JP5842295B2 - 7000 series aluminum alloy extruded material for housing - Google Patents
7000 series aluminum alloy extruded material for housing Download PDFInfo
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- JP5842295B2 JP5842295B2 JP2011121092A JP2011121092A JP5842295B2 JP 5842295 B2 JP5842295 B2 JP 5842295B2 JP 2011121092 A JP2011121092 A JP 2011121092A JP 2011121092 A JP2011121092 A JP 2011121092A JP 5842295 B2 JP5842295 B2 JP 5842295B2
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- 239000000463 material Substances 0.000 title claims description 25
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 21
- 239000013078 crystal Substances 0.000 claims description 17
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052726 zirconium Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 description 14
- 238000007743 anodising Methods 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000010301 surface-oxidation reaction Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241001085205 Prenanthella exigua Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Other Surface Treatments For Metallic Materials (AREA)
- Extrusion Of Metal (AREA)
Description
本発明は、ノート型パソコン、携帯電話、デジタルカメラ等の筐体に用いられる７０００系アルミニウム合金押出材に関する。 The present invention relates to a 7000 series aluminum alloy extruded material used for casings of notebook personal computers, mobile phones, digital cameras and the like.
一般に、ノート型パソコン、携帯電話、デジタルカメラ等の筐体に用いられる素材には、良好な外観性を有し、軽量化のため又は落下時の筐体の変形防止のため高い強度を有することが必要とされている。このような観点から、これらの筐体にはアルミニウム合金が多用されており、通常、表面に陽極酸化処理を施して用いられることが多い。
下記特許文献１〜９には、各種合金系に属するアルミニウム合金板材又は押出材について、表面に陽極酸化処理を施して種々の用途に用いることが記載されている。
In general, the materials used in the case of notebook computers, mobile phones, digital cameras, etc. have good appearance and high strength to reduce weight or prevent deformation of the case when dropped. Is needed. From such a point of view, aluminum alloys are frequently used in these cases, and usually the surface is often used after anodizing.
The following Patent Documents 1 to 9 describe that an aluminum alloy sheet material or extruded material belonging to various alloy systems is subjected to anodizing treatment on the surface and used for various applications.
７０００系アルミニウム合金は各種合金系の中でも強度が高いため、部材の軽量化及び高強度化に適している。例えば特許文献９には、表面層が再結晶組織で内部が繊維状組織である７０００系アルミニウム合金押出材が高強度であり、アルマイト（陽極酸化処理）色調にも優れていることが記載されている。
一方、前記ノート型パソコン、携帯電話、デジタルカメラ等の筐体は、特に良好な外観性と精密性及び製品の頑丈さが要求される場合など、厚板状のアルミニウム合金を切削加工し、全表面削り出しで成形される。しかし、このような成形方法を上記の７０００系アルミニウム合金押出材に適用し、成形された筐体の表面に陽極酸化処理を施した場合、表面の一部又は全部に目視観察される筋状の色むら（光沢の濃淡）が生じたり、陽極酸化処理被膜が黄色みを帯びるなど、外観性を低下させることが問題となっている。
Since the 7000 series aluminum alloy has high strength among various alloy series, it is suitable for reducing the weight and strength of the member. For example, Patent Document 9 describes that a 7000 series aluminum alloy extruded material having a recrystallized surface layer and a fibrous structure inside has high strength and excellent alumite (anodizing) color tone. Yes.
On the other hand, for cases such as laptop computers, mobile phones, digital cameras, etc., especially when good appearance and precision and robustness of the product are required, the thick plate-like aluminum alloy is cut and processed. Molded by surface cutting. However, when such a molding method is applied to the above-mentioned 7000 series aluminum alloy extruded material and the surface of the molded casing is anodized, a streak that is visually observed on part or all of the surface. There is a problem that the appearance is deteriorated such as uneven color (glossy shade) or yellowing of the anodized film.
従って、本発明は、７０００系アルミニウム合金押出材を切削加工（削り出し）で筐体に加工した後、表面に陽極酸化処理を施す場合に、被膜に色むらが生じるのを防止し、かつ、黄色みを抑えたシルバー色の被膜を得ることを目的とする。 Accordingly, the present invention prevents the occurrence of uneven color in the coating when the surface is subjected to anodization after the 7000 series aluminum alloy extruded material is processed into a casing by cutting (machining), and The object is to obtain a silver-colored film with reduced yellowness.
本発明に係る筐体用７０００系アルミニウム合金押出材は、切削加工で筐体に加工された後、表面に陽極酸化処理皮膜が形成されるものであって、Ｚｎ：５．５〜７．５質量％、Ｍｇ：１．２〜２．２質量％、Ｔｉ：０．０１〜０．１％質量を含有し、Ｍｎ、Ｃｒ、Ｚｒが合計０．０５質量％以下、Ｃｕが０．１０質量％以下に規制され、残部Ａｌ及び不可避的不純物からなり、断面全体が再結晶組織である等軸晶からなる。 A 7000 series aluminum alloy extruded material for a casing according to the present invention is formed into a casing by cutting, and then an anodized film is formed on the surface. Zn: 5.5 to 7.5 Mass%, Mg: 1.2-2.2 mass%, Ti: 0.01-0.1% by mass, Mn, Cr, Zr total 0.05 mass% or less, Cu 0.10 mass %, And the remainder is made of equiaxed crystals having a recrystallized structure.
上記アルミニウム合金押出材を用いて、切削加工（削り出し）で筐体に加工した後、表面に陽極酸化処理を施した場合に、陽極酸化処理被膜に色むらが生じるのが防止でき、かつ、黄色みを帯びない又は黄色みを抑えたシルバー色の陽極酸化処理被膜が得られる。
上記アルミニウム合金押出材は、Ｔ５又はＴ６処理を行うことで、引張強さが４００〜６００Ｎ／ｍｍ２、耐力が３００〜５００Ｎ／ｍｍ２の高強度を得ることができる。
Using the aluminum alloy extrudate, after processing into a housing by cutting (cutting out), when anodizing the surface, it can prevent color unevenness from occurring in the anodized film, and A silver-colored anodized film that is not yellowish or suppresses yellowishness is obtained.
The aluminum alloy extruded material, by performing T5 or T6 treatment, the tensile strength of 400~600N / mm 2, it is possible to yield strength to obtain a high strength of 300~500N / mm 2.
本発明に係る７０００系アルミニウム合金押出材の合金組成及び組織等について、以下説明する。
（Ｚｎ）
Ｚｎは、熱処理後の強度を確保するため、５．５質量％以上添加する必要がある。しかし、７．５％を超えると押出性が低下する。従って、Ｚｎ含有量は５．５〜７．５質量％とする。
（Ｍｇ）
Ｍｇは、Ｚｎと共に熱処理後の強度を確保するため、１．２質量％以上添加する必要がある。しかし、２．２質量％を超えると押出性が低下する。従って、Ｍｇ含有量は１．２〜２．２質量％とする。
（Ｔｉ）
Ｔｉは、鋳塊組織の微細化のために添加される。Ｔｉ含有量が０．０１質量％より少ないと、微細化の効果が十分でなく、０．１質量％より多いと飽和して巨大化合物が晶出するおそれがある。従って、Ｔｉの含有量は０．０１％〜０．１質量％とする。
The alloy composition and structure of the 7000 series aluminum alloy extruded material according to the present invention will be described below.
(Zn)
Zn needs to be added in an amount of 5.5% by mass or more in order to ensure the strength after the heat treatment. However, if it exceeds 7.5%, the extrudability decreases. Therefore, Zn content shall be 5.5-7.5 mass%.
(Mg)
Mg needs to be added in an amount of 1.2% by mass or more in order to ensure the strength after heat treatment together with Zn. However, if it exceeds 2.2% by mass, the extrudability decreases. Therefore, Mg content shall be 1.2-2.2 mass%.
(Ti)
Ti is added to refine the ingot structure. If the Ti content is less than 0.01% by mass, the effect of miniaturization is not sufficient. If the Ti content is more than 0.1% by mass, the compound may be saturated and a giant compound may be crystallized. Therefore, the Ti content is set to 0.01% to 0.1% by mass.
（Ｍｎ、Ｃｒ、Ｚｒ）
一般に７０００系アルミニウム合金押出材では、耐ＳＣＣ（応力腐食割れ）性及び強度を高めるため、Ｍｎ、Ｃｒ、Ｚｒ等の遷移元素を合計で０．１５〜０．５質量％程度添加し、押出方向に伸張した繊維状組織を形成させている。しかし、断面全体が繊維状組織である押出材の表面に陽極酸化処理を施すと、陽極酸化処理被膜に筋状の色むらが生じるという問題がある。一方、前記特許文献９では、合金に所定量のＣｒ及びＺｒを添加し、かつ押出前後に特殊な熱処理を加えることで、押出材の表面のみを再結晶化し、これにより陽極酸化処理被膜の色むらを防止している。しかし、このような押出材を切削加工（削り出し）して筐体を成形すると、筐体の表面の一部又は全部に繊維状組織が露出し、そのためこの筐体に陽極酸化処理を施したとき、先に述べたとおり、陽極酸化処理被膜にやはり色むらが生じてしまう。
(Mn, Cr, Zr)
In general, in order to improve the SCC (stress corrosion cracking) resistance and strength in a 7000 series aluminum alloy extruded material, transition elements such as Mn, Cr, and Zr are added in a total amount of about 0.15 to 0.5% by mass, and the extrusion direction. An elongated fibrous structure is formed. However, when the surface of the extruded material whose entire cross section is a fibrous structure is anodized, there is a problem that streaky color unevenness occurs in the anodized film. On the other hand, in Patent Document 9, a predetermined amount of Cr and Zr is added to the alloy, and a special heat treatment is applied before and after extrusion, so that only the surface of the extruded material is recrystallized. Unevenness is prevented. However, when the casing is formed by cutting (cutting out) such an extruded material, the fibrous structure is exposed on a part or all of the surface of the casing, and thus the casing is anodized. In some cases, as described above, color unevenness also occurs in the anodized film.
従って、本発明では、不可避不純物として含まれるＭｎ、Ｃｒ、Ｚｒの合計含有量を０．０５質量％以下に規制し、押出材の断面全体を再結晶組織である等軸晶からなるものとする。断面全体が等軸晶組織からなるのであれば、押出材を切削加工して筐体を成形した場合でも、筐体の表面は全面が等軸晶組織のままであり、この筐体の表面に陽極酸化処理を施したとき、陽極酸化処理被膜に色むらが生じるのが防止できる。
本発明において等軸晶組織とは、平均アスペクト比が４．０以下の結晶粒からなる組織であり、平均アスペクト比は、押出方向に平行で板厚方向に垂直な断面において、押出方向に測定した平均結晶粒径をａとし、板厚方向に測定した平均結晶粒径をｂとしたとき、ａ／ｂ又はｂ／ａで表される。平均アスペクト比の測定は、例えば表層部、１／４板厚部、１／２板厚部のように断面を代表する複数の領域を選定し、全ての領域で平均アスペクト比が４．０以下のとき、断面全体が等軸晶組織であると定義する。平均アスペクト比は、全ての領域で３．０以下が望ましい。平均結晶粒径の測定は、ＪＩＳＨ０５０１の切断法に準じて行えばよい。
Therefore, in the present invention, the total content of Mn, Cr, and Zr contained as inevitable impurities is regulated to 0.05% by mass or less, and the entire cross section of the extruded material is made of equiaxed crystals that are recrystallized structures. . If the entire cross section has an equiaxed crystal structure, even when the casing is formed by cutting the extruded material, the entire surface of the casing remains the equiaxed crystal structure. When the anodizing treatment is performed, it is possible to prevent uneven color from occurring in the anodized film.
In the present invention, the equiaxed crystal structure is a structure composed of crystal grains having an average aspect ratio of 4.0 or less. The average aspect ratio is measured in the extrusion direction in a cross section parallel to the extrusion direction and perpendicular to the plate thickness direction. When the average crystal grain size measured is a and the average crystal grain size measured in the thickness direction is b, it is expressed as a / b or b / a. For the measurement of the average aspect ratio, for example, a plurality of regions representing a cross section such as a surface layer portion, a 1/4 plate thickness portion, and a 1/2 plate thickness portion are selected, and the average aspect ratio is 4.0 or less in all the regions. In this case, it is defined that the entire cross section has an equiaxed crystal structure. The average aspect ratio is desirably 3.0 or less in all regions. The average crystal grain size may be measured according to the cutting method of JISH0501.
（Ｃｕ）
Ｃｕは、不可避不純物としてアルミニウム合金に含まれ、あるいは強度を高めるため必要に応じて添加されるが、いずれにしても本発明では０．１０質量％以下に規制する。Ｃｕ含有量が増加すると陽極酸化処理被膜が黄色みを帯びてくるので、本発明のように黄色みを抑えたシルバー色の陽極酸化処理被膜を望む場合は、Ｃｕ含有量は０．１０質量％以下に規制する必要がある。黄色みを帯びず白色に近いシルバー色の陽極酸化処理被膜を得るには、Ｃｕ含有量は０．０５質量％以下とすることが望ましい。
（その他）
その他の不可避不純物元素については、通常使用される７０００系アルミニウム合金に含まれる量であれば、陽極酸化処理被膜の色調、色むら等に影響はない。
(Cu)
Cu is contained in the aluminum alloy as an inevitable impurity, or is added as necessary to increase the strength. In any case, Cu is restricted to 0.10% by mass or less. As the Cu content increases, the anodized film becomes yellowish. Therefore, when a silver-colored anodized film with reduced yellowness is desired as in the present invention, the Cu content is 0.10% by mass. It is necessary to regulate the following. In order to obtain a silver-colored anodized film that is not yellowish and nearly white, the Cu content is preferably 0.05% by mass or less.
(Other)
Other unavoidable impurity elements are not affected by the color tone and color unevenness of the anodized film as long as they are contained in a commonly used 7000 series aluminum alloy.
（陽極酸化処理被膜）
本発明に係る筐体に形成される陽極酸化処理被膜の色調は、ＪＩＳＺ８７３０に記載のハンター色差式による明度指数Ｌ*（Ｌ*値）、及びクロマティクネス指数（ａ*値、ｂ*値）で表される（例えば特許文献３，４等参照）。なお、Ｌ*値は１００が上限で数値が高いほど明るい色調となる。ａ*値は０を基準にプラス側で数値が高いほど赤色みを帯び、マイナス側で数値が高いほど緑色みを帯びる。ｂ*値は０を基準にプラス側で数値が高いほど黄色みを帯び、マイナス側で数値が高いほど青色みを帯びる。
本発明に係る筐体では、陽極酸化処理皮膜の色調として、明るく白色に近いシルバー色を目標としており、これを上記Ｌ*、ａ*、ｂ*で表すと、６５＜Ｌ*＜９５、−１．５＜ａ*＜１．５、−１．５＜ｂ*＜１．５である。この色調は、本発明の組成及び結晶組織を有する７０００系アルミニウム合金押出材で得ることができる。黄色みに関係するｂ*値はｂ*＜１．０がより好ましい。
(Anodized film)
The color tone of the anodized film formed on the housing according to the present invention is a brightness index L * (L * value) and a chromaticness index (a * value, b * value) according to the Hunter color difference formula described in JISZ8730. (For example, see Patent Documents 3 and 4). The L * value has an upper limit of 100, and the higher the value, the brighter the tone. The a * value becomes reddish as the numerical value is higher on the positive side with respect to 0, and becomes greener as the numerical value is higher on the negative side. The b * value becomes yellowish as the numerical value is higher on the positive side with respect to 0, and becomes bluer as the numerical value is higher on the negative side.
In the casing according to the present invention, the color tone of the anodized film is targeted to be a silver color that is bright and close to white. When expressed as L *, a *, and b *, 65 <L * <95, − 1.5 <a * <1.5 and −1.5 <b * <1.5. This color tone can be obtained with a 7000 series aluminum alloy extruded material having the composition and crystal structure of the present invention. The b * value related to yellowness is more preferably b * <1.0.
陽極酸化処理被膜は被膜厚さによりシルバー色の濃度が変化し、本発明に係る筐体では皮膜厚さは３〜３０μｍであることが好ましい。陽極酸化処理被膜は薄いほど安価になるが、十分なシルバー色が得られないことがあり、また、３μｍ未満では陽極酸化処理被膜を安定して形成するのが困難となる。一方、陽極酸化処理被膜の厚さが３０μｍを超えると、コスト高になるとともに、変形したとき被膜にクラックが発生しやすくなり、また陽極酸化処理被膜のシルバー色が濃くなり過ぎ、上記の明るく白色に近いシルバー色が得られなくなる。 The concentration of the silver color of the anodized film varies depending on the film thickness, and the film thickness is preferably 3 to 30 μm in the casing according to the present invention. The thinner the anodized film, the lower the cost. However, a sufficient silver color may not be obtained, and if it is less than 3 μm, it becomes difficult to stably form the anodized film. On the other hand, if the thickness of the anodized film exceeds 30 μm, the cost increases, cracks are likely to occur in the deformed film, and the silver color of the anodized film becomes too dark, resulting in the bright white color described above. A silver color close to is not obtained.
次に、本発明の実施例を説明する。
先ず、下記表１に示す組成のアルミニウム合金鋳塊を通常の方法により溶製した。Ａ４、Ａ５、Ｂ２、Ｂ３にはＣｕを添加し、Ｂ４にはＭｎ、Ｃｒ、Ｚｒを添加した。その他の組成でもＣｕ、Ｍｎ、Ｃｒ、Ｚｒが不可避不純物として微量に含まれ、Ｆｅ、Ｓｉも不可避不純物である。各アルミニウム合金鋳塊に対し４７０℃×４ｈの均質化処理を施し、押出温度が４７０℃、押出速度が１０ｍ／ｍｉｎの条件で押出加工を行い、いずれも押出直後に材料をファン空冷（冷却速度約１００℃／ｍｉｎ）で冷却し、肉厚１０ｍｍ×幅９０ｍｍの押出材（押出板）を得た。その後、９０℃×３ｈ→１４０℃×８ｈの条件で高温時効処理を施した。
Next, examples of the present invention will be described.
First, an aluminum alloy ingot having the composition shown in Table 1 below was melted by an ordinary method. Cu was added to A4, A5, B2, and B3, and Mn, Cr, and Zr were added to B4. Even in other compositions, Cu, Mn, Cr, and Zr are contained in trace amounts as inevitable impurities, and Fe and Si are also inevitable impurities. Each aluminum alloy ingot was homogenized at 470 ° C x 4h, and extrusion was performed under conditions of an extrusion temperature of 470 ° C and an extrusion speed of 10m / min. It was cooled at about 100 ° C./min) to obtain an extruded material (extruded plate) having a thickness of 10 mm × width of 90 mm. Thereafter, high temperature aging treatment was performed under the conditions of 90 ° C. × 3 h → 140 ° C. × 8 h.
これを供試材としてミクロ組織観察を実施し、下記要領で結晶粒の平均アスペクト比を測定した。その結果を表１に示す。
（平均アスペクト比）
平均アスペクト比を測定する領域として、押出方向に平行で板厚方向に垂直な断面の表層部、１／４ｔ部、１／２ｔ部を選定し、各領域においてＪＩＳＨ０５０１の切断法に準拠して押出方向及び板厚方向の平均結晶粒径を測定し、押出方向の平均結晶粒径をａとし、板厚方向の平均結晶粒径をｂとしたとき、平均アスペクト比はａ／ｂ又はｂ／ａの大きい方の値とした。平均アスペクト比の測定範囲は、表層部では最表面から板厚方向に６００μｍ×押出方向に９００μｍの範囲、１／４ｔ部と１／２ｔ部では、それぞれ板厚１／４ｔと１／２ｔのラインを中心として板厚方向内外に３５０μｍ×押出方向に４５０μｍの範囲を選定した。供試材Ａ２のミクロ組織を図１に示す。なお、供試材の表層部、１／４ｔ部、１／２ｔ部における板面に平行な面でも、前記断面とほぼ同様のミクロ組織が得られている。
The microstructure was observed using this as a test material, and the average aspect ratio of the crystal grains was measured as follows. The results are shown in Table 1.
(Average aspect ratio)
As the area for measuring the average aspect ratio, the surface layer part, 1 / 4t part and 1 / 2t part of the cross section parallel to the extrusion direction and perpendicular to the sheet thickness direction are selected, and the extrusion is performed in accordance with the cutting method of JISH0501 in each area. When the average crystal grain size in the direction and the plate thickness direction is measured, the average crystal grain size in the extrusion direction is a, and the average crystal grain size in the plate thickness direction is b, the average aspect ratio is a / b or b / a The larger value was used. The measurement range of the average aspect ratio is 600 μm in the plate thickness direction from the outermost surface in the surface layer portion, 900 μm in the extrusion direction, and the line thickness of 1/4 t and 1/2 t in the 1/4 t portion and 1/2 t portion, respectively. A range of 350 μm inside and outside the plate thickness direction × 450 μm in the extrusion direction was selected. The microstructure of the specimen A2 is shown in FIG. Note that the same microstructure as that of the cross-section is obtained on the surface of the test material, which is parallel to the plate surface in the surface layer portion, 1 / 4t portion, and 1 / 2t portion.
次に、得られた各供試材について、下記要領で引張試験及び陽極酸化処理を実施し、かつ陽極酸化処理皮膜について色調の測定及び色むらの評価を行った。その結果を表２に示す。
（引張試験）
引張試験片は押出方向に平行方向にＪＩＳ５号試験片を採取して引張試験を行い、引張強さ（σB）と耐力（σ0.2）を測定した。引張強さ（σB）が４００〜６００Ｎ／ｍｍ２、耐力（σ0.2）が３００〜５００Ｎ／ｍｍ２を合格と判定した。
（陽極酸化処理）
押出材の表面を３ｍｍフライス加工し、前処理として濃度５％、液温６０℃の水酸化ナトリウム水溶液に１分間浸漬した後、濃度３０％、液温２０℃の硝酸水溶液に１分間浸漬した。その後、濃度１５％、液温２０℃の硫酸水溶液に浸漬し、２．０Ａ／ｄｍ２の付加電流を１０分かけて、フライス加工した表面に陽極酸化処理を行った。その後、封孔処理として、濃度５％、液温９０℃の酢酸Ｎｉ水溶液に２０分浸漬した。陽極酸化被膜の厚さは８μｍであった。
Next, the obtained specimens were subjected to a tensile test and an anodizing treatment in the following manner, and the color tone of the anodized film was evaluated and the color unevenness was evaluated. The results are shown in Table 2.
(Tensile test)
Tensile test specimens were taken from a JIS No. 5 specimen parallel to the extrusion direction and subjected to a tensile test, and the tensile strength (σB) and proof stress (σ0.2) were measured. A tensile strength (σB) of 400 to 600 N / mm 2 and a proof stress (σ0.2) of 300 to 500 N / mm 2 were determined to be acceptable.
(Anodizing treatment)
The surface of the extruded material was milled by 3 mm, and as a pretreatment, immersed in an aqueous sodium hydroxide solution having a concentration of 5% and a liquid temperature of 60 ° C. for 1 minute, and then immersed in an aqueous nitric acid solution having a concentration of 30% and a liquid temperature of 20 ° C. for 1 minute. Then, the surface was dipped in a sulfuric acid aqueous solution having a concentration of 15% and a liquid temperature of 20 ° C., and an anodizing treatment was performed on the milled surface by applying an additional current of 2.0 A / dm 2 over 10 minutes. Then, as a sealing treatment, it was immersed in a Ni acetate aqueous solution having a concentration of 5% and a liquid temperature of 90 ° C. for 20 minutes. The thickness of the anodized film was 8 μm.
（色調の測定）
陽極酸化処理した押出材の色調は、先に述べたとおり、ＪＩＳＺ８７３０の規定に準拠し、Ｌ*ａ*ｂ*表色系による色差計（コニカミノルタ社製、ＣＮ−６００ｄ）を用いて、ＳＣＩ方式（正反射光込み）により、Ｌ*値、ａ*値、ｂ*値を測定した。
（色むらの評価）
色むらの評価は、目視により○△×の３段階で評価した。○は色むらなし、△はわずかに色むらあり、×は色むらありで、○△が合格である。
(Measurement of color tone)
As described above, the color tone of the anodized extruded material conforms to the provisions of JISZ8730, and uses a color difference meter (CN-600d, manufactured by Konica Minolta Co., Ltd.) based on the L * a * b * color system. L * value, a * value, and b * value were measured by a method (including regular reflection light).
(Evaluation of uneven color)
The evaluation of color unevenness was visually evaluated in three stages of △△ ×. ○ indicates no color unevenness, Δ indicates slight color unevenness, × indicates color unevenness, and ○ Δ indicates pass.
表１，２に示されるように、合金組成が本発明の規定を満たし、断面全体が等軸晶組織からなるＡ１〜Ａ４は、強度が高く、表面酸化処理被膜の色調（Ｌ*、ａ*、ｂ*）が先に記載した目標の範囲内で、明るく白色に近いシルバー色であり、色むらも認められなかった。同じくＡ５は強度が高く、色むらが認められなかったが、表面酸化処理被膜のｂ*値が目標の範囲内で比較的高く、色調がわずかに黄色みを帯びていた。これはＣｕ含有量が規定範囲内で比較的高かったためと考えられる。また、Ａ６は強度が高く、表面酸化処理被膜の色調が明るく白色に近いシルバー色であったが、表面酸化処理被膜に色むらがわずかに認められた。これは等軸状組織の平均アスペクト比が許容範囲内で比較的大きかったためと考えられる。 As shown in Tables 1 and 2, A1 to A4 in which the alloy composition satisfies the provisions of the present invention and the entire cross section has an equiaxed crystal structure has high strength, and the color tone (L *, a *) of the surface oxidation-treated film. B *) is bright and close to white in the target range described above, and no color unevenness was observed. Similarly, A5 had high strength and no color unevenness was observed, but the b * value of the surface oxidation-treated film was relatively high within the target range, and the color tone was slightly yellowish. This is presumably because the Cu content was relatively high within the specified range. A6 was high in strength and the color of the surface oxidation-treated film was bright and close to white, but slight color unevenness was observed in the surface-oxidized film. This is presumably because the average aspect ratio of the equiaxed structure was relatively large within the allowable range.
一方、Ｍｇ、Ｚｎの含有量が本発明の規定より少ないＢ１は強度が低い。
Ｃｕ含有量が本発明の規定より多いＢ２，Ｂ３は、高い強度が得られるものの、陽極酸化処理被膜のｂ*値が高く、黄色みを帯びていた。
Ｍｎ、Ｃｒ、Ｚｒの合計添加量が本発明の規定より多いＢ４は、断面に繊維状組織が目立ち、平均アスペクトが大きく（測定困難）、色むらの発生が認められた。
On the other hand, B1, which contains less Mg and Zn than in the present invention, has low strength.
B2 and B3 having a Cu content higher than that defined in the present invention were high in strength, but the b * value of the anodized film was high and yellowish.
B4 in which the total amount of addition of Mn, Cr, and Zr is larger than that of the present invention has a noticeable fibrous structure in the cross section, a large average aspect (measurement is difficult), and occurrence of uneven color.
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