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Biocorrosion investigation of two shape memory nickel based alloys: Ni‐Mn‐Ga and thin film NiTi
Author(s) -
Stepan L.L.,
Levi D.S.,
Gans E.,
Mohanchandra K.P.,
Ujihara M.,
Carman G.P.
Publication year - 2007
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31192
Subject(s) - materials science , shape memory alloy , nickel titanium , corrosion , thin film , electropolishing , passivation , biocompatibility , metallurgy , nickel , electrochemistry , composite material , electrode , nanotechnology , chemistry , layer (electronics) , electrolyte
Thin film nitinol and single crystal Ni‐Mn‐Ga represent two new shape memory materials with potential to be used as percutaneously placed implant devices. However, the biocompatibility of these materials has not been adequately assessed. Immersion tests were conducted on both thin film nitinol and single crystal Ni‐Mn‐Ga in Hank's balanced salt solution at 37°C and pH 7.4. After 12 h, large pits were found on the Ni‐Mn‐Ga samples while thin film nitinol displayed no signs of corrosion. Further electrochemical tests on thin film nitinol samples revealed breakdown potentials superior to a mechanically polished nitinol disc. These results suggest that passivation or electropolishing of thin film nitinol maybe unnecessary to promote corrosion resistance. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2007