Biocorrosion study of titanium-cobalt alloys.
The present work provides experimental results of corrosion behaviour in Hank's physiological solution and some other properties of in-house fabricated titanium-cobalt alloys with cobalt ranging from 25-30% in weight. X-ray diffraction (XRD) shows that, in water-quenched (WQ) alloys, beta-titanium is largely retained, whereas in furnace-cooled (FC) alloys, little beta-titanium is found. Hardness of the alloys increases with increasing cobalt content, ranging from 455 VHN for WQ Ti-25 wt% Co to 525 VHN for WQ Ti-30 wt% Co. Differential thermal analysis (DTA) indicates that melting temperatures of the alloys are lower than that of pure titanium by about 600 degrees C. Potentiodynamic polarization results show that all measured break-down potentials in Hank's solution at 37 degrees C are higher than 800 mV. The breakdown potential for the FC Ti-25 Wt% Co alloy is even as high as nearly 1200 mV.
Chern Lin
J H
JH
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan.
Lo
S J
SJ
Ju
C P
CP
D001672:Biocompatible Materials / Q000032:analysis / Q000737:chemistry; D003035:Cobalt / Q000032:analysis / Q000737:chemistry*; D003343:Corrosion; D003722:Dental Alloys / Q000032:analysis / Q000737:chemistry*; D004563:Electrochemistry; D006244:Hardness; D006358:Hot Temperature; D007552:Isotonic Solutions / Q000737:chemistry; D011199:Potentiometry; D013499:Surface Properties; D013816:Thermodynamics; D014025:Titanium / Q000032:analysis / Q000737:chemistry*; D014867:Water; D014961:X-Ray Diffraction
D001672:Biocompatible Materials; D003722:Dental Alloys; C072670:Hanks Balanced Salt Solution; D007552:Isotonic Solutions; C023988:beta titanium; D014867:Water; D003035:Cobalt; D014025:Titanium