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Electrochemical characteristic of TiNi shape memory alloy in artificial body fluids
Author(s) -
Liang Chenghao,
Huang Naibao
Publication year - 2008
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.32062
Subject(s) - materials science , shape memory alloy , pitting corrosion , dissolution , sma* , corrosion , electrochemistry , alloy , precipitation , simulated body fluid , scanning electron microscope , electron microprobe , metallurgy , ion , chemical engineering , composite material , electrode , chemistry , physics , mathematics , combinatorics , meteorology , engineering , quantum mechanics
In this work, the electrochemical characteristic of TiNi shape memory alloy (SMA) in Hank's solution was studied. The results indicated that low potential active dissolution of TiNi SMA occurred at a potential range of 150–250 mV during anodic polarizing. Its corrosion resistance was not affected by temperature, but was deeply affected by pH and Cl − ion concentration. Decreasing pH and improving Cl − ion concentration made the pitting broken potential ( E b ) move toward negative and increased the sensitivity to pitting corrosion. Electro‐probe microanalyzer and scanning electron microscope analysis showed that low potential active dissolution resulted in forming Ti 2 Ni precipitation phase in the hole, which enriched Ti and deficient Ni, became the sensitive position to pitting corrosion. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009