Table 4 Corrosion parameters obtained from weight loss measurements of carbon steel after 24 h immersions in 1 M HCl with and without addition of different concentrations of inhibitor compounds.

From: Synthesis and applications of novel Schiff base derivatives as corrosion inhibitors and additives for improvement of reinforced concrete

T (K)

Inhibitor conc. (M)

DHSiMF

DHSiB

ΔW (mg)

CR, (mg cm-2 h–1)

θ

ηw (%)

ΔW (mg)

CR, (mg cm–2 h–1)

θ

ηw(%)

303

Blank

93

0.4020

–

–

93

0.4020

–

–

5 × 10–6

18

0.0778

0.806

80.65

22

0.0951

0.763

76.34

1 × 10–4

16

0.0692

0.828

82.80

20

0.0865

0.785

78.48

1 × 10–3

13

0.0562

0.860

86.02

18

0.0778

0.806

80.65

5 × 10–3

12

0.0519

0.871

87.10

16

0.0692

0.828

82.79

1 × 10–2

11

0.0475

0.882

88.17

14

0.0605

0.850

84.95

313

Blank

121

0.5230

–

–

121

0.5230

–

–

5 × 10–6

34

0.1470

0.719

71.90

38

0.1643

0.686

68.59

1 × 10–4

32

0.1383

0.736

73.55

35

0.1513

0.711

71.07

1 × 10–3

28

0.1210

0.769

76.86

30

0.1297

0.752

75.20

5 × 10–3

27

0.1167

0.777

77.69

28

0.1210

0.769

76.86

1× 10–2

26

0.1124

0.785

78.51

25

0.1081

0.793

79.33

323

Blank

154

0.6657

–

–

154

0.6657

–

–

5 × 10–6

57

0.2464

0.630

62.99

65

0.2810

0.578

57.79

1 × 10–4

55

0.2377

0.643

64.29

60

0.2594

0.610

61.03

1 × 10–3

51

0.2205

0.669

66.88

56

0.2421

0.636

63.63

5 × 10–3

49

0.2118

0.682

68.18

52

0.2248

0.662

66.23

1 × 10–2

48

0.2075

0.688

68.83

50

0.2161

0.675

67.54

333

Blank

162

0.7003

–

–

162

0.7003

–

–

5 × 10–6

75

0.3242

0.537

53.70

80

0.3458

0.506

50.62

1 × 10–4

73

0.3155

0.549

54.94

78

0.3372

0.518

51.85

1 × 10–3

69

0.2983

0.574

57.41

74

0.3199

0.543

54.32

5 × 10–3

68

0.2939

0.580

58.02

70

0.3026

0.568

56.79

1 × 10–2

67

0.2896

0.586

58.64

68

0.2939

0.580

58.03

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