[ Article ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 2, pp.120-124

ISSN: 2508-5107 (Online)

Print publication date 15 Apr 2018

Received 05 Dec 2017 Revised 18 Jan 2018 Accepted 31 Jan 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.2.120

쇼트피닝 가공 Ti-6Al-4V의 추가 표면 가공에 따른 부식 저항

오성훈^a ; 정성균^b ; 신기훈^b^{, *}

Corrosion Resistance of Shot Peened Ti-6Al-4V by Additional Surface Treatment

Sunghun Oh^a ; Seong-Kyun Cheong^b ; Ki-Hoon Shin^b^{, *}

aDepartment of Mechanical Engineering, Graduate School of Seoul National University of Science and Technology, 232, Gongneung-ro, Nowon-gu, Seoul 01811, Korea
bDepartment of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, 232, Gongneung-ro, Nowon-gu, Seoul 01811, Korea

Correspondence to: ^*Tel.: +82-2-970-6320, Fax: +82-2-949-1458, E-mail address: shinkh@seoultech.ac.kr (Ki-Hoon Shin).

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.

Keywords:

Titanium Alloy, Shot peening, Corrosion, Surface treatment

Acknowledgments

본 연구는 서울과학기술대학교 교내연구비 지원으로 수행되었습니다.

References

William, H. L., Sanjeev, S., Benjamin, S., Richard, I., 2008, Athletic Activity After Total Joint Arthroplasty, The Journal of Bone and Joint Surgery, 90:10 2245-2252.
Elias, N. C., Lima, C. J. H., Valiev, R., Meyers, A. M., 2008, Biomedical Applications of Titanium and Its Alloys, The Journal of the Minerals, Metals & Materials Society, 60:3 46-49.
Fekry, M. A., 2009, The Influence of Chloride and Sulphate Ions on the Corrosion Behavior of Ti and Ti-6Al-4V Alloy in Oxalic Acid, Electrochimica Acta A, 54:12 3480-3489.
Khan, A. M., Williams, L. R., Williams, F. D., 1999, The Corrosion Behaviour of Ti-6Al-4V, Ti-6Al-7Nb and Ti-13Nb-Zr in Protein Solutions, Biomaterials, 20:7 631-637.
Clark, F. G. C., Williams, F. D., 1982, The Effects of Proteins on Metallic Corrosion, Journal of the Boimedical Materials Research Part A, 16:2 125-134.
Azar, V., Hashemi, B., Mahboobeh, R. Y., 2010, The Effect of Shot Peening on Fatigue and Corrosion Behavior of 316L Stainless Steel in Ringer's Solution, Surface and Coatings Technology, 204:21 3546-3551.
Peltz, S. J. D., Beltrami, R. L. V., Kunst, R. S., Brandolt, C., Malfatti, F. C. D., 2015, Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel, Materials Research, 18: 3 538-545.
Lee, S. C., Cheong, S. K., 2014, The Effect of Micro Peening Media Shape on the Life Time of Dental Implant, Master’s Thesis, Seoul National University of Science and Technology, Republic of Korea.
Kim, H. S., Lee, Y. S., Cheong, S. K., 2015, Effect of Shot Peening on the Corrosive Resistance of Ti-alloy Under Simulated Body Environment, Korean Journal of Dental Materials, 42:4 385-390.