Method of removing oxide on a metal surface

An object bearing an oxide on the surface of a parent metal is immersed in a liquid containing a complexing agent. To prevent erosion of the parent metal by the liquid, electrons having energy levels on the base side with respect to the Fermi level of the oxide are generated outside the parent mater...

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Bibliographische Detailangaben
Hauptverfasser:	SAITO, MASAYUKI, KOBAYASHI, MASAHITO, FURUTANI, YASUMASA, SUMITA, OSAO, ITOU, HISAO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR 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 DECONTAMINATION ARRANGEMENTS THEREFOR DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE NUCLEAR ENGINEERING NUCLEAR PHYSICS PHYSICS PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT TREATING RADIOACTIVELY CONTAMINATED MATERIAL
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Beschreibung
Zusammenfassung:	An object bearing an oxide on the surface of a parent metal is immersed in a liquid containing a complexing agent. To prevent erosion of the parent metal by the liquid, electrons having energy levels on the base side with respect to the Fermi level of the oxide are generated outside the parent material metal by supplying external energy and are injected into the oxide while contacted by the liquid.The electrons can be generated by (a) cathodic polarization of the oxide, (b) adjustment of the oxidation reduction potential of a reducing agent in the liquid or (c) projecting radiation onto the oxide to obtain electrons in high energy levels. Case (a) is illustrated, the oxide-bearing object 26 being connected to a potentiostat 30 and immersed in a liquid 21 also containing an anode 22.