Process for chemically stripping a surface-protection layer with a high chromium content from the main body of a component composed of a nickel-based or cobalt-based superalloy
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United States of America Patent
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Jul 31, 1990
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N/A
app pub date -
Nov 30, 1988
filing date -
Dec 1, 1987
priority date (Note) -
Expired
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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: 200-400 gl: FeCl.sub.3 . 6H.sub.2 O 0.5-5 gl: CuCl.sub.2 . 2H.sub.2 O 10-20 m/l: Glycerol 120-200 m/l: Concentrated HCl Remainder: H.sub.2 O
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