Table 2 EIS parameters of MS in 1M HCl in absence and presence of varying concentrations of LPr and LPr + 10 ppm NaBenz inhibitors at 30 °C.

From: L-proline mixed with sodium benzoate as sustainable inhibitor for mild steel corrosion in 1M HCl: An experimental and theoretical approach

C (ppm)

R s

(Ω cm2)

R ct

(Ω cm2)

χ2 × 10−2

CPE

Cdl × 10−3

(Fcm−2)

ηEIS (%)

Y0 × 10−3 (Ω−1sncm−2)

n

1M HCl

1.473

21.22

2.3

0.16

0.9935

0.155

—

LPr

  100

1.21

60.428

2.5

0.159

0.9961

0.156

64.9

  200

0.61

81.202

1.5

0.151

0.9956

0.148

73.8

  300

3.05

96.79

2.7

0.106

0.9953

0.104

78.1

  400

1.48

133.26

5.7

0.098

0.9958

0.962

84.1

  500

17.11

156.29

2.1

0.091

0.9961

0.891

86.4

  600

14.13

117.66

1.8

0.081

0.9963

0.080

81.9

LPr + 10 ppm NaBenz

  10 ppm NaBenz

1.18

21.9

2.1

0.155

0.9949

0.152

3.1

  100

0.61

81.20

2.2

0.153

0.9956

0.15

73.9

  200

3.05

96.79

3.1

0.106

0.9953

0.104

78.1

  300

1.48

133.26

1.6

0.108

0.9958

0.106

84.1

  400

17.10

156.29

2.9

0.118

0.9961

0.117

86.4

  500

2.59

169.51

2.7

0.116

0.9959

0.114

87.5

  600

0.60

138.64

3.4

0.120

0.9940

0.117

84.7

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