Original scientific paper

XPS measurements of AISI 316LVM SS biomaterial tubes after magnetoelectropolishing

Krzysztof Rokosz ; Division of Surface Electrochemistry and Technology, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Tadeusz Hryniewicz ; Division of Surface Electrochemistry and Technology, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Ryszard Rokicki ; ELECTROBRIGHT, 142 W. Main St., Macungie, PA 18062, USA

Abstract

XPS (X-ray Photoelectron Spectroscopy) measurements were performed on AISI 316LVM stainless steel tubes of biomaterial samples, serving for stents, after a standard electropolishing (EP), and magnetoelectropolishing (MEP). After electropolishing operations, the samples were kept in a closed foil pack for about four years. The results of XPS analysis indicate a significant difference in the measurement and calculation values, dependent on surface treatment method: EP and/or MEP. The steel surface film composition and PREN (pitting resistance equivalent number) were calculated. The highest numbers of these values were obtained on samples after MEP where both chromium compounds (Cr 2p) and molybdenum (Mo 3d) increased over three times against these values after EP treatment. The calculated PRENMEP (Fe, Cr, Mo, Mn, Ni, P, S, O) = 16,37, with PRENMEP (Fe, Cr, Mo, Mn, Ni, P, S) = 36,89, versus PRENEP (Fe, Cr, Mo, Mn, Ni, P, S, O) = 3,12, with PRENEP (Fe, Cr, Mo, Mn, Ni, P, S) = 8,53. The results obtained point to an advantageous and unusual effect of the magnetic field action during MEP.

Keywords

magnetoelectropolishing (MEP); PREN (pitting resistance equivalent number); 316LVM SS tube biomaterial; XPS results comparison

Hrčak ID:

126075

URI

https://hrcak.srce.hr/126075

Publication date:

15.8.2014.

Article data in other languages: croatian

Visits: 2.369 *