Title:
PYROPHOSPHORIC ACID BATH FOR USE IN COPPER-TIN ALLOY PLATING
Document Type and Number:
WIPO Patent Application WO2004005528
Kind Code:
A3
Abstract:
The invention relates to a pyrophosphoric acid bath for use in cyanogen-free copper-tin alloy plating that contains an additive (A) composed an amine derivative, an epihalohydrin and a glycidyl ether compound with ratios of epihalohydrin to glycidyl ether compound being 0.5-2 to 0.1-5 on mol basis, per 1 mol of the amine derivative, has a pH of 3 to 9, and optionally contains an additive (B) composed of an organic sulfonic acid and/or an organic sulfonic acid salt, and to a copper-tin alloy coating obtainable by using the bath. The invention provides a pyrophosphoric acid bath for use in copper-tin alloy plating of the cyanogen-free type utilizable on an industrial scale, particularly, capable of performing uniform treatment to exhibit low defective product generation rates even with the current density being incessantly changing between a high state and a low state, as a barrel plating method, and a copper-tin alloy coating obtainable by using the bath.
Inventors:
URATA KAZUYA (JP)
TACHIBANA KUNIO (JP)
ONIWA NAOYUKI (JP)
TAJIMA MIKIYA (JP)
OGAWA YUKIO (JP)
TACHIBANA KUNIO (JP)
ONIWA NAOYUKI (JP)
TAJIMA MIKIYA (JP)
OGAWA YUKIO (JP)
Application Number:
PCT/JP2003/006262
Publication Date:
April 14, 2005
Filing Date:
May 20, 2003
Export Citation:
Assignee:
NIHON NEW CHROME CO LTD (JP)
URATA KAZUYA (JP)
TACHIBANA KUNIO (JP)
ONIWA NAOYUKI (JP)
TAJIMA MIKIYA (JP)
OGAWA YUKIO (JP)
URATA KAZUYA (JP)
TACHIBANA KUNIO (JP)
ONIWA NAOYUKI (JP)
TAJIMA MIKIYA (JP)
OGAWA YUKIO (JP)
International Classes:
C25D3/58; C25D3/56; (IPC1-7): C25D3/58
Foreign References:
| EP1146148A2 | 2001-10-17 | |||
| US3945894A | 1976-03-23 | |||
| EP1099780A2 | 2001-05-16 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 09 31 July 1998 (1998-07-31)
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