JPH1081997A - Wheel for vehicle excellent in corrosion resistance and brilliancy - Google Patents
Wheel for vehicle excellent in corrosion resistance and brilliancyInfo
- Publication number
- JPH1081997A JPH1081997A JP25235196A JP25235196A JPH1081997A JP H1081997 A JPH1081997 A JP H1081997A JP 25235196 A JP25235196 A JP 25235196A JP 25235196 A JP25235196 A JP 25235196A JP H1081997 A JPH1081997 A JP H1081997A
- Authority
- JP
- Japan
- Prior art keywords
- film
- corrosion resistance
- wheel
- thickness
- brilliancy
- 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.)
- Granted
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 150000001450 anions Chemical class 0.000 claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 9
- 239000010407 anodic oxide Substances 0.000 claims description 23
- 239000002932 luster Substances 0.000 claims 1
- 238000011282 treatment Methods 0.000 abstract description 25
- 238000005868 electrolysis reaction Methods 0.000 abstract description 12
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003792 electrolyte Substances 0.000 abstract description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 abstract 1
- 239000010408 film Substances 0.000 description 63
- 238000000034 method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000003981 vehicle Substances 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 1
- 239000001741 Ammonium adipate Substances 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000019293 ammonium adipate Nutrition 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光輝性および耐食
性（特に耐糸錆性）に優れた車両用ホイールに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel having excellent glitter and corrosion resistance (especially, rust resistance).
【０００２】[0002]
【従来の技術】自動車等の車両に用いられるアルミニウ
ム合金製のホイールは、軽量化により燃費の向上や運動
性能の向上をもたらし、さらには見た目もよいため、一
部では鋼製ホイールに代わるものとして広く利用されて
いる。従来、このアルミニウム合金製のホイールの製作
に際しては、見た目をよりよくするために、商品のデザ
インとして光輝性を重視した、以下のような工程で製造
が行われている。 （１）まず鋳造または鍛造でホイール形状を作成する。
場合によっては、ややコストは増すが、板をスピニング
加工してホイール形状とすることも可能である。 （２）継いで、光輝性を付与したい部位（主にリム表
面）を切削や研磨により鏡面化する。 （３）表面を脱脂処理した後、水洗し、クロメート処理
を施し、水洗、乾燥して塗装下地処理とする。 （４）クロメート処理皮膜の上にクリヤー塗装（透明塗
料）を３０μｍ程度施し、１５０〜１８０℃程度の温度
で焼き付け処理し、製品とする。2. Description of the Related Art Aluminum alloy wheels used for vehicles such as automobiles are improved in fuel efficiency and driving performance by weight reduction, and are also good in appearance. Widely used. Conventionally, when manufacturing this aluminum alloy wheel, in order to make it look better, it is manufactured in the following process, which emphasizes glitter as a product design. (1) First, a wheel shape is created by casting or forging.
In some cases, it is possible to spin the plate into a wheel shape at a slightly higher cost. (2) The portion to be provided with glitter (mainly the rim surface) is mirror-finished by cutting or polishing. (3) After the surface is degreased, it is washed with water, subjected to a chromate treatment, washed with water and dried to obtain a coating base treatment. (4) A clear coating (transparent coating) is applied on the chromate-treated film to a thickness of about 30 μm and baked at a temperature of about 150 to 180 ° C. to obtain a product.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記工程で得
られたホイールは、光輝性を重視するあまり耐食性が優
れないという問題があり、特に、北米等の融雪塩を散布
する地域での使用に際しては、塗装膜下に糸錆が発生し
やすく、大きな問題となっている。これに対しては、塗
装下地処理であるクロメート皮膜やその上層のクリヤー
塗装膜を厚膜とすることが有効である。しかし、クロメ
ート皮膜を厚膜とすると表面が黄色味を帯びてしまい、
またクリヤー塗装を厚膜とすると色調の白味が強くなり
濁りを生じてしまう。いずれにしても、この様な方法で
は光輝性が大きく低下して、見た目がよいというアルミ
ニウム製ホイールの商品価値が著しく損なわれるため、
その適用は困難である。また、下地処理として施されて
いるクロメート処理は、近年、排水による河川の公害が
クローズアップされており、海外では使用が大きく制限
されつつある。しかも、これに関連して排水処理も非常
に高価になるためコスト的にも大きな問題が生じてい
る。However, the wheel obtained in the above process has a problem that it is not so corrosion-resistant because of emphasizing brilliantness. In particular, when the wheel is used in an area where snow-melting salt is sprayed such as in North America. The rust tends to occur under the coating film, which is a major problem. In order to cope with this, it is effective to make the chromate film which is a coating base treatment and the clear coating film thereover thick. However, when the chromate film is made thick, the surface becomes yellowish,
Further, when the clear coating is made thick, the whiteness of the color tone becomes strong and turbidity occurs. In any case, in such a method, the glitter is greatly reduced, and the commercial value of an aluminum wheel that looks good is significantly impaired.
Its application is difficult. In addition, in recent years, the pollution of rivers caused by drainage of chromate treatment performed as a base treatment has been highlighted, and the use thereof has been greatly restricted overseas. In addition, the wastewater treatment becomes very expensive in connection with this, so that a large cost problem has arisen.
【０００４】本発明は、上記事情を背景としてなされた
ものであり、塗装下地としてクロメート皮膜を使用する
ことなく、耐食性および光輝性ともに優れた特性が得ら
れる車両用ホイールを提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle wheel capable of obtaining excellent characteristics in both corrosion resistance and glitter without using a chromate film as a coating base. I do.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
本発明の車両用ホイールのうち、第１の発明は、アルミ
ニウム合金からなるホイール材の表面に厚さ１５０〜５
００Åの無孔質陽極酸化皮膜が形成されており、該無孔
質陽極酸化皮膜上にクリヤー塗装が施されていることを
特徴とする。Means for Solving the Problems In order to solve the above-mentioned problems, a first aspect of the vehicle wheel of the present invention is that a wheel material made of an aluminum alloy has a thickness of 150 to 5 mm.
It is characterized in that a non-porous anodic oxide film of 00 ° is formed, and a clear coating is applied on the non-porous anodic oxide film.
【０００６】第２の発明は、第１の発明において、無孔
質陽極酸化皮膜が、空孔率１０％未満、含水量５重量％
未満、アニオン含有量２重量％未満であることを特徴と
する。第３の発明は、第１または第２の発明において、
クリヤー塗装の膜厚が１０〜２５μｍであることを特徴
とする。According to a second aspect, in the first aspect, the nonporous anodic oxide film has a porosity of less than 10% and a water content of 5% by weight.
And an anion content of less than 2% by weight. A third invention is a method according to the first or second invention, wherein
The thickness of the clear coating is 10 to 25 μm.
【０００７】本発明は、上記したように、下地処理とし
てクロメート処理の代わりに厚さ１５０〜５００Åの薄
膜の無孔質陽極酸化皮膜を施したものである。上記の無
孔質陽極酸化皮膜としては、実質的に無孔質（例えば空
孔率１０％未満）である皮膜をいい、封孔処理を必要と
することなく、陽極酸化ままで無孔質であるものが望ま
しい。例えば、従来の陽極酸化皮膜は、陽極酸化ままで
は、空孔率は１６％程度に達しており、良好な耐食性を
得るためには、加圧蒸気処理による封孔処理が必要にな
る。しかし、このような封孔処理を行うと、酸化皮膜中
の含水量が大幅に増えるため、クリヤー塗装時の焼き付
けに際し、皮膜から水分が蒸散して塗装膜の密着性が悪
化し、耐食性を低下させる。このため、陽極酸化皮膜
は、封孔処理を経ないでも、陽極酸化ままで空孔率が低
いのが望ましい。In the present invention, as described above, a thin nonporous anodic oxide film having a thickness of 150 to 500.degree. The non-porous anodized film refers to a film that is substantially non-porous (for example, having a porosity of less than 10%), and is non-porous as anodized without requiring sealing treatment. Some are desirable. For example, a conventional anodic oxide film has a porosity of about 16% when anodized as it is, and requires a sealing treatment by pressurized steam treatment in order to obtain good corrosion resistance. However, when such a sealing treatment is performed, the water content in the oxide film is greatly increased, so that when baking at the time of clear coating, moisture evaporates from the film and the adhesion of the coated film is deteriorated, and the corrosion resistance is reduced. Let it. For this reason, it is desirable that the anodic oxide film has a low porosity without anodization, even though the sealing treatment is not performed.
【０００８】上記した本発明の構成により、光輝性を確
保したままで耐食性、特に耐糸錆性を向上させることが
できる。したがって、酸化皮膜を薄くすることができ、
これにより良好な光輝性が得られる。しかも、この耐食
性の向上により、また、後述するように塗装膜の密着性
が向上することにより、上層のクリヤー塗装を必要以上
に厚くしなくてもよく、したがってクリヤー塗装の薄膜
化によりさらにホイールの光輝性を向上させることもで
きる。上記したホイールは主に自動車に使用されるが、
その他に自動二輪車、自転車等に使用することもでき
る。According to the above-described structure of the present invention, it is possible to improve the corrosion resistance, particularly the yarn rust resistance, while maintaining the glitter. Therefore, the oxide film can be made thinner,
Thereby, good glitter is obtained. Moreover, by improving the corrosion resistance, and by improving the adhesion of the coating film as described later, the upper clear coating does not have to be unnecessarily thick. Brightness can also be improved. The above wheels are mainly used in automobiles,
In addition, it can be used for motorcycles, bicycles and the like.
【０００９】[0009]
【発明の実施の形態】本発明のホイールの材料には、各
種アルミニウム合金を使用することができ、特にその成
分が限定されるものではない。但し、ホイールとして十
分な強度を得るために、ＪＩＳ Ａ５０００系、同６０
００系のアルミニウム合金を使用するのが望ましく、調
質合金、非調質合金のいずれであってもよい。これら合
金を用いたホイール材の製造方法も特に限定されるもの
ではなく、鋳造、鍛造、プレス加工、スピニング加工等
によりホイール形状に成形することができる。このホイ
ール材は、所望により、その表面のうち、光輝性を付与
したい部位（主にリム表面）を切削や研磨により鏡面化
する。また、このような素材に対して通常は前処理が施
される。この前処理としては、通常の界面活性剤、有機
溶剤等の接触が挙げられるが、また、表面の均一化のた
めに苛性洗浄やデスマット処理を行っても良く、その内
容は特に限定されない。例えば、素材の表面に付着した
油脂分を除去し、素材表面の不均質な酸化物皮膜が除去
する前処理を行うことができ、そのためには、弱アルカ
リ性の脱脂液による脱脂処理を施したのち、水酸化ナト
リウム水溶液でアルカリエッチングをし、さらに硝酸水
溶液中でデスマット処理を行う方法や脱脂処理後に酸洗
浄を行う方法などが適宜選択される。BEST MODE FOR CARRYING OUT THE INVENTION Various aluminum alloys can be used for the material of the wheel of the present invention, and the components thereof are not particularly limited. However, in order to obtain sufficient strength as a wheel, JIS A5000 series, 60
It is desirable to use a 00-based aluminum alloy, and it may be either a tempered alloy or a non-tempered alloy. The method of manufacturing the wheel material using these alloys is not particularly limited, and the wheel material can be formed into a wheel shape by casting, forging, pressing, spinning, or the like. If desired, the wheel material is made into a mirror surface by cutting or polishing a portion (mainly the rim surface) of the surface to which glitter is desired. In addition, such materials are usually subjected to a pretreatment. Examples of the pretreatment include contact with a normal surfactant, an organic solvent, or the like, but caustic washing or desmutting may be performed to make the surface uniform, and the contents thereof are not particularly limited. For example, it is possible to carry out a pretreatment for removing the fats and oils adhering to the surface of the material and for removing an inhomogeneous oxide film on the surface of the material. A method of performing alkali etching with an aqueous solution of sodium hydroxide and further performing a desmut treatment in an aqueous solution of nitric acid, a method of performing acid cleaning after a degreasing treatment, and the like are appropriately selected.
【００１０】ついで、上記ホイール材に陽極酸化処理お
よびクリヤー塗装を施す。これら処理および塗装は、ホ
イール材の一部表面にのみ施すものであってもよく、ま
た所望により全面に施すものであっても良い。また、い
ずれか一方のみが施されている部分を含むものであって
も良い。なお、陽極酸化皮膜は、前記したように陽極酸
化ままで無孔質であるのが望ましく、このような陽極酸
化皮膜は、以下の特別な処理によって得られる。すなわ
ち、陽極酸化皮膜処理に使用される電解浴としては、生
成される陽極酸化皮膜を溶解しにくい電解質である硼
酸、硼酸塩、リン酸塩、アジピン酸塩、フタル酸塩、安
息香酸塩、酒石酸塩、クエン酸塩などの群から選ばれる
１種または２種以上を溶解した水溶液が用いられる。な
お、下記の条件（空孔率、含水量、アニオン含有量）を
満たす陽極酸化皮膜を生成するためには、これらの電解
質のなかでも硼酸、硼酸塩、アジピン酸塩の１種または
２種以上を用いることが好ましい。これら電解浴中の電
解質濃度は２重量％からその電解質の飽和濃度までの範
囲で選ばれる。また電解浴の浴温としては、下記皮膜を
得るためには２０〜７０℃の範囲が好ましく、さらに３
０〜５０℃の範囲が一層望ましい。Next, the wheel material is subjected to anodizing treatment and clear coating. These treatments and coatings may be performed only on a part of the surface of the wheel material, or may be performed on the entire surface if desired. Further, it may include a portion to which only one of them is applied. The anodized film is desirably anodized and nonporous as described above, and such an anodized film is obtained by the following special treatment. That is, as the electrolytic bath used for the anodic oxide film treatment, boric acid, borate, phosphate, adipate, phthalate, benzoate, and tartaric acid, which are electrolytes that hardly dissolve the generated anodic oxide film, are used. An aqueous solution in which one or more selected from the group of salts, citrates and the like are dissolved. In order to form an anodic oxide film satisfying the following conditions (porosity, water content, anion content), among these electrolytes, one or more of boric acid, borate and adipate are used. It is preferable to use The electrolyte concentration in these electrolytic baths is selected in the range from 2% by weight to the saturated concentration of the electrolyte. The bath temperature of the electrolytic bath is preferably in the range of 20 to 70 ° C. in order to obtain the following film.
The range of 0 to 50C is more desirable.
【００１１】この電解浴中で、ホイール材は、連続ある
いは断続であっても陽極となるように電源に接続されて
電解される。陰極には通常は不溶性の導電材料が用いら
れる。電解電流としては、直流電流などが用いられ、直
流電解では直流密度０．３〜２０Ａ／ｄｍ2、電解時間
５秒〜３０分で電解が行われる。これら直流密度および
電解時間が下限未満であると、十分に皮膜が形成され
ず、直流密度が大きいと皮膜やけ等の表面欠損が生じ
る。なお、電解時間が長すぎると、皮膜の表面が溶解し
空孔率が増してしまう。印加電圧は、直流電解では電圧
１Ｖに対して形成される酸化皮膜厚さが約１４Åとなる
関係があることから、１５０〜５００オングストローム
の厚さの酸化皮膜を得るために、１０〜３５Ｖ、好まし
くは１５〜２５Ｖの範囲とされる。電源装置などの点か
らは３０Ｖ以下とすることが好ましく、このような低電
圧での電解でも優れた塗膜密着性と塗装後耐食性を有す
る無孔質の陽極酸化皮膜が得られる。なお、陽極酸化皮
膜の電解に用いる電解液は硼酸塩、アジピン酸塩、酒石
酸塩等の中性のものであるため、クロメート処理のよう
な排水処理の問題をなくすことができる。In this electrolytic bath, the wheel material is connected to a power source and electrolyzed so as to serve as an anode even if it is continuous or intermittent. An insoluble conductive material is usually used for the cathode. As the electrolysis current, a direct current or the like is used. In direct current electrolysis, electrolysis is performed at a direct current density of 0.3 to 20 A / dm 2 and an electrolysis time of 5 seconds to 30 minutes. If the direct current density and the electrolysis time are less than the lower limits, a film is not formed sufficiently, and if the direct current density is high, surface defects such as a film and burns occur. If the electrolysis time is too long, the surface of the coating dissolves and the porosity increases. The applied voltage is 10 to 35 V, preferably, in order to obtain an oxide film having a thickness of 150 to 500 angstroms, since the thickness of the oxide film formed with respect to a voltage of 1 V in DC electrolysis is about 14 °. Is in the range of 15 to 25V. The voltage is preferably 30 V or less from the viewpoint of a power supply device and the like, and a nonporous anodic oxide film having excellent coating adhesion and corrosion resistance after coating can be obtained even by electrolysis at such a low voltage. In addition, since the electrolytic solution used for electrolysis of the anodic oxide film is a neutral solution such as borate, adipate, and tartrate, the problem of drainage treatment such as chromate treatment can be eliminated.
【００１２】このようにして得られた陽極酸化皮膜は、
１５０〜５００Å、好ましくは２００〜３５０Åの厚さ
を有しており、かつ均一で無孔質である。その空孔率は
最大でも１０％以下であり、通常は２％以下となってい
る。なお、空孔率とは、酸化皮膜表面で、孔が占める表
面積の割合（％）をいう。また、皮膜の含水量は５重量
％以下で、通常は１〜３重量％と極めて低い値を示す。
さらに酸化皮膜のアニオン含有量も、２重量％以下と低
い値となっている。一方、通常の硫酸浴、シュウ酸浴で
得られた多孔質の陽極酸化皮膜は、空孔率が数十％と非
常に高く、含水量は封孔処理後で１５重量％程度、アニ
オン含有量は１２〜１５重量％程度にまで達する。The anodic oxide film thus obtained is
It has a thickness of 150-500 °, preferably 200-350 °, and is uniform and non-porous. The porosity is at most 10% or less, usually 2% or less. The porosity refers to the ratio (%) of the surface area occupied by holes on the oxide film surface. Further, the water content of the film is 5% by weight or less, and usually shows an extremely low value of 1 to 3% by weight.
Furthermore, the anion content of the oxide film is as low as 2% by weight or less. On the other hand, the porous anodic oxide film obtained in a normal sulfuric acid bath or oxalic acid bath has a very high porosity of several tens of percent, a water content of about 15% by weight after the sealing treatment, and an anion content of Reaches about 12 to 15% by weight.
【００１３】なお、上記皮膜の厚さの限定や空孔率等の
数値が望ましいとされるのは以下の理由による。 （１）厚さ（１５０〜５００Å） 酸化皮膜厚さは耐食性及び光輝性に影響を及ぼす。膜厚
が厚いほど耐食性は優れる傾向にあるが、光輝性は低下
し光沢度が低くなってしまう。具体的には、膜厚が１５
０Å未満であると、十分な耐食性、耐糸錆性が得られ
ず、一方、膜厚が５００Åを越えると、光輝性が劣化す
るため、両者のバランスがとれた、すなわち、耐食性、
光輝性ともに優れた表面とするために、陽極酸化皮膜の
膜厚を１５０〜５００Åに限定する。なお、さらに、同
様の理由で下限を２００、上限を３５０Åとするのが望
ましい。It is noted that the limitation of the thickness of the film and numerical values such as the porosity are desirable for the following reasons. (1) Thickness (150 to 500 °) The thickness of the oxide film affects corrosion resistance and glitter. The thicker the film thickness, the better the corrosion resistance tends to be, but the glitter is reduced and the gloss is reduced. Specifically, when the film thickness is 15
If it is less than 0 °, sufficient corrosion resistance and thread rust resistance cannot be obtained. On the other hand, if the film thickness exceeds 500 °, the glittering property is deteriorated, and the two are balanced.
The thickness of the anodic oxide film is limited to 150 to 500 ° in order to obtain a surface having excellent glittering properties. For the same reason, it is desirable to set the lower limit to 200 and the upper limit to 350 °.
【００１４】（２）空孔率１０％未満、含水量５重量％
未満、アニオン含有量２重量％未満 良好な耐食性を確保するために、上記条件を満たすのが
望ましい。具体的には、含水量が５％以上になると、ク
リヤー塗装の焼き付け時に皮膜から水分が放出されてク
リヤー塗装膜の密着性が低下し、この影響で耐食性が劣
化する。また、アニオン含有量が２％以上になっても、
クリヤー塗装の焼き付け時にアニオンや分解ガスが放出
されて塗装膜の密着性が低下して耐食性が劣化する。さ
らに、空孔率が１０％以上になると、この皮膜に形成し
た孔から腐食物質が侵入し耐食性が低下してしまう。本
発明の陽極酸化皮膜は１５０〜５００Åと非常に薄膜で
あるが、十分な耐食性が得られる理由は、含水量５％未
満、アニオン含有量２％未満であることにより塗膜密着
性が高いこと及び無孔質であることにより皮膜のバリヤ
ー性が高いことによっており、陽極酸化皮膜を薄くでき
ることにより優れた光輝性を得ている。(2) Porosity of less than 10%, water content of 5% by weight
, Less than 2% by weight anion content In order to ensure good corrosion resistance, it is desirable to satisfy the above conditions. Specifically, when the water content is 5% or more, moisture is released from the film at the time of baking of the clear coating, and the adhesion of the clear coating film is reduced, and the corrosion resistance is deteriorated by this influence. Also, even if the anion content is 2% or more,
During baking of the clear coating, anions and decomposition gases are released, which lowers the adhesion of the coating film and deteriorates the corrosion resistance. Further, when the porosity is 10% or more, corrosive substances penetrate through holes formed in this film, and the corrosion resistance is reduced. Although the anodic oxide film of the present invention is a very thin film of 150 to 500 °, the reason why sufficient corrosion resistance is obtained is that the adhesion of the coating film is high because the water content is less than 5% and the anion content is less than 2%. Further, since the film is non-porous, the barrier property of the film is high, and excellent brilliancy is obtained by making the anodic oxide film thin.
【００１５】（４）クリヤー塗装 上記陽極酸化皮膜上にクリヤー塗装を従来どおり施すこ
とで、耐食性が優れ、かつ光輝性も良好なホイールを提
供できる。塗装方法は常法を含め、特に限定されるもの
ではない。また、クリヤー塗装には、透明性の高い塗料
であれば特に制限なく使用することができるが、例え
ば、アクリル系クリアー塗料が挙げられる。上記塗料を
用いて、例えば、１４０〜１７０℃で、３０〜６０分加
熱する焼き付けにより塗装を行うことができる。なお、
本発明のホイールでは、上記した無孔質の陽極酸化皮膜
により良好な耐食性が得られているため、クリヤー塗装
膜の薄膜化も可能であり、これにより光輝性を一層向上
させることができる。この塗装膜の膜厚としては、耐食
性を確保するために１５μｍ以上が望ましく、また、優
れた光輝性を得るために、２５μｍ以下とするのが望ま
しい。(4) Clear Coating By applying a clear coating on the anodic oxide film as before, it is possible to provide a wheel having excellent corrosion resistance and good glitter. The coating method is not particularly limited, including an ordinary method. The clear coating can be used without particular limitation as long as it is a paint having high transparency. For example, an acrylic clear paint can be used. Using the above coating material, for example, the coating can be performed by baking by heating at 140 to 170 ° C. for 30 to 60 minutes. In addition,
In the wheel of the present invention, good corrosion resistance is obtained by the non-porous anodic oxide film described above, so that the clear coating film can be made thinner, whereby the glitter can be further improved. The thickness of the coating film is desirably 15 μm or more in order to ensure corrosion resistance, and desirably 25 μm or less in order to obtain excellent glitter.
【００１６】[0016]
【実施例】以下に本発明の一実施例を説明する。ＪＩＳ
Ａ５０５２アルミニウム合金材（２．５％Ｍｇ）を常
法によりホイール形状に成形し、その表面をダイヤモン
ドバイトで切削し鏡面とした後、弱アルカリ性の界面活
性剤を含む弱エッチング性脱脂液で５０℃×３分の脱脂
処理を行った。ついで、このホイール材に、１ｌ当た
り、硼酸５０ｇ、硼酸塩２ｇ、アジピン酸アンモニウム
５０ｇを電解質として含む電解液を用いて、浴温５０
℃、電圧１０〜３５Ｖ、直流密度０．５〜５Ａ／ｄ
ｍ2、電解時間２０秒〜５分の条件で電解処理し、１５
０〜５００Å膜厚の陽極酸化皮膜を形成した。次いで、
この上層に、アクリル系クリヤー塗装を２０μｍ厚で施
し、１８０℃で３０分の焼き付け処理をした。An embodiment of the present invention will be described below. JIS
A5052 aluminum alloy material (2.5% Mg) is formed into a wheel shape by a conventional method, and its surface is cut with a diamond bite to a mirror surface, and then a weak etching degreasing solution containing a weak alkaline surfactant at 50 ° C. A degreasing treatment of × 3 minutes was performed. Next, a bath temperature of 50 g was applied to the wheel material using an electrolytic solution containing 50 g of boric acid, 2 g of borate, and 50 g of ammonium adipate as an electrolyte per liter.
° C, voltage 10-35V, DC density 0.5-5A / d
m 2 , electrolysis time of 20 seconds to 5 minutes, 15
An anodic oxide film having a thickness of 0 to 500 ° was formed. Then
An acrylic clear coating having a thickness of 20 μm was applied to the upper layer and baked at 180 ° C. for 30 minutes.
【００１７】また、比較のため、上記ホイール材に、上
記と同じ電解液を用いて、７Ｖ×３分（比較例１）、４
３Ｖ×３分（比較例２）の条件で電解を行い、さらに比
較例３として１５ｗｔ％Ｈ2ＳＯ4、２０℃の電解液を用
いて、電流密度１．３Ａ／ｄｍ2、１６Ｖ×６０秒の条
件で電解して陽極酸化皮膜を形成し、それぞれに上記と
同様の条件でクリヤー塗装を施した（比較例１〜３）。
さらに、他の比較例として、上記ホイール材に８ｍｇ／
ｍ2（比較例４）または１５ｍｇ／ｍ2（比較例５）の量
で無色系クロメート処理を施して、その上層に上記と同
様のクリヤー塗装を施した。なお、８ｍｇ／ｍ2のクロ
メート処理が従来材と同等である。For comparison, the same electrolyte solution as described above was used for the wheel material, for 7 V × 3 minutes (Comparative Example 1).
Electrolysis was performed under the conditions of 3 V × 3 minutes (Comparative Example 2). Further, as Comparative Example 3, an electrolytic solution of 15 wt% H 2 SO 4 and 20 ° C. was used, current density 1.3 A / dm 2 , 16 V × 60 seconds. To form an anodized film, and each was subjected to clear coating under the same conditions as above (Comparative Examples 1 to 3).
Further, as another comparative example, 8 mg /
A colorless chromate treatment was applied in an amount of m 2 (Comparative Example 4) or 15 mg / m 2 (Comparative Example 5), and the upper layer was subjected to the same clear coating as described above. In addition, the chromate treatment of 8 mg / m 2 is equivalent to the conventional material.
【００１８】上記方法により得られたホイールの陽極酸
化皮膜の空孔率、含水率、アニオン含有量、およびクリ
ヤー塗装の塗膜密着性、ならびにホイールの光輝性、耐
食性を以下の方法により評価し、その結果を表１に示し
た。表１より明らかなように、本発明のホイールによれ
ば、耐食性、光輝性ともに優れた特性が得られているの
に対し、比較例では、いずれか一方が明らかに劣ってい
た。The porosity, the water content, the anion content, the coating adhesion of the clear coating, and the glitter and corrosion resistance of the wheel obtained by the above method were evaluated by the following methods. The results are shown in Table 1. As is evident from Table 1, according to the wheel of the present invention, excellent characteristics were obtained in both corrosion resistance and brilliancy, but in the comparative example, either one was clearly inferior.
【００１９】[0019]
【表１】 [Table 1]
【００２０】［評価方法］ （１）空孔率 単位面積当たりの孔の占める面積の割合を電子顕微鏡観
察により測定する。 （２）含水率 熱重量分析により測定。室温から５５０℃まで加熱した
際の重量減少を測定。 （３）アニオン含有量 ＧＤ−ＭＳ（グロー放電質量分析計）により測定[Evaluation Method] (1) Porosity The ratio of the area occupied by holes per unit area is measured by observation with an electron microscope. (2) Water content Measured by thermogravimetric analysis. Measure the weight loss when heated from room temperature to 550 ° C. (3) Anion content Measured by GD-MS (glow discharge mass spectrometer)
【００２１】（４）塗膜密着性 １ｍｍ角の碁盤目を１００個切り、セロテープ剥離試験
で残存した個数率を求めた。 （５）光輝性 銀鏡を１００とした場合の光沢度をそれぞれのホイール
で測定し、その相対数値で評価した。 （６）耐食性１ 下地処理及びクリヤー塗装した試料にクロスカットを加
え、ＪＩＳ−Ｈ８６８０に示されるＣＡＳＳ試験を７２
時間行い、クロスカット部に生じた糸錆長さの総長さを
比較した。 （７）耐食性２ 下地処理及びクリヤー塗装した試料にクロスカットを加
え、自動車規格（ＪＡＳＯＭ ６０９−９１）の複合サ
イクル腐食試験を３６０サイクル行い、クロスカット部
に生じた糸錆長さの総長さを比較した。(4) Adhesion of coating film 100 squares of 1 mm square were cut, and the number of remaining pieces was determined by a cellophane peel test. (5) Brightness The glossiness when the silver mirror was set to 100 was measured with each wheel, and the relative value was evaluated. (6) Corrosion resistance 1 A cross-cut was applied to the substrate-treated and clear-coated sample, and a CASS test indicated in JIS-H8680 was performed for 72 times.
After a time, the total length of the thread rust generated in the cross cut portion was compared. (7) Corrosion resistance 2 A cross-cut was applied to the base-treated and clear-coated sample, and a combined cycle corrosion test of the automotive standard (JASOM 609-91) was performed for 360 cycles. Compared.
【００２２】[0022]
【発明の効果】以上説明したように、本発明の車両用ホ
イールによれば、アルミニウム合金からなるホイール材
の表面に厚さ１５０〜５００Åの無孔質陽極酸化皮膜を
形成し、該無孔質陽極酸化皮膜上にクリヤー塗装を施し
たので、光輝性を損なうことなく耐食性、特に耐糸錆性
を向上させることができ、光輝性、耐食性ともに優れた
車両用ホイールが得られる。As described above, according to the vehicle wheel of the present invention, a nonporous anodic oxide film having a thickness of 150 to 500 ° is formed on the surface of a wheel material made of an aluminum alloy. Since the clear coating is applied on the anodized film, the corrosion resistance, particularly the thread rust resistance, can be improved without impairing the glitter, and a vehicle wheel excellent in both glitter and corrosion resistance can be obtained.
【００２３】また、無孔質陽極酸化皮膜として、空孔率
１０％未満、含水量５％未満、アニオン含有量２％未満
のものを使用すれば、優れた耐食性が確実に得られ、よ
って酸化皮膜の薄膜化によって優れた光輝性を得ること
が可能になる。また、クリヤー塗装の膜厚を１０〜２５
μｍとすれば、良好な耐食性を得た上で、さらに光輝性
を向上させることができる。When a nonporous anodic oxide film having a porosity of less than 10%, a water content of less than 5% and an anion content of less than 2% is used, excellent corrosion resistance can be obtained without fail. By making the film thinner, it becomes possible to obtain excellent glitter. Further, the thickness of the clear coating is set to 10 to 25.
When the thickness is set to μm, good corrosion resistance can be obtained, and the glitter can be further improved.
Claims (3)
表面に厚さ１５０〜５００Åの無孔質陽極酸化皮膜が形
成されており、該無孔質陽極酸化皮膜上にクリヤー塗装
が施されていることを特徴とする耐食性および光輝性に
優れた車両用ホイール1. A non-porous anodic oxide film having a thickness of 150 to 500 ° is formed on a surface of a wheel material made of an aluminum alloy, and a clear coating is applied on the non-porous anodic oxide film. Vehicle wheels with excellent corrosion resistance and brilliant characteristics
満、含水量５重量％未満、アニオン含有量２重量％未満
であることを特徴とするに請求項１記載の耐食性および
光輝性に優れた車両用ホイール2. The corrosion resistance and luster of claim 1, wherein the nonporous anodized film has a porosity of less than 10%, a water content of less than 5% by weight, and an anion content of less than 2% by weight. Excellent vehicle wheel
μｍであることを特徴とする請求項１または２に記載の
耐食性および光輝性に優れた車両用ホイール3. The clear coating has a thickness of 10 to 25.
3. The vehicle wheel according to claim 1, wherein the thickness is μm. 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25235196A JP3553288B2 (en) | 1996-09-03 | 1996-09-03 | Vehicle wheels with excellent corrosion resistance and glitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25235196A JP3553288B2 (en) | 1996-09-03 | 1996-09-03 | Vehicle wheels with excellent corrosion resistance and glitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1081997A true JPH1081997A (en) | 1998-03-31 |
| JP3553288B2 JP3553288B2 (en) | 2004-08-11 |
Family
ID=17236088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25235196A Expired - Fee Related JP3553288B2 (en) | 1996-09-03 | 1996-09-03 | Vehicle wheels with excellent corrosion resistance and glitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3553288B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005350775A (en) * | 2000-05-31 | 2005-12-22 | Mitsubishi Alum Co Ltd | Surface-treated aluminum material and production method therefor |
| WO2006134737A1 (en) * | 2005-06-17 | 2006-12-21 | Tohoku University | Metal oxide film, laminate, metal member and process for producing the same |
| JP2011032540A (en) * | 2009-08-03 | 2011-02-17 | Denso Wave Inc | Method of manufacturing arm cover for robot |
| US8124240B2 (en) | 2005-06-17 | 2012-02-28 | Tohoku University | Protective film structure of metal member, metal component employing protective film structure, and equipment for producing semiconductor or flat-plate display employing protective film structure |
| JP2016037061A (en) * | 2014-08-05 | 2016-03-22 | 三菱レイヨン株式会社 | Vehicular wheel |
-
1996
- 1996-09-03 JP JP25235196A patent/JP3553288B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005350775A (en) * | 2000-05-31 | 2005-12-22 | Mitsubishi Alum Co Ltd | Surface-treated aluminum material and production method therefor |
| WO2006134737A1 (en) * | 2005-06-17 | 2006-12-21 | Tohoku University | Metal oxide film, laminate, metal member and process for producing the same |
| US8124240B2 (en) | 2005-06-17 | 2012-02-28 | Tohoku University | Protective film structure of metal member, metal component employing protective film structure, and equipment for producing semiconductor or flat-plate display employing protective film structure |
| US8206833B2 (en) | 2005-06-17 | 2012-06-26 | Tohoku University | Metal oxide film, laminate, metal member and process for producing the same |
| US9476137B2 (en) | 2005-06-17 | 2016-10-25 | Tohoku University | Metal oxide film, laminate, metal member and process for producing the same |
| JP2011032540A (en) * | 2009-08-03 | 2011-02-17 | Denso Wave Inc | Method of manufacturing arm cover for robot |
| JP2016037061A (en) * | 2014-08-05 | 2016-03-22 | 三菱レイヨン株式会社 | Vehicular wheel |
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