Table 2 Computer fit results (± error) of the impedance spectra obtained for the steel electrode that was cathodically polarized in CaCl2 brine solution containing different concentrations of copolymer 2 after 3 h.

From: Assessment of self-doped poly (5-nitro-2-orthanilic acid) as a scaling inhibitor to control the precipitation of CaCO3 and CaSO4 in solution

Conc. (ppm)

Rs (Ohm cm2)

Q (µF)

n

Rct (Ohm cm2)

% Inhibition

0

5.03 ± 0.04

209.3 ± 1.15

0.79

2017 ± 23.5

–

25

17.0 ± 0.14

60.13 ± 0.77

0.78

1577 ± 18.4

21.8

50

6.8 ± 0.06

182 ± 2.8

0.68

1276 ± 14.2

36.7

100

1.17 ± 0.039

358.2 ± 2.3

0.79

761.9 ± 11.3

62.3

150

29.7 ± 0.028

361 ± 2.2

0.87

460.3 ± 4.2

77.2

200

8.0 ± 0.048

307 ± 1.9

0.75

1285 ± 14.9

36.3

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