Hydrogen storage properties of filings of the ZK60 alloy modified with 2.5 wt% mischmetal

Author(s)

Silva, E. P. ^[1] ; Leiva, D. R. ^[2] ; Floriano, R. ^[3] ; Oliveira, V. B. ^[4] ; Pinto, H. C. ^[5] ; Botta, W. J. ^[2]

Affiliation

^[1] Fed Univ Vales Jequitinhonha & Mucuri UFVJM, Inst Engn Sci & Technol IECT, Januba, MG - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Dept Mat Engn, Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Sch Appl Sci, Limeira, SP - Brazil

^[4] Univ Estado Rio De Janeiro, Polytech Inst, Dept Mat, Nova Friburgo, RJ - Brazil

^[5] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mat Engn, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 45, n. 8, p. 5375-5383, FEB 14 2020.
• Web of Science Citations: 0

Abstract

In this study, a commercial Mg-based ZK60 alloy was modified with 2.5 wt% mischmetal (ZK60-2.5 wt%Mm) and further processed by cold rolling followed by manual filing. The chips obtained by manual filing process were collected from the as cast (AC) and the cold rolled (CR) materials. The hydrogen storage properties were evaluated by kinetics measurements at 350 degrees C. A full microstructural characterization including optical, scanning and transmission electron microscopy (MO, MEV and TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) was performed in the samples. For the first absorption of both filed samples the H storage capacity showed a value around 6.0 wt% after 1 h while for the CR sample it was close to 1.25 wt% after the same time. The manual filing produced samples with higher hydrogenation kinetics compared with that of the CR sample. Besides, their hydrogen storage capacity was maintained close to the theoretical value (6.75 wt%). The breakage and pulverization of the intermetallic phases gave the chips from the CR alloy the faster hydrogenation kinetics, especially for H-desorption. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 11/09324-8 - Friction stir welding of thixocast high performance magnesium alloys
• Grantee: Erenilton Pereira da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 16/13885-9 - Hydrogen storage properties of the heavily deformed ZK60 + 2.5wt.% Mm alloy after filing
• Grantee: Erenilton Pereira da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
• Grantee: Claudio Shyinti Kiminami
• Support Opportunities: Research Projects - Thematic Grants