Inhibition of Mild Steel Corrosion by 3-Benzoylmethyl Benzimidazolium Hexafluoroantimonate in Acidic Solution

Table 2

Effect of concentration of 3-Benzoylmethyl benzimidazolium hexafluoroantimonate (BMBI) on the corrosion rate (mg·cm⁻²·h⁻¹) and percentage efficiency of mild steel in 1.0 M HCl at various temperatures.

Concentration of Inhibitor	Temperature/K
	303		313		323		333		343
	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency	Corr. Rate	% Efficiency
1 M HCl	0.961	—	1.394	—	4.671	—	12.225	—	26.280	—
1 M HCl + 5×10^−7 M	0.363	62.3	0.686	50.8	2.673	42.8	8.539	30.2	21.874	16.8
1 M HCl + 5×10^−6 M	0.229	76.2	0.508	63.6	2.177	53.4	6.619	45.9	17.227	34.4
1 M HCl + 5×10^−5 M	0102	89.4	0.182	86.9	1.179	74.8	4.440	63.7	11.835	55.0
1 M HCl + 5×10^−4 M	0.018	98.1	0.052	96.0	0.256	94.5	2.321	81.0	7.503	71.5