Effects of Chromium and Molybdenum on Hydrogen Absorption Behavior in Iron
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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.
KeywordsHydrogen absorption Iron Lattice defect Substitutional atoms Chromium Molybdenum
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