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In vitro corrosion resistance of orthodontic super stainless steel wire-The effect of stress relieving heat treatment

Authors
 Keun Taek Oh  ;  Chung Ju Hwang  ;  Yong Soo Park  ;  Kyoung Nam Kim 
Citation
 JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol.149(9) : 414-421, 2002 
Journal Title
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN
 0013-4651 
Issue Date
2002
Keywords
stainless steel ; biomedical materials ; dentistry ; corrosion resistance ; heat treatment ; quenching (thermal) ; cooling ; current density ; porous materials
Abstract
Generally, orthodontic stainless steel wires are made from 18-8 stainless steels, but because of their low resistance to localized corrosion, corrosion can still occur easily in the oral cavity. Therefore for the present study, rectangular wire was produced experimentally with super stainless steel (SR-50A), which then underwent stress relieving heat-treatment in air, argon, or vacuum, at 500°C, for 6 min, followed finally by either quenching or furnace cooling. The corrosion resistance and ion release properties of the wires were investigated. SR-50A exhibited a low current density of about 1 μA/cm2 and a stable passive region in artificial saliva. Meanwhile, the comparative wires displayed a high current density because of the pitting that occurred above the breakdown potential. SR-50A heat-treated in either vacuum or argon demonstrated high corrosion resistance and a low ion release rate irrespective of the cooling method, but the SR-50A heat-treated in air exhibited low corrosion resistance. The comparative wires, heat-treated in air or quenched, showed very low corrosion resistance and a high ion release rate due to their porous and nonprotective film. SR-50A was less sensitive to the heat-treatment conditions than the comparative wires, and further was able to inhibit the release of metallic ions in the oral cavity. Therefore, these properties of SR-50A are considered to satisfy all the requirements for the safe application of orthodontic wire. © 2002 The Electrochemical Society. All rights reserved.
Full Text
http://jes.ecsdl.org/content/149/9/B414.short
DOI
10.1149/1.1497983
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyoung Nam(김경남)
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/144083
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