Table 6 Electrochemical kinetic variables from EIS studies for C-steel in 1.0 M HCl without and with different doses of the studied inhibitors at 298 K.

From: Experimental and computational approaches of methoxy naphthylbithiophene derivatives and their use as corrosion protection for carbon steel in acidic medium

Inhibitor

EIS data

Conc.,

M

Rct

Ω cm2

Yo,µΩ−1 sn cm−2

n

Cdl

μF cm2

Θ

%ηEIS

Goodness of fit

(χ2)

 

Blank

30.6 ± 0.1753

306

0.849

161.4 ± 0.2122

–

–

15.71 × 10–3

MA-1440

5 × 10–6

107.5 ± 0.1664

211

0.853

113.1 ± 0.1612

0.715

71.5

17.44 × 10–3

10 × 10–6

122.0 ± 0.2109

198

0.859

104.9 ± 0.1553

0.749

74.9

20.57 × 10–3

15 × 10–6

135.5 ± 0.1632

187

0.859

97.2 ± 0.1762

0.774

77.4

19.11 × 10–3

20 × 10–6

152.2 ± 0.1728

179

0.865

92.3 ± 0.1332

0.799

79.9

21.01 × 10–3

25 × 10–6

170.9 ± 0.1543

170

0.874

88.2 ± 0.1751

0.821

82.1

16.33 × 10–3

30 × 10–6

178.9 ± 0.2128

166

0.875

87.2 ± 0.2013

0.829

82.9

23.11 × 10–3

MA-1456

5 × 10–6

91.1 ± 0.1745

219

0.887

139.1 ± 0.1743

0.664

66.4

16.16 × 10–3

10 × 10–6

99.1 ± 0.1453

214

0.888

131.6 ± 0.1451

0.691

69.1

13.61 × 10–3

15 × 10–6

112.7 ± 0.1401

208

0.891

119.6 ± 0.1812

0.728

72.8

15.78 × 10–3

20 × 10–6

127.6 ± 0.2024

193

0.896

108.0 ± 0.2109

0.760

76.0

18.87 × 10–3

25 × 10–6

135.5 ± 0.1741

185

0.891

102.2 ± 0.2202

0.774

77.4

17.55 × 10–3

30 × 10–6

141.1 ± 0.1224

180

0.899

98.8 ± 0.1913

0.783

78.3

16.22 × 10–3

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