Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
  • C22C21/04—Modified aluminium-silicon alloys
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
  • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
  • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
  • C25D11/02—Anodisation
  • C25D11/04—Anodisation of aluminium or alloys based thereon
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/1266—O, S, or organic compound in metal component
  • Y10T428/12667—Oxide of transition metal or Al

Definitions

• the invention relates to a decorative anodizable, well deformable and mechanically highly resilient aluminum alloy of the type AlMgSi, a semi-finished product of this alloy, in the form of tapes, sheets or extruded profiles and a made of the aforementioned semi-finished, in particular deformed and decorative anodized component.
• a process for producing such an aluminum alloy is also a process for producing such an aluminum alloy.
• Non-alloyed aluminum (1xxx alloys), AlMg alloys (5xxx alloys or clad 8xxx alloy cladding, unalloyed aluminum cladding (lxxx alloy) are generally used to produce decorative anodized aluminum sheet components not hardenable, ie an increase of the strength takes place exclusively by a cold work hardening, a reduction in consequence then by defrosting annealing.
• All of these systems have in common that their formability and their strength state by the Semi-finished delivery state, which may be either solidified by rolling or softened by a subsequent annealing, for example, is set. It is therefore possible in the sense of good formability to use these systems in a state of maximum softening and then reshape.
• the systems can be used in a high-strength condition, but the forming capacity for a forming step, due to the high initial strength of the delivery condition, is severely limited.
• Thermosetting AlMgSi alloys (6xxx) with good formability are for example from EP 0 714 993 respectively.
• EP 0 811 700 known.
• the disclosed AlMgSi alloys are also used for the production of tapes and sheets. Due to the good thermoformability, they are suitable for the production of body panels for the automotive industry.
• the alloy composition disclosed there achieves an optimum between good strength and good forming behavior.
• these alloys are not decorative, especially not high gloss, anodisierbar, since on the one hand in the EP 0 811 700
• the disclosed iron content of 0.25 to 0.55% by weight is too high and causes turbidity of the anodized layer.
• a known A199.9MgSi alloy (6401 special) for extruded profiles used by the Applicant for decorative components therefore contains no zirconium, vanadium or chromium. Likewise, the contamination of the AlMgSi alloy with iron is limited to 0.04 wt% iron. This ensures that the aforementioned anodizing errors are avoided and a high gloss size of the polished and gloss anodised component is achieved. Due to the lack of recrystallization inhibitors (Fe, Zr, Cr, V), however, such an alloy does not show optimal forming capacity, since the relatively coarse grain causes constrictions and orange peel at an early stage.
• the document EP-A-0 676 480 discloses an aluminum alloy having a composition of: 0.2 up to 2 Wt% silicon, 0.3 to 1.7 Wt% magnesium, 0 to 1.2 % By weight of copper, 0 to 1.1 Wt% manganese, 0.01 to 0.4 Chrome, at least one of the elements from the group 0.01 to 0.3 Wt% vanadium, 0.001 to 0.1 % By weight of beryllium, and 0.01 to 0.1 Wt% strontium,
• the invention has for its object to provide an aluminum alloy available for components that have good formability, which have sufficient strength and ductility in the application state and decorative decorative anodization.
• the alloy according to the invention is decorative anodizable and does not show a yellowish or cloudy anodized layer. This is effected by the proportion of 0.005 to 0.1% by weight of strontium. It is believed that the strontium alters the iron zirconium, chromium and / or vanadium-containing phases, in particular, to such an extent that, even when incorporated into the anodizing layer, they do not cause any visible haze. It has surprisingly been found that a weight ratio of iron to strontium 3: 1 to 5: proves to be particularly advantageous.
• Such an alloy is made of aluminum base material with more than 99.85 wt% aluminum.
• the alloying ingredients are added as follows, namely 0.3 to 0.9% by weight silicon, 0.1 to 0.5% by weight magnesium, wherein the weight ratio of silicon to magnesium is 1.8: 1 to 3.3: 1 is.
• the iron content of the aluminum base material which may be present as an impurity in the base material
• further iron is alloyed if necessary so that the alloy to be produced contains up to 0.2% by weight of iron.
• 0.005 to 0.1% by weight of strontium is added, with the weight ratio of iron to strontium being adjusted from 3: 1 to 5: 1. Preference is given to an addition of 0.008 to 0.07% by weight of strontium.
• 0.1 to 0.4% by weight of copper, 0.03 to 0.2% by weight of manganese, 0.01% by weight of titanium and zirconium and / or chromium and / or vanadium in total of 0.08 to 0.22 are used as further alloy constituents % By weight added.
• the alloy should contain no more than 0.04% by weight of zinc, not more than 0.02% by weight. unavoidable impurity individually or not more than 0.15% by weight in total. Furthermore, a certain amount, namely 0.0005 to 0.005% by weight of silver can be added to identify the alloy.
• the melt produced in this way is cast in a continuous casting process to form a rolling ingot or continuous casting bolt and then homogenized (annealing for at least 2 hours at at least 500 ° C.).
• the aluminum base material used is preferably pure aluminum with at least 99.85% by weight of aluminum in order to limit the proportion of impurities; overall, a content of not more than 0.15% by weight of unavoidable impurities should not be exceeded.
• the alloying ingredients may be added in the form of pure metals or master alloys.
• the strontium is preferably added in the form of an aluminum-strontium master alloy, in particular by means of an AlSr3.5 master alloy, an AlSr5 master alloy or an AlSr10 master alloy.
• From the homogenized continuous casting bolt of the aluminum alloy according to the invention can be obtained by extrusion open or hollow profile sections, which are stretched in the rule and assembled by sawing. From the profile pieces brought to the desired length can be produced by subsequent forming, in particular cold forming, such as rolling, bending, deep drawing or active media based sheet and tube forming, three-dimensionally shaped shell components. Regardless of whether the forming is a bending process, an active-medium-based forming or deep-drawing, the resulting component shows good contour accuracy with very little orange peel formation, caused by low springback. Due to the hardenability of the alloy, the strength and ductility can be adjusted after forming. After curing, in addition to possible mechanical processing, in particular a chemical and electrolytic treatment of the component follows.
• Such chemical and electrolytic treatment includes polishing, glazing, anodizing, eventually a coloring and a final compaction of the components.
• the resulting anodized layer of the decorative anodized shaped aluminum component is very satisfactory, it is transparent, ie not cloudy and not yellowish.
• From the ingot can be achieved by hot rolling sheet steel, which can be further processed by cold rolling and intermediate annealing.
• steps possibly recrystallization and / or Entfest Trentsglühung
• active media-based sheet metal forming including patterning and smoothing or roughening the surfaces and possibly re-annealing, optionally mechanical machining
• a shell component is formed, which also subsequently by chemical or electrolytic treatment with a decorative Eloxal Mrs can be provided.
• the aluminum alloy has a good to very good deformation behavior at room temperature with only slight orange peel formation, has a stable forming behavior and leads to a good contour accuracy of the component.
• the anodized coating shows no defects, on the contrary, even glossy surfaces can be realized if pure aluminum with at least 99.9% by weight aluminum is used as the base material.
• Table 1 shows high-strength AlMgSi alloys
• Table 2 medium-strength AlMgSi alloys
• Table 3 low-strength AlMgSi alloys.
• known comparative alloys are listed, including the applicant's AA6401-specialty alloy, a medium-strength AlMgSi alloy, which has been used for decorative applications, but does not show optimal forming behavior.
• the further comparative alloys provide optimum strength and deformation behavior, but are not decorative anodisable.
• An aluminum component was produced according to one of these process variants from an alloy according to the invention by continuous casting, homogenization, extrusion, stretching, cutting to length, deep drawing, polishing, glazing, anodizing.
• similarly shaped components made of a 6401 alloy and a 6016 alloy were produced by the same process.
• the properties of the components are shown in Table 5.
• the image sharpness was measured in various surface areas of the finished components. High image intensities are an expression of a high gloss and a high accuracy of an image, ie whether lines are displayed straight or distorted.
• the formability was listed as a comparative degree of deformation.
• the component according to the invention is the only component that exhibits a high image sharpness (80%) with good formability (40%).
• Admissible admixtures individually Permitted admixtures total A 2 0.8 0.2 0.4 0.2 0.4 0.2 0,010 Zr 0.1 Sr 0.04 0.02 0.15 B 3 0.9 0.2 0.4 0.2 0.3 0.2 0,010 Zr 0.1 Sr 0.04 0.02 0.15 C 2 0.8 0,040 0.10-0.15 0.03 0.4 - 0,010 Zr 0.1 Sr 0.01 0.02 0.15 D 3 0.9 0,040 0.10-0.15 0.03 0.3 - 0,010 Zr 0.1 Sr 0.01 0.02 0.15 % by weight description Si / Mg Si Fe Cu Mn mg Cr Ti Add. 1 Add.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Electrochemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Continuous Casting (AREA)
• Metal Rolling (AREA)
• Laminated Bodies (AREA)
• Extrusion Of Metal (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Powder Metallurgy (AREA)
• Forging (AREA)
• Eyeglasses (AREA)
• Adornments (AREA)
• Conductive Materials (AREA)
• Sliding-Contact Bearings (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2004
  • 2004-05-08 DE DE102004022817A patent/DE102004022817A1/de not_active Withdrawn
• 2005
  • 2005-04-30 DE DE502005007622T patent/DE502005007622D1/de active Active
  • 2005-04-30 CN CNB2005800146820A patent/CN100500905C/zh not_active Expired - Fee Related
  • 2005-04-30 RU RU2006143448/02A patent/RU2355801C2/ru not_active IP Right Cessation
  • 2005-04-30 US US11/579,520 patent/US20080318081A1/en not_active Abandoned
  • 2005-04-30 AT AT05759604T patent/ATE435310T1/de active
  • 2005-04-30 EP EP05759604A patent/EP1749112B1/de not_active Not-in-force
  • 2005-04-30 CA CA2563515A patent/CA2563515C/en not_active Expired - Fee Related
  • 2005-04-30 KR KR1020067025814A patent/KR100903249B1/ko not_active IP Right Cessation
  • 2005-04-30 JP JP2007513725A patent/JP4761275B2/ja not_active Expired - Fee Related
  • 2005-04-30 WO PCT/EP2005/004721 patent/WO2005108633A2/de active Application Filing
• 2006
  • 2006-12-07 NO NO20065655A patent/NO20065655L/no not_active Application Discontinuation

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