JPS6234825B2 - - Google Patents
Info
- Publication number
- JPS6234825B2 JPS6234825B2 JP59105963A JP10596384A JPS6234825B2 JP S6234825 B2 JPS6234825 B2 JP S6234825B2 JP 59105963 A JP59105963 A JP 59105963A JP 10596384 A JP10596384 A JP 10596384A JP S6234825 B2 JPS6234825 B2 JP S6234825B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum alloy
- aluminum
- food containers
- pitting resistance
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000838 Al alloy Inorganic materials 0.000 claims description 31
- 235000013305 food Nutrition 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000000956 alloy Substances 0.000 description 5
- 235000013361 beverage Nutrition 0.000 description 5
- 239000000523 sample Substances 0.000 description 4
- 239000005028 tinplate Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000012611 container material Substances 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000005029 tin-free steel Substances 0.000 description 1
Landscapes
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Description
［産業上の利用分野］
本発明は食品容器用アルミニウム合金に関し、
さらに詳しくは、腐蝕性の激しい内容物に対して
耐孔蝕性に優れた飲料や食品の容器用アルミニウ
ム合金に関する。
［従来技術］
一般的に、アルミニウム或いはアルミニウム合
金は、表面に保護力の強い酸化皮膜を形成し、実
用上優れた耐蝕性を示すために、日用品や建材等
の分野に幅広く使用されている。
また、アルミニウム或いはアルミニウム合金
は、耐蝕性が優れている外に、軽量で、かつ、成
形性に優れ、さらには、その腐蝕生成物は無害で
あるという特色を有しており、近年になつて、ビ
ール、炭酸飲料、果汁等の清涼飲料や缶詰等の食
品容器の素材としても有用性が認められ、その使
用量は年々増加する傾向にある。
そして、この種飲料食品用素材としては、
JIS5052に代表されるAl―Mg合金、JIS3004等の
Al―Mg―Mn合金、または、特に深絞り性が要求
されるキヤツプ材には純アルミニウム系合金が一
般的に使用され、通常は塗装してから実用に供さ
れる。
しかして、この種飲料食品用のアルミニウム合
金は、成形性に優れ、耐蝕性も比較的良好である
が、内容物中のClイオンが数百ppmと多い場合
等腐蝕性の激しい内容物の場合においては、アル
ミニウム合金の保護酸化皮膜は容易に破壊され、
局部的な溶解が生じて孔蝕となり、容器として致
命的な事故につながる可能性があるので、その用
途は自から制限される。
また、蓋材としてアルミニウム或いはアルミニ
ウム合金を使用し、胴体はブリキ、TFS、スチ
ール等アルミニウム或いはアルミニウム合金より
電気化学的に貴な材料を用いる場合には、内容物
自体の腐蝕作用の他にガルバニツク作用が付加さ
れるため、アルミニウム或いはアルミニウム合金
の材料に発生する孔蝕の進行速度は増大されると
ころとなり、内容物によるアルミニウム或いはア
ルミニウム合金の材料の用途制限はさらに厳しく
なる。
［発明が解決しようとする問題点］
本発明者は上記に説明したように、アルミニウ
ム或いはアルミニウム合金は優れた特性を有して
おりながら、飲料食品容器用素材として用途が制
限されていることに鑑み、鋭意研究の結果優れた
耐孔蝕性を有する食品容器用アルミニウム合金を
開発した。
［問題点を解決するための手段］
本発明に係る耐孔蝕性に優れた食品容器用アル
ミニウム合金は、
(1) Cu0.2〜0.8wt％、Mn0.5〜1.5wt％、
を含有し、残部Alおよび不可避不純物からな
ることを特徴とする耐孔蝕性に優れた食品容器
用アルミニウム合金を第１の発明とし、
(2) Cu0.2〜0.8wt％、Mn0.5〜1.5wt％、Cr0.05
〜0.35wt％
を含有し、残部Alおよび不可避不純物からな
ることを特徴とする耐孔蝕性に優れた食品容器
用アルミニウム合金を第２の発明とする２つの
発明よりなるものである。
本発明に係る耐孔蝕性に優れた食品容器用アル
ミニウム合金について以下詳細に説明する。
先ず、本発明に係る耐孔蝕性に優れた食品容器
用アルミニウム合金の含有成分および成分割合に
ついて説明する。
Cuはアルミニウム合金を電気化学的に貴とす
る効果があり、含有量が0.2wt％未満ではこの効
果は小さく、また、0.8wt％を越えて含有される
と粒界腐蝕感受性が増大するので好ましくない。
よつて、Cu含有量は0.2〜0.8wt％とする。
Mnはアルミニウム合金を電気化学的に貴と
し、さらに耐蝕性を向上させると共に強度を高め
る元素であり、炭酸飲料等のような内圧が加わる
内容物に対してはAl―Mg合金、Al―Mg―Mn合
金が容器用材料として使用され、また、魚類等の
缶詰等については充填後、100℃以上の高温で殺
菌する際に容器内の圧力が上昇するので、容器部
材としてはある程度の強度が必要であり、Mn含
有量が0.5wt％未満では所望の効果が得られず、
また、1.5wt％を越える多量の含有は粗大な金属
間化合物を生成し、厳しい成形において逆に欠陥
の原因となる。よつて、Mn含有量は0.5〜1.5wt
％とする。
Crはアルミニウム合金の強度を高めると共に
電気化学的により貴とし、さらに、耐蝕性を向上
させる元素であり、含有量が0.05wt％未満ではこ
の効果は認められず、また、0.35wt％を越える含
有量では効果が飽和してしまい無駄であり、Mn
と同様に多量に含有されると金属間化合物を生成
して好ましいない。よつて、Cr含有量は0.05〜
0.35wt％とする。
これらの含有成分以外に、Ti等の鋳造組織を
微細化する元素を含有させることが可能である。
なお、Feは不可避不純物として含有されるこ
とがあり、含有量は0.3wt％程度までは本発明に
係る耐孔蝕性に優れた食品容器用アルミニウム合
金の所期の目的を阻害することがないので許容さ
れるが、少ない程望ましい元素である。
［実施例］
次に、本発明に係る耐孔蝕性に優れた食品容器
用アルミニウム合金の実施例を説明する。
実施例
第１表に示す含有成分および成分割合のアルミ
ニウム合金を常法に従つて溶解鋳造し、この鋳塊
を圧延により3.5mmの厚さのホツトコイルを作製
し、その後、冷間圧延により0.3mm厚さに仕上げ
て供試材とした。
本発明に係る耐孔蝕性に優れた食品容器用アル
ミニウム合金はNo.１〜No.５であり、比較材はNo.６
〜No.10である。
この供試材のNo.１〜No.５とNo.６〜No.10について
耐孔蝕性の試験を行なつた。
即ち、第１図に示すように、塩化ビニルパイプ
３の一端に電気化学的に貴であるブリキ２を固定
し、他端に供試材１を固定し、そして、ブリキ２
と供試材１のアルミニウム合金の組合せで使用す
る場合を想定し、この両者を導線４で連結し、ま
た、腐蝕媒体５としては高塩素含有飲料のモデル
として食塩でClイオンを800ppmに調整し、クエ
ン酸およびクエン酸ソーダによりPHを３に調整
したものを使用し、次いで、38℃の温度に保持し
て24時間経過後の各試料の孔蝕発生状況を評価し
た。
この結果を第２表に示すが、この第２表から明
らかなように、本発明に係る耐孔蝕性に優れた食
品容器用アルミニウム合金は耐孔蝕性に優れてい
ることがわかる。
[Industrial Application Field] The present invention relates to an aluminum alloy for food containers,
More specifically, the present invention relates to an aluminum alloy for beverage and food containers that has excellent pitting resistance against highly corrosive contents. [Prior Art] In general, aluminum or aluminum alloys form a highly protective oxide film on their surfaces and exhibit excellent corrosion resistance in practical use, and are therefore widely used in fields such as daily necessities and building materials. In addition, aluminum and aluminum alloys have the characteristics of not only excellent corrosion resistance, but also light weight and excellent formability, and furthermore, their corrosion products are harmless, and in recent years, aluminum and aluminum alloys have become popular. It is also recognized to be useful as a material for soft drinks such as beer, carbonated drinks, fruit juices, and food containers such as canned goods, and its usage tends to increase year by year. And, as this kind of material for beverages and food,
Al-Mg alloys represented by JIS5052, JIS3004, etc.
Al--Mg--Mn alloys or pure aluminum-based alloys are generally used for cap materials that require particularly deep drawability, and are usually put into practical use after being painted. Although this kind of aluminum alloy for beverages and food products has excellent formability and relatively good corrosion resistance, it is difficult to use when the content is highly corrosive, such as when the content contains as much as several hundred ppm of Cl ions. In this case, the protective oxide film of aluminum alloy is easily destroyed,
Local dissolution may occur, leading to pitting, which may lead to fatal accidents for the container, so its use is limited. In addition, when aluminum or aluminum alloy is used as the lid material and the body is made of a material that is more electrochemically noble than aluminum or aluminum alloy, such as tinplate, TFS, or steel, in addition to the corrosion of the contents themselves, galvanic action may also occur. As a result, the rate at which pitting occurs in the aluminum or aluminum alloy material increases, and the restrictions on the use of the aluminum or aluminum alloy material due to the contents become even more severe. [Problems to be Solved by the Invention] As explained above, the present inventors have discovered that although aluminum or aluminum alloy has excellent properties, its use as a material for beverage and food containers is limited. In view of this, as a result of extensive research, we have developed an aluminum alloy for food containers that has excellent pitting resistance. [Means for solving the problems] The aluminum alloy for food containers having excellent pitting resistance according to the present invention contains (1) 0.2 to 0.8 wt% of Cu and 0.5 to 1.5 wt% of Mn. The first invention is an aluminum alloy for food containers that has excellent pitting resistance and is characterized by comprising the remainder Al and unavoidable impurities, (2) Cu0.2-0.8wt%, Mn0.5-1.5wt% ,Cr0.05
The second invention is an aluminum alloy for use in food containers that has excellent pitting resistance and is characterized by containing ~0.35wt% and the remainder consisting of Al and unavoidable impurities. The aluminum alloy for food containers having excellent pitting resistance according to the present invention will be described in detail below. First, the components and component ratios of the aluminum alloy for food containers having excellent pitting resistance according to the present invention will be explained. Cu has the effect of making the aluminum alloy electrochemically noble, and if the content is less than 0.2wt%, this effect will be small, and if the content exceeds 0.8wt%, the susceptibility to intergranular corrosion will increase, so it is preferable. do not have.
Therefore, the Cu content is set to 0.2 to 0.8 wt%. Mn is an element that electrochemically enriches aluminum alloys, further improving corrosion resistance and strength. Mn alloy is used as a container material, and the pressure inside the container increases when canned fish etc. are sterilized at a high temperature of 100℃ or higher after filling, so a certain degree of strength is required for the container material. Therefore, if the Mn content is less than 0.5wt%, the desired effect cannot be obtained,
Moreover, if the content exceeds 1.5 wt%, coarse intermetallic compounds will be formed, which may cause defects in severe molding. Therefore, the Mn content is 0.5~1.5wt
%. Cr is an element that increases the strength of aluminum alloys, makes them electrochemically more noble, and also improves corrosion resistance.This effect is not observed when the content is less than 0.05wt%, and when the content exceeds 0.35wt%. It is useless to increase the amount of Mn since the effect will be saturated.
Similarly, if it is contained in a large amount, intermetallic compounds will be formed, which is not desirable. Therefore, the Cr content is 0.05~
The content shall be 0.35wt%. In addition to these components, it is possible to contain elements such as Ti that refine the cast structure. Note that Fe may be contained as an unavoidable impurity, and the content up to about 0.3 wt% will not impede the intended purpose of the aluminum alloy for food containers with excellent pitting resistance according to the present invention. Therefore, it is permissible, but the smaller the element, the more desirable it is. [Example] Next, an example of an aluminum alloy for food containers having excellent pitting resistance according to the present invention will be described. Example An aluminum alloy having the components and proportions shown in Table 1 was melted and cast according to a conventional method, and this ingot was rolled to produce a hot coil with a thickness of 3.5 mm, and then cold-rolled to a thickness of 0.3 mm. It was finished to a certain thickness and used as a test material. The aluminum alloys for food containers with excellent pitting resistance according to the present invention are No. 1 to No. 5, and the comparative material is No. 6.
~No.10. A pitting resistance test was conducted on the sample materials No. 1 to No. 5 and No. 6 to No. 10. That is, as shown in FIG. 1, an electrochemically noble tinplate 2 is fixed to one end of a vinyl chloride pipe 3, a test material 1 is fixed to the other end, and the tinplate 2 is fixed to the other end.
Assuming that a combination of aluminum alloy and sample material 1 will be used, the two will be connected with a conductor 4, and as a corrosive medium 5, the Cl ions will be adjusted to 800 ppm using table salt as a model for a high chlorine-containing beverage. The pH of each sample was adjusted to 3 with citric acid and sodium citrate, and then the pitting occurrence of each sample was evaluated after 24 hours at a temperature of 38°C. The results are shown in Table 2. As is clear from Table 2, the aluminum alloy for food containers having excellent pitting resistance according to the present invention has excellent pitting resistance.
【表】【table】
【表】
［発明の効果］
以上説明したように、本発明に係る食品容器用
アルミニウム合金は上記に説明した通りの構成を
有しているものであるから、耐孔蝕性に優れ、特
にアルミニウム合金より電気的に貴な材料の、例
えば、ブリキ等と組合せて使用する場合に極めて
有効であり、食品容器用素材、即ち、蓋材或いは
胴材として使用する際に板厚を薄くすることがで
きる等工業的に優れた効果を有するものである。[Table] [Effects of the Invention] As explained above, since the aluminum alloy for food containers according to the present invention has the structure as explained above, it has excellent pitting resistance, and is particularly suitable for aluminum alloys. It is extremely effective when used in combination with materials that are electrically more noble than alloys, such as tinplate, and can be made thinner when used as a food container material, such as a lid or body material. It has excellent industrial effects such as:
第１図は腐蝕試験方法を示すための概略断面図
である。
１……供試材、２……電気化学的に貴な材料、
３……塩化ビニルパイプ、４……導線、５……腐
蝕媒体。
FIG. 1 is a schematic cross-sectional view showing the corrosion test method. 1... Test material, 2... Electrochemically noble material,
3... Vinyl chloride pipe, 4... Conductive wire, 5... Corrosive medium.
Claims (1)
ことを特徴とする耐孔蝕性に優れた食品容器用ア
ルミニウム合金。 ２ Cu0.2〜0.8wt％、Mn0.5〜1.5wt％、Cr0.05
〜0.35wt％ を含有し、残部Alおよび不可避不純物からなる
ことを特徴とする耐孔蝕性に優れた食品容器用ア
ルミニウム合金。[Claims] 1. An aluminum alloy for food containers with excellent pitting resistance, characterized by containing 0.2 to 0.8 wt% of Cu and 0.5 to 1.5 wt% of Mn, with the remainder consisting of Al and unavoidable impurities. . 2 Cu0.2-0.8wt%, Mn0.5-1.5wt%, Cr0.05
An aluminum alloy for food containers with excellent pitting resistance, characterized by containing ~0.35wt% and the remainder consisting of Al and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10596384A JPS60251242A (en) | 1984-05-25 | 1984-05-25 | Aluminum alloy for food container superior in pitting corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10596384A JPS60251242A (en) | 1984-05-25 | 1984-05-25 | Aluminum alloy for food container superior in pitting corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60251242A JPS60251242A (en) | 1985-12-11 |
| JPS6234825B2 true JPS6234825B2 (en) | 1987-07-29 |
Family
ID=14421445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10596384A Granted JPS60251242A (en) | 1984-05-25 | 1984-05-25 | Aluminum alloy for food container superior in pitting corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60251242A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61194144A (en) * | 1984-10-23 | 1986-08-28 | Furukawa Alum Co Ltd | Pitting resistance aluminum alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB913774A (en) * | 1959-04-13 | 1962-12-28 | Aluminum Co Of America | Duplex aluminous metal corrosion-resistant members |
| JPS528388A (en) * | 1975-06-30 | 1977-01-22 | Aluminum Co Of America | Improved container having aluminum panel with tear |
| JPS5974284A (en) * | 1982-10-19 | 1984-04-26 | Furukawa Alum Co Ltd | Brazing sheet for aluminum heat exchanger |
-
1984
- 1984-05-25 JP JP10596384A patent/JPS60251242A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB913774A (en) * | 1959-04-13 | 1962-12-28 | Aluminum Co Of America | Duplex aluminous metal corrosion-resistant members |
| JPS528388A (en) * | 1975-06-30 | 1977-01-22 | Aluminum Co Of America | Improved container having aluminum panel with tear |
| JPS5974284A (en) * | 1982-10-19 | 1984-04-26 | Furukawa Alum Co Ltd | Brazing sheet for aluminum heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60251242A (en) | 1985-12-11 |
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