ELECTROLYTE FOR CHROMIUM-PLATING OF STEELS, COPPER AND TITANIUM ALLOYS Russian patent published in 2002 - IPC

FIELD: electroplating. SUBSTANCE: process is conducted in self-regulating electrolyte and may be used for coating parts in aircraft engineering, instrumentation engineering, and other technical areas, in particular in high-pressure hydraulic systems. Electrolyte contains, g/l: chromic anhydride 225-275; potassium fluorosilicate 15-25; strontium sulfate 4-8; IVB, VB, or VIB-group metal oxide powder 0.5-50; IVB, VB, or VIB-group metal carbide powder; and surfactant (chromoxane, chromine, and other) 0.1-1.0. Coatings thus obtained show microhardness up to 1400 kg/sq.mm and their porosity is 100-fold reduced as compared to standard porosity. EFFECT: improved strength and adhesion to surfaces of parts. 2 cl, 2 tbl, 3 ex