Electroformation of Coatings Modified with Silver on Magnesium Alloys for Biomedical Applications

LOPERENA A.P; FORERO LÓPEZ, A.D.; BRUGNONI, L.I.; LEHR, I.L.; SAIDMAN, S.B.

PORTUGALIAE ELECTROCHIMICA ACTA

Editorial Board

Lugar: Coimbra; Año: 2020 vol. 38 p. 351 - 364

0872-1904

Three different films modified with silver species were considered to enhance thecorrosion resistance of AZ91D Mg alloy and to impart its surface with antibacterialactivity. First, coatings were electrodeposited under potentiostatic conditions inelectrolyte solutions containing Na2MoO4 and/or Ce(NO3)3 as main compounds, andH2O2, ascorbic acid or citric acid as additives. Incorporation of silver species was doneby immersion of the samples in AgNO3 solutions. The obtained modified films werecharacterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).The corrosion protection properties of the films were examined in a simulatedphysiological solution by open circuit measurements, linear polarization andelectrochemical impedance spectroscopy (EIS). The antibacterial effect of the coatingswas evaluated using Escherichia coli bacteria. Cerium and molybdenum-based coatingmodified with silver provides superior antibacterial and anticorrosive propertiescompared to the other films studied.