Abstract:
A high-speed electrolytic copper plating bath containing an aqueous solution of copper fluoborate and fluoboric acid, and optionally, an alkali metal fluoride and a surface active agent is disclosed. With this bath, a smooth and ductile copper layer can be substantially evenly deposited onto the surfaces of an apertured object such as a printed circuit board.
Abstract:
A liquid composition for stripping resin coatings such as epoxy embedment or conformal coatings from substrates such as printed circuit boards. The composition is a substantially anhydrous combination of organic liquids comprising on a volume basis above about 60 percent of a halogenated hydrocarbon liquid, a minor amount below 12 percent but above 4 percent of an alcohol and below 5 percent but at least 1 percent of a ketone. The resin coating is contacted with the composition for a period sufficient to loosen and solvate said resin. The removal of the softened resin may be facilitated by brushing.