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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