Hydrogen storage in magnesium chips produced by cryogenic machining

• Grant number: 17/23702-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2018
• End date: December 31, 2018
• Field of knowledge: Engineering - Mechanical Engineering - Manufacturing Processes
• Principal Investigator: Armando Ítalo Sette Antonialli
• Grantee: Filipe Ferrari Galan Déo
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

Magnesium and its alloys have been shown out to be excellent solutions on solid state hydrogen storage due to their extensive weight capacity, low cost, great availability and formation of reversible and recyclable hydrides. Their high thermodynamic stability, on the other side, urges the need for improvement related to hydrogen absorption and desorption kinetics on these materials. Good results for hydrogen cycling on magnesium chips produced by different machining processes have already been reported in the literature. In this work, the use of a cryogenic cutting fluid in commercially pure and a magnesium alloy shaping is proposed as an strategy for the enhancement of hydrogen absorption and desorption kinetics on the chips. It is supposed that high deformation level plus rapid cooling may allow the alloy aging, therefore precipitates cloud optimize cyclig timing. Cryogenic machining presents a very good opportunity associated to a very low environmental impact but high initial cost, which may be validated by tool life extending, cutting forces reduction, improvement of surface finishing and, in this case, chips seizing upon sustainability. (AU)