TABLE 3.

EIS data obtained from API 5L X52 steel in 0.5 M H₂SO₄ at 25°C, without and with a corrosion inhibitor.

Inhibitor [ppm]	RS Ω cm−2	Rct Ω cm−2	Cdl µ F cm−2	n	%IE
0	3	46	61.3	0.91
100	8	111	38.7	0.87	58
200	8	180	37.4	0.84	74
300	6	388	20.4	0.84	88
400	6	433	13.2	0.83	89