resumo
In this work metallic pins made of Mg5Gd alloy were coated with magnetron sputtered PVD Mg5Gd layers. Immersion tests in Hank's balanced salt solution (HBSS) were performed. The PVD coating drastically reduced the corrosion rate of the Mg5Gd pin. The corrosion mechanism of the coating was studied in model electrochemical measurements by Scanning Vibrating Electrode Technique and galvanic current measurements. The tests revealed the preferential anodic dissolution of the Mg5Gd coating galvanically coupled with the bulk Mg5Gd pin. Local measurements of Volta potential difference revealed the VPD contrast between the pin and the coating surfaces only after immersion in HBSS.
palavras-chave
SCANNING KELVIN PROBE; BIODEGRADABLE MAGNESIUM IMPLANTS; HIGH-PURITY MG; RARE-EARTH; CORROSION BEHAVIOR; IN-VIVO; PURE MAGNESIUM; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; HYDROGEN EVOLUTION
categoria
Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
autores
Yasakau, KA; Bastos, AC; Haffner, D; Quandt, E; Feyerabend, F; Ferreira, MGS; Zheludkevich, ML
nossos autores
António Alexandre Cunha Bastos
Investigador Auxiliar
Kiryl Yasakau
Investigador Auxiliar
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoProjectos
Projeto de Investigação Exploratória: Kyril Yasakao (IF/01284/2015)
agradecimentos
KY acknowledges the Portuguese Foundation for Science and Technology for the researcher grant (IF/01284/2015). A part of this work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. The authors would like to thank HZG and the DFG for financial support.