Methods and compositions for cleaning metal

Metals such as Ti and its alloys, stainless steel and "superalloys" are cleaned by immersion in a fused salt bath consisting by weight of: .9-15%.NaNO3, .5-15%.NaCl .8-20%.KoH .50-78%.NaOH the weight ratio of KoH: NaOH being from 0.1 to 0.4. Following immersion in the salt bath the metal i...

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Bibliographische Detailangaben
Hauptverfasser:	SHOEMAKER ROBERT HAROLD, GESCHWENDER HAROLD
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY
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Beschreibung
Zusammenfassung:	Metals such as Ti and its alloys, stainless steel and "superalloys" are cleaned by immersion in a fused salt bath consisting by weight of: .9-15%.NaNO3, .5-15%.NaCl .8-20%.KoH .50-78%.NaOH the weight ratio of KoH: NaOH being from 0.1 to 0.4. Following immersion in the salt bath the metal is washed with water and pickled in dilute acid such as H2SO4, HCl, HNO3, HF. Treatment in the fused salt bath may be carried out below 900 DEG F. e.g. 700 DEG -800 DEG F. or above 1000 DEG F. The treatment removes glass films on the metal as well as oxides.