Table 2.

EIS parameters for neat coatings, plain coatings, and layered coatings in 3.5 wt% NaCl at room temperature.

Coating	Exposure Time, Days	Rs kΩ cm2	Rpo kΩ cm2	Ypo × 10−6 Ω−1 sncm−2	R1 kΩ cm2	Y1 × 10−6 Ω−1 sncm−2	R2 kΩ cm2	Y2 × 10−9 Ω−1 sncm−2	W × 10−6 Ω−1 sncm−2
Pure	1st	0.916	33.17	0.814	110.3	0.094	----	----	----
	2nd	0.876	39.68	0.693	98.42	0.168	----	----	----
	3rd	0.796	46.39	0.652	81.37	0.237	----	----	----
	4th	0.824	36.11	0.765	73.14	0.429	----	----	----
Plain	1st	0.111	143.9	0.083	210.7	0.058	----	----	0.677
	2nd	0.241	204.7	0.059	290.0	0.046	----	----	1.34
	3rd	0.048	231.9	0.051	401.2	0.028	----	----	3.54
	4th	0.118	191.1	0.072	550.1	0.020	----	----	7.01
Smart	1st	0.179	128.19	0.965	216.92	0.093	----	----	1.68
	2nd	0.116	635.2	0.011	992.3	0.006	3916.1	6.134	0.97
	3rd	0.156	582.4	0.016	2041.4	0.001	5651.2	2.871	3.01
	4th	0.164	1213.0	0.004	1648.5	0.001	34,000	7.396	2.13