09466 Corrosion and Immune Response of Advanced Titanium Alloys In Biological Environments

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Product Number: 51300-09466-SG

ISBN: 09466 2009 CP

Author: V .Ravi; G. Rey; D. Miracle; K. Morin; S. Castaneda; S. Tamirisa; W. Wantah; B. Permana and S. Alas

Publication Date: 2009

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Titanium alloys containing boron additions have shown remarkable improvements in processing and mechanical behavior. Significant reductions in grain size are observed even with trace additions of boron (< 0.1 wt% B) leading to benefits in processing. When the boron levels are increased to modest levels (~ 1 wt% B), the stiffness and strength of the Ti-6 Al-4 V base alloy increase by 20 – 30% with no loss in ductility. Keeping these advantages in mind, the aqueous corrosion behavior of these unique materials was investigated in this study to establish a baseline for performance and to provide insights into alloy design for environmental resistance. Cyclic polarization studies were conducted using biologically relevant solutions, i.e., 1 wt% NaCl, Ringer’s and Hank’s solutions. Differences in pitting potentials and pit morphology were observed with changes in boron content. A parallel study was also conducted in determining the biocompatibility of these alloys for human prosthetic use. This was performed by examining the effect of boron alloy on bone eroding osteoclasts. These are the cells responsible for prosthetic loosening and implant failure. Our study shows that addition of boron does not increase the activity of osteoclast bone erosion and, thus, not alter the biocompatibility of titanium alloys.

Keywords: titanium boron, sodium chloride, Ringer’s solution, Hank’s solution, osteoclasts, bone erosion, pitting corrosion