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    • 4. 发明授权
    • Silver and silver alloy plating bath
    • 银和银合金电镀浴
    • US07628903B1
    • 2009-12-08
    • US09563479
    • 2000-05-02
    • Kiyotaka TsujiTetsuji NishikawaTakao TakeuchiKeigo ObataHidemi Nawafune
    • Kiyotaka TsujiTetsuji NishikawaTakao TakeuchiKeigo ObataHidemi Nawafune
    • C25D3/46C23C18/31
    • C25D3/46C25D3/64
    • A silver and silver alloy plating bath, includes (A) a soluble salt, having a silver salt or a mixture of a silver salt and a salt of a metal such as tin, bismuth, indium, lead, and the like; and (B) a particular aliphatic sulfide compound, such as thiobis(diethyleneglycol), dithiobis(triglycerol), 3,3′-thiodipropanol, thiodiglycerin, 3,6-dithiooctane-1,8-diol, and the like, which contain at least one or more of an ether oxygen atom, a 1-hydroxypropyl group, a hydroxypropylene group, or two or more of a sulfide bond in the molecule, and not containing a basic nitrogen atom. Compared to baths containing aliphatic monosulfide compounds, such as thiodiglycol or beta-thiodiglycol, which do not contain an ether oxygen atom, 1-hydroxypropyl group, a hydroxypropylene group, or two or more of a sulfide bond in the molecule, by having these particular compounds, the plating bath of the present invention has excellent stability over extended time, excellent co-deposition of silver and various metals, and excellent appearance of the electrodeposition coating.
    • 银和银合金电镀浴包括(A)可溶性盐,其具有银盐或银盐和金属如锡,铋,铟,铅等的盐的混合物; 和(B)特定的脂族硫醚化合物,例如硫代双(二甘醇),二硫代双(三甘油),3,3'-硫代二丙醇,硫二甘油,3,6-二硫辛烷-1,8-二醇等, 至少一个或多个醚氧原子,1-羟丙基,羟基亚丙基,或分子中的硫原子键中的两个或多个,并且不含碱性氮原子。 与分子中含有不含醚氧原子,1-羟丙基,羟基亚丙基或两个或多个硫键的脂族单硫醚化合物如硫二甘醇或β-硫二甘醇相比,具有这些特定 化合物,本发明的电镀浴在延长的时间内具有优异的稳定性,优异的银和各种金属的共沉积,以及优异的电沉积外观。