Method for cleaning metal parts

Details Method for cleaning metal parts Method for cleaning metal parts

1980-02-06

1982-04-13

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 11, 134 19, 134 31, 134 37, 228206, B08B 500

Patent

active

043245943

ABSTRACT:
The method for cleaning metal parts, particularly crack damaged gamma prime hardened nickel alloy parts but also including stainless steels, superalloys, and solid solution superalloys in order to render them brazable or otherwise bondable. The method makes use of elemental fluorine as the primary cleaning material. A reducing gas such as hydrogen may be present. The preferred source of elemental fluorine is by thermal decomposition of a fluorocarbon resin. The cleaned part has a surface layer free of oxides and depleted of aluminum and titanium. It is brazable.

REFERENCES:
patent: 2571328 (1951-10-01), Baker
patent: 2585819 (1952-02-01), Moore et al.
patent: 2851387 (1958-09-01), Low
patent: 4188237 (1980-02-01), Chasteen
"Brazing Stainless Steel in a Stable Reducing Atmosphere of Fluoride", AWS Conference (Philadelphia, Pa.--Apr. 1977).
Watson et al., Bureau of Mines (Report 4756), "Decomposition Temperatures of . . . as Indicated by Halogen Liberation", Dec. 1950.

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