Patent ID: 9238093
Filing Date: 2016-01-19
CPC Classification: A61L,B23H,C23F

Claim Text:
1. A process comprising the steps: providing a wire electric discharge machined (WEDM) part with a copper and zinc recast layer or copper and zinc splatter from the WEDM machining; contacting the WEDM part with the copper and zinc recast layer or copper and zinc splatter with a treatment solution comprising an aqueous solution of 1-3 volume percent hydrofluoric acid and 20-40 volume percent nitric acid to remove the copper and zinc recast layer or copper and zinc splatter, providing a treated WEDM part devoid of a copper and zinc recast layer or copper and zinc splatter; wherein the copper and zinc recast layer or splatter is removed from the underlying part surface, wherein pitting of the surface is 3 or less pits per 200 square microns, wherein the WEDM part comprises one of titanium, molybdenum, niobium, zirconium, tantalum, aluminum, vanadium or mixtures thereof, and wherein the recast layer further comprises one of the corresponding titanium, molybdenum, niobium, zirconium, tantalum, aluminum, vanadium or mixtures thereof from the WEDM part.