Arsenic contamination of coarse-grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid.
XPS measurements of coarse-grained and nanostructured nitinol (Ni(50.2)Ti(49.8)) before and after chemical treatment in hydrofluoric acid (40% HF, 1 min) are presented. The nanostructured state, providing the excellent mechanical properties of nitinol, is achieved by severe plastic deformation. The near-surface layers of nitinol were studied by XPS depth profiling. According to the obtained results, a chemical treatment in hydrofluoric acid reduces the thickness of the protective TiO(2) oxide layer and induces a nickel release from the nitinol surface and an arsenic contamination, and can therefore not be recommended as conditioning to increase the roughness of NiTi-implants. A detailed evaluation of the resulting toxicological risks is given.
Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia.
D M
DM
Korotin
S
S
Bartkowski
E Z
EZ
Kurmaev
C
C
Borchers
M
M
Müller
M
M
Neumann
D V
DV
Gunderov
R Z
RZ
Valiev
S O
SO
Cholakh
D000497:Alloys / Q000737:chemistry*; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D006858:Hydrofluoric Acid / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; C009495:titanium dioxide; C013616:nitinol; D014025:Titanium; D001151:Arsenic; D006858:Hydrofluoric Acid