Mojca Slemnik (Author), Ingrid Milošev (Author)

Abstract

The effect of complexing agents EDTA and citric acid on the electrochemical behaviour of AISI 304 and orthopaedic stainless steels in Ringer physiological solution was investigated by potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS). The content of Mo has a pronounced effect on the corrosion resistance, as evident by the broader passive range of the orthopaedic stainless steel containing Mo. The addition of complexing agents induces significant changes in polarization and impedance characteristics, i.e., the shift of corrosion and breakdown potentials in a more negative direction, an increase in current density, and a significant decrease in charge transfer resistance. The results were interpreted by the formation of soluble complexes of metal ions with chelating agents, especially EDTA, which suppressed the formation of the outer Fe(III) layer of the passive film. The impact of complexing agent on the electrochemical parameters was found to be related to its concentration in electrolyte and the stability constant of the complex formed with the related metal ion.

Keywords

obstojnost materiala;korozijska obstojnost;nerjavno jeklo;ortopedija;potenciodinamična polarizacija;elektrokemijska impedančna spektroskopija;resistance;corrosion resistance;stainless steel;orthopedy;potentiodynamic polarization emthod;electrochemical impedance spectroscopy;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 620.193:617.3
COBISS: 10666262 Link will open in a new window
ISSN: 0957-4530
Views: 1412
Downloads: 80
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Other data

Secondary language: English
Secondary keywords: obstojnost materiala;korozijska obstojnost;nerjavno jeklo;ortopedija;potenciodinamična polarizacija;elektrokemijska impedančna spektroskopija;
URN: URN:SI:UM:
Pages: str. 911-918
Volume: ǂVol. ǂ17
Issue: ǂno ǂ10
Chronology: Oct. 2006
ID: 8717114