PROCESS OF MICROPLASMA ELECTROLYTIC MACHINING OF SURFACE OF CURRENT-CONDUCTING MATERIALS Russian patent published in 2000 - IPC

FIELD: electrochemistry. SUBSTANCE: process of microplasma electrolytic machining of surface of current-conducting material involves formation of contact of current conducting material used as first electrode and of second electrode with electrolyte, application of voltage between electrodes to initiate aggregate of microplasma discharges and its subsequent holding under specified electrolytic parameters till coat of specified thickness is produced. First area of material SH=N/A.i, where SH is measured in sq.dm; N is output power of current source, VA; A is empirical parameter equal to 550... 5000 B; i is minimal density of current of stable process, A/sq.dm; is submerged in electrolyte. Material is submerged completely when current between electrodes is 0.91 <[(t) <1.1], then electric mode with voltage of 200... 1000 V with various variable forms and value of current is set. In this case ratio of cathode and anode currents under stabilized voltage is set equal to 0. . .1.3 till coat with thickness close to specified one is deposited, then alternating current with duration of anode pulse or burst of anode pulses not more than 0.04 c is transmitted. Length of pauses between anode pulses or bursts of anode pulses which are no-current conditions are filled with cathode pulses partially or completely whose duration is longer than that of anode pulses or burst of anode pulses. Then voltage is stepped down stepwise to produce coat of minimal through porosity and of uniform thickness. EFFECT: deposition of high-quality uniform heat-, corrosion-, wear-resistant coats with thickness up to 700 μm while machining large-sized or great number of small parts. 3 cl, 5 dwg, 2 tbl