Dialkylamine (di-)nitrobenzoates as vapor corrosion inhibitor were synthesized with dialkylamines and (di-)nitrobenzoic acids. The compounds were analyzed by elemental analyzer, FT-IR and1H-NMR spectrophotometer. Corrosion inhibition of synthetic compounds and additives [(NH4)2CO3, NaHCO3] against ferrous and non-ferrous metal was investigated by potentiostatic method [1% (w/v) corrosion inhibitor in 1M Na2SO4aqueous solution] respectively. For corrosion inhibition of ferrous metal, dialkylamine 4-nitrobenzoates were better inhibitor than dialkylamine 3, 5-dinitrobenzoates, the passivating current density (ip) of dialkylamine 4-nitrobenzoate was shown 4.78 mA/cm2. While, for non-ferrous metal, dialkylamine 3, 5-dinitrobenzoates were better, those of dipropylamine 3, 5-dinitrobenzoate and hexamethyleneimine 3, 5-dinitrobenzoate were shown 36 and 37 mA/cm2. Additive effect of (NH4)2CO3and NaHCO3for corrosion inhibition of ferrous metal was excellent but that of non-ferrous metal was not. Optimum ratios of diethylamine 4-nitrobenzoate with (NH4)2CO3and NaHCO3were 4:6 and 5:5 (V/V), and passivating current densities (ip) of the mixtures were shown 0.26 and 0.85 mA/cm2, respectively.

방청제로 dialkylaminc (di-)nitrobenzoates 14개 화합물을 합성하고 첨가제 효과와 함께 방청성능을 조사하였다. 합성화합물은 원소분석, FT-IR,1H-NMR 분석으로 확인하였으며, 합성한 화합물과 첨가제 [(NH4)2CO3, NaHCO3]의 방청능은 방청제를 1M Na2SO4용액에 1%(w/v)용해시켜 potentiostatic method로 분극실험하여 조사하였다. 철에 대해 dialkylamine 3, 5-dinitrobenzoates보다 dialkylamine 4-nitrobenzoates 부동태화 전류밀도 (ip)가 작았으며, diethylamine 4-nitrobenzoate 용액에서 낮은 값 (ip; 4.78 mA/cm2)을 나타내었다. 비철에 대한 ip값은 dialkylamine 3, 5-dinitrobenzoates가 작았고 dipropylamine 3, 5-dinitrobenzoate와 hexamethyleneimine 3, 5-dinitrobenzoate가 낮은 값 (ip; 36, 37 mA/cm2)을 나타냈다. 방청제에 (NH4)2CO3와 NaHCO3첨가효과는 철에 대해 높은 부식억제 효과를 나타냈으나, 비철에서는 좋은 결과를 얻지 못하였다. 철용 방청제 diethylamine 4-nitrobenzoate와 (NH4)2CO3, NaHCO3의 최적 혼합비율은 4:6과 5:5이며, 부동태화 전류밀도 (ip)는 0.26, 0.85 mA/cm2의 최소값을 각각 나타내었다.