Cleaning of metal articles

Details Cleaning of metal articles Cleaning of metal articles

1986-08-29

1987-10-06

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 2, 134 21, 134 30, 134 34, 134102, 156626, 156651, 156664, 156667, 156345, B44C 122, C23F 100, C05C 1500, C05C 2506

Patent

active

046981306

ABSTRACT:
A halide based process for the removal of surface oxidation and corrosion contamination from metallic articles especially cracked superalloy turbine components, which utilizes a pulsed pressure cycle. Preferably the cycle is established by alternate evacuation and replenishment. A cycle operating at 150 torr or less and utilizing CHF.sub.3 hydrogen and inert gas as atmosphere is described. The evacuation phase of each cycle should preferably reach 20 torr or less. The process is also applicable to etching for detection of near-surface flaws.

REFERENCES:
patent: 3205105 (1965-09-01), Oster
patent: 4159917 (1979-07-01), Gluck
patent: 4551434 (1985-11-01), Thoma
patent: 4605479 (1986-08-01), Faith

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