Table 3 Electrochemical impedance parameters and the corresponding protection efficiency (ɳR%) for the bare and different CGAC coated steel samples in 3.5 wt.% NaCl solution at 25 °C.

From: Green and sustainable chitosan–gum Arabic nanocomposites as efficient anticorrosive coatings for mild steel in saline media

CGAC dose in the coating

Rs

(Ω cm2)

Cdl

(µF cm-2)

n

Rp

(Ω cm2)

ɳR (%)

Bare steel

1.32 ± 0.5

153 ± 0.6

0.89

18.2 ± 0.3

–

25 ppm

1.24 ± 0.1

82 ± 0.4

0.86

89.7 ± 0.7

79.71

50 ppm

1.28 ± 0.3

79 ± 0.3

0.88

130.5 ± 0.2

86.05

100 ppm

1.06 ± 0.1

52 ± 0.5

0.85

190.7 ± 0.4

90.46

200 ppm

1.25 ± 0.2

16 ± 0.1

0.87

420.3 ± 0.2

95.67

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