Solidification microstructure-dependent hydrogen generation behavior of Al–Sn and Al–Fe alloys in alkaline medium |
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Authors: | Camila Konno Clarissa Cruz Thiago Costa André Barros Pedro Goulart Amauri Garcia Noé Cheung |
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Affiliation: | 1. Department of Manufacturing and Materials Engineering, University of Campinas – UNICAMP, 13083-860, Campinas, SP, Brazil;2. Department of Production Engineering, Federal University of Ouro Preto - UFOP, 35931-008 João Monlevade, MG, Brazil;3. Federal Institute of Education, Science and Technology of Pará – IFPA, 66093-020, Belém, PA, Brazil;4. Federal Institute of Education, Science and Technology of São Paulo – IFSP, 18202-000, Itapetininga, SP, Brazil |
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Abstract: | This work deals with the development of quantitative correlations of hydrogen evolution performance with solidification microstructural and thermal parameters in Al–1Sn, Al–2Sn, Al–1Fe, and Al-1.5Fe wt.%] alloys. The cellular growth as a function of growth and cooling rates is evaluated using power type experimental laws, which allow determining representative intervals of microstructure length scale for comparison purposes with the results of immersion tests in 5 wt%NaOH solution. For both Al alloys systems, hydrogen evolution becomes slower as the alloy solute content increased. However, for a given alloy composition, whereas a more homogeneous distribution of Sn-rich particles promotes faster hydrogen generation using Al–Sn alloys, coarsening of Al6Fe IMCs (intermetallic compounds) fibers favors hydrogen production using Al–Fe alloys. When solidification conditions that result in a range of cellular spacings within 16 and 19 μm are considered, the specific hydrogen production of the Al-1wt.%Fe alloy is higher than that of the other studied alloys. |
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Keywords: | Hydrogen evolution Al alloys Solidification Microstructure |
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