US EPA

1255514 

Journal Article 

Arsenic contamination of coarse-grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid 

Korotin, DM; Bartkowski, S; Kurmaev, EZ; Borchers, C; Müller, M; Neumann, M; Gunderov, DV; Valiev, RZ; Cholakh, SO 

2012 

Yes 

Journal of Biomedical Materials Research. Part B: Applied Biomaterials
ISSN: 1552-4973
EISSN: 1552-4981 

100B 

7 

1812-1816 

English 

22807469 

10.1002/jbm.b.32748 

WOS:000308403200011 

http://doi.wiley.com/10.1002/jbm.b.32748
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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. 

nitinol; XPS; arsenic contamination; TiO2