Table 4 Linear polarization resistance parameters for API X60 steel in CO2 saturated 3.5% NaCl without and with 50 ppm TBA at pH 4 after different immersion times.

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

Time (h)

Blank

50 ppm

%IE

CR (mpy)

Rp (Ω cm2)

CR (mpy)

Rp (Ω cm2)

2

69.5

142.6

2.1

4655

96.9

12

75.6

131.1

1.8

5469

97.6

24

81.5

121.7

1.6

6248

98.1

48

93.7

105.8

1.5

6701

98.4

72

95.8

103.4

1.4

7202

98.6

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