JP3202447B2 - Method for forming anodized film on aluminum alloy parts - Google Patents
Method for forming anodized film on aluminum alloy partsInfo
- Publication number
- JP3202447B2 JP3202447B2 JP27202493A JP27202493A JP3202447B2 JP 3202447 B2 JP3202447 B2 JP 3202447B2 JP 27202493 A JP27202493 A JP 27202493A JP 27202493 A JP27202493 A JP 27202493A JP 3202447 B2 JP3202447 B2 JP 3202447B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum alloy
- current
- alloy part
- forming
- oxide film
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミニウム合金部品の
陽極酸化被膜の形成方法および同方法によって酸化被膜
が形成されたアルミニウム合金部品に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an anodic oxide film on an aluminum alloy part and an aluminum alloy part having an oxide film formed by the method.
【０００２】[0002]
【従来の技術】アルミニウム合金に陽極酸化処理を施工
する場合は、一般に電解液中において被処理品を陽極と
し直流電流を流して行われる。この時の直流電流は交流
を整流した直流を用いる。図３は従来の装置において整
流器からアルミニウム合金部品に印加されていた電流の
波形図である。この電流は整流していると言えども、図
に示されるようなノコギリ波を連ねた形の擬似直流であ
る。この直流電流を用いてＡｌ−Ｓｉ系合金鋳物上に陽
極酸化処理を施工した被膜は、膜厚を約２０μｍまで成
形した時に、表面あらさＲmax は８〜１０μｍとなる。
このあらさでは摺動の相手材の摩耗が大きい。摺動を繰
り返して陽極酸化被膜の凸部が摩耗し、いわゆるなじみ
ができるまでには、相手材の摩耗が進行してしまう。2. Description of the Related Art When anodizing is carried out on an aluminum alloy, it is generally carried out by passing a direct current from an object to be treated as an anode in an electrolytic solution. At this time, a direct current obtained by rectifying an alternating current is used. FIG. 3 is a waveform diagram of a current applied from a rectifier to an aluminum alloy part in a conventional device. Although this current is rectified, it is a pseudo direct current in the form of a series of sawtooth waves as shown in the figure. The coating obtained by applying anodizing treatment to the Al-Si alloy casting by using this DC current has a surface roughness Rmax of 8 to 10 µm when formed to a thickness of about 20 µm.
With this roughness, the wear of the sliding partner material is large. By repeated sliding, the convex portion of the anodic oxide film is worn, so that the mating material is worn by the time the so-called conformity is achieved.
【０００３】[0003]
【発明が解決しようとする課題】陽極酸化処理は電気化
学反応を利用した被膜の形成であり、そこには電流の性
質が大きく影響する。特にＳｉが粒状となって存在する
Ａｌ−Ｓｉ系鋳物合金への処理は、Ｓｉ粒が電流を阻害
するため被膜が形成されにくく、Ｓｉが密集している部
位は目標膜厚よりも薄くなりやすい。このため被膜の凹
凸が激しくなり、表面あらさは大となる。この原因の一
つには前述のノコギリ波状の電流（図３）が考えられ
る。ミクロ的な電流、電圧の変動があるため、Ｓｉ粒の
密集部へ電流が流れにくく、Ｓｉ粒の存在しない部位は
電流が流れやすい傾向が生じる。そこでＳｉ粒密集部に
おいてもＳｉ粒が存在しない部位においても均一な電気
化学反応を生じさせるよう変動のない電流を使用する必
要がある。The anodic oxidation treatment is the formation of a film utilizing an electrochemical reaction, and the nature of the current greatly affects the formation of the film. In particular, in the treatment of an Al-Si based casting alloy in which Si is present in a granular state, a film is difficult to be formed because the Si particles hinder the current, and a portion where Si is densely formed tends to be thinner than the target film thickness. . For this reason, the unevenness of the coating becomes severe, and the surface roughness becomes large. One of the causes is considered to be the above-mentioned sawtooth current (FIG. 3). Since there is a microscopic variation in current and voltage, current hardly flows to the dense portion of Si grains, and the current tends to easily flow in a portion where no Si grains exist. Therefore, it is necessary to use a current that does not fluctuate so as to generate a uniform electrochemical reaction even in the Si grain dense portion and in a portion where no Si grain exists.
【０００４】本発明は、アルミニウム合金部品の全表面
に均一な電気化学反応を生じさせて表面あらさを小さく
するようにした陽極酸化被膜形成方法および同方法によ
って被膜を形成したアルミニウム合金部品を提供しよう
とするものである。An object of the present invention is to provide an anodized film forming method in which a uniform electrochemical reaction is caused on the entire surface of an aluminum alloy part to reduce the surface roughness, and an aluminum alloy part formed by the method. It is assumed that.
【０００５】[0005]
【課題を解決するための手段】本発明は上記課題を解決
したものであって、次の特徴を有する方法あるいは部品
である。 （１）交流電流を整流した直流電流を電解液に浸されて
いる処理対象のアルミニウム合金部品に印加し、その表
面に陽極酸化被膜を形成するアルミニウム合金部品の陽
極酸化被膜形成方法において、前記直流電流を更にリッ
プル補正した後、前記アルミニウム合金部品に印加する
ことを特徴とするアルミニウム合金部品の陽極酸化被膜
形成方法。 （２）前記（１）項に記載のアルミニウム合金部品の陽
極酸化被膜形成方法において、処理対象のアルミニウム
合金部品がスクロール型流体機械に用いられるスクロー
ル部材であることを特徴とするアルミニウム合金部品の
陽極酸化被膜形成方法。 （３）交流電流を直流電流に整流し、さらに、この直流
電流をリップル補正した直流電流を印加して陽極酸化被
膜を形成したことを特徴とするアルミニウム合金部品。 （４）前記（３）項に記載のアルミニウム合金部品が、
Ａｌ−Ｓｉ合金であることを特徴とするアルミニウム合
金部品。 （５）前記（３）項に記載のアルミニウム合金部品が、
スクロール型流体機械に用いられるスクロール部材であ
ることを特徴とするアルミニウム合金部品。SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems, and is a method or a component having the following features. (1) A method for forming an anodic oxide film on an aluminum alloy component in which an alternating current is rectified and a direct current is applied to an aluminum alloy component to be treated which is immersed in an electrolytic solution to form an anodic oxide film on the surface thereof. A method for forming an anodic oxide film on an aluminum alloy component, further comprising applying a current to the aluminum alloy component after ripple correction. (2) In the method for forming an anodic oxide film on an aluminum alloy part according to the above (1), the aluminum alloy part to be treated is a scroll member used in a scroll type fluid machine, and the anode of the aluminum alloy part is characterized in that: Method for forming oxide film. (3) An aluminum alloy component comprising an anodic oxide film formed by rectifying an alternating current into a direct current and applying a direct current in which the direct current has been ripple-corrected. (4) The aluminum alloy part according to the above (3),
An aluminum alloy part characterized by being an Al-Si alloy. (5) The aluminum alloy part according to the above (3),
An aluminum alloy part, which is a scroll member used for a scroll type fluid machine.
【０００６】[0006]
【作用】リップル補正器を用いることにより、電流波形
は図２に示すような平坦な形となり、この電流によって
陽極酸化処理を施工すれば、従来ノコギリ波状の電流に
よって生じていた粗面が解消され、平滑な陽極酸化被膜
が得られる。By using the ripple corrector, the current waveform becomes a flat shape as shown in FIG. 2. If the anodic oxidation treatment is performed by using this current, the rough surface which has been caused by the sawtooth-shaped current is eliminated. A smooth anodic oxide film is obtained.
【０００７】[0007]
【実施例】図１は本発明の一実施例に係る陽極酸化被膜
形成装置の系統図である。図において、３は陽極酸化処
理槽、４は同処理槽に満されている電解液、２は同電解
液中に設けられている陰極板、１は同電解液中に吊り下
げられている被処理物、５は処理槽底部に設けられてい
るエア散気管、６は前記陰極板２と被処理物１へ電流を
供給する整流器、７は同整流器６の陽極と被処理物１と
の間の回路に挿入されているリップル補正器である。FIG. 1 is a system diagram of an anodic oxide film forming apparatus according to one embodiment of the present invention. In the figure, 3 is an anodizing tank, 4 is an electrolytic solution filled in the tank, 2 is a cathode plate provided in the electrolytic solution, and 1 is a substrate suspended in the electrolytic solution. The processing object, 5 is an air diffuser provided at the bottom of the processing tank, 6 is a rectifier for supplying current to the cathode plate 2 and the processing object 1, and 7 is between the anode of the rectifier 6 and the processing object 1. Is a ripple corrector inserted in the circuit of FIG.
【０００８】上記装置を用いて、スクロール圧縮機用の
アルミニウム合金製スクロールに酸化被膜を形成する工
程の例について述べる。機械加工を終えたＡｌ−Ｓｉ系
合金鋳物でできたスクロールについて、前処理として脱
脂液（市販の中性脱脂剤）中にて表面の油分を除去した
後、陽極酸化処理槽３にて処理を行なう。この時、処理
槽３の中は電解液として硫酸３３０g/l 、アルミイオン
として２g/l を含む水溶液を用い、この液温は常時４℃
に設定し、液の攪拌にエア散気管５から吹き出すエアに
て行う。被処理物１をＴｉ製の治具で固定し、対極とし
て鉛板を処理槽中に設置し、被処理物１を陽極（＋）側
に、対極を陰極（−）側となるよう配線し、上記電解液
４中にて被処理物１と対極間に電流密度が３Ａ／dm2 と
なるように電流を印加し２４分の電解処理を行なう。従
来方法では、電解時には整流器６から直接配線し通電を
行っていたが、本実施例では前記問題点を解決するため
に整流器６と被処理物１の間にノコギリ波状の電流波形
を直線状にする効果を持つリップル補正器７を設置して
リップル補正し処理を実施する。電圧は、初期は約２０
Ｖで時間の経過と共に上昇し２４分後には約４０Ｖとな
る。図２は上記リップル補正を行った後の電流波形図で
ある。An example of a process for forming an oxide film on an aluminum alloy scroll for a scroll compressor using the above-described apparatus will be described. As for the scroll made of the Al-Si alloy casting after the machining, the surface oil is removed in a degreasing solution (a commercially available neutral degreasing agent) as a pretreatment, and then the treatment is performed in the anodizing tank 3. Do. At this time, an aqueous solution containing 330 g / l of sulfuric acid as an electrolytic solution and 2 g / l as an aluminum ion was used in the treatment tank 3, and the temperature of the solution was always 4 ° C.
, And the liquid is stirred with air blown out from the air diffuser 5. The object 1 is fixed with a jig made of Ti, a lead plate is placed in a processing tank as a counter electrode, and the object 1 is wired to the anode (+) side and the counter electrode is connected to the cathode (−) side. Then, a current is applied in the electrolytic solution 4 between the object 1 and the counter electrode so that the current density becomes 3 A / dm 2, and the electrolytic treatment is performed for 24 minutes. In the conventional method, during the electrolysis, the current is supplied by direct wiring from the rectifier 6, but in the present embodiment, in order to solve the above-mentioned problem, the sawtooth-shaped current waveform is linearly formed between the rectifier 6 and the object 1 to be processed. A ripple corrector 7 having the effect of performing the above is installed to perform the ripple correction processing. The voltage is initially about 20
It rises with the passage of time at V and becomes about 40 V after 24 minutes. FIG. 2 is a current waveform diagram after the ripple correction is performed.
【０００９】電解処理終了後は、被処理物１は水洗によ
って電解液４を洗い落とし水分除去のため乾燥させる。
この結果、陽極酸化被膜が約２０μｍの厚さに形成さ
れ、表面あらさＲmax は４〜５μｍと従来方法に比べ約
半分のあらさまで変化し平滑な表面が得られる。表面あ
らさＲmax が４〜５μｍ程度に小さい場合には、一般に
相手材の摩耗は極めて小さくなることは、試験によって
確かめられている。したがって、上記被処理物１は、相
手材の摩耗を減少させることができる。After completion of the electrolytic treatment, the object 1 is washed with water to remove the electrolytic solution 4 and dried to remove water.
As a result, an anodic oxide film is formed to a thickness of about 20 μm, and the surface roughness Rmax changes to about 4 to 5 μm, which is about half that of the conventional method, and a smooth surface is obtained. Tests have shown that when the surface roughness Rmax is as small as about 4 to 5 .mu.m, the wear of the mating material generally becomes extremely small. Therefore, the object 1 can reduce the wear of the mating material.
【００１０】[0010]
【発明の効果】本発明のアルミニウム合金部品の陽極酸
化被膜形成方法は、交流電流を整流した直流電流を更に
リップル補正した後、前記アルミニウム合金部品に印加
することを特徴とする方法であり、この方法はスクロー
ル型流体機械のスクロール部材に対しても適用される。
また本発明のアルミニウム合金部品は交流電流を直流電
流に整流し、さらに、この直流電流をリップル補正した
直流電流を印加して陽極酸化被膜が形成されたものであ
り、同合金部品はＡｌ−Ｓｉ合金であり、あるいはスク
ロール型流体機械に用いられるスクロール部材である。The method of forming an anodic oxide film on an aluminum alloy part according to the present invention is characterized in that a DC current obtained by rectifying an AC current is further subjected to ripple correction and then applied to the aluminum alloy part. The method is also applied to a scroll member of a scroll type fluid machine.
Further, the aluminum alloy part of the present invention has an anodic oxide film formed by rectifying an alternating current to a direct current and applying a direct current obtained by correcting the direct current by ripples. It is an alloy or a scroll member used in a scroll type fluid machine.
【００１１】したがって、アルミニウム合金部品の全表
面に均一な電気化学反応を生じさせて、表面あらさを小
さくすることができ、また表面あらさの小さいアルミニ
ウム合金部品を提供することができるので、摺動相手
材、特にスクロール部材等の摩耗を減少させることがで
きる。Therefore, a uniform electrochemical reaction is caused on the entire surface of the aluminum alloy part to reduce the surface roughness, and it is possible to provide an aluminum alloy part having a small surface roughness. The wear of the material, especially the scroll member, etc. can be reduced.
【図１】本発明の一実施例に係る陽極酸化被膜形成装置
の系統図。FIG. 1 is a system diagram of an anodic oxide film forming apparatus according to one embodiment of the present invention.
【図２】上記実施例の装置においてリップル補正を経た
後アルミニウム部品に印加される電流のオシロ波形の写
真。FIG. 2 is a photograph of an oscilloscope waveform of a current applied to an aluminum component after a ripple correction in the apparatus of the above embodiment.
True .
【図３】従来の装置において整流器からアルミニウム合
金部品に印加されていた電流のオシロ波形の写真。FIG. 3 is a photograph of an oscilloscope waveform of a current applied from a rectifier to an aluminum alloy part in a conventional device.
１ 被処理物 ２ 陰極板 ３ 陽極酸化処理槽 ４ 電解液 ５ エア散気管 ６ 整流器 ７ リップル補正器 DESCRIPTION OF SYMBOLS 1 Processing object 2 Cathode plate 3 Anodizing tank 4 Electrolyte 5 Air diffuser 6 Rectifier 7 Ripple corrector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 泰之 名古屋市名東区本郷２丁目160番ＩＥＣ ビル３Ｆ ＮＴＣ株式会社内 (56)参考文献 特開 平４−259400（ＪＰ，Ａ) 特開 平６−328876（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C25D 11/00 - 11/24 F04C 18/02 311 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuyuki Kato 2-160 Hongo, Meito-ku, Nagoya IEC Building 3F NTC Corporation (56) References JP-A-4-259400 (JP, A) JP-A-6 -328876 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C25D 11/00-11/24 F04C 18/02 311
Claims (5)
浸されている処理対象のアルミニウム合金部品に印加
し、その表面に陽極酸化被膜を形成するアルミニウム合
金部品の陽極酸化被膜形成方法において、前記直流電流
を更にリップル補正した後、前記アルミニウム合金部品
に印加することを特徴とするアルミニウム合金部品の陽
極酸化被膜形成方法。1. A method for forming an anodized film on an aluminum alloy part, comprising applying a direct current obtained by rectifying an alternating current to an aluminum alloy part to be treated which is immersed in an electrolytic solution and forming an anodized film on the surface thereof. A method of forming an anodic oxide film on an aluminum alloy component, wherein the DC current is further subjected to ripple correction and then applied to the aluminum alloy component.
の陽極酸化被膜形成方法において、処理対象のアルミニ
ウム合金部品がスクロール型流体機械に用いられるスク
ロール部材であることを特徴とするアルミニウム合金部
品の陽極酸化被膜形成方法。2. The anode of an aluminum alloy part according to claim 1, wherein the aluminum alloy part to be treated is a scroll member used in a scroll type fluid machine. Method for forming oxide film.
この直流電流をリップル補正した直流電流を印加して陽
極酸化被膜を形成したことを特徴とするアルミニウム合
金部品。3. An AC current is rectified into a DC current, and
An aluminum alloy component wherein an anodized film is formed by applying a DC current obtained by ripple-correcting the DC current.
が、Ａｌ−Ｓｉ合金であることを特徴とするアルミニウ
ム合金部品。4. The aluminum alloy part according to claim 3, wherein the aluminum alloy part is an Al—Si alloy.
が、スクロール型流体機械に用いられるスクロール部材
であることを特徴とするアルミニウム合金部品。5. The aluminum alloy part according to claim 3, wherein the aluminum alloy part is a scroll member used for a scroll type fluid machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27202493A JP3202447B2 (en) | 1993-10-29 | 1993-10-29 | Method for forming anodized film on aluminum alloy parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27202493A JP3202447B2 (en) | 1993-10-29 | 1993-10-29 | Method for forming anodized film on aluminum alloy parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07126891A JPH07126891A (en) | 1995-05-16 |
| JP3202447B2 true JP3202447B2 (en) | 2001-08-27 |
Family
ID=17508070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27202493A Expired - Lifetime JP3202447B2 (en) | 1993-10-29 | 1993-10-29 | Method for forming anodized film on aluminum alloy parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3202447B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3696299A1 (en) * | 2019-02-15 | 2020-08-19 | Coventya GmbH | Method for producing a corrosion-resistant aluminum-silicon alloy casting, corresponding corrosion-resistant aluminum-silicon alloy casting and its use |
-
1993
- 1993-10-29 JP JP27202493A patent/JP3202447B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07126891A (en) | 1995-05-16 |
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