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Table 4 Parameters of electrochemical impedance results for cast iron in 3.5 wt% NaCl in the absence and presence of different concentrations of polyurethane at ambient temperature

From: Fortification performance of polyurethane coating in outdoor historical ironworks

Conc. (M)

Rs (Ω)

CPE (µF cm−2)

α1

Rct (KΩ cm2)

CPEad (µF cm−2)

α2

Rads (Ω cm2)

RT (Ω cm2)

CPET (µF cm−2)

I.E. (%)

Blank

2.87

360.0

0.92

0.21

219.2

0.92

0.35

0.71

590.9

1%

3.24

280.0

0.88

2.3

154.1

0.89

2.89

4.95

420.0

87.9

2%

4.28

260.0

0.84

2.9

110.7

0.82

4.56

7.86

380.0

93.8