METHOD OF CONTROLLING WEAR OF COATS ON PARTS MADE FROM HEAT-RESISTANT NICKEL ALLOYS Russian patent published in 2012 - IPC B23P6/00 C25F3/02 C23F17/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, namely, to control over wear of coats on parts made from heat-resistant nickel alloys and may be used in repair of turbine vanes. Proposed method comprises preparing the surface of part with worn-out coat to define the degree of wear-out. Said preparation consists in electrolyte-plasma etching of part surface in water solutions of ammonium salts at voltage of 280-300 V between part and counter electrode and solution temperature of 75…85°C for 25…30 seconds. Note here that the degree of worn-out coat (□) is defined by the ratio of total area of processed surface with residues of coat (F_c) to total processed area (F) from formula □=F_c/F. Area F_c is defined from expression F_c =F-F_M, where F_M is area of sections with completely worn-out coat. Area F_M is defined as the sum of areas of surface processed sections (ΣF_i) with macrostructure exposed after etching by expression (ΣF_i) F_M =ΣF_i, where F_i is section with macrostructure exposed after etching by expression.

EFFECT: higher efficiency and validity of estimation.

4 cl, 1 ex