Author/Editor		Kocijan, Aleksandra; Milošev, Ingrid; Pihlar, Boris
Title		The influence of complexing agent and proteins on the corrosion of stainless steels and their metal components
Type		članek
Source		J Mater Sci Mater M
Vol. and No.		Letnik 14
Publication year		2003
Volume		str. 69-77
Language		eng
Abstract		The present work is devoted to the problem of biodegradation of orthopaedic implants manufactured from stainless steel. In vitro simulations ofthe biocompatibility oftwo types of stainless steel, AISI 304 and AISI 316L, and their individual metal components, i.e. iron, chromium, nickel and molybdenum, were carried out in simulated physiological solution (Hank's) containing complexing agents. Knowledge of the effects of the chemical and biological complexing agents, EDTA and proteins, respectively, on the corrosion resistance of a metal should provide a better understanding of the processes occurring in vivo on its surface. The behavior of stainless steels and metal components was studied under open circuit and under potentiostatic conditions. The concentration of dissolved corrosion products in the form of released ions was determined by differential pulse polarography (DPP) and atomic emission spectrometry using inductively coupled plasma (ICP-AES). The composition of solid corrosion products formed on the surface was analyzed by energy dispersive X-ray spectroscopy (EDS) and their morphology was viewed by scanning electron microscopy (SEM). The addition of EDTA and proteins to physiological solution increased the dissolution of pure metals and stainless steels. The effect of particular protein differs on different metals and alloys.
Descriptors		STAINLESS STEEL CORROSION IMPLANTS, ARTIFICIAL EDETIC ACID PROTEINS IRON CHROMIUM NICKEL MOLYBDENUM MICROSCOPY, ELECTRON, SCANNING POLAROGRAPHY SPECTRUM ANALYSIS