Effect of Ta Additions on the Microstructure, Damping, and Shape Memory Behaviour of Prealloyed Cu-Al-Ni Shape Memory Alloys

Table 3

Electrochemical parameters of ternary Cu-Al-Ni and quaternary Cu-Al-Ni-Ta SMAs in 3 wt.% NaCl solution obtained from the polarization test.

Alloy	Corrosion potential, (mV versus SCE)	Current density, (μA/cm^2)	Cathodic slope, (mV/decade) versus SCE	Anodic slope, (mV/decade) versus SCE	Polarization resistance, (kΩcm^2)	Corrosion rate, (mm/year)
Cu−Al−Ni	−261.6	117.6	−211	78	4.57	2.68
Cu−Al−Ni−1.0 Ta	−220.5	78.4	−184	76	7.18	1.79
Cu−Al−Ni−2.0 Ta	−185.1	32.7	−148	72	18.64	0.74
Cu−Al−Ni−3.0 Ta	−159.3	12.8	−220	69	34.14	0.29