Electrolytic-plasma removal of two-layer coating SDP1 + VSDP20 from surface of high-pressure compressor blades of aircraft gas-turbine engines made fo EP718-ID alloy

This paper presents the results of selecting an electrolyte for removing a 2-layer ion plasma coating SDP1 + VSDP20 from a metal substrate made of EP718-ID alloy using the method of electrolyte plasma polishing. An aqueous solution of ammonium sulfate with the addition of ammonium citrate was used as a base solution for removing the coating. It was found that the addition of a fluoride ligand makes it possible to reduce the time of removal of the SDP1 + VSDP20 coating and improve the quality of the treated surface.