Table 8 Activation parameters for API X60 steel in 3.5% NaCl without and with 50 ppm 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)

Ea (kJ mol−1)

ΔHa (kJ mol−1)

ΔSa (J K−1 mol−1)

Blank

13.6

11.1

−171

50

7.4

5.3

−221

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