Method for cleaning metal parts

Details Method for cleaning metal parts Method for cleaning metal parts

1981-10-26

1983-09-20

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

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

134 19, 134 31, 228206, B08B 500, C23G 500

Patent

active

044053797

ABSTRACT:
A 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 a C-O-H-F atmosphere as the primary cleaning material wherein the atmosphere has an H/O ratio of 10.sup.4 or greater, and a C/F ratio of approximately 0.01 to less than 2.0. The preferred source of the C-O-H-F atmosphere is thermal decomposition of a fluorocarbon resin and a low moisture containing hydrogen gas although sources other than fluorocarbon resins are also disclosed.

REFERENCES:
patent: 2571328 (1951-10-01), Baker
patent: 2585819 (1952-02-01), Moore et al.
patent: 2851387 (1958-09-01), Low
patent: 4098450 (1978-07-01), Keller et al.
"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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