JPH0791659B2 - Surface treatment of aluminum or aluminum alloy - Google Patents
Surface treatment of aluminum or aluminum alloyInfo
- Publication number
- JPH0791659B2 JPH0791659B2 JP17356184A JP17356184A JPH0791659B2 JP H0791659 B2 JPH0791659 B2 JP H0791659B2 JP 17356184 A JP17356184 A JP 17356184A JP 17356184 A JP17356184 A JP 17356184A JP H0791659 B2 JPH0791659 B2 JP H0791659B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- treatment
- film
- aluminum alloy
- coupling agent
- 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 - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
【発明の詳細な説明】 （産業上利用分野） 本発明は、アルミニウムまたはアルミニウム合金の表面
処理法に関し、特に化学的に形成した酸化皮膜の防錆効
果を高めることにより、アルミニウムまたはアルミニウ
ム合金としての耐食性を向上せしめたアルミニウムまた
はアルミニウム合金の表面処理法に関する。Description: TECHNICAL FIELD The present invention relates to a surface treatment method for aluminum or an aluminum alloy, and in particular, by increasing the rust preventive effect of a chemically formed oxide film, The present invention relates to a surface treatment method for aluminum or aluminum alloy having improved corrosion resistance.
（従来の技術） 従来、アルミニウムまたはアルミニウム合金（以下、単
にアルミニウムと称する。）は、それ自体が耐食性に乏
しいことからその改善のために種々の表面処理が行われ
ている。(Prior Art) Conventionally, aluminum or an aluminum alloy (hereinafter, simply referred to as aluminum) has poor corrosion resistance, and thus various surface treatments have been performed for improvement thereof.
即ち、その一例としては、アルマイト処理による電気化
学的方法、またベーマイト処理、クロメート処理などで
知られる化成処理などであるが、電気化学的方法につい
ては、それのみで充分なる耐食性は得られるものの、実
際に工業的に生産を行うまでには多大の設備、費用を要
して容易に着手できないという経済上の不利益を有して
おり、また化成処理におけるベーマイト処理では容易性
の点では良好であるも、満足のいく耐食性は得難く、ま
た使用可能なアルミニウムも制限され、更に、クロメー
ト処理においては公害上の問題が付随すると共に、ベー
マイト処理のものと同様耐食性の点でも未だ不十分であ
るなど、いずれの方法においてもその改良の余地が残さ
れていた。That is, as an example, an electrochemical method by alumite treatment, also boehmite treatment, chemical conversion treatment known as chromate treatment, etc., but for the electrochemical method, although it is sufficient corrosion resistance alone, It has an economic disadvantage that it requires a large amount of equipment and cost before it can be industrially manufactured, and that it cannot be started easily, and boehmite treatment in chemical conversion treatment is not easy in terms of ease. However, it is difficult to obtain satisfactory corrosion resistance, the usable aluminum is limited, and in addition to pollution problems in the chromate treatment, the corrosion resistance is still insufficient in the same manner as the boehmite treatment. There is still room for improvement in any of these methods.
更に、アルキルシリケートのアルコール溶液で処理する
ことも提案されている（特開昭51−105940号公報）が、
該方法においても、単にSiO2膜を基材に形成したもので
あり、耐食性の点で問題が残されていた。Further, it has been proposed to treat with an alcohol solution of alkyl silicate (JP-A-51-105940).
Also in this method, the SiO 2 film was simply formed on the base material, and there was a problem in terms of corrosion resistance.
そこで本発明は、アルミニウムに対する化成処理、即
ち、アルミニウム表面に形成した化学的酸化皮膜に着目
し、何故それらが耐食性の点で劣るのかを追求した結
果、以下の知見を得るに至った。Therefore, the present invention focused on chemical conversion treatment of aluminum, that is, a chemical oxide film formed on the surface of aluminum, and as a result of pursuing why they are inferior in corrosion resistance, the following findings were obtained.
即ち、アルミニウム表面に形成された化学的酸化皮膜
は、水に対しての親和性が良好である親和化されたもの
となっており、その為水分は皮膜に対して付着し易く、
また濡れ易くなり、結果的にこれが起因してアルミニウ
ム自体は腐食劣化され易いという知見である。現状にお
いてはこれに基づきこの親和化された皮膜を逆に疎水化
して撥水効果を出すべく界面活性剤による処理、或いは
シリコンオイル等を塗布することも考えられが、いずれ
も使用条件、環境等によってはその処理剤が皮膜より離
脱して効力を消失する恐れが生じ延いてはこれが腐食へ
とつながるため、これらの方法は根本的な問題解決のた
めの対象とはなり得ていないのが実状である。That is, the chemical oxide film formed on the aluminum surface is an affinity film having a good affinity for water, so that water easily adheres to the film,
Further, it is a finding that aluminum is easily wetted, and as a result, aluminum itself is easily corroded and deteriorated. At present, based on this, it is possible to reversely hydrophobize this affinity film to treat it with a surfactant or to apply silicone oil or the like in order to obtain a water-repellent effect. In some cases, the treatment agent may come out of the coating and lose its effectiveness, which leads to corrosion, so that these methods cannot be the target for solving the fundamental problem. Is.
（発明の目的） 本発明は、このような状況に鑑みなされたもので、経済
的に見て有利な化成処理によるアルミニウムの化学的酸
化皮膜に対し、物理的、且つ、化学的に安定な疎水化表
面を形成し得る処理剤について種々検討を重ねた結果、
特定のカップリング剤が最適であることを見い出し、遂
に本発明を完成したものである。(Object of the invention) The present invention has been made in view of the above circumstances, and is a physically stable and chemically stable hydrophobic layer against a chemically oxidized aluminum film formed by chemical conversion treatment, which is economically advantageous. As a result of various studies on a treatment agent capable of forming an activated surface,
The inventors have found that a specific coupling agent is optimal, and finally completed the present invention.
（発明の構成） 即ち、本発明は、基材たるアルミニウムまたはアルミニ
ウム合金表面に、化学的に酸化皮膜を形成し、次いで該
酸化皮膜を、加水分解可能な官能基と、アルキル基より
なる疎水基とを有するシラン系カップリング剤にて処理
し、基剤側の皮膜はSi−Ｏの共有結合を生じさせ、最表
面の皮膜はアルキル基を配するようにしてなることを特
徴とするアルミニウムまたはアルミニウム合金の表面処
理法を要旨とするものである。(Structure of the Invention) That is, the present invention is to form a chemically oxidized film on the surface of aluminum or aluminum alloy as a base material, and then to form a hydrophobic group consisting of a hydrolyzable functional group and an alkyl group. Treated with a silane-based coupling agent having, and the coating on the base side produces a Si—O covalent bond, and the coating on the outermost surface is provided with an alkyl group. The gist is the surface treatment method of an aluminum alloy.
本発明において使用されるカップリング剤は、シラン系
のものであり、具体的には、Ｘ〜Si（OR）３の一般式で
表される。ここでＸはアルキル基よりなる疎水基であ
り、Ｒは加水分解可能なメトキシ基、エトキシ基などの
官能基である。本発明のカップリング剤は、このように
１つの分子内に二種の官能基を有しているものであり、
例えばアルミニウムの化学的酸化皮膜たるベーマイト皮
膜に対してはシラノール基の加水分解により酸化アルミ
ニウムと非常に安定な化学共有結合を生じ、これにより
カップリング剤は酸化皮膜より容易に離脱したりするこ
とがないもので、またカップリング剤処理の施された酸
化皮膜の最表面にはアルキル基よりなる疎水基が位置す
ることにより、アルミニウムとしての表面は疎水化さ
れ、その結果として撥水効果が上がり耐食性が非常に向
上するものと思われる。これらのメカニズムを以下に示
す。The coupling agent used in the present invention is of a silane type, and is specifically represented by the general formula of X to Si (OR) 3 . Here, X is a hydrophobic group consisting of an alkyl group, and R is a functional group such as a hydrolyzable methoxy group or ethoxy group. The coupling agent of the present invention thus has two kinds of functional groups in one molecule,
For example, with respect to boehmite film, which is a chemical oxide film of aluminum, a very stable chemical covalent bond is formed with aluminum oxide due to hydrolysis of silanol groups, which may cause the coupling agent to be easily released from the oxide film. In addition, the surface of aluminum is made hydrophobic by the presence of a hydrophobic group consisting of an alkyl group on the outermost surface of the oxide film treated with a coupling agent, and as a result, the water repellency effect is improved and corrosion resistance is improved. Seems to be greatly improved. These mechanisms are shown below.
尚、上記カップリング剤の化学的酸化皮膜に対する安定
性を増すためには、カップリング剤処理後、これに温風
を当てたり、或いはこれを高温室に配置したりするなど
の熱処理を施しても良いものである。 In order to increase the stability of the coupling agent with respect to the chemical oxide film, after the coupling agent treatment, heat treatment such as applying hot air to the coupling agent or placing it in a high temperature chamber is performed. Is also good.
（実施例） 実施例１ アルミニウム板（JIS2011）を95℃以上の１％トリエタ
ノールアミン水溶液に20分間浸漬してベーマイト処理を
行い、次いでこのアルミニウム板を25℃、１％のアルキ
ル基を有するシランカップリング剤（東レシリコン
（株）製、AY−43−004（ジメチルジメトキシシラン
（（CH3）2Si（OCH3）２）））メタノール溶液に20分間
浸漬した後、120℃、15分間の温風乾燥による熱処理を
施してアルミニウム板を得た。(Example) Example 1 An aluminum plate (JIS2011) was immersed in a 1% triethanolamine aqueous solution at 95 ° C or higher for 20 minutes for boehmite treatment, and then this aluminum plate was 25 ° C and 1% silane having an alkyl group. coupling agent (E Reshirikon Co., AY-43-004 (dimethyldimethoxysilane ((CH 3) 2 Si ( OCH 3) 2))) was dipped for 20 minutes in a methanol solution, 120 ° C., for 15 minutes An aluminum plate was obtained by performing heat treatment by drying with warm air.
実施例２ 実施例１におけるアルミニウム板をJIS1070とし、また
シランカップリング剤をアルキル基を有するシランカッ
プリング剤（東レシリコン（株）製、AY−43−064）と
した以外は全て実施例１と同様になしたものを実施例２
とした。尚、AY−43−064は、2,4,6,8−テトラメチル−
ビス（２−トリメトキシシリルエチル）−ビス（３−０
−ヒドロキシフェニルプロピル）−シクロテトラシロキ
サンであり、以下の構造式を示す。Example 2 Except that the aluminum plate in Example 1 was JIS 1070 and the silane coupling agent was a silane coupling agent having an alkyl group (AY-43-064 manufactured by Toray Silicon Co., Ltd.), Example 2 made in the same manner
And Incidentally, AY-43-064 is 2,4,6,8-tetramethyl-
Bis (2-trimethoxysilylethyl) -bis (3-0
-Hydroxyphenylpropyl) -cyclotetrasiloxane, which has the following structural formula.
比較例１ アルミニウム板（JIS2011）を95℃以上の１％トリエタ
ノールアミン水溶液に20分間浸漬してベーマイト処理を
施し、アルミニウム板を得た。 Comparative Example 1 An aluminum plate (JIS2011) was immersed in a 1% triethanolamine aqueous solution at 95 ° C. or higher for 20 minutes for boehmite treatment to obtain an aluminum plate.
比較例２ アルミニウム板（JIS2011）を30℃のCrO3を4.0（g/
）、Na2Cr2O7を3.0（g/）、NaFを0.8（g/）から
なる溶液に１分間浸漬してクロメート処理を施し、アル
ミニウム板を得た。Comparative Example 2 Aluminum plate (JIS2011) was added with CrO 3 at 30 ° C at 4.0 (g /
), Na 2 Cr 2 O 7 was 3.0 (g /) and NaF was 0.8 (g /) in a solution for 1 minute for chromate treatment to obtain an aluminum plate.
以上実施例１、２、比較例１、２で得られたアルミニウ
ム板について耐食性を試験を行い、その結果を下記表−
１に示す。The aluminum plates obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were tested for corrosion resistance, and the results are shown in the table below.
Shown in 1.
以上述べた如く本発明によると、化学処理自体の長所を
生かしながらも従来のアルミニウムにおける化学的酸化
皮膜では得ることのできなかった優れた、しかも経時的
にも安定した耐食性が付与できるもので、各種建材、家
具、装飾品、筆記具など巾広い用途に利用可能なものと
なる。 As described above, according to the present invention, while utilizing the advantages of the chemical treatment itself, it is possible to impart excellent corrosion resistance which could not be obtained by the conventional chemical oxide film on aluminum, and moreover, stable corrosion resistance over time, It can be used for a wide range of purposes such as various building materials, furniture, ornaments, and writing instruments.
Claims (1)
合金表面に、化学的に酸化皮膜を形成し、次いで該酸化
皮膜を、加水分解可能な官能基と、アルキル基よりなる
疎水基とを有するシラン系カップリング剤にて処理し、
基材側の皮膜はSi−Ｏの共有結合を生じさせ、最表面の
皮膜はアルキル基を配するようにしてなることを特徴と
するアルミニウムまたはアルミニウム合金の表面処理
法。1. A silane-based cup having a chemically oxidized film formed on the surface of an aluminum or aluminum alloy as a base material, and the oxidized film having a hydrolyzable functional group and a hydrophobic group consisting of an alkyl group. Treated with a ring agent,
A surface treatment method for aluminum or an aluminum alloy, wherein the film on the base material side forms a covalent bond of Si-O, and the film on the outermost surface is arranged to have an alkyl group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17356184A JPH0791659B2 (en) | 1984-08-21 | 1984-08-21 | Surface treatment of aluminum or aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17356184A JPH0791659B2 (en) | 1984-08-21 | 1984-08-21 | Surface treatment of aluminum or aluminum alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152369A JPS6152369A (en) | 1986-03-15 |
| JPH0791659B2 true JPH0791659B2 (en) | 1995-10-04 |
Family
ID=15962832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17356184A Expired - Fee Related JPH0791659B2 (en) | 1984-08-21 | 1984-08-21 | Surface treatment of aluminum or aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791659B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5372983B2 (en) * | 2011-02-16 | 2013-12-18 | 株式会社日立製作所 | How to prevent metal corrosion |
| CN115652389A (en) * | 2022-10-18 | 2023-01-31 | 合肥三林科技有限公司 | Corrosion-resistant aluminum alloy and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5124292B2 (en) | 2008-01-10 | 2013-01-23 | ルネサスエレクトロニクス株式会社 | Power switch circuit |
-
1984
- 1984-08-21 JP JP17356184A patent/JPH0791659B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5124292B2 (en) | 2008-01-10 | 2013-01-23 | ルネサスエレクトロニクス株式会社 | Power switch circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6152369A (en) | 1986-03-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |