The electrochemical impedance of polarized 316L stainless steel: Structure-property-adsorption correlation

Robert T.T. Gettens, Jeremy L. Gilbert

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Electrochemical (EC) impedance and polarization data were synergistically coupled with AFM micrographs providing insight on the polarized alloy-electrolyte interface. Several regions of oxide topography/impedance characteristic were apparent on a 316L SS surface. A relatively rough surface with apparent EC reaction products was observed below -500 mV. Smooth surfaces were seen from -500 mV to 200 mV. A transition region which displayed the aggregation of particles on the surface was seen from 200 mV to 600 mV. Above 600 mV these particles disappeared revealing a smooth topography. These topographical observations matched closely with the impedance behavior of the system, particularly the capacitance (C), polarization resistance (R P) and current density. The presence of pre-adsorbed Fb had a significant impact on C below approximately -500 mV (increased capacitance). The deviation from ideality of the current response as determined by a KWW empirical dielectric decay function showed significant differences between PBS-immersed and pre-adsorbed Fb cases. Earlier, changes in Fb area coverage, height, and eccentricity were observed between voltages lower and higher than 0 mV. The presence of the flat-band potential around -150 mV as well as high cathodic charge-transfer reactions taking place below -100 mV relate to these observations.

Original languageEnglish (US)
Pages (from-to)121-132
Number of pages12
JournalJournal of Biomedical Materials Research - Part A
Volume90
Issue number1
DOIs
StatePublished - Jul 1 2009

Keywords

  • 316L SS
  • ECAFM
  • Fibrinogen
  • Impedance
  • Metal oxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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