JPH03146634A - Aluminum base material for coating or the like having excellent corrosion resistance under paint film - Google Patents
Aluminum base material for coating or the like having excellent corrosion resistance under paint filmInfo
- Publication number
- JPH03146634A JPH03146634A JP28595089A JP28595089A JPH03146634A JP H03146634 A JPH03146634 A JP H03146634A JP 28595089 A JP28595089 A JP 28595089A JP 28595089 A JP28595089 A JP 28595089A JP H03146634 A JPH03146634 A JP H03146634A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- coating
- film
- corrosion resistance
- paint film
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 38
- 238000005260 corrosion Methods 0.000 title claims abstract description 26
- 230000007797 corrosion Effects 0.000 title claims abstract description 26
- 239000011248 coating agent Substances 0.000 title claims abstract description 19
- 238000000576 coating method Methods 0.000 title claims abstract description 19
- 239000003973 paint Substances 0.000 title claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 20
- 229910052782 aluminium Inorganic materials 0.000 title claims description 20
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 9
- 238000010422 painting Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005530 etching Methods 0.000 abstract description 4
- 235000013405 beer Nutrition 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- 239000010953 base metal Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002345 surface coating layer Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、例えばビール缶や調理済食品用容器等の飲
食品用容器、建材、電気材料あるいは工業用材料等用と
して、表面に塗膜、フィルム等の表面皮膜層を被覆形成
して使用されるような塗装等用のアルミニウム基材、特
に耐塗膜下腐蝕性に優れたアルミニウム基材に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to food and drink containers such as beer cans and cooked food containers, building materials, electrical materials, industrial materials, etc. The present invention relates to an aluminum base material for coating, etc., which is used by coating a surface film layer such as the above, and particularly to an aluminum base material having excellent under-coating corrosion resistance.
なお、この明細書において、アルミニウムの語はその合
金を含む意味において使用する。In this specification, the term aluminum is used to include its alloys.
従来の技術
例えば飲食品用容器としては、成形加工性等に優れたＡ
３００４合金等を基材とし、その表面に塗膜やフィルム
等の表面皮膜層を被覆形成したものが広く使用されてい
る。Conventional technology For example, as containers for food and beverages, A
3004 alloy as a base material, the surface of which is coated with a surface coating layer such as a paint film or film, is widely used.
発明が解決しようとする課題
ところが、このように表面に皮膜層が被覆形成されたア
ルミニウム基材はその表面皮膜層下において腐食されや
すいという難を有するものであった。However, the problem to be solved by the present invention is that the aluminum base material whose surface is coated with a film layer as described above has a problem in that the portion beneath the surface film layer is easily corroded.
上記のような欠点を解消するために、アルミニウム基材
表面に下地皮膜としてクロメート皮膜等を被覆形成する
ことによって耐食性を付与することが考えられる。しか
し、かかるクロメート皮膜の形成はクロメート処理に手
間がかかるとともに、その処理液が毒性の強いものであ
るため作業の安全性や廃液処理等の点でも問題が多いも
のであった。特に飲食品用容器として使用する場合には
内容物にクロムが溶出する危険性をも有するものであっ
た。In order to eliminate the above-mentioned drawbacks, it is conceivable to provide corrosion resistance by coating the surface of the aluminum base material with a chromate film or the like as a base film. However, the formation of such a chromate film requires time and effort for chromate treatment, and since the treatment liquid is highly toxic, there are many problems in terms of work safety and waste liquid treatment. Particularly when used as containers for food and beverages, there is a risk that chromium may be leached into the contents.
この発明は上述のような背景の下になされたものであっ
て、作業性および安全性において難を有するクロメート
皮膜を被覆形成することなく、耐塗膜下腐蝕性に優れた
塗装等用のアルミニウム基材の提供を目的とするもので
ある。This invention was made against the background as described above, and it is possible to produce aluminum for coating, etc., which has excellent under-coating corrosion resistance and does not require the formation of a chromate film, which has problems in terms of workability and safety. The purpose is to provide a base material.
課題を解決するための手段
上記目的において、発明者等は、耐塗膜下腐食性を向上
すべく種々の実験と研究を重ねた結果、Ｍｇを０．１〜
６ｖｔ％含有するアルミニウム合金からなるアルミニウ
ム基材において、特にその表面層に含有されたＭｇが塗
膜下腐食を発生させる原因となることを知見するに至り
、かかる知見に基づいてこの発明を完成し得たものであ
る。Means for Solving the Problems For the above purpose, the inventors conducted various experiments and research in order to improve the corrosion resistance under the coating film, and found that Mg was
In an aluminum base material made of an aluminum alloy containing 6vt%, it was discovered that Mg contained in the surface layer causes under-film corrosion, and based on this knowledge, the present invention was completed. That's what I got.
即ち、この発明は、Ｍｇを０．１〜６ｗｔ％含有するア
ルミニウム合金からなり、表面に塗膜やフィルム等の表
面皮膜層を被覆形成して使用される塗装等用アルミニウ
ム基材において、アルミニウム基材表面のＭｇ濃度が母
材のそれより低く規制されていることを特徴とする、耐
塗膜下腐蝕性に優れた塗装等用アルミニウム基材を要旨
とするものである。That is, the present invention provides an aluminum base material for painting, etc., which is made of an aluminum alloy containing 0.1 to 6 wt% Mg and is used by coating the surface with a surface film layer such as a paint film or film. The object of the present invention is to provide an aluminum base material for painting, etc., which has excellent corrosion resistance under a coating film, and is characterized in that the Mg concentration on the surface of the material is regulated to be lower than that of the base material.
アルミニウム基材としては、例えばジュース缶やビール
缶の場合には絞り加工性等に優れたＡ３００４合金等が
好適に用いられるが、用途に応じて要求される成形性そ
の他の諸性質を具備するものであればその組成は特に限
定されるものではない。もっとも、Ｍｇを含有しない合
金にあっては塗膜下腐蝕性がほとんど問題とならないこ
とより、この発明は少なくともＭｇを０．１〜６ｗｔ％
含有したアルミニウム合金を対象とするものである。As the aluminum base material, for example, in the case of juice cans and beer cans, A3004 alloy, etc., which has excellent drawability etc., is suitably used, but the aluminum base material has formability and other properties required depending on the purpose. If so, its composition is not particularly limited. However, since under-coating corrosion is hardly a problem with alloys that do not contain Mg, the present invention incorporates at least 0.1 to 6 wt% of Mg.
This applies to aluminum alloys containing aluminum.
このようにＭｇを含有したアルミニウム基材の表面に、
塗膜、フィルム等の表面皮膜層を被覆形成した場合、該
基材にいわゆる塗膜下腐食が発生しやすい状態となる。In this way, on the surface of the aluminum base material containing Mg,
When a surface coating layer such as a coating film or a film is formed on the substrate, so-called under-coating corrosion is likely to occur on the substrate.
その原因は必ずしも明らかではないが次のように考えら
れる。即ち、基材中にＭｇが含有されていると、そのＭ
ｇの存在により該基材表面に水和物が形成される。そし
てその水和物はポーラスであり、バリヤ性に欠けるもの
であることより、耐食性に劣るものとなる。従って、上
記アルミニウム基材表面に、塗膜、フィルム等の表面皮
膜層を被覆形成した場合、その皮膜層に水分が浸透し、
あるいは皮膜層に形成された切れ目や破れ等から水分が
侵入すると、上述のように該基材の表面、即ち皮膜層下
においてバリヤ性に劣るポーラスな水和物が形成され、
その結果、塗膜下腐食が早期に進行すると考えられる。Although the cause is not necessarily clear, it is thought to be as follows. That is, if Mg is contained in the base material, the Mg
A hydrate is formed on the surface of the substrate due to the presence of g. The hydrate is porous and lacks barrier properties, resulting in poor corrosion resistance. Therefore, when a surface film layer such as a paint film or film is formed on the surface of the aluminum base material, moisture penetrates into the film layer.
Alternatively, when moisture enters through cuts or tears formed in the film layer, porous hydrates with poor barrier properties are formed on the surface of the base material, that is, under the film layer, as described above.
As a result, it is thought that corrosion under the paint film progresses at an early stage.
このような塗膜下腐食は、特に所要の強度を付与せしめ
る目的等で焼鈍等の熱処理が施され、表面にＭｇが濃化
された場合に発生しやすいものとなる。いずれにしても
、Ｍｇが０．１〜６ｖｔ％含有するアルミニウム合金か
らなる基材においては、表面Ｍｇ濃度が母材のそれより
低く規制されていなければ、塗膜下腐蝕が発生し易い状
態となる。Such corrosion under the coating film is particularly likely to occur when heat treatment such as annealing is performed for the purpose of imparting required strength, and Mg is concentrated on the surface. In any case, in a base material made of an aluminum alloy containing 0.1 to 6 vt% Mg, if the surface Mg concentration is not regulated to be lower than that of the base material, under-film corrosion is likely to occur. Become.
従って、この発明においては、アルミニウム基材表面の
Ｍ ｇ ／ａ度を母材のそれより低く規制するものとす
る。なお、この明細書において基材表面のＭｇ濃度は厚
さ１０μｍ程度の表層部分において評価する。焼鈍等の
熱処理を施したものにあっては上述のように基材表面に
Ｍｇの濃化層が形成されるので、例えばエツチング処理
を施してその基材表面の酸化膜を除去することにより、
表面Ｍｇ濃度の調整を行うことができる。熱処理を施さ
ないものにあっても、エツチング処理を施すことによっ
て、基材表面のＭｇ濃度を好適に調整することができる
。Therefore, in this invention, the M g /a degree of the surface of the aluminum base material is regulated to be lower than that of the base material. In this specification, the Mg concentration on the surface of the substrate is evaluated in the surface layer portion having a thickness of about 10 μm. As mentioned above, a Mg concentrated layer is formed on the surface of the base material after heat treatment such as annealing, so by removing the oxide film on the surface of the base material by etching, for example,
The surface Mg concentration can be adjusted. Even if heat treatment is not performed, the Mg concentration on the surface of the base material can be suitably adjusted by performing etching treatment.
発明の効果
この発明は上述のとおり、Ｍｇを０，１〜６ｖｔ％含有
するアルミニウム合金からなる塗装等用アルミニウム基
材の表面のＭｇａ度が母材のそれより低く規制されてい
ることより、その表面に塗膜、フィルム等の表面皮膜層
を被覆形成して使用しても、塗膜下において腐蝕が生じ
ないか、極めて生じにくいものとなる。従って、表面に
クロメート皮膜を被覆形成する場合のように、手間がか
かったり、安全性や廃液処理等の点で問題か生じたりす
る不都合を回避し得、耐塗膜下腐蝕性に優れたアルミニ
ウム基材を提供することができる。特に飲食品用容器と
して使用する場合には内容物にクロムが溶出する危険性
を回避することができ、安全なものとすることができる
ばかりか、耐食性に優れた容器を提供することができる
。Effects of the Invention As mentioned above, the present invention has the advantage that the Mga degree of the surface of an aluminum base material for painting etc. made of an aluminum alloy containing 0.1 to 6 vt% Mg is regulated to be lower than that of the base material. Even when the surface is coated with a surface film layer such as a paint film or film, corrosion does not occur or is extremely unlikely to occur under the paint film. Therefore, it is possible to avoid the inconvenience of forming a chromate film on the surface, which is time-consuming and causes problems in terms of safety, waste liquid treatment, etc. A base material can be provided. In particular, when used as a container for food and drink, it is possible to avoid the risk of chromium leaching into the contents, making it not only safe, but also providing a container with excellent corrosion resistance.
実施例 次に、この発明の詳細な説明する。Example Next, the present invention will be explained in detail.
［以下余白コ
弗
表
まず、第１表に示す組成の合金からなる、厚さ０．５１
７１７ＩＩＸ幅７５＃Ｘ長さ１５０Ｍの板状アルミニウ
ム基材をそれぞれ２枚づつ準備した。[The following margins are shown below: First, the thickness is 0.51 mm, which is made of an alloy with the composition shown in Table 1.
Two plate-shaped aluminum substrates each having a width of 75# and a length of 150M were prepared.
次に、上記各基材を大気中にて４５０℃×６時間の加熱
処理を施した後、一方のグループにつき５ｖｔ％ＮａＯ
Ｈ水溶液中で深さ約１０μｍまで苛性エツチング処理を
施すことにより表面Ｍｇ４度が母材のそれより低く規制
されたものとし、他方のグループについてはそのような
処理を施さなかった。Next, each of the above substrates was heat treated in the atmosphere at 450°C for 6 hours, and then 5vt% NaO
The surface Mg4 degree was controlled to be lower than that of the base material by performing caustic etching treatment to a depth of about 10 μm in an H aqueous solution, and no such treatment was applied to the other group.
そして、これら両グループの各基材の表面に塩化ビニル
樹脂を塗布して厚さ８μｍの樹脂コーティング層を被覆
形成し、２５０℃×２０秒間の乾燥処理を施した。Then, vinyl chloride resin was applied to the surface of each base material in both groups to form a resin coating layer with a thickness of 8 μm, and a drying process was performed at 250° C. for 20 seconds.
続いて、各基材の樹脂コーティング層をナイフでクロス
状にカットし、５ｖｔ％ＣＨ３Ｃｏ。Subsequently, the resin coating layer of each base material was cut into a cross shape with a knife, and coated with 5vt% CH3Co.
Ｈ＋５ｖｔ％Ｎａｃｌ水溶液中に、室温で４０時間浸漬
した後、これを取り出し、目視で腐食の発生状態を判定
した。After being immersed in a H+5vt% NaCl aqueous solution at room temperature for 40 hours, it was taken out and the state of occurrence of corrosion was visually determined.
その結果を、腐食発生の程度に応じて下記ランクＡ−Ｄ
により第２表に示した。The results are ranked A-D according to the degree of corrosion.
It is shown in Table 2.
Ａ・・・腐食発生なし Ｂ・・・１０％以下の腐食発生あり Ｃ・・・２０％以下の腐食発生あり Ｄ・・・３０２６以下の腐食発生あり Ｅ・・・３０％を超える腐食発生あり ［以下余白コ 第 表 上記第２表の結果から明らかなように、本発 明によれば、 耐塗膜下腐蝕性に優れていること を確認し得た。A...No corrosion occurred B...10% or less corrosion occurred C...20% or less corrosion occurred D: Corrosion occurred below 3026 E: Corrosion exceeding 30% occurred [Margin below] No. table As is clear from the results in Table 2 above, this According to Ming, Excellent under-coating corrosion resistance was confirmed.
以 上Below Up
Claims (1)
なり、表面に塗膜やフィルム等の表面皮膜層を被覆形成
して使用される塗装等用アルミニウム基材において、 アルミニウム基材表面のＭｇ濃度が母材の それより低く規制されていることを特徴とする、耐塗膜
下腐蝕性に優れた塗装等用アルミニウム基材。[Scope of Claims] An aluminum base material for painting, etc., which is made of an aluminum alloy containing 0.1 to 6 wt% Mg and is used by forming a surface film layer such as a paint film or film on the surface, An aluminum base material for painting, etc., which has excellent under-coating corrosion resistance, and is characterized in that the Mg concentration on the surface of the material is regulated to be lower than that of the base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28595089A JPH03146634A (en) | 1989-10-31 | 1989-10-31 | Aluminum base material for coating or the like having excellent corrosion resistance under paint film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28595089A JPH03146634A (en) | 1989-10-31 | 1989-10-31 | Aluminum base material for coating or the like having excellent corrosion resistance under paint film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03146634A true JPH03146634A (en) | 1991-06-21 |
Family
ID=17698065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28595089A Pending JPH03146634A (en) | 1989-10-31 | 1989-10-31 | Aluminum base material for coating or the like having excellent corrosion resistance under paint film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03146634A (en) |
-
1989
- 1989-10-31 JP JP28595089A patent/JPH03146634A/en active Pending
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