| (19) |
 |
|
(11) |
EP 0 531 015 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
22.09.1993 Bulletin 1993/38 |
| (43) |
Date of publication A2: |
|
10.03.1993 Bulletin 1993/10 |
| (22) |
Date of filing: 18.08.1992 |
|
| (51) |
International Patent Classification (IPC)5: C25D 3/56 |
|
| (84) |
Designated Contracting States: |
|
DE FR |
| (30) |
Priority: |
19.08.1991 JP 232219/91
|
| (71) |
Applicant: YUKEN KOGYO KABUSHIKI KAISHA |
|
Kariya-shi,
Aichi-ken (JP) |
|
| (72) |
Inventors: |
|
- Wada, Nobuaki,
c/o Yuken Kogyo Kabushiki Kaisha
Kariya-shi,
Aichi-ken (JP)
- Ando, Shin,
c/o Yuken Kogyo Kabushiki Kaisha
Kariya-shi,
Aichi-ken (JP)
|
| (74) |
Representative: Cresswell, Thomas Anthony et al |
|
J.A. KEMP & CO.
14 South Square
Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB) |
|
| |
|
| (54) |
Zincate type zinc-iron alloy electroplating bath |
(57) A zincate type Zn-Fe alloy electroplating bath is disclosed which comprises a Zn
compound, an alkali hydroxide, a Fe(II, III) salt, a complexing agent for dissolving
the Fe(II, III) salt and a brightening agent. The brightening agent comprises a compound
obtainable by quaternizing a derivative of thiourea with an alkylating agent bearing
C₁-C₄ alkyl groups, and an alkylated polyalkylene polyamine obtainable by alkylating
one or more of the basic nitrogen atoms of a polyalkylene polyamine with an alkylating
agent bearing C₁-C₃ alkyl groups.