JPH0889892A - Aluminum coating material and manufacturing method thereof - Google Patents
Aluminum coating material and manufacturing method thereofInfo
- Publication number
- JPH0889892A JPH0889892A JP25296094A JP25296094A JPH0889892A JP H0889892 A JPH0889892 A JP H0889892A JP 25296094 A JP25296094 A JP 25296094A JP 25296094 A JP25296094 A JP 25296094A JP H0889892 A JPH0889892 A JP H0889892A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- chemical conversion
- aluminum
- film
- treatment
- 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.)
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- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
(57)【要約】
【構成】 アルミニウムまたはアルミニウム合金の表面
に、５〜６０ｍｇ／ｍ2のＴｉ付着量となるチタン系化
成処理皮膜を設け、該皮膜上に水性塗料による塗膜を形
成してなる。化成処理皮膜形成に先立ち行われるエッチ
ング処理後、エッチング面を希酸で洗浄処理する。
【効果】 ノンクロムの化成皮膜と水性塗料による塗膜
の組み合わせにより、耐食性に優れた塗膜形成が可能と
なり、缶蓋材として有用なアルミニウム塗装材を得るこ
とができる。(57) [Summary] [Structure] A titanium chemical conversion treatment film having a Ti adhesion amount of 5 to 60 mg / m 2 is provided on the surface of aluminum or an aluminum alloy, and a coating film of an aqueous paint is formed on the film. Become. After the etching treatment performed prior to the formation of the chemical conversion coating, the etching surface is washed with dilute acid. [Effect] By combining a chromium-free chemical conversion film and a coating film of a water-based paint, a coating film having excellent corrosion resistance can be formed, and an aluminum coating material useful as a can lid material can be obtained.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アルミニウム塗装材、
とくに、耐食性に優れ、飲料缶や食缶の缶蓋材、タブ材
として好適に使用されるアルミニウム塗装材に関する。The present invention relates to an aluminum coating material,
In particular, the present invention relates to an aluminum coating material which has excellent corrosion resistance and which is suitably used as a can lid material or a tab material for beverage cans and food cans.
【０００２】[0002]
【従来の技術】アルミニウムおよびアルミニウム合金
（以下、アルミニウムという。）の板や形材などの塗装
材は、自動車、建築、包装など種々の分野において使用
されている。例えば、包装分野において、飲料缶や食缶
のイージーオープンエンドには、一般に、マグネシウム
を主要合金成分として含むアルミニウム合金板を脱脂、
エッチング処理し、リン酸クロメート処理後、塗装した
アルミニウム合金塗装板が適用されている。2. Description of the Related Art Coating materials such as aluminum and aluminum alloy (hereinafter referred to as aluminum) plates and shapes are used in various fields such as automobiles, construction and packaging. For example, in the packaging field, for the easy open end of beverage cans and food cans, aluminum alloy plates containing magnesium as a main alloying component are generally degreased,
An aluminum alloy coated plate that has been subjected to etching treatment and phosphoric acid chromate treatment and then painting is applied.
【０００３】上記缶蓋材など従来のアルミニウム塗装材
を製造する場合、塗料としては溶剤系のものが多く用い
られているが、溶剤系塗料は、臭気、排気ガスの問題か
ら塗装時の作業環境を害し、また塗料中の溶剤は乾燥時
に蒸発するため、環境問題からも溶剤を使用しない塗料
が要望され、最近では溶剤を用いない水性塗料による塗
装が自動車分野などにおいて実用化されつつある。When conventional aluminum coating materials such as the above can lid materials are manufactured, solvent-based paints are often used. However, solvent-based paints have a working environment at the time of coating due to problems of odor and exhaust gas. In addition, since the solvent in the paint evaporates during drying, there is a demand for a paint that does not use a solvent in view of environmental problems. Recently, coating with a water-based paint that does not use a solvent is being put to practical use in the automobile field and the like.
【０００４】一方、塗装の下地処理として通常実施され
てきたリン酸クロメート処理による化成皮膜の形成は、
リン酸クロメート処理剤が、６価クロムなどの有害物質
を含むため、排水処理が必要となり、排水処理により生
成する排スラッジの処理のために過大な費用を要すると
いう問題点があり、塗装の下地処理剤として、リン酸ジ
ルコニウム系あるいはリン酸チタン系の化成処理剤が検
討され、一部実用化されている。On the other hand, the formation of the chemical conversion film by the phosphoric acid chromate treatment which has been usually carried out as the base treatment for coating is
Since the phosphoric acid chromate treatment agent contains harmful substances such as hexavalent chromium, wastewater treatment is required, and there is a problem in that excessive cost is required for treatment of waste sludge generated by the wastewater treatment. As a treating agent, a zirconium phosphate-based or titanium phosphate-based chemical conversion treatment agent has been studied and partially put into practical use.
【０００５】しかしながら、リン酸ジルコニウム系やリ
ン酸チタン系の化成処理剤により形成した化成処理皮膜
上に水性塗料を塗装したものは、従来のリン酸クロメー
トによる化成皮膜上に溶剤系塗料を塗装したものに比べ
耐食性が劣り、缶蓋材のように、塗膜の密着性のみでな
く、内容物を充填し長期間保存した場合の耐食性につい
ても高度の品質が要求される塗装材として使用するには
問題がある。However, in the case where a water-based paint is applied on a chemical conversion treatment film formed of a zirconium phosphate-based or titanium phosphate-based chemical conversion treatment agent, a solvent-based paint is applied on a conventional chemical conversion film formed by phosphoric acid chromate. Corrosion resistance is inferior to that of materials, and it can be used as a coating material that requires a high quality not only for the adhesion of the coating film, but also for the corrosion resistance when the contents are filled and stored for a long time like a can lid material. Has a problem.
【０００６】発明者らは、塗装前処理剤としてリン酸チ
タン系の化成処理剤に着目し、リン酸チタン系化成処理
皮膜と水性塗料による塗膜とを組み合わせた場合におけ
る塗装後の耐食性とアルミニウム材の塗装前処理との関
連性について多角的に検討を行った結果、化成処理皮膜
中のアルミニウム材の合金成分の存在が塗装後の耐食性
に影響を与えることを見出した。The inventors focused their attention on a titanium phosphate-based chemical conversion treatment agent as a pretreatment agent for coating, and in the case of combining a titanium phosphate-based chemical conversion treatment film and a coating film of an aqueous paint, corrosion resistance after coating and aluminum. As a result of a multi-faceted study on the relationship between the pre-treatment of steel materials and coating, it was found that the presence of alloying components of aluminum materials in the chemical conversion coating film affects the corrosion resistance after coating.
【０００７】アルミニウム材を化成処理剤で処理して化
成処理皮膜を形成させる場合には、化成反応を進行させ
るために、アルミニウム材の表面に存在するＡｌ2 ０3
を主体とする強固な不働態皮膜を除去しなければなら
ず、そのために、通常、強アルカリ溶液によるエッチン
グが行われる。When an aluminum material is treated with a chemical conversion treatment agent to form a chemical conversion treatment film, Al 2 O 3 present on the surface of the aluminum material in order to promote a chemical conversion reaction.
It is necessary to remove the strong passivation film mainly composed of, and for that purpose, etching with a strong alkaline solution is usually performed.
【０００８】さらに調査検討を行った結果、エッチング
処理後のアルミニウム材の表面には合金成分が偏析して
おり、そのままリン酸チタン系の化成処理皮膜を形成さ
せた場合には、合金成分を多く含む化成処理皮膜が形成
され、その上に水性塗料による塗装を行った場合に耐食
性が劣ること、その原因として、化成処理皮膜に合金成
分が混入する以外に、合金成分の偏析が皮膜形成に影響
を与え、水性塗料による塗装下地として機能する均質な
化成処理皮膜が得難いことによるものであることが見出
され、均質なチタン系の化成処理皮膜を形成させるため
には、アルミニウム材表面の合金成分の存在量を低く抑
え、合金成分が偏在していない表面状態とすることが必
要であり、そのためにはエッチング処理後化成皮膜処理
を行う前に、表面を希酸で洗浄することが有効であるこ
とを知見した。As a result of further investigation, alloy components were segregated on the surface of the aluminum material after the etching treatment, and when the titanium phosphate chemical conversion treatment film was formed as it was, many alloy components were present. A chemical conversion treatment film containing is formed and the corrosion resistance is inferior when a water-based paint is applied on top of that, in addition to the inclusion of alloying components in the chemical conversion treatment film, segregation of alloying components affects the film formation. It has been found that it is difficult to obtain a uniform chemical conversion coating that functions as a coating base with a water-based paint, and in order to form a homogeneous titanium-based chemical conversion coating, the alloy component of the aluminum surface It is necessary to keep the amount of metal present in a low level so that the alloy component is not unevenly distributed. It was found that it is effective to washing with dilute acid.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、上記知見に
基づいて、アルミニウム材の塗装において、チタン系の
化成処理皮膜を介して水性塗料による塗膜を形成する場
合における上記従来の問題点を解消するためになされた
ものであり、その目的は、塗装後の耐食性が優れ、例え
ば飲料缶や食缶の缶蓋材として使用し、成形加工した
り、内容物を充填して長期間保存したような場合にも十
分な防食性能を有するアルミニウム塗装材およびその製
造方法を提供することを目的とする。SUMMARY OF THE INVENTION Based on the above findings, the present invention solves the above-mentioned conventional problems in forming a coating film of an aqueous coating material through a titanium-based chemical conversion coating film when coating an aluminum material. It was made to solve, the purpose is excellent in corrosion resistance after painting, for example, used as a can lid material for beverage cans and food cans, molded or stored for a long time by filling the contents An object of the present invention is to provide an aluminum coating material having sufficient anticorrosion performance even in such a case and a method for producing the same.
【００１０】[0010]
【課題を解決するための手段】上記の目的を達成するた
めの本発明によるアルミニウム塗装材は、アルミニウム
またはアルミニウム合金の表面に、５〜６０ｍｇ／ｍ2
のＴｉ付着量となるチタン系化成処理皮膜を設け、該化
成処理皮膜上に水性塗料による塗膜を形成してなること
を構成上の特徴とする。The aluminum coating material according to the present invention for achieving the above-mentioned object is 5-60 mg / m 2 on the surface of aluminum or aluminum alloy.
A structural feature is that a titanium-based chemical conversion treatment film having a Ti deposition amount of 1 is provided, and a coating film of an aqueous paint is formed on the chemical conversion treatment film.
【００１１】本発明構成上の第２の特徴は、Ｍｇを主要
合金成分として含有するＡｌ−Ｍｇ合金の表面に、５〜
６０ｍｇ／ｍ2 のＴｉ付着量となるチタン系化成処理皮
膜を設け、該化成処理皮膜上に水性塗料による塗膜を形
成してなり、缶蓋材として使用することにある。The second feature of the present invention is that the surface of the Al--Mg alloy containing Mg as a main alloy component has
A titanium-based chemical conversion treatment film having a Ti adhesion amount of 60 mg / m 2 is provided, and a coating film of an aqueous paint is formed on the chemical conversion treatment film to be used as a can lid material.
【００１２】また、本発明によるアルミニウム塗装材の
製造方法は、アルミニウムまたはアルミニウム合金の表
面を、アルカリ系脱脂剤で洗浄、エッチングしたのち、
希酸で洗浄し、５〜６０ｍｇ／ｍ2 のＴｉ付着量となる
チタン系化成処理皮膜を設け、水性塗料を塗布すること
を特徴とし、０．０５〜１０容量％の希酸を使用するこ
とを第２の特徴とする。In the method for producing an aluminum coating material according to the present invention, the surface of aluminum or aluminum alloy is washed with an alkaline degreasing agent and etched,
It is characterized in that it is washed with a dilute acid to form a titanium-based chemical conversion coating film having a Ti deposition amount of 5 to 60 mg / m 2 and is coated with a water-based paint, and 0.05 to 10% by volume of dilute acid is used. Is the second feature.
【００１３】本発明においては、アルミニウム材表面へ
の化成処理皮膜形成に先立って、アルカリ系脱脂剤によ
る脱脂洗浄、強アルカリ溶液によるエッチング処理を行
う。水洗後、希酸によりエッチング処理面を洗浄するの
が本発明における重要な特徴である。希酸としては、塩
酸、硫酸、硝酸などの希釈した酸溶液で、ｐＨ４以下の
ものが用いられる。希酸濃度は０．０５〜１０容量％の
範囲が好ましく、濃度が０．０５容量％未満では洗浄の
効果が認められず、塗膜の密着性および塗装後の耐食性
が劣る。１０容量％を越えると効果が飽和し、それ以上
の濃度のものを使用することはコスト的に不利となる。
希酸のうちではとくに硫酸が好適に使用される。In the present invention, prior to formation of the chemical conversion coating on the surface of the aluminum material, degreasing cleaning with an alkaline degreasing agent and etching treatment with a strong alkaline solution are performed. It is an important feature of the present invention that the etching treated surface is washed with dilute acid after washing with water. As the dilute acid, a diluted acid solution of hydrochloric acid, sulfuric acid, nitric acid, etc., having a pH of 4 or less is used. The dilute acid concentration is preferably in the range of 0.05 to 10% by volume, and if the concentration is less than 0.05% by volume, the effect of washing is not recognized and the adhesion of the coating film and the corrosion resistance after coating are poor. If it exceeds 10% by volume, the effect will be saturated, and it will be costly to use a higher concentration.
Of the dilute acids, sulfuric acid is particularly preferably used.
【００１４】希酸による洗浄後、水洗を行い、リン酸チ
タン系などのチタン系化成皮膜形成処理剤を使用して化
成処理皮膜を形成する。チタン系化成処理皮膜を得る方
法としては、反応型チタン系処理、塗布型チタン系処理
など各種の方法を適用することができる。形成される化
成処理皮膜中のＴｉ付着量は５〜６０ｍｇ／ｍ2 の範囲
が好ましい。Ｔｉ付着量が５ｍｇ／ｍ2 未満の化成処理
皮膜では塗膜の密着性および塗装後の耐食性が劣り、Ｔ
ｉ付着量が６０ｍｇ／ｍ2 を越える皮膜では、アルミニ
ウム材を成形加工した場合、化成処理皮膜に割れなどを
生じ耐食性が低下し易い。Ｔｉ付着量のさらに好ましい
範囲は１０〜３０ｍｇ／ｍ2 である。After washing with a dilute acid, washing with water is performed, and a chemical conversion treatment film is formed using a titanium chemical conversion film forming treatment agent such as titanium phosphate. As a method for obtaining the titanium-based chemical conversion coating, various methods such as a reactive titanium-based treatment and a coating titanium-based treatment can be applied. The Ti adhesion amount in the formed chemical conversion treatment film is preferably in the range of 5 to 60 mg / m 2 . In the case of a chemical conversion treatment film having a Ti adhesion amount of less than 5 mg / m 2 , the adhesion of the coating film and the corrosion resistance after coating are poor, and T
When the coating amount of i exceeds 60 mg / m 2 , when the aluminum material is molded, the chemical conversion coating film may be cracked and the corrosion resistance tends to decrease. A more preferable range of the amount of attached Ti is 10 to 30 mg / m 2 .
【００１５】チタン系化成処理皮膜の上に水性塗料によ
る塗膜を形成する。水性塗料としては、例えばエポキシ
−アクリル系塗料その他通常使用されている水性塗料を
適用することができ、塗装方法もロールコーティング方
式、スプレー方式、浸漬方式など通常使用されている各
種の方式を使用することができる。A coating film made of an aqueous paint is formed on the titanium-based chemical conversion treatment film. As the water-based paint, for example, an epoxy-acrylic-based paint or other commonly used water-based paint can be applied, and various commonly used methods such as a roll coating method, a spray method and a dipping method can be used as the coating method. be able to.
【００１６】本発明のアルミニウム塗装材は、とくに飲
料缶、食缶の缶蓋材として好適に使用できる。この場
合、アルミニウム材としては、一般にイージーオープン
缶蓋材として使用されている５１８２合金（Ｍｇ4.0 〜
5.0 ％、Ｍｎ0.20〜0.50％、Ｃｕ0.15％以下、Ｃｒ0.10
％以下、Ｔｉ0.10％以下、残部Ａｌおよび不可避的不純
物）など、マグネシウムを主要合金成分として含有する
Ａｌ−Ｍｇ系合金が用いられる。The aluminum coating material of the present invention can be suitably used especially as a can lid material for beverage cans and food cans. In this case, as the aluminum material, the 5182 alloy (Mg4.0 to Mg4.0-
5.0%, Mn 0.20 to 0.50%, Cu 0.15% or less, Cr 0.10
% Or less, Ti 0.10% or less, the balance Al and unavoidable impurities), and an Al-Mg based alloy containing magnesium as a main alloying component is used.
【００１７】[0017]
【作用】本発明においては、チタン系化成処理皮膜を設
け、当該皮膜上に水性塗料による塗膜を形成する場合、
チタン系化成処理皮膜形成に先立つアルミニウム材表面
の不働態皮膜除去のための強アルカリによるエッチング
ののち、エッチング処理面を希酸で洗浄することによっ
て、エッチング後のアルミニウム材表面に偏析した合金
成分を除去、低下させることにより、形成される化成処
理皮膜を均質化するとともに、化成処理皮膜への合金成
分の混入を抑制して、水性塗料による塗膜の密着性を高
め、塗装後の耐食性を優れたものとする。In the present invention, when a titanium-based chemical conversion treatment film is provided and a coating film of an aqueous paint is formed on the film,
After etching with a strong alkali to remove the passive film on the surface of the aluminum material prior to forming the titanium-based chemical conversion coating, the etching surface is washed with dilute acid to remove the alloy components segregated on the surface of the aluminum material after etching. By removing and lowering it, the chemical conversion treatment film that is formed is homogenized and the mixture of alloy components in the chemical conversion treatment film is suppressed, the adhesion of the coating film with the water-based paint is increased, and the corrosion resistance after coating is excellent. It is assumed that
【００１８】[0018]
【実施例】以下、本発明の実施例を比較例と対比して説
明する。 実施例１ アルミニウム合金板（JIS A 5182−Ｍｇ4.3 ％、Ｍｎ0.
35％、Ｃｕ0.07％、Ｔｉ0.02％、残部Ａｌおよび不可避
的不純物、板厚0.3mm)を以下に示す工程で処理した。EXAMPLES Examples of the present invention will be described below in comparison with comparative examples. Example 1 Aluminum alloy plate (JIS A 5182-Mg4.3%, Mn0.
35%, Cu0.07%, Ti0.02%, the balance Al and unavoidable impurities, and a plate thickness of 0.3 mm) were treated in the following steps.
【００１９】1.脱脂：日本ペイント株式会社製アルカリ
脱脂剤322N-8の3 重量％溶液を使用し、70℃で30秒間の
浸漬処理を行う。 2.水洗：水道水を使用し、常温で30秒間浸漬する。 3.エッチング処理：日本ペイント株式会社製アルカリエ
ッチング剤420N-2の2重量％溶液を使用し、65℃で6 秒
間の浸漬処理を行う。 4.水洗：水道水を使用し、常温で30秒間浸漬する。 5.希酸洗浄処理：表１に示す処理条件に従って浸漬処理
する。 6.水洗：水道水を使用し、常温で30秒間浸漬する。1. Degreasing: Using a 3% by weight solution of an alkaline degreasing agent 322N-8 manufactured by Nippon Paint Co., Ltd., dipping treatment is performed at 70 ° C. for 30 seconds. 2. Washing with water: Using tap water, soak for 30 seconds at room temperature. 3. Etching treatment: Using a 2% by weight solution of an alkaline etching agent 420N-2 manufactured by Nippon Paint Co., Ltd., a dipping treatment is performed at 65 ° C for 6 seconds. 4. Washing with water: Using tap water, soak for 30 seconds at room temperature. 5. Dilute acid cleaning treatment: Immersion treatment according to the treatment conditions shown in Table 1. 6. Washing with water: Using tap water, soak for 30 seconds at room temperature.
【００２０】7.化成処理：日本パーカライジング株式会
社製リン酸チタン系化成処理剤パルコートCT-K785 の10
重量％溶液およびパルコートCT-K785 の2 重量％溶液を
使用して50℃で10〜30秒間の浸漬処理、および日本ペイ
ント株式会社製リン酸チタン系化成処理剤アルサーフLX
91-304の3 容量％溶液を使用して45℃で10〜40秒間の浸
漬処理を行う。尚、Ｔｉ付着量は浸漬時間を変えて制御
した。 8.水洗：水道水を使用し、常温で30秒間浸漬する。 9.脱イオン水洗浄：脱イオン水（電導度0.2 μS/cm) を
使用し、常温で5 秒間スプレー処理を行う。 10.水切り乾燥処理：80℃で300 秒間行う。 11.塗装処理：エポキシ−アクリル系水性塗料を使用
し、塗膜重量が120mg/dm2となるように、バーコーター
で塗装した。希酸洗浄処理条件、化成処理により形成さ
れた皮膜付着量をＴｉ付着量として換算した値および塗
装後の加熱焼付け温度(PMT) を表１に示す。7. Chemical conversion treatment: 10 of Palcoat CT-K785, a titanium phosphate chemical conversion treatment agent manufactured by Nippon Parkerizing Co., Ltd.
Dipping treatment at 50 ° C for 10 to 30 seconds using a 2 wt% solution and a 2 wt% solution of Palcoat CT-K785, and the titanium phosphate chemical conversion treatment agent Alsurf LX manufactured by Nippon Paint Co., Ltd.
Immersion treatment is carried out at 45 ° C for 10 to 40 seconds using a 3% by volume solution of 91-304. The amount of Ti deposited was controlled by changing the immersion time. 8. Washing with water: Using tap water, soak for 30 seconds at room temperature. 9. Deionized water cleaning: Use deionized water (conductivity 0.2 μS / cm) for spraying at room temperature for 5 seconds. 10. Draining and drying treatment: Perform at 300 ° C for 300 seconds. 11. Coating treatment: An epoxy-acrylic water-based coating was used, and coating was performed with a bar coater so that the coating film weight was 120 mg / dm 2 . Table 1 shows the dilute acid cleaning treatment conditions, the value obtained by converting the amount of coating film formed by chemical conversion treatment as the amount of Ti deposition, and the heating and baking temperature (PMT) after coating.
【００２１】Ｔｉ付着量の測定は以下に示す方法で行っ
た。 (1) 塗膜の除去 溶剤系塗料（塩ビオルガノゾル系）：テトラヒドロフラ
ンで拭き取る。 溶剤系塗料（エポキシ系） ：濃硫酸に１分間浸
漬後水洗、乾燥。 エポキシ−アクリル系水性塗料 ：濃硫酸に１分間浸
漬後水洗、乾燥。 (2) Ｔｉ量の測定 JIS H 1359に準拠して行う。蛍光Ｘ線により測定するこ
ともできる。The Ti deposition amount was measured by the following method. (1) Removal of coating film Solvent-based paint (vinyl chloride organosol): Wipe off with tetrahydrofuran. Solvent-based paint (epoxy-based): Soak in concentrated sulfuric acid for 1 minute, wash with water and dry. Epoxy-acrylic water-based paint: Immersed in concentrated sulfuric acid for 1 minute, washed with water, and dried. (2) Measurement of Ti amount Performed in accordance with JIS H1359. It can also be measured by fluorescent X-ray.
【００２２】[0022]
【表１】 [Table 1]
【００２３】上記の工程により処理され、塗装された各
試験材について、以下の示す耐食性試験を行ったとこ
ろ、各試験材はいずれも、腐食の発生が観察されず、優
れた耐食性を示した。 耐食性試験：上記工程により塗装されたアルミニウム合
金塗装板に、鋭利なカッターで素地に達するクロスカッ
トを入れ、デュポン衝撃加工を行う。デュポン衝撃加工
におけるポンチ径は1/2 インチ、錘重量は1 kg、落下高
さは20cmとする。ついで試験材の端面をシリコーン樹脂
( 信越化学株式会社製KE-45-TS) でマスキングし、耐食
性試験液( 白ワイン) に37℃の温度で4 週間浸漬し、ク
ロスカット部および衝撃加工部の腐食状況を目視で観察
して、腐食状態を評価する。When each of the test materials treated and coated by the above steps was subjected to the following corrosion resistance test, no corrosion was observed in any of the test materials, and excellent corrosion resistance was exhibited. Corrosion resistance test: A cross cut reaching the substrate is put into the aluminum alloy coated plate coated by the above process with a sharp cutter, and DuPont impact processing is performed. In DuPont impact processing, the punch diameter is 1/2 inch, the weight weight is 1 kg, and the drop height is 20 cm. Then, attach the end surface of the test material to the silicone resin.
(Shin-Etsu Chemical Co., Ltd.KE-45-TS) masking, soaking in the corrosion resistance test liquid (white wine) at 37 ° C for 4 weeks, and visually observing the corrosion state of the cross cut part and impact processed part. , Evaluate the corrosion state.
【００２４】比較例１ 実施例１で使用したアルミニウム合金板を実施例１と同
様な工程で処理した。ただし、化成処理として、日本ペ
イント株式会社製アルサーフ401 の2 重量％溶液および
アルサーフ45の0.5 重量％溶液を使用し、45℃で20秒間
浸漬する処理を追加し、塗装処理として、塩ビオルガノ
ゾル系溶剤塗料を使用し、塗膜重量が120mg/dm2 となる
ようにバーコーターにより塗装する処理を追加して行っ
た。希酸洗浄処理条件、化成処理により形成された皮膜
付着量をＴｉ付着量またはＣｒ付着量として換算した値
および塗装後の加熱焼付け温度（PMT)を表２に示す。ま
た、塗装後の各試験材について実施例１と同一の耐食性
試験を行った結果を表１に示す、なお、表１において、
本発明の条件を外れたものには下線を付した。Comparative Example 1 The aluminum alloy plate used in Example 1 was treated in the same process as in Example 1. However, as a chemical conversion treatment, a 2 wt% solution of Alsurf 401 made by Nippon Paint Co., Ltd. and a 0.5 wt% solution of Alsurf 45 were used, and a treatment of dipping at 45 ° C for 20 seconds was added. A solvent coating was used, and a coating treatment with a bar coater was added so that the coating film weight became 120 mg / dm 2 . Table 2 shows the dilute acid cleaning treatment conditions, the values obtained by converting the amount of coating film formed by chemical conversion treatment as the amount of Ti deposition or the amount of Cr deposition, and the heating and baking temperature (PMT) after coating. In addition, Table 1 shows the results of performing the same corrosion resistance test as in Example 1 on each test material after coating.
Those outside the conditions of the present invention are underlined.
【００２５】[0025]
【表２】 《表注》塗料：水性−水性塗料 溶剤−溶剤系塗料、耐食性：○−腐食発生無し △：軽微な腐食発生 ×：衝撃加工部に激しい腐食発生[Table 2] 《Table Note》 Paint: Water-based paint Solvent-solvent paint, Corrosion resistance: ○ -No corrosion occurrence △: Minor corrosion occurrence ×: Severe corrosion occurrence in impact processed area
【００２６】試験材No.1、No.2は、希酸による洗浄工程
がないため耐食性が劣っている。試験材No.3、No4 は、
希酸洗浄処理において使用される硫酸の濃度が低いた
め、十分な耐食性を有していない。試験材No.5、No.6
は、希酸洗浄処理において使用される硫酸の濃度が高過
ぎ、経済性の点で不利である。試験材No.7、No.8は、化
成処理皮膜のＴｉ付着量が本発明の範囲未満であるた
め、十分な耐食性をそなえていない。試験材No.9は、Ｔ
ｉ付着量が本発明の限定範囲を越えているため、衝撃加
工部に腐食が生じている。試験材No.10 はリン酸クロメ
ート処理による化成皮膜が形成され、試験材No.11 はリ
ン酸クロメート処理による化成皮膜上に溶剤系塗料を塗
布したもので、現行処理材に相当し、前記のとおり排水
処理の問題や環境問題を生じる。The test materials No. 1 and No. 2 are inferior in corrosion resistance because they do not have a cleaning step with a dilute acid. Test materials No.3 and No.4 are
Since the concentration of sulfuric acid used in the dilute acid cleaning treatment is low, it does not have sufficient corrosion resistance. Test material No.5, No.6
Is disadvantageous from the economical point of view because the concentration of sulfuric acid used in the dilute acid cleaning treatment is too high. The test materials No. 7 and No. 8 do not have sufficient corrosion resistance because the Ti adhesion amount of the chemical conversion coating is less than the range of the present invention. Test material No. 9 is T
Since the adhered amount exceeds the limit range of the present invention, corrosion occurs in the impact processed part. Test material No. 10 has a chemical conversion film formed by phosphoric acid chromate treatment, and test material No. 11 is a chemical conversion film formed by phosphoric acid chromate treatment coated with a solvent-based paint. As described above, problems of wastewater treatment and environmental problems occur.
【００２７】[0027]
【発明の効果】以上のとおり、本発明によれば、有害な
クロムを含有しない化成皮膜処理剤による化成処理皮膜
形成と水性塗料による塗膜形成を組み合わせることによ
って、作業環境を改善するとともに環境汚染を防止し、
しかも耐食性に優れた塗膜の形成が可能となる。本発明
により得られるアルミニウム塗装材は、とくに飲料缶や
食缶の缶蓋材として有用である。As described above, according to the present invention, the working environment is improved and the environmental pollution is improved by combining the formation of the chemical conversion coating film by the chemical conversion film treatment agent containing no harmful chromium with the formation of the coating film by the aqueous paint. Prevent
Moreover, it becomes possible to form a coating film having excellent corrosion resistance. The aluminum coating material obtained by the present invention is particularly useful as a can lid material for beverage cans and food cans.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０５Ｄ 7/24 ３０１ Ｃ 7415−4Ｆ Ｃ２３Ｃ 22/56 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B05D 7/24 301 C 7415-4F C23C 22/56
Claims (4)
表面に、５〜６０ｍｇ／ｍ2 のＴｉ付着量となるチタン
系化成処理皮膜を設け、該化成処理皮膜上に水性塗料に
よる塗膜を形成してなることを特徴とするアルミニウム
塗装材。1. A titanium chemical conversion treatment film having a Ti deposition amount of 5 to 60 mg / m 2 is provided on the surface of aluminum or an aluminum alloy, and a coating film of an aqueous paint is formed on the chemical conversion treatment film. Aluminum coating material characterized by.
表面をアルカリ溶液で洗浄、エッチングしたのち、希酸
で洗浄し、５〜６０ｍｇ／ｍ2 のＴｉ付着量となるチタ
ン系化成処理皮膜を設け、水性塗料を塗布することを特
徴とするアルミニウム塗装材の製造方法。2. A surface of aluminum or an aluminum alloy is washed with an alkaline solution and etched, and then washed with a dilute acid to form a titanium-based chemical conversion treatment film having a Ti adhesion amount of 5 to 60 mg / m 2 , and an aqueous paint is prepared. A method for producing an aluminum coating material, which comprises applying the coating material.
る請求項２記載のアルミニウム塗装材の製造方法。3. The method for producing an aluminum coating material according to claim 2, wherein the concentration of the dilute acid is 0.05 to 10% by volume.
するＡｌ−Ｍｇ系合金の表面に、５〜６０ｍｇ／ｍ2 の
チタン系化成処理皮膜を設け、該化成処理皮膜上に水性
塗料による塗膜を形成してなり、缶蓋材として使用する
ことを特徴とするアルミニウム塗装材。4. A titanium-based chemical conversion coating of 5 to 60 mg / m 2 is provided on the surface of an Al—Mg-based alloy containing magnesium as a main alloying component, and a coating film of an aqueous paint is formed on the chemical conversion coating. The aluminum coating material characterized by being used as a can lid material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25296094A JP3625502B2 (en) | 1994-09-21 | 1994-09-21 | Method for manufacturing aluminum coating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25296094A JP3625502B2 (en) | 1994-09-21 | 1994-09-21 | Method for manufacturing aluminum coating material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0889892A true JPH0889892A (en) | 1996-04-09 |
| JP3625502B2 JP3625502B2 (en) | 2005-03-02 |
Family
ID=17244560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25296094A Expired - Fee Related JP3625502B2 (en) | 1994-09-21 | 1994-09-21 | Method for manufacturing aluminum coating material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3625502B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006126560A1 (en) * | 2005-05-27 | 2006-11-30 | Nihon Parkerizing Co., Ltd. | Chemical treating liquid for metal and treating method |
| JP2009262530A (en) * | 2008-04-28 | 2009-11-12 | Kojun Seimitsu Kogyo Kofun Yugenkoshi | Electronic device casing and manufacturing method thereof |
| CN103924744A (en) * | 2014-03-31 | 2014-07-16 | 浙江赛万特科技有限公司 | Colorized coating embossed aluminum plate |
| JPWO2021059678A1 (en) * | 2019-09-27 | 2021-04-01 |
-
1994
- 1994-09-21 JP JP25296094A patent/JP3625502B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006126560A1 (en) * | 2005-05-27 | 2006-11-30 | Nihon Parkerizing Co., Ltd. | Chemical treating liquid for metal and treating method |
| JP2009262530A (en) * | 2008-04-28 | 2009-11-12 | Kojun Seimitsu Kogyo Kofun Yugenkoshi | Electronic device casing and manufacturing method thereof |
| CN103924744A (en) * | 2014-03-31 | 2014-07-16 | 浙江赛万特科技有限公司 | Colorized coating embossed aluminum plate |
| CN103924744B (en) * | 2014-03-31 | 2016-06-22 | 浙江赛万特科技有限公司 | A kind of coloured coating embossing aluminium sheet |
| JPWO2021059678A1 (en) * | 2019-09-27 | 2021-04-01 | ||
| WO2021059678A1 (en) * | 2019-09-27 | 2021-04-01 | 本田技研工業株式会社 | Metal coating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3625502B2 (en) | 2005-03-02 |
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