Effect of Cu Addition on the Electrochemical Corrosion Performance of Ni₃Al in 1.0 M H₂SO₄

Table 1

Electrochemical parameters of the tested materials in a 1.0 M H₂SO₄ solution at 25°C.

Material	(mV)	(mV/Dec)	(mV/Dec)	(A/cm^2)	(mV)	(A/cm^2)	(mV)	(mA/cm^2)
Ni3Al	−279	40	124	9.1 ± 0.05	−105	15000 ± 0.05	—	—
Ni3Al-1Cu	−279	49	90	2.8 ± 0.05	104	17000 ± 0.05	—	—
Ni3Al-3Cu	−272	65	140	3.8 ± 0.05	190	55000 ± 0.05	—	—
Ni3Al-5Cu	−249	90	157	4.5 ± 0.05	73	15000 ± 0.05	164 ± 0.00005	18
Ni	−297	71	122	31.2 ± 0.05	−70	16000 ± 0.05	498 ± 0.00005	450 ± 0.00005
Cu	−121	81	437	2.5 ± 0.05	—	—	—	—
Al	−682	274	136	56.0 ± 0.05	—	—	—	—

and indicate the primary passivation potential and primary passivation current density.
and indicate the repassivation potential and current density, respectively.