile through an electrode needle at a gun opening of the spray gun, the high-voltage static electricity enables a mixture of powder sprayed out of the gun opening and compressed air and air around the electrode to be ionized, the aluminum profile is grounded through the conveying chain through a hanger, so that electric field powder is formed between the spray gun and the aluminum profile and reaches the surface of the aluminum profile under the double pushing of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the aluminum profile by means of electrostatic attraction.
9. The processing technology of the aluminum profile with high corrosion resistance as recited in claim 7, is characterized in that: the high-temperature baking, leveling and curing in the step eight mainly comprises the following steps: and conveying the aluminum profile sprayed with the powder into a drying room at the temperature of 180-200 ℃ through a conveying chain for heating, and preserving the heat for corresponding time of 15-20min to ensure that the powder coating is melted, leveled and cured on the surface of the aluminum profile.
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