Etch solution and associated process for removal of protective m

Details Etch solution and associated process for removal of protective m Etch solution and associated process for removal of protective m

1992-06-16

1993-09-28

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156656, 156664, 252 794, 134 3, B44C 122, C23F 100

Patent

active

052483819

ABSTRACT:
An etch solution for the removal of metallic layers, which provide protection against corrosion by hot gases, and of deposits resulting from hot gas reactions on turbine blades in power units comprising a salt solution and an inhibitor. The salt solution consists of a hydrogen sulfate in the amount of 5 to 45% by weight and the inhibitor is present in the amount of 0.5 to 10% by weight. The total amount of the hydrogen sulfate and inhibitor is present with at least 50% by weight of water based on the total etch solution. Using this etch solution, layers preferably comprising MCrAlY are removed from turbine blades comprised of alloys of Ti, Co or Ni.

REFERENCES:
patent: 4302246 (1981-11-01), Brindisi et al.
patent: 4425185 (1984-01-01), Fishter et al.
patent: 4525250 (1985-06-01), Fahrmbacher-Lutz
patent: 4944807 (1990-07-01), Sova

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