JP3880693B2 - Aluminum material excellent in glitter and manufacturing method thereof - Google Patents
Aluminum material excellent in glitter and manufacturing method thereof Download PDFInfo
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Description
【0001】
【発明の属する技術分野】
本発明は、自動車用ホイール材に好適な光輝性に優れたアルミニウム材に関するものである。
【0002】
【従来の技術】
2輪車を含む自動車等の車両に用いられるホイールは、軽量化による燃費の向上や運動性能の向上、またはデザイン性からアルミホイールの使用が活発である。このアルミホイールのデザインに関して、表面の光の反射性、すなわち光輝性を向上させたものが、主に3ピースホイールで高級品として販売されている。
光輝性向上の手法には、ダイヤモンドバイトで表面を精密切削仕上し、無色クロメートで下地処理した後、クリヤー塗料を塗布する方法やクロムメッキ等のメッキ処理を行う方法、または、バフ研磨処理した後に化学研磨処理し、さらにアルマイト処理で光輝性を得る方法等がある。このなかで、切削処理によるものは下地処理や塗料により光輝性が低下するため満足できる光輝性は得られない。また、メッキによるものは、メッキ膜の密着性を向上させるために多層メッキが必要とされ、コスト高となる問題がある。一方、化学研磨とアルマイトで仕上げる場合には、素材であるアルミの質感を生かし、コスト的にも適当であることから、この処理方法で光輝性が得られる素材が強く要求されている。
【0003】
【発明が解決しようとする課題】
ところで、化学研磨とアルマイトを組み合わせて光輝性を得る方法においては、素材のFe含有量が低いほど、アルマイト処理した際のFeのアルマイト膜への取り込みによる光輝性の低下の程度は低いことが知られており、光輝性を高めるためにFe含有量を0.02%以下にしたアルミニウム材が開発されている。しかし、素材のFe含有量を低下させるためには、地金の純度を高純度化させることが必要であり、このためコスト(材料費)が高いものになってしまうという問題がある。
本発明は、上記事情を背景としてなされたものであり、低コストで優れた光輝性を得ることができるアルミニウム材を提供することを目的とする。
【0004】
【課題を解決するための手段】
上記課題を解決するため、本発明の光輝性に優れたアルミニウム材のうち第1の発明は、材料組成が、重量%で、Mg:2.5〜3.5%、Cu:0.005〜0.09%、Cr:0.10〜0.25%、Fe:0.040%以下、Si:0.040%以下を含有し、残部がAlと不可避不純物からなることを特徴とする。
【0005】
第2の発明は、材料組成が、重量%で、Mg:2.5〜3.5%、Cu:0.005〜0.09%、Cr:0.10〜0.25%、Fe:0.040%以下、Si:0.040%以下を含有し、残部がAlと不可避不純物からなり、該不可避不純物中で、Mn、Zn、Niがそれぞれ0.02%以下であることを特徴とする。
光輝性に優れたアルミニウム材の製造方法の発明は、材料組成が、重量%で、Mg:2.5〜3.5%、Cu:0.005〜0.09%、Cr:0.10〜0.25%、Fe:0.040%以下、Si:0.040%以下を含有し、残部がAlと不可避不純物からなるアルミニウム合金に熱間圧延、冷間圧延をした後、300〜450℃で1〜8時間焼鈍し、その後、20℃/hr以上の冷却速度で冷却することを特徴とする。
【0006】
本発明は、成分の選定により、Fe含有量を格別に低減することを必須とすることなく低コストで光輝性を向上させることができる。以下に、各成分の具体的な作用および限定理由を説明する。
【0007】
[1]Mg含有量:2.5〜3.5%
MgはAlに対して高い固溶度を有し、合金の強度を高めるために添加する。Mgの含有量が2.5%未満では材料強度(例えばホイール材としての強度)が不足する。一方、3.5%を越えると応力腐食割れの危険が生じるため、上記範囲に限定する。なお、同様の理由で、下限を2.8%、上限を3.3%とするのが望ましい。
【0008】
[2]Cu含有量:0.005〜0.09%
Cuは材料の溶解電位を調整するために添加する。Cuは微量な添加でも溶解電位に大きく影響を及ぼすが、Cu添加量が0.005%未満では、圧延により生じる結晶粒毎の溶解電位のばらつきが化学研磨処理に影響し、結晶毎に溶解速度の差を生じて粗面化し、化学研磨での光輝性が得られないので、0.005%以上の含有が望ましい。一方、Cu含有量が0.09%を越えると、電位に及ぼす作用は飽和する傾向になり大きな効果が期待できないため、Cu含有量は0.09%以下にする必要がある。
【0009】
また、Cu量が増えるに連れて、熱間圧延や焼鈍処理においてAl−Mg−Cu系の析出が生じて化学研磨表面の光輝性を低下させ、またアルマイト膜も着色させる作用が増大するが、0.09%を越える含有では上記作用が顕著になる。しかも電位調整作用も0.15%付近をピークとしてそれ以上含有量を増やしても却って電位調整作用は低減するので、Cu含有量は0.09%以下とする。
なお、材料の電位を調整し、さらにAl−Mg−Cu系の析出が問題とならないようにするという観点から両者をバランスさせ、Cu含有量は、下限を0.005%、上限を0.09%とする。
【0010】
[3]Cr含有量:0.10〜0.25%
Crは化学研磨表面の光輝性を増すために添加される。
すなわち、Feが含有される合金にはFe系の晶出物(主に鋳造で生成)が含まれるが、この化合物は溶解電位が高く、回りのアルミニウム地よりも溶け難いことから、化学的な研磨時に溶解速度の差によって晶出物の回りにピット状に凹凸が形成される。この凹凸は、最終的に光輝性を阻害する。特に、析出物を避けるために、Cu量を上記ピ−ク値よりも少なくすると、アルミニウム地の溶解電位は一層低くなってFe晶出物との差が増大する。そこで、Cu、Crを適正量にしてアルミニウム地の溶解電位をFe系晶出物のそれに近い値に調整すると、アルミニウム地と晶出部との溶解速度が同程度になり、化学的な研磨によってアルミニウム材表面がほぼ均一に溶解されてミクロ的にも平滑な研磨面が得られる。この平滑面により材料の光輝性が優れたものになる。
【0011】
なお、Cr含有量が0.10%未満であると上記した電位調整の効果が不十分となるので、下限を0.10%とする。一方、Cr含有量が0.25%を越えると巨大な金属間化合物が形成されるようになり、成形性や疲労強度を低下させるとともにアルマイト膜を着色させて光輝性を低下させるので、上限は0.25%に定める。
なお、上記と同様の理由で、上限を0.20%とするのが望ましい。
【0012】
不可避不純物
本発明のアルミニウム材は、上記成分および残部Alの他に、不可避不純物を含有する。以下に、不可避不純物に関し記述する。
[4]Fe含有量:0.040%以下
Feは不可避不純物として材料に含有されるものであるが、その含有量は低ければ低いほど、Fe晶出物に起因した凹凸形状が避けられ、光輝性は優れたものとなる。なお、上記Cu、Cr量の一方または両方を適切に調整することにより、Fe含有量を従来のように格別に低減(0.020%以下)しないでも良好な光輝性を得ることができ、例えば、0.030%程度のFeを含有するものにおいても良好な光輝性が得られる。ただし、Fe含有量が0.040%を越えると、Fe晶出物が多量に生成されるため、上記Cu、Cr量の調整によってもその凹凸形状を十分に解消することが困難になり、よってアルマイト膜の着色が大きくなり光輝性は大きく低下してしまう。したがって、Fe含有量の上限を0.040%とする。
また、Fe含有量の低減は、Cu、Cr量の調整がなされていない場合に比べれば光輝性向上効果は小さいものの、本発明においても、その低減は光輝性の向上に寄与するので、コストよりも光輝性を重視する場合には、Fe含有量を十分に低減することも可能である。ただし、Fe含有量を0.010%未満に低下させても光輝性の向上効果は次第に小さくなり、一方、原料としての地金純度は益々要求が高くなり、コスト的にも極めて不利になるため、Fe含有量の下限は0.010%とするのが望ましい。
【0013】
[5]Si含有量:0.040%以下
Siも不純物として材料に取り込まれるものであり、Feと同様の理由で制限する必要があり、その上限を0.040%とする。なお、工業性を考慮すれば、下限を0.005%とするのが望ましい。
【0014】
[6]Ti含有量:0.0001〜0.02%
Tiは結晶粒を均一かつ微細化する作用があり、必要に応じて単独で、またはBとともに溶製時に添加することができる。ただし、その含有量が0.0001%未満下ではその効果が小さく、0.02%越ではその効果が飽和するとともに、化学研磨面にピットを形成したりアルマイト膜を着色させて光輝性を低下させるので、不純物として含有されるTi量を上記範囲に定めるのが望ましい。
また、その他の不可避不純物中で、Mn、Zn、Niをそれぞれ0.02%以下とするのが望ましい。これは、これらの成分が0.02%を越えると、晶出物が生成されて光輝性を低下させるためである。
【0015】
【発明の実施の形態】
本発明のアルミニウム材は、常法により製造することができ、所定の成分に調整した上で溶製され、所望の熱間圧延、冷間圧延等を経て製品化される。
なお、冷間圧延により硬化した材料を、ホイールに成形可能なレベルにまで軟化させるために焼鈍処理を行うことができ、この焼鈍処理では、上記軟化とともに結晶粒の大きさを調整することができる。ただし、この焼鈍処理では、Al−Mg−Cu系の析出が生じるので、より良好な光輝性を得るために焼鈍温度と時間及び冷却速度を適正に管理することが望ましい。
【0016】
すなわち、焼鈍温度が300℃よりも低い場合には、焼鈍の効果を十分に得るためや結晶粒を適正な大きさにするために、より長時間の焼鈍処理が必要となり、Al−Mg−Cu系の析出が増加して光輝性が大きく低下する。一方、焼鈍温度が450℃を越えるとAl−Mg−Cu系の析出物の量が増して光輝性を低下させる。したがって、焼鈍処理は、300〜450℃の温度範囲内で行うのが望ましい。
そして、焼鈍時間が1時間未満であると、焼鈍が十分になされず、また8時間を超えて長時間加熱すると、上記析出が顕著になるため、焼鈍時間を1〜8時間とするのが望ましい。
また、焼鈍後の冷却速度が20℃/hrよりも低下すると、Al−Mg−Cu系の析出が増加し光輝性を大きく低下させるので、焼鈍後は、20℃/hr以上の冷却速度で冷却するのが望ましい。なお、冷却時の上記析出は、250〜350℃温度域で顕著に起こるので、この温度域では、より速い冷却速度(例えば60℃/hr以上)とすることもできる。なお、250℃未満では、上記析出は殆ど起こらないので、250℃よりも低い温度になれば、冷却速度を規制しないことも可能である。
【0017】
その後は、鍛造、プレス成形等の二次成形加工を経てホイール等が得られる。二次成形加工後は、常法により光輝処理をすることができる。例えば、アルミニウム材の表面を切削や研磨により鏡面化する。
なお、本発明材としては、鏡面化に際し、仕上げ研磨として化学研磨を行うのが望ましい。これは、Cu、Cr量の調整により、Fe晶出物やその他の析出物とマトリックス地との溶解電位差が小さくなっているので、化学研磨時に表面が一様に溶解して平滑な研磨面を得ることができるためである。したがって、バフ研磨等の粗研磨を行った後、化学研磨を行うことにより低コストで鏡面化することができる。なお、化学研磨自体は常法により行うことができる。また、化学的な研磨を行うという点で、電解研磨を採用することも可能であり、上記化学研磨と同様に、研磨によって良好な平滑面を得ることができる。
【0018】
上記鏡面処理後には、必要に応じてアルミニウム材表面を脱脂処理した後、水洗し、常法によりアルマイト処理を行うことができる。上記一連の光輝性処理により、質感を持ち、かつ光輝性に優れた製品を得ることができる。
なお、本発明の材料は、前記したように光輝性を持たせた高級な自動車ホイールに好適であるが、この用途に限定されるものではなく、光輝性を要求される他の用途への適用も可能である。
【0019】
【実施例】
以下に、本発明の一実施例を説明する。
表1に示す供試材を常法により溶製し、所定の熱間加工、冷間加工を経た後、380℃×4時間の焼鈍処理を行い、その後、30℃/hrの冷却速度で冷却した。さらに、各供試材を50×50mm2に切断し、エメリー#1000で研磨した後、0.3μmのアルミナで研磨し、さらにラサ工業株式会社製の化学研磨処理液(商品名:ラサブライト)で化学研磨処理して鏡面に仕上げた。ついで、15%硫酸中で16Vの電解を行い、アルマイト膜を3μm形成して光輝性処理を行った。
【0020】
光輝性処理を行った各供試材について、以下の方法で反射率および光輝性の評価を行い、その結果を表2に示した。
[評価方法]
(1)光沢度計で銀鏡を100%とした際の鏡面反射率をアルマイト処理後に測定し、その数値を表に示した。
(2)光輝性は表面の光沢と色味を含めた目視評価を行った。評価では、○:光輝性に優れる △:やや着色が感じられる ×:光輝性は劣るものとして判定し、その結果を、○、△、×により表中に示した。
【0021】
【表1】
【0022】
【表2】
【0023】
表の結果より、発明材はいずれも反射率において比較材よりも高い数値を示しており、光輝性の目視評価ではさらに顕著な差異が認められた。
【0024】
【発明の効果】
以上説明したように、本発明のアルミニウム材によれば、材料組成を、重量%で、Mg:2.5〜3.5%、Cu:0.005〜0.09%、Cr:0.10〜0.25%、Fe:0.040%以下、Si:0.040%以下を含有し、残部がAlと不可避不純物からなるものとしたので、晶出物および析出物による光輝性の低下が避けられ、Feの含有量を格別に低減することなく低コストで優れた光輝性を得ることが可能になる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum material having excellent luster suitable for an automobile wheel material.
[0002]
[Prior art]
Aluminum wheels are actively used for wheels used in vehicles such as automobiles including two-wheeled vehicles because of the improvement in fuel consumption, the improvement of exercise performance, and the design. With regard to the design of this aluminum wheel, the one with improved surface light reflectivity, that is, glitter, is mainly sold as a three-piece wheel as a luxury product.
To improve glossiness, the surface is precisely cut with a diamond bite, and after applying a base treatment with colorless chromate, a method of applying a clear paint, a method of plating such as chrome plating, or after buffing There are methods such as chemical polishing treatment and alumite treatment to obtain glitter. Among these, the effect of cutting treatment cannot be obtained because the glittering property is lowered by the base treatment or the paint. In addition, the plating method requires a multi-layer plating in order to improve the adhesion of the plating film, which increases the cost. On the other hand, in the case of finishing with chemical polishing and anodizing, the material that can provide the glitter by this processing method is strongly demanded because it uses the texture of aluminum as a material and is suitable in terms of cost.
[0003]
[Problems to be solved by the invention]
By the way, in the method of obtaining glitter by combining chemical polishing and alumite, it is known that the lower the Fe content of the material, the lower the degree of reduction in glitter due to incorporation of Fe into the alumite film during alumite treatment. In order to improve the glitter, an aluminum material having an Fe content of 0.02% or less has been developed. However, in order to reduce the Fe content of the raw material, it is necessary to increase the purity of the metal, and thus there is a problem that the cost (material cost) becomes high.
The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide an aluminum material that can obtain excellent glitter at low cost.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first invention among the aluminum materials excellent in glitter of the present invention has a material composition of wt%, Mg: 2.5-3.5%, Cu: 0.005- It contains 0.09% , Cr: 0.10 to 0.25%, Fe: 0.040% or less, Si: 0.040% or less, and the balance is made of Al and inevitable impurities.
[0005]
In the second invention, the material composition is Mg: 2.5-3.5%, Cu: 0.005-0.09 % , Cr: 0.10-0.25%, Fe: 0% by weight. 0.040% or less, Si: 0.040% or less, the balance being made of Al and inevitable impurities, wherein Mn, Zn and Ni are each 0.02% or less in the inevitable impurities .
The invention of the manufacturing method of the aluminum material excellent in glitter is the material composition in weight%, Mg: 2.5-3.5%, Cu: 0.005-0.09%, Cr: 0.10 0.25%, Fe: 0.040% or less, Si: 0.040% or less, with the balance being 300% to 450 ° C. 1 to 8 hours, and then cooled at a cooling rate of 20 ° C./hr or more.
[0006]
According to the present invention, by selecting the components, it is possible to improve the glitter at a low cost without making it essential to reduce the Fe content. Below, the concrete effect | action and limitation reason of each component are demonstrated.
[0007]
[1] Mg content: 2.5 to 3.5%
Mg has a high solid solubility with respect to Al and is added to increase the strength of the alloy. If the Mg content is less than 2.5%, the material strength (for example, strength as a wheel material) is insufficient. On the other hand, if it exceeds 3.5%, there is a risk of stress corrosion cracking, so it is limited to the above range. For the same reason, it is desirable to set the lower limit to 2.8% and the upper limit to 3.3%.
[0008]
[2] Cu content: 0.005 to 0.09%
Cu is added to adjust the dissolution potential of the material. Even if Cu is added in a small amount, the dissolution potential is greatly affected. However, if the Cu addition amount is less than 0.005%, the dispersion of the dissolution potential for each crystal grain caused by rolling affects the chemical polishing treatment, and the dissolution rate for each crystal. In this case, the surface is roughened and the glossiness in chemical polishing cannot be obtained. Therefore, the content is preferably 0.005% or more. On the other hand, if the Cu content exceeds 0.09% , the effect on the potential tends to saturate and a great effect cannot be expected, so the Cu content needs to be 0.09% or less.
[0009]
In addition, as the amount of Cu increases, Al-Mg-Cu-based precipitation occurs in hot rolling and annealing treatments, and the effect of coloring the alumite film is increased. When the content exceeds 0.09% , the above effect becomes remarkable. Moreover, even if the potential adjusting action is peaked at around 0.15% and the content is further increased, the potential adjusting action is reduced, so the Cu content is set to 0.09% or less.
It should be noted that, from the viewpoint of adjusting the potential of the material and preventing the precipitation of Al-Mg-Cu system from becoming a problem, the Cu content is 0.005% for the lower limit and 0.09 for the upper limit. % .
[0010]
[3] Cr content: 0.10 to 0.25%
Cr is added pressure to increase the luster of the chemical polishing surface.
That is, the Fe-containing alloy contains Fe-based crystallized products (mainly produced by casting), but this compound has a high dissolution potential and is less soluble than the surrounding aluminum ground. Due to the difference in dissolution rate during polishing, pits and projections are formed around the crystallized product. This unevenness ultimately inhibits the glitter. In particular, in order to avoid precipitates, if the amount of Cu is made smaller than the above peak value, the dissolution potential of the aluminum base is further lowered and the difference from the Fe crystallized product is increased. Therefore, by adjusting the dissolution potential of the aluminum base to a value close to that of the Fe-based crystallized substance with appropriate amounts of Cu and Cr, the dissolution rate of the aluminum base and the crystallized portion becomes the same, and by chemical polishing The surface of the aluminum material is dissolved almost uniformly, so that a smooth polished surface can be obtained even on a microscopic level. This smooth surface makes the material excellent in glitter.
[0011]
If the Cr content is less than 0.10 %, the effect of the potential adjustment described above becomes insufficient, so the lower limit is made 0.10% . On the other hand, if the Cr content exceeds 0.25%, a huge intermetallic compound will be formed, and the moldability and fatigue strength will be lowered and the alumite film will be colored to reduce the glitter, so the upper limit is Set to 0.25%.
Incidentally, for the same reason as described above, the upper limit desired for the 0.20% arbitrariness.
[0012]
Inevitable Impurities The aluminum material of the present invention contains inevitable impurities in addition to the above components and the balance Al. The following describes inevitable impurities.
[4] Fe content: 0.040 % or less Fe is contained in the material as an inevitable impurity, but the lower the content, the more the uneven shape caused by the Fe crystallized substance is avoided, and the brighter The property is excellent. In addition, by appropriately adjusting one or both of the Cu and Cr amounts, it is possible to obtain good glitter even without reducing the Fe content (0.020% or less) as in the prior art. Even in the case of containing about 0.030% Fe, good glitter can be obtained. However, if the Fe content exceeds 0.040 %, a large amount of Fe crystallized material is generated, so that it becomes difficult to sufficiently eliminate the uneven shape by adjusting the Cu and Cr amounts. The coloring of the alumite film becomes large and the glitter is greatly reduced. Therefore, the upper limit of the Fe content is 0.040%.
In addition, although the reduction in Fe content is less effective in improving luster than in the case where the amounts of Cu and Cr are not adjusted, in the present invention, the reduction contributes to the improvement in luster. However, when emphasis is placed on glitter, the Fe content can be sufficiently reduced. However, even if the Fe content is reduced to less than 0.010%, the effect of improving the luster is gradually reduced, while the purity of the bullion as a raw material becomes more demanding and extremely disadvantageous in terms of cost. The lower limit of the Fe content is preferably 0.010%.
[0013]
[5] Si content: 0.040% or less Si is also taken into the material as an impurity and must be restricted for the same reason as Fe, and the upper limit is made 0.040%. In consideration of industrial properties, the lower limit is preferably 0.005%.
[0014]
[6] Ti content: 0.0001 to 0.02%
Ti has the effect of making the crystal grains uniform and fine, and can be added alone or together with B at the time of melting as required. However, if the content is less than 0.0001%, the effect is small, and if it exceeds 0.02%, the effect is saturated, and pits are formed on the chemically polished surface or the alumite film is colored to reduce the glitter. Therefore, it is desirable to set the amount of Ti contained as an impurity within the above range.
Further, among other inevitable impurities, Mn, Zn, and Ni are each preferably 0.02% or less. This is because when these components exceed 0.02%, a crystallized product is generated to reduce the glitter.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The aluminum material of the present invention can be produced by a conventional method, adjusted to a predetermined component, melted, and commercialized through desired hot rolling, cold rolling and the like.
In addition, in order to soften the material hardened | cured by cold rolling to the level which can be shape | molded in a wheel, an annealing process can be performed, In this annealing process, the magnitude | size of a crystal grain can be adjusted with the said softening. . However, since the Al—Mg—Cu-based precipitation occurs in this annealing treatment, it is desirable to appropriately manage the annealing temperature, time, and cooling rate in order to obtain better glitter.
[0016]
That is, when the annealing temperature is lower than 300 ° C., in order to sufficiently obtain the effect of annealing or to make the crystal grains have an appropriate size, a longer annealing treatment is required, and Al—Mg—Cu The precipitation of the system increases and the glitter is greatly reduced. On the other hand, when the annealing temperature exceeds 450 ° C., the amount of Al—Mg—Cu-based precipitates increases and the glitter is lowered. Therefore, it is desirable to perform the annealing process within a temperature range of 300 to 450 ° C.
And, if the annealing time is less than 1 hour, the annealing is not sufficiently performed, and if the heating is performed for more than 8 hours for a long time, the above-described precipitation becomes remarkable. Therefore, the annealing time is desirably 1 to 8 hours. .
Further, if the cooling rate after annealing is lower than 20 ° C./hr, precipitation of Al—Mg—Cu system is increased and the glitter is greatly reduced. Therefore, after annealing, cooling is performed at a cooling rate of 20 ° C./hr or more. It is desirable to do. In addition, since the said precipitation at the time of cooling occurs notably in a 250-350 degreeC temperature range, it can also be set as a faster cooling rate (for example, 60 degreeC / hr or more) in this temperature range. In addition, since the said precipitation hardly arises at less than 250 degreeC, if it becomes temperature lower than 250 degreeC, it is also possible not to regulate a cooling rate.
[0017]
Thereafter, a wheel or the like is obtained through secondary forming processing such as forging and press forming. After the secondary forming process, the glittering treatment can be performed by a conventional method. For example, the surface of an aluminum material is mirror-finished by cutting or polishing.
In addition, as this invention material, it is desirable to perform chemical polishing as final polishing in the case of mirror-finishing. This is because by adjusting the amount of Cu and Cr, the dissolution potential difference between the Fe crystallized product and other precipitates and the matrix is reduced, so that the surface is uniformly dissolved during chemical polishing, resulting in a smooth polished surface. This is because it can be obtained. Therefore, after rough polishing such as buffing, chemical polishing can be performed to achieve a mirror finish at low cost. Chemical polishing itself can be performed by a conventional method. Moreover, it is also possible to employ | adopt electrolytic polishing at the point of performing chemical polishing, and a favorable smooth surface can be obtained by grinding | polishing similarly to the said chemical polishing.
[0018]
After the mirror surface treatment, the surface of the aluminum material can be degreased if necessary, then washed with water, and anodized by a conventional method. By the above series of glitter treatment, a product having a texture and excellent in glitter can be obtained.
The material of the present invention is suitable for high-grade automobile wheels having glitter as described above, but is not limited to this application, and is applicable to other applications that require glitter. Is also possible.
[0019]
【Example】
An embodiment of the present invention will be described below.
Sample materials shown in Table 1 were melted by a conventional method, and after a predetermined hot working and cold working, an annealing treatment was performed at 380 ° C. for 4 hours, and then cooled at a cooling rate of 30 ° C./hr. did. Further, each test material was cut into 50 × 50 mm 2 , polished with Emery # 1000, then polished with 0.3 μm alumina, and further with a chemical polishing solution (trade name: Rasaburite) manufactured by Rasa Industry Co., Ltd. The surface was mirror polished by chemical polishing. Next, electrolysis was performed at 16 V in 15% sulfuric acid to form an alumite film having a thickness of 3 μm, and a glitter treatment was performed.
[0020]
With respect to each specimen subjected to the glitter treatment, the reflectance and the glitter were evaluated by the following methods, and the results are shown in Table 2.
[Evaluation methods]
(1) The specular reflectance when the silver mirror was 100% with a gloss meter was measured after anodizing, and the numerical values are shown in the table.
(2) The glitter was visually evaluated including surface gloss and color. In the evaluation, ◯: excellent in radiance Δ: slightly colored is felt ×: the shine is determined to be inferior, and the result is shown in the table by ◯, Δ, ×.
[0021]
[Table 1]
[0022]
[Table 2]
[0023]
From the results of the table, all of the inventive materials showed higher values in reflectance than the comparative materials, and a further remarkable difference was observed in the visual evaluation of the glitter.
[0024]
【The invention's effect】
As described above, according to the aluminum material of the present invention, the material composition is Mg: 2.5-3.5%, Cu: 0.005-0.09 % , Cr: 0.10 in weight%. ˜0.25%, Fe: 0.040% or less, Si: 0.040% or less, and the balance is made of Al and inevitable impurities. Thus, it is possible to obtain excellent glitter at a low cost without significantly reducing the Fe content.
Claims (3)
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JP19499497A JP3880693B2 (en) | 1997-07-04 | 1997-07-04 | Aluminum material excellent in glitter and manufacturing method thereof |
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JP19499497A JP3880693B2 (en) | 1997-07-04 | 1997-07-04 | Aluminum material excellent in glitter and manufacturing method thereof |
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JP5099677B2 (en) * | 2007-03-20 | 2012-12-19 | 三菱アルミニウム株式会社 | Method for producing glittering aluminum alloy material |
CN110475882A (en) * | 2017-04-05 | 2019-11-19 | 诺维尔里斯公司 | With high-intensitive and high formability anodic oxidation quality 5XXX aluminium alloy and preparation method |
CN116904785B (en) * | 2023-09-13 | 2023-12-01 | 湖南卓创精材科技股份有限公司 | Aluminum magnesium alloy mirror surface material, preparation method and application |
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