Outdoor aluminum alloy heat-insulating anticorrosion box body and manufacturing method thereof

Abstract

The application discloses an outdoor aluminum alloy heat-insulating anticorrosion box body and a manufacturing method thereof. The aluminum alloy heat-insulating anticorrosion box body comprises an aluminum alloy box body and an anticorrosion heat-insulating layer coated on the surface of the aluminum alloy box body; the aluminum alloy box body is a box body of a rare earth element modified aluminum alloy; and the anticorrosion heat-insulating layer comprises the following components in percentage by mass: a rare earth lanthanum-cerium compound powder 22-24%, a resin emulsion 55-60%, a green pigment 8-12%, a filler 5-8% and an additive 3-5%. The manufacturing method comprises the following steps: sequentially performing heat treatment on a rare earth element modified aluminum alloy plate according to a T4 state heat treatment system; performing cold state bending treatment; laser welding to form a box body; and after coating the anticorrosion heat-insulating layer on the surface of the box body, performing paint baking and aging treatment to obtain the outdoor aluminum alloy heat-insulating anticorrosion box body. The outdoor heat-insulating box body is light in weight, high in strength, heat-insulating, weather-resistant and capable of improving condensation in the box body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of outdoor box and manufacturing method, in particular to an outdoor aluminum alloy heat-insulating anticorrosion box and manufacturing method. TECHNICAL BACKGROUND

[0002] The outdoor box is an important protective supporting device of power grid, which is used as the shell of power grid equipment mechanism box, terminal box, control cabinet, ring network cabinet and box transformer, etc., to form a local environment similar to indoor for the above-mentioned devices, so as to improve the service environment of the devices in the box and ensure the accurate action and operation reliability of the devices. At present, the outdoor box is mostly made of galvanized cold-rolled steel plate, plastic-coated cold-rolled steel plate, cast aluminum, stainless steel plate, SMC composite material and other materials, which has low manufacturing threshold, and has problems of rough manufacturing and installation process and insufficient long-term weathering and corrosion resistance. SUS304 material contains Ni element, which is used as box material and has high price, and appears pitting defects in the presence of Cl ion and humid environment. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art, in particular to the problems of high price and insufficient long-term weathering and corrosion resistance of the prior art, and to provide an outdoor aluminum alloy heat-insulating anticorrosion box and manufacturing method with low price and long-term stable corrosion resistance.

[0004] To solve the above technical problems, the present application adopts the following technical scheme.

[0005] An outdoor aluminum alloy heat-insulating anticorrosion box comprises an aluminum alloy box and an anticorrosion heat-insulating layer coated on the surface of the aluminum alloy box, wherein the aluminum alloy box is a box made of rare earth element modified aluminum alloy, and the anticorrosion heat-insulating layer comprises the following components in terms of mass percentage: 22-24% of rare earth lanthanum-cerium compound powder, 55-60% of resin emulsion, 8-12% of green pigment, 5-8% of filler and 3-5% of additive.

[0006] The box made of rare earth element modified aluminum alloy comprises the following components: 0.05-0.1wt% of Sc, 1.2-1.5wt% of Si, 1.3-1.6wt% of Mg, 0.5-06wt% of Cu, less than 0.05wt% of Fe, and the rest is aluminum.

[0007] The content of Sc in the components of the box made of rare earth element modified aluminum alloy is 0.1wt%.

[0008] The green pigment is chromium oxide green, and the filler is talc powder.

[0009] As a general inventive concept, the present application also provides a manufacturing method for manufacturing an outdoor aluminum alloy heat-insulating anticorrosion box, comprising the following steps:

[0010] S1, rare earth element modified aluminum alloy sheet is heat treated according to the T4 state heat treatment regime;

[0011] S2, cold bending of the heat-treated aluminum alloy sheet;

[0012] S3, laser welding aluminum alloy sheets that have undergone cold bending into a box body;

[0013] S4. After coating the surface of the enclosure with an anti-corrosion and heat insulation layer, a baking paint and aging treatment are carried out to obtain an outdoor aluminum alloy heat-insulating and anti-corrosion enclosure.

[0014] In step S2, the cold bending process is performed twice. During the first cold bending process, the bending radius is 3-4 mm, the bending angle is 90 degrees, the lower die slot opening width is V16-V22, the upper die straight cutter is 88 degrees, and the pressure is 50-60 tons. The second bending process is a correction bending process with a correction degree of 8-15 degrees.

[0015] In step S4, the temperature for baking paint and aging treatment is 195-205℃, and the time is 1-1.5h.

[0016] In step S3, the laser energy used in the laser welding is 1200-1800W, and the welding speed is 1.0-1.5m / s.

[0017] In step S1, the rare earth element modified aluminum alloy sheet is prepared by the following steps:

[0018] A1, 6-series aluminum alloy masterbatch and Al-Sc intermediate compound are smelted at a temperature of 730-760℃ to obtain aluminum alloy sheet;

[0019] A2, the aluminum alloy sheet is rolled into a sheet with a thickness of less than 2mm to obtain the rare earth element modified aluminum alloy sheet.

[0020] In step S1, the heat treatment specifically includes the following steps: holding the rare earth element modified aluminum alloy plate at a temperature of 525-540℃ for 2-3 hours and then cooling and quenching it.

[0021] Preferably, the rare earth element modified aluminum alloy sheet further includes the following rolling process before heat treatment:

[0022] B1, Hot rolling: Rare earth element modified aluminum alloy sheet is hot rolled multiple times at 450-480℃, with a deformation ratio of 30%-40% each time, until the sheet thickness is less than 20mm, and the final rolling temperature is 450℃.

[0023] B2, Cold rolling: The hot-rolled sheet is subjected to multiple cold rolling processes, with a deformation ratio of 10% each time, until the sheet thickness is less than 2mm.

[0024] The present application has the following beneficial effects:

[0025] 1、The outdoor aluminum alloy heat insulation anticorrosion box body of the present application contains rare earth lanthanum cerium compound powder in the rare earth element modified aluminum alloy box body, which can react with impurity elements such as O in the aluminum alloy to purify the matrix, and on the other hand, the rare earth element reacts with O to form rare earth element oxide which can act as a non-spontaneous nucleation core to increase the number of nucleation and refine the aluminum alloy structure. More importantly, the rare earth element tends to segregate at the grain boundaries of the aluminum alloy, inhibits the harmful behavior of impurity elements at the grain boundaries, and improves the cold deformation ability of the aluminum alloy, so that the strength and toughness of the aluminum alloy plate are balanced, which can maximize the strength of the aluminum alloy and also has a certain elongation, and can be cold bent 90° without cracking.

[0026] 2、The outdoor aluminum alloy heat insulation anticorrosion box body of the present application, the anticorrosion heat insulation layer is formed by hot air convection at 195-205℃ in the baking room for 1-1.5 hours, and the baking film quality is better than that of normal temperature spraying, the heat insulation effect reaches 17℃, and passes the 168h corrosion resistance salt spray test. At the same time, the aging treatment at 195-205℃ can improve the yield strength of the aluminum alloy to above 290MPa, improve the on-site service strength of the box body, and further inhibit the condensation of the indoor wall of the outdoor box body caused by the temperature difference between the indoor and outdoor walls of the outdoor box body, to improve its anticorrosion and anti-condensation ability, and further improve the environmental suitability of the outdoor aluminum alloy box body. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The flow chart of the manufacturing method of the outdoor aluminum alloy heat insulation anticorrosion box body of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described below in combination with the drawings and specific preferred embodiments, but the protection scope of the present application is not limited thereby. In the following examples, if not specifically stated, the raw materials and instruments used are commercially available, and the data obtained are the average values of more than three repeated experiments.

[0029] The outdoor aluminum alloy heat insulation anticorrosion box body comprises an aluminum alloy box body and an anticorrosion heat insulation layer coated on the surface of the aluminum alloy box body, the aluminum alloy box body is a box body of rare earth element modified aluminum alloy, and the anticorrosion heat insulation layer comprises the following components in percentage by mass: 22-24% of rare earth lanthanum-cerium compound powder, 55-60% of resin emulsion, 8-12% of green pigment, 5-8% of filler and 3-5% of additive. The box body of the rare earth element modified aluminum alloy contains the rare earth lanthanum-cerium compound powder, which can react with impurity elements such as O in the aluminum alloy to purify the matrix, and the rare earth element reacts with O to generate rare earth element oxide, which can be used as a non-spontaneous nucleation core to increase the number of nucleation and refine the aluminum alloy structure. More importantly, the rare earth element tends to segregate at the grain boundary of the aluminum alloy to inhibit the harmful behavior of impurity elements at the grain boundary, improve the cold deformation capacity of the aluminum alloy, balance the strength and toughness of the aluminum alloy, maximize the strength of the aluminum alloy, and have a certain elongation, which can be cold bent by 90 degrees without cracking.

[0030] The box body of the rare earth element modified aluminum alloy comprises the following components: 0.05-0.1wt% of Sc, 1.2-1.5wt% of Si, 1.3-1.6wt% of Mg, 0.5-06wt% of Cu, less than 0.05wt% of Fe, and the rest is aluminum. The aluminum alloy wood adopted in the embodiment is a 6 series aluminum alloy, which has the advantages of small density, moderate strength, easy processing, corrosion resistance and the like, and the strength of the aluminum alloy can be adjusted by heat treatment to meet the strength and rigidity requirements of manufacturing, processing and later operation. Compared with 304 stainless steel, the aluminum alloy has a larger density advantage, can save the strategic resource Ni element in the 304 stainless steel, and can greatly reduce the material cost, thereby having good economic and social benefits. The rare earth element adopted in the application is Sc, and the atomic radius of Sc reaches 163pm, which can better tend to segregate at the grain boundary of the aluminum alloy, inhibit the harmful behavior of impurity elements at the grain boundary, and improve the cold deformation capacity of the aluminum alloy.

[0031] The content of Sc in the box body of the rare earth element modified aluminum alloy is 0.1wt%.

[0032] The rare earth lanthanum-cerium compound powder is (La2O3+CeO2) rare earth lanthanum-cerium compound powder, the resin emulsion is epoxy resin E-44 and / or E-60, the green pigment is chromium oxide green, the filler is talc powder, and the additive is a mixture of solvent, thickening agent, drying agent, preservative and defoaming agent. The solvent is alcohol such as methanol or ethanol, the thickening agent is clay, the drying agent is cobalt oxide, the preservative is phenol, and the defoaming agent is mineral oil and / or hydrophobic silicon dioxide. The mass ratio of the solvent, thickening agent, drying agent, preservative and defoaming agent is 10:1:1:1:2.

[0033] As Figure 1As shown, a manufacturing method of the outdoor aluminum alloy heat-insulating anticorrosion box body of the present application comprises the following steps:

[0034] S1, heat-treating the rare earth element modified aluminum alloy plate according to a T4 state heat treatment system;

[0035] S2, cold-bending the heat-treated aluminum alloy plate;

[0036] S3, laser welding the cold-bent aluminum alloy plate into a box body;

[0037] S4, after coating the box body surface with an anticorrosion heat-insulating layer, carrying out baking and aging treatment to obtain the outdoor aluminum alloy heat-insulating anticorrosion box body.

[0038] The anticorrosion heat-insulating layer is formed by the heat-insulating anticorrosion coating layer in the baking oven through 1-1.5 hours of hot air convection at a temperature of 195-205℃, and the baking film quality is better than that of normal temperature spraying, the heat-insulating effect reaches 17℃, and it passes the 168h corrosion-resistant salt spray test. Meanwhile, the aging treatment at a temperature of 195-205℃ can improve the yield strength of the 6-series aluminum alloy to above 290MPa, improve the on-site service strength of the box body, and further inhibit the condensation of the indoor wall of the outdoor box body caused by the temperature difference between the indoor and outdoor walls of the outdoor box body, so as to improve the corrosion and condensation resistance of the box body and further improve the environmental suitability of the outdoor aluminum alloy box body.

[0039] Embodiment 1

[0040] The manufacturing method of the outdoor aluminum alloy heat-insulating anticorrosion box body of the present application comprises the following steps:

[0041] B1, heat-treating the 6-series aluminum alloy plate modified by rare earth Sc according to a T4 state heat treatment system, and then carrying out cold-bending treatment and laser welding treatment.

[0042] B2, coating the heat-insulating anticorrosion paint containing more than 20% of rare earth lanthanum and cerium compound powder on the outer plate surface of the aluminum alloy box body in the baking oven, and carrying out baking and aging treatment, and forming a film through 1 hour of hot air convection at a temperature of 195-205℃ (200℃ in the present embodiment).

[0043] Through the above processing and manufacturing, the outdoor box body is light in weight, high in strength, heat-insulating, weather-resistant, and the condensation in the box body is improved.

[0044] The 6-series aluminum alloy plate modified by Sc is prepared by the following preparation steps:

[0045] 1. The 6 series aluminum alloy master batch is prepared, the melting temperature is 730-760 °C (750 °C in the embodiment), the Al-Sc intermediate compound (Sc is 1.8 wt%) is added, the rare earth element modified aluminum alloy plate is obtained, the composition of the rare earth element modified aluminum alloy plate is 0.1 wt% Sc, 1.2-1.5 wt% Si (1.5 wt% in the embodiment), 1.3-1.6 wt% Mg (1.5 wt% in the embodiment), 0.5-0.6 wt% Cu (0.5 wt% in the embodiment), the Fe content is less than 0.5 wt%, and the balance is aluminum.

[0046] 2. The rare earth element modified aluminum alloy plate is rolled, hot rolling is first carried out and then cold rolling. The hot rolling opening rolling temperature is 470-480 °C (475 °C in the embodiment), the rolling deformation ratio is not less than 30% (30% in the embodiment) each time, multiple rolling is carried out until the hot rolling thickness is 20 mm, and the final rolling temperature is 450 degrees. Then cold rolling is carried out, the rolling deformation ratio is 10%, and the final rolling plate thickness is 2 mm.

[0047] 3. Heat treatment, after the plate is coiled (the plate is very long, the plate is coiled and placed in the furnace for heating), quenching is carried out, the temperature is controlled to be 525-540 °C, the holding time is 2 hours, the quenching mode is strong wind, the quenching speed is about 5 °C / s, finally plastic film is covered on the surface for cutting and saving, and natural failure is carried out.

[0048] 4. The 6xxx aluminum alloy plate is obtained by cutting and cutting 5 pieces of 6xxx aluminum alloy plate, each with a width of 1250 mm and a length of 2500 mm.

[0049] In step B1, when the cold bending treatment is carried out, the bending radius is 3.5 mm, the bending angle is 90°, the lower die groove opening width V22 is 88 degrees, the upper die straight knife is 88 degrees, the pressure is 50 tons, and the cold bending treatment is carried out at least twice. The second time is the correction bending, and the correction degree is 8 degrees. The cold bending machine is used for cold bending treatment.

[0050] In step B1, when the laser welding treatment is carried out, the aluminum alloy welding wire ER5087 is selected, the laser energy is 1500 W, the welding speed is 1.2 m / s, and the T4 system heat treatment is carried out after the 6xxx aluminum alloy plate support is laser welded.

[0051] In step B2, the heat insulation and corrosion resistant paint is composed of rare earth lanthanum cerium compound powder, resin emulsion, green pigment (chromium oxide green), part of filler (talc) and additive. In the embodiment, the rare earth lanthanum cerium compound powder is 24%, the resin emulsion is 56%, the green pigment is 10%, the filler is 6%, and the additive is 4%. The paint is brushed on the outer plate surface of the aluminum alloy box body in the baking paint room.

[0052] In this embodiment, the rare earth lanthanum cerium compound powder is (La2O3+CeO2) rare earth lanthanum cerium compound powder, the resin emulsion is epoxy resin E-44, the auxiliary is a mixture of solvent, thickening agent, drying agent, preservative and defoaming agent, the solvent is ethanol, the thickening agent is clay, the drying agent is cobalt oxide, the preservative is phenol, and the defoaming agent is silicon dioxide, and the mass ratio of the solvent, the thickening agent, the drying agent, the preservative and the defoaming agent is 10:1:1:1:2.

[0053] In step B2, the paint is baked and aged, the temperature of the paint baking room is set to 195-205 ℃ (200 ℃ in this embodiment), the paint is baked for 1 hour through hot air convection, the film is formed, and the aging treatment of the 6xxx aluminum alloy is completed at the same time. When the aging treatment is performed at a temperature outside the range of 195-205 ℃, the strength of the aluminum alloy plate will be lower than 290 MPa, which does not meet the target strength requirement.

[0054] The final outdoor aluminum alloy heat-insulating and corrosion-resistant box body has a reflectance of 0.82, a radiation coefficient of 0.87, and a heat-insulating effect of not less than 17 ℃, and no corrosion marks are found after a salt spray simulation test of PH value 6.8, salt solution content 5.3% and time 168 h, and the yield strength of the 6xxx aluminum alloy box body material is increased to more than 320 MPa.

[0055] Example 2

[0056] This embodiment is basically the same as example 1, except that the content of Sc in the rare earth element modified aluminum alloy is 0.05 wt%.

[0057] The yield strength of the outdoor aluminum alloy heat-insulating and corrosion-resistant box body prepared in this embodiment decreases relative to example 1, and is about 291 MPa.

[0058] Comparative Example 1

[0059] This comparative example is basically the same as the example, except that the components of the mildew-proof heat-insulating layer are as follows in mass:

[0060] 15% of the rare earth lanthanum cerium compound powder, 66% of the resin emulsion, 6% of the green pigment (chromium oxide green), 10% of the filler (talc), and 3% of the auxiliary.

[0061] The outdoor aluminum alloy heat-insulating and corrosion-resistant box body prepared in this comparative example has a reflectance of 0.72, a radiation coefficient of 0.77, and a heat-insulating effect of less than 10 ℃, and the effects of corrosion resistance and heat insulation are not very good, which are much lower than those of example 1.

[0062] Comparative Example 2

[0063] The comparative example is substantially the same as example 1, except that the parameters of the cold bending treatment are slightly different, specifically, in the first cold bending treatment, the bending radius is 1.5 mm, the lower die groove opening width V10, the bending angle is 90°, the upper die straight knife 88 degrees, the pressure is 50 tons; in the correction bending, the correction degree is 2 degrees.

[0064] In the cold bending treatment of the comparative example, the aluminum alloy cracks slightly at the bending part.

[0065] Comparative example 3

[0066] The comparative example is substantially the same as example 1, except that the aging treatment temperature is 175℃.

[0067] The yield strength of the outdoor aluminum alloy box body made in the comparative example is 191 MPa, which is much lower than that of example 1.

[0068] Comparative example 4

[0069] The comparative example is substantially the same as example 1, except that the content of Sc in the rare earth element modified aluminum alloy is 0.2wt%.

[0070] The yield strength of the outdoor aluminum alloy box body made in the comparative example is lower than that of example 1, about 276 MPa.

[0071] Comparative example 5

[0072] The comparative example is substantially the same as example 1, except that the baking paint and aging treatment temperature is 175℃.

[0073] The yield strength of the outdoor aluminum alloy box body made in the comparative example is 191 MPa, which is lower than that of example 1, the paint dries slowly, and the color is deviated.

[0074] Comparative example 6

[0075] The comparative example is substantially the same as example 1, except that the baking paint and aging treatment temperature is 240℃.

[0076] The yield strength of the outdoor aluminum alloy box body made in the comparative example is 158 MPa, which is lower than that of example 1, the paint dries quickly, and local bubbles will occur.

[0077] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the spirit and technical solutions of the present application, can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. An outdoor aluminum alloy heat-insulating anticorrosive box body comprising an aluminum alloy box body and an anticorrosive heat-insulating layer coated on the surface of the aluminum alloy box body, characterized in that, The aluminum alloy box is a box of rare earth element modified aluminum alloy, and the components of the anticorrosion and heat insulation layer include the following components in percentage by mass: 22-24% of rare earth lanthanum and cerium compound powder, 55-60% of resin emulsion, 8-12% of green pigment, 5-8% of filler, and 3-5% of auxiliary agent; the rare earth lanthanum and cerium compound powder is a La2O3 and CeO2 compound powder.

2. The outdoor aluminum alloy thermally insulated corrosion-proof cabinet according to claim 1, characterized in that, The box of rare earth element modified aluminum alloy includes the following components: 0.05-0.1wt% of Sc, 1.2-1.5wt% of Si, 1.3-1.6wt% of Mg, 0.5-06wt% of Cu, and less than 0.05wt% of Fe, and the rest is aluminum.

3. The outdoor aluminum alloy thermally insulated corrosion-proof cabinet according to claim 2, characterized in that, The content of Sc in the components of the box of rare earth element modified aluminum alloy is 0.1wt%.

4. The outdoor aluminum alloy thermally insulated corrosion-proof cabinet according to claim 1, characterized in that: The green pigment is chromium oxide green, and the filler is talcum powder.

5. A manufacturing method of the outdoor aluminum alloy heat-insulating corrosion-resistant box body according to any one of claims 1 to 4, characterized by, The method includes the following steps: S1, heat treating the rare earth element modified aluminum alloy plate according to a T4 state heat treatment system; S2, cold bending the aluminum alloy plate after heat treatment; S3, laser welding the aluminum alloy plate after cold bending into a box; S4, after coating the box with an anticorrosion and heat insulation layer, performing paint baking and aging treatment to obtain an outdoor aluminum alloy heat insulation and anticorrosion box; in the step S2, the cold bending treatment is performed twice, the bending radius is 3-4mm, the bending angle is 90 degrees, the opening width of the lower die groove is V16-V22, the upper die straight knife is 88 degrees, the pressure is 50-60 tons, and the second cold bending treatment is correction bending treatment with a correction angle of 8-15 degrees.

6. The production method according to claim 5, characterized by, In the step S4, the temperature of the paint baking and aging treatment is 195-205℃, and the time is 1-1.5h.

7. The method of manufacturing according to claim 5, wherein, In the step S3, the laser energy used in the laser welding is 1200-1800W, and the welding speed is 1.0-1.5m / s.

8. The method of manufacturing of claim 5, wherein, In the step S1, the rare earth element modified aluminum alloy plate is prepared by the following preparation steps: A1, melting 6-series aluminum alloy master batch and Al-Sc intermediate compound at a temperature of 730-760℃ to obtain an aluminum alloy plate; A2, rolling the aluminum alloy plate into a plate with a thickness of less than 2mm to obtain the rare earth element modified aluminum alloy plate.

9. The method of manufacturing of claim 5, wherein, In the step S1, the heat treatment specifically includes the following steps: heat treating the rare earth element modified aluminum alloy plate at a temperature of 525-540℃ for 2-3h and then cooling and quenching.

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