Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly alloy coating
Patent
1997-11-24
2000-08-08
Mayekar, K.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly alloy coating
205254, 205238, 106 123, 106 126, C25D 356
Patent
active
060997133
ABSTRACT:
Disclosed is a tin-silver alloy electroplating bath containing: (A) stannous salt; (B) silver salt; (C) one kind or two or more kinds of acids selected from the group consisting of sulfuric acid, phosphoric acid, phosphonic acid, hydroxycarboxylic acid, alkanesulfonic acid, and alkanolsulfonic acid; (D) thiourea; (E) nonionic surface active agent; and (F) one kind or two or more kinds of additives selected from the group consisting of a mercapto group containing aromatic compound, dioxyaromatic compound, and unsaturated carboxylic acid. The electroplating using the above electroplating bath is allowed to form a homogeneous tin-silver alloy plated film having a good external appearance by eliminating preferential deposition of silver and substitutional deposition of silver on an anode and the plated film.
REFERENCES:
patent: 4246077 (1981-01-01), Hradil et al.
Tsujimoto Masanobu
Yanada Isamu
C. Uyemura & Co., Ltd.
Mayekar K.
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