| (19) |
 |
|
(11) |
EP 1 126 048 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.05.2003 Bulletin 2003/18 |
| (43) |
Date of publication A2: |
|
22.08.2001 Bulletin 2001/34 |
| (22) |
Date of filing: 15.02.2001 |
|
| (51) |
International Patent Classification (IPC)7: C23G 1/12 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
15.02.2000 JP 2000036022
|
| (71) |
Applicant: Nippon Paint Co., Ltd. |
|
Osaka-shi, Osaka 531-0077 (JP) |
|
| (72) |
Inventors: |
|
- Ikeda, Satoshi
Yamato-shi, Kanagawa 242-0021 (JP)
- Kamimura, Masayuki
Ichikawa-shi, Chiba 272-0025 (JP)
- Sonomura, Kazuo
Katsushika-ku, Tokyo 125-0041 (JP)
|
| (74) |
Representative: Forstmeyer, Dietmar, Dr. rer. nat., Dipl.-Chem. |
|
Boeters & Bauer, Bereiteranger 15
81541 München
81541 München (DE) |
|
| |
|
| (54) |
Pickling kit for aluminum substrates and method of pickling |
(57) The present invention provides a pickling method for aluminum substrate
- which comprises supplementing, in the course of pickling of an aluminum substrate,
a pickling agent with a solution (A) and a solution (B)
- to thereby uphold the formulated components within the above concentration ranges,
- said pickling agent containing 3000 to 50000 ppm of sulfuric acid, 100 to 5000 ppm
of a surfactant, 50 to 3000 ppm of an oxidized metal ion or anion and 100 to 5000
ppm of nitric acid,
- said solution (A) containing 30 to 500 mass parts of sulfuric acid, 1 to 50 mass parts
of a surfactant, 0.5 to 30 mass parts of an oxidized metal ion or anion and 30 to
500 parts of water, and
- said solution (B) containing 0.5 to 30 mass parts of nitric acid, 0.5 to 30 mass parts
of an oxidizing agent and 10 to 300 mass parts of water.