Table 5 EFM parameters of MS in 1 M HCl in the absence and presence of different concentrations of 6a and 6b at 298 K.

From: Corrosion inhibition of mild steel in 1 M HCl by pyrazolone-sulfonamide hybrids: synthesis, characterization, and evaluation

Inhibitor

C

Icorr

βa

βc

K

CF (2)

CF (3)

θ

IE

EFM%

(ppm)

(uA)

(mV dec−1)

(mV dec−1)

(mpy)

Blank

–

1007

73.76

92.82

460.30

2.033

3.191

–

–

6a

50

83.9

207

212

38.360

1.575

1.865

0.917

91.668

100

76

45.41

48.00

34.730

1.474

2.332

0.925

92.457

200

61.2

30.20

30.83

27.988

1.016

2.91

0.939

93.923

500

51.9

16.68

17.39

23.743

1.49

3.08

0.948

94.845

6b

50

71.4

42.57

45.97

33.08

1.09

2.622

0.929

92.91

100

68.4

44.96

48.67

30.70

1.8

2.544

0.932

93.21

200

57.7

36.96

39.79

26.37

1.15

2.434

0.943

94.27

500

44.7

22.17

22.77

20.40

2.6

3.371

0.956

95.56

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