Role of dissolved hydrogen in water in corrosion of alloy 600 in high temperature water

Qunjia Peng, Tetsuo Shoji, Juan Hou, Kazuhiko Sakaguchi, Yoichi Takeda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Characterization of the microstructure and chemical composition of oxide films formed on Alloy 600 in high temperature water with various dissolved hydrogen (DH) levels that allowed the Ni/NiO phase transition to occur were conducted. The results showed that increasing DH in water decreased the thickness of the oxide film, in conjunction with the increase of Cr- but decrease of Ni-concentrations in the oxide film. Further, it was found that the DH deteriorated the stability and protectiveness of the oxide film for values of DH up to and slightly above the Ni/NiO transition value. The DH effect was attributed to an oxidative dissolution process of Ni following the reduction of Ni in the oxide by hydrogen, which suggests the corrosion of Ni-base alloys in high temperature hydrogenated water is dominated by a synergic process of dissolution and oxidation.

Original languageEnglish
Title of host publication15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
Pages1779-1788
Number of pages10
Publication statusPublished - 2011 Dec 1
Event15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011 - Colorado Springs, CO, United States
Duration: 2011 Aug 72011 Aug 11

Publication series

Name15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
Volume3

Other

Other15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011
CountryUnited States
CityColorado Springs, CO
Period11/8/711/8/11

Keywords

  • Alloy 600
  • Corrosion
  • Dissolved hydrogen
  • High temperature water

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Pollution

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  • Cite this

    Peng, Q., Shoji, T., Hou, J., Sakaguchi, K., & Takeda, Y. (2011). Role of dissolved hydrogen in water in corrosion of alloy 600 in high temperature water. In 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011 (pp. 1779-1788). (15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011; Vol. 3).