Table 2. Fitting Parameters of EIS EECs Obtained for Untreated Al6061, Al-A, and Al-B Surfaces.

element	bare Al-6061	Al-A	Al-B
Relec (Ω/cm–2)	1.324	3.132	1.428
Rcoating (Ω/cm–2)		1911	1374
CPEcoating (mS/sn·cm2)		0.95	1.71
ncoating		0.91	0.92
Ccoating(mF)		1.01	1.84
Rsubstrate (Ω/cm–2)	4399	3690	1845
CPEsubstrate (μS/sn·cm2)	25.22	6.86	9.88
diffusion (ms)	0.4	158.5	3.5
ZWarburg (Ω/cm–2)	1.23	545.4	42.59
nWarburg	0.42	0.33	0.30