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Metals 2016, 6(4), 73; doi:10.3390/met6040073

Effects of Cr2N Precipitation on the Antibacterial Properties of AISI 430 Stainless Steel

1
School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
2
Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
3
Ph.D. program, School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
4
Department of Mechanical Engineering, National PinTung University of Science and Technology, PingTung 91201, Taiwan
5
Graduate Institute of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
6
Department of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Harrie Weinans and Amir A. Zadpoor
Received: 12 February 2016 / Revised: 8 March 2016 / Accepted: 17 March 2016 / Published: 24 March 2016
(This article belongs to the Special Issue Metallic Biomaterials)
View Full-Text   |   Download PDF [4176 KB, uploaded 24 March 2016]   |  

Abstract

Based on their mechanical properties and good corrosion resistance, some commercial Ni-Cr stainless steels have been widely applied as biomaterials, including the austenitic 304 stainless steel, the austenitic 316 stainless steel, the duplex 2205 stainless steel, and the ferritic 430 stainless steel. In order to reduce the occurrence of infections resulting from biomaterial implants, instruments, and medical devices, Cu2+ and Ag2+ ions have been added onto biomaterials for increasing the antibacterial properties, but they are known to damage biofilm. The occurrence of nanoparticles can also improve the antibacterial properties of biomaterials through various methods. In this study, we used Escherichia coli and analyzed the microstructures of American Iron and Steel Institute (AISI) 430 stainless steel with a 0.18 mass % N alloy element. During a lower temperature aging, the microstructure of the as-quenched specimen is essentially a ferrite and martensite duplex matrix with some Cr2N precipitates formed. Additionally, the antibacterial properties of the alloy for E. coli ranged from 3% to 60%, consistent with the presence of Cr2N precipitates. When aged at a lower temperature, which resulted in nano-Cr2N precipitation, the specimen possessed the highest antibacterial activity. View Full-Text
Keywords: Cr2N precipitation; antibacterial behavior; ferritic type stainless steel; Escherichia coli Cr2N precipitation; antibacterial behavior; ferritic type stainless steel; Escherichia coli
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MDPI and ACS Style

Du, J.-K.; Chao, C.-Y.; Jhong, Y.-T.; Wu, C.-H.; Wu, J.-H. Effects of Cr2N Precipitation on the Antibacterial Properties of AISI 430 Stainless Steel. Metals 2016, 6, 73.

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