Resumen

FLORES-SANCHEZ, Daniel et al. Effect of the Tempering Heat Treatment on the Cu-Based Shape Memory Alloy Exposed to a Commonly used Corrosive Medium. J. Mex. Chem. Soc [online]. 2023, vol.67, n.4, pp.422-431.  Epub 26-Abr-2024. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v67i4.2042.

In the present work, the corrosion behavior of the as-cast Cu-9Al-3Ag alloy, with shape memory, SMA, and with tempering heat treatments at two temperatures, 400 and 600 °C, were studied. These treatments were selected due to the austenite-martensite phase transition or vice versa. For this investigation, a 0.5 M NaCl electrolyte was used. Micrographs using optical microscopy and scanning electron microscopy show the martensite phase in the Cu-9Al-3Ag alloy, likewise, in the tempered samples the austenite-martensite phases were also observed. For the evaluation of the corrosion behavior, the Tafel model was implemented, for whose curves a potential of ±200 mV was used from the Ecorr. It was observed that the sample with SMA presented a good resistance to corrosion, as well as the tempered samples, unlike the as-cast sample. Finally, impedance tests were carried out using a frequency range of 100 kHz to 10 mHz and an amplitude of 10 mV, in order to observe the resistances to the solution and to the charge transfer present in each one of the samples used.

Palabras llave : Corrosion; heat treatment; Tafel curves; EIS; shape memory alloy.

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