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

作者：Korotin D M; Bartkowski S; Kurmaev E Z; Borchers C^*; Mueller M; Neumann M; Gunderov D V; Valiev R Z; Cholakh S O

来源：Journal of Biomedical Materials Research Part B: Applied Biomaterials , 2012, 100B(7): 1812-1816.

DOI：10.1002/jbm.b.32748

• nitinol
• XPS
• arsenic contamination
• TiO2

XPS measurements of coarse-grained and nanostructured nitinol (Ni50.2Ti49.8) 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 TiO2 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.

• 出版日期2012-10