Table 3 Tafel polarization parameters for API X60 steel in CO2 saturated 3.5% NaCl in the absence and presence of different concentrations of TBA at pH 4.

From: Eco-friendly 2-Thiobarbituric acid as a corrosion inhibitor for API 5L X60 steel in simulated sweet oilfield environment: Electrochemical and surface analysis studies

Concentration (ppm)

Ecorr (mV/SCE)

icorr (µA/cm2)

βa (mV/decade)

-βc (mV/decade)

%IE

Blank

−707

231

55.5

30.6

−

25

−680

7.42

37.7

46.4

96.8

50

−680

6.23

32.2

38.4

97.3

75

−672

2.69

26.5

26.6

98.9

100

−696

9.62

23.8

23.7

95.8

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