JP6695767B2 - Method for manufacturing aluminum coating material - Google Patents

Method for manufacturing aluminum coating material Download PDF

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JP6695767B2
JP6695767B2 JP2016189602A JP2016189602A JP6695767B2 JP 6695767 B2 JP6695767 B2 JP 6695767B2 JP 2016189602 A JP2016189602 A JP 2016189602A JP 2016189602 A JP2016189602 A JP 2016189602A JP 6695767 B2 JP6695767 B2 JP 6695767B2
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大祐 橋本
大祐 橋本
裕二 増山
裕二 増山
山田 邦博
邦博 山田
徹 江口
徹 江口
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Showa Denko KK
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本発明は、陽極酸化皮膜を形成したアルミニウム基材に透明塗料で塗装されたアルミニウム塗装材の製造方法に関する。   The present invention relates to a method for producing an aluminum coating material in which an aluminum base material having an anodized film is coated with a transparent paint.

なお、本明細書において、「アルミニウム」の語は、AlおよびAl合金を含む意味で用いる。   In this specification, the term “aluminum” is used to include Al and Al alloys.

アルミニウムは軽量で加工性および耐食性に優れていることから、車両、建材、家庭用品等の広範囲で用いられている。また、アルミニウムは美しい金属光沢を有していることから、アルミニウム素地を外観に現して使用されることがある。このような金属光沢を生かしたアルミニウム材として、陽極酸化皮膜を形成して耐食性を高め、さらにクリア樹脂で塗装したアルミニウム塗装材が知られている。陽極酸化皮膜は表面に無数の微細孔を有する多孔質構造であり汚れが付きやすく耐食性が低いので、陽極酸化処理の後処理として、微細孔を封じて不活性化する封孔処理を施すのが一般的である。封孔処理手段としては、純水に酢酸ニッケル等の封孔助剤を添加した高温の水溶液に所定の時間浸漬させる方法がある。   Since aluminum is lightweight and has excellent workability and corrosion resistance, it is widely used in vehicles, building materials, household products and the like. In addition, since aluminum has a beautiful metallic luster, it may be used by showing the appearance of the aluminum base. As an aluminum material that makes use of such metallic luster, an aluminum coating material is known in which an anodized film is formed to enhance corrosion resistance, and which is further coated with a clear resin. Since the anodized film has a porous structure with innumerable fine pores on the surface and is easily soiled and has low corrosion resistance, it is recommended to perform a sealing treatment to seal the fine pores and inactivate it as a post-treatment of the anodizing treatment. It is common. As a sealing treatment means, there is a method of immersing in a high temperature aqueous solution in which pure water and a sealing aid such as nickel acetate are added for a predetermined time.

上記の封孔処理後に焼付塗装を行うと陽極酸化皮膜にクラックが発生することがある。クラックは塗膜が不透明で十分な厚さがあれば隠蔽できるものであり、クラックによって外観品質が損なわれることはない。しかし、透明塗料の場合は塗膜を通してクラックが見えるので外観品質が低下する。例えば、車両の外面に取り付けられるルーフレール材は金属光沢を活かした外観であり、微細なクラックでも製品価値に影響を与える。   If baking coating is performed after the above sealing treatment, cracks may occur in the anodized film. The cracks can be concealed if the coating film is opaque and has a sufficient thickness, and the appearance quality is not impaired by the cracks. However, in the case of transparent paint, cracks can be seen through the coating film, so that the appearance quality is deteriorated. For example, the roof rail material attached to the outer surface of the vehicle has an appearance that takes advantage of metallic luster, and even minute cracks affect the product value.

高温加熱処理による陽極酸化皮膜のクラックの発生を阻止する方法として、半封孔処理する第1工程と、室温以上の温度で乾燥する第2工程と、外気と遮断状態で封入処理する第3工程とを行うことが提案されている(特許文献1)。   As a method for preventing the generation of cracks in the anodized film due to high-temperature heat treatment, a first step of semi-sealing treatment, a second step of drying at a temperature of room temperature or higher, and a third step of sealing treatment in a state of being shielded from the outside air It has been proposed to do (Patent Document 1).

特開平10−130884号公報Japanese Patent Laid-Open No. 10-130884

しかし、特許文献1に記載された方法でもクラックの抑制は不十分である。しかも、第3工程は被処理材を容器内に乾燥剤とともに封入する処理であり、従来の封孔処理では使用しない新たな装置を必要とする。しかも、封孔処理後に2つの工程を要し、時間と手間のかかる面倒な作業である。   However, even with the method described in Patent Document 1, suppression of cracks is insufficient. Moreover, the third step is a process of enclosing the material to be processed together with a desiccant in a container, and requires a new device that is not used in the conventional sealing process. In addition, two steps are required after the sealing treatment, which is a time-consuming and troublesome work.

本発明は、上記の背景技術に鑑み、陽極酸化皮膜を形成したアルミニウム基材に対して、複雑な装置や工程によることなく、焼付塗装時にクラックの発生を抑制できる方法を提供する。   In view of the above background art, the present invention provides a method capable of suppressing the occurrence of cracks during baking coating on an aluminum base material on which an anodized film is formed, without using a complicated device or process.

即ち、本発明は下記の[1]〜[4]に記載の構成を有する。   That is, the present invention has the configurations described in [1] to [4] below.

[1]アルミニウム基材の表面に陽極酸化皮膜を形成する陽極酸化処理と、
前記陽極酸化皮膜をニッケルイオン濃度が3mg/L未満の水で封孔処理する第一封孔処理と、
封孔処理されたアルミニウム基材に透明塗料を塗布して焼き付ける焼付塗装処理と、
を行うことを特徴とするアルミニウム塗装材の製造方法。
[1] Anodizing treatment for forming an anodized film on the surface of the aluminum base material,
A first sealing treatment for sealing the anodized film with water having a nickel ion concentration of less than 3 mg / L;
A baking coating process in which a transparent coating material is applied to a sealed aluminum base material and baked.
A method for producing an aluminum coating material, comprising:

[2]前記第一封孔処理後に、酢酸ニッケル水溶液で封孔処理する第二封孔処理を行う前項1に記載のアルミニウム塗装材の製造方法。   [2] The method for producing an aluminum coating material according to the above item 1, wherein after the first sealing treatment, a second sealing treatment of sealing with an aqueous solution of nickel acetate is performed.

[3]前記焼付塗装処理において透明塗料を110℃以上で焼き付ける前項1または2に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 as described in 1 or 2 above, wherein the transparent coating material is baked at 110 ° C. or higher in the baking coating treatment.

[4]前記アルミニウム塗装材は車両のルーフパネルの外面に取り付けられるルーフレール材である前項1〜3のいずれか1項に記載のアルミニウム塗装材の製造方法。   [4] The method for producing an aluminum coating material according to any one of the above items 1 to 3, wherein the aluminum coating material is a roof rail material attached to an outer surface of a roof panel of a vehicle.

上記[1]に記載のアルミニウム塗装材の製造方法によれば、処理液中のニッケルイオン濃度を規制した第一封孔処理によって、陽極酸化皮膜の孔内部に水和アルミナが充填されて皮膜が強化されるので、焼付塗装を行っても皮膜にクラックが発生しない。従って、金属光沢をもち、透明塗膜によって表面光沢が高められた外観のアルミニウム塗装材を製造できる。   According to the method for producing an aluminum coating material as described in [1] above, the hydrated alumina is filled inside the pores of the anodized film by the first sealing treatment in which the nickel ion concentration in the treatment liquid is regulated to form a film. Since it is reinforced, cracks do not occur in the film even after baking. Therefore, it is possible to manufacture an aluminum coating material that has a metallic luster and has an appearance whose surface gloss is enhanced by the transparent coating film.

しかも、第一封孔処理は封孔処理の処理液中のニッケルイオン濃度の規制した処理であるから、別段の装置や複雑な工程管理を必要としない。   Moreover, since the first sealing treatment is a treatment in which the concentration of nickel ions in the treatment liquid of the sealing treatment is regulated, no additional device or complicated process control is required.

上記[2]に記載のアルミニウム塗装材の製造方法によれば、第一封孔処理に加えて第二封孔処理で水酸化ニッケルを析出させることによって、短時間で皮膜を強化することができる。   According to the method for producing an aluminum coating material as described in [2] above, the coating can be strengthened in a short time by precipitating nickel hydroxide by the second sealing treatment in addition to the first sealing treatment. ..

上記[3]に記載のアルミニウム塗装材の製造方法によれば、110℃以上の高温で焼き付けてもクラックが発生せず、金属光沢をもち、透明塗膜によって表面光沢が高められた外観のアルミニウム塗装材を製造できる。   According to the method for producing an aluminum coating material as described in [3] above, aluminum does not cause cracks even when baked at a high temperature of 110 ° C. or higher, has a metallic luster, and has an appearance that has a surface gloss enhanced by a transparent coating film. Can manufacture coating materials.

上記[4]アルミニウム塗装材の製造方法によれば、ルーフレール材において上記の効果が得られる。   According to the method [4] for manufacturing an aluminum coating material, the above effects can be obtained in the roof rail material.

アルミニウム塗装材の断面図である。It is sectional drawing of an aluminum coating material. 実施例のアルミニウム基材として用いたルーフレール材の断面図である。It is sectional drawing of the roof rail material used as the aluminum base material of an Example.

図1に示すように、本発明のアルミニウム塗装材1は、アルミニウム基材11の表面に陽極酸化皮膜12を有し、陽極酸化皮膜12は透明塗膜13に覆われている。以下に、前記アルミニウム塗装材1の製造方法について材料とともに詳述する。   As shown in FIG. 1, the aluminum coating material 1 of the present invention has an anodized film 12 on the surface of an aluminum base material 11, and the anodized film 12 is covered with a transparent coating film 13. Below, the method of manufacturing the aluminum coating material 1 will be described in detail together with the materials.

[アルミニウム基材]
アルミニウム基材11の組成は限定されず、純アルミニウムおよび各種アルミニウム合金を用いることができる。また、アルミニウム基材11の形状も限定されない。アルミニウムは成形性が良好であることから、押出材や押出材に曲げ加工等の塑性加工を施したアルミニウム基材を用いることも好ましい。例えば、車両のルーフパネルに取り付けられるルーフレール材の作製には、強度と成形性の観点から6000系アルミニウム合金の中空押出材をルーフパネルの曲面に沿うように曲げ加工したアルミニウム基材が好ましく用いられる。
[Aluminum base material]
The composition of the aluminum base material 11 is not limited, and pure aluminum and various aluminum alloys can be used. Also, the shape of the aluminum base material 11 is not limited. Since aluminum has good formability, it is also preferable to use an extruded material or an aluminum base material obtained by subjecting the extruded material to plastic working such as bending. For example, an aluminum base material obtained by bending a hollow extruded material of a 6000 series aluminum alloy along the curved surface of the roof panel is preferably used from the viewpoint of strength and formability in the production of a roof rail material that is attached to a roof panel of a vehicle. ..

また、押出材は表面平滑性が必ずしも高くないので、陽極酸化処理前に、研磨して光沢度を高めておくことで美しい金属光沢をもつアルミニウム塗装材1を作製できる。研磨方法は限定されず、バフ研磨、化学研磨、電解研磨等周知の方法により行い、2種以上の方法を組み合わせて研磨しても良い。   In addition, since the extruded material does not necessarily have high surface smoothness, the aluminum coating material 1 having a beautiful metallic luster can be produced by polishing and increasing the glossiness before anodizing treatment. The polishing method is not limited, and known methods such as buffing, chemical polishing, and electrolytic polishing may be performed, and polishing may be performed by combining two or more methods.

[陽極酸化処理工程]
上記のアルミニウム基材11に対して、要すれば洗浄し、その後陽極酸化処理を行う。陽極酸化処理条件は限定されず、アルミニウム塗装材1の用途に応じて適宜設定する。例えば、鉛板、黒鉛板等を陰極とし、電解液として硫酸、シュウ酸、クロム酸、リン酸、あるいは混合酸液等を用いて直流またはパルス波形にて電気分解を行い、電解後は水で洗浄する。前記陽極酸化皮膜12の厚さにも制限はなく、アルミニウム塗装材1の用途に応じて適宜設定する。例えば、耐食性が求められる自動車用ルーフレールでは厚さ5μm〜20μmの皮膜を形成することが好ましい。
[Anodizing process]
If necessary, the aluminum base material 11 is washed and then anodized. The anodizing condition is not limited and may be appropriately set depending on the application of the aluminum coating material 1. For example, using a lead plate, a graphite plate, or the like as a cathode, and using sulfuric acid, oxalic acid, chromic acid, phosphoric acid, or a mixed acid solution as an electrolytic solution, electrolysis is performed with a direct current or a pulse waveform, and then water is used after electrolysis. Wash. The thickness of the anodized film 12 is not limited, and may be set appropriately according to the application of the aluminum coating material 1. For example, it is preferable to form a film having a thickness of 5 μm to 20 μm on an automobile roof rail that requires corrosion resistance.

[封孔処理]
封孔処理は、処理液中のニッケルイオン濃度を規定して行う第一封孔処理を行い、要すればさらに酢酸ニッケル水溶液で第二封孔処理を行う。
[Sealing treatment]
As the sealing treatment, the first sealing treatment is performed by defining the nickel ion concentration in the treatment liquid, and if necessary, the second sealing treatment is further performed with a nickel acetate aqueous solution.

陽極酸化処理後の皮膜組織は表面に開口する微細孔を有しているので、封孔処理を行って微細孔の開口部を閉じる。陽極酸化皮膜12の微細孔を閉じることにより、陽極酸化皮膜12の強度が耐食性、耐酸性を向上させることができる。また、封孔により防汚性が向上するので、未塗装材の保管時や搬送時の汚損を防ぐことができる。このため、封孔処理は陽極酸化処理工程に続いて行い、未封孔処理材の移動時間および移動距離をできる限り短くすることが好ましい。   Since the film structure after the anodizing treatment has fine pores opening on the surface, a sealing treatment is performed to close the openings of the fine pores. By closing the fine pores of the anodized film 12, the strength of the anodized film 12 can improve the corrosion resistance and the acid resistance. Further, since the antifouling property is improved by the sealing, it is possible to prevent the unpainted material from being damaged during storage or transportation. For this reason, it is preferable that the sealing treatment is performed after the anodizing treatment step, and the moving time and the moving distance of the unsealed material are shortened as much as possible.

(第一封孔処理)
ニッケルイオン濃度が3mg/L未満の処理液に浸漬して封孔処理を行う。
(First sealing treatment)
The sealing treatment is performed by immersing in a treatment liquid having a nickel ion concentration of less than 3 mg / L.

温処理液浸漬による封孔の場合、孔の壁面でアルミナの溶解が起こり、同時に微粒子状の水和アルミナが析出し、孔が塞がれてくる。従来のニッケル塩を含有する処理水で封孔を行う場合、水和アルミナの形成に加え、ニッケル塩の加水分解による水酸化ニッケルの形成によっても孔が塞がれていくことになる。水酸化ニッケルの析出は孔の開口部付近に析出しやすく、短時間で封孔できることから、孔内部の水和アルミナによる充填が不十分であることが考えられる。そのため、陽極酸化皮膜12の強度が弱く、塗料の焼付時に生じる基材の線膨張に対して、クラックを生じてしまうものと考えられる。一方、ニッケルイオン濃度が3mg/L未満であれば、実質的に析出する水酸化ニッケルは無く、孔の内部から水和アルミナよる充填を十分に行うことができるため、陽極酸化皮膜12の強度が向上し、塗料の焼付時に生じる基材の線膨張に対し、クラックを発生することなく耐えることができるものと推察される。 In the case of sealing by immersion in a hot treatment liquid, alumina is dissolved on the wall surface of the pores, and at the same time fine-grained hydrated alumina is deposited and the pores are closed. When the pores are sealed with treated water containing a conventional nickel salt, the pores are blocked by formation of hydrated alumina and formation of nickel hydroxide by hydrolysis of the nickel salt. Precipitation of nickel hydroxide tends to occur in the vicinity of the opening of the hole, and the hole can be sealed in a short time. Therefore, it is considered that the filling of the inside of the hole with hydrated alumina is insufficient. Therefore, it is considered that the strength of the anodic oxide film 12 is weak and cracks are generated due to the linear expansion of the base material that occurs when the coating material is baked. On the other hand, if it is less than the nickel ion concentration 3 mg / L, substantially nickel hydroxide precipitation is not because it can be done from within the pores sufficiently filled by the hydrated alumina, the strength of the anodized film 12 It is presumed that it is possible to withstand the linear expansion of the base material that occurs during baking of the coating material without causing cracks.

ニッケルイオン濃度を3mg/L未満の処理液として、イオン交換樹脂等で塩類を除去した脱塩水(イオン交換水)、逆浸透膜で濾過したRO水、蒸留水等を使用できる。   As a treatment liquid having a nickel ion concentration of less than 3 mg / L, demineralized water (ion exchanged water) from which salts have been removed by an ion exchange resin, RO water filtered by a reverse osmosis membrane, distilled water, or the like can be used.

前工程で陽極酸化処理を施したアルミニウム基材11は水洗した後に第一封孔処理の処理液に浸漬されるが、水洗してもアルミニウム基材11に付着して金属や塩類が処理液に持ち込まれることがある。しかし、前記ニッケルイオン濃度は封孔処理を行う時の濃度であるからアルミニウム基材11に付着して持ち込まれたニッケルイオンは稀である。従って、多数のアルミニウム基材11の封孔処理を連続して行っても、処理槽に投入する処理液中のニッケルイオン濃度を厳密に管理する必要性は低い。ただし、ニッケルイオン濃度が3mg/L以上に上昇していないことを定期的に確認することは好ましい。   The aluminum base material 11 that has been anodized in the previous step is washed with water and then immersed in the treatment liquid for the first sealing treatment. May be brought in. However, since the nickel ion concentration is the concentration at the time of performing the sealing treatment, nickel ions attached to the aluminum base material 11 and brought in are rare. Therefore, even if the sealing treatment of a large number of aluminum base materials 11 is continuously performed, it is not necessary to strictly control the nickel ion concentration in the treatment liquid to be introduced into the treatment tank. However, it is preferable to periodically confirm that the nickel ion concentration has not risen to 3 mg / L or more.

前記処理液の液温は70℃以上が好ましく、特に好ましい液温は80℃〜100℃である。また、処理時間は60秒〜500秒の範囲が好ましい。処理時間が60秒未満では封孔が不十分になるおそれがある。また500秒の封孔処理をすると孔内に水和アルミナが充填されるので、500秒を超える処理は不要であり、むしろ処理効率の低下を招くことになる。特に好ましい処理時間は80秒〜200秒である。   The liquid temperature of the treatment liquid is preferably 70 ° C. or higher, and the particularly preferable liquid temperature is 80 ° C. to 100 ° C. The processing time is preferably in the range of 60 seconds to 500 seconds. If the treatment time is less than 60 seconds, the sealing may be insufficient. Further, when the sealing treatment is performed for 500 seconds, the hydrated alumina is filled in the pores, so that the treatment for more than 500 seconds is unnecessary, and the treatment efficiency is rather lowered. Particularly preferable processing time is 80 seconds to 200 seconds.

第一封孔処理後はアルミニウム基材11を水洗する。   After the first sealing treatment, the aluminum base material 11 is washed with water.

(第二封孔処理)
上述したように、ニッケル塩による封孔処理では、水和アルミナの形成に加えて孔の開口部付近に水酸化ニッケルが析出する。本発明の方法では、第一封孔処理によって孔の内部に水和アルミナが充填されているので、孔の開口部付近に析出する水酸化ニッケルによって孔内が空洞化することはない。水酸化ニッケルの析出は短時間で起こるので、第一封孔処理に第二封孔処理を組み合わせることにより、短時間で皮膜を強化することができる。
(Second sealing treatment)
As described above, in the sealing treatment with the nickel salt, nickel hydroxide is deposited in the vicinity of the openings of the pores in addition to the formation of hydrated alumina. In the method of the present invention, since the hydrated alumina is filled in the inside of the pores by the first sealing treatment, the inside of the pores will not be hollowed by the nickel hydroxide deposited near the openings of the pores. Precipitation of nickel hydroxide occurs in a short time, so that the film can be strengthened in a short time by combining the first sealing treatment with the second sealing treatment.

第二封孔処理の処理液は酢酸ニッケル水溶液を用いて行うこととし、好ましい酢酸ニッケル濃度は4g/L〜10g/Lである。また、液温は65℃〜80℃が好ましく、処理時間は400秒〜600秒が好ましい。なお、処理液にはホウ酸等の他の封孔助剤を適宜含有させることができる。   The treatment liquid for the second sealing treatment is performed using an aqueous nickel acetate solution, and the preferable nickel acetate concentration is 4 g / L to 10 g / L. The liquid temperature is preferably 65 ° C to 80 ° C, and the treatment time is preferably 400 seconds to 600 seconds. Incidentally, the treatment liquid may appropriately contain other sealing aid such as boric acid.

第二封孔処理後はアルミニウム基材11を水洗する。   After the second sealing treatment, the aluminum base material 11 is washed with water.

上記の封孔処理を施したアルミニウム基材11は乾燥させて、次工程の焼付塗装処理に備える。封孔処理は多孔質の陽極酸化皮膜が汚損されないように陽極酸化処理に続いて行うことが好ましいが、封孔処理されたアルミニウム基材11は防汚性が高いので、焼付塗装処理は時間を隔てて行ってもよい。   The aluminum base material 11 that has been subjected to the above sealing treatment is dried and prepared for the baking and coating treatment in the next step. The sealing treatment is preferably performed after the anodic oxidation treatment so that the porous anodic oxide film is not contaminated. However, since the sealed aluminum base material 11 has a high antifouling property, the baking coating treatment takes time. You may go apart.

[焼付塗装処理]
封孔処理をしたアルミニウム基材11に透明塗料を塗布して焼き付ける。
[Baking coating treatment]
A transparent coating material is applied to the aluminum base material 11 that has been subjected to the sealing treatment and baked.

塗料の種類は焼付可能である限り限定されず、アクリル樹脂、ポリエステル、エポキシ、ポリウレタン、ポリオレフィン、ポリスルフォン等の透明樹脂、あるいはこれらの透明樹脂にシリコンを配合した透明塗料を使用できる。   The type of paint is not limited as long as it can be baked, and transparent resins such as acrylic resins, polyesters, epoxies, polyurethanes, polyolefins and polysulfones, or transparent paints obtained by blending these transparent resins with silicon can be used.

塗装手段も限定されず、静電塗装、スプレー塗装等の周知の方法で塗膜を形成し、その後に焼き付けて塗膜を硬化させる。   The coating means is also not limited, and a coating film is formed by a known method such as electrostatic coating or spray coating, and then baked to cure the coating film.

焼付温度は限定されず、透明塗料の種類に応じた温度で焼付を行う。クラックはアルミニウム基材の熱膨張によって発生するので、低温焼付では元々クラックの発生が少ない。このため、焼付温度が高い場合に上述した第一封孔処理の効果が顕著に発揮され、本発明の適用意義が大きい。本発明において好ましい焼付温度は110℃以上であり、特に好ましい焼付温度は110℃〜130℃である。   The baking temperature is not limited, and the baking is performed at a temperature according to the type of transparent paint. Since the cracks are generated by the thermal expansion of the aluminum base material, the cracks are originally few in the low temperature baking. Therefore, when the baking temperature is high, the effect of the first sealing treatment described above is remarkably exhibited, and the significance of application of the present invention is great. In the present invention, the preferable baking temperature is 110 ° C or higher, and the particularly preferable baking temperature is 110 ° C to 130 ° C.

本発明の方法によれば、陽極酸化皮膜12は孔内部まで水和アルミナが充填されて強化されているので、焼付時のアルミニウム基材の熱膨張に対してクラックが発生することがない。このため、金属光沢をもち、透明塗膜によって表面光沢が高められた美しい外観が得られる。また、第一封孔処理は封孔処理の処理液中のニッケルイオン濃度の規制した処理であるから、別段の装置や複雑な工程管理を必要としない。従来のアルミニウム塗装材の生産ラインにおいて封孔処理槽に入れる処理液を変更するだけで実施でき、その処理液も安価である。   According to the method of the present invention, since the anodic oxide coating 12 is filled with hydrated alumina up to the inside of the pores to be reinforced, cracks do not occur due to thermal expansion of the aluminum base material during baking. For this reason, it has a metallic luster and a beautiful appearance in which the surface gloss is enhanced by the transparent coating film can be obtained. Further, since the first sealing treatment is a treatment in which the nickel ion concentration in the treatment liquid of the sealing treatment is regulated, no separate device or complicated process control is required. It can be carried out by simply changing the treatment liquid put in the sealing treatment tank in the conventional aluminum coating material production line, and the treatment liquid is also inexpensive.

実施例1、2および比較例のアルミニウム塗装材を作製した。図1に参照されるこれらのアルミニウム塗装材1は、アルミニウム基材11の表面に陽極酸化皮膜12および透明塗膜13を有していることが共通しているが作製方法が異なる。   Aluminum coating materials of Examples 1 and 2 and Comparative Example were produced. These aluminum coating materials 1 referred to in FIG. 1 are common in that they have an anodized film 12 and a transparent coating film 13 on the surface of an aluminum base material 11, but the manufacturing method is different.

[アルミニウム基材]
各例共通のアルミニウム基材11として図2に示す中空押出材を用いた。前記アルミニウム基材11は、A6063からなり、車両のルーフパネルの外面に取り付けられるルーフレール材である。前記アルミニウム基材11は、長さ2,000mmに切断し、さらに全外周面をバフ研磨し、さらに化学研磨した。
[Aluminum base material]
The hollow extruded material shown in FIG. 2 was used as the aluminum base material 11 common to each example. The aluminum base material 11 is a roof rail member made of A6063 and attached to the outer surface of the roof panel of the vehicle. The aluminum base material 11 was cut into a length of 2,000 mm, and the entire outer peripheral surface was buffed and further chemically polished.

前記アルミニウム基材11に対し、陽極酸化処理、封孔処理、焼付塗装処理を行った。前記陽極酸化処理および焼付塗装処理は各例共通であり、封孔処理は各例で処理条件が異なる。   The aluminum base material 11 was subjected to anodizing treatment, sealing treatment, and baking coating treatment. The anodizing treatment and the baking coating treatment are common to all the examples, and the sealing condition is different in each example.

[陽極酸化処理]
前記アルミニウム基材11に陽極酸化処理を施して膜厚10μmの陽極酸化皮膜12を形成した。この陽極酸化処理の処理条件は、電解浴組成:180g/L硫酸水溶液、浴温:20℃、電流密度:1.0A/dm、電解時間:30分である。その後アルミニウム基材11を水洗した。
[Anodic oxidation treatment]
The aluminum base material 11 was anodized to form an anodized film 12 having a film thickness of 10 μm. The treatment conditions of this anodizing treatment are: electrolytic bath composition: 180 g / L sulfuric acid aqueous solution, bath temperature: 20 ° C., current density: 1.0 A / dm 2 , electrolysis time: 30 minutes. Then, the aluminum base material 11 was washed with water.

[封孔処理]
実施例1は、イオン交換樹脂で脱塩したイオン交換水を85℃に保ち、このイオン交換水に前記アルミニウム基材11を150秒間浸漬する第一封孔処理を行った。前記イオン交換水中のニッケルイオン濃度は2.98mg/Lである。前記第一封孔処理後にアルミニウム基材11を水洗し、乾燥させた。
[Sealing treatment]
In Example 1, ion-exchanged water desalted with an ion-exchange resin was kept at 85 ° C., and the aluminum base material 11 was immersed in this ion-exchanged water for 150 seconds for the first sealing treatment. The nickel ion concentration in the ion-exchanged water is 2.98 mg / L. After the first sealing treatment, the aluminum base material 11 was washed with water and dried.

実施例2は、実施例1と同じ方法で第一封孔処理を行ってアルミニウム基材11を水洗し、さらに第二封孔処理を行った。第二封孔処理は、酢酸ニッケル5g/Lおよびホウ酸5g/Lを含有する水溶液を70℃に保ち、この水溶液にアルミニウム基材11を9分間浸漬して行った。前記第二封孔処理後にアルミニウム基材11を水洗し、乾燥させた。   In Example 2, the first sealing treatment was performed in the same manner as in Example 1, the aluminum substrate 11 was washed with water, and the second sealing treatment was further performed. The second sealing treatment was performed by keeping an aqueous solution containing nickel acetate 5 g / L and boric acid 5 g / L at 70 ° C. and immersing the aluminum base material 11 in this aqueous solution for 9 minutes. After the second sealing treatment, the aluminum base material 11 was washed with water and dried.

比較例は、実施例2の第二封孔処理と同じ方法で封孔処理を行い、その後にアルミニウム基材11を水洗し、乾燥させた。   In the comparative example, the sealing treatment was performed by the same method as the second sealing treatment of Example 2, and then the aluminum base material 11 was washed with water and dried.

[焼付塗装処理]
封孔処理後のアルミニウム基材11にシリコンアクリル樹脂塗料(商品名「アルコSP」、ナトコ株式会社製)を静電塗装し、厚さ8μmの透明塗膜13を形成した。さらに、90℃、110℃、110℃、120℃、130℃の5種類の温度でそれぞれ20分間焼き付けてアルミニウム塗装材1を得た。
[Baking coating treatment]
A silicon acrylic resin paint (trade name “Arco SP”, manufactured by Natco Co., Ltd.) was electrostatically applied to the aluminum base material 11 after the sealing treatment to form a transparent coating film 13 having a thickness of 8 μm. Further, it was baked for 20 minutes at each of five temperatures of 90 ° C., 110 ° C., 110 ° C., 120 ° C. and 130 ° C. to obtain an aluminum coating material 1.

各例のアルミニウム塗装材1を照度1000ルクスの環境下で目視観察してクラックの有無を調べた。表1に観察結果を示す。   The aluminum coating material 1 of each example was visually observed in an environment with an illuminance of 1000 lux to check for cracks. Table 1 shows the observation results.

Figure 0006695767
Figure 0006695767

表1の観察結果より、ニッケルイオン濃度を規制した処理水で封孔処理することによりクラックの発生を防止できることを確認できた。   From the observation results in Table 1, it was confirmed that the generation of cracks can be prevented by performing the sealing treatment with the treated water in which the nickel ion concentration is regulated.

本発明は、アルミニウムの金属光沢が外観に表されたアルミニウム塗装材の製造に適用できる。   INDUSTRIAL APPLICABILITY The present invention can be applied to the production of an aluminum coating material in which the metallic luster of aluminum is expressed in appearance.

1…アルミニウム塗装材
11…アルミニウム基材(ルーフレール材、中空押出材)
12…陽極酸化皮膜
13…透明塗膜
1 ... Aluminum coating material 11 ... Aluminum base material (roof rail material, hollow extruded material)
12 ... Anodic oxide coating 13 ... Transparent coating

Claims (3)

アルミニウム基材の表面に陽極酸化皮膜を形成する陽極酸化処理と、
前記陽極酸化皮膜をニッケルイオン濃度が3mg/L未満に規制された水で封孔処理する第一封孔処理と、
前記第一封孔処理後に、酢酸ニッケル水溶液で封孔処理する第二封孔処理と、
封孔処理されたアルミニウム基材に透明塗料を塗布して焼き付ける焼付塗装処理と、
を行うことを特徴とするアルミニウム塗装材の製造方法。
Anodizing treatment to form an anodized film on the surface of the aluminum substrate,
A first sealing treatment for sealing the anodized film with water whose nickel ion concentration is regulated to less than 3 mg / L;
After the first sealing treatment, a second sealing treatment of sealing with an aqueous solution of nickel acetate,
A baking coating process in which a transparent coating material is applied to a sealed aluminum base material and baked.
A method for producing an aluminum coating material, comprising:
前記焼付塗装処理において透明塗料を110℃以上で焼き付ける請求項に記載のアルミニウム塗装材の製造方法。 The method for producing an aluminum coating material according to claim 1 , wherein the transparent coating material is baked at 110 ° C. or higher in the baking coating treatment. 前記アルミニウム塗装材は車両のルーフパネルの外面に取り付けられるルーフレール材である請求項1または2に記載のアルミニウム塗装材の製造方法。
The aluminum coating material manufacturing method of an aluminum coating material according to claim 1 or 2 is a roof rail member which is attached to the outer surface of the roof panel of a vehicle.
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