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Table 5 EIS parameters obtained by fitting the data to an equivalent circuit for the samples immersed for 7 days in NaCl brine

From: Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

Sample Name

Rf

(Ω cm2) × 102

Qf

Cf

(F cm−2) × 10−4

Rct

(KΩ cm2)

Qdl

Cdl

(F cm− 2) × 10− 4

W

(Ω cm2 s-1/2)

Rpa

(KΩ cm2)

IE%b

Y0f

(Ω−1 cm− 2 snf) × 10− 4

nf

Y0dl

(Ω− 1 cm− 2 sndl) × 10− 4

ndl

WAPE0

1.48 ± 1.17

18.69 ± 8.00

0.64 ± 0.10

4.76 ± 3.27

1.09 ± 0.04

7.61 ± 3.51

0.83 ± 0.11

7.48 ± 3.73

–

1.24

–

WAPE1

1.42 ± 0.68

2.99 ± 1.25

0.62 ± 0.23

0.63 ± 0.32

7.67 ± 1.08

12.08 ± 3.84

0.66 ± 0.10

95.59 ± 77.55

–

7.82

84.2

WAPE2

5.78 ± 2.72

2.10 ± 0.76

0.83 ± 0.01

1.02 ± 1.33

10.56 ± 7.46

5.99 ± 1.43

0.61 ± 0.04

23.63 ± 19.87

75.75 ± 75.74

11.13

88.9

WAPE3

3.39 ± 3.35

3.26 ± 1.71

0.47 ± 0.19

0.44 ± 0.44

99.28 ± 98.31

3.28 ± 1.89

0.82 ± 0.03

3.04 ± 1.27

1.02 ± 1.01

99.61

98.8

  1. Note: standard errors are reported
  2. aRp = Rf + Rct
  3. bIE% = (1 - Rp (uninhibited) / Rp (inhibited)) × 100