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The characterization of surfaces of electro polished 316L stainless steel for orthopedic implant applications

A SAMIDE1,* , I. BIBICU2, B. OPREA3, N. CIOATERA1, A. CIUCIU1

Affiliation

  1. University of Craiova, Faculty of Chemistry, Calea Bucuresti 107i, Craiova, Romania
  2. National Institute of Materials Physics, 077125-Magurele-Bucharest, Romania
  3. University of Medicine and Pharmacy Craiova, Faculty of Medicine, Petru Rares 2,Romania

Abstract

The characterization of the surface of electro polished 316L stainless steel by using poly(O-2-hydroxyethyl) starch (PETA) in physiological serum (PS) is discussed according to electrochemical measurements, scanning electron microscopy and Mössbauer Spectroscopy. The results obtained through polarization curves indicate that critical potential in pitting (Ecp) are shifted to a higher values with the increase in PETA concentration; PETA reduces anodic dissolution and also decrease of the corrosion current (icorr). Decrease of the corrosion current (icorr) was associated with a shift of corrosion potential (Ecorr) to a less negative values. The polarization resistance(Rp) increases for the surfaces which were electro polished in physiological serum in the presence of PETA. Scanning electron microscopy(SEM) shown no evidence of corrosion pits on Surfaces of Electro polished 316L Stainless Steel, but the formation of a thick film on the steel surface was observed. The surface Mössbauer spectrometry proves the uniformity, compactness and stability of the passive films..

Keywords

316 stainless steel, Electro polished, SEM, Mössbauer Spectroscopy.

Submitted at: April 25, 2008
Accepted at: June 9, 2008

Citation

A SAMIDE, I. BIBICU, B. OPREA, N. CIOATERA, A. CIUCIU, The characterization of surfaces of electro polished 316L stainless steel for orthopedic implant applications, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 6, pp. 1431-1436 (2008)