Selectively stripping tin or tin lead alloys from copper...

Details Selectively stripping tin or tin lead alloys from copper... Selectively stripping tin or tin lead alloys from copper...

C - Chemistry, Metallurgy

09

K

149/14

C09K 13/06 (2006.01) C23F 1/44 (2006.01) H05K 3/06 (2006.01)

Patent

CA 1056701

ABSTRACT OF THE DISCLOSURE Acidic solutions for selectively stripping tin or tin- lead alloys from copper substrates comprising an aqueous solution of at least one nitro-substituted aromatic compound; an inorganic acid capable of readily reacting with tin and lead to form water- soluble salts thereof and incapable of reacting with tin and lead to form a water-insoluble compound film on the tin or tin-lead alloy surface, preferably fluoboric acid; a thiourea; an organic acid of the formula RCOOH wherein R is 1-2C alkyl or hydrogen; and a haloacetic acid wherein the halogen is chloro or bromo. The result in a pronounced synergism in accelerating the rate of stripping the tin or tin-lead alloy deposit from the copper substrate.

231484

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