JP3391252B2 - Manufacturing method of electrodeposited aluminum - Google Patents
Manufacturing method of electrodeposited aluminumInfo
- Publication number
- JP3391252B2 JP3391252B2 JP07889398A JP7889398A JP3391252B2 JP 3391252 B2 JP3391252 B2 JP 3391252B2 JP 07889398 A JP07889398 A JP 07889398A JP 7889398 A JP7889398 A JP 7889398A JP 3391252 B2 JP3391252 B2 JP 3391252B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic
- electrodeposition coating
- colored
- aluminum material
- metal
- 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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- Other Surface Treatments For Metallic Materials (AREA)
- Chemical Treatment Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、電着塗装アルミ材を製
造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electrodeposition coated aluminum material.
【０００２】[0002]
【従来の技術】陽極酸化処理したアルミニウム又はアル
ミニウム合金材（以下、アルミ材という）を金属塩含有
電解液中で電解処理すると、陽極酸化皮膜のポアに金属
又は金属塩が析出し、アルミ材が着色される。なかで
も、ｐＨ２以下の酸性浴を用いた電解着色法では、電解
液に含まれる金属イオン種に応じて種々の色調をアルミ
材に付与できる。たとえば、アルミ材をＣｕイオン含有
電解液に浸漬して交流電解すると、赤色の色調が付与さ
れる。2. Description of the Related Art When an anodized aluminum or aluminum alloy material (hereinafter referred to as an aluminum material) is electrolytically treated in a metal salt-containing electrolytic solution, a metal or a metal salt is deposited in the pores of the anodized film, and the aluminum material is Be colored. Among them, in the electrolytic coloring method using an acidic bath having a pH of 2 or less, various color tones can be imparted to the aluminum material depending on the metal ion species contained in the electrolytic solution. For example, when an aluminum material is immersed in a Cu ion-containing electrolytic solution and subjected to AC electrolysis, a red color tone is imparted.
【０００３】[0003]
【発明が解決しようとする課題】しかし、着色処理後に
電着塗装する用途では、電着塗装時に着色アルミ材が陽
極として電解処理されるため、電解着色で陽極酸化皮膜
のポアに析出した金属の溶出が生じる。金属の溶出は、
アルミ材に付けた色調を淡色化すると共に、電着塗装浴
を汚染する原因にもなる。However, in the case where the electrodeposition coating is performed after the coloring treatment, the colored aluminum material is electrolytically treated as an anode during the electrodeposition coating, so that the metal deposited on the pores of the anodized film by electrolytic coloring Elution occurs. Metal elution is
Not only does it lighten the color of the aluminum material, but it also contaminates the electrodeposition coating bath.
【０００４】[0004]
【課題を解決するための手段】本発明は、このような問
題を解消すべく案出されたものであり、電解着色で析出
した着色金属の上に更に薄い保護皮膜を析出させること
により、着色金属の溶出による電着塗料の汚染を抑制
し、良好な着色表面をもつ電着塗装アルミ材を得ること
を目的とする。本発明の製造方法は、その目的を達成す
るため、アルミニウム又はアルミニウム合金材を陽極酸
化処理し、金属塩を含むｐＨ３以下の酸性電解着色浴に
浸漬して電解着色した後、金属塩を含むｐＨ４〜８の水
溶液を用いて電解処理し、電解着色によって析出した着
色金属の上に陰極反応による薄い保護皮膜を析出させ、
その後電着塗装することを特徴とする。第２段の電解処
理では、アルミ材に通過する電気量を５〜５００クーロ
ン／ｍ2の範囲に調整することが好ましい。そして保護
皮膜の膜厚は０．０１〜０．１μｍにすることが好まし
い。電解着色後に電解処理された着色アルミ材を、陽極
としてアニオン性電着塗料液に浸漬し、電着塗装する。The present invention has been devised to solve such a problem. Coloring is achieved by depositing a thinner protective film on the colored metal deposited by electrolytic coloring. The purpose of the present invention is to suppress the contamination of the electrodeposition paint due to the elution of metal and obtain an electrodeposition coated aluminum material having a good colored surface. In order to achieve the object, the production method of the present invention is performed by anodizing an aluminum or aluminum alloy material and immersing it in an acidic electrolytic coloring bath containing a metal salt at a pH of 3 or less for electrolytic coloring, and then adding a metal salt having a pH of 4 Electrolytic treatment using an aqueous solution of ~ 8, to deposit a thin protective coating by cathode reaction on the colored metal deposited by electrolytic coloring,
After that, it is characterized by being electrodeposited. In the second-stage electrolytic treatment, it is preferable to adjust the amount of electricity passing through the aluminum material within the range of 5 to 500 coulombs / m 2 . The film thickness of the protective film is preferably 0.01 to 0.1 μm. A colored aluminum material that has been electrolytically treated after electrolytic coloring is immersed as an anode in an anionic electrodeposition coating solution and electrodeposition coated.
【０００５】[0005]
【作用】陽極酸化処理されたアルミ材の表面には、多数
のポアをもつ陽極酸化皮膜が形成されている。このアル
ミ材を金属塩を含むｐＨ３以下の酸性電解着色浴中で電
解着色すると、酸性電解着色浴に含まれる金属イオンが
金属に還元され、陽極酸化皮膜のポア底に析出する。電
解着色で付与される色調は、ポア底に析出した金属の種
類や量で定まり、析出量が多いほど濃色になる。電解着
色されたアルミ材に電着塗装を施して製品とする場合、
着色金属の表面で電着塗装時に電極反応が生じる。電極
反応は、主として析出金属を酸化する反応であり、電着
塗料液中への析出金属の溶出を促進させる。その結果、
陽極酸化皮膜中の着色金属が減少し、色調が淡色化す
る。また、着色金属の溶出により電着塗料液が汚染さ
れ、電着塗装条件や電着塗膜に悪影響を及ぼす。Function: An anodized film having a large number of pores is formed on the surface of the anodized aluminum material. When this aluminum material is electrolytically colored in an acidic electrolytic coloring bath containing a metal salt and having a pH of 3 or less, the metal ions contained in the acidic electrolytic coloring bath are reduced to metal and deposited on the pore bottom of the anodized film. The color tone imparted by electrolytic coloring is determined by the type and amount of metal deposited on the bottom of the pore, and the greater the amount of deposition, the darker the color. When applying electrolytic coating to electrolytically colored aluminum material to make a product,
Electrode reaction occurs on the surface of the colored metal during electrodeposition coating. The electrode reaction is a reaction that mainly oxidizes the deposited metal and accelerates the elution of the deposited metal into the electrodeposition coating solution. as a result,
Colored metal in the anodized film is reduced, and the color tone becomes lighter. Further, the elution of the colored metal contaminates the electrodeposition coating solution, which adversely affects the electrodeposition coating conditions and the electrodeposition coating film.
【０００６】陽極酸化皮膜のポア底に析出している着色
金属の酸化や電着塗装時の溶出は、電解着色されたアル
ミ材をｐＨ４〜８の水溶液（以下、これを中性水溶液と
いう）中で電解処理することにより抑制される。この電
解処理では、水の電解反応が進行するため、ポア中のｐ
Ｈが上昇し、中性水溶液に含まれる金属イオンが金属酸
化物や水酸化物として析出する。その結果、着色金属の
上に保護皮膜が形成される。Oxidation of the colored metal deposited on the pore bottom of the anodized film and elution during electrodeposition coating are carried out by electrolytically coloring the aluminum material in an aqueous solution having a pH of 4 to 8 (hereinafter referred to as neutral aqueous solution). It is suppressed by electrolytic treatment at. In this electrolytic treatment, the electrolytic reaction of water proceeds, so that p in the pores
H rises, and metal ions contained in the neutral aqueous solution are precipitated as metal oxides or hydroxides. As a result, a protective film is formed on the colored metal.
【０００７】中性水溶液を用いた電解処理によって陽極
酸化皮膜を着色すること自体、すでに知られている技術
である。たとえば、特開昭５４−１１６３４８号公報で
は、Ｃｕ，Ａｇ，Ａｕ等を析出させた後でＮｉ，Ｃｏ，
Ｓｎ等を析出させる２段階電解着色が開示されている。
しかし、第１段の電解着色処理は第２段の電解着色反応
を促進させるものであり、主として第２段の電解着色で
析出された金属によって所定の色調をアルミ材に付与し
ている。これに対し、本発明における中性水溶液を用い
た電解処理は、着色用ではなく、先の電解着色処理で生
成した着色金属を保護する皮膜を形成させるために施し
ている。すなわち、アルミ材に付与される色調は着色金
属で決定され、その色調を損なわない薄い保護皮膜を中
性水溶液を用いた電解処理で形成する。[0007] Coloring an anodized film by electrolytic treatment using a neutral aqueous solution is a known technique itself. For example, in Japanese Patent Laid-Open No. 54-116348, after Cu, Ag, Au, etc. are deposited, Ni, Co,
A two-step electrolytic coloring that deposits Sn and the like is disclosed.
However, the first-stage electrolytic coloring treatment promotes the second-stage electrolytic coloring reaction, and mainly imparts a predetermined color tone to the aluminum material by the metal deposited by the second-stage electrolytic coloring. On the other hand, the electrolytic treatment using the neutral aqueous solution in the present invention is not for coloring, but is performed for forming a film for protecting the colored metal produced in the above electrolytic coloring treatment. That is, the color tone imparted to the aluminum material is determined by the colored metal, and a thin protective film that does not impair the color tone is formed by electrolytic treatment using a neutral aqueous solution.
【０００８】薄い保護皮膜は、電流密度，電圧，電解時
間等を調整してアルミ材を通過する電気量を少なく、具
体的には５〜５００クーロン／ｍ2 の範囲に調整するこ
とにより形成される。保護皮膜は、着色金属に対する保
護作用を確保し、しかも着色金属による色調に悪影響を
与えないように０．０１〜０．１μｍの範囲に調整する
ことが好ましい。このようにして着色金属を保護皮膜で
覆っているので、電着塗装時に着色アルミ材を陽極とし
てアニオン性電着塗料液に浸漬し電解処理しても、保護
皮膜の表面で電極反応が生じ、着色金属の酸化や溶出が
抑えられる。したがって、着色アルミ材の淡色化や電着
塗料液の汚染が防止される。The thin protective film is formed by adjusting the current density, voltage, electrolysis time, etc. to reduce the amount of electricity passing through the aluminum material, and specifically, by adjusting it in the range of 5 to 500 coulomb / m 2. It The protective film is preferably adjusted to a range of 0.01 to 0.1 μm so as to secure a protective effect on the colored metal and not to adversely affect the color tone of the colored metal. Since the colored metal is covered with the protective film in this way, an electrode reaction occurs on the surface of the protective film even when the colored aluminum material is used as the anode during electrodeposition coating and immersed in an anionic electrodeposition coating solution for electrolytic treatment. Oxidation and elution of colored metals can be suppressed. Therefore, the lightening of the colored aluminum material and the contamination of the electrodeposition coating liquid are prevented.
【０００９】[0009]
【実施の形態】電解着色工程では、陽極酸化処理された
アルミ材を酸性電解着色浴に浸漬し、交流電解する。酸
性電解着色浴としては、Ａｇ，Ｃｕ，Ｎｉ，Ｃｏ，Ｓｎ
等の硫酸塩，スルファミン酸塩，酢酸塩，蓚酸塩やＳ
ｅ，Ｔｅ，Ｗ等のオキシ酸塩を含み、ｐＨ３以下に調整
された水溶液が使用される。各金属塩の濃度やｐＨは処
理条件や目標色調に応じて定められるが、たとえば硫酸
銅水溶液では濃度５〜２００ｇ／ｌ，ｐＨ０．５〜２に
調整される。電解には、商用交流，交直重畳，矩形波交
流等の交流が使用され、定電流法又は定電圧法の何れを
も採用できる。たとえば、硫酸銅２０ｇ／ｌ，ｐＨ１．
５の電解浴を用いて１３Ｖで定電圧電解すると、アルミ
材が淡赤色〜濃赤色に着色される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the electrolytic coloring step, an anodized aluminum material is dipped in an acidic electrolytic coloring bath and subjected to AC electrolysis. As the acidic electrolytic coloring bath, Ag, Cu, Ni, Co, Sn
Sulfate, sulfamate, acetate, oxalate and S etc.
An aqueous solution containing an oxyacid salt such as e, Te, W and adjusted to pH 3 or less is used. The concentration and pH of each metal salt are determined according to the processing conditions and the target color tone, but for example, in a copper sulfate aqueous solution, the concentration is adjusted to 5 to 200 g / l and the pH is adjusted to 0.5 to 2. For electrolysis, AC such as commercial AC, AC / DC superimposition, and rectangular wave AC is used, and either the constant current method or the constant voltage method can be adopted. For example, copper sulfate 20 g / l, pH 1.
When constant voltage electrolysis is performed at 13 V using the electrolytic bath of No. 5, the aluminum material is colored in a light red to a deep red.
【００１０】電解着色されたアルミ材は、次いで金属塩
を含む中性水溶液中で電解処理される。このときの中性
水溶液は、Ｎｉ，Ｃｏ，Ｓｎ等の硫酸塩，スルファミン
酸塩，酢酸塩等を主成分とし、ｐＨ緩衝作用や錯体形成
能をもつ硼酸，アンモニア，アミン，蓚酸，酒石酸，ク
エン酸やこれらの塩を含み、ｐＨ４〜８に調整される。
中性水溶液に含まれる各成分の濃度は処理条件に応じて
定められるが、一例を挙げると硫酸ニッケル５〜２００
ｇ／ｌ，硼酸５〜５０ｇ／ｌを含みｐＨ４〜６に調整さ
れた水溶液が使用される。この中性水溶液に着色アルミ
材を陰極として浸漬し、直流又は交流で電解処理する。
交流には、商用交流，交直重畳，矩形波交流等の交流電
源が使用される。交流電解では、電解処理効率を上げる
ため、交流のアノード成分／カソード成分の比を０．３
以下に維持することが好ましい。定電流電解又は定電圧
電解の何れをも採用可能であり、電解電圧や水溶液組成
に応じて電流密度，処理時間等の電解条件が定められ
る。The electrolytically colored aluminum material is then subjected to electrolytic treatment in a neutral aqueous solution containing a metal salt. The neutral aqueous solution at this time is mainly composed of sulfates such as Ni, Co and Sn, sulfamic acid salts, acetic acid salts, etc., and has boric acid, ammonia, amine, oxalic acid, tartaric acid, citric acid having pH buffering action and complex forming ability. It contains acids and salts thereof and is adjusted to pH 4 to 8.
The concentration of each component contained in the neutral aqueous solution is determined according to the processing conditions, but one example is nickel sulfate 5 to 200.
An aqueous solution containing g / l and boric acid of 5 to 50 g / l and adjusted to pH 4 to 6 is used. A colored aluminum material is immersed as a cathode in this neutral aqueous solution and subjected to electrolytic treatment with direct current or alternating current.
For the alternating current, an alternating current power source such as commercial alternating current, AC / DC superimposition, and rectangular wave alternating current is used. In AC electrolysis, the ratio of AC anode component / cathode component is 0.3 in order to improve electrolysis treatment efficiency.
It is preferable to keep below. Either constant current electrolysis or constant voltage electrolysis can be adopted, and electrolysis conditions such as current density and treatment time are determined according to the electrolysis voltage and the composition of the aqueous solution.
【００１１】中性水溶液を用いた電解処理は、着色アル
ミ材の色調を損なわないために、可能な限り通過電気量
を少なくし、具体的には着色アルミ材を通過する電気量
が５〜５００クーロン／ｍ2 となるように設定される。
通過電気量が多すぎると、金属の析出量が多くなりす
ぎ、厚い保護皮膜が形成されるため、酸性電解着色処理
で析出させた着色金属に由来する色調が損なわれる。逆
に、５クーロン／ｍ2 に達しない通過電気量では、着色
金属の酸化防止や電着塗装時の溶出抑制に及ぼす電解処
理の効果が弱くなる。たとえば、硫酸ニッケル１００ｇ
／ｌ，硼酸３０ｇ／ｌを含むｐＨ４．５の水溶液を用い
た電解処理では、５〜３０Ａ／ｍ2 の定電流で１〜１０
０秒間電解処理することが好ましい。In the electrolytic treatment using a neutral aqueous solution, the amount of electricity passing through the colored aluminum material is reduced as much as possible in order not to impair the color tone of the colored aluminum material. Specifically, the amount of electricity passing through the colored aluminum material is 5 to 500. It is set to be coulomb / m 2 .
If the amount of electricity passed is too large, the amount of metal deposited will be too large and a thick protective film will be formed, so that the color tone derived from the colored metal deposited by the acidic electrolytic coloring treatment will be impaired. On the other hand, when the amount of electricity passing does not reach 5 coulombs / m 2 , the effect of the electrolytic treatment on the prevention of oxidation of the colored metal and the suppression of elution during electrodeposition coating becomes weak. For example, 100g of nickel sulfate
1/10 at a constant current of 5 to 30 A / m 2 in an electrolytic treatment using an aqueous solution of pH 4.5 containing 1 / l of boric acid and 30 g / l of boric acid.
It is preferable to perform electrolytic treatment for 0 seconds.
【００１２】中性水溶液で電解処理されたアルミ材は、
水洗又は湯洗後、アニオン性電着塗料液に浸漬して電着
塗装される。アニオン性電着塗料としてはアクリル−メ
ラミン樹脂系が好ましく、必要とする光沢度に応じて艶
有り塗料，艶消し塗料等が使用される。電着塗料液は、
顔料や他の添加材を含むことができる。電着塗装には直
流電流が使用され、着色アルミ材を陽極として１〜５０
Ａ／ｍ2 の定電流又は１００〜２５０Ｖの定電圧で１０
〜３００秒電解処理される。アルミ材に電着した塗料
は、アルミ材を水洗した後、１００〜２００℃の温度で
焼付けられる。Aluminum material electrolytically treated with a neutral aqueous solution is
After being washed with water or hot water, it is immersed in an anionic electrodeposition coating solution for electrodeposition coating. As the anionic electrodeposition paint, an acrylic-melamine resin system is preferable, and a glossy paint, a matte paint or the like is used depending on the required glossiness. The electrodeposition coating liquid is
Pigments and other additives can be included. Direct current is used for electrodeposition coating, and colored aluminum material is used as an anode for 1 to 50
10 at constant current of A / m 2 or constant voltage of 100 to 250V
Electrolyzed for ~ 300 seconds. The paint electrodeposited on the aluminum material is washed with water and then baked at a temperature of 100 to 200 ° C.
【００１３】[0013]
【実施例】実施例１：６０６３アルミ押出し形材を脱
脂，アルカリエッチング，中和処理した後、１５０ｇ／
ｌ硫酸水溶液に陽極として浸漬し、電流密度１２０Ａ／
ｍ2 で２５分間陽極酸化処理し、膜厚９μｍの陽極酸化
皮膜を形成した。次いで、硫酸銅２０ｇ／ｌ，ｐＨ１．
５，温度２５℃の酸性電解着色浴に浸漬し、商用交流を
用いて１３Ｖで１分間電解着色処理した。着色処理によ
って、アルミ押出し形材は、赤色に着色された。着色処
理されたアルミ押出し形材を更に硫酸ニッケル１００ｇ
／ｌ，ｐＨ４．５，温度２５度の水溶液に浸漬し、陰極
として電流密度１０Ａ／ｍ2 で１０秒間直流電解処理し
た。電解処理されたアルミ押出し形材を水溶性アクリル
−メラミン電着塗料液に浸漬し、陽極として１５０Ｖの
直流電圧を３分間印加した。次いで、水洗し、１８０℃
で焼付け処理し、膜厚７μｍの塗膜を形成した。電解着
色でアルミ押出し形材に付与された色調は、電着塗装の
前後で実質的に変わらなかった。また、１リットルの電
着塗料液を用いて塗装面積１ｍ2 を電着塗装した後で電
着塗料液を分析したところ、Ｃｕイオン濃度が０．３ｍ
ｇ／ｌ以下と低く、Ｃｕの溶出が検出されなかった。Ｎ
ｉイオン濃度も０．３ｍｇ／ｌ以下と低く、電着塗料液
の汚染が抑制されていることが判った。Examples Example 1: 6063 Aluminum extruded profile was degreased, alkali-etched and neutralized, and then 150 g /
I. Sulfuric acid aqueous solution was immersed as an anode to obtain a current density of 120 A /
Anodizing treatment was performed at m 2 for 25 minutes to form an anodized film having a film thickness of 9 μm. Then, copper sulfate 20 g / l, pH 1.
5, immersed in an acidic electrolytic coloring bath at a temperature of 25 ° C., and electrolytically colored at 13 V for 1 minute using a commercial alternating current. The aluminum extruded profile was colored red by the coloring treatment. Colored aluminum extruded profile is added with 100 g of nickel sulfate.
It was immersed in an aqueous solution of pH / l, pH 4.5, and temperature of 25 ° C., and subjected to direct current electrolytic treatment for 10 seconds at a current density of 10 A / m 2 as a cathode. The electrolytically extruded aluminum extruded shape member was immersed in a water-soluble acrylic-melamine electrodeposition coating solution, and a DC voltage of 150 V was applied as an anode for 3 minutes. Then, wash with water, 180 ℃
The film was baked to form a coating film having a film thickness of 7 μm. The color tone imparted to the extruded aluminum profile by electrolytic coloring did not substantially change before and after the electrodeposition coating. When 1 liter of electrodeposition coating liquid was used for electrodeposition coating on a coating area of 1 m 2 and the electrodeposition coating liquid was analyzed, the Cu ion concentration was 0.3 m.
It was as low as g / l or less, and Cu elution was not detected. N
The i-ion concentration was as low as 0.3 mg / l or less, and it was found that the contamination of the electrodeposition coating liquid was suppressed.
【００１４】実施例２：酸性電解着色液として硝酸銀５
ｇ／ｌ，ｐＨ２の水溶液を使用する外は、実施例１と同
じ条件下で電着塗装押出し形材を製造した。電解着色で
アルミ押出し形材に付与された色調は、黄色みの強い赤
色であり、電着塗装後でも実質的な色調変動が観察され
なかった。この場合にも、電着塗料液にＡｇ及びＮｉの
溶出は検出されなかった。
実施例３：電解着色されたアルミ押出し形材を実施例１
と同じ硫酸ニッケル水溶液に浸漬し、アノード成分／カ
ソード成分の比率を０．２５とした交流波形を用い電流
密度２０Ａ／ｍ2 で定電流電解する外は、実施例１と同
じ条件で電着塗装押出し形材を製造した。電着塗装後の
アルミ押出し形材は、電解着色で付与された赤色の色調
を維持していた。この場合にも、電着塗料液にＣｕ及び
Ｎｉの溶出は検出されなかった。Example 2: Silver nitrate 5 as an acidic electrolytic coloring solution
An electrodeposition coating extruded profile was produced under the same conditions as in Example 1 except that an aqueous solution of g / l, pH 2 was used. The color tone imparted to the aluminum extruded profile by electrolytic coloring was a red color with a strong yellow color, and no substantial color tone variation was observed even after electrodeposition coating. Also in this case, elution of Ag and Ni was not detected in the electrodeposition coating solution. Example 3: Example 1 of electrolytically extruded aluminum extruded profile
Electrodeposition coating under the same conditions as in Example 1 except that it is immersed in the same nickel sulfate aqueous solution as in Example 1 above, and is subjected to constant current electrolysis at a current density of 20 A / m 2 using an AC waveform with an anode component / cathode component ratio of 0.25 Extruded profiles were produced. The aluminum extruded profile after electrodeposition coating maintained the red color tone imparted by electrolytic coloring. Also in this case, elution of Cu and Ni in the electrodeposition coating liquid was not detected.
【００１５】比較例１：硫酸ニッケル水溶液を用いた電
解処理を省略し、実施例１と同じ条件下でアルミ押出し
形材に電解着色及び電着塗装を施した。アルミ押出し形
材は、電解着色後には赤色の色調をもっていたが、電着
塗装後には赤味が消えていた。また、１リットルの電着
塗料液を用いて塗装面積１ｍ2 を電着塗装した後で電着
塗料液を分析したところ、濃度１００ｍｇ／ｌのＣｕイ
オンが検出され、電着塗料液が溶出Ｃｕイオンで汚染さ
れていることが判った。
比較例２：硫酸ニッケル水溶液を用いた電解処理を省略
し、実施例２と同じ条件下でアルミ押出し形材に電解着
色及び電着塗装を施した。アルミ押出し形材は、電解着
色後には黄色みのある赤色であったが、電着塗装後には
赤味が消えていた。また、１リットルの電着塗料液を用
いて塗装面積１ｍ2 を電着塗装した後で電着塗料液を分
析したところ、濃度１６０ｍｇ／ｌのＡｇイオンが検出
され、電着塗料液が溶出Ａｇイオンで汚染されているこ
とが判った。Comparative Example 1: The electrolytic treatment using an aqueous solution of nickel sulfate was omitted, and the aluminum extruded profile was subjected to electrolytic coloring and electrodeposition coating under the same conditions as in Example 1. The extruded aluminum profile had a red color tone after electrolytic coloring, but the reddish tint disappeared after electrodeposition coating. Further, when 1 liter of electrodeposition coating liquid was used for electrodeposition coating of 1 m 2 and the electrodeposition coating liquid was analyzed, Cu ions with a concentration of 100 mg / l were detected, and the electrodeposition coating liquid was eluted. It turned out to be contaminated with ions. Comparative Example 2: The electrolytic treatment using an aqueous solution of nickel sulfate was omitted, and the aluminum extruded profile was subjected to electrolytic coloring and electrodeposition coating under the same conditions as in Example 2. The extruded aluminum profile was red with a yellowish tint after electrolytic coloring, but the reddish tint disappeared after electrodeposition coating. Further, when the paint area 1 m 2 was analyzed electrodeposition coating solution after electrodeposition coating using the electrodeposition coating material liquid 1 liter, is detected Ag ion concentration 160 mg / l, the electrodeposition coating fluid is eluted Ag It turned out to be contaminated with ions.
【００１６】[0016]
【発明の効果】以上に説明したように、本発明において
は、電解着色で目標とする色調を付与する着色金属を陽
極酸化皮膜のポアに沈積させた後、着色金属の表面を保
護皮膜で覆っている。そのため、電着塗装時の電極反応
による着色金属の溶出が抑制され、色調の淡色化や電着
塗料液を汚染させることなく電着塗装アルミ材が得られ
る。As described above, in the present invention, after the colored metal that imparts the target color tone by electrolytic coloring is deposited on the pores of the anodized film, the surface of the colored metal is covered with the protective film. ing. Therefore, the elution of the colored metal due to the electrode reaction during the electrodeposition coating is suppressed, and the electrodeposition coated aluminum material can be obtained without lightening the color tone and contaminating the electrodeposition coating liquid.
フロントページの続き (56)参考文献 特開 平４−6297（ＪＰ，Ａ) 特開 昭53−1651（ＪＰ，Ａ) 特開 平１−56894（ＪＰ，Ａ) 特開 平８−50365（ＪＰ，Ａ) 特公 昭62−278296（ＪＰ，Ｂ１) 特公 昭57−126996（ＪＰ，Ｂ１) 特公 平４−33871（ＪＰ，Ｂ２) 特公 昭49−38417（ＪＰ，Ｂ１) 特公 昭59−52719（ＪＰ，Ｂ１) 特公 昭46−21836（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C25D 11/22 C25D 13/00 Continuation of the front page (56) Reference JP-A-4-6297 (JP, A) JP-A-53-1651 (JP, A) JP-A-1-56894 (JP, A) JP-A-8-50365 (JP , A) JP-B 62-278296 (JP, B1) JP-B 57-126996 (JP, B1) JP-B 4-33871 (JP, B2) JP-B 49-38417 (JP, B1) JP-B Sho 59-52719 (JP, B1) JP-B-46-21836 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) C25D 11/22 C25D 13/00
Claims (3)
陽極酸化処理し、金属塩を含むｐＨ３以下の酸性電解着
色浴に浸漬して電解着色した後、金属塩を含むｐＨ４〜
８の水溶液を用いて電解処理し、電解着色によって析出
した着色金属の上に陰極反応による薄い保護皮膜を析出
させ、その後電着塗装することを特徴とする電着塗装ア
ルミ材の製造方法。1. An aluminum or aluminum alloy material is anodized, immersed in an acidic electrolytic coloring bath containing a metal salt and having a pH of 3 or less, and electrolytically colored.
8. A method for producing an electrodeposition coated aluminum material, which comprises performing electrolytic treatment using the aqueous solution of No. 8, depositing a thin protective coating by cathodic reaction on a colored metal deposited by electrolytic coloring, and then performing electrodeposition coating.
量を５〜５００クーロン／ｍ2の範囲に調整して電解処
理する請求項１記載の電着塗装アルミ材の製造方法。 2. The method for producing an electrodeposition coated aluminum material according to claim 1, wherein the electrolytic amount is adjusted so that the amount of electricity passing through the electrolytically colored aluminum material is in the range of 5 to 500 coulomb / m 2 .
形成する請求項１又は２記載の電着塗装アルミ材の製造
方法。3. The method for producing an electrodeposition coated aluminum material according to claim 1, wherein a protective film having a film thickness of 0.01 to 0.1 μm is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07889398A JP3391252B2 (en) | 1998-03-26 | 1998-03-26 | Manufacturing method of electrodeposited aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07889398A JP3391252B2 (en) | 1998-03-26 | 1998-03-26 | Manufacturing method of electrodeposited aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11269696A JPH11269696A (en) | 1999-10-05 |
| JP3391252B2 true JP3391252B2 (en) | 2003-03-31 |
Family
ID=13674502
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07889398A Expired - Fee Related JP3391252B2 (en) | 1998-03-26 | 1998-03-26 | Manufacturing method of electrodeposited aluminum |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2007009803A (en) * | 2005-02-15 | 2007-10-03 | Navy | Composition and process for preparing chromium-zirconium coatings on metal substrates. |
| KR20080000564A (en) * | 2005-02-15 | 2008-01-02 | 더 유나이티드 스테이트 오브 아메리카 에즈 레프레센티 비 더 세크리터리 오브 더 네이비 | Composition and process for preparing protective coatings on metal substrates |
| US20160040312A1 (en) | 2013-03-15 | 2016-02-11 | United Technologies Corporation | Sacrificial coating and procedure for electroplating aluminum on aluminum alloys |
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1998
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH11269696A (en) | 1999-10-05 |
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