UAE Neem Extract as a Corrosion Inhibitor for Carbon Steel in HCl Solution

Table 3

The Effect of concentration of the aqueous extract of Neem leaves on the corrosion rate (mg⋅cm⁻²⋅h⁻¹) and percentage efficiency of carbon steel in 1.0 M HCl at various temperatures.

	Temperaure e/K
	343		333		323		313		303
Concentration of Inhibitor	% Efficieny	Corr. Rate	% Efficieny	Corr. Rate	% Efficieny	Corr. Rate	% Efficieny	Corr. Rate	Corr. Rate	% Efficieny
1.0 M HCl	0.961	—	1.394	—	4.671	—	12.225	—	26.280	—
1.0 M HCl + 0.02 g/L	0.548	43	0.920	34	3.643	22	11.247	8	32.324	−23
1.0 M HCl + 0.20 g/L	0.336	65	0.600	57	2.989	36	11.003	10	31.010	−18
1.0 M HCl + 0.50 g/L	0.250	74	0.544	61	2.382	49	9.169	25	27.594	−5
1.0 M HCl + 1.00 g/L	0.221	77	0.516	63	2.055	56	7.964	35	25.229	4
1.0 M HCl + 2.00 g/L	0.192	80	0.446	68	1.822	61	7.335	40	24.178	8