Effects of Chromium and Molybdenum on Hydrogen Absorption Behavior in Iron

  • Vanadia Irisca YussallaEmail author
  • Tomohiko Omura
  • Kenichi Takai
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Effects of chromium and molybdenum on hydrogen absorption behavior in iron have been investigated by determining the equilibrium concentration of hydrogen (CH) and calculating the heat of solution of hydrogen (ΔH) in pure Fe, Fe-2.37Cr, and Fe-4.23Mo. Specimens were chemically polished prior to cathodic hydrogen charging. They were charged with hydrogen in a solution of 0.1 N NaOH and 5 g l−1 NH4SCN at 30 °C with different charging times to determine CH. To calculate ΔH, they were charged with hydrogen at various temperatures (30, 40, and 50 °C). As results, CH in pure Fe was the highest, whereas that in Fe-4.23Mo was the lowest. It was also found that ΔH values of Fe-4.23Mo and Fe-2.37Cr were positive with that the former was being the highest. Moreover, the pure Fe specimen applied strain of 0.3 had a higher negative value of ΔH than pure Fe. These findings indicate that a solid solution of Mo in Fe reduces CH compared with that of Cr.


Hydrogen absorption Iron Lattice defect Substitutional atoms Chromium Molybdenum 


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© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Vanadia Irisca Yussalla
    • 1
    Email author
  • Tomohiko Omura
    • 2
  • Kenichi Takai
    • 3
  1. 1.Graduate School of Science and TechnologySophia UniversityTokyoJapan
  2. 2.Nippon Steel CorporationFuttsu City, ChibaJapan
  3. 3.Faculty of Science and Technology, Department of Engineering and Applied SciencesSophia UniversityTokyoJapan

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