Chemical milling of niobium

Details Chemical milling of niobium Chemical milling of niobium

1991-12-31

1993-04-13

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

252 793, 252 794, B44C 122, C23F 100

Patent

active

052019977

ABSTRACT:
A solution is described for the chemical milling of niobium and niobium-base alloys. The solution contains about 25% HNO.sub.3, about 19% HF, balance H.sub.2 O, with additions of citric acid and ammonium formate to control the reaction rate and provide a smooth surface finish without intergranular attack, and a small amount of a noble metal to control hydrogen absorption. A process for using the solution to mill niobium alloys is also described.

REFERENCES:
patent: 3844859 (1974-10-01), Roni
patent: 4080226 (1978-03-01), Suzuki
patent: 4243476 (1981-01-01), Ahn
patent: 4950359 (1990-08-01), Parissis

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