CN105039802A - Aluminum alloy plate and manufacturing method for the same - Google Patents
Aluminum alloy plate and manufacturing method for the same Download PDFInfo
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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
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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
- C22C1/10—Alloys containing non-metals
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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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- 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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- 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
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Abstract
The invention provides an aluminium alloy plate and a manufacturing method thereof. The aluminium alloy plate is capable of inhibiting emission of yellow colour to an utmost extent even being subjected to anodic oxidation treatment using a sulphuric acid bath, and of emitting colours of a light green-white system free of red. An alauminium alloy plate, in terms of mass percentage, contains 2.0-3.0% Mg, 0.15-0.25% Cr, 0.005-0.20% Ti, or 0.005-0.2% Ti and 0.005-0.05% B, and rest being Al and inevitable impurity, wherein Si in the impurity is in a proportion of 0.15% or lower, while Fe therein is 0.4% or lower, and Mn therein is 0.06% or lower; provided that the content of Cr is TCR% and the solid content of Cr is SCR%, PCR is equal to TCR minus SCR which is greater than or equal to 0.065%. A manufacturing method of an aluminium alloy plate comprises the following steps of: performing thermal rolling on a cast block formed by the aforementioned components after performing homogenization treatment thereon, and then performing cold rolling, and middle annealing by controlling a temperature rise/drop rate of 100 DEG or higher, and performing stabilized annealing by controlling the temperature rise/drop rate of 100 DEG or higher after the cold rolling.
Description
This case is the applying date
on March 3rd, 2011, application number is
201110052650.7, denomination of invention be "
aluminium alloy plate and manufacture method thereof" divisional application
Technical field
The present invention relates to aluminium alloy plate and manufacture method thereof that anode oxide film is pale green white.
Background technology
Al-Mg system alloy sheets carries out process annealing in its board making process, carries out cold rolling and anneal to give required mechanical characteristics.But, because after cold working, this is that alloy is naturally softening and intensity is unstable, so, as required, sometimes at cold rolling after-applied stabilizing annealing.
Aluminium alloy plate makes surface have the distinctive tone of alloy by utilizing sulfuric acid bath to carry out anodic oxidation treatment, is applied in motor electronic machines such as internal and external ornament panel for building, implements, family's electrical article, digital camera and PC etc.Such as, in non-heat treated alloy, the JIS5052 alloy sheets that residual deformation is few, working accuracy is high, in the anodic oxidation treatment utilizing sulfuric acid bath to carry out, sends yellowy tone.It is believed that the reason of this tone is the Cr in the alloy added in order to recrystallize grain miniaturization etc., do not wishing in yellowy situation, use the aluminium alloy plate not adding Cr.
Japanese Unexamined Patent Publication 9-143602 publication discloses containing as less than 0.02% Cr of impurity, Al-Mg system alloy sheets containing Mn0.10 ~ 0.30%.
Patent documentation 1: Japanese Unexamined Patent Publication 9-143602 publication
Summary of the invention
The invention provides a kind of Al-Mg system alloy sheets, be added with Cr in order to recrystallize grain miniaturization etc.But if containing Cr, then utilize sulfuric acid bath to carry out anodic oxidation treatment and it will be made to bring very strong yellow, can not obtain the aluminium alloy plate sending white color system color, the purposes of plate is restricted.
That is, the object of the present invention is to provide a kind of aluminium alloy plate and manufacture method thereof, even if this aluminium alloy plate carries out the anodic oxidation treatment utilizing sulfuric acid bath, also can do one's utmost to suppress to send yellow color, and send the color of not reddish pale green white color system.
The present inventor finds, generation yellow in the Al-Mg system alloy sheets containing Cr causes by comprising the Cr intermetallic compound that contains generated in the board making process of casting, thus complete the present invention.
That is, the present invention is following (1) ~ (4).
(1) a kind of aluminium alloy plate, it is characterized in that, the Cr of the Mg containing 2.0 ~ 3.0 quality %, 0.15 ~ 0.25 quality %, the Ti of the Ti of 0.005 ~ 0.20 quality % or 0.005 ~ 0.20 quality % and the B of 0.0005 ~ 0.05 quality %, rest part is Al and inevitable impurity, the Si in this impurity is made to be below 0.15 quality %, Fe is below 0.4 quality %, Mn is below 0.06 quality %, if the content of above-mentioned Cr is T
cRthe solid solution capacity of quality %, Cr is S
cRduring quality %, T
cR-S
cRvalue P
cRmeet P
cR≤ 0.065 quality %.
(2) possess an aluminium alloy plate for anode oxide film, it is characterized in that, the aluminium alloy plate described in above-mentioned (1) is coated with the sulphuric acid oxidation coating of 3 ~ 12 μm.
(3) a kind of manufacture method of aluminium alloy plate, it is characterized in that, to by above-mentioned (1) described form form ingot bar homogenize process after carry out hot rolling, carry out afterwards cold rolling after whole anneal in, make intensification and cooling rate be more than 100 DEG C/sec.
(4) possess a manufacture method for the aluminium alloy plate of anode oxide film, it is characterized in that, the aluminium alloy plate obtained by the method described in above-mentioned (3) covers the sulphuric acid oxidation coating of 3 ~ 12 μm.
That is, the invention provides: (1) is applicable to the aluminium alloy plate of sulphuric acid anodizing process, (2) possess the aluminium alloy plate of sulphuric acid oxidation coating, (3) are applicable to the manufacture method of the aluminium alloy plate of sulphuric acid anodizing process, (4) possess the manufacture method of the aluminium alloy plate of sulphuric acid oxidation coating.The effect of invention
Al-Mg system alloy sheets containing Cr of the present invention, by make containing Cr intermetallic compound amount be below prescribed value, even if cover the anode oxide film produced by sulfuric acid bath, also be do one's utmost to inhibit yellow and color development is the aluminium alloy plate of pale green white, therefore, the range of choice of tone expands, and having can in middle effects used such as the baskets of the motor electronic machines such as the internal and external ornament panel for building of preferred white system, implements, family's electrical article, digital camera and PC etc.In addition, the manufacture method of this alloy sheets is the technology application of degree rapidly by intensification cooling rate when making making sheet, has the effect that easily can provide the plate with above-mentioned effect.
Embodiment
The reason limiting chemical constitution in the present invention is described.
< Mg:2.0 ~ 3.0 quality % >
Mg is the principal element of JISA5xxx system alloy, is the element for just giving abundant intensity by means of only work hardening, and when being less than lower value, when being processed as panel, implements, intensity will be not enough, and in addition, if be greater than higher limit, plasticity is just not good enough.
The Al-Mg alloy only containing Mg is in anodic oxidation treatment in sulphuric acid electrolyte bath, and the tone color development on surface is light gray.
< Cr:0.15 ~ 0.25 quality % >
Cr be JISA5xxx system alloy when process annealing for the element by the miniaturization of recrystallize grain, when being less than lower value, its effect becomes not enough, in addition, if be greater than higher limit, even if then adopt manufacture method of the present invention, in anodic oxidation treatment, very strong yellow also can be brought and inappropriate.
< Ti:0.005 ~ 0.20 quality % > or
< Ti:0.005 ~ 0.20 quality % and B:0.0005 ~ 0.05 quality % >
Ti or Ti and B be for by cast structure's miniaturization, effectively prevent from casting time the ingot bar element that breaks, Ti can add separately, if but Ti and B compound is added, then can improve the miniaturization performance of cast structure, improve the performance preventing from breaking when casting.When respective content is less than lower value, micronized effect is few, the break-resistance degradation of ingot bar.If be greater than higher limit, the crystallization of the coarse InterMetallic Compound of Al-Ti or Ti-B will be separated out, the processibility of infringement plate and plasticity.The content of Ti or Ti and B can be added in Ti metal, Al-Ti mother alloy or Al-Ti-B by the selection and suitably selecting returning material one or more adjust.
The inevitable impurity > of <
Inevitable impurity refers to the element beyond alloying element Mg, Cr, Ti (or Mg, Cr, Ti and B) of interpolation intentionally, mean in common melting method, be difficult to avoid from feed metal, return the impurity that material, mother alloy and fixture etc. be mixed into.But, in the present invention, if the mixed volume of inevitable impurity becomes many, the distinctive color of this element will be sent, damage the color development that inhibit yellow pale green white as feature of the present invention, therefore need to limit.That is, to affect large Si be below 0.15 quality %, Fe be below 0.4 quality %, Mn is below 0.06 quality %.Other inevitable impurity, Zn is below 0.25 quality %, Cu is below 0.1 quality %, is preferably below 0.05 quality %.Other element is preferably each defined in below 0.05 quality %.
< T
cR-S
cR=P
cR≤ 0.065 quality % >
Here, T
cRthe content (quality %) of Cr, S
cRthe solid solution capacity (quality %) of Cr, P
cRcr amount (quality %) in intermetallic compound, with P
cR=T
cR-S
cRrepresent.
It is incident light containing Cr intermetallic compound that yellow it is believed that, such as, with Al
7cr, Al
11cr, Al
18cr
2mg
3reflect Deng on the compound represented, yellow wavelengths is presented very strong yellow by preferentially reflecting.
" analysis of solid solution Cr "
Al composition is dissolved, with the Cr in IPC luminescence analysis analytical solution, to solid solution Cr (S with hot phenol
cR) carry out quantitatively.Because can S be obtained by the method
cRvalue, so, can according to Cr content (T
cR) calculate T
cR-S
cR=P
cRvalue, namely can calculate Cr in intermetallic compound and measure (P
cRquality %).
" mechanism that yellow color development suppresses "
This P
cRvalue is the Cr amount existed as compound, P
cRvalue refers to that greatly the amount containing Cr compound is many, therefore, can think many by the light amount in yellow wavelengths preferentially reflected in incident light, thus present very strong yellow.This P can be investigated
cRif value is at below 0.065 quality %, then also few containing Cr compound amount, therefore, the light amount in yellow wavelengths is few, thus can inhibition zone yellow.
Then, the preferable production process of aluminium alloy plate of the present invention is described.
The preferable production process of invention comprises following operation.
< 1 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carries out final annealing process.
< 2 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carry out process annealing process, then carries out cold rolling, and carry out final annealing.Process annealing can be carried out repeatedly.
< 3 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carry out process annealing process, then carries out cold rolling.Process annealing process can be carried out repeatedly.
< 4 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carry out process annealing process, then carries out cold rolling, line stabilization annealing process of going forward side by side.Process annealing process can be carried out repeatedly.
< 5 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carries out modified anneal.
< 6 > homogenizes to ingot bar after process, carries out hot rolling, after after this cold rolling, carry out process annealing process, then carries out cold rolling, and carry out modified anneal after cold rolling.Process annealing process can be carried out repeatedly.
The aluminium alloy plate that the present invention is correlated with, be on the basis of the present invention's composition, the tone of anode oxide film is L
※value 75 ~ 95, a
※value-0.8 ~ 0, b
※the new aluminum alloy plate of value 0 ~ 2.0, its manufacturing condition does not limit, but in order to deepen the understanding of technical relation, illustrates its most preferred manufacturing process as follows.
Further illustrate the operation of < 1 >.
After the alloy molten solution of melting the present invention composition, by semicontinuous casting method (DC casting) etc., preferably by strainer casting, obtain rolling ingot bar.Preferably prune more than 5mm about 20mm in surface by this ingot bar, the uneven layer of removing ingot bar surface part, more than 440 ~ 560 DEG C of heating maintenance 1 ~ 24 hours or its, carries out homogenizing thermal treatment.When carry out multistage homogenize process, at least meet this temperature condition at hot stage.In this process, alleviate or eliminate β phase (Mg
2al
3) the local microsegregation of segregation, Cr in addition etc.
Then, be rolled with hot rolling, reach the thickness of about 2 ~ 10mm.In this course of hot rolling, alloying element is separated out as fine intermetallic compound, and in final annealing process, the miniaturization of recrystallize grain, makes form and aspect evenly neat in anodic oxidation treatment subsequently.
Further illustrate the operation of < 2 >.
The milled sheet of hot rolling is similarly finished with the operation of < 1 >, undertaken by usual method cold rolling and applying process annealing and make it softening and after becoming O material, determine that rolling rate is carried out cold rolling, make the plate of required thickness, then apply final annealing.Also repeatedly process annealing process can be applied.
Further illustrate the operation of < 3 >.
The milled sheet of hot rolling is similarly finished with the operation of < 1 >, undertaken by usual method cold rolling and applying process annealing and make it softening and after becoming O material, then, determine that rolling rate is carried out cold rolling, the mechanical characteristics required for imparting.Also repeatedly process annealing process can be applied.
Further illustrate the operation of < 4 >.
Because Al-Mg system alloy is naturally softening after cold working, intensity is unstable, so, when the material that will aspire for stability, in final cold rolling laggard line stabilization process.That is, similarly finish the milled sheet of hot rolling with the operation of < 1 >, undertaken by usual method cold rolling and applying process annealing and make it softening and after becoming O material, carry out finally cold rolling line stabilization annealing of going forward side by side.Also repeatedly process annealing process can be applied.
Further illustrate the operation of < 5 >.
If the known composition of Al-Mg system alloy and cold rolling rate, just can by determine cold rolling after heating condition predict mechanical properties, therefore, the milled sheet of hot rolling is similarly finished with the operation of < 1 >, undertaken by usual method cold rolling in determine that cold rolling rate is rolled, and carry out modified anneal after this rolling.
Further illustrate the operation of < 6 >.
If the known composition of Al-Mg system alloy and cold rolling rate, just can by determine cold rolling after heating condition predict mechanical properties, therefore, the milled sheet of hot rolling is similarly finished with the operation of < 1 >, undertaken by usual method cold rolling and applying after process annealing makes it to become O material, determine that cold rolling rate is rolled, and carry out modified anneal after this rolling.Also repeatedly process annealing process can be applied.
Intensification and the cooling rate condition of this process annealing, final annealing, stabilizing annealing and modified annealing are very important for obtaining tone of the present invention.That is, be to do one's utmost to suppress to separate out containing Cr intermetallic compound.Making the condition of this process annealing or final annealing for keeping 1 ~ 100 second 370 ~ 500 DEG C of temperature, making O material.During the process of process annealing laggard line stabilization annealing, according to giving the degree of intensity and different, after cold rolling, keeping 1 ~ 100 second the temperature of 150 ~ 250 DEG C, carrying out stabilizing annealing.
Determine cold rolling rate carry out cold rolling and after this rolling, carry out modified anneal time, according to final required mechanical properties, condition is different, after cold rolling, within 1 ~ 100 second, carries out modified anneal the temperature maintenance of 250 ~ 370 DEG C.
Here, the feature of manufacture method of the present invention is following (A) that must apply or (B) that apply as required or (C).
< process annealing, final annealing, stabilizing annealing and modified annealing time intensification rapidly-rapid cooling >
(A) making to the intensification of the temperature provinces of above-mentioned process annealing, final annealing or two annealing and the cooling rate of being down to 100 DEG C is more than 100 DEG C/sec, suppresses heating up and the precipitation containing Cr intermetallic compound that temperature-fall period produces and prevent its coarsening.
(B) make to the as required above-mentioned and intensification in Annealing Temperature region that applies and the cooling rate of being down to 100 DEG C be more than 100 DEG C/sec, identical with above-mentioned (A), suppress in the precipitation containing Cr intermetallic compound heated up and produce in temperature-fall period and prevent its coarsening.
(C) make to the intensification of above-mentioned modified anneal temperature province and the cooling rate of being down to 100 DEG C be more than 100 DEG C/sec, identical with above-mentioned (A), suppress in the precipitation containing Cr intermetallic compound heated up and produce in temperature-fall period and prevent its coarsening.
These anneal, such as, can use induction process furnace to heat up, by water-cooled cooling.
What meet above-mentioned (A) or the condition of (B) or (C) that applies as required carries out annealing by intensification-rapid cooling rapidly the aluminium alloy plate obtained simultaneously, the color by the jaundice look caused containing Cr intermetallic compound in anodic oxidation treatment subsequently can be suppressed, not yellowy pale green white can be sent.
In addition, both as mentioned above using hot rolling and cold rolling as dividing other operation to carry out, also can carry out as coherent process continuously from hot-rolled temperature region to cold rolling temperature region.When the heat-cold coherent process of the latter, in cold rolling temperature region, be all suitable for about above-mentioned cold rolling item.
The condition > of < anodic oxidation treatment
The aluminium alloy plate obtained by the present invention is supplied the anodic oxidation treatment utilizing sulfuric acid bath to carry out.Its condition does not limit, if but represent most preferred condition, then as described below.That is, when making sheet, owing to using ROLLING OIL in rolling process, so, in order to remove the oil content being attached to plate surface, usually flood in containing the acidic aqueous solution of about 3 ~ 20 quality % nitric acid.The milled sheet eliminating oil content makes anode oxide film generate equably to remove the oxide compound on surface in the anodic oxidation treatment utilizing sulfuric acid bath to carry out subsequently, be immersed in the alkaline aqueous solution containing about 5 ~ 30 quality % sodium hydroxide after washing, etch removing top layer number μm.By the milled sheet after this alkaline purification etch after washing, containing in the sulfuric acid bath of 10 ~ 30 quality % sulfuric acid, be anode with milled sheet, with 0.5 ~ 5A/dm
2, preferably with 1 ~ 3A/dm
2anodic current density, with the electrolytic bath temperature of 5 ~ 30 DEG C, preferably 10 ~ 30 DEG C, apply electrolysis treatment with the electrolysis time of 10 ~ 120 minutes, generate thickness 3 ~ 12 μm.In this film thickness range, if represented according to the method for expressing according to UCS, just can obtain film tone is L
※value 75 ~ 95, a
※value-0.8 ~ 0, b
※the bright repressed film sending the natural hair color of pale green white of yellow of value 0 ~ 2.0.
The thickness of < anode oxide film: 3 ~ 12 μm of >
If the thickness of anode oxide film is less than 3 μm, then erosion resistance, scuff resistance are just insufficient, otherwise, if be greater than 12 μm, then yellowly just to strengthen, desirable pale green white can not be obtained.Therefore, the thickness of anode oxide film is limited in the scope of 3 ~ 12 μm.
Tone > after < anodic oxidation treatment
The method for expressing of the tone after anodic oxidation treatment is the method according to UCS, and this UCS is specified by JISZ8729 and JISZ8730.That is, JISZ8729 is with L
※a
※b
※the method for expressing of the object color that colour system and Luv colour system obtain is explained, JISZ8730 explains with aberration method for expressing.
L shown in JISZ8730
※value represents brightness, and the higher tone of numerical value is brighter.A
※value, b
※value represents form and aspect, if redly, then and a
※value just increases, more little than 0, is more with green.On the other hand, if band is yellow, then b
※value just increases, more little than 0, is more with blueness.The tone that aluminium alloy plate of the present invention is obtained by sulfuric acid bath, L
※value is 75 ~ 95, a
※value is-0.8 ~ 0, b
※value is 0 ~ 2.0, is to do one's utmost to inhibit yellow pale green white.
[embodiment 1]
Plate obtained in above-mentioned < 2 > operation is used to be described further.
After founding the alloy molten solution of composition shown in table 1, make it by strainer, obtain the rolling ingot bar of thickness 560mm with DC casting.Prune the surface of this ingot bar 10mm, keeps 2 hours, then heat at the temperature of 440 DEG C, keeps 4 hours, carry out the process that homogenizes at the temperature of 540 DEG C.
Then, at the temperature of 530 DEG C, start the hot rolling of each ingot bar, be rolled down to thickness 8mm.Hot-rolled sheet temperature at the end of hot rolling is 360 DEG C.
The milled sheet of this 8mm is cold rolled to 3mm.Make heat-up rate and the cooling rate variation of being down to 100 DEG C, this 3mm plate was kept for 10 seconds at the temperature of 425 DEG C, carries out process annealing, make O material.
Then, thickness 1mm (rolling rate 67%) is cold rolled to.Make this 1mm plate heat up and be down to 100 DEG C cooling rate variation, kept for 10 seconds the temperature of 425 DEG C, carry out final annealing.
Then, correct Flatness by tension force smoother, be cut to 100mm × 100mm, make the sample of ensuing anode oxide film process.
Anode oxide film treatment process is as described below.
Degreasing is carried out on the surface cleaning each sample with organic solvent, in liquid temperature 50 DEG C, 8% aqueous sodium hydroxide solution dipping within 2 minutes, carry out sodium-hydroxide treatment, after washing, in liquid temperature 20 DEG C, 10 quality % nitric acid bath dipping within 1 minute, carry out in and.Next, with liquid temperature 18 DEG C, 15 quality % sulfuric acid baths, current density 1A/dm
2, the treatment time is changed, makes to carry out like this oxide film that each sample that pre-treatment obtains generates various thickness.After washing, carry out sealing pores and drying with the warm water of 95 DEG C.Then, tone is measured with MINOLTACM508i device.Represent result in table 2.
[table 1] alloy composition (unit: quality %)
| Alloy sequence number | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | B | Remarks |
| 1－1 | 0.08 | 0.2 | 0.03 | 0.05 | 2.0 | 0.15 | 0.10 | 0.01 | － | The present invention's example |
| 1－2 | 0.08 | 0.2 | 0.03 | 0.01 | 2.5 | 0.20 | 0.10 | 0.02 | 0.005 | The present invention's example |
| 1－3 | 0.08 | 0.2 | 0.03 | 0.03 | 3.0 | 0.25 | 0.10 | 0.02 | 0.005 | The present invention's example |
| 1－4 | 0.08 | 0.2 | 0.03 | 0.02 | 2.5 | 0.35 | 0.10 | 0.02 | 0.005 | Comparative example |
Note 1: rest part is Al and inevitable impurity
Note 2:-mark represents it is impurity levels (﹤ 0.0005)
Note 3: underscore represents it is outside specialized range
Judged by the result of table 2, in Al-Mg alloy, if Cr is in specialized range, even if contain, the tone that the intensification of process annealing and final annealing process and cooling rate are the anode oxide film of the example of the present invention (the present invention's example in Sample Number 2-1,2-2,2-3) of more than fixing speed is also yellow repressed pale green white.On the other hand, judge that Cr amount is greater than specialized range and the comparative example (Sample Number 2-4) that departs from, though heat up and cooling rate all more than fixing speed, P
cRbe worth also high, become yellow very strong grey.
Judge in addition, the comparative example (thickness of Sample Number 2-1,2-2,2-3 is 15 μm) thickness being made 15 μm that are greater than specialized range sends very strong green and yellow color.
Also judge, even the chemical constitution of chemical constitution example of the present invention, heat up and any one of cooling rate is slower than specialized range time (Sample Number 2-5,2-6), P
cRbe worth also high, become yellow very strong grey.
[embodiment 2]
Plate obtained in above-mentioned < 4 > operation is used to be described further.
After founding the alloy molten solution shown in table 1, by strainer, carry out DC casting, obtain the rolling ingot bar of thickness 560mm.Prune the surface of this ingot bar 10mm, keeps 2 hours, then heat at the temperature of 440 DEG C, keeps 4 hours, carry out the process that homogenizes at 540 DEG C of temperature.
Then, at the temperature of 530 DEG C, start the hot rolling of each ingot bar, be rolled down to thickness 6mm.Hot-rolled sheet temperature at the end of hot rolling is 360 DEG C.
The milled sheet of this 6mm is cold rolled to 1.5mm.Change heat-up rate and the cooling rate of being down to 100 DEG C respectively, this 1.5mm plate was kept for 10 seconds at the temperature of 425 DEG C, carries out process annealing, make O material.
Then, thickness 1mm (rolling rate 33%) is cold rolled to.Make this 1mm plate heat up and be down to 100 DEG C cooling rate variation, at the temperature of 220 DEG C, kept for 10 seconds, carry out stabilizing annealing.
Then, correct Flatness by tension force smoother, be cut to 100mm × 100mm, and embodiment 1 similarly carries out anode oxide film process.After this, and embodiment 1 similarly measure tone.Represent result in table 3.
Judged by the result of table 3, in Al-Mg alloy, if Cr is in specialized range, even if then contain, the tone that the intensification of process annealing and stabilizing annealing process and cooling rate are the anode oxide film of the example of the present invention (the present invention's example in Sample Number 3-1,3-2,3-3) of more than fixing speed is also yellow repressed pale green white.
On the other hand, judge that Cr amount is greater than specialized range and the comparative example (Sample Number 3-4) that departs from, though heat up and cooling rate all more than fixing speed, P
cRbe worth also high, become yellow very strong grey.
Judge in addition, the comparative example (thickness of Sample Number 3-1,3-2,3-3 is 15 μm) thickness being made 15 μm that are greater than specialized range sends very strong green and yellow color.
Also judge, even the chemical constitution of chemical constitution example of the present invention, heat up and any one of cooling rate is slower than specialized range time (Sample Number 3-5,3-6), P
cRbe worth also high, become yellow very strong grey.
In addition, about by above-mentioned < 1 > beyond < 2 > and < 4 > of actual verification in embodiment 1 and 2, < 3 >, the aluminium alloy plate of composition in the specialized range that the operation illustrated in < 5 > and < 6 > obtains, intensification and cooling rate is made to be more than 100 DEG C/sec by during all anneal after cold rolling, tone after anodic oxidation in specialized range can obtain the L in regulation
※value, a
※value, b
※value, range estimation confirms can obtain without yellow pale green white.
[embodiment 3]
The Sample Number 3-2 obtained with the condition making sheet of embodiment 2 cold rolling after 1mm plate in, measure cold rolling after do not apply stabilizing annealing cold rolling after the mechanical properties of the plate of the 1st day and the plate of the 10th day after the mechanical properties of the plate of the 1st day and the plate of the 10th day and the cold rolling after-applied stabilizing annealing of stabilizing annealing.Represent result in table 4.
[table 4]
Judged by the result of table 4, be applied with the plate (Sample Number 4-2) of stabilizing annealing though mechanical properties be also stable through 10 days, on the other hand, do not apply the plate (Sample Number 4-1) of stabilizing annealing if mechanical properties also through 10 days, will great changes will take place.
Utilizability in industry
If according to the present invention, even if a kind of anodic oxidation treatment carrying out utilizing sulfuric acid bath just can be provided, also can do one's utmost to suppress to send yellow color, and send aluminium alloy plate and the manufacture method thereof of not reddish pale green white color system.
Claims (4)
1. the aluminium alloy plate manufactured by the ingot bar utilizing DC casting to cast, is characterized in that:
The Cr of the Mg containing 2.0 ~ 3.0 quality %, 0.15 ~ 0.25 quality %, the Ti of the Ti of 0.005 ~ 0.20 quality % or 0.005 ~ 0.20 quality % and the B of 0.0005 ~ 0.05 quality %, rest part is Al and inevitable impurity, the Si in this impurity is made to be below 0.15 quality %, Fe is below 0.4 quality %, Mn is below 0.06 quality %, if the content of described Cr is T
cRthe solid solution capacity of quality %, Cr is S
cRduring quality %, T
cR-S
cRvalue P
cRmeet P
cR≤ 0.065 quality %, P
cRthe amount of the Cr in intermetallic compound,
Even if this aluminium alloy plate carries out the anodic oxidation treatment utilizing sulfuric acid bath, also can do one's utmost to suppress to send yellow color, and send the color of not reddish pale green white color system.
2. possess an aluminium alloy plate for anode oxide film, it is characterized in that:
Aluminium alloy plate according to claim 1 is coated with the sulphuric acid oxidation coating of 3 ~ 12 μm, and film tone is L
※value 75 ~ 95, a
※value-0.8 ~ 0, b
※value 0 ~ 2.0.
3. a method for the aluminium alloy plate described in manufacturing claims 1, is characterized in that:
To by containing Mg, the Cr of 0.15 ~ 0.25 quality % of 2.0 ~ 3.0 quality %, the Ti of the Ti of 0.005 ~ 0.20 quality % or 0.005 ~ 0.20 quality % and the B of 0.0005 ~ 0.05 quality %, rest part is Al and inevitable impurity, the Si in this impurity is made to be below 0.15 quality %, Fe is below 0.4 quality %, Mn be below 0.06 quality % composition form ingot bar homogenize process after carry out hot rolling, carry out afterwards cold rolling after whole anneal in, intensification and cooling rate is made to be more than 100 DEG C/sec, if the content of described Cr is T
cRthe solid solution capacity of quality %, Cr is S
cRduring quality %, T
cR-S
cRvalue P
cRmeet P
cR≤ 0.065 quality %, P
cRit is the amount of the Cr in intermetallic compound.
4. possess a manufacture method for the aluminium alloy plate of anode oxide film, it is characterized in that:
The aluminium alloy plate obtained by method according to claim 3 covers the sulphuric acid oxidation coating of 3 ~ 12 μm, makes film tone be L
※value 75 ~ 95, a
※value-0.8 ~ 0, b
※value 0 ~ 2.0.
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| JP2010046723A JP5640399B2 (en) | 2010-03-03 | 2010-03-03 | Aluminum alloy plate with anodized film and method for producing the same |
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| JP5640399B2 (en) | 2014-12-17 |
| KR20110100158A (en) | 2011-09-09 |
| KR101310497B1 (en) | 2013-09-24 |
| CN103374675A (en) | 2013-10-30 |
| JP2011179094A (en) | 2011-09-15 |
| CN102191415A (en) | 2011-09-21 |
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