JPH0571678B2 - - Google Patents
Info
- Publication number
- JPH0571678B2 JPH0571678B2 JP12512485A JP12512485A JPH0571678B2 JP H0571678 B2 JPH0571678 B2 JP H0571678B2 JP 12512485 A JP12512485 A JP 12512485A JP 12512485 A JP12512485 A JP 12512485A JP H0571678 B2 JPH0571678 B2 JP H0571678B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- sulfuric acid
- hydroxyquinoline
- bath
- anodizing
- 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
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000007743 anodising Methods 0.000 claims description 10
- 239000005725 8-Hydroxyquinoline Substances 0.000 claims description 7
- 229960003540 oxyquinoline Drugs 0.000 claims description 7
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 239000002075 main ingredient Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910007981 Si-Mg Inorganic materials 0.000 description 2
- 229910008316 Si—Mg Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Electrochemical Coating By Surface Reaction (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
〔産業上の利用分野〕
本発明はアルミニウム又はその合金を用いた製
品の表面処理に適用される陽極酸化処理法に関す
る。
〔従来の技術〕
硫酸浴を用いたアルミニウムの陽極酸化処理法
は、純度の高いもの（例えばJIS A1050、
A1100）には均一で耐食性の高い皮膜を生成させ
ることが可能である。この処理を行うには先ず被
処理物に適当な前処理（例えば洗浄、脱脂）を行
い次いでこのものを陽極とし、他の溶解減耗しな
い金属（例えば黒鉛、ニツケル）を陰極とし、硫
酸水溶液中で電流を通じ酸化皮膜を生成させる。
〔発明が解決しようとする問題点〕
従来の技術では、純アルミニウム及びアルミニ
ウム合金展伸材に適用する限り良好な皮膜を生成
させることができるが、アルミニウム鋳物用合金
（例えばAl−Si系、Al−Si−Mg系など）に同様
の処理を行つても皮膜が均一に生成せず、ほとん
どは表面における金属学的組織の影響（例えばSi
の偏析など）を受け、微視的なアルミニウム含有
量の多少により、処理皮膜が凹凸になることが多
い。
本発明は上記した従来法のような欠点のないア
ルミニウムの陽極酸化処理法を提供しようとする
ものである。
〔問題点を解決するための手段〕
本発明者らは、上記問題を解決するためアルミ
ニウム陽極酸化処理浴を改良することを試み、特
に硫酸水溶液を主体とした最も一般的な陽極酸化
処理浴に添加剤として微量もしくは少量の８−ヒ
ドロキシキノリンを添加することによつて問題を
解決しうることを確認した。
すなわち本発明は硫酸を主体とした、アルミニ
ウムの陽極酸化処理浴に８−ヒドロキシノリンを
加えたものを用いることを特徴とするアルミニウ
ム陽極酸化処理法である。
本発明のアルミニウムの陽極酸化処理浴は、硫
酸0.1〜3.0mol／、好ましくは09〜2.3mol／、
中に、８−ヒドロキシキノリンを0.01ｇ〜飽和
量、好ましくは0.5〜40ｇ、添加溶解させてなる
ものである。そしてこの浴中で0.5〜3.0A／ｄm2、
好ましくは0.3〜2.0A／ｄm2の電流密度で陽極酸
化を行えば、各種アルミニウム合金に良好な陽極
酸化皮膜を生成させることができる。
以下、本発明を実施例をあげて更に詳述する。
実施例 １
硫酸0.9mol／、８−ヒドロキシキノリン５
ｇ／からなる処理浴を用い、黒鉛を陰極とし浴
温５℃、電流密度1.2A／ｄm2でJIS A1050材と
JIS A3003材とJIS A4004材でろう付けした試験
品を１時間陽極酸化した。
実施例 ２
硫酸2.3mol／、８−ヒドロキシキノリン５
ｇ／からなる処理浴を用い、黒鉛を陰極とし浴
温５℃、電流密度1.2A／ｄm2でJIS A1050材上に
JIS A4004材を真空中で溶融させた後冷却させた
試験品を１時間陽極酸化した。
実施例 ３
硫酸1.5mol／、８−ヒドロキシキノリン10
ｇ／からなる処理浴を用い、黒鉛を陰極とし、
浴温８℃電流密度1.0A／ｄm2で鋳造用アルミニ
ウム合金AC8Aからなる試験品を１時間陽極酸化
した。
比較例 １〜３
前記実施例の有意性を見るために、８−ヒドロ
キシキノリンを添加しない条件で比較例１〜３を
行つた。
以上の結果を表１に示す。
[Industrial Application Field] The present invention relates to an anodizing treatment method applied to surface treatment of products using aluminum or its alloy. [Prior art] The anodizing method for aluminum using a sulfuric acid bath is based on highly pure aluminum (e.g. JIS A1050,
A1100), it is possible to produce a uniform and highly corrosion-resistant film. To carry out this treatment, the object to be treated is first subjected to appropriate pretreatment (e.g., cleaning, degreasing), then this object is used as an anode, another metal that does not dissolve and deteriorate (e.g., graphite, nickel) is used as a cathode, and the object is placed in a sulfuric acid aqueous solution. Generates an oxide film by passing an electric current. [Problems to be Solved by the Invention] Conventional techniques can produce good films as long as they are applied to pure aluminum and aluminum alloy wrought materials. -Si-Mg system, etc.), the film does not form uniformly, and most of the time it is due to the influence of the metallurgical structure on the surface (e.g. Si-Mg system).
(segregation, etc.), and the treated film often becomes uneven depending on the microscopic aluminum content. The present invention aims to provide a method for anodizing aluminum that does not have the drawbacks of the conventional methods described above. [Means for Solving the Problems] In order to solve the above problems, the present inventors attempted to improve the aluminum anodizing bath, and in particular, improved the most common anodizing bath mainly containing a sulfuric acid aqueous solution. It was confirmed that the problem could be solved by adding a trace or small amount of 8-hydroxyquinoline as an additive. That is, the present invention is an aluminum anodizing method characterized by using an aluminum anodizing bath containing sulfuric acid as a main ingredient to which 8-hydroxynoline is added. The aluminum anodizing treatment bath of the present invention contains sulfuric acid 0.1 to 3.0 mol/, preferably 09 to 2.3 mol/,
0.01 g to saturation amount, preferably 0.5 to 40 g, of 8-hydroxyquinoline is added and dissolved therein. In this bath, 0.5 to 3.0 A/dm 2 ,
If anodization is preferably performed at a current density of 0.3 to 2.0 A/dm 2 , a good anodic oxide film can be formed on various aluminum alloys. Hereinafter, the present invention will be explained in further detail by giving examples. Example 1 Sulfuric acid 0.9 mol/, 8-hydroxyquinoline 5
JIS A1050 material using a treatment bath consisting of
A test piece made of JIS A3003 material and JIS A4004 material was anodized for 1 hour. Example 2 Sulfuric acid 2.3 mol/, 8-hydroxyquinoline 5
Using a treatment bath consisting of
JIS A4004 material was melted in vacuum and then cooled, and the test piece was anodized for 1 hour. Example 3 Sulfuric acid 1.5 mol/8-hydroxyquinoline 10
Using a treatment bath consisting of
A test piece made of an aluminum alloy AC8A for casting was anodized for 1 hour at a bath temperature of 8° C. and a current density of 1.0 A/dm 2 . Comparative Examples 1 to 3 In order to examine the significance of the above Examples, Comparative Examples 1 to 3 were conducted without adding 8-hydroxyquinoline. The above results are shown in Table 1.
本発明による効果は上記のように純アルミニウ
ム部分に付着する酸化皮膜の生成量を減らすこ
と、即ち電流の集中を防ぐことにより、Al−Si
系合金部に電流を集めこの部分の酸化皮膜の生成
量を増すことによつて実現されることが確認され
た。
As mentioned above, the effect of the present invention is to reduce the amount of oxide film that adheres to pure aluminum parts, that is, by preventing current concentration, Al-Si
It was confirmed that this can be achieved by collecting current in the system alloy part and increasing the amount of oxide film formed in this part.
Claims (1)
処理浴に８−ヒドロキシキノリンを加えたものを
用いることを特徴とするアルミニウム陽極酸化処
理法。1. An aluminum anodizing method characterized by using an aluminum anodizing bath containing sulfuric acid as a main ingredient to which 8-hydroxyquinoline is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12512485A JPS61284598A (en) | 1985-06-11 | 1985-06-11 | Method for anodically oxidizing aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12512485A JPS61284598A (en) | 1985-06-11 | 1985-06-11 | Method for anodically oxidizing aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61284598A JPS61284598A (en) | 1986-12-15 |
| JPH0571678B2 true JPH0571678B2 (en) | 1993-10-07 |
Family
ID=14902439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12512485A Granted JPS61284598A (en) | 1985-06-11 | 1985-06-11 | Method for anodically oxidizing aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61284598A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0778280B2 (en) * | 1988-07-28 | 1995-08-23 | 株式会社日立製作所 | Metal anti-corrosion surface treatment method |
| JPH0768638B2 (en) * | 1988-11-02 | 1995-07-26 | 株式会社日立製作所 | Metal anti-corrosion surface treatment method |
| CN119507007A (en) * | 2024-11-28 | 2025-02-25 | 八达新材料有限公司 | High corrosion resistant sealing liquid for transparent conductive oxide film of aluminum alloy and preparation method and application thereof |
-
1985
- 1985-06-11 JP JP12512485A patent/JPS61284598A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61284598A (en) | 1986-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |