Process and composition for forming black oxide layers

Details Process and composition for forming black oxide layers Process and composition for forming black oxide layers

C - Chemistry, Metallurgy

23

C

C23C 22/63 (2006.01) H05K 3/38 (2006.01) H05K 3/46 (2006.01)

Patent

CA 2050678

2050678 9012127 PCTABS00002 Black, brown, and red oxide layers having high adhesion and peel strength are formed on printed circuit boards by adding a suitable amphipathic anionic surfactant to standard oxidizing solutions. The oxide layers thus formed result in multilayer circuit boards having reduced tendency to delaminate.

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