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

1989-03-30

1990-11-13

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427 96, C23C 2200

Patent

active

049699580

ABSTRACT:
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.

REFERENCES:
patent: 4409037 (1983-10-01), Landau
patent: 4512818 (1985-04-01), Valayil
K. Nargi, PC Fab, (Jun. 1985), 90-95.

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