Effect of copper on the localized corrosion resistance of Ni-Ti shape memory alloy

被引:58
|
作者
Rondelli, G [1 ]
Vicentini, B [1 ]
机构
[1] CNR, TEMPE, I-20125 Milan, Italy
关键词
Ni-Ti-Cu alloy; localized corrosion tests; passive films; martensitic transformation;
D O I
10.1016/S0142-9612(01)00142-9
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
An electrochemical study aiming at the evaluation of corrosion parameters using potentiodynamic and potentiostatic techniques ("scratch" and modified ASTM F746) was conducted in 0.9% NaCl on wires from equiatomic Ni-Ti and ternary Ni44Ti51Cu5 superelastic alloys with Ti90Mo10 as a reference material. The results obtained using potentiostatic tests. that Simulate better the behavior of material in service conditions than potentiodynamic ones, indicate that both Ni-Ti and Ni-Ti-Cu wires exhibit low corrosion potentials (approximate to 50-150 mV versus SCE) inferior to that of Ti-Mo alloy. The latter proved to be immune to localized corrosion attacks up to 800 mV. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:639 / 644
页数:6
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