JP4592465B2 - Aluminum alloy clad material for foil containers - Google Patents
Aluminum alloy clad material for foil containers Download PDFInfo
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- JP4592465B2 JP4592465B2 JP2005088663A JP2005088663A JP4592465B2 JP 4592465 B2 JP4592465 B2 JP 4592465B2 JP 2005088663 A JP2005088663 A JP 2005088663A JP 2005088663 A JP2005088663 A JP 2005088663A JP 4592465 B2 JP4592465 B2 JP 4592465B2
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- 239000000463 material Substances 0.000 title claims description 71
- 239000011888 foil Substances 0.000 title claims description 34
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 22
- 239000011162 core material Substances 0.000 claims description 48
- 238000005260 corrosion Methods 0.000 claims description 35
- 230000007797 corrosion Effects 0.000 claims description 35
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- 239000012535 impurity Substances 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 235000013305 food Nutrition 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000013555 soy sauce Nutrition 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 description 1
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 235000021056 liquid food Nutrition 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Description
本発明は、耐食性（耐腐食性）に優れた箔容器用クラッド材に関する。 The present invention relates to a clad material for a foil container having excellent corrosion resistance (corrosion resistance).
従来、アルミニウム箔容器は、携帯用容器だけでなく、食品を盛るために広く使用されている。このアルミニウム箔容器の１つとして、側壁にしわのついた「しわ付き箔容器」がある。この「しわ付き箔容器」は、しわによって強度が確保されるために容器強度に優れ、大量の食品（特に流動性食品、薄肉食品等）収容する容器として使用されている。 Conventionally, aluminum foil containers are widely used not only for portable containers but also for serving foods. As one of the aluminum foil containers, there is a “wrinkled foil container” in which a side wall is wrinkled. The “wrinkled foil container” is excellent in container strength because strength is ensured by wrinkles, and is used as a container for storing a large amount of food (particularly fluid food, thin food, etc.).
しわ付き箔容器は、アルミニウム箔を打ち抜きした後、絞り加工して所定のしわ付き容器を形成し、次いで材料のしわをできる限り伸ばさずにダイに押し込んで均一なしわを発生させた後、縁巻きを行って成形する。このときに使用されるアルミニウム箔は、しわ付き箔容器の強度を確保するためにＭｎを含むＡｌ合金（例えば３０００番系のＡｌ合金）が使用されている。 A wrinkled foil container is formed by punching an aluminum foil and drawing it to form a predetermined wrinkled container, and then pressing the material into a die without stretching it as much as possible to generate uniform wrinkles. Wind and mold. The aluminum foil used at this time is an Al alloy containing Mn (for example, No. 3000 series Al alloy) in order to ensure the strength of the wrinkled foil container.
しかし、液汁を含む流動性食品又は薄肉食品をしわ付き箔容器に入れたまま加熱して殺菌し、冷凍して長期間保存した後、再び直接オーブンで加熱して食するなど、しわ付き箔容器が塩分を含んだ液汁とともに長期間接触状態に保持されることが多い。このとき、塩分を含んだ液汁は、加熱時の高温多湿状態化での箔容器のアルミニウムを腐食させ、腐食穴が発生する。この問題に対し、すきま腐食性の向上を図るため、純アルミニウム、Ａｌ−Ｚｎ系合金、Ａｌ−Ｍｇ系合金、Ａｌ−Ｚｎ−Ｍｇ系合金を皮材とし、Ｍｎを含む３０００番系のＡｌ合金を芯材とした複合アルミニウム箔が提案されている（特許文献１）。 However, wrinkled foil containers such as liquid foods containing liquid juice or thin-walled foods that are put in wrinkled foil containers, sterilized by heating, frozen, stored for a long time, and then directly heated in an oven to eat. Are often kept in contact with the salt-containing juice for a long period of time. At this time, the liquid juice containing salt corrodes the aluminum of the foil container in a high-temperature and high-humidity state during heating, and corrosion holes are generated. In order to improve the crevice corrosion resistance to this problem, the number 3000 series Al alloy containing Mn is used, with pure aluminum, Al—Zn alloy, Al—Mg alloy, and Al—Zn—Mg alloy as the skin. There has been proposed a composite aluminum foil having a core material (Patent Document 1).
また、Ｍｇ：０．１〜２．０質量％、Ｃｒ：０．０３〜０．５質量％含有し、所望によりＴｉ、Ｍｎ、Ｃｕ、Ｓｉ、Ｆｅの１種以上を含有し、残部がＡｌ及び不可避不純物からなる芯材をＣｒ：０．０１〜０．０５質量％、Ｔｉ：０．０５〜０．５質量％含有し、所望によりＭｇ、Ｃｕ、Ｓｉ、Ｆｅ、Ｚｎの１種以上を含有し、残部がＡｌ及び不可避不純物からなる皮材で被覆した複合アルミニウム箔で構成したしわ付き箔容器が提案されている（特許文献２）。
しかしながら、これら従来技術においても、耐食性という点においては、なお改善の余地が残されている。 However, these prior arts still have room for improvement in terms of corrosion resistance.
従って、本発明の主な目的は、より耐食性に優れた箔容器用アルミニウム合金クラッド材を提供することにある。 Accordingly, a main object of the present invention is to provide an aluminum alloy clad material for a foil container that is more excellent in corrosion resistance.
本発明者は、従来技術の問題点に鑑みて鋭意研究を重ねた結果、することにより上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies in view of the problems of the prior art, the present inventor has found that the above object can be achieved, and has completed the present invention.
すなわち、本発明は、下記の箔容器用アルミニウム合金クラッド材に係る。
１． 芯材及び前記芯材の両面に皮材をクラッドしてなるクラッド材であって、
（１）前記芯材が、Ｆｅ：０．２〜０．４重量％、Ｓｉ：０．０５〜０．２５重量％、Ｃｕ：０．３重量％以下、Ｍｎ：０．０４〜０．１重量％及びＭｇ：２．２〜２．８重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなり、
（２）前記皮材が、Ｆｅ：０．２〜０．４重量％、Ｃｕ：０．０５重量％以下及びＳｉ：０．０２〜０．１５重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなる、
ことを特徴とする箔容器用アルミニウム合金クラッド材。
２． 前記芯材の孔食電位が前記皮材の孔食電位よりも貴であり、かつ、前記芯材と前記皮材との孔食電池差が５０〜１１０ｍＶである、前記項１に記載の箔容器用アルミニウム合金クラッド材。
３． 塩分濃度が０．５重量％以上の内容物を収容するための箔容器に用いられる前記項１又は２に記載の箔容器用アルミニウム合金クラッド材。
That is, the present invention relates to the following aluminum alloy clad material for foil containers.
1. A clad material formed by clad a skin material on both sides of a core material and the core material,
(1) The core material is Fe: 0.2 to 0.4 wt%, Si: 0.05 to 0.25 wt%, Cu: 0.3 wt% or less, Mn: 0.04 to 0.1 Containing aluminum and Mg: 2.2 to 2.8% by weight, the balance being aluminum and inevitable impurities,
(2) The skin material contains Fe: 0.2 to 0.4 wt%, Cu: 0.05 wt% or less, and Si: 0.02 to 0.15 wt%, with the balance being aluminum and inevitable impurities Made of an aluminum alloy,
An aluminum alloy clad material for a foil container.
2. The foil according to Item 1, wherein the pitting corrosion potential of the core material is more noble than the pitting corrosion potential of the skin material, and the pitting corrosion battery difference between the core material and the skin material is 50 to 110 mV. Aluminum alloy clad material for containers.
3. Item 3. The aluminum alloy clad material for a foil container according to Item 1 or 2, which is used for a foil container for containing a content having a salt concentration of 0.5% by weight or more.
本発明のクラッド材によれば、特定の合金組成を有する芯材及び皮材との組み合わせを採用しているので、従来品よりも優れた耐食性を実現することができる。とりわけ、芯材と皮材との孔食電位差を一定値に制御する場合には、いっそう高い耐食性を得ることができる。 According to the clad material of the present invention, since a combination of a core material and a skin material having a specific alloy composition is employed, corrosion resistance superior to that of the conventional product can be realized. In particular, when the pitting corrosion potential difference between the core material and the skin material is controlled to a constant value, higher corrosion resistance can be obtained.
このため、本発明クラッド材は、例えば塩分（ＮａＣｌ濃度０．５重量％以上、特に２重量％以上、さらに８重量％以上、さらに１０重量％以上）を含む内容物の容器として好適に用いることができる。より具体的には、塩分を含む食品用の容器として有効である。本発明のクラッド材は、これらの内容物に対しても優れた耐食性を長期にわたり発揮することができる。 For this reason, the clad material of the present invention is suitably used as a container for contents containing, for example, salt (NaCl concentration of 0.5% by weight or more, particularly 2% by weight or more, further 8% by weight or more, further 10% by weight or more). Can do. More specifically, it is effective as a container for food containing salt. The clad material of the present invention can exhibit excellent corrosion resistance for these contents over a long period of time.
本発明の箔容器用アルミニウム合金クラッド材は、芯材及び前記芯材の両面に皮材をクラッドしてなるクラッド材であって、
（１）前記芯材が、Ｆｅ：０．２〜０．４重量％、Ｓｉ：０．０５〜０．２５重量％、Ｃｕ：０．３重量％以下、Ｍｎ：０．０４〜０．１重量％及びＭｇ：２．２〜２．８重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなり、
（２）前記皮材が、Ｆｅ：０．２〜０．４重量％、Ｃｕ：０．０５重量％以下及びＳｉ：０．０２〜０．１５重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなる、
ことを特徴とする。
The aluminum alloy clad material for a foil container of the present invention is a clad material formed by clad a skin material on both surfaces of a core material and the core material,
(1) The core material is Fe: 0.2 to 0.4 wt%, Si: 0.05 to 0.25 wt%, Cu: 0.3 wt% or less, Mn: 0.04 to 0.1 Containing aluminum and Mg: 2.2 to 2.8% by weight, the balance being aluminum and inevitable impurities,
(2) The skin material contains Fe: 0.2 to 0.4 wt%, Cu: 0.05 wt% or less, and Si: 0.02 to 0.15 wt%, with the balance being aluminum and inevitable impurities Made of an aluminum alloy,
It is characterized by that.
芯材
芯材は、Ｆｅ：０．２〜０．４重量％、Ｓｉ：０．０５〜０．２５重量％、Ｃｕ：０．３重量％以下、Ｍｎ：０．０４〜０．１重量％及びＭｇ：２．２〜２．８重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなる。
Core material : Fe: 0.2-0.4% by weight, Si: 0.05-0.25% by weight, Cu: 0.3% by weight or less, Mn: 0.04-0.1% by weight And Mg: 2.2 to 2.8% by weight, with the balance being aluminum and an aluminum alloy with inevitable impurities.
以下に芯材の各成分の主な役割を示す。ただし、本発明の効果は、各成分が相乗的に作用することにより得られるものであることから、必ずしも下記の役割に限定されるものではない。 The main role of each component of a core material is shown below. However, since the effects of the present invention are obtained by the synergistic action of each component, they are not necessarily limited to the following roles.
Ｆｅは、０．２〜０．４重量％とし、好ましくは０．２〜０．３５重量％とする。Ｆｅの配合により、特に芯材の強度を高めることができる。従って、Ｆｅ量が０．２重量％未満の場合は、所望の強度を得ることができない。また、Ｆｅ量が０．４重量％を超えると芯材の耐食性が低下する。 Fe is 0.2 to 0.4% by weight, preferably 0.2 to 0.35% by weight. In particular, the strength of the core material can be increased by adding Fe. Therefore, when the amount of Fe is less than 0.2% by weight, a desired strength cannot be obtained. On the other hand, if the amount of Fe exceeds 0.4% by weight, the corrosion resistance of the core material decreases.
Ｓｉは、０．０５〜０．２５重量％とし、好ましくは０．０５〜０．２０重量％とする。Ｓｉの配合により、主としてＭｇと反応してＭｇ2Ｓｉを析出し、これにより芯材の強度を高めることができる。従って、Ｓｉ量が０．０５重量％未満の場合は、所望の強度を得ることができない。また、Ｓｉ量が０．２５重量％を超える加工性が低下するとともに、耐食性も低下するという問題が生じる。 Si is 0.05 to 0.25% by weight, preferably 0.05 to 0.20% by weight. By blending Si, it mainly reacts with Mg to precipitate Mg 2 Si, thereby increasing the strength of the core material. Therefore, when the amount of Si is less than 0.05% by weight, a desired strength cannot be obtained. Further, there arises a problem that workability in which the amount of Si exceeds 0.25% by weight is lowered and corrosion resistance is also lowered.
Ｃｕは、０．３重量％以下とし、好ましくは０．２５重量％以下とする。Ｃｕの配合により、特に強度を高めることができる。従って、Ｃｕ量が０．３重量％を超えると耐食性が低下する。 Cu is 0.3% by weight or less, preferably 0.25% by weight or less. By adding Cu, the strength can be particularly increased. Therefore, when the amount of Cu exceeds 0.3% by weight, the corrosion resistance decreases.
Ｍｎは、０．０４〜０．１重量％とし、好ましくは０．０４〜０．９５重量％とする。Ｍｎの配合により、特に芯材の強度を高めることができる。従って、Ｍｎ量が０．０４重量％未満の場合は、所望の強度を得ることができない。また、Ｍｎ量が０．１重量％を超えると加工性（圧延性）が低下する。 Mn is 0.04 to 0.1% by weight, preferably 0.04 to 0.95% by weight. In particular, the strength of the core material can be increased by blending Mn. Therefore, when the amount of Mn is less than 0.04% by weight, the desired strength cannot be obtained. Moreover, when the amount of Mn exceeds 0.1 weight%, workability (rollability) will fall.
Ｍｇは、２．２〜２．８重量％とし、好ましくは２．３〜２．８重量％とする。Ｍｇの配合により、特に芯材の強度を高めることができる。従って、Ｍｇ量が２．２重量％未満の場合は、所望の強度を得ることができない。また、Ｍｇ量が２．８重量％を超えると加工性（圧延性）が低下する。 Mg is 2.2 to 2.8% by weight, and preferably 2.3 to 2.8% by weight. In particular, the strength of the core material can be increased by adding Mg. Therefore, when the amount of Mg is less than 2.2% by weight, the desired strength cannot be obtained. On the other hand, when the amount of Mg exceeds 2.8% by weight, workability (rollability) decreases.
本発明の芯材は、その孔食電位が後記皮材の孔食電位よりも貴であり、かつ、前記芯材と前記皮材との孔食電池差が５０〜１１０ｍＶ（特に６０〜１１０ｍＶ）であることが望ましい。そのような構成を採用することによって、芯材の犠牲陽極効果による皮材の耐食性をより一層向上させることができる。上記の孔食電位差は、芯材及び皮材の組み合わせ等により適宜調整することができる。 In the core material of the present invention, the pitting potential of the core material is nobler than the pitting potential of the skin material described later, and the pitting cell difference between the core material and the skin material is 50 to 110 mV (particularly 60 to 110 mV). It is desirable that By adopting such a configuration, the corrosion resistance of the skin material due to the sacrificial anode effect of the core material can be further improved. The above pitting potential difference can be appropriately adjusted by a combination of a core material and a skin material.
なお、孔食電位差の測定方法は、芯材の一部を露出させた試料を電解液（０．５％ＮａＣｌ水溶液、液温２５℃）に浸漬し、ポテンションスタットを使用して電位操作法（１０ｍＶ／分）により、芯材の孔食電位を貴とし、皮材の孔食電位を卑とした場合の芯材と皮材との間での孔食電位差を測定する。 The pitting corrosion potential is measured by immersing a sample from which a part of the core material is exposed in an electrolytic solution (0.5% NaCl aqueous solution, liquid temperature 25 ° C.), and using a potentiostat. By (10 mV / min), the pitting corrosion potential difference between the core material and the skin material when the pitting corrosion potential of the core material is precious and the pitting corrosion potential of the skin material is base is measured.
芯材の厚みは特に制限されず、用途、使用方法等に応じて適宜設定することができる。一般的には５０〜１００μｍ程度、好ましくは６０〜９０μｍとすれば良い。 The thickness of the core material is not particularly limited, and can be set as appropriate depending on the application, usage method, and the like. Generally, it may be about 50 to 100 μm, preferably 60 to 90 μm.
皮材
皮材は、Ｆｅ：０．２〜０．４重量％、Ｃｕ：０．０５重量％以下及びＳｉ：０．０２〜０．１５重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金を用いる。かかる組成を採用することによって、より高い強度と耐食性とを得ることができる。このようなアルミニウム合金は、公知の純アルミニウム系合金から適宜選択して用いることもできる。
The skin material contains Fe: 0.2 to 0.4% by weight, Cu: 0.05% by weight or less, and Si: 0.02 to 0.15% by weight, with the balance being aluminum and inevitable impurities An aluminum alloy is used. By adopting such a composition, higher strength and corrosion resistance can be obtained. Such an aluminum alloy can be appropriately selected from known pure aluminum alloys.
以下に皮材の各成分の主な役割を示す。ただし、本発明の効果は、各成分が相乗的に作用することにより得られるものであることから、必ずしも下記の役割に限定されるものではない。 The main roles of each component of the skin material are shown below. However, since the effects of the present invention are obtained by the synergistic action of each component, they are not necessarily limited to the following roles.
Ｆｅは、０．２〜０．４重量％とし、好ましくは０．２３〜０．３７重量％とする。上記範囲に設定することによって、皮材の強度をより高めながら優れた耐食性を得ることができる。 Fe is 0.2 to 0.4% by weight, preferably 0.23 to 0.37% by weight. By setting to the above range, excellent corrosion resistance can be obtained while further increasing the strength of the skin material.
Ｓｉは、０．０２〜０．１５重量％とし、好ましくは０．０３〜０．１３重量％とする。Ｓｉの配合により、耐食性とともに皮材の強度を高めることができる。 Si is 0.02 to 0.15% by weight, preferably 0.03 to 0.13% by weight. By compounding Si, the strength of the skin material can be increased along with the corrosion resistance.
Ｃｕは、０．０５重量％以下とし、好ましくは０．０４重量％以下とする。特に、芯材のＣｕ量と比較して皮材のＣｕ量が少なくなるように設定することが望ましい。これによって、より確実に皮材の電位を卑に維持することができ、より高い耐食性を発揮させることができる。 Cu is 0.05% by weight or less, preferably 0.04% by weight or less. In particular, it is desirable to set so that the Cu content of the skin material is smaller than the Cu content of the core material. As a result, the potential of the skin material can be more reliably maintained at a lower level, and higher corrosion resistance can be exhibited.
皮材の厚み（各１層の厚み）は特に制限されず、用途、使用方法等に応じて適宜設定することができる。一般的には５〜３０μｍ程度、好ましくは５〜２５μｍとすれば良い。芯材の両面に形成される両皮材の厚みは、互いに同じ厚みであっても良いし、あるいは互いに異なっていても良い。 The thickness of the skin material (the thickness of each one layer) is not particularly limited, and can be appropriately set according to the application, usage method, and the like. Generally, it may be about 5 to 30 μm, preferably 5 to 25 μm. The thicknesses of both skin materials formed on both surfaces of the core material may be the same thickness or different from each other.
また、芯材の厚みに対する割合は、クラッド材の厚みを１００％とすると、芯材の厚み：皮材の厚み（２つの層の合計）＝７０〜８５％：１５〜３０％程度とすれば良い。 The ratio of the thickness of the core material to the thickness of the clad material is 100% if the thickness of the core material: the thickness of the skin material (total of two layers) = 70 to 85%: about 15 to 30%. good.
クラッド材
本発明のクラッド材は、箔容器用（特に内容物に接触する面）の材料として用いることができる。例えば、しわ付き箔容器の材料として用いることができる。特に、塩分濃度０．５重量％以上、好ましくは２重量％以上、より好ましくは８重量％以上、最も好ましくは１０重量％以上の比較的高濃度の塩分を含む内容物（食品等）を収容する容器の材料として好適に用いることができる。
Clad Material The clad material of the present invention can be used as a material for a foil container (particularly the surface in contact with the contents). For example, it can be used as a material for a wrinkled foil container. In particular, it contains contents (food, etc.) containing a relatively high concentration of salt with a salt concentration of 0.5% by weight or more, preferably 2% by weight or more, more preferably 8% by weight or more, and most preferably 10% by weight or more. It can be suitably used as the material of the container to be used.
クラッド材の厚み（合計厚み）は、限定的でないが、一般的には０．１〜０．４ｍｍの範囲内で目的とする容器の種類、内容物の種類等に応じて適宜設定することができる。 Although the thickness (total thickness) of the clad material is not limited, it is generally set appropriately within the range of 0.1 to 0.4 mm according to the type of the intended container, the type of contents, and the like. it can.
本発明クラッド材を用いて容器を成形する場合は、例えばブランキング、ドローイング、ワイプダウン、カーリング等の公知の方法に従えば良い。 In the case of forming a container using the clad material of the present invention, a known method such as blanking, drawing, wiping down, curling or the like may be followed.
クラッド材の製造方法
本発明のクラッド材は、上記のような構成を備えた芯材及び皮材を用いるほかは、公知の製造方法に従って製造することができる。例えば、所定の組成に調整された原料を鋳造、面削、均質化処理等の工程を経て芯材用合金及び皮材用合金を調製した後、芯材用合金の両面に皮材用合金を積層し、圧延、焼鈍等の工程を実施することにより、所定のクラッド材を得ることができる。
Production method of clad material The clad material of the present invention can be produced according to a known production method except that the core material and the skin material having the above-described configuration are used. For example, a core material and a skin material alloy are prepared through a process such as casting, chamfering, and homogenizing a raw material adjusted to a predetermined composition, and then a skin material alloy is formed on both sides of the core material alloy. A predetermined clad material can be obtained by laminating and carrying out processes such as rolling and annealing.
以下に実施例を示し、本発明の特徴をより具体的に説明する。ただし、本発明の範囲は、実施例に限定されない。 The features of the present invention will be described more specifically with reference to examples. However, the scope of the present invention is not limited to the examples.
製造例１
表１に示す組成をもつ原料を溶解及び鋳造した後、面削及び均質化処理することにより、芯材用合金（厚み４００ｍｍ）及び皮材用合金（厚み５０ｍｍ）をそれぞれ製造した。
Production Example 1
After melting and casting the raw materials having the compositions shown in Table 1, the core material alloy (thickness 400 mm) and the skin material alloy (thickness 50 mm) were produced by chamfering and homogenization.
次いで、表２に示す芯材及び皮材の組み合わせで芯材用合金の両面に皮材用合金をそれぞれ配した。これらを熱間（５００℃）にてクラッド圧延（１パス）して厚み４ｍｍとした後、中間焼鈍（約３８０℃×５時間）及び冷間圧延（３パス）を行うことにより厚み０．０９０ｍｍ（皮材各１０％厚、芯材８０％）のクラッド箔材を作製した。 Subsequently, the alloy for skin materials was arranged on both surfaces of the alloy for core materials in the combination of the core material and the skin material shown in Table 2, respectively. These were hot-clad (500 ° C.) clad rolled (1 pass) to a thickness of 4 mm, and then subjected to intermediate annealing (about 380 ° C. × 5 hours) and cold rolling (3 passes) to a thickness of 0.090 mm. A clad foil material (10% thickness of each skin material and 80% core material) was produced.
上記クラッド箔材に対してブランキング、ドローイング、ワイプダウン及びカーリングの成形工程を複合ダイにて実施し、箔容器を作製した。 Blanking, drawing, wiping down, and curling forming steps were performed on the clad foil material with a composite die to produce a foil container.
得られた容器に醤油を含む水溶液（醤油濃度２０重量％（塩分濃度２％））を入れ、４０℃で１４日間保管した後、容器の腐食状態を観察した。腐食状態の観察においては、箔に貫通孔が開いていないものを「○」とし、貫通孔が開いたものを「×」と評価した。その結果を表２に示す。 An aqueous solution containing soy sauce (soy sauce concentration 20% by weight (salt concentration 2%)) was placed in the obtained container and stored at 40 ° C. for 14 days, and then the corrosion state of the container was observed. In the observation of the corrosion state, the case where the through hole was not opened in the foil was evaluated as “◯”, and the case where the through hole was opened was evaluated as “x”. The results are shown in Table 2.
また、作製されたアルミニウム合金クラッド材の皮材表面の一部をエメリー研磨紙により機械的に除去して芯材を露出させた後、皮材と芯材との孔食電位差を測定した。なお、電解液として０．５％ＮａＣｌ水溶液を用い、この水溶液の温度を２５℃に設定した後、前記水溶液中に上記試料を浸漬し、ポテンションスタットを使用して電位操作法（１０ｍＶ／分）により、芯材と皮材との間の孔食電位差を測定した。芯材の孔食電位を貴とし、皮材の孔食電位を卑とした場合の孔食電位差を測定した。その結果を表２に示す。 Further, a part of the skin surface of the produced aluminum alloy clad material was mechanically removed by emery polishing paper to expose the core material, and then the pitting potential difference between the skin material and the core material was measured. A 0.5% NaCl aqueous solution was used as the electrolytic solution, the temperature of this aqueous solution was set to 25 ° C., the sample was immersed in the aqueous solution, and a potential operation method (10 mV / min using a potentiostat) was used. ) To measure the pitting corrosion potential difference between the core material and the skin material. The pitting corrosion potential difference was measured when the pitting corrosion potential of the core material was precious and the pitting corrosion potential of the skin material was base. The results are shown in Table 2.
表２の結果からも明らかなように、本発明の箔容器用アルミニウム合金クラッド材は、優れた耐食性を発揮することがわかる。
As is clear from the results in Table 2, it can be seen that the aluminum alloy clad material for foil containers of the present invention exhibits excellent corrosion resistance.
Claims (3)
（１）前記芯材が、Ｆｅ：０．２〜０．４重量％、Ｓｉ：０．０５〜０．２５重量％、Ｃｕ：０．３重量％以下、Ｍｎ：０．０４〜０．１重量％及びＭｇ：２．２〜２．８重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなり、
（２）前記皮材が、Ｆｅ：０．２〜０．４重量％、Ｃｕ：０．０５重量％以下及びＳｉ：０．０２〜０．１５重量％を含有し、残部がアルミニウム及び不可避不純物であるアルミニウム合金からなる、
ことを特徴とする箔容器用アルミニウム合金クラッド材。 A clad material formed by clad a skin material on both sides of a core material and the core material,
(1) The core material is Fe: 0.2 to 0.4 wt%, Si: 0.05 to 0.25 wt%, Cu: 0.3 wt% or less, Mn: 0.04 to 0.1 Containing aluminum and Mg: 2.2 to 2.8% by weight, the balance being aluminum and inevitable impurities,
(2) The skin material contains Fe: 0.2 to 0.4 wt%, Cu: 0.05 wt% or less, and Si: 0.02 to 0.15 wt%, with the balance being aluminum and inevitable impurities Made of an aluminum alloy,
An aluminum alloy clad material for a foil container.
The aluminum alloy clad material for a foil container according to claim 1 or 2, which is used for a foil container for containing a content having a salt concentration of 0.5% by weight or more.
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| JPH10262836A (en) * | 1997-03-21 | 1998-10-06 | Mitsubishi Alum Co Ltd | Wrinkled foil container |
| JP2002019834A (en) * | 2000-07-10 | 2002-01-23 | Mitsubishi Alum Co Ltd | Cockle foil container |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10262836A (en) * | 1997-03-21 | 1998-10-06 | Mitsubishi Alum Co Ltd | Wrinkled foil container |
| JP2002019834A (en) * | 2000-07-10 | 2002-01-23 | Mitsubishi Alum Co Ltd | Cockle foil container |
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