Ryutaro Fujisawa

Corrosion Behavior of Nickel-Based Alloys and Type 316 Stainless Steel in Slightly Oxidizing or Reducing Supercritical Water

Abstract The objectives of this study were to evaluate the corrosion behavior of candidate corrosion-resistant alloys in slightly oxidizing or reducing supercritical water (SCW) environments contai...

Cathodic protection for nuclear waste packaging under gamma ray irradiation by using TiO{sub 2} coating combined with glass scintillators

The photoelectrochemical behaviors of a TiO{sub 2} single crystal and TiO{sub 2} coating were studied, for the purposes of cathodic protection of stainless steels and Cu via the TiO{sub 2} coating combined with glass scintillators under gamma ray irradiation. It was confirmed that a TiO{sub 2} coating could protect 304 stainless steel cathodically from crevice corrosion under illumination. A logarithmic relationship between the photopotential of single crystal TiO{sub 2} (rutile) and light intensity was found, moreover, the photopotential was found to be least noble when wavelength equals 375 nm. Under illumination by gamma rays combined with the glass scintillators, the electrode potential of single crystal TiO{sub 2} was found to shift in the less noble direction by about 200 mV. Therefore, the technique of cathodic protection by TiO{sub 2} coating is considered to be applicable to protect the packaging metal from corrosion for a long time.