CN102925770A - Production method of oxidation-colored electrophoresis-painted aluminum alloy section bars - Google Patents
Production method of oxidation-colored electrophoresis-painted aluminum alloy section bars Download PDFInfo
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- CN102925770A CN102925770A CN2012103081410A CN201210308141A CN102925770A CN 102925770 A CN102925770 A CN 102925770A CN 2012103081410 A CN2012103081410 A CN 2012103081410A CN 201210308141 A CN201210308141 A CN 201210308141A CN 102925770 A CN102925770 A CN 102925770A
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Abstract
The invention disclosed a production method of oxidation-colored electrophoresis-painted aluminum alloy section bars. The production method comprises the steps of aluminum ingot and other raw material preparation, aluminum alloy round ingot smelting and casting; casting and sawing; annealing treatment; extrusion molding, oxidation coloring treatment, electrophoresis painting treatment, baking, and the like. According to the invention, anodic oxidation treatment and electrophoresis painting methods are adopted, such that an anti-corrosion performance is improved. According to the invention, waste aluminum material is added into the raw materials, such that aluminum section bar property stability can be promoted, and the possibility of influences on aluminum section bar qualities caused by undetected materials appeared at molten aluminum smelting is reduced. Silicon carbide and modified fly ash are added, such that aluminum alloy strength and hardness are improved, and aluminum alloy comprehensive performance can be improved. The surface of the aluminum section bar is subjected to a plasma treatment, such that painting firmness is improved.
Description
Technical field
The present invention relates to a kind of production method of heat-tinting electrophoretic painting 2024 aluminium alloy extrusions, belong to the aluminum alloy materials processing technique field.
Background technology
2024 aluminium alloys are the typical duralumin in the Al-Cu-Mg, and its composition is more reasonable, and over-all properties is better.A lot of countries all produce this alloy, are consumption maximums in the duralumin.The characteristics of this alloy are: intensity is high, and certain thermotolerance is arranged, and can be used as the working part below 150 ℃.Temperature is higher than 125 ℃, the also height of strength ratio 7075 alloys of 2024 alloys.Forming property is all relatively good under hot state, annealing and the new as-quenched condition, and the heat treatment reinforcement effect is remarkable, is widely used in aircraft structure, rivet, truck hub, propeller element and other all structural parts.But it is relatively poor that the alloy profile that is processed into by 2024 aluminium alloys at present has erosion resistance, falls easily the shortcomings such as lacquer.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, a kind of production method of heat-tinting electrophoretic painting 2024 aluminium alloy extrusions is provided, improve the over-all properties of aluminium alloy extrusions.
The technical solution used in the present invention is as follows:
The production method of heat-tinting electrophoretic painting 2024 aluminium alloy extrusions, it is characterized in that, comprise the steps such as aluminium ingot and other feed proportioning, melting and casting aluminum alloy round ingot, casting and sawing, anneal, extrusion molding, heat-tinting processing, electrophoretic painting, oven dry, concrete steps are as follows:
(1) aluminium ingot and other feed proportioning
By following raw materials in part by weight: aluminium section bar waste product and other aluminium scrap, 5-10 modified coal ash that 60-70 aluminium ingot, 30-40 reclaim carry out proportioning;
(2) melting and casting aluminum alloy round ingot
First with aluminium ingot, the aluminium section bar waste product that reclaims and other aluminium scrap drop into smelting furnace and carry out melting, when treating that it becomes molten state, add modified coal ash, make it uniformly dispersing, then drop into an amount of AlTiC grain-refining agent and carry out refining, by adding alloying element, so that wherein the quality percentage composition of each element is: Si≤0.5%, Mg 1.2-1.8%, Fe≤0.50%, Cu≤3.8-4.9%, Mn 0.30-1.0%, Cr≤0.10%, Zn≤0.25%, Ti≤0.15%, other elements add up to≤0.15%, all the other are that Al is at last by degasification, skim the assorted slag in the melt, gas is effectively removed;
(3) casting and sawing
Before the casting melted aluminium liquid was left standstill 20-30 minute, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;
(4) anneal
Carrying out homogenizing annealing after the sawing of aluminium billet processes, detailed process is as follows: be warming up to first under 300-320 ℃, be incubated 2-3 hour, per hour 70-90 ℃ of intensification is heated to 520-550 ℃ of lower insulation 6-8 hour, then air cooling, per hour 60-80 ℃ of intensification is heated to 360-380 ℃ again, and insulation degree 5-6 hour; Be cooled to again 150-180 ℃ of lower insulation 3-4 hour;
(5) extrusion molding
Billet is heated to 450-460 ℃, is incubated 2-3 hour, the round casting rod extrusion molding from mould that then utilizes extrusion machine to heat, 220-240 ℃ of extrusion mould temperature, extrusion speed 10-12 m/min; Air-cooled section bar surface temperature is put into 0-5 ℃ of water and was carried out quench treatment 1-2 minute after 110-130 ℃, the backward wherein maintenance water temperature on the rocks of water temperature rising; Good aluminium alloy extrusions carried out normal temperature alignment processing to take out extruding at last from water, 120-130 ℃ of lower insulation 3-4 hour;
(6) heat-tinting is processed
At first aluminium alloy extrusions being carried out alkali cleaning processes, the sordid thing on surface is cleaned, then take aluminium alloy extrusions as anode, placed electrolytic solution to switch on, anode produces Sauerstoffatom, Sauerstoffatom has very strong oxidisability, generates the Al of one deck excellent property at aluminium alloy section surface
2O
3Protective layer, painted employing electrolytic colouring technology is filled into Al with nickel ion
2O
3In the protective layer, make oxide film show distinct colors; Adopt at last Ni2+, F-cold seal hole technique, with the fenestra pore closure of the porous oxide film that generates after the anodic oxidation, anti-pollution, the against corrosion and wear resisting property of oxide film is strengthened;
(7) electrophoretic painting
To carry out low-temperature plasma jet through the surface of the aluminium alloy extrusions of anode oxidation coloration first and process, and put it in the electrophoresis chamber again, energising makes Resins, epoxy be attached to Surface of profile;
(8) oven dry
The section bar that is painted with lacquer is fed into drying shed, dried 30-40 minute, temperature is 160-180 ℃, dries namely to get the present invention's 2024 aluminium alloy extrusions after complete.
Described modified coal ash is made by following method: the flyash after the calcination is successively placed 20-25% sulfuric acid, 16-24% sodium hydroxide solution successively, stir 20-22h, then the flyash that from the soda acid immersion liquid, leaches, extremely neutral with deionized water rinsing, and determined with PH test paper test, filter at last, dry, then by flyash: wollastonite powder: ground dolomite weight ratio 1:0.3-0.5:0.5-0.8 with three kinds of materials send in the fluidized-bed 1050-1100 ℃ roasting 1-1.5 hour, grind to form nanometer powder after the cooling.
Beneficial effect of the present invention is as follows:
The present invention adopts anodic oxidation treatment and electrophoretic painting method to improve its resistance to corrosion.
Added the aluminium scrap material in the feed proportioning of the present invention, because the aluminium scrap material is through primary smelting, its stable components, increase aluminium scrap material is conducive to the aluminium section bar stable performance in the prescription so do not invent, and appearance does not have the possibility of the Effect of Materials aluminium section bar quality of detection when having reduced the smelting of aluminium liquid; Adjust the usage ratio of relevant composition in the aluminium prescription, further optimize filling a prescription, increased intensity and the hardness of aluminium alloy, be conducive to improve the over-all properties of aluminium alloy extrusions; The steps such as anneal, quench treatment, alignment processing have increased the homogeneity of interior tissue of aluminum and the refinement of crystal grain, have greatly improved quality and the processing characteristics of aluminium alloy extrusions; Aluminium shape surface is carried out Cement Composite Treated by Plasma, increased the stability of japanning.
Description of drawings
Fig. 1 is heat-tinting electrophoretic painting 2024 aluminium alloy extrusions production-line technique schemas.
Fig. 2 is heat-tinting treatment process process flow sheet.
Embodiment
The invention will be further described below in conjunction with executing example, but be not limited to the following example.
Embodiment 1
(1) aluminium ingot and other feed proportioning
By following raw materials in part by weight: the aluminium section bar waste product of 70 parts of aluminium ingots, 30 parts of recovery and other aluminium scrap, 8 parts of modified coal ashs carry out proportioning;
(2) melting and casting aluminum alloy round ingot
First with aluminium ingot, the aluminium section bar waste product that reclaims and other aluminium scrap drop into smelting furnace and carry out melting, when treating that it becomes molten state, add modified coal ash, make it uniformly dispersing, then drop into an amount of AlTiC grain-refining agent and carry out refining, by adding alloying element, so that wherein the quality percentage composition of each element is: Si≤0.5%, Mg 1.2-1.8%, Fe≤0.50%, Cu≤3.8-4.9%, Mn 0.30-1.0%, Cr≤0.10%, Zn≤0.25%, Ti≤0.15%, other elements add up to≤0.15%, all the other are that Al is at last by degasification, skim the assorted slag in the melt, gas is effectively removed;
(3) casting and sawing
Before the casting melted aluminium liquid was left standstill 25 minutes, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;
(4) anneal
Carry out homogenizing annealing after the sawing of aluminium billet and process, detailed process is as follows: be warming up to first under 300 ℃, be incubated 2 hours, per hour 70 ℃ of intensifications are heated to 520 ℃ of lower insulations 6 hours, then air cooling, per hour 80 ℃ of intensifications are heated to 380 ℃ again, and insulation degree 5 hours; Be cooled to again 180 ℃ of lower insulations 3 hours;
(5) extrusion molding
Billet is heated to 450 ℃, is incubated 3 hours, the round casting rod extrusion molding from mould that then utilizes extrusion machine to heat, 240 ℃ of extrusion mould temperature, 10 m/mins of extrusion speeds; After the air-cooled section bar surface temperature to 120 ℃, put into 0 ℃ of water and carried out quench treatment 2 minutes, the water temperature backward wherein maintenance water temperature on the rocks that raises; Good aluminium alloy extrusions carried out normal temperature alignment processing to take out extruding at last from water, 130 ℃ of lower insulations 4 hours;
(6) heat-tinting is processed
At first aluminium alloy extrusions being carried out alkali cleaning processes, the sordid thing on surface is cleaned, then take aluminium alloy extrusions as anode, placed electrolytic solution to switch on, anode produces Sauerstoffatom, Sauerstoffatom has very strong oxidisability, generates the Al of one deck excellent property at aluminium alloy section surface
2O
3Protective layer, painted employing electrolytic colouring technology is filled into Al with nickel ion
2O
3In the protective layer, make oxide film show distinct colors; Adopt at last Ni2+, F-cold seal hole technique, with the fenestra pore closure of the porous oxide film that generates after the anodic oxidation, anti-pollution, the against corrosion and wear resisting property of oxide film is strengthened;
(7) electrophoretic painting
To carry out low-temperature plasma jet through the surface of the aluminium alloy extrusions of anode oxidation coloration first and process, and put it in the electrophoresis chamber again, energising makes Resins, epoxy be attached to Surface of profile;
(8) oven dry
The section bar that is painted with lacquer is fed into drying shed, dried 30 minutes, temperature is 180 ℃, dries namely to get the present invention's 2024 aluminium alloy extrusions after complete.
Described modified coal ash is made by following method: the flyash after the calcination is successively placed 20-% sulfuric acid, 20% sodium hydroxide solution successively, stir 20 h, then the flyash that from the soda acid immersion liquid, leaches, extremely neutral with deionized water rinsing, and determined at last filtration, drying with PH test paper test, then by flyash: wollastonite powder: ground dolomite weight ratio 1:0.4:0.8 sends three kinds of materials in the fluidized-bed 1100 ℃ of roastings 1 hour, grinds to form nanometer powder after the cooling.
After testing, the product chemical ingredients is: Si 0.494%, Mg 1.618%, Fe 0.346%, Cu 4.315%, Mn 0.658%, Cr 0.077%, Zn 0.124%, Ti 0.113%, other elements add up to 0.125%, all the other are Al; Mechanical property is: tensile strength is 436MPa, and yield strength is 284MPa; Surface property is: the local thickness 21 μ m of single-piece, oxide film sealing quality 19 mg/dm
2, sand trial wear factor 542 g/ μ m, drop alkali test 123s.
Embodiment 2
(1) aluminium ingot and other feed proportioning
By following raw materials in part by weight: the aluminium section bar waste product of 60 parts of aluminium ingots, 40 parts of recovery and other aluminium scrap, 10 parts of modified coal ashs carry out proportioning;
(2) melting and casting aluminum alloy round ingot
First with aluminium ingot, the aluminium section bar waste product that reclaims and other aluminium scrap drop into smelting furnace and carry out melting, when treating that it becomes molten state, add modified coal ash, make it uniformly dispersing, then drop into an amount of AlTiC grain-refining agent and carry out refining, by adding alloying element, so that, wherein the quality percentage composition of each element is: Si≤0.5%, Mg 1.2-1.8%, Fe≤0.50%, Cu≤3.8-4.9%, Mn 0.30-1.0%, Cr≤0.10%, Zn≤0.25%, Ti≤0.15%, other elements add up to≤0.15%, all the other are Al, at last by degasification, skim the assorted slag in the melt, gas is effectively removed;
(3) casting and sawing
Before the casting melted aluminium liquid was left standstill 30 minutes, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;
(4) anneal
Carry out homogenizing annealing after the sawing of aluminium billet and process, detailed process is as follows: be warming up to first under 320 ℃, be incubated 3 hours, per hour 90 ℃ of intensifications are heated to 550 ℃ of lower insulations 8 hours, then air cooling, per hour 80 ℃ of intensifications are heated to 380 ℃ again, and insulation degree 6 hours; Be cooled to again 150 ℃ of lower insulations 4 hours;
(5) extrusion molding
Billet is heated to 460 ℃, is incubated 3 hours, the round casting rod extrusion molding from mould that then utilizes extrusion machine to heat, 240 ℃ of extrusion mould temperature, 12 m/mins of extrusion speeds; After the air-cooled section bar surface temperature to 120 ℃, put into 0 ℃ of water and carried out quench treatment 2 minutes, the water temperature backward wherein maintenance water temperature on the rocks that raises; Good aluminium alloy extrusions carried out normal temperature alignment processing to take out extruding at last from water, 120 ℃ of lower insulations 4 hours;
(6) heat-tinting is processed
At first aluminium alloy extrusions being carried out alkali cleaning processes, the sordid thing on surface is cleaned, then take aluminium alloy extrusions as anode, placed electrolytic solution to switch on, anode produces Sauerstoffatom, Sauerstoffatom has very strong oxidisability, generates the Al of one deck excellent property at aluminium alloy section surface
2O
3Protective layer, painted employing electrolytic colouring technology is filled into Al with nickel ion
2O
3In the protective layer, make oxide film show distinct colors; Adopt at last Ni2+, F-cold seal hole technique, with the fenestra pore closure of the porous oxide film that generates after the anodic oxidation, anti-pollution, the against corrosion and wear resisting property of oxide film is strengthened;
(7) electrophoretic painting
To carry out low-temperature plasma jet through the surface of the aluminium alloy extrusions of anode oxidation coloration first and process, and put it in the electrophoresis chamber again, energising makes Resins, epoxy be attached to Surface of profile;
(8) oven dry
The section bar that is painted with lacquer is fed into drying shed, dried 40 minutes, temperature is 180 ℃, dries namely to get the present invention's 2024 aluminium alloy extrusions after complete.
Described modified coal ash is made by following method: the flyash after the calcination is successively placed 20-% sulfuric acid, 20% sodium hydroxide solution successively, stir 20 h, then the flyash that from the soda acid immersion liquid, leaches, extremely neutral with deionized water rinsing, and determined at last filtration, drying with PH test paper test, then by flyash: wollastonite powder: ground dolomite weight ratio 1:0.4:0.8 sends three kinds of materials in the fluidized-bed 1100 ℃ of roastings 1 hour, grinds to form nanometer powder after the cooling.
After testing, the product chemical ingredients is: Si 0.431%, Mg 1.424%, Fe 0.326%, Cu 4.257%, Mn 0.542%, Cr 0.632%, Zn 0.212%, Ti 0.113%, other elements add up to 0.132%, all the other are Al; Mechanical property is: tensile strength is 442MPa, and yield strength is 302MPa; Surface property is: the local thickness 23 μ m of single-piece, oxide film sealing quality 20 mg/dm
2, sand trial wear factor 551 g/ μ m, drop alkali test 128s.
Claims (2)
1. the production method of heat-tinting electrophoretic painting aluminium alloy extrusions, it is characterized in that, comprise the steps such as aluminium ingot and other feed proportioning, melting and casting aluminum alloy round ingot, casting and sawing, anneal, extrusion molding, heat-tinting processing, electrophoretic painting, oven dry, concrete steps are as follows:
(1) aluminium ingot and other feed proportioning
By following raw materials in part by weight: aluminium section bar waste product and other aluminium scrap, 5-10 modified coal ash that 60-70 aluminium ingot, 30-40 reclaim carry out proportioning;
(2) melting and casting aluminum alloy round ingot
First with aluminium ingot, the aluminium section bar waste product that reclaims and other aluminium scrap drop into smelting furnace and carry out melting, when treating that it becomes molten state, add modified coal ash, make it uniformly dispersing, then drop into an amount of AlTiC grain-refining agent and carry out refining, by adding alloying element, so that wherein the quality percentage composition of each element is: Si≤0.5%, Mg 1.2-1.8%, Fe≤0.50%, Cu≤3.8-4.9%, Mn 0.30-1.0%, Cr≤0.10%, Zn≤0.25%, Ti≤0.15%, other elements add up to≤0.15%, all the other are that Al is at last by degasification, skim the assorted slag in the melt, gas is effectively removed;
(3) casting and sawing
Before the casting melted aluminium liquid was left standstill 20-30 minute, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;
(4) anneal
Carrying out homogenizing annealing after the sawing of aluminium billet processes, detailed process is as follows: be warming up to first under 300-320 ℃, be incubated 2-3 hour, per hour 70-90 ℃ of intensification is heated to 520-550 ℃ of lower insulation 6-8 hour, then air cooling, per hour 60-80 ℃ of intensification is heated to 360-380 ℃ again, and insulation degree 5-6 hour; Be cooled to again 150-180 ℃ of lower insulation 3-4 hour;
(5) extrusion molding
Billet is heated to 450-460 ℃, is incubated 2-3 hour, the round casting rod extrusion molding from mould that then utilizes extrusion machine to heat, 220-240 ℃ of extrusion mould temperature, extrusion speed 10-12 m/min; Air-cooled section bar surface temperature is put into 0-5 ℃ of water and was carried out quench treatment 1-2 minute after 110-130 ℃, the backward wherein maintenance water temperature on the rocks of water temperature rising; Good aluminium alloy extrusions carried out normal temperature alignment processing to take out extruding at last from water, 120-130 ℃ of lower insulation 3-4 hour;
(6) heat-tinting is processed
At first aluminium alloy extrusions being carried out alkali cleaning processes, the sordid thing on surface is cleaned, then take aluminium alloy extrusions as anode, placed electrolytic solution to switch on, anode produces Sauerstoffatom, Sauerstoffatom has very strong oxidisability, generates the Al of one deck excellent property at aluminium alloy section surface
2O
3Protective layer, painted employing electrolytic colouring technology is filled into Al with nickel ion
2O
3In the protective layer, make oxide film show distinct colors; Adopt at last Ni2+, F-cold seal hole technique, with the fenestra pore closure of the porous oxide film that generates after the anodic oxidation, anti-pollution, the against corrosion and wear resisting property of oxide film is strengthened;
(7) electrophoretic painting
To carry out low-temperature plasma jet through the surface of the aluminium alloy extrusions of anode oxidation coloration first and process, and put it in the electrophoresis chamber again, energising makes Resins, epoxy be attached to Surface of profile;
(8) oven dry
The section bar that is painted with lacquer is fed into drying shed, dried 30-40 minute, temperature is 160-180 ℃, dries namely to get the present invention's 2024 aluminium alloy extrusions after complete.
2. the production method of heat-tinting electrophoretic painting aluminium alloy extrusions according to claim 1, it is characterized in that, described modified coal ash is made by following method: the flyash after the calcination is successively placed 20-25% sulfuric acid successively, in the 16-24% sodium hydroxide solution, stir 20-22h, then the flyash that from the soda acid immersion liquid, leaches, extremely neutral with deionized water rinsing, and determined with PH test paper test, filter at last, dry, then by flyash: wollastonite powder: ground dolomite weight ratio 1:0.3-0.5:0.5-0.8 with three kinds of materials send in the fluidized-bed 1050-1100 ℃ roasting 1-1.5 hour, grind to form nanometer powder after the cooling.
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