JPH06240493A - Method for coating anodically oxidized film of aluminum - Google Patents
Method for coating anodically oxidized film of aluminumInfo
- Publication number
- JPH06240493A JPH06240493A JP3034093A JP3034093A JPH06240493A JP H06240493 A JPH06240493 A JP H06240493A JP 3034093 A JP3034093 A JP 3034093A JP 3034093 A JP3034093 A JP 3034093A JP H06240493 A JPH06240493 A JP H06240493A
- Authority
- JP
- Japan
- Prior art keywords
- film
- coating
- aluminum
- phosphoric acid
- anodic oxide
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アルミニウム又はアル
ミニウム合金の耐候性向上を、安価に且つ確実に行なう
ことができる方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving weather resistance of aluminum or aluminum alloy inexpensively and reliably.
【０００２】[0002]
【従来技術及びその問題点】アルミニウム又はアルミニ
ウム合金（以下、アルミニウム部材と称する）の耐候性
を向上させるために、塗膜を形成することは、従来から
行なわれている。ところで、アルミニウム部材に塗膜を
形成して所望の耐候性を得るためには、予めクロメート
処理などの化成皮膜処理やプライマー塗装などを行な
い、その後に塗装処理を施し、その塗膜の膜厚を例えば
３０μｍ程度の厚いものとする必要があった。そのため
には、下塗り、中塗り、上塗りといった一連の処理を何
回も繰返す必要があり、作業性が悪く、コスト高となっ
ていた。そこで、アルミニウム部材に陽極酸化皮膜を形
成して膜厚を稼ぎ、塗膜を薄くすることが行なわれてい
る。しかし、この場合には、塗膜を形成する前の乾燥工
程において、陽極酸化皮膜が封孔されたり、陽極酸化皮
膜表面が不活性となったりするために、陽極酸化皮膜と
塗膜との密着性が悪く、塗膜が剥れやすく、ひいては所
望の耐候性が得られないという問題があった。2. Description of the Related Art A coating film has been conventionally formed to improve the weather resistance of aluminum or an aluminum alloy (hereinafter referred to as an aluminum member). By the way, in order to form a coating film on an aluminum member to obtain a desired weather resistance, a conversion coating treatment such as chromate treatment or a primer coating is performed in advance, and then a coating treatment is performed to reduce the film thickness of the coating film. For example, it was necessary to make the thickness as thick as about 30 μm. For that purpose, it is necessary to repeat a series of processes such as undercoating, intermediate coating, and topcoating many times, resulting in poor workability and high cost. Therefore, an anodic oxide film is formed on the aluminum member to increase the film thickness and thin the film. However, in this case, in the drying process before forming the coating film, the anodized film is sealed or the surface of the anodized film becomes inactive. However, there is a problem that the coating film is poor in peeling property and the desired weather resistance cannot be obtained.
【０００３】[0003]
【発明の目的】本発明は、アルミニウム又はアルミニウ
ム合金の耐候性向上を、安価に且つ確実に行なうことが
できる方法を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method capable of improving weather resistance of aluminum or aluminum alloy inexpensively and reliably.
【０００４】[0004]
【目的を達成するための手段】本発明は、アルミニウム
又はアルミニウム合金に陽極酸化皮膜を形成し、この陽
極酸化皮膜を、リン酸を主成分とする浴中にて浸漬処理
又は電解処理し、その後、その陽極酸化皮膜上に、塗料
を吹付又は浸漬により塗装することを特徴とするアルミ
ニウム陽極酸化皮膜の塗装方法である。The present invention comprises forming an anodic oxide film on aluminum or an aluminum alloy, subjecting the anodic oxide film to a dipping or electrolytic treatment in a bath containing phosphoric acid as a main component, and thereafter. A coating method of an aluminum anodic oxide film, characterized in that a paint is applied onto the anodic oxide film by spraying or dipping.
【０００５】陽極酸化皮膜は、硫酸、シュウ酸などを用
いて、常法の陽極酸化処理により形成する。皮膜厚さ
は、３μｍ以上であればよいが、本発明の目的から考え
ると、１０〜２０μｍが好ましい。なお、形成した陽極
酸化皮膜に対しては、電解着色処理を施してもよいが、
その場合の塗膜はクリヤーがよい。The anodic oxide film is formed by a conventional anodic oxidation process using sulfuric acid, oxalic acid or the like. The film thickness may be 3 μm or more, but from the viewpoint of the present invention, it is preferably 10 to 20 μm. The formed anodized film may be subjected to electrolytic coloring treatment,
In that case, the coating film should be clear.
【０００６】[0006]
【作用】陽極酸化皮膜を、リン酸を主成分とする浴中に
て浸漬処理又は電解処理すると、陽極酸化皮膜の孔壁を
含む表面には、ＰＯ4 3-が結合して存在することとな
り、Ａｌ2Ｏ3の水和反応が抑制されるので、陽極酸化皮
膜が封孔されたり、陽極酸化皮膜表面が不活性となった
りすることはない。なお、ＰＯ4 3-は以下の理由により
存在することとなる。[Function] When the anodic oxide film is soaked or electrolyzed in a bath containing phosphoric acid as a main component, PO 4 3- is present on the surface of the anodic oxide film including the pore walls in a bonded state. Since the hydration reaction of Al 2 O 3 is suppressed, the anodic oxide film is not sealed and the surface of the anodic oxide film is not inactive. Incidentally, PO 4 3- is will be present for the following reasons.
【０００７】即ち、上記処理中においては、例えば硫酸
を用いた陽極酸化処理で形成した陽極酸化皮膜表面に
て、浴中に含まれるＰＯ4 3-に基づいて次式(I)、(II)に
基づく反応が生じる。That is, during the above treatment, for example, on the surface of the anodized film formed by the anodizing treatment using sulfuric acid, the following formulas (I) and (II) are used based on PO 4 3- contained in the bath. A reaction based on
【化１】 反応(I) 、(II)の平衡定数は、(I) ＞(II)であるので、
上記陽極酸化処理で生成したＡｌ2（ＳＯ4）3は解離
し、ＳＯ4 2-が溶液中に溶出し、Ａｌ3+はＰＯ4 3-と結合
して陽極酸化皮膜の表面にはリン酸を含有したＡｌＰＯ
4からなる壁が生成する。また、その壁面には、浴中に
過剰に存在しているＰＯ4 3-が陽性に帯電している陽極
酸化皮膜に引き付けられて結合する。[Chemical 1] Since the equilibrium constants of reactions (I) and (II) are (I)> (II),
Al 2 (SO 4 ) 3 generated by the anodizing treatment is dissociated, SO 4 2− is eluted into the solution, Al 3+ is combined with PO 4 3−, and phosphoric acid is formed on the surface of the anodized film. Containing AlPO
A wall of 4 is generated. In addition, PO 4 3− existing in excess in the bath is attracted to and bonded to the wall surface of the positively charged anodic oxide film.
【０００８】[0008]
（実施例１）純アルミニウムを用い、１７％硫酸浴中に
て、１．５Ａ／ｄｍ2を２５分間印加する条件で陽極酸
化処理を行ない、厚さ１２μｍの陽極酸化皮膜を得た。
この陽極酸化皮膜を、２５℃、１００ｇ／ｌリン酸浴中
にて、ＡＣ１０Ｖを３分間印加する条件で電解処理し
た。そして、乾燥した後、陽極酸化皮膜上に、白色の塗
料である商品名「ベルタイトＮｏ．５０００」（日本油
脂株式会社製）をスプレー塗装し、常温で乾燥して、厚
さ１５μｍの塗膜を形成した。(Example 1) Using pure aluminum, anodization treatment was performed in a 17% sulfuric acid bath under the condition of applying 1.5 A / dm 2 for 25 minutes to obtain an anodized film having a thickness of 12 μm.
This anodized film was subjected to electrolytic treatment in a 100 g / l phosphoric acid bath at 25 ° C. under the condition of applying AC 10 V for 3 minutes. Then, after drying, a white paint, "Bertite No. 5000" (manufactured by NOF CORPORATION), is spray-coated on the anodized film and dried at room temperature to form a coating film having a thickness of 15 μm. Formed.
【０００９】（実施例２）アルミニウム合金（Ａ１１０
１Ｐ−Ｈ２４）を用い、３％シュウ酸浴中にて、交直重
畳法により、ＡＣ１Ａ／ｄｍ2、ＤＣ１Ａ／ｄｍ2を３０
分間印加する条件で陽極酸化処理を行ない、厚さ１０μ
ｍの黄金色の陽極酸化皮膜を得た。この陽極酸化皮膜
を、５０ｇ／ｌリン酸及び２０ｇ／ｌ硫酸からなる２０
℃の浴に１０分間浸漬した。そして、乾燥した後、陽極
酸化皮膜上に、商品名「レタンＰＡＱクリヤー」（関西
ペイント株式会社製）の塗料を用いて浸漬塗装を施し
た。浸漬塗装は、塗料温度２０℃、引き上げ速度１ｍ／
ｍｉｎの条件で行なった。その後、１２０℃、２０分間
の条件で焼付処理し、厚さ１５〜２０μｍの塗膜を形成
した。(Example 2) Aluminum alloy (A110
1P-H24) in a 3% oxalic acid bath, AC1A / dm 2 and DC1A / dm 2 at 30% by AC / DC superimposition method.
Anodizing treatment is performed under the condition of applying voltage for 10 minutes
m of a golden anodized film was obtained. This anodic oxide film is made up of 50 g / l phosphoric acid and 20 g / l sulfuric acid.
It was immersed in a bath at ℃ for 10 minutes. Then, after drying, dip coating was applied on the anodized film using a paint of trade name "Retan PAQ Clear" (manufactured by Kansai Paint Co., Ltd.). For immersion coating, the coating temperature is 20 ° C and the pulling speed is 1m /
It was performed under the condition of min. After that, baking treatment was performed at 120 ° C. for 20 minutes to form a coating film having a thickness of 15 to 20 μm.
【００１０】（実施例３）アルミニウム合金（Ａ６０６
３Ｓ−Ｔ５）を用い、１７％硫酸浴中にて、１．２Ａ／
ｄｍ2を５０分間印加する条件で陽極酸化処理を行な
い、厚さ１６μｍの陽極酸化皮膜を得た。この陽極酸化
皮膜を、２５℃、１００ｇ／ｌリン酸浴中にて、ＡＣ１
５Ｖを３分間印加する条件で電解処理し、更に、５０ｇ
／ｌ硫酸アルミニウム及び１００ｇ／ｌ硫酸ニッケルか
らなる２０℃の浴中にて、ＡＣ２５Ｖを３分間印加する
条件で電解着色処理した。陽極酸化皮膜は青灰色となっ
た。そして、陽極酸化皮膜上に、商品名「ベルタイトＮ
ｏ．５０００クリヤー」（日本油脂株式会社製）の塗料
をスプレー塗装し、常温で乾燥して、厚さ２０μｍの塗
膜を形成した。(Example 3) Aluminum alloy (A606
3S-T5) in a 17% sulfuric acid bath at 1.2 A /
Anodization treatment was performed under the condition that dm 2 was applied for 50 minutes to obtain an anodized film having a thickness of 16 μm. This anodic oxide film was treated with AC1 at 25 ° C. in a 100 g / l phosphoric acid bath.
Electrolyte under the condition that 5V is applied for 3 minutes, and further 50g
Electrolytic coloring treatment was performed in a bath of 20 ° C. composed of 1 / l aluminum sulfate and 100 g / l nickel sulfate under the condition of applying AC25V for 3 minutes. The anodized film turned blue gray. Then, on the anodized film, the product name "Bertite N
o. A paint of "5000 clear" (manufactured by NOF CORPORATION) was spray-coated and dried at room temperature to form a coating film having a thickness of 20 µm.
【００１１】（比較例）アルミニウム合金（Ａ６０６３
Ｓ−Ｔ５）を用い、１７％硫酸浴中にて、１．５Ａ／ｄ
ｍ2を２５分間印加する条件で陽極酸化処理を行ない、
厚さ１２μｍの陽極酸化皮膜を得た。この陽極酸化皮膜
上に、商品名「エピコＮｏ．７０００プライマー」（日
本油脂株式会社製）のプライマーを塗布した後、白色の
塗料である商品名「ベルタイトＮｏ．５０００」（日本
油脂株式会社製）をスプレー塗装し、常温で乾燥して、
厚さ１０μｍのプライマー層と厚さ２０μｍの塗膜を形
成した。(Comparative Example) Aluminum alloy (A6063)
S-T5) in a 17% sulfuric acid bath at 1.5 A / d
anodizing under the condition that m 2 is applied for 25 minutes,
An anodized film having a thickness of 12 μm was obtained. After applying a primer of trade name "Epico No. 7000 Primer" (manufactured by NOF CORPORATION) on this anodized film, a product name "Bertite No. 5000" (manufactured by NOF CORPORATION), which is a white paint. Spray paint, dry at room temperature,
A primer layer having a thickness of 10 μm and a coating film having a thickness of 20 μm were formed.
【００１２】実施例１〜３及び比較例で得られた塗膜の
密着性を、沸騰水中に５時間浸漬する処理を行なう前
（１次密着）と後（２次密着）についてゴバン目試験
（ＪＩＳＨ ８６０２）を行なうことによって調べた。
実施例１〜３で得られた塗膜は、１次密着、２次密着の
いずれも、１００／１００であり、非常に密着性の良い
ものであったが、比較例で得られた塗膜は、１次密着が
９０／１００、２次密着が０／１００であり、非常に剥
れやすいものであった。Regarding the adhesiveness of the coating films obtained in Examples 1 to 3 and Comparative Example, before and after the treatment of immersing in boiling water for 5 hours (primary adhesion) and after (secondary adhesion), a crepe test ( It was investigated by carrying out JIS H 8602).
The coating films obtained in Examples 1 to 3 were 100/100 in both the primary adhesion and the secondary adhesion, and were very good in adhesion, but the coating films obtained in Comparative Examples. The primary adhesion was 90/100 and the secondary adhesion was 0/100, which was very easy to peel off.
【００１３】[0013]
【発明の効果】以上のように本発明のアルミニウム陽極
酸化皮膜の塗装方法によれば、アルミニウム又はアルミ
ニウム合金に陽極酸化皮膜を形成し、この陽極酸化皮膜
を、リン酸を主成分とする浴中にて浸漬処理又は電解処
理し、その後、その陽極酸化皮膜上に、塗料を吹付又は
浸漬により塗装するので、次のような効果を奏する。As described above, according to the method for coating an aluminum anodic oxide film of the present invention, an anodic oxide film is formed on aluminum or an aluminum alloy, and this anodic oxide film is used in a bath containing phosphoric acid as a main component. Then, the coating is sprayed or dipped onto the anodized film, so that the following effects can be obtained.
【００１４】（１）陽極酸化皮膜を形成するので、陽極
酸化皮膜により膜厚を稼ぐことによって塗膜を薄くでき
る。従って、塗装処理の作業性を向上でき、コストを安
価にできる。(1) Since the anodic oxide film is formed, the coating film can be thinned by increasing the film thickness by the anodic oxide film. Therefore, the workability of the coating process can be improved and the cost can be reduced.
【００１５】（２）リン酸を主成分とする浴中にて浸漬
処理又は電解処理するので、陽極酸化皮膜の表面にＰＯ
4 3-を存在させ、これによって、陽極酸化皮膜が封孔さ
れたり、陽極酸化皮膜表面が不活性となったりするのを
防止できる。このため、続く塗装により陽極酸化皮膜上
に形成された塗膜と陽極酸化皮膜との密着性を向上で
き、塗膜が剥れるのを防止できる。従って、アルミニウ
ム又はアルミニウム合金に所望の耐候性を与えることが
できる。(2) Since immersion treatment or electrolytic treatment is carried out in a bath containing phosphoric acid as a main component, the surface of the anodized film is PO
4 3 in the presence of, thereby, or is anodized film sealing, that the anodized film surface may become inactive can be prevented. Therefore, the adhesion between the anodized film and the coating film formed on the anodized film by the subsequent coating can be improved, and the film can be prevented from peeling off. Therefore, desired weather resistance can be given to aluminum or an aluminum alloy.
Claims (1)
極酸化皮膜を形成し、この陽極酸化皮膜を、リン酸を主
成分とする浴中にて浸漬処理又は電解処理し、その後、
その陽極酸化皮膜上に、塗料を吹付又は浸漬により塗装
することを特徴とするアルミニウム陽極酸化皮膜の塗装
方法。1. An anodized film is formed on aluminum or an aluminum alloy, and the anodized film is immersed or electrolyzed in a bath containing phosphoric acid as a main component, and thereafter,
A method for coating an aluminum anodic oxide film, which comprises coating the paint by spraying or dipping on the anodic oxide film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3034093A JPH06240493A (en) | 1993-02-19 | 1993-02-19 | Method for coating anodically oxidized film of aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3034093A JPH06240493A (en) | 1993-02-19 | 1993-02-19 | Method for coating anodically oxidized film of aluminum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06240493A true JPH06240493A (en) | 1994-08-30 |
Family
ID=12301104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3034093A Pending JPH06240493A (en) | 1993-02-19 | 1993-02-19 | Method for coating anodically oxidized film of aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06240493A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011122220A (en) * | 2009-12-11 | 2011-06-23 | Mitsubishi Alum Co Ltd | Method for manufacturing surface-treated aluminum material superior in adhesiveness |
| WO2014047607A1 (en) * | 2012-09-24 | 2014-03-27 | Alcoa Inc. | Anodized aluminum alloy products having improved appearance and/or abrasion resistance, and methods of making the same |
| CN107475764A (en) * | 2017-08-22 | 2017-12-15 | 金倍励金属（苏州）有限公司 | The surface treatment method of aluminium alloy guipure |
| WO2022108011A1 (en) * | 2020-11-19 | 2022-05-27 | 주식회사 엔더블유 | White anodizing method using nanoparticles |
-
1993
- 1993-02-19 JP JP3034093A patent/JPH06240493A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011122220A (en) * | 2009-12-11 | 2011-06-23 | Mitsubishi Alum Co Ltd | Method for manufacturing surface-treated aluminum material superior in adhesiveness |
| WO2014047607A1 (en) * | 2012-09-24 | 2014-03-27 | Alcoa Inc. | Anodized aluminum alloy products having improved appearance and/or abrasion resistance, and methods of making the same |
| CN104685110A (en) * | 2012-09-24 | 2015-06-03 | 美铝公司 | Anodized aluminum alloy products having improved appearance and/or abrasion resistance, and methods of making the same |
| CN104685110B (en) * | 2012-09-24 | 2017-12-12 | 奥科宁克有限公司 | The alloy product and its manufacture method of the anodic oxidation of outward appearance and/or wearability with improvement |
| US10087542B2 (en) | 2012-09-24 | 2018-10-02 | Arconic Inc. | Anodized aluminum alloy products having improved appearance and/or abrasion resistance, and methods of making the same |
| CN107475764A (en) * | 2017-08-22 | 2017-12-15 | 金倍励金属（苏州）有限公司 | The surface treatment method of aluminium alloy guipure |
| WO2022108011A1 (en) * | 2020-11-19 | 2022-05-27 | 주식회사 엔더블유 | White anodizing method using nanoparticles |
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