Performance of Methyl-5-Benzoyl-2-Benzimidazole Carbamate (Mebendazole) as Corrosion Inhibitor for Mild Steel in Dilute Sulphuric Acid

Table 1

Weight loss (g) of mebendazole in dilute H₂SO₄ at various inhibitor concentrations and exposure times.

Exposure time (hrs)	Corrosion properties	Inhibitor concentrations (g/l)
		Blank	0.5	1.0	1.5
24	WL (g)	2.96	0.15	0.10	0.13
	CR (mm/yr)	2.19	0.11	0.07	0.01
	η (%)	—	94.98	96.62	95.61
	Φ	—	0.95	0.97	0.96
48	WL (g)	5.64	0.22	0.27	0.30
	CR (mm/yr)	2.09	0.08	0.10	0.11
	η (%)	—	94.68	96.28	96.10
	Φ	—	0.95	0.96	0.96
72	WL (g)	3.37	0.35	0.19	0.20
	CR (mm/yr)	0.83	0.09	0.05	0.05
	η (%)	—	89.61	94.36	94.07
	Φ	—	0.90	0.94	0.94
96	WL (g)	6.07	0.54	0.36	0.36
	CR (mm/yr)	1.12	0.10	0.07	0.07
	η (%)	—	91.10	94.07	94.07
	Φ	—	0.91	0.94	0.94
120	WL (g)	9.31	0.46	0.68	0.78
	CR (mm/yr)	1.38	0.07	0.10	0.12
	η (%)	—	91.62	95.70	95.06
	Φ	—	0.92	0.96	0.95