쇼트피닝 가공 Ti-6Al-4V의 추가 표면 가공에 따른 부식 저항

Abstract

Ti-6Al-4V has been used as an implant material because of its high toughness, high strength, low density, and strong corrosion resistance. However, ions and proteins present in the human body accelerate the corrosion of implant materials. Shot peening is one of the simplest ways to induce compressive residual stress on the metal surface, which has a positive effect on the fatigue life and corrosion resistance of metals. The surface of implants inserted into the body, such as knee joints, needs to be smooth to reduce frictional wear. Therefore, in this study, the surfaces of coin-sized specimens were grinded after a shot peening process. Then, an accelerated corrosion test was performed by supplying a constant current (5 mA) to the specimen, in normal saline, for one hour. The results show that the shot peening process improves corrosion resistance, and the corrosion depth depends on the degree of surface treatment.