JP2011179094A - Aluminum alloy sheet and method for producing the same - Google Patents

Aluminum alloy sheet and method for producing the same Download PDF

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JP2011179094A
JP2011179094A JP2010046723A JP2010046723A JP2011179094A JP 2011179094 A JP2011179094 A JP 2011179094A JP 2010046723 A JP2010046723 A JP 2010046723A JP 2010046723 A JP2010046723 A JP 2010046723A JP 2011179094 A JP2011179094 A JP 2011179094A
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aluminum alloy
annealing
mass
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temperature
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JP5640399B2 (en
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Takanori Fujii
Yoshisada Hoshino
Kazumitsu Mizushima
良定 星野
一光 水嶋
孝典 藤井
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Nippon Light Metal Co Ltd
日本軽金属株式会社
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/10Alloys containing non-metals
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing 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
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02Anodisation
    • C25D11/04Anodisation of aluminium or alloys based thereon

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet in which the coloring of yellow color taste can be suppressed as much as possible even if anodic oxidation with a sulfuric acid bath is performed, and which colors to light green white color which does not wear red taste, and a method for producing the same. <P>SOLUTION: The aluminum alloy sheet has a composition comprising, by mass, 2.0 to 3.0% Mg, 0.15 to 0.25% Cr, 0.005 to 0.20% Ti or 0.005 to 0.20% Ti and 0.0005 to 0.05% B, and the balance Al with inevitable impurities, and in which, provided that, in the impurities, the content of Si is controlled to ≤0.15%, the content of Fe is controlled to ≤0.4%, the content of Mn is controlled to ≤0.06%, and the above Cu content is controlled to T<SB>CR</SB>%, and the solid solution amount of Cr is controlled to S<SB>CR</SB>%, P<SB>CR</SB>=T<SB>CR</SB>-S<SB>CR</SB>≤0.065 is satisfied. In the method for producing an aluminum alloy sheet, an ingot having the above composition is subjected to homogenizing treatment, is thereafter subjected to hot rolling, is heated-up by the subsequent cold rolling, is subjected to processing annealing at a temperature reducing rate of ≥100°C/s, is subjected to cold rolling, is thereafter heated-up and is subjected to stabilization annealing at a temperature reducing rate of ≥100°C/s. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、陽極酸化皮膜が淡緑白のアルミニウム合金板およびその製造方法に関する。   The present invention relates to an aluminum alloy plate having a light green and white anodized film and a method for producing the same.
Al−Mg系合金板は、その製板過程で中間焼鈍され、所要の機械的特性を付与するために冷間圧延および焼鈍処理される。しかし、冷間加工後この系の合金は自然軟化して強度が安定しないので、必要に応じて冷間圧延後に安定化焼鈍が施される場合もある。   The Al—Mg-based alloy sheet is subjected to intermediate annealing in the process of making the sheet, and is subjected to cold rolling and annealing in order to impart required mechanical characteristics. However, after cold working, the alloy of this type is naturally softened and the strength is not stabilized, so that stabilization annealing may be performed after cold rolling as necessary.
アルミニウム合金板は硫酸浴による陽極酸化処理することで、表面が合金特有の色調を有し、建築用の内外装パネル、器物、家電製品、デジタルカメラやPC等の電機電子機器等に使用されている。例えば非熱処理合金で残留歪少なく加工精度の良いJIS5052合金板は硫酸浴による陽極酸化処理で黄色味を帯びた色調を発色する。この色調は再結晶粒微細化等のために添加される合金中のCrが原因と考えられ、黄色味を嫌う場合はCr無添加のアルミニウム合金板が上梓されている。   The aluminum alloy plate is anodized with a sulfuric acid bath, and the surface has a color tone peculiar to the alloy, and it is used for electrical and electronic equipment such as architectural interior and exterior panels, equipment, home appliances, digital cameras and PCs. Yes. For example, a JIS 5052 alloy plate that is a non-heat-treatable alloy and has low residual strain and good processing accuracy develops a yellowish color tone by anodizing with a sulfuric acid bath. This color tone is considered to be caused by Cr in the alloy added for recrystallized grain refinement or the like, and when it dislikes the yellow color, an aluminum alloy plate containing no Cr is added.
特開平9−143602号公報は、不純物としてのCrを0.02%以下としたMnを0.10〜0.30%含有するAl−Mg系の合金板が開示されている。   Japanese Patent Application Laid-Open No. 9-143602 discloses an Al—Mg-based alloy plate containing 0.10 to 0.30% of Mn with Cr as an impurity of 0.02% or less.
特開平9−143602号公報Japanese Patent Laid-Open No. 9-143602
本発明はAl−Mg系の合金板であって、再結晶粒微細化等のためにCrが添加含有されている。しかしながら、Crを含有すると硫酸浴による陽極酸化処理で強い黄色味を帯びてしまい、白色系に発色するアルミニウム合金板が得られず、板の用途に制限がある。   The present invention is an Al-Mg based alloy plate, which contains Cr for recrystallization grain refinement. However, if Cr is contained, an anodizing treatment with a sulfuric acid bath gives a strong yellowish tinge, and an aluminum alloy plate that develops a white color cannot be obtained, and the use of the plate is limited.
即ち、本発明は、硫酸浴による陽極酸化処理しても黄色味発色を極力抑えることができ、かつ紅色味を帯びない淡緑白色系に発色するアルミニウム合金板およびその製造方法を提供することを目的とする。   That is, the present invention provides an aluminum alloy plate that can suppress yellowish color development as much as possible even when anodized with a sulfuric acid bath, and that develops a pale greenish white color that does not have a reddish taste, and a method for producing the same. Objective.
発明者らは、Crを含有するAl−Mg系合金板における黄色味の発色は、鋳造を含む製板過程において生成されるCr含有の金属間化合物によるものであるという知見を得て、本発明を完成させた。   The inventors have obtained the knowledge that the yellowish coloring in the Al-Mg alloy plate containing Cr is due to the Cr-containing intermetallic compound produced in the plate making process including casting, and the present invention Was completed.
すなわち、本発明は下記(1)〜(4)のとおりである。   That is, the present invention is as follows (1) to (4).
(1)Mg2.0〜3.0質量%、Cr0.15〜0.25質量%、Ti0.005〜0.20質量%、またはTi0.005〜0.20質量%およびB0.0005〜0.05質量%を含有し、残部Alおよび不可避不純物からなり、該不純物中のSiを0.15質量%以下、Feを0.4質量%以下、Mnを0.06質量%以下とし、前記Crの含有量をTCR質量%、Crの固溶量をSCR質量%としたとき、TCR−SCRの値PCRが、PCR≦0.065質量%であることを特徴とするアルミニウム合金板。 (1) Mg 2.0-3.0 mass%, Cr 0.15-0.25 mass%, Ti 0.005-0.20 mass%, or Ti 0.005-0.20 mass% and B0.0005-0. Containing 05% by mass, the balance being Al and inevitable impurities, Si in the impurity being 0.15% by mass or less, Fe being 0.4% by mass or less, Mn being 0.06% by mass or less, when the content of T CR wt%, the solid solution amount of Cr was S CR wt%, an aluminum alloy value P CR of T CR -S CR, characterized in that a P CR ≦ 0.065 wt% Board.
(2)上記(1)記載のアルミニウム合金板に硫酸陽極酸化皮膜が3〜12μm被覆されていることを特徴とする陽極酸化皮膜を備えたアルミニウム合金板。   (2) An aluminum alloy plate provided with an anodized film, wherein the aluminum alloy plate according to (1) is coated with 3 to 12 μm of a sulfuric acid anodized film.
(3)上記(1)記載の組成からなる鋳塊を均質化処理後に熱間圧延し、その後の冷間圧延後の全ての焼鈍処理において、昇温および降温速度を100℃/秒以上とすることを特徴とするアルミニウム合金板の製造方法。   (3) The ingot having the composition described in the above (1) is hot-rolled after homogenization treatment, and in all annealing treatments after the subsequent cold-rolling, the temperature rise and fall rate is 100 ° C./second or more. A method for producing an aluminum alloy plate characterized by the above.
(4)上記(3)記載の方法により得られたアルミニウム合金板に硫酸陽極酸化皮膜を3〜12μm被覆することを特徴とする陽極酸化皮膜を備えたアルミニウム合金板の製造方法。   (4) A method for producing an aluminum alloy plate provided with an anodized film, wherein the aluminum alloy plate obtained by the method described in (3) above is coated with 3 to 12 μm of a sulfuric acid anodized film.
すなわち、本発明は、(1)硫酸陽極酸化処理に適したアルミニウム合金板、(2)硫酸陽極酸化皮膜を備えたアルミニウム合金板、(3)硫酸陽極酸化処理に適したアルミニウム合金板の製造方法、(4)硫酸陽極酸化皮膜を備えたアルミニウム合金板の製造方法を提供する。   That is, the present invention includes (1) an aluminum alloy plate suitable for sulfuric acid anodizing treatment, (2) an aluminum alloy plate provided with sulfuric acid anodizing film, and (3) a method for producing an aluminum alloy plate suitable for sulfuric acid anodizing treatment. (4) A method for producing an aluminum alloy plate provided with a sulfuric acid anodized film is provided.
本発明のCrを含有するAl−Mg系合金板は、Cr含有の金属間化合物量を所定値以下とすることにより、硫酸浴による陽極酸化皮膜を被覆しても黄色味を極力抑えた淡緑白色に発色するアルミニウム合金板であるので、色調の選択範囲が拡がり、白色系が好まれる建築用の内外装パネルや器物、家電製品、デジタルカメラやPC等の電機電子機器等の筺体等に使用できる効果を有する。また、該合金板の製造方法は製板時の昇温降温速度を急速にする程度の技術応用で、前記効果を有する板を容易に提供できる効果を有する。   The Al—Mg-based alloy plate containing Cr of the present invention is a light green in which the amount of Cr-containing intermetallic compound is set to a predetermined value or less to suppress yellowness as much as possible even when an anodized film is coated with a sulfuric acid bath. Because it is a white color aluminum alloy plate, the color selection range is widened, and it is used for enclosures such as interior / exterior panels and equipment for construction, home appliances, digital cameras and PCs, etc. It has an effect that can be done. Moreover, the manufacturing method of this alloy plate has the effect that the plate which has the said effect can be provided easily by the technical application of the grade which makes the temperature increase / decrease rate at the time of plate making rapid.
本発明において、化学組成を限定する理由を説明する。   The reason for limiting the chemical composition in the present invention will be described.
<Mg:2.0〜3.0質量%>
MgはJISA5xxx系合金の主元素で、加工硬化のみで十分に強度付与するための元素であり、下限値未満ではパネル、器物に加工した場合強度不足となり、また上限値を超えると成形性に欠ける。
<Mg: 2.0 to 3.0% by mass>
Mg is a main element of JISA5xxx series alloy, and is an element for imparting sufficient strength only by work hardening. If it is less than the lower limit, it becomes insufficient in strength when processed into a panel or a container, and if it exceeds the upper limit, it lacks formability. .
Mgのみを含有するAl−Mg合金では硫酸電解浴系陽極酸化処理で表面の色調が淡灰色に発色する。   In an Al—Mg alloy containing only Mg, the surface color tone is colored light gray by sulfuric acid electrolytic bath system anodizing treatment.
<Cr:0.15〜0.25質量%>
CrはJISA5xxx系合金の中間焼鈍に際して再結晶粒を微細化するための元素で、下限値未満ではその効果が不足となり、また上限値を超えると本発明の製造方法であっても陽極酸化処理で黄色味を強く帯び不適当である。
<Cr: 0.15 to 0.25% by mass>
Cr is an element for refining recrystallized grains during intermediate annealing of JISA5xxx series alloys, and its effect is insufficient if it is less than the lower limit, and if it exceeds the upper limit, it is anodized even in the production method of the present invention. Strongly yellowish and unsuitable.
<Ti:0.005〜0.20質量%>または
<Ti:0.005〜0.20質量%およびB:0.0005〜0.05質量%>
TiまたはTiおよびBは、鋳造組織を微細化し、鋳造時に鋳塊の割れを有効に防止するための元素で、Ti単独添加でもいいが、TiとBを複合添加すると鋳造組織の微細化性能が向上し、鋳造時の鋳塊割れ防止性能が向上する。それぞれ含有量が下限値未満では微細化効果少なく鋳塊の割れ防止性能が低下する。上限値を超えるとAl−TiあるいはTi−Bの粗大な金属間化合物が晶出し、板の加工性・成形性を損ねる。Ti、またはTiおよびBの含有量は、返り材の選択、およびTi金属、Al−Ti母合金またはAl−Ti−Bの一種または二種以上を適宜選択添加して調整することができる。
<Ti: 0.005-0.20 mass%> or <Ti: 0.005-0.20 mass% and B: 0.0005-0.05 mass%>
Ti or Ti and B are elements for refining the cast structure and effectively preventing cracking of the ingot during casting. Ti alone may be added, but when Ti and B are added in combination, the refinement performance of the cast structure is improved. This improves the ingot cracking prevention performance during casting. When the content is less than the lower limit, the effect of preventing cracking of the ingot is reduced with a small refining effect. If the upper limit is exceeded, a coarse intermetallic compound of Al-Ti or Ti-B will crystallize, impairing the workability and formability of the plate. The content of Ti or Ti and B can be adjusted by selecting a return material and appropriately selecting and adding one or more of Ti metal, Al—Ti master alloy or Al—Ti—B.
<不可避不純物>
不可避不純物は、意図的に添加する合金元素Mg,Cr,Ti(またはMg,Cr,TiおよびB)以外の元素を指し、通常の溶製方法では地金、返り材、母合金および治工具等から混入してしまう避けがたいものをいう。しかしながら、本発明においては、不可避不純物の混入量が多くなると、その元素特有の色を発色して本発明の特徴ある黄色味を抑えた淡緑白色の発色を損ねるので限定する必要がある。即ち影響の大きいSiは0.15質量%以下、Feは0.4質量%以下、Mnは0.06質量%以下である。その他の不可避不純物はZnは0.25質量%以下、Cuは各0.1質量%以下、好ましくは各0.05質量%以下である。その他の元素は各々0.05質量%以下に規制することが好ましい。
<Inevitable impurities>
Inevitable impurities refer to elements other than the intentionally added alloy elements Mg, Cr, Ti (or Mg, Cr, Ti, and B). In ordinary melting methods, bullion, return material, mother alloy, jigs, etc. It is an unavoidable thing that gets mixed in. However, in the present invention, if the amount of inevitable impurities mixed is increased, the color peculiar to the element is developed to impair the pale green-white color development that suppresses the characteristic yellowness of the present invention, so it is necessary to limit it. That is, Si having a large influence is 0.15% by mass or less, Fe is 0.4% by mass or less, and Mn is 0.06% by mass or less. The other inevitable impurities are 0.25% by mass or less for Zn, 0.1% by mass or less for Cu, and preferably 0.05% by mass or less for each. The other elements are preferably regulated to 0.05% by mass or less.
<TCR−SCR=PCR≦0.065質量%>
ここで、TCRはCrの含有量(質量%)、SCRはCrの固溶量(質量%)、PCRは金属間化合物中のCrの量(質量%)であり、PCR=TCR−SCRで表わされる。
<T CR -S CR = P CR ≦ 0.065 wt%>
Here, T CR content of Cr (wt%), S CR is solid solution amount of Cr (mass%), P CR is the amount of Cr in the intermetallic compound (mass%), P CR = T represented by CR -S CR.
黄色味はCr含有金属間化合物、例えばAl7Cr,Al11Cr,Al18Cr2Mg3等で表される化合物であって、入射光がこれらの化合物に反射し、黄色波長が優先され黄色味を強く呈するものと考えられる。 Yellowish is a Cr-containing intermetallic compound, for example, a compound represented by Al 7 Cr, Al 11 Cr, Al 18 Cr 2 Mg 3, etc., and incident light is reflected by these compounds, and the yellow wavelength is given priority. It is considered to have a strong taste.
《固溶Crの分析》
熱フェノールでAl分を溶解し、溶液中のCrをIPC発光分析法で分析して固溶Cr(SCR)を定量する。この方法でSCRの値が得られるので、Cr含有量(TCR)からTCR−SCR=PCRの値、即ち金属間化合物中のCr量(PCR質量%)の値が計算できる。
<< Analysis of solid solution Cr >>
The Al content is dissolved with hot phenol, and Cr in the solution is analyzed by IPC emission spectrometry to determine the solid solution Cr (S CR ). Since the value of S CR is obtained by this method, Cr content (T CR) from the T CR -S CR = P CR value, i.e. Cr content in the intermetallic compound (P CR wt%) values can be calculated for .
《黄色味発色抑制のメカニズム》
このPCRの値は化合物として存在するCrの量であって、PCRの値が大きいということは、Cr含有化合物の量が多いということであり、したがって、入射光の内優先される黄色波長を呈する光線量が多く黄色味を強く呈するものと考えられる。このPCR値が0.065質量%以下であれば、Cr含有化合物の量も少なく、よって、黄色波長を呈する光線量が少なく黄色味を抑制できるものと考察できる。
《Yellow color suppression mechanism》
The value of this P CR is a quantity of Cr present as compounds, that the value of P CR is large, it means that the amount of Cr-containing compound is large, therefore, the inner prioritized the yellow wavelength of the incident light It is considered that the amount of light presenting is large and the yellowish color is strongly exhibited. If the P CR value is less 0.065 mass%, the amount of Cr-containing compounds are also reduced, thus, can be considered as capable of suppressing light amount is small yellowish to yellow color wavelength.
次に、本発明のアルミニウム合金板の好ましい製造方法を説明する。
発明の好ましい製造方法は次の工程を含む。
<1>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に最終焼鈍処理する。
<2>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に中間焼鈍処理し、次いで 冷間圧延し、最終焼鈍する。中間焼鈍処理は複数回可能。
<3>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に中間焼鈍処理し、次いで 冷間圧延する。中間焼鈍処理は複数回可能。
<4>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に中間焼鈍処理し、次いで 冷間圧延し、安定化焼鈍処理する。中間焼鈍処理は複数回可能。
<5>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に調質焼鈍処理する。
<6>鋳塊を均質化処理後熱間圧延し、その後の冷間圧延後に中間焼鈍処理し、次いで 冷間圧延し、冷間圧延後調質焼鈍処理する。中間焼鈍処理は複数回可能。
Next, the preferable manufacturing method of the aluminum alloy plate of this invention is demonstrated.
A preferred production method of the invention includes the following steps.
<1> The ingot is hot-rolled after homogenization treatment, and then subjected to final annealing treatment after subsequent cold rolling.
<2> The ingot is subjected to hot rolling after homogenization, followed by intermediate annealing after subsequent cold rolling, followed by cold rolling and final annealing. Intermediate annealing can be performed multiple times.
<3> The ingot is subjected to hot rolling after homogenization treatment, followed by intermediate annealing treatment after subsequent cold rolling, and then cold rolling. Intermediate annealing can be performed multiple times.
<4> The ingot is subjected to hot rolling after homogenization treatment, intermediate annealing treatment after subsequent cold rolling, then cold rolling, and stabilization annealing treatment. Intermediate annealing can be performed multiple times.
<5> The ingot is subjected to hot rolling after homogenization treatment, and temper annealing treatment is performed after subsequent cold rolling.
<6> The ingot is subjected to hot rolling after homogenization treatment, intermediate annealing treatment after subsequent cold rolling, then cold rolling, and temper annealing treatment after cold rolling. Intermediate annealing can be performed multiple times.
本発明に係るアルミニウム合金板は、本発明組成のもとで陽極酸化皮膜の色調がL値が75〜95、a値が−0.8〜0、b値が0〜2.0であることは新規なものであって、その製造条件は限定するものではないが、技術的関係の理解を深めるために、その最も好ましい製造法の例を示すと以下のとおりである。 In the aluminum alloy plate according to the present invention, the color tone of the anodized film is L * value is 75 to 95, a * value is −0.8 to 0, b * value is 0 to 2.0 under the composition of the present invention. However, in order to deepen the understanding of the technical relationship, an example of the most preferable production method is as follows.
<1>の工程を更に説明する。
本発明組成の合金溶湯を溶製後半連続鋳造法(DC鋳造)等によって、好ましくはフィルターを通して鋳造し、圧延用鋳塊を得る。該鋳塊は表面を好ましくは5以上20mm程度まで面削して鋳塊表層部の不均一層を除去し、440〜560℃に1〜24時間程度またはそれ以上加熱保持して均質化熱処理をする。多段の均質化処理の場合は、少なくとも高温の段階が該温度条件を満たせばよい。この処理でβ相(Mg2Al3)の偏析、その他Crなどの局部的ミクロ偏析を軽減乃至解消する。
The process <1> will be further described.
The molten alloy having the composition of the present invention is cast by a second half continuous casting method (DC casting), preferably through a filter, to obtain an ingot for rolling. The surface of the ingot is preferably chamfered to about 5 to 20 mm to remove a non-uniform layer on the surface of the ingot, and heated to 440 to 560 ° C. for about 1 to 24 hours or more to perform a homogenization heat treatment. To do. In the case of a multistage homogenization process, at least the high temperature stage should satisfy the temperature condition. This treatment reduces or eliminates the segregation of β phase (Mg 2 Al 3 ) and other local micro segregation such as Cr.
次に熱間圧延で2〜10mm程度の厚さまで圧延を行う。この熱間圧延の過程で合金元素を微細な金属間化合物として析出させ、最終焼鈍処理で再結晶粒が微細化し、爾後の陽極酸化処理で色相を均整なものとする。   Next, it is rolled to a thickness of about 2 to 10 mm by hot rolling. In the course of this hot rolling, the alloy elements are precipitated as fine intermetallic compounds, the recrystallized grains are refined by the final annealing treatment, and the hue is made uniform by the subsequent anodic oxidation treatment.
<2>の工程を更に説明する。
<1>の工程と同様に熱間圧延を終了した圧延板は、常法による冷間圧延をし、中間焼鈍を施して軟化させO材とした後、圧延率を定めて冷間圧延して所要の厚さの板とし、次いで最終焼鈍を施す。中間焼鈍処理は複数回施してもよい。
The step <2> will be further described.
The rolled sheet that has been hot-rolled in the same manner as in the step <1> is cold-rolled by a conventional method, subjected to intermediate annealing, softened to obtain an O material, and then cold-rolled by setting a rolling rate. A plate having a required thickness is formed, and then final annealing is performed. The intermediate annealing treatment may be performed a plurality of times.
<3>の工程を更に説明する。
<1>の工程と同様に熱間圧延を終了した圧延板は、常法による冷間圧延をし、中間焼鈍を施して軟化させO材とした後、次いで圧延率を定めて冷間圧延して所要の機械的特性を付与する。中間焼鈍処理は複数回施してもよい。
The step <3> will be further described.
The rolled sheet that has been hot-rolled in the same manner as in step <1> is cold-rolled by a conventional method, subjected to intermediate annealing, softened to obtain an O material, and then cold-rolled with a rolling rate determined. To give the required mechanical properties. The intermediate annealing treatment may be performed a plurality of times.
<4>の工程を更に説明する。
Al−Mg系合金は、冷間加工後自然軟化して強度が安定しないので、安定した材料を求められる場合は最終冷間圧延後に安定化処理を行う。即ち、<1>の工程と同様に熱間圧延を終了した圧延板は、常法による冷間圧延をし、中間焼鈍を施して軟化させO材とした後、最終冷間圧延し、安定化焼鈍を行う。中間焼鈍処理は複数回施してもよい。
<5>の工程を更に説明する。
Al−Mg系合金は、組成および冷間圧延率が既知であれば、冷間圧延後の加熱条件を定めることで機械的性質を予測できるので、<1>の工程と同様に熱間圧延を終了した板は、常法による冷間圧延で冷間圧延率を定めて圧延し、該圧延後調質焼鈍処理する。
<6>の工程を更に説明する。
Al−Mg系合金は、組成および冷間圧延率が既知であれば、冷間圧延後の加熱条件を定めることで機械的性質を予測できるので、<1>の工程と同様に熱間圧延を終了した板は、常法による冷間圧延をし、中間焼鈍を施して軟化させO材とした後、冷間圧延率を定めて圧延し、該圧延後調質焼鈍処理する。中間焼鈍処理は複数回実施してもよい。
The process <4> will be further described.
Since the Al—Mg alloy is naturally softened after cold working and the strength is not stabilized, when a stable material is required, a stabilization treatment is performed after the final cold rolling. That is, the rolled sheet that has been hot-rolled in the same manner as in step <1> is subjected to cold rolling according to a conventional method, subjected to intermediate annealing, softened to obtain an O material, and then finally cold-rolled and stabilized. Annealing is performed. The intermediate annealing treatment may be performed a plurality of times.
The process <5> will be further described.
If the composition and the cold rolling rate of Al-Mg alloy are known, the mechanical properties can be predicted by determining the heating conditions after cold rolling, so hot rolling is performed in the same manner as in step <1>. The finished plate is rolled by cold rolling according to a conventional method by setting a cold rolling rate, and is subjected to temper annealing after the rolling.
The process <6> will be further described.
If the composition and the cold rolling rate of Al-Mg alloy are known, the mechanical properties can be predicted by determining the heating conditions after cold rolling, so hot rolling is performed in the same manner as in step <1>. The finished plate is cold-rolled by a conventional method, subjected to intermediate annealing, softened to obtain an O material, and then rolled at a cold rolling rate, and subjected to temper annealing after the rolling. The intermediate annealing treatment may be performed a plurality of times.
この中間焼鈍、最終焼鈍、安定化焼鈍および調質焼鈍の昇温および降温速度条件が本発明の色調を得るために重要である。即ちCrを含む金属間化合物の析出を極力抑制することにある。この中間焼鈍または最終焼鈍の条件は370〜500℃の温度に1〜100秒保持してO材とする。中間焼鈍後安定化焼鈍処理する場合は、付与強度の程度によって異なり、冷間圧延後、150〜250℃の温度に1〜100秒保持して安定化焼鈍を行う。
冷間圧延率を定めて冷間圧延し、該圧延後に調質焼鈍処理する場合は、最終的に求められる機械的性質によって条件が異なり、冷間圧延後、250〜370℃の温度に1〜100秒保持して調質焼鈍処理を行う。
This intermediate annealing, final annealing, stabilization annealing, and temper annealing temperature increase and temperature decrease rate conditions are important for obtaining the color tone of the present invention. That is, it is to suppress the precipitation of intermetallic compounds containing Cr as much as possible. The intermediate annealing or final annealing conditions are maintained at a temperature of 370 to 500 ° C. for 1 to 100 seconds to obtain an O material. When performing the stabilization annealing treatment after the intermediate annealing, it varies depending on the degree of the applied strength, and after the cold rolling, the stabilization annealing is performed by maintaining the temperature at 150 to 250 ° C. for 1 to 100 seconds.
When the cold rolling is determined and cold rolling is performed, and the temper annealing treatment is performed after the rolling, the conditions vary depending on the finally required mechanical properties, and after cold rolling, the temperature is set to 1 to 250 to 370 ° C. The temper annealing process is performed for 100 seconds.
ここで、本発明の製造方法は、下記必ず施される(A)または必要に応じて施される(B)または(C)を特徴とする。   Here, the production method of the present invention is characterized by the following (A) that is necessarily applied or (B) or (C) that is applied as necessary.
<中間焼鈍、最終焼鈍、安定化焼鈍および調質焼鈍時の急速昇温・急速降温>
(A)上記の中間焼鈍、最終焼鈍もしくは両焼鈍の温度域への昇温および100℃までの降温速度を100℃/秒以上として、昇温および降温過程で生じるCrを含む金属間化合物の析出の抑制とその粗大化を防ぐ。
<Rapid temperature increase / decrease during intermediate annealing, final annealing, stabilization annealing and temper annealing>
(A) Precipitation of an intermetallic compound containing Cr generated in the temperature raising and temperature lowering process at a temperature rising rate of 100 ° C./second or more at a temperature rising rate of 100 ° C./second or more in the intermediate annealing, final annealing or both annealing temperature ranges. Control and coarsening.
(B)上記の必要に応じて施される安定化焼鈍温度域への昇温および100℃までの降温速度を100℃/秒以上として、前記の(A)と同じく昇温および降温過程で生じるCrを含む金属間化合物の析出の抑制とその粗大化を防ぐ。
(C)上記の調質焼鈍処理温度域への昇温および100℃までの降温速度を100℃/秒以上として、前記の(A)と同じく、昇温および降温過程で生じるCrを含む金属間化合物の析出の抑制とその粗大化を防ぐ。
これらの焼鈍処理は、例えば、電磁誘導式加熱炉を用いて昇温し、水冷により降温すれば可能である。
(B) The temperature rise to the stabilized annealing temperature range and the temperature drop rate up to 100 ° C. performed as necessary are set to 100 ° C./second or more, and are generated in the temperature rise and temperature drop process similar to (A) above. Suppression of precipitation and coarsening of intermetallic compounds containing Cr are prevented.
(C) As in (A) above, between the metals containing Cr generated in the temperature raising and temperature lowering process, with the temperature rising to the temper annealing treatment temperature range and the temperature lowering rate to 100 ° C. being 100 ° C./second or more. Prevents the precipitation and coarsening of the compound.
These annealing treatments are possible, for example, by raising the temperature using an electromagnetic induction heating furnace and lowering the temperature by water cooling.
上記(A)または必要に応じて施される(B)または(C)の条件を共に満たす急速昇温・急速降温により焼鈍を行なって得られたアルミニウム合金板は、爾後の陽極酸化処理でCrを含む金属間化合物による黄色味発色を抑制でき、黄色味を帯びない淡緑白色に発色させることができる。   An aluminum alloy sheet obtained by annealing by rapid heating / rapid cooling that satisfies both the above conditions (A) or (B) or (C), which is applied as necessary, is obtained by subjecting Cr to an It is possible to suppress the yellowish color development due to the intermetallic compound containing, and to develop a light green white color without yellowishness.
なお、熱間圧延と冷間圧延とを上記のように別個の工程として行なってもよいし、熱間圧延温度域から冷間圧延温度域まで連続して一貫工程として行なってもよい。後者の熱間・冷間一貫工程の場合、冷間圧延温度域においては、上記冷間圧延に関する事項は全て適用される。   In addition, you may perform a hot rolling and a cold rolling as a separate process as mentioned above, and you may carry out as a consistent process continuously from a hot rolling temperature range to a cold rolling temperature range. In the case of the latter hot / cold integrated process, all the matters related to the cold rolling are applied in the cold rolling temperature range.
<陽極酸化処理の条件>
本発明によるアルミニウム合金板は硫酸浴による陽極酸化処理に供される。その条件は限定するものではないが、最も好ましい条件を示せば以下のとおりである。即ち製板に際して圧延工程で圧延油を使用するので板表面の付着油分を除去するために通常、硝酸を3〜20質量%程度含有した酸性水溶液中に浸漬する。油分の除去された圧延板は、表面の酸化物を除去し、爾後の硫酸浴による陽極酸化処理で陽極酸化皮膜を均一に形成させるために、水洗後苛性ソーダを5〜30質量%程度含有するアルカリ性水溶液中に浸漬し、エッチングして表層数μmを除去する。このアルカリ処理でエッチングされた圧延板は、水洗後硫酸を10〜30質量%含有する硫酸浴中で、圧延板を陽極として、陽極電流密度0.5〜5A/dm2、好ましくは1〜3A/dm2とし、電解浴温5〜30℃、好ましくは10〜30℃、電解時間10〜120分で電解処理を施し、皮膜厚さとして3〜12μm生成させる。この皮膜厚さ範囲で、UCSによる表示方法に従って示すと、皮膜色調がL値75〜95、a値−0.8〜0、b値0〜2.0である明るい黄味の抑制された淡緑白に発色した自然発色皮膜が得られる。
<Conditions for anodizing treatment>
The aluminum alloy plate according to the present invention is subjected to anodizing treatment with a sulfuric acid bath. The conditions are not limited, but the most preferable conditions are as follows. That is, since rolling oil is used in the rolling process during plate making, it is usually immersed in an acidic aqueous solution containing about 3 to 20% by mass of nitric acid in order to remove the oil adhering to the plate surface. The rolled sheet from which the oil content has been removed is an alkaline solution containing about 5 to 30% by weight of caustic soda after washing in order to remove oxides on the surface and form an anodized film uniformly by anodizing with a sulfuric acid bath after dripping. It is immersed in an aqueous solution and etched to remove several μm of surface layer. The rolled sheet etched by this alkali treatment is washed with water and then in a sulfuric acid bath containing 10 to 30% by mass of sulfuric acid, with the rolled sheet as the anode, the anode current density is 0.5 to 5 A / dm 2 , preferably 1 to 3 A. / Dm 2 , an electrolytic bath temperature of 5 to 30 ° C., preferably 10 to 30 ° C., and an electrolysis time of 10 to 120 minutes is applied to form a film thickness of 3 to 12 μm. In this film thickness range, according to the display method by UCS, the film color tone is L * value 75 to 95, a * value -0.8 to 0, b * suppression of bright yellowish value 0 to 2.0 A natural coloring film colored light green and white is obtained.
<陽極酸化皮膜の厚さ:3〜12μm>
陽極酸化皮膜の厚さは、3μm未満であると耐食性、耐引っ掻き疵性が不十分であり、逆に12μmを超えると黄色味が強くなり、好ましい淡緑白が得られない。したがって、陽極酸化皮膜の厚さは3〜12μmの範囲内に限定する。
<Thickness of anodized film: 3 to 12 μm>
When the thickness of the anodized film is less than 3 μm, the corrosion resistance and scratch resistance are insufficient, and conversely, when it exceeds 12 μm, the yellowish color becomes strong and a preferable pale green and white cannot be obtained. Therefore, the thickness of the anodized film is limited to the range of 3 to 12 μm.
<陽極酸化処理後の色調>
陽極酸化処理後の色調の表示方法はUCSによるもので、このUCSは、JISZ8729とJISZ8730で規定される。即ち、JISZ8729はL表色系及びLuv表色系による物体色の表示方法、JISZ8730は色差表示方法で解説されている。
<Color tone after anodizing>
The display method of the color tone after the anodizing treatment is based on UCS, and this UCS is defined by JISZ8729 and JISZ8730. That is, JISZ8729 is described in the object color display method using the L * a * b * color system and the Luv color system, and JISZ8730 is described in the color difference display method.
JISZ8730に示されるL値は明度を示し、数値が高いほど明るい色調となる。a値、b値は色相を示し、赤味を帯びるとa値が高くなり、0より小さくなるほど緑色味を帯びる。これに対して黄味を帯びるとb値が高くなり、0より小さくなるほど青色味を帯びる。本発明のアルミニウム合金板の硫酸浴によって得られる色調は、L値が75〜95、a値が−0.8〜0、b値が0〜2.0であって、黄色味を極力抑えた淡緑白である。 The L * value shown in JISZ8730 indicates lightness, and the higher the value, the brighter the tone. The a * value and b * value indicate the hue, and when reddish, the a * value increases. On the other hand, if it becomes yellowish, b * value will become high, and it will become blueish, so that it becomes smaller than 0. The color tone obtained by the sulfuric acid bath of the aluminum alloy plate of the present invention has an L * value of 75 to 95, an a * value of −0.8 to 0, and a b * value of 0 to 2.0. It is light green and white as much as possible.
前記<2>の工程で製造される板を用いて更に説明する。
表1に示す組成の合金溶湯を溶製後、フィルターを通過させてDC鋳造法で厚さ560mmの圧延用鋳塊を得た。この鋳塊の表面を10mm面削し、440℃の温度に2時間保持し、さらに加熱して540℃の温度に4時間保持して均質化処理した。
次いで各鋳塊の熱間圧延は530℃の温度で開始し、厚さ8mmまで圧延した。熱間圧延終了時の熱延板の温度は360℃であった。
該8mmの圧延板を冷間で3mmまで圧延した。この3mm板を昇温および100℃までの降温速度を変動させて425℃の温度に10秒保持して中間焼鈍しO材とした。
次に厚さ1mm(圧延率67%)まで冷間圧延した。この1mm板を昇温および100℃までの降温速度を変動させて425℃の温度に10秒保持して最終焼鈍した。
次にテンションレベラをとおして平坦度を出し、100mm×100mmに切断して次の陽極酸化皮膜処理の試料とした。
It demonstrates further using the board manufactured at the process of said <2>.
The molten alloy having the composition shown in Table 1 was melted and then passed through a filter to obtain a rolling ingot having a thickness of 560 mm by a DC casting method. The surface of the ingot was chamfered by 10 mm, held at a temperature of 440 ° C. for 2 hours, further heated and held at a temperature of 540 ° C. for 4 hours for homogenization.
Next, hot rolling of each ingot was started at a temperature of 530 ° C. and rolled to a thickness of 8 mm. The temperature of the hot rolled sheet at the end of hot rolling was 360 ° C.
The 8 mm rolled plate was cold rolled to 3 mm. This 3 mm plate was subjected to intermediate annealing by raising the temperature and changing the temperature-decreasing rate to 100 ° C. and maintaining the temperature at 425 ° C. for 10 seconds to obtain an O material.
Next, it cold-rolled to thickness 1mm (rolling rate 67%). This 1 mm plate was subjected to final annealing by maintaining the temperature at 425 ° C. for 10 seconds while increasing the temperature and changing the temperature decrease rate to 100 ° C.
Next, flatness was obtained through a tension leveler and cut into 100 mm × 100 mm to prepare a sample for the next anodic oxide film treatment.
陽極酸化皮膜処理工程は以下のとおりである。   The anodized film treatment process is as follows.
各試料の表面を有機溶剤で洗浄して脱脂し、液温50℃、8%苛性ソーダ水溶液に2分浸漬して苛性処理し、水洗後液温20℃、10質量%硝酸水溶液に1分浸漬して中和した。このようにして前処理した各試料を、次に浴温18℃、15質量%硫酸浴、電流密度1A/dm2、処理時間を振らせて種々厚さの酸化皮膜を生成させた。水洗後95℃の温水で封孔処理し乾燥させた。次いでMINOLTA CM508i装置で色調を測定した。結果を表2に示す。 The surface of each sample is washed with an organic solvent and degreased, immersed in an 8% aqueous solution of caustic soda for 2 minutes at a liquid temperature of 50 ° C., caustically treated, and after washing with water, immersed in an aqueous nitric acid solution at 20 ° C. for 10 minutes. Neutralized. Each sample pretreated in this way was then subjected to a bath temperature of 18 ° C., a 15 mass% sulfuric acid bath, a current density of 1 A / dm 2 , and a treatment time to produce oxide films of various thicknesses. After washing with water, it was sealed with warm water at 95 ° C. and dried. The color tone was then measured with a MINOLTA CM508i instrument. The results are shown in Table 2.
表2の結果より、Al−Mg合金でCrが規定範囲内であれば含有していても、中間焼鈍および最終焼鈍処理の昇温および降温速度が共に規定速度以上である本発明例(試料番号2−1,2−2,2−3の内の本発明例)は、陽極酸化皮膜の色調が黄色味の抑制された淡緑白色であることが判る。一方、Cr量が規定範囲より大きく外れている比較例(試料番号2−4)は、昇温および降温速度が共に規定速度以上であってもPCR値も高く黄色味の強い灰色になっていることが判る。
また、皮膜厚さを規定範囲を超える15μmとした比較例(試料番号2−1,2−2,2−3の皮膜厚さ15μm)は緑色味と黄色味が強く発色してしまうことが判る。
更に、化学組成が本発明例であっても、昇温および降温速度のいずれかが規定範囲より遅い場合(試料番号2−5,2−6)は、PCR値も高く黄色味の強い灰色になっていることが判る。
From the results shown in Table 2, the present invention example (sample number) in which both the temperature rise and temperature drop rates of the intermediate annealing and the final annealing treatment are equal to or higher than the specified speed even if Cr is contained within the specified range in the Al—Mg alloy. Examples of the present invention (2-1, 2-2, 2-3) show that the color tone of the anodic oxide film is light green-white with yellowness suppressed. On the other hand, in the comparative example (sample number 2-4) in which the Cr amount is greatly out of the specified range, even if the temperature rising and cooling rates are both higher than the specified speed, the PCR value is high and the yellowish gray is strong. I know that.
Moreover, it turns out that the green color and the yellowish color develop strongly in the comparative example (film thickness 15 μm of sample numbers 2-1, 2-2, 2-3) in which the film thickness exceeds 15 μm. .
Moreover, even the chemical composition is a present invention embodiment, if any of the heating and cooling rate is slower than the specified range (Sample No. 2-5 and 2-6), the strong high yellowish be P CR value gray It turns out that it is.
前記<4>の工程で製造される板を用いて更に説明する。
表1に示す組成の合金溶湯を溶製後、フィルターを通してDC鋳造法を行い厚さ560mmの圧延用鋳塊を得た。この鋳塊の表面を10mm面削し、440℃の温度に2時間保持し、さらに加熱して540℃の温度に4時間保持して均質化処理した。
It demonstrates further using the board manufactured at the process of said <4>.
After melting the molten alloy having the composition shown in Table 1, a DC casting method was performed through a filter to obtain a rolling ingot having a thickness of 560 mm. The surface of the ingot was chamfered by 10 mm, held at a temperature of 440 ° C. for 2 hours, further heated and held at a temperature of 540 ° C. for 4 hours for homogenization.
次いで各鋳塊の熱間圧延を530℃の温度で開始し、厚さ6mmまで圧延した。熱間圧延終了時の熱延板の温度は360℃であった。   Next, hot rolling of each ingot was started at a temperature of 530 ° C. and rolled to a thickness of 6 mm. The temperature of the hot rolled sheet at the end of hot rolling was 360 ° C.
該6mmの圧延板を冷間で1.5mmまで圧延した。この1.5mm板を昇温速度および100℃までの降温速度をそれぞれ変えて425℃の温度に10秒保持して中間焼鈍しO材とした。   The 6 mm rolled plate was cold rolled to 1.5 mm. The 1.5 mm plate was subjected to intermediate annealing by changing the temperature rising rate and the temperature decreasing rate up to 100 ° C. for 10 seconds, and was subjected to intermediate annealing to obtain an O material.
次に厚さ1mm(圧延率33%)まで冷間圧延した。この1mm板を昇温および100℃までの降温速度を変動させて220℃の温度に10秒保持して安定化焼鈍した。   Next, it cold-rolled to thickness 1mm (rolling rate 33%). This 1 mm plate was stabilized and annealed by maintaining the temperature at 220 ° C. for 10 seconds while increasing the temperature and changing the temperature decrease rate to 100 ° C.
次にテンションレベラをとおして平坦度を出し、100mm×100mmに切断して、実施例1と同様に陽極酸化皮膜処理した。その後、実施例1と同様に色調を測定した。結果を表3に示す   Next, the flatness was obtained through a tension leveler, cut into 100 mm × 100 mm, and anodized film treatment was performed in the same manner as in Example 1. Thereafter, the color tone was measured in the same manner as in Example 1. The results are shown in Table 3.
表3の結果より、Al−Mg合金でCrが規定範囲内であれば含有していても、中間焼鈍および安定化焼鈍処理の昇温および降温速度が共に規定速度以上である本発明例(試料番号3−1,3−2,3−3の内の本発明例)は、陽極酸化皮膜の色調が黄色味の抑制された淡緑白色であることが判る。   From the results of Table 3, the present invention example (sample) in which both the temperature rise and temperature drop rates of the intermediate annealing and the stabilized annealing treatment are equal to or higher than the specified rate even if Cr is contained within the specified range in the Al—Mg alloy It can be seen that the examples of the present invention (numbers 3-1, 3-2, and 3-3) are light green white in which the color tone of the anodized film is suppressed to yellow.
一方、Cr量が規定範囲より大きく外れている比較例(試料番号3−4)は、昇温および降温速度が共に規定速度以上であってもPCR値も高く黄色味の強い灰色になっていることが判る。 On the other hand, in the comparative example (sample number 3-4) in which the Cr amount is significantly out of the specified range, even if the temperature rising and cooling rates are both higher than the specified speed, the PCR value is high and the yellowish gray is strong. I know that.
また、皮膜厚さを規定範囲を超える15μmとした比較例(試料番号3−1,3−2,3−3の皮膜厚さ15μm)は、緑色味と黄色味が強く発色してしまうことが判る。   Further, in the comparative example (the film thickness of 15 μm of sample numbers 3-1, 3-2, and 3-3) in which the film thickness exceeds 15 μm, the green color and the yellow color may be strongly colored. I understand.
更に、化学組成が本発明例であっても、昇温および降温速度のいずれかが規定範囲より遅い場合(試料番号3−5,3−6)は、PCR値も高く黄色味の強い灰色になっていることが判る。
なお、実施例1および2で実証した<2>および<4>以外の前記<1>、<3>、<5>および<6>で説明される工程で製造された規定範囲内の組成のアルミニウム合金板に関しては、冷延圧延後の全ての焼鈍処理に際して、昇温および降温速度を100℃/秒以上とすることで、規定範囲内の陽極酸化後の色調が規定内のL値、a値、b値が得られ、目視で黄色味のない淡緑白色が得られたことが確認されている。
Moreover, even the chemical composition is a present invention embodiment, if any of the heating and cooling rate is slower than the specified range (Sample No. 3-5, 3-6) are strong high yellowish be P CR value gray It turns out that it is.
In addition, the composition within the specified range manufactured in the steps described in <1>, <3>, <5> and <6> other than <2> and <4> demonstrated in Examples 1 and 2 For aluminum alloy sheets, the temperature after heating and cooling is 100 ° C./second or more in all annealing processes after cold rolling, so that the color tone after anodization within the specified range is within the specified L * value, The a * value and b * value were obtained, and it was confirmed that a pale green white with no yellowishness was obtained visually.
実施例2の条件で製板した試料番号3−2の冷間圧延後1mmの板において、冷間圧延後の安定化焼鈍を施さない冷間圧延後1日目の板と10日目の板の機械的性質、および冷間圧延後の安定化焼鈍を施した安定化焼鈍後1日目の板と、10日目の板の機械的性質を測定した。結果を表4に示す。   In the plate 1 mm after the cold rolling of sample number 3-2 made under the conditions of Example 2, the plate on the first day after the cold rolling and the plate on the 10th day without the stabilization annealing after the cold rolling The mechanical properties of the plate on the first day after the stabilization annealing and the plate on the tenth day after the stabilization annealing were measured. The results are shown in Table 4.
表4の結果より、安定化焼鈍を施した板(試料番号4−2)の機械的性質は10日経ても安定しているのに対して、安定化焼鈍を施していない板(試料番号4−1)の機械的性質は10日も経ると大きく変動していることが判る。   From the results of Table 4, the mechanical properties of the plate subjected to stabilization annealing (Sample No. 4-2) are stable even after 10 days, whereas the plate not subjected to stabilization annealing (Sample No. 4). It can be seen that the mechanical properties of -1) fluctuate greatly after 10 days.
本発明によれば、硫酸浴による陽極酸化処理しても黄色味発色を極力抑えることができ、かつ紅色味を帯びない淡緑白色系に発色するアルミニウム合金板およびその製造方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, even if it anodizes with a sulfuric acid bath, the aluminum alloy plate which can suppress yellowish color development as much as possible, and develops the light green-white color which does not have a reddish taste, and its manufacturing method are provided.

Claims (4)

  1. Mg2.0〜3.0質量%、Cr0.15〜0.25質量%、Ti0.005〜0.20質量%、またはTi0.005〜0.20質量%およびB0.0005〜0.05質量%を含有し、残部Alおよび不可避不純物からなり、該不純物中のSiを0.15質量%以下、Feを0.4質量%以下、Mnを0.06質量%以下とし、前記Crの含有量をTCR質量%、Crの固溶量をSCR質量%としたとき、TCR−SCRの値PCRが、PCR≦0.065質量%であることを特徴とするアルミニウム合金板。 Mg 2.0-3.0 mass%, Cr 0.15-0.25 mass%, Ti 0.005-0.20 mass%, or Ti 0.005-0.20 mass% and B 0.0005-0.05 mass% The balance is made of Al and inevitable impurities, Si in the impurities is 0.15 mass% or less, Fe is 0.4 mass% or less, Mn is 0.06 mass% or less, and the Cr content is T CR wt%, when the solid solution amount of Cr was S CR wt%, the value P CR of T CR -S CR is, the aluminum alloy plate, which is a P CR ≦ 0.065 wt%.
  2. 請求項1記載のアルミニウム合金板に硫酸陽極酸化皮膜が3〜12μm被覆されていることを特徴とする陽極酸化皮膜を備えたアルミニウム合金板。   An aluminum alloy plate provided with an anodized film, wherein the aluminum alloy plate according to claim 1 is coated with a 3 to 12 μm sulfuric acid anodized film.
  3. 請求項1記載の組成からなる鋳塊を均質化処理後に熱間圧延し、その後の冷間圧延後の全ての焼鈍処理において、昇温および降温速度を100℃/秒以上とすることを特徴とするアルミニウム合金板の製造方法。   The ingot having the composition according to claim 1 is hot-rolled after homogenization treatment, and in all annealing treatments after the subsequent cold-rolling, the temperature increase and decrease rate is 100 ° C./second or more. A method for manufacturing an aluminum alloy plate.
  4. 請求項3記載の方法により得られたアルミニウム合金板に硫酸陽極酸化皮膜を3〜12μm被覆することを特徴とする陽極酸化皮膜を備えたアルミニウム合金板の製造方法。   A method for producing an aluminum alloy plate provided with an anodized film, wherein the aluminum alloy plate obtained by the method according to claim 3 is coated with a sulfuric acid anodized film in an amount of 3 to 12 µm.
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