Study of the electrochemical dissolution behavior of Nitinol shape memory alloy in different electrolytes for micro-ECM process

Nickel-titanium alloy (Nitinol) is an excellent shape memory (SMA) for microelectro-mechanical systems (MEMS) particularly in biomedical applications owing to its three features effect (SME), superelasticity, and biocompatibility. The temperature-dependent material transformation properties of Nitinol SMAs make conventional machining difficult. Micro-ECM, a non-conventional process conductive materials regardless their strength hardness, has the potential fabricate microfeatures on Nitinol. This study presents investigation electrochemical dissolution behavior different electrolytes micro-ECM. influence nature was studied by fabricating microchannels levels parameters containing applied voltage electrolyte concentration. first were all aqueous neutral electrolytes, i.e., NaCl, NaNO3, NaBr. NaNO3 successful at parameters. However, form relatively huge amount sludge machined surface reducing both efficiency accuracy. Thus, ethylene glycol-based used with lower depth overcut (DOC), width (WOC), length (LOC) respect electrolyte. potentiodynamic polarization (PDP) tests through cyclic voltammetry (CV) shows passive active non-aqueous