Four organic volatile corrosion inhibitors (VCIs) were synthesized using 2-cinnamyl imidazoline with various acids such as salicylic acid, maleic acid, nitrobenzoic acid and phthalic acid and evaluated as corrosion inhibitors of mild steel, brass and copper by weight loss method. Eschke test method, sodium chloride inoculation test method and sulfur dioxide (SO2) test method were also carried out to investigate the corrosion inhibiting effect of the compounds. All the investigated VCIs exhibited good inhibition efficiency (IE) for all the metals. Phthalate salt showed best result among all studied compounds for all the metals.
Keywords: Eschke test, ferrous and non-ferrous metals, imidazoline salts, salt inoculation test, sulfur dioxide test, volatile corrosion inhibitor