TY - JOUR
T1 - Long-term in vitro corrosion behavior of Zn-3Ag and Zn-3Ag-0.5Mg alloys considered for biodegradable implant applications
AU - Wątroba, Maria
AU - Mech, Krzysztof
AU - Bednarczyk, Wiktor
AU - Kawałko, Jakub
AU - Marciszko-Wiąckowska, Marianna
AU - Marzec, Mateusz
AU - Shepherd, Duncan E.T.
AU - Bała, Piotr
PY - 2022/1/1
Y1 - 2022/1/1
N2 - In this paper, Zn-3Ag and Zn-3Ag-0.5Mg alloys were studied in terms of applicability as biodegradable implant materials. The performed tensile, compression and bending tests indicate a high strengthening effect induced by the Ag and Mg additions, additionally resulting in grain size refinement. It was shown that sustaining plastic strain during deformation depends on the applied stress causing asymmetric mechanical behavior of the tested Zn-based materials. Electrochemical measurements and immersion tests in Hanks' solution lasting up to 180 days revealed that Ag and Mg contribute to the change of the Zn matrix's open circuit potential and the formation of micro-galvanic cells between the Zn grains and precipitates. The fine-grained microstructure and evenly distributed small precipitates led to uniform corrosion occurring via pit formation on the corroded surface due to intergranular and micro-galvanic corrosion mechanisms. The corrosion rate of the Zn-3Ag-0.5Mg alloy after 180 days was almost twice that of pure Zn and the Zn-3Ag alloy.
AB - In this paper, Zn-3Ag and Zn-3Ag-0.5Mg alloys were studied in terms of applicability as biodegradable implant materials. The performed tensile, compression and bending tests indicate a high strengthening effect induced by the Ag and Mg additions, additionally resulting in grain size refinement. It was shown that sustaining plastic strain during deformation depends on the applied stress causing asymmetric mechanical behavior of the tested Zn-based materials. Electrochemical measurements and immersion tests in Hanks' solution lasting up to 180 days revealed that Ag and Mg contribute to the change of the Zn matrix's open circuit potential and the formation of micro-galvanic cells between the Zn grains and precipitates. The fine-grained microstructure and evenly distributed small precipitates led to uniform corrosion occurring via pit formation on the corroded surface due to intergranular and micro-galvanic corrosion mechanisms. The corrosion rate of the Zn-3Ag-0.5Mg alloy after 180 days was almost twice that of pure Zn and the Zn-3Ag alloy.
KW - Biodegradation
KW - Electrochemical measurements
KW - Galvanic corrosion
KW - Mechanical properties
KW - Microstructure
KW - Zn alloys
UR - http://www.scopus.com/inward/record.url?scp=85120712694&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2021.110289
DO - 10.1016/j.matdes.2021.110289
M3 - Article
AN - SCOPUS:85120712694
SN - 0264-1275
VL - 213
JO - Materials and Design
JF - Materials and Design
M1 - 110289
ER -