期刊
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
卷 30, 期 1, 页码 167-174出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2009.09.014
关键词
Magnesium alloy; Corrosion properties; Y2O3; Electrochemical impedance spectra; Biomedical materials
The bio-corrosion properties of Mg-Zn-Mn alloys with and without Y in Hank's solution at 37 degrees C were investigated by using electrochemical test and electrochemical impedance spectra (EIS). The results of open circuit potential (OCP) and polarization tests indicated that Y could reduce the cathodic current density. A passivative stage appeared in the Tafel curve of the Y containing magnesium alloy, indicating that a passivative film was formed on the surface of the Y containing magnesium alloy. EIS results showed that the Y containing alloy had higher charge transfer resistance and film resistance, but lower double layer capacity than the alloy without the Y element. The surface reaction product identification by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) showed that the surface corrosion products were hydroxide and phosphate (Mg3Ca3(PO4)(4)) for Mg-Zn-Mn alloy and phosphate (MgNaPO4) for the Y containing Mg-Zn-Mn alloys. The XPS results also showed that a Y2O3 protective film was formed on the surface of the Y containing magnesium alloy which contributed mainly to the low cathodic current density and the high resistance. (C) 2009 Elsevier B.V. All rights reserved.
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