Национальный Технический Университет «Харьковский Политехнический Институт»
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A method for removal of the copper coating from a dielectric by anodal dissolution in the electrolyte which contains copper tetra fluoroborate and pyrophosphate, boric and pyrophosphoric acids. Water-line of details from dielectric with the copper coating is closed by the strip of clad dielectric material with a copper layer to the detail. Coating is processed anodically in an electrolyte at constant voltage on electrolyzer to the decrease of current strength, then in the trapping bath of this electrolyte, in which рН is hold up of 8.0-9.0, with initial anodal density of current of 200-300 A/m, including the stage of decrease of current strength, and then chemically in solution which contains 20-70 g/mof pyrophosphoric acid and 2-6 g/dmof hydrogen peroxide.
UAU200804927U2008-04-162008-04-16METHOD For REMOVAL OF COPPER COATING FROM DIELECTRIC
UA36721U
(en)
METHODS OF MICROPOLISHING A SURFACE FROM A NON-FERROUS METAL WORK AND REMOVING SUBSTANTIALLY UNIFORM CONTROLLED SURFACE MATERIAL ON A NON-FERROUS METAL WORK PIECE