Title:
REMOVING METHOD FOR OXIDE ON METALLIC SURFACE
Document Type and Number:
Japanese Patent JPS5837200
Kind Code:
A
Abstract:
PURPOSE:To dissolve away the oxide grown or stuck on the surface of a base metal and to suppress the corrosion of the base metal by bringing said oxide into contact with electrolytically reduced water particularly in the presence of gasesus H2. CONSTITUTION:The above-described oxide (alphaFe2O3 and Fe3O4) on the surface of a base metal consisting of Fe is brought into contact with electrolytically reduced water particularly under blowing of gaseous H2. As a result, the dissolution of the above-described oxide is accelerated and the corrosion and damage of the base metal are suppressed by the combination of decrease in the concn. of the dissolved O2 in the water on the cathode in the electrolytic cell and the dissolution of the gaseous H2. In other words, according to said method, the oxide is dissolved away without using chemical which may induce corrosion when allowed to remain after the treatment. Such method is adaptable to suppression of corrosion on the inside surfaces of the apparatus and pipings installed particularly in nuclear power plants, etc. in contacting with fluid.
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Inventors:
SUMIDA NOBUO
SAITOU TAKASHI
ITOU HISAO
KOBAYASHI MASATO
SAITOU TAKASHI
ITOU HISAO
KOBAYASHI MASATO
Application Number:
JP13272281A
Publication Date:
March 04, 1983
Filing Date:
August 26, 1981
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
C25F1/04; C25F1/00; G21F9/28; (IPC1-7): C25F1/00
Attorney, Agent or Firm:
Akio Takahashi