Electrochemical behavior of Ti-Ni-Cu shape memory alloy ribbons used for the fabrication of sensors and actuators

Abstract:

Ti-Ni-Cu shape memory alloys have attracted much attention in recent years as intelligent and functional materials because of their unique mechanical, chemical and physical properties. This paper explores the corrosion behavior of equiatomic Ni-Ti, and ternary Ni-Ti-Cu with different Cu content in ribbons produced by meltspinning. It provides new insights towards understanding the electrochemical corrosion behavior of shape memory alloys (SMA) as one of the most advanced materials nowadays. The electrochemical corrosion behavior has been investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetery techniques in 0.9% NaCl solution and compared with Fe-Mn as a one of the most common shape memory alloys. The results proved an increased corrosion resistance of the high copper content Ni-Ti-Cu that could favor the use of such materials in corrosive environments for the fabrication of sensors and actuators. Fe-Mn ribbons showed a severe localized corrosion after short time of exposure to chloride containing media.

Año de publicación:

2013

Keywords:

• Shape memory alloys
• Rapid solidification
• Ti-Ni-Cu
• CORROSIÓN

Fuente:

scopus