Sacrificial protection of Mg-based resorbable implant alloy by magnetron sputtered Mg5Gd alloy coating: A short-term study

authors	Yasakau, KA; Bastos, AC; Haffner, D; Quandt, E; Feyerabend, F; Ferreira, MGS; Zheludkevich, ML
nationality	International
journal	CORROSION SCIENCE
author keywords	Magnesium alloy; Biodegradable material; Magnetron sputtering; SVET; AFM; SKPFM
keywords	SCANNING KELVIN PROBE; BIODEGRADABLE MAGNESIUM IMPLANTS; HIGH-PURITY MG; RARE-EARTH; CORROSION BEHAVIOR; IN-VIVO; PURE MAGNESIUM; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; HYDROGEN EVOLUTION
abstract	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.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0010-938X
isbn	1879-0496
year published	2021
volume	189
digital object identifier (doi)	10.1016/j.corsci.2021.109590
web of science category	15
subject category	Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000677547100004