Process for preparing nonconductive substrates

Details Process for preparing nonconductive substrates Process for preparing nonconductive substrates

1990-06-01

1992-09-01

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating substrate prior to coating

205125, 205131, 205920, 156668, 427306, 427307, C25D 534

Patent

active

051435926

ABSTRACT:
Described herein is a process for desmearing and etching back the surface of a nonconductive substrate which comprises (a) contacting the substrate with a strong acid; (b) then contacting the substrate with an aqueous basic solution; and (c) contacting the substrate with a reducing agent dissolved in a strong acid.

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"Smear Removal Methods" by D. R. Witherell, Multilayer Printed Circuit Board Handbook, Electrochemical Publications Ltd., 1985, Chapter 11.

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