Authors: Rokicki, R.; Hryniewicz, T.

Source: Transactions of the Institute of Metal Finishing, Volume 86, Number 5, September 2008 , pp. 280-285(6)

Publisher: Maney Publishing

Abstract:

A new advanced technology is proposed to obtain bare metal surfaces for peripheral stents, endodontic files and another medical devices. The effect of an externally applied magnetic field during electropolishing (magnetoelectropolishing) of Nitinol on its surface properties was investigated. The results are compared with standard electropolished Nitinol in the same electrolyte under the same process conditions. To evaluate surface properties, the following techniques were used: SEM and EDX, AFM, contact angle measurement, Auger electron spectroscopy, electrochemical impedance spectroscopy and fatigue resistance testing. All of the above analyses showed significant differences between magnetoelectropolished and conventional electropolished Nitinol surfaces. The two most prominent differences, which are likely to have the most profound implications on increased use of this intermetallic material in medical application are improved wettability and fatigue resistance.

Keywords: MAGNETOELECTROPOLISHING; SURFACE PROPERTIES; WETTABILITY; STANDARD ELECTROPOLISHING; PASSIVE LAYER; NITINOL

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174591908X345040

Publication date: 2008-09-01

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