CORROSION STUDIES OF STAINLESS-STEEL 316L, MODIFIED BY ION-BEAM TECHNIQUES, UNDER SIMULATED PHYSIOLOGICAL CONDITIONS

Authors
Citation
K. Meinert et Gk. Wolf, CORROSION STUDIES OF STAINLESS-STEEL 316L, MODIFIED BY ION-BEAM TECHNIQUES, UNDER SIMULATED PHYSIOLOGICAL CONDITIONS, Surface & coatings technology, 98(1-3), 1998, pp. 1148-1156
Citations number
15
Categorie Soggetti
Materials Science, Coatings & Films
ISSN journal
02578972
Volume
98
Issue
1-3
Year of publication
1998
Pages
1148 - 1156
Database
ISI
SICI code
0257-8972(1998)98:1-3<1148:CSOS3M>2.0.ZU;2-A
Abstract
Stainless steel 316L is a commonly used material for medical implants in orthopaedic surgery. In order to improve its performance in biologi cal surroundings, metallic coatings (Au, Ag, Cu and Zn) were deposited by evaporation (vapour deposition) followed by ion beam mixing. Ceram ic coatings (Al2O3) were produced by ion beam-assisted deposition. As protection against galvanic corrosion of the 316L bulk material in con tact with noble metals, an alumina layer was deposited on to the bulk material and afterwards the coatings with noble metals were carried ou t. Potentiostatic and potentiodynamic corrosion experiments in physiol ogical sodium chloride solution and in human plasma showed interesting differences in the corrosion behaviour between these two electrolytes . Coatings with a high corrosion protection in human plasma sometimes showed poor corrosion protection in physiological sodium chloride solu tion. These findings are discussed on the basis of the electrochemical properties of the systems. The combination of alumina and silver coat ings showed the best results in electrochemical corrosion evaluations in both solutions. (C) 1998 Elsevier Science S.A.