JP5589150B1 - Partial anodizing method - Google Patents

Partial anodizing method Download PDF

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JP5589150B1
JP5589150B1 JP2014036693A JP2014036693A JP5589150B1 JP 5589150 B1 JP5589150 B1 JP 5589150B1 JP 2014036693 A JP2014036693 A JP 2014036693A JP 2014036693 A JP2014036693 A JP 2014036693A JP 5589150 B1 JP5589150 B1 JP 5589150B1
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aluminum material
electrolytic solution
electrolytic
electrode
injection
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JP2015160987A (en
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亮太 柿澤
仁 新村
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Aisin Keikinzoku Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/022—Anodisation on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form

Abstract

【課題】アルミニウム素材を浸漬したり、部分的に密閉するための電解槽が不要な部分陽極酸化処理方法の提供を目的とする。
【解決手段】アルミニウム素材の部分的に陽極酸化皮膜を形成したい部位に向けて、電解液を噴射するための噴射口を有する電極を配置し、前記噴射口からアルミニウム素材に向けて電解液を噴射しながら陽極酸化し、前記アルミニウム素材表面に噴射された電解液は自然放流させたことを特徴とする。
【選択図】 図１An object of the present invention is to provide a partial anodizing method that does not require an electrolytic bath for immersing or partially sealing an aluminum material.
An electrode having an injection port for injecting an electrolytic solution is arranged toward a part of an aluminum material where an anodic oxide film is to be formed, and the electrolytic solution is injected from the injection port toward the aluminum material. The electrolytic solution anodized while being sprayed on the surface of the aluminum material was naturally discharged.
[Selection] Figure 1

Description

本発明はアルミニウム製品に部分的に陽極酸化皮膜を形成するための陽極酸化処理方法に関する。   The present invention relates to an anodizing method for partially forming an anodized film on an aluminum product.

アルミニウム素材に陽極酸化皮膜を形成する場合にアルミニウム素材を電解槽に浸漬し、アルミニウム素材を陽極とし、電解槽内側に配設した陰極との間に電流を流し、電解処理するのが一般的である。
しかし、アルミニウム素材が押出形材等を用いた比較的長い製品である場合に、電解槽が大きくなり処理装置が大型化する問題があった。
また、製品によっては部分的にのみ陽極酸化皮膜が要求される場合もある。
そこで本出願人は、これまでに電解槽の小型化を目的とした部分陽極酸化装置を提案している（特許文献１）。
同技術は電解槽の小型化に有力であるものの、電解槽が必要である点で、さらなる改良が期待された。 When forming an anodic oxide film on an aluminum material, it is common to immerse the aluminum material in an electrolytic cell, use the aluminum material as the anode, and pass an electric current between the cathode disposed inside the electrolytic cell and perform electrolytic treatment. is there.
However, when the aluminum material is a relatively long product using an extruded profile or the like, there is a problem that the electrolytic cell becomes large and the processing apparatus becomes large.
In addition, some products may require an anodic oxide film only partially.
Therefore, the present applicant has proposed a partial anodizing apparatus for the purpose of downsizing the electrolytic cell (Patent Document 1).
Although this technology is effective in reducing the size of the electrolytic cell, further improvement was expected in that the electrolytic cell was necessary.

特開２０１４−９３７９号公報JP 2014-9379 A

本発明は、アルミニウム素材を浸漬したり、部分的に密閉するための電解槽が不要な部分陽極酸化処理方法の提供を目的とする。   An object of the present invention is to provide a partial anodizing method that does not require an electrolytic bath for immersing or partially sealing an aluminum material.

本発明に係る部分陽極酸化処理方法は、押出形材からなるアルミニウム素材の部分的に陽極酸化皮膜を形成したい部位に向けて、電解槽を設けることなく電解液を噴射するための複数の噴射口をアルミニウム素材の長手方向に沿って有する電極を配置し、前記複数の噴射口の噴射口ピッチが１００ｍｍ以下であり、前記噴射口からアルミニウム素材に向けて電解液を噴射しながら陽極酸化し、前記アルミニウム素材表面に噴射された電解液は自然放流させたことを特徴とする。
ここで噴射口を有する電極とは、アルミニウム素材の部分的に陽極酸化処理する部位に対極として配置する陰極に電解液を噴射するための噴射口を形成する趣旨である。
また、電解液を自然放流させるとはアルミニウム素材を浸漬するための電解槽や、アルミニウム素材を部分的に密閉するための電解槽を有せずにアルミニウム素材の表面に当たった電解液は自重により流れ出し、回収及び必要に応じて循環させることをいう。
A partial anodizing treatment method according to the present invention includes a plurality of injection ports for injecting an electrolyte solution without providing an electrolytic cell toward a portion where an anodized film is to be partially formed on an aluminum material made of an extruded profile. Is disposed along the longitudinal direction of the aluminum material, the pitch of the plurality of spray ports is 100 mm or less, anodized while spraying an electrolyte solution toward the aluminum material from the spray ports, The electrolytic solution sprayed on the surface of the aluminum material is naturally discharged.
Here, the term “electrode having an injection port” is intended to form an injection port for injecting an electrolyte solution to a cathode disposed as a counter electrode in a part of an aluminum material that is partially anodized.
In addition, when the electrolytic solution is allowed to spontaneously flow, the electrolytic solution that hits the surface of the aluminum material does not have an electrolytic cell for immersing the aluminum material or an electrolytic cell for partially sealing the aluminum material. Flowing out, collecting and circulating as necessary.

本発明にあっては、前記電極と、部分的に陽極酸化皮膜を形成するアルミニウム素材表面との極間距離は、１〜３０ｍｍの範囲に設定してあるのが好ましく、電解条件は、電流密度１〜４０Ａ／ｄｍ２，電解液の噴射量がアルミニウム素材表面積１ｄｍ２当たり１．５リットル／ｍｉｎ以上であるのが好ましい。
部分的に陽極酸化処理するアルミニウム素材の表面と電極との間の距離を１〜３０ｍｍの範囲に設定した場合に、アルミニウム素材が押出形材、比較的長い場合には複数の噴射口が必要となる。
そこで、前記噴射口を複数配置する場合にあっては噴射口ピッチが１００ｍｍ以下にするのが好ましい。 In the present invention, the distance between the electrode and the surface of the aluminum material that partially forms the anodized film is preferably set in the range of 1 to 30 mm, and the electrolysis condition is the current density. 1~40A / dm 2, preferably injection amount of the electrolytic solution is an aluminum material surface area 1 dm 2 per 1.5 l / min or more.
When the distance between the surface of the aluminum material to be partially anodized and the electrode is set in the range of 1 to 30 mm, the aluminum material is an extruded shape. Become.
Therefore, in the case where a plurality of the injection ports are arranged, it is preferable that the pitch of the injection ports is 100 mm or less.

本発明においてアルミニウム素材はアルミニウム及びアルミニウム合金からなる素材をいう。
アルミニウム素材の製法としては鋳物、圧延材、押出材等各種製法により製造されたものをいう。
その中でもアルミニウム及びその合金からなる押出材であって、異形断面形状の一部の表面を部分的に陽極酸化処理するのに好適である。
このようにして陽極酸化処理された部材は、アルミニウム素材の必要な部位に均一な陽極酸化皮膜が形成される。 In the present invention, the aluminum material refers to a material made of aluminum and an aluminum alloy.
As a manufacturing method of an aluminum raw material, it means what was manufactured by various manufacturing methods, such as a casting, a rolling material, and an extruded material.
Among them, it is an extruded material made of aluminum and its alloy, and is suitable for partially anodizing a part of the surface of the irregular cross-sectional shape.
In the member thus anodized, a uniform anodic oxide film is formed on a necessary portion of the aluminum material.

本発明に係る陽極酸化処理方法を用いると電解槽を設けることなく、アルミニウム素材の必要な部位に陽極酸化皮膜を形成することができるので設備が小型化でき、低コストで品質に優れた部分陽極酸化処理部材が得られる。   When the anodizing method according to the present invention is used, an anodized film can be formed on a necessary part of an aluminum material without providing an electrolytic cell, so that the equipment can be downsized, and the partial anode is excellent in quality at low cost. An oxidation-treated member is obtained.

アルミニウム素材のワークと電極及び噴射口との配置例を示す。The example of arrangement | positioning with the workpiece | work of an aluminum material, an electrode, and a jet nozzle is shown. （ａ）は電極及び治具の配列例を示し、（ｂ）は部分拡大図を示す。(A) shows an arrangement example of electrodes and jigs, and (b) shows a partially enlarged view. 実験評価に用いた電極の配置図を示す。The layout of the electrodes used for the experimental evaluation is shown. 実験評価結果を示す。An experimental evaluation result is shown.

本発明に係る電極の配置例及び実験評価の結果例を以下図面に基づいて説明するが、本発明はこれに限定されない。   Although the example of arrangement | positioning of the electrode which concerns on this invention, and the result of experiment evaluation are demonstrated based on drawing below, this invention is not limited to this.

図１にワーク１と電極１１，１２の配置例の断面図を示し、図２に電極の斜視図を示す。
本実施例におけるワーク１は日本工業規格ＪＩＳ ６０６３Ｓ−Ｔ５からなるアルミニウム合金の押出形材で製作したワークの例である。
ワーク１のレール部に部分陽極酸化処理する例である。
ワーク１１のレール部に向けてパイプ状の電極１１と電極１２を配置した。
なお、ワーク１及び電極を保持するのに底部の治具１６と側部の側部治具１３，１４を設けてある。
ワーク１と電極１１，１２との間に電源を配線し電圧を印加する。
この際に電圧がショートしないように絶縁体１７ａ、１７ｂを適宜、配設した。
電極１１，１２は金属材のパイプからなり、電解液の通水部１１ａ，１２ａとワーク１の部分的に陽極酸化皮膜を形成したい部位に向けて電解液２０，２１の噴射口１１ｂ,１１ｃ，１２ｂ〜１２ｆを有する。
噴射口からワーク１の表面に向けて噴出した電解液はワーク１の表面に当たり、その後はワーク１と電極１１，１２との間の隙間１５等を経由して下側に自然放出される。
電極１１，１２とワーク１の表面との極間距離は１〜３０ｍｍの範囲に設定してあり、噴射口として設けた孔径は２〜１０ｍｍ，図２に示す長手方向の孔ピッチは１００ｍｍ以下に設定した。
電解液は硫酸水溶液やシュウ酸水溶液、スルホサルチル酸水溶液等の有機酸水溶液が用いられる。
電解方法としては直流、交流、パルス波形等が用いられる。
例えば、濃度１００〜３００ｇ／Ｌの硫酸水溶液を用いた場合に電流密度１〜４０Ａ／ｄｍ２の範囲に設定する。
電解処理時の電流密度が高い程発熱量も多くなり、電解液の噴射量はワーク１の陽極酸化処理する１ｄｍ２当たり１．５リットル／ｍｉｎ以上に設定する。
FIG. 1 shows a sectional view of an arrangement example of the workpiece 1 and the electrodes 11 and 12, and FIG. 2 shows a perspective view of the electrodes.
The workpiece 1 in this embodiment is an example of a workpiece manufactured with an aluminum alloy extruded shape made of Japanese Industrial Standard JIS 6063S-T5.
This is an example in which a partial anodizing treatment is performed on the rail portion of the workpiece 1.
A pipe-shaped electrode 11 and an electrode 12 are arranged toward the rail portion of the work 11.
In order to hold the workpiece 1 and the electrodes, a bottom jig 16 and side jigs 13 and 14 are provided.
A power supply is wired between the work 1 and the electrodes 11 and 12, and a voltage is applied.
At this time, the insulators 17a and 17b were appropriately disposed so as not to short-circuit the voltage.
The electrodes 11 and 12 are made of metal pipes, and the nozzles 11b and 11c of the electrolytes 20 and 21 are directed toward the portions of the electrolyte water passages 11a and 12a and the work 1 where partial anodic oxide coatings are to be formed. 12b-12f.
The electrolytic solution ejected from the ejection port toward the surface of the work 1 hits the surface of the work 1, and thereafter is spontaneously discharged downward through the gap 15 between the work 1 and the electrodes 11 and 12.
The distance between the electrodes 11 and 12 and the surface of the workpiece 1 is set in the range of 1 to 30 mm, the hole diameter provided as the injection port is 2 to 10 mm, and the hole pitch in the longitudinal direction shown in FIG. Set.
As the electrolytic solution, an organic acid aqueous solution such as a sulfuric acid aqueous solution, an oxalic acid aqueous solution, or a sulfosalicylic acid aqueous solution is used.
As the electrolysis method, direct current, alternating current, pulse waveform or the like is used.
For example, it sets the range of current density 1~40A / dm 2 in the case of using the aqueous sulfuric acid concentration 100 to 300 g / L.
The higher the current density during the electrolytic treatment, the greater the amount of heat generated, and the injection amount of the electrolytic solution is set to 1.5 liters / min or more per 1 dm 2 for anodizing the workpiece 1.

電解処理条件と陽極酸化皮膜の膜厚のバラツキを実験評価したので説明する。
図３に示すようにワーク１の表面に対して極間距離ｃｍｍになるように電極１１を配置し、電解液を噴射する噴射口の孔径ａｍｍ、孔ピッチｂｍｍ、ワークの１ｄｍ２当たりの噴射量ｄＬ／ｍｉｎとしたときの孔ピッチ間を４等分した部位Ａ〜Ｅの膜厚を測定した。
その時の評価結果を図４の表に示す。
条件ａ〜ｄをそれぞれ管理範囲に設定した実施例１〜３は膜厚差が４μｍ以内であったが管理範囲の一部が外れる比較例４〜６は膜厚差が４．８μｍ以上と大きい結果となった。
このように電解液の噴射口を有する電極をアルミニウム素材の表面に向けて配置することで部分的に陽極酸化皮膜を形成したい部位に向けて電解液を噴射しながら電解処理することができ、従来のような電解槽が不要となる。
自然放流された電解液は回収し、ポンプ等を用いて循環使用できる。
また、図４の結果から複数の噴射口を設けた場合に電解条件を所定の管理範囲内に設定することで、噴射口間の間で膜厚差の小さい均一な陽極酸化皮膜を形成できることが分かる。 The variation in the electrolytic treatment conditions and the thickness of the anodized film was experimentally evaluated and will be described.
As shown in FIG. 3, the electrode 11 is arranged so as to have a distance cmm between the surface of the work 1 and the injection hole is injected with a hole diameter amm, a hole pitch bmm, and an injection amount per 1 dm 2 of the work. The film thicknesses of the parts A to E obtained by dividing the hole pitch into four equal parts with dL / min were measured.
The evaluation results at that time are shown in the table of FIG.
In Examples 1 to 3 in which the conditions a to d were set in the control range, the film thickness difference was within 4 μm, but in Comparative Examples 4 to 6 in which a part of the control range was removed, the film thickness difference was as large as 4.8 μm or more. As a result.
In this way, by arranging the electrode having the electrolytic solution injection port facing the surface of the aluminum material, it is possible to perform the electrolytic treatment while spraying the electrolytic solution toward the part where the anodized film is to be partially formed. Such an electrolytic cell becomes unnecessary.
The electrolyte released naturally can be collected and recycled using a pump or the like.
In addition, when a plurality of injection holes are provided from the results shown in FIG. 4, it is possible to form a uniform anodic oxide film having a small film thickness difference between the injection holes by setting the electrolysis conditions within a predetermined management range. I understand.

１１ 電極
１２ 電極
１２ｆ 噴射口
２０ 電解熱
２１ 電解液 11 Electrode 12 Electrode 12f Injection port 20 Electrolytic heat 21 Electrolytic solution

Claims (1)

押出形材からなるアルミニウム素材の部分的に陽極酸化皮膜を形成したい部位に向けて、電解槽を設けることなく電解液を噴射するための複数の噴射口をアルミニウム素材の長手方向に沿って有するパイプ状の電極を配置し、
前記アルミニウム素材と電極との間には、電圧がショートしないように絶縁体を配置し、
前記複数の噴射口の噴射口ピッチが１００ｍｍ以下で、当該噴射口の孔径は、２〜１０ｍｍであり、
前記電極と、部分的に陽極酸化皮膜を形成するアルミニウム素材表面との極間距離は、１〜３０ｍｍの範囲に設定してあり、
電解条件は、電流密度１〜４０Ａ／ｄｍ ２ ，電解液の噴射量がアルミニウム素材表面積１ｄｍ ２ 当たり１．５リットル／ｍｉｎ以上であり、
前記噴射口からアルミニウム素材に向けて電解液を噴射しながら陽極酸化し、前記アルミニウム素材表面に噴射された電解液は自然放流させたことを特徴とする部分陽極酸化処理方法。 A pipe having a plurality of injection ports along the longitudinal direction of the aluminum material for injecting an electrolytic solution without providing an electrolytic cell toward a part where an anodized film of the extruded aluminum material is to be partially formed. the Jo electrode disposed,
Between the aluminum material and the electrode, an insulator is arranged so that the voltage is not short-circuited,
The nozzle pitch of the plurality of nozzles is 100 mm or less, the hole diameter of the nozzle is 2 to 10 mm ,
The distance between the electrodes and the surface of the aluminum material partially forming the anodized film is set in the range of 1 to 30 mm,
The electrolysis conditions are a current density of 1 to 40 A / dm 2 , an injection amount of the electrolyte is 1.5 liters / min or more per 1 dm 2 of the aluminum material surface area ,
A partial anodizing method characterized in that anodization is performed while spraying an electrolytic solution from an injection port toward an aluminum material, and the electrolytic solution sprayed on the surface of the aluminum material is naturally discharged.
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JP2005314751A (en) * 2004-04-28 2005-11-10 Aisin Keikinzoku Co Ltd Anodizing apparatus and anodizing method
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