Biological Behaviour and Enhanced Anticorrosive Performance of the Nitrided Superelastic Ti-23Nb-0.7Ta-2Zr-0.5N Alloy

Table 2

Main electrochemical parameters for Ti and bare and nitrided Ti-23Nb-0.7Ta-2Zr-0.5N alloy in Ringer’s solution of different pH values, at 37°C.

Material	(mV)	(mV)	(mV)	(mV)	(A/cm^2)
Ringer pH = 3.21
Ti	−400	−200	>1000	200	25.1
Bare Ti-23Nb-0.7Ta-2Zr-0.5N	−350	−150	>1000	200	6.3
Nitrided Ti-23Nb-0.7Ta-2Zr-0.5N	−250	−100	>1000	150	3.2
Ringer pH = 7.58
Ti	−320	−200	>1000	120	15.2
Bare Ti-23Nb-0.7Ta-2Zr-0.5N	−250	−150	>1000	100	2.3
Nitrided Ti-23Nb-0.7Ta-2Zr-0.5N	−150	−50	>1000	50	1.2
Ringer pH = 8.91
Ti	−475	−275	>1000	200	18.3
Bare Ti-23Nb-0.7Ta-2Zr-0.5N	−350	−250	>1000	100	5.5
Nitrided Ti-23Nb-0.7Ta-2Zr-0.5N	−250	−150	>1000	100	3.3