JPS6123793A - Surface treatment of aluminum - Google Patents

Abstract

PURPOSE:To give excellent scratch resistance on the aluminum surface by degreasing the aluminum surface, performing spray work with the abrasive particles of specified particle sizes and thereafter forming an anodized film of specified thickness thereon. CONSTITUTION:After degreasing the surface of aluminum or aluminum alloy plate, the abrasive material (glass bead or the like) of 20-400 mesh particle size is blown onto the aluminum plate together with water in about 1-5kg/cm<2> pressure from a nozzle positioned at about 50-200mm. distance apart therefrom to perform satin working by which the fine unevennesses are generated on the surface of aluminum plate. The honed surface of aluminum is etched with alkali or the like to remove the oxide layers and to make the surface to the uniform activated state and the generated mud is dissolved by about 10% nitric acid soln. and removed therefrom. Then, the aluminum plate is immersed into about 15% sulfuric acid soln. or the mixed soln. of sulfuric acid and oxalic acid and treated in 8- 20V electrolytic voltage for 15-90min electrolytic time to form the anodized film of 15-100mu thickness of the aluminum surface.

Description

Translated fromJapanese

【発明の詳細な説明】〔産業上の利用分野〕本発明はアルミニウムまたはアルミニウム合金等のため
に、装置表面に取付けられる銘板として用いられるアル
ミニウム板の表面処理に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to surface treatment of aluminum plates used as nameplates attached to the surface of equipment, such as aluminum or aluminum alloys.

〔従来の技術〕[Conventional technology]

従来より、公衆電話機、自動販売機などにはアルミニウ
ムまたはその合金の板の表面に、陽極醸化皮膜を生成し
、梁間によって文字、図形などを形成した銘板が用いら
れている。このような銘板では、地色としての銀白色を
損なわないよう、陽極酸化皮膜の生成は厚さ６μｍ程度
にとどめているために傷つき易く、例えば公衆電話機な
どでは、硬貨による損傷は酸化皮膜だけでなく、板その
ものにまで及び、設置して数ケ月後には文字、図形の読
取りが不可能になったり、銘板が破損したりして見苦し
い状態になる例が多い。このため、地金を厚くして、陽
極酸化皮膜を３０〜６０μｍの厚さに生成させた、いわ
ゆる硬質アルマイトを用いることも試みられている。BACKGROUND ART Conventionally, public telephones, vending machines, etc. have used nameplates in which an anodic coating is formed on the surface of an aluminum or aluminum alloy plate, and letters, figures, etc. are formed between the beams. Such nameplates are easily damaged because the anodic oxide film is limited to a thickness of about 6 μm in order not to spoil the silvery white background color.For example, in public telephones, coins can only damage the oxide film. This extends to the board itself, and in many cases, several months after installation, the letters and graphics become illegible, and the nameplate becomes damaged and unsightly. For this reason, attempts have been made to use so-called hard alumite, which is made of a thicker base metal and has an anodic oxide film formed to a thickness of 30 to 60 μm.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、陽極酸化皮膜を厚く生成させるには高電
圧を加えたり、あるいは長時間アルマイト処理液に浸漬
する必要があり、酸化皮膜に［焼け、１や「荒れ］を生
じ易く、銘板表面が暗灰色または灰黒色に変色し、文字
、図形等を染色してもコントラストがとれず、不鮮明で
読取りにくかったり、染色が黒ずんで色の鮮やかさが著
しく損なわれ、所望の色が得られないという欠点がある
。However, in order to create a thick anodic oxide film, it is necessary to apply high voltage or to immerse the alumite in the alumite treatment solution for a long time, which tends to cause the oxide film to become burnt, 1 or "rough", resulting in a dark gray nameplate surface. Otherwise, the color changes to a gray-black color, and even if letters, figures, etc. are dyed, there is no contrast, making them unclear and difficult to read, or the dyeing darkens and the vividness of the color is significantly impaired, making it impossible to obtain the desired color. be.

また、厚い酸化皮膜はクラックが入り易く、一方酸化皮
膜を厚くすることによって表面の微細孔が減少して染料
の吸着量が少なくなり、日光に曝されると文字、図形等
の染色面が容易に変退色して判読できなくなるなどの不
都合があり、実用化にはまだ問題がある。In addition, a thick oxide film is prone to cracks, and on the other hand, by making the oxide film thicker, the micropores on the surface are reduced and the amount of dye adsorption is reduced, making it easy for letters, figures, etc. to stain surfaces when exposed to sunlight. However, there are still problems with practical use, such as discoloration and fading, making it unreadable.

本発明はこのようなアルミニウム表面の陽極酸化皮膜に
ついての染色性と表面硬度についての相反する要望を満
足し、硬貨等による損傷を受けに＜＜、かつ、「焼け」
や「荒れ」の生じにくい陽極酸化皮膜を生成せしめる、
アルミニウムお表面処理方法を提供するものである。The present invention satisfies the conflicting demands regarding dyeability and surface hardness of the anodic oxide film on the aluminum surface, is resistant to damage by coins, etc., and is resistant to "scorch".
Produces an anodic oxide film that is less likely to cause roughness or roughness.
This provides an aluminum surface treatment method.

〔問題点を解決するため。の手段〕[To solve problems. means]

本発明は、アルミニウムまたはアルミニウム合金の表面
を陽極酸化処理する方法において、前記表面を脱脂した
後、２０〜４００メツシュの研磨材粒子を前記表面に吹
きつける加工を行い、次いで陽極酸化皮膜を１５〜１０
０μｍの厚さで生成せしめることを特徴とするアルミニ
ウムの表面処理方法である。The present invention provides a method for anodizing the surface of aluminum or aluminum alloy, in which after the surface is degreased, abrasive particles of 20 to 400 mesh are sprayed onto the surface, and then an anodized film of 15 to 400 mesh is sprayed onto the surface. 10
This is a method for surface treatment of aluminum, characterized in that aluminum is produced with a thickness of 0 μm.

本発明において、陽極酸化皮膜を生成せしめる材質はア
ルミニウムまたはアルミニウム合金で、通常酸化皮膜に
よる色変化の少ない純アルミニウムが用いられるが、材
質としての硬度の点からはマクネシウムを２〜５％含有
する耐食アルミニラ′（ム合金が好ましい。In the present invention, the material that generates the anodic oxide film is aluminum or aluminum alloy, and pure aluminum, which has little color change due to the oxide film, is normally used, but from the viewpoint of hardness, corrosion-resistant material containing 2 to 5% manesium is used. Aluminum alloy is preferred.

本発明で処理されるアルミニウム素材の形状は任意で、
通常、銘板に用いる場合は所望の厚みの板が用いられる
が、耐傷性が要求される外装部材で、以下に述べるホー
ニング加工が可能なものであれば、任意の形状に成形さ
れたものが用い得る。The shape of the aluminum material processed in the present invention is arbitrary,
Normally, when used as a nameplate, a plate of the desired thickness is used, but for exterior parts that require scratch resistance and can be honed as described below, plates molded into any shape can be used. obtain.

以下の説明においては銘板を対象として説明する。In the following explanation, a nameplate will be explained.

アルミニウムまたはアルミニウム合金の板（以下アルミ
ニウム板あるいは単に板という）を脱脂して、板表面に
付着した油脂分を除いた後、タイラー標準ふるいで２０
＝４００メツシュの間に入る所望の粒度の研磨材を板の
表面に吹きつけるホーニング処理により、板表面に梨地
加工を行う。After degreasing an aluminum or aluminum alloy plate (hereinafter referred to as an aluminum plate or simply plate) to remove oil and fat adhering to the plate surface, sieve it with a Tyler standard sieve for 20 minutes.
A satin finish is applied to the surface of the board by a honing process in which an abrasive with a desired particle size falling between =400 mesh is sprayed onto the surface of the board.

用いる研磨材は通常ガラスビーズが用いられるが、珪？
、コランダム等の天然はしくは人造の研磨材粒子を用い
てもよい。ホーニング加工は研磨材を水と共に１〜５　
ｋｇ　／　ｃＪの圧力で、アルミニウム板上に約５０〜
２００ｍｍの距離においたノズルより吹きつけ、アルミ
ニウム板表面に微細な凹凸を生せしめる。The abrasive material used is usually glass beads, but silicon?
Natural or artificial abrasive particles such as corundum or the like may also be used. For honing, use abrasive material with water from 1 to 5
Approximately 50~ on an aluminum plate at a pressure of kg/cJ
It is sprayed from a nozzle placed at a distance of 200 mm to create fine irregularities on the surface of the aluminum plate.

ホーニング加工された表面は、苛性アルカリなどにより
エツチングして、表面の酸化皮膜などを除去し、表面を
均一な活性状態とし、生成したスマットを１０％硝酸溶
液で溶解除去し、次の陽極酸化処理を行う。The honed surface is etched with caustic alkali etc. to remove the oxide film on the surface, make the surface uniform and active, remove the generated smut by dissolving it with a 10% nitric acid solution, and then perform the next anodizing treatment. I do.

陽極酸化は、電解液として１５％の硫酸溶液または硫酸
とシュウ酸の混合溶液中に板を浸漬し、電解電圧８〜２
０Ｖ、電解時間１５〜９０分で、板の表面に１５〜２５
１１ｍの厚さの陽極酸化皮膜を生成させる。陽極酸化皮
膜を生成させる方法としては、上記の通常のアルマイト
処理の他に、電解電圧を２２〜２６Ｖの高電圧と１５〜
１８Ｖの低電圧とを交互に短形波状電圧で６０〜９０秒
の周期で印加するパルスアルマイト処理を適用すること
ができ、このパルスアルマイト処理は「焼け」や「荒れ
」の発生がなく、酸化皮膜の変色が少ないので染色が鮮
明であり、かつ、皮膜硬度が高いので、本発明の処理方
法の陽極酸化に特に有利に適用される。For anodizing, the plate is immersed in a 15% sulfuric acid solution or a mixed solution of sulfuric acid and oxalic acid as an electrolytic solution, and an electrolytic voltage of 8 to 2
0V, electrolysis time 15-90 minutes, 15-25% on the surface of the plate
An anodic oxide film with a thickness of 11 m is produced. In addition to the above-mentioned normal alumite treatment, the method for producing an anodic oxide film is to apply an electrolytic voltage of 22 to 26 V and a high voltage of 15 to 26 V.
Pulse alumite treatment can be applied in which a low voltage of 18V is applied alternately with a rectangular waveform voltage at a cycle of 60 to 90 seconds.This pulse alumite treatment does not cause "burn" or "roughness" and is free from oxidation. Since there is little discoloration of the coating, the dyeing is clear, and the coating has high hardness, it is particularly advantageously applied to the anodic oxidation of the treatment method of the present invention.

〔作用および効果〕[Action and effect]

本発明の方法において、陽極酸化処理に先立って予めア
ルミニウム板の表面をホーニング処理することにより、
酸化皮膜に優れた耐傷性が付与される理由は必ずしも明
らかではないが、ホーニング処理に用いる研磨材の粒子
の大きさが、得られる酸化皮膜の耐傷性に関係し、２０
〜４００メツシュの範囲のものが用いられる。２０メツ
シュ以下の大粒子を用いた場合、板表面の「荒れ、」が
激しく、耐傷性が低下すると共に、染色に際してのレジ
ストの印刷性が悪く、解像力が低下して鮮明な文字、図
形の表現が困難になる。また、４００メツシュ以上の微
細粒子によるホーニング処理では、処理効果が得られず
、酸化皮膜の耐傷性は急激に低下する。このことは以下
の硬貨による耐傷性試験結果により示される。In the method of the present invention, by honing the surface of the aluminum plate in advance prior to anodizing treatment,
The reason why the oxide film has excellent scratch resistance is not necessarily clear, but the size of the particles of the abrasive used in the honing process is related to the scratch resistance of the resulting oxide film.
-400 meshes are used. If large particles of 20 mesh or less are used, the surface of the board will be severely roughened and scratch resistance will be reduced, and the printability of the resist during dyeing will be poor and resolution will be reduced, making it difficult to express clear letters and figures. becomes difficult. Further, in honing treatment using fine particles of 400 mesh or more, no treatment effect is obtained, and the scratch resistance of the oxide film sharply decreases. This is shown by the following scratch resistance test results using coins.

第３図は硬貨耐傷性試験機の概要を示し、一定荷重（５
ｋｇ）でコイン２に押付けられた試料板６を矢印の方向
に引抜くと、試料板の酸化皮膜表面がコイン２のエツジ
で引掻かれる。第１表に示す６種の硬さの異なる材質を
用いたコインを使用し、第４図に示す損傷状態に応じて
、酸化皮膜４に傷の全くつかない状態を０とし、酸化皮
膜がコインですべて損傷を受けて剥離し、地金５まで損
傷した状態を４とし、その間を３レベルに分けて損傷度
とした。６種のコインによる損傷度を合計して皮膜損傷
度を表わした。Figure 3 shows an overview of the coin scratch resistance tester, and shows a constant load (5
When the sample plate 6 pressed against the coin 2 (kg) is pulled out in the direction of the arrow, the surface of the oxide film on the sample plate is scratched by the edge of the coin 2. Using coins made of the six types of materials with different hardness shown in Table 1, the state of no scratches on the oxide film 4 is defined as 0, and the state of no scratches on the oxide film 4 is determined according to the damage state shown in Figure 4. The state in which all of the parts were damaged and peeled off, and the base metal was damaged up to 5 was rated 4, and the damage level was divided into 3 levels. The degree of damage to the film was expressed by summing up the degree of damage caused by the six types of coins.

第１表純アルミニウム（Ａ　Ｉ　Ｏ５０）とＡｌ−Ｍｇ耐食ア
ルミ合金（Ａ５０５２）について、ホーニング加工に用
いたガラスビーズのメツシュとそれに陽極酸化皮膜を２
０μｍ生成せしめた。試料板に上記硬　　　　□貨耐傷
試験を行った結果を第１図に示す。ホーニング加工に用
いたガラスビーズが２０〜４００メツシュの間にあると
き、陽極酸化皮膜の耐傷性は明らかに優れており、特に
耐食アルミ合金Ａ３０５２を基板に用いたときには全く
損傷を受けないという効果が認められる。Table 1 Regarding pure aluminum (A I O50) and Al-Mg corrosion-resistant aluminum alloy (A5052), the mesh of glass beads used for honing and the anodized coating were
0 μm was generated. Figure 1 shows the results of the above-mentioned hard currency scratch resistance test performed on the sample plate. When the glass beads used for honing are between 20 and 400 mesh, the scratch resistance of the anodic oxide film is clearly excellent, and especially when the corrosion-resistant aluminum alloy A3052 is used as the substrate, there is no damage at all. Is recognized.

第１０図ないし第起図は本発明を適用した白抜き染色文
字がある銘板に対して耐傷性試験を行った後の試料板の
状態を約１０倍に拡大した写真を示したもので、第１０
図は純アルミ板（Ａ　１０５０）をホーニング加工なし
で２０μｍの陽極酸化皮膜を生成せしめたものを第１表
Ｎ０８６の浸炭焼入鋼で引掻いた状況を示し、第４図に
示す損傷度で２と４との間、即ち３の損傷度が認められ
る。第１１図は８０メツシュのガラスビーズでホーニン
グ加工し、同様に２０μｍの陽極酸化皮膜を生成せしめ
たもので、第１０図と同じ（Ｎｏ、　６の浸炭焼入鋼に
よる引掻きによって浸炭焼入鋼の磨耗粉がついているが
、文字の損傷は全くない。第１２図は第１１図の磨耗粉
を−拭きしさ後の写真で、文字および染色面は全く損傷
を受けておらず、損傷度は０である。Figures 10 through 10 are photographs showing the condition of the sample plate after a scratch resistance test was conducted on a name plate with white colored characters to which the present invention is applied, enlarged approximately 10 times. 10
The figure shows a state in which a pure aluminum plate (A 1050) with a 20 μm anodic oxide film formed without honing was scratched with carburized and hardened steel of Table 1 N086, with the degree of damage shown in Figure 4. A degree of damage between 2 and 4, ie 3, is observed. Figure 11 shows a case in which honing was performed using 80-mesh glass beads to form a 20 μm anodic oxide film. There is abrasion powder, but there is no damage to the letters. Figure 12 is a photo of the abrasion powder in Figure 11 after wiping. The letters and dyed surface are not damaged at all, and the degree of damage is 0. It is.

耐食アルミ合金Ａ３０５２を用い、２３０メツシュのガ
ラスビーズによるホーニング加工で梨地処理した表面と
、梨地処理しない表面に陽極酸化皮膜を生成せしめ、そ
の皮膜厚さを変化させた場合の硬貨耐傷試験結果を第２
表に示す。陽極酸化皮膜の厚さが増すと共に皮膜損傷度
は低下するが、ホーニング加工による梨地面では、酸化
皮膜の厚さと共に損傷度は急激に低下し、皮膜の厚さが
１７μｍ以上では全く損傷を受けない。ただし、陽極酸
化皮膜の厚さが２５μｍを超えると、皮膜の色が灰色か
ら灰黒色へと変化し、表面の荒れが目立ち、３０μｍ以
上ではクラックが発生し始め、染色の色彩が損なわれ、
文字、図形のコントラストが低下する。Using corrosion-resistant aluminum alloy A3052, anodic oxide films were formed on the surface treated with a satin finish by honing with 230 mesh glass beads and on the surface without the satin finish treatment, and the results of a coin scratch resistance test were conducted when the thickness of the film was varied. 2
Shown in the table. The degree of damage to the anodized film decreases as the thickness of the anodic oxide film increases, but on a pear-finished surface created by honing, the degree of damage rapidly decreases as the thickness of the oxide film increases, and when the thickness of the film is 17 μm or more, no damage occurs at all. do not have. However, when the thickness of the anodic oxide film exceeds 25 μm, the color of the film changes from gray to gray-black, and the surface roughness becomes noticeable, and when the thickness exceeds 30 μm, cracks begin to occur and the color of the dyeing is impaired.
The contrast of text and graphics decreases.

本発明の表面処理方法で得られた陽極酸化皮膜は、上記
したように優れた耐傷性を有し、単にコインによる損傷
を防ぐのみならずナイフェツジやドライバーに相当する
浸炭焼入＃（第１表Ｎ０．６）に対してすら耐傷性を有
する。従って機器に取付けられる銘板の染色された文字
、図形の損傷を防ぐのに有効である他、熱硬化性樹脂等
の保護皮膜を与えて耐候性を強化した外装材のアルマイ
ト層に適用することにより、更に耐傷性を高めることが
できる。また、テフロン等の保護皮膜を与えて潤滑性、
耐磨耗性を強化した軸及び軸受け、その他摺動部材に適
用して、更に耐傷性を高めることができる。このよ゛う
な目的のために本発明を適用する場合には陽極酸化皮膜
の厚さを銘板の場合より厚く、例えば２５〜１００／１
ｍに設定することが望ましい。The anodized film obtained by the surface treatment method of the present invention has excellent scratch resistance as described above, and not only prevents damage caused by coins but also carburized and quenched # (Table 1), which is equivalent to knives and screwdrivers. It has scratch resistance even against N0.6). Therefore, it is effective in preventing damage to the dyed letters and figures on nameplates attached to equipment, and by applying a protective film such as thermosetting resin to the alumite layer of exterior materials to strengthen weather resistance. , it is possible to further improve scratch resistance. In addition, a protective film such as Teflon is added to improve lubricity and
It can be applied to shafts and bearings with enhanced wear resistance, and other sliding members to further increase scratch resistance. When applying the present invention for such a purpose, the thickness of the anodic oxide film should be thicker than that of a nameplate, for example, 25 to 100/1.
It is desirable to set it to m.

〔実施例〕〔Example〕

以下の実施例においては、陽極酸化皮膜の強さを硬貨磨
耗試験によって示す。第５図は硬貨磨耗試験の概要を示
すもので、リン青銅（ｃ　５１９１Ｂ−Ｈ）のコイン６
を試料板ろに４５°の角度で当て、荷重７（５００ｇ）
をかけてから、試料板６を往復させ、往復摩擦１０００
回まで行った場合のコイン乙の磨耗量（重量減、ｍｇ）
を測定する。In the following examples, the strength of the anodic oxide film is demonstrated by a coin abrasion test. Figure 5 shows the outline of the coin abrasion test.
Apply it to the sample plate at an angle of 45°, and apply a load of 7 (500 g).
is applied, the sample plate 6 is reciprocated, and the reciprocating friction is
Amount of wear on coin O (weight loss, mg) when used up to 1 times
Measure.

実施例１厚さ２ｍｍの純アルミ板（Ａ　１０５０）をそれぞれ８
０メツシュおよび２４０メツシュのガラスビーズでウェ
ットホーニングしたものを、１５Ｗ／Ｖ％硫酸溶液中で
１２Ｖの電圧で６０分間陽極酸化処理し、酸化皮膜を生
成せしめた。生成皮膜の厚さは２３〜２６μｍであった
。比較のためホーニング処理を行わないものを同一電解
槽で陽極酸化皮膜を生成せしめ、３種の試料につき硬貨
磨耗試験を行った。結果は第６図に示す。ホーニング加
工された板では、ホーニング加工されない板に比較して
コインが著しく磨耗し、フィン重量が減少している。ホ
ーニング加工された面はヤスリのようになってコインの
エッヂを粉化し、全く損傷を受けず、付着したコインの
粉末は軽く拭きとることにより簡単に除去できた。一方
、ホーニング加工されていない面ではコインのエッヂて
こずられた跡がつき、拭き取りによっても除去できなか
った。Example 1 8 pure aluminum plates (A 1050) each having a thickness of 2 mm
Wet-honed glass beads with 0 mesh and 240 mesh were anodized in a 15 W/V% sulfuric acid solution at a voltage of 12 V for 60 minutes to form an oxide film. The thickness of the resulting film was 23-26 μm. For comparison, anodic oxide films were formed on samples without honing in the same electrolytic bath, and a coin abrasion test was conducted on three types of samples. The results are shown in Figure 6. The honed board has significantly more coin wear and reduced fin weight than the unhoned board. The honed surface acted like a file and pulverized the edges of the coin, leaving them completely undamaged, and any adhering coin powder could be easily removed by wiping it off. On the other hand, on the non-honed surface, there were marks from the edges of the coin that had been plucked and could not be removed by wiping.

実施例２実施例１と同じ材料を２４０メツシュのガラスビーズで
表面をホーニング加工し、パルスアルマイト処理により
２１〜２４μｍの陽極酸化皮膜を生成せしめた。パルス
アルマイト処理は液温２４°Ｃの１５Ｗ／Ｖ％硫酸溶液
を電解液とし、高電圧２２Ｖで６０秒、低電圧１４Ｖで
１０秒の短形波状電圧による電解電圧のもとて２５分間
電解を行った。Example 2 The surface of the same material as in Example 1 was honed using 240-mesh glass beads, and an anodic oxide film of 21 to 24 μm was formed by pulse alumite treatment. Pulse alumite treatment uses a 15W/V% sulfuric acid solution at a liquid temperature of 24°C as an electrolyte, and electrolyzes for 25 minutes at a rectangular waveform voltage of 60 seconds at a high voltage of 22V and 10 seconds at a low voltage of 14V. went.

得られた酸化皮膜の硬貨磨耗試験結果を、ホーニング加
工しなかった面と比較して第７図に示す。The coin abrasion test results of the obtained oxide film are shown in FIG. 7 in comparison with the surface that was not honed.

実施例６および４材質として耐食アルミ合金Ａ３０５２を用い、実施例１
および２と同様にイテった。それぞれの硬貨磨耗試験結
果を第８図および第９図に示す。Examples 6 and 4 Using corrosion-resistant aluminum alloy A3052 as the material, Example 1
It was similar to 2 and 2. The results of each coin abrasion test are shown in FIGS. 8 and 9.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の方法においてホーニング加工における
ガラスビーズの粒度による酸化皮膜の損傷度への効果を
示し、第２図は酸化皮膜の厚さの効果を示す。第３図は耐傷性試験機の概要を示し、第４図は耐傷性試
験における損傷度の判定基準を示す図である。第５図は硬貨磨耗試験の概要を説明する図で、第６〜９
図は各種の陽極酸化皮膜に対する硬貨磨耗試験結果を示
す。第１０図ない・し第１２図は耐傷性試験後の表面状態を
示す写真である。FIG. 1 shows the effect of the particle size of glass beads on the degree of damage to the oxide film during honing in the method of the present invention, and FIG. 2 shows the effect of the thickness of the oxide film. FIG. 3 shows an outline of the scratch resistance tester, and FIG. 4 is a diagram showing the criteria for determining the degree of damage in the scratch resistance test. Figure 5 is a diagram explaining the outline of the coin abrasion test.
The figure shows the coin abrasion test results for various anodic oxide films. Figures 10 to 12 are photographs showing the surface condition after the scratch resistance test.

Claims (4)

Translated fromJapanese

【特許請求の範囲】[Claims]（１）アルミニウムまたはアルミニウム合金の表面を陽
極酸化処理する方法において、前記表面を脱脂した後、
２０〜４００メッシュの研磨材粒子を前記表面に吹きつ
ける加工を行い、次いで陽極酸化皮膜を１５〜１００μ
ｍの厚さで生成せしめることを特徴とするアルミニウム
の表面処理方法。(1) In a method of anodizing the surface of aluminum or aluminum alloy, after degreasing the surface,
Processing is performed by spraying abrasive particles of 20 to 400 mesh onto the surface, and then an anodic oxide film of 15 to 100 μm is applied to the surface.
1. A method for surface treatment of aluminum, characterized in that aluminum is produced in a thickness of m.（２）研磨材粒子がガラスビーズである、特許請求の範
囲第（１）項に記載の方法。(2) The method according to claim (1), wherein the abrasive particles are glass beads.（３）陽極酸化が、８〜２０Ｖの電解電圧で１５〜９０
分間の電解時間で行われる、特許請求の範囲第（１）項
または第（２）項に記載の方法。(3) Anodic oxidation is 15-90V at an electrolytic voltage of 8-20V.
A method according to claim 1 or 2, which is carried out with an electrolysis time of minutes.（４）陽極酸化が、高電圧２２〜２６Ｖ、低電圧１５〜
１８Ｖ、高電圧接続期間５５〜６５秒、くりかえし周期
６０〜９０秒の短形波状電圧による電解電圧で行われる
、特許請求の範囲第（１）項または第（２）項に記載の
方法。(4) Anodic oxidation with high voltage 22~26V, low voltage 15~
The method according to claim 1 or 2, which is carried out using an electrolytic voltage of 18 V, a high voltage connection period of 55 to 65 seconds, and a rectangular waveform voltage with a repetition period of 60 to 90 seconds.