Impedance Studies of Thermochemically Activated 316L Stainless Steel

  • Wen Ching Say Department of Materials & Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
  • Chen Chang Chan Department of Materials & Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
  • Jin Shyong Lin Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
  • Chien Chon Chen Department of Energy and Resources, National United University, Miaoli 30063, Taiwan
  • Alex Fang Department of Energy and Resources, National United University, Miaoli 30063, Taiwan
  • Shih Hsun Chen Department of Energy and Resources, National United University, Miaoli 30063, Taiwan

Abstract

This study proposed a novel thermochemical activation (TCA) method to modify the surface of 316L stainless steel (SS). At the first stage, phosphate ions were introduced to 316L SS surface by a heat-diffusion process. After rapid quenching into calcium citrate solution, calcium and hydroxide ions were sealed in the TCA compound layer. The TCA and original 316L SS were immersed in Hanks’ solution to evaluate their biocompatibility. Electrochemical impedance spectroscopy analysis showed that the surface active compound layer affected the TCA 316L SS, and its total impedances of Bode and Nyquist plots were higher than that of the original ones during immersed in Hank’s from 1 to 14 days. After TCA treatment, the corrosion resistance increased greatly, and thus reducing the release of ions from stainless steel, such as Fe, Cr, Ni and Mo. In the Ca- and P-rich areas, the ions were guided to deposit in the Hanks’ solution, forming bone-like hydroxyl apatite. The treatment has been proven to reduce the ionic release from 316L SS, which is considered to be a great improvement for implanted alloys.

Published
2017-06-14
How to Cite
SAY, Wen Ching et al. Impedance Studies of Thermochemically Activated 316L Stainless Steel. Atlas Journal of Materials Science, [S.l.], v. 2, n. 2, p. 73-77, june 2017. ISSN 2330-6831. Available at: <http://journals.atlas-publishing.org/index.php/AJMS/article/view/127>. Date accessed: 18 nov. 2017. doi: https://doi.org/10.5147/ajms.v2i2.127.
Section
ARTICLES