TABLE 2.

Electrochemical polarization parameters for API 5L X52 steel in 0.5 M H₂SO₄ as a function of Tradescantia spathacea concentration at 25°C.

Inhibitor [ppm]	-Ecorr mV	icorr µAcm−2	βa mVdec−1	-βc mVdec−1	IEP%
0	446 ± 0.001	1,017 ± 0.004	13	15
100	458 ± 0.002	791 ± 0.006	17	13	22
200	455 ± 0.003	398 ± 0.005	44	50	61
300	472 ± 0.002	97 ± 0.002	51	89	90
400	490 ± 0.004	24 ± 0.003	134	200	98