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

摘要

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 Mossbauer Spectroscopy. The results obtained through polarization curves indicate that critical potential in pitting (E-cp) are shifted to a higher values with the increase in PETA concentration; PETA reduces anodic dissolution and also decrease of the corrosion current (i(corr)). Decrease of the corrosion current (i(corr)) was associated with a shift of corrosion potential (E-corr) to a less negative values. The polarization resistance(R-p) 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 Mossbauer spectrometry proves the uniformity, compactness and stability of the passive films.