| 摘要 |
PROBLEM TO BE SOLVED: To prevent the adhesion of a radioactive material to a stainless steel member by depositing a Cr concentrated layer on the surface of a stainless steel member in contact with nuclear reactor cooling water containing a radio active material by primary treatment and thereafter depositing an Fe-Ni concen trated layer on the outside of the Cr concentrated layer by secondary treatment. SOLUTION: By electrolytic polishing and chemical polishing in which Fe in a base material is selectively eluted to relatively increase the concentration of Cr in the surface, a Cr concentrated layer 12 is formed on the surface of a constituting member 11 for a nuclear power plant Also, by heat tretment at >=700 deg.C, the diffusing rate of Cr is made higher than of Fe and Ni, and Cr is concentrated on the surface to deposit the Cr concentrated layer 12. Chromate treatment, electrolytic treatment, chemical vapor deposition, sputtering or the other similar methods are suitable for depositing the Cr concentrated layer 12. Next, by executing heating treatment at <=500 deg.C, two layer oxide in which the external layer is composed of an Fe-Ni concentrated layer 13, and the internal layer is composed of the Cr concentrated layer 12 is deposited, so that the corrosion of the constituting member 11 can be prevented.
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