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Microstructural analysis, heat treatment, and corrosion resistance of Mg-4Y-3(Nd,Gd)-0.5Zr and Mg-10Gd-1Eu-1Zn-0.2Zr alloys

Grant number: 24/17021-5
Support Opportunities:Scholarships abroad - Research Internship - Scientific Initiation
Start date: February 01, 2025
End date: April 30, 2025
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:José Eduardo Spinelli
Grantee:Lucca Donatão Gonçales Falci
Supervisor: Ricardo Pereira Nogueira
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Institution abroad: Université Grenoble Alpes (UGA), France  
Associated to the scholarship:24/05671-5 - Microstructure, aging and corrosion in Mg-4Y-3(Nd,Gd)-0.5Zr and Mg-10Gd-1Eu-1Zn-0.2Zr alloys, BP.IC

Abstract

Global Magnesium (Mg) production has risen, driven by growing worldwide demand, and is expected to grow in the coming years. Mg is essential in manufacturing light alloys for the automotive industry, which has driven research to improve its mechanical and corrosion properties. Adding rare earth elements to these alloys has been explored to enhance their corrosion resistance. However, there is a research gap in understanding the microstructural variations in Mg alloys containing rare earth elements and their effects on corrosion. This research project aims to address this gap through microstructural analysis and corrosion studies on rare earth-containing Mg alloys. Both Mg-4Y-3(Nd,Gd)-0.5Zr and Mg-10Gd-1Eu-1Zn-0.2Zr alloys (in wt.%) will be examined in as-cast and thermally treated conditions. The LEPMI-Grenoble laboratory is a global reference and one of the leading centers in the study of corrosion and protective film formation on metals. Therefore, its facilities will be utilized in this study. Four samples will be evaluated, identifying phases and quantifying their sizes and distribution. All samples will be subjected to simulated body fluid to understand the time-dependent processes and interfacial phenomena. Parameters such as potential elevation, polarization resistance escalation, and changes in Nyquist and Bode plots will be monitored over 7 days based the following methods: open circuit potential (OCP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS). Lastly, the corrosion resistance of these samples will be assessed, focusing on the characteristics of the protective layers formed and the released ions upon exposition time.

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