생체용 Ti-Nb-Zr-Ta합금의 전기화학적 특성

Abstract

The use of titanium and its alloy as biomaterial is increasing due to their low modulus, superior biocompatibility and enhanced corrosion resistance when compared to conventional stainless steel and cobalt-based alloys. The purpose of this study is to investigate the microstructure variation, phase transformation behavior and corrosion characteristics of Ti-13Nb-13Zr-xTa alloys. Two kinds of alloys containing Ta concentrations of 3 and 7 wt% were used to investigate the microstructure, corrosion resistance and others. The specimens were solution treatment in the β phase field of Ti alloy and followed by water quenching(WQ). The samples for optical metallography, scanning electron microscopy were prepared using standard techniques and etched with Kroll's reagent. X-ray diffraction(XRD) analysis for specimens were performed using a philips 3121 diffractomenter. Effect of alloy composition on the corrosion resistance was studied by anodic polarization test. From the results of anodic polarization behavior in Ti-13Nb-13Zr-xTa alloys, it was found that the corrosion resistance was increased with increasing Ta content.