Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1991-07-29
1992-09-01
Dixon, Jr., William R.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
427437, 4274431, 427 97, 427 98, 106 105, 205 85, C23C 1854, C23C 1848, C23C 1816
Patent
active
051435446
ABSTRACT:
An acid solution for displacement plating of a reflowable tin lead alloy having a melting point not exceeding 500.degree. F. over a cupreous surface. The displacement plating solution contains stannous ions in an amount of from 0.05 to 0.50 moles per liter, plumbous ions in an amount of from 0.01 to 0.15 moles per liter, a total content of stannous ions and plumbous ions in an amount of from 0.05 to 0.60 moles per liter and a ratio of stannous ions to plumbous ions varying from about 1.0:3.0 to 50.0:1.0. The solution is characterized by an ability to plate the tin lead alloy at a plating rate of at least 100 microinches per 15 minutes. The deposit obtained is capable of reflow and is useful in the manufacture of printed circuit boards.
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Dixon Jr. William R.
Goldberg Robert L.
Hertzog Scott L.
Shipley Company Inc.
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