Comparative Corrosion Inhibition Effect of Imidazole Compounds and of Trichodesma indicum (Linn) R. Br. on C38 Steel in 1 M HCl Medium

Table 2

Inhibition studies of plant extract.

Extract concentration (mg/L)	30°C			40°C			50°C			60°C
	C.R × 101 mmpy	IE (%)	Surface coverage (θ)	C.R × 101 mmpy	IE (%)	Surface coverage (θ)	C.R × 101 mmpy	IE (%)	Surface coverage (θ)	C.R × 101 mmpy	IE (%)	Surface coverage (θ)
0	0.2196	—	—	0.3599	—	—	0.5113	—	—	0.6516	—	—
25	0.035	72.5	0.9315	0.234	60.8	0.3498	0.144	70.5	0.343	0.1712	52.2	0.7373
50	0.033	80.3	0.9355	0.212	76.4	0.4109	0.1402	76.2	0.3615	0.1532	68	0.7648
75	0.026	97.5	0.9491	0.142	79.2	0.6054	0.038	88.6	0.8269	0.082	74	0.8742
100	0.031	86.2	0.9393	0.1608	86.4	0.5532	0.0889	84	0.5952	0.1164	70.5	0.8214