CN106521268B - A kind of consumer electronics shell aluminium alloy and its preparation method and application - Google Patents
A kind of consumer electronics shell aluminium alloy and its preparation method and application Download PDFInfo
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- CN106521268B CN106521268B CN201611270251.7A CN201611270251A CN106521268B CN 106521268 B CN106521268 B CN 106521268B CN 201611270251 A CN201611270251 A CN 201611270251A CN 106521268 B CN106521268 B CN 106521268B
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
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- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- 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
- C22F1/047—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 with magnesium as the next major constituent
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Abstract
The invention discloses a kind of consumer electronics shell aluminium alloys and its preparation method and application.Consumer electronics shell aluminium alloy includes following component by mass percentage：Si is that 0.38~0.48%, Mg is 0.55~0.70%, Fe≤0.12%, Mn≤0.03%, Cr≤0.03%, and Cu is 0.10~0.30, Zn≤0.03%, Ti≤0.10%, other impurities total amount ＜ 0.15%, surplus Al；Wherein, Mn+Cr≤0.05%, Si≤Mg/1.732+0.08%.Alloy of the present invention is after T6 is handled, and it is single perfect recrystallization fine grained texture to have higher hardness and good mechanical property, extruding base material metallographic structure, has excellent anodic oxidation performance, suitable for making consumer electronics shell.
Description
Technical field
The invention belongs to aluminum alloy materials and its manufacturing field, more particularly to a kind of consumer electronics shell aluminium alloy and
Preparation method and application.
Background technology
With the extensive use of intelligent mobile phone, tablet computer, consumer wants high-end consumer electronics except having function
It asks outer, appearance/texture is required higher and higher.Al-alloy metal structural member has become one of consumer electronics shell standard configuration.
Currently on the market, the shell of consumer electronics have die cast, Strip can direct punch forming, squeeze base material
The various ways such as CNC machine-shapings.Wherein die cast product machining amount is big, and compression casting waste material is oxidizable and impurity content
More, forming process easy tos produce many defects, improves the production cost of product.And use the direct punch forming of Strip because of strip
There is apparent incomplete recrystallized tissue, occur a large amount of strain lines after anodic oxidation, influence appearance in the stretching of material aximal deformation value
Effect.The consumer electronics shell of only a small number of Low Tier Brands is using at present.It is more in the integrated shelling machine of high-end product
Using the extrusion plate of thickness (>=6mm), anodized obtains after CNC is processed.
Therefore, it is necessary to select suitable al alloy component and meet high-end electronic appearance member using rational preparation method
The requirement on high surface.It has to solve three critical issues：The intensity requirement in the service life period must fully be met；Surface
It allows for reaching decorative effect requirement after anodic oxidation, no material line, aoxidizes the defects of rear surface aberration gloss differs at black line；
CNC and injection molding anteroposterior dimension and dimensionally stable.
In the prior art, generally use National Standard of the People's Republic of China GB/T3190-2008《Deform aluminium and aluminium alloy
Chemical composition》Specified in the aluminium alloy of the trade mark 6063 squeeze consumer electronics shell aluminium section bar.By mass fraction percentage
Than meter, the aluminium alloy standard of the trade mark 6063：Mg：0.45~0.90%；Cu：0.10%；Si：0.20~0.60%；Zn：
0.10%；Mn：0.10%；Fe：0.35%；Cr：0.10%；Ti：0.10%；Surplus is Al.Due to national standard wider range, performance
It is widely different.When Si, Mg lower bound, mechanical property is all relatively low, specially tensile strength (MPa) >=210Mpa；Yield strength
(MPa)≥180Mpa；Elongation percentage (%) >=10%；Vickers hardness (HV) >=65；When Si, Mg high prescribe a time limit, mechanical property is higher, tool
Body is：Tensile strength (MPa) >=270Mpa；Yield strength (MPa) >=230Mpa；Elongation percentage (%) >=80%；Vickers hardness
(HV) >=90, but after client's CNC processing anodized lines on surface is high apparent, cannot meet customer need.
Invention content
The primary purpose of the present invention is that the shortcomings that overcoming the prior art and deficiency, provide a kind of consumer electronics shell use
Aluminium alloy.
Another object of the present invention is to provide the preparation methods of the consumer electronics shell aluminium alloy.
Another object of the present invention is to provide the application of the consumer electronics shell aluminium alloy.
The purpose of the invention is achieved by the following technical solution：A kind of consumer electronics shell aluminium alloy, including following
Component by mass percentage：It is 0.55~0.70%, Fe≤0.12% that Si, which is 0.38~0.48%, Mg, Mn≤0.03%,
Cr≤0.03%, Cu are 0.10~0.30%, Zn≤0.03%, and Ti≤0.10%, other impurities total amount ＜ 0.15%, surplus is
Al；Wherein, (i.e. surplus Si total amounts (mass percent) control exists by Mn+Cr≤0.05%, Si≤Mg/1.732+0.08%
Within 0.08%).
The consumer electronics shell preferably comprises following component by mass percentage with aluminium alloy：Si is 0.43
~0.46%, Mg are 0.62~0.68%, Fe≤0.11%, Mn≤0.02%, Cr≤0.03%, and Cu is 0.20~0.28%,
Zn≤0.01%, Ti≤0.10%, other impurities total amount ＜ 0.15%, surplus Al, wherein Si≤Mg/1.732+0.08%.
A kind of preparation method of consumer electronics shell aluminium alloy, includes the following steps：
(1) it stocks up according to above-mentioned mass percent, wherein aluminium and magnesium use aluminium ingot and magnesium ingot；
(2) aluminium ingot is packed into smelting furnace, is heated to 730~760 DEG C and is melted, added magnesium ingot and intermediate alloy carries out
Alloying obtains aluminum melt A；
(3) refining agent is added into aluminum melt A, is refined in 730~750 DEG C, while refining into aluminum melt A
It is passed through refinery gas to be stirred, be vented, skim, obtains aluminum melt B；
(4) melt B is stood, obtains aluminum melt C；
(5) aluminum melt C is cast, casting temperature is controlled at 680~710 DEG C, obtains alloy circle ingot casting；
(6) 7 hours are kept the temperature after obtained alloy circle ingot casting being heated to 565 ± 5 DEG C, then is cooled to room temperature by force with water mist, is obtained
To consumer electronics shell aluminium alloy.
Intermediate alloy described in step (2) is preferably AlSi12 and AlCu40.
Smelting furnace described in step (2) is preferably heat storing type energy-saving stove.
The temperature of fusing described in step (2) is preferably 750 DEG C.
The additive amount of refining agent described in step (3) is calculated by 2kg/ tons of aluminum melt A.
The temperature refine described in step (3) is preferably 740 DEG C, the preferably 40 minutes time of refining.
Refinery gas described in step (3) is preferably high-purity argon gas.
The pressure of the argon gas is 0.05~0.1Mpa, and flow is 12L/ minutes.
The aluminum melt B that obtains described in step (3) further includes the steps that trimming：The aluminum melt Bization that will be obtained
Learn constituent analysis, if alloying component not described in step (1) in the range of, by trimming, alloying component is controlled
In range described in step (1).
The aluminum melt C that obtains described in step (4) further includes the steps that purification.
Aluminum melt C is preferably passed sequentially through depassing unit for the purification and double-stage filtering system purifies.
The depassing unit is preferably box depassing unit.
The double-stage filtering system is preferably 80 mesh foamed ceramic filter plates and RC tubular filters.
The time of standing described in step (4) is 25~40 minutes, preferably 40 minutes.
The method of casting described in step (5) is preferably semicontinuous water cooling casting method.
The temperature of casting described in step (5) is preferably 685~710 DEG C.
Heating described in step (6) carries out in homogenizing heat-treatment furnace.
Application of the consumer electronics shell aluminium alloy in preparing consumer electronics shell aluminum alloy base material.
A kind of consumer electronics shell aluminum alloy base material, includes the following steps：
It is heated 1. above-mentioned consumer electronics shell is fitted into aluminium alloy in aluminium bar pot arch；
2. the aluminium alloy after heating is packed into extruder again to squeeze；
3. carrying out press quenching after squeezing, aluminum alloy materials are obtained；
4. aluminum alloy materials are carried out tension straingtening；
5. carrying out artificial aging technique.
Step 1. described in consumer electronics shell aluminium alloy further include the steps that sawing, alloy is sawed into properly
Length, preferably 635~740mm.
Step 1. described in aluminium bar pot arch be preferably three area's heating modes aluminium bar pot arch, an area (entrance preheat
Area) temperature be 500~530 DEG C, 2nd area (moderate soak area) temperature be 540~560 DEG C, 3rd area (outlet area) temperature be 500~
560℃；Four area Shi Huo, five area's formulas can also be used in the aluminium bar pot arch, wherein and entrance preheating zone temperature is 500~530 DEG C,
Outlet area temperature is 500~560 DEG C, and interlude is heat preservation zone, and temperature setting is 540~560 DEG C.
The temperature of the entrance preheating zone is preferably 500 DEG C.
The temperature in the moderate soak area is preferably 550 DEG C.
The temperature of the outlet area is preferably 530~550 DEG C.
Step 1. described in time of heating be preferably 2~5 hours.
Step 2. described in extruding temperature be 500~560 DEG C；The speed (master cylinder forward speed) of extruding be 1.5~
3.0mm/s, preferably 2.0~3.0mm/s；Extrusion ratio (extrusion coefficient λ) is more than 50, preferably 53~66.
Step 3. described in the method for press quenching be preferably achieved by the steps of：By water temperature 10 in 15S
~50 DEG C of sink.
Step 3. described in the cooling rate of press quenching be preferably 40 DEG C/s.
Step 4. described in stretching preferably stretched using stretching-machine, realize material aligning simultaneously material removal it is residual
Residue stress.
Step 4. described in the amount of tension of progress tension straingtening be preferably 1~3%.
Step 5. described in the condition of artificial aging technique be：170 ± 5 DEG C keep the temperature 10 hours.
A kind of consumer electronics shell includes the metal-back made with the consumer electronics shell aluminum alloy base material
Body.
To improve alloy underlying strength, it is necessary to properly increase alloy strengthening phase Mg2Si contents, the present invention in Si be 0.38~
0.48%, Mg are 0.55~0.70%, Mg2Si contents control between 0.87~1.10%；Cu elements have solid solution strengthening effect,
Its content 0.10~0.30% is controlled in the present invention, to ensure available HV100 or more hardness after alloy T6 processing, meanwhile, it is
Keep the penetrating limpid feature of oxidation film, the stringent content for controlling impurity.The current potential (- 0.76V) of Zn compared with Al current potential (-
1.67V) just, the larger corrosion current caused in micro cell of the potential difference of the two is very big, and oxidation film is easy to happen dot etching, therefore
Its content must be controlled and be less than 0.03%.Alloy recrystallization temperature can be improved in Fe, is conducive to generate fibrous crystal tissue when hot-working；
Meanwhile phase containing Fe forms liquid solution at a temperature of aluminium alloy smelting, solid solubility very little at room temperature, mainly with insoluble or indissoluble
The form of the brittlement phases such as AlFeMnSi and cocrystalization compound exists.It is anti-that Copper component particle in follow-up anodic attack process belongs to cathode
It answers, can be etched around particle and it is made to fall, form about 2~10 μm of size etch pits, diffusing reflection occurs under light illumination,
Visually compared with mist and secretly, therefore its content must be controlled and be less than 0.12%.Shape can be precipitated in high-temperature heating process in Mn simultaneously, Cr elements
At MnAk6 CrAl7 compounds, hinder Recrystallization nucleation and to grow up, fibrous crystal promoted to be formed.And fibrous crystal anodized
Products appearance has apparent lines sense afterwards, seriously affects visual effect.Si in alloy in addition to Mg with 1.732：1 ratio
It is formed outside reinforceing phase Mg2Si, if superfluous just form free Si, Al-Fe-Si phase, these particles are easily in grain boundaries segregation, in corruption
It loses under medium, constitutes in spot corrosion source the design, management and control surplus Si≤0.08%.
In order to obtain uniform penetrating limpid anode surface quality, after squeeze wood processed (CNC, grinding, sandblasting), surface layer
It organizes grain size uniform, by ASTM E112 standards, controls 4-5 grades of grain size.To improve processing procedure yields, aluminium alloy is controlled
The total Slag inclusion content PoDFA of ingot casting is less than 0.12mm2/ Kg, and carry out surface heat peeling processing, removal casting after squeezing ingot casting heating
Ingot surface is segregated layer.
The present invention has the following advantages and effects with respect to the prior art：
1, selection is in the alloying component of signified scope of the present invention, and by manufacturing method proposed by the present invention, resulting materials are overall
It is characterized as：For squeeze wood after T6 is handled, hardness is more than 20% or more of the HV80-90 of common 6063-T6 up to HV100-115；
Slag inclusion overall control PoDFA is less than 0.12mm in extruding ingot material2/ Kg, oxidation film number are controlled in 10Max/kg；It squeezes
Pressure material metallographic structure is single perfect recrystallization fine grained texture, and grain size is at 3 grades or more；After anodic oxidation there is no material line,
The defects of black line, oxidation rear surface aberration gloss differ.
Description of the drawings
Fig. 1 is the process flow chart of consumer electronics shell aluminium alloy of the present invention.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment 1
Raw material
Aluminium ingot：Use the trade mark for the aluminium ingot of Al99.7, the mass percent of Al is the matter of 99.70% or more, Fe in aluminium ingot
Percentage is measured within 0.08%, complies with standard GB/T 1196-2008《Remelting aluminium ingot》；
Magnesium ingot：Use the trade mark for the magnesium ingot of Mg9990, the mass percent of Mg is 99.9% or more in magnesium ingot, is complied with standard
GB/T 3499-2003《Primary magnesium ingot》；
Alloy addition (aluminium silicon)：Using AlSi12 intermediate alloys, quality meets YS/T282-2000 standards；
Aluminum bronze：Using AlCu40 intermediate alloys, quality meets YS/T282-2000 standards；
Refining agent：It uses the trade mark for the granular refining agents of PROMAG RI, complies with standard YS/T491-2005《Deform aluminium and aluminium
Alloy flux》；
Refinery gas：Using high-purity argon gas, purity, that is, percentage by volume is >=99.999%；
Melting online processing gas：Using high-purity argon gas, purity, that is, percentage by volume is >=99.999%；
Raw material is put into order and carries out heating smelting in heat storing type energy-saving stove, fuel uses natural gas, technique stream
Journey is as shown in Figure 1, be as follows：
1, the manufacturing method of aluminium alloy round cast ingot：
(1) raw material prepare：Determine each ingredient by mass percentage：Si is 0.43%, Mg 0.62%, and Fe is
0.10%, Mn 0.01%, Cu 0.20%, Cr 0.01%, Zn 0.01%, Ti≤0.10%, surplus are that Al progress is standby
Material；
(2) shove charge：Aluminium ingot in above-mentioned raw materials is packed into smelting furnace (heat storing type energy-saving stove)；
(3) heating fusing：In-furnace temperature is controlled at 750 DEG C, aluminium ingot is made to be completely melt to become aluminum melt I；
(4) alloying：Above-mentioned magnesium ingot and intermediate alloy are added into aluminum melt I, and stirring makes its fusing, melt is carried out
Preliminary alloying obtains aluminum melt II；
(5) it refines：Refining agent is added in the aluminum melt II that step (4) obtains, dosage is 2kg/ tons of aluminum melt II, refining
Temperature be 740 DEG C, refining time be 40 minutes, refining process by obtained aluminum melt carry out chemical composition analysis, if alloy at
Divide in the not range described in step (1), then by trimming, by alloying component control in the range described in step (1)；
It is passed through high-purity argon gas into aluminum melt by furnace bottom air brick while refining to be stirred, be vented, then skims, it is molten to obtain aluminium
Body III, wherein argon pressure is controlled in 0.05~0.1MPa, and flow control was at 12L/ minutes；
(6) alloy component analysis：The melt III obtained after being refined to step (5) carries out alloying element analysis, alloying component
Not in the range described in step (1), then by trimming, by alloying component control in the range described in step (1)；
(7) stewing process：Aluminum melt III is stood 40 minutes, obtains aluminum melt IV；
(8) online degasification：Dehydrogenation is carried out using depassing unit, aluminum melt IV hydrogen contents are controlled in 0.15ml/100g.Al
Below aluminium；
(9) on-line filtration：It is purified using double-stage filtering system, that is, uses 80 mesh foamed ceramic filter plates and RC tubular types
Filter is filtered；
(10) it casts：Using semicontinuous water cooling casting method, casting temperature is controlled at 685~710 DEG C, and casting obtains aluminium alloy
Circle ingot casting；
(11) Homogenization Treatments：It is heated up to 565 ± 5 DEG C in homogenizing heat-treatment furnace and keeps the temperature 7 hours, it is then fast with water mist
Speed is cooled to room temperature, and obtains consumer electronics shell aluminium alloy round cast ingot.
2, aluminium extrusion profile material manufacturing method：
(1) aluminium alloy round cast ingot obtained above (aluminium bar) is cut into 635mm long, is heated using aluminium bar pot arch at a slow speed,
500 DEG C of one area (entrance preheating zone) temperature, 550 DEG C of 2nd area (moderate soak area) temperature, 540 DEG C of 3rd area (outlet area) temperature add
Warm 2 hours (from the inlet to the outlet)；
(2) aluminium alloy round cast ingot loading extruder is squeezed, design aluminium alloy round cast ingot enters extruder ingot-containing tube
Preceding temperature is 510~520 DEG C, extrusion ratio (extrusion coefficient：The cross sectional area of barrel chamber is squeezed with the total cross sectional area of extruded product
The ratio between) it is 53, extrusion speed (master cylinder forward speed) is 2.0mm/s, and it is 500~550 DEG C to squeeze outlet temperature；
(3) after die orifice comes out, the sink in 15S by water temperature at 10~50 DEG C, cooling velocity reaches alloy product
40 DEG C/S or more, alloy material is made to realize press quenching；
(4) stretcher strain amount：Alloy material is stretched using stretching-machine, amount of tension is controlled 1~3%, wherein squeezing
The head 1.0% for going out workpiece squeezes out the tail portion 1.7% of workpiece, realizes material aligning material removal residual stress simultaneously；
(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.
Embodiment 2
1, aluminium justifies ingot casting manufacturing method：
According to Al-Mg-Si alloy (consumer electronics shell aluminium alloy) chemical analysis by mass percentage：For Si
For 0.46%, Mg 0.68%, Fe 0.11%, Mn 0.02%, Cr 0.02%, Cu 0.28%, Zn 0.01%, Ti
≤ 0.10%, surplus is that Al stocks up, and aluminium alloy round cast ingot is obtained according to technique productions same as Example 1.
2, aluminium extrusion profile material manufacturing method：
(1) above-mentioned aluminium circle ingot casting (aluminium bar) is cut into 740mm long, is heated using aluminium bar pot arch at a slow speed, area's temperature 500
DEG C, two 550 DEG C of area's temperature, three 550 DEG C of area's temperature heat 5 hours (from the inlet to the outlet)；
(2) aluminium alloy round cast ingot loading extruder is squeezed, design aluminium alloy round cast ingot enters extruder ingot-containing tube
Preceding temperature is 510~520 DEG C, extrusion ratio 66, and extrusion speed (master cylinder forward speed) is 3.0mm/s, squeezes outlet temperature and is
500~560 DEG C；
(3) alloy product is after die orifice comes out, the sink in 15S by water temperature at 10~50 DEG C, cooling velocity 40
DEG C/S, so that alloy material is realized press quenching；
(4) stretcher strain amount：Material is stretched using stretching-machine, amount of tension is controlled 1~3%, wherein squeezing out work
The head 1.4% of part squeezes out the tail portion 2.6% of workpiece, realizes material aligning material removal residual stress simultaneously；
(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.
Embodiment 3
1, aluminium justifies ingot casting manufacturing method：
According to Al-Mg-Si alloy chemical analysis by mass percentage：Si is 0.43%, Mg 0.64%, and Fe is
0.09%, Mn 0.01%, Cr 0.03%, Cu 0.25%, Zn 0.004%, Ti≤0.10%, surplus are that Al progress is standby
Material, aluminium alloy round cast ingot is obtained according to technique productions same as Example 1.
2, aluminium extrusion profile material manufacturing method：
(1) above-mentioned aluminium circle ingot casting (aluminium bar) is cut into 700mm long, is heated using aluminium bar pot arch at a slow speed, area's temperature 500
DEG C, two 550 DEG C of area's temperature, three 530 DEG C of area's temperature heat 4 hours (from the inlet to the outlet)；
(2) aluminium alloy round cast ingot loading extruder is squeezed, design aluminium alloy round cast ingot enters extruder ingot-containing tube
Preceding temperature is 520~530 DEG C, extrusion ratio 55, and extrusion speed (master cylinder forward speed) is 2.0mm/s, squeezes outlet temperature and is
510~545 DEG C；
(3) product is after die orifice comes out, the sink in 15S by water temperature at 10~50 DEG C, and cooling velocity is 40 DEG C/S,
Material is set to realize press quenching；
(4) stretcher strain amount：Material is stretched using stretching-machine, amount of tension is controlled 1~3%, wherein squeezing out work
The head 1.5% of part squeezes out the tail portion 2.9% of workpiece, realizes material aligning material removal residual stress simultaneously；
(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.
Comparative example 1
1, aluminium justifies ingot casting manufacturing method：
According to Al-Mg-Si alloy chemical analysis by mass percentage：Si is 0.38%, Mg 0.48%, and Fe is
0.15%, Mn 0.05%, Cr 0.08%, Cu 0.08%, Zn 0.04%, Ti≤0.10%, surplus are that Al progress is standby
Material, aluminium alloy round cast ingot is obtained according to technique productions same as Example 1.
2, aluminium extrusion profile material is obtained by 1 identical technique productions of embodiment.
Comparative example 2
1, aluminium justifies ingot casting manufacturing method：
According to Al-Mg-Si alloy chemical analysis by mass percentage：Si is 0.45%, Mg 0.72%, and Fe is
0.18%, Mn 0.02%, Cr 0.02%, Cu 0.03%, Zn 0.01%, Ti≤0.10%, surplus are that Al progress is standby
Material, aluminium alloy round cast ingot is obtained according to technique productions same as Example 1.
2, aluminium extrusion profile material is obtained by 1 identical technique productions of embodiment.
Effect example
The aluminium alloy extruded profile material of consumer electronics shell made from Examples 1 to 3 and comparative example 1~2 are obtained
It obtains aluminium extrusion profile material and carries out following detection, condition of heat treatment T6：
1, according to GB/T 228.1-2010《Metal material stretching test part 1：Room temperature test method》Product is carried out
Mechanics Performance Testing；
2, according to GB/T 4340.1-2009《Vickers Hardness Test of Metallic Materials part 1：Test method》To product into
Row vickers hardness test.
3, GB/T 20503-2006 are pressed《Aluminium and aluminium alloy anode oxide anode oxide film specular reflectivity and bright luster
20 ° of the measurement of degree, 45 °, 60 °, 85 ° of angle directions》60 ° of mirror surface luster is carried out to product to measure.
The performance test results of above-mentioned five kinds of different aluminum alloys are as shown in table 1；Wherein, the measurement of surface gloss is by identical
CNC Lathe quantities, sandblasting, anodic oxidation condition.
1 different-alloy the performance test results of table
Note：R in tablemIndicate tensile strength (σb/Mpa)；Rp0.2Indicate yield strength (σ0.2/Mpa)；A50mmExpression, which is had no progeny, prolongs
Stretch rate (A50/ %).
Hardness is limpid penetrating after anodic oxidation up to HV105-113 after aluminium alloy prepared by the method for the present invention crosses T6 processing,
Without material line；It is processed at phone housing, in the phone housing of batch making, no material line, the lacunas such as piebald, black line meet high-end
The requirement on the high surface of electronic appearance part.
In comparative example 1, Mg2Si is 0.757%, Cu 0.08%, and alloy hardness after T6 is handled is HV65-69, firmly
It spends relatively low.Fe is 0.15%, and superfluous Si is 0.103%, falls to form etch pit in anodic oxidation corrosion process due to containing Fe phases,
Superfluous Si and Zn elements also may make up spot corrosion source, and anode is compared with mist and secretly.Due to Fe, Mn, Cr contents are higher, at anodic oxidation
Product has strain line sense after reason, and decorative effect is poor, cannot meet requirement of the consumer to electronic product appearance and texture.
In comparative example 2, Mg2Si is 1.199%, Cu 0.03%, and alloy hardness after T6 is handled is HV93-98, slightly
It is relatively low.Fe is 0.18%, and superfluous Si is 0.111%, falls to form etch pit in anodic oxidation corrosion process due to containing Fe phases, mistake
Surplus Si also may make up spot corrosion source, and anode is compared with mist and secretly.Decorative effect is poor, cannot meet consumer and be wanted to the height of electronic product appearance
It asks.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
1. a kind of consumer electronics shell aluminium alloy, which is characterized in that include following component by mass percentage：Si is
0.43~0.46%, Mg be 0.62~0.68%, Fe≤0.11%, Mn≤0.02%, Cr≤0.03%, Cu be 0.20~
0.28%, Zn≤0.01%, Ti≤0.10%, other impurities total amount ＜ 0.15%, surplus Al；Wherein, Si≤Mg/1.732+
0.08%；
The preparation of the consumer electronics shell aluminium alloy includes the following steps：
(1) it stocks up according to above-mentioned mass percent, wherein aluminium and magnesium use aluminium ingot and magnesium ingot；
(2) aluminium ingot is packed into smelting furnace, is heated to 730~760 DEG C and is melted, added magnesium ingot and intermediate alloy carries out alloy
Change, obtains aluminum melt A；
(3) refining agent is added into aluminum melt A, is refined in 730~750 DEG C, is passed through into aluminum melt A while refining
Refinery gas is stirred, is vented, skims, and obtains aluminum melt B；
(4) aluminum melt B is stood, obtains aluminum melt C；
(5) aluminum melt C is cast, casting temperature is controlled at 680~710 DEG C, obtains alloy circle ingot casting；Described is cast into
Semicontinuous water cooling casting；
(6) 7 hours are kept the temperature after obtained alloy circle ingot casting being heated to 565 ± 5 DEG C, then is cooled to room temperature by force with water mist, is disappeared
Take electronics shell aluminium alloy.
2. a kind of preparation method of consumer electronics shell aluminium alloy, which is characterized in that include the following steps：
(1) mass percent described in accordance with the claim 1 is stocked up, wherein aluminium and magnesium use aluminium ingot and magnesium ingot；
(2) aluminium ingot is packed into smelting furnace, is heated to 730~760 DEG C and is melted, added magnesium ingot and intermediate alloy carries out alloy
Change, obtains aluminum melt A；
(3) refining agent is added into aluminum melt A, is refined in 730~750 DEG C, is passed through into aluminum melt A while refining
Refinery gas is stirred, is vented, skims, and obtains aluminum melt B；
(4) aluminum melt B is stood, obtains aluminum melt C；
(5) aluminum melt C is cast, casting temperature is controlled at 680~710 DEG C, obtains alloy circle ingot casting；
(6) 7 hours are kept the temperature after obtained alloy circle ingot casting being heated to 565 ± 5 DEG C, then is cooled to room temperature by force with water mist, is disappeared
Take electronics shell aluminium alloy.
3. the preparation method of consumer electronics shell aluminium alloy according to claim 2, it is characterised in that：
The aluminum melt B that obtains described in step (3) further includes the steps that trimming：By obtained aluminum melt B carry out chemistry at
Point analysis, if not in the range described in step (1), by trimming, alloying component is controlled in step for alloying component
(1) in the range described in；
The aluminum melt C that obtains described in step (4) further includes the steps that purification：Aluminum melt C is passed sequentially through into depassing unit and double
Grade filtration system is purified.
4. the preparation method of consumer electronics shell aluminium alloy according to claim 2, it is characterised in that：
The additive amount of refining agent described in step (3) is calculated by 2kg/ tons of aluminum melt A；
Refinery gas described in step (3) is high-purity argon gas；
The temperature refined that carries out described in step (3) is 740 DEG C, the 40 minutes time of refining；
The time of standing described in step (4) is 25~40 minutes；
The method of casting described in step (5) is semicontinuous water cooling casting method.
5. consumer electronics shell aluminium alloy described in claim 1 is in preparing consumer electronics shell aluminum alloy base material
Application.
6. a kind of consumer electronics shell aluminum alloy base material, which is characterized in that include the following steps：
It is heated 1. consumer electronics shell described in claim 1 is fitted into aluminium alloy in aluminium bar pot arch；
2. the aluminium alloy after heating is packed into extruder again to squeeze；
3. carrying out press quenching after squeezing, aluminum alloy materials are obtained；
4. aluminum alloy materials are carried out tension straingtening；
5. carrying out artificial aging technique.
7. consumer electronics shell aluminum alloy base material according to claim 6, it is characterised in that：
Step 1. described in aluminium bar pot arch be three area's heating modes aluminium bar pot arch：Entrance preheating zone temperature be 500~
530 DEG C, moderate soak area temperature is 540~560 DEG C, and outlet area temperature is 500~560 DEG C；
Step 5. described in the condition of artificial aging technique be：170 ± 5 DEG C keep the temperature 10 hours.
8. consumer electronics shell aluminum alloy base material according to claim 6, it is characterised in that：
Step 1. described in heating time be 2~5 hours；
Step 2. described in the temperature of extruding be 500~560 DEG C, the speed of extruding is 1.5~3.0mm/s；
Step 3. described in press quenching cooling rate be 40 DEG C/s；
Step 4. described in progress tension straingtening amount of tension be 1~3%.
9. a kind of consumer electronics shell, it is characterised in that：Including with such as claim 6~8 any one of them consumer electronics
The metal shell that product shell makes of aluminum alloy base material.
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