Corrosion parameters determined from weight-loss tests in 0.5 M H₂SO₄ solution in the absence and presence of various concentrations of inhibitor at 298 K.

Inhibitor	C (mg L−1)	v corr (g m−2 h−1)	IEW (%)
Blank	—	37.99	—
PD-1	5	12.23	67.8
	10	10.75	71.7
	20	9.42	75.2
	50	8.28	78.2
	100	6.04	84.1
PD-2	5	7.10	81.3
	10	6.57	82.7
	20	6.42	83.1
	50	5.01	86.8
	100	3.42	91.0