Process for chemically stripping a surface-protection layer with

Details Process for chemically stripping a surface-protection layer with Process for chemically stripping a surface-protection layer with

1988-11-30

1990-07-31

Lacey, David L.

Cleaning and liquid contact with solids

Processes

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

134 28, 134 41, 156656, 156664, 252 791, 252 792, 252 793, 252 794, C23G 104

Patent

active

049448072

ABSTRACT:
Process for stripping, by electroless chemical method, a surface-protection layer (3) with a high chromium content from the main body (2) of a component composed of a nickel-based or cobalt-based superalloy by immersion in a chloride solution (1) which does not release oxygen, which contains iron (III) and copper (II) and which contains still further additives, but no components of any kind which form chromium oxide. Temperature of the bath 50.degree. to 70.degree. C. Duration of residence of the component in the bath 10 to 150 h.
Typical bath composition:

REFERENCES:
patent: 3458353 (1969-07-01), Baldi
patent: 3562040 (1971-02-01), Garies
patent: 3607398 (1971-09-01), Lucas
patent: 3622391 (1971-11-01), Baldi
patent: 3833414 (1974-09-01), Grisik et al.
patent: 4244833 (1981-01-01), Tomaszewski
patent: 4339282 (1982-07-01), Lada et al.
patent: 4410396 (1983-10-01), Somers et al.
patent: 4425185 (1984-01-01), Fishter et al.
patent: 4554049 (1985-11-01), Bastenbeck
patent: 4747975 (1988-05-01), Ritter
Surface Treatment Technology Abstracts, vol. 29, No. 2, Mar. 1987, (Teddington, Middlesex, GB), O. A. Nazarov, et al.

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