기화성방청제 Dialkylamine (di-)nitrobenzoates 합성 및 방청성능

전용진; 박용성; 소순영

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.1, 6-11, February, 1999

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기화성방청제 Dialkylamine (di-)nitrobenzoates 합성 및 방청성능

Synthesis and Performance of Dialkylamine (di-)nitrobenzoates for Vapor Corrosion Inhibitor

전용진, 박용성, 소순영

초록

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 Na₂SO₄ 용액에 1%(w/v)용해시켜 potentiostatic method로 분극실험하여 조사하였다. 철에 대해 dialkylamine 3, 5-dinitrobenzoates보다 dialkylamine 4-nitrobenzoates 부동태화 전류밀도 (i_p)가 작았으며, diethylamine 4-nitrobenzoate 용액에서 낮은 값 (i_p; 4.78 mA/cm²)을 나타내었다. 비철에 대한 i_p값은 dialkylamine 3, 5-dinitrobenzoates가 작았고 dipropylamine 3, 5-dinitrobenzoate와 hexamethyleneimine 3, 5-dinitrobenzoate가 낮은 값 (i_p; 36, 37 mA/cm²)을 나타냈다. 방청제에 (NH₄)₂CO₃와 NaHCO₃ 첨가효과는 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 (i_p)는 0.26, 0.85 mA/cm²의 최소값을 각각 나타내었다.

Dialkylamine (di-)nitrobenzoates as vapor corrosion inhibitor were synthesized with dialkylamines and (di-)nitrobenzoic acids. The compounds were analyzed by elemental analyzer, FT-IR and ¹H-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 Na₂SO₄ aqueous solution] respectively. For corrosion inhibition of ferrous metal, dialkylamine 4-nitrobenzoates were better inhibitor than dialkylamine 3, 5-dinitrobenzoates, the passivating current density (i_p) 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)₂CO₃ and NaHCO₃ for corrosion inhibition of ferrous metal was excellent but that of non-ferrous metal was not. Optimum ratios of diethylamine 4-nitrobenzoate with (NH₄)₂CO₃ and NaHCO₃ were 4:6 and 5:5 (V/V), and passivating current densities (i_p) of the mixtures were shown 0.26 and 0.85 mA/cm², respectively.

Keywords:Corrosion Inhibitor;Dialkylamine (di-)nitrobenzoate;Passivation Current Density (i_p)

[References]

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[1] 김면섭, 한국부식학회지, 9, 37 (1980)

[2] Rozenfeld IL, Persiantseva BP, Terentiev PB, Corrosion, 20, 222t (1964)

[3] 김면섭, 한국부식학회지, 12, 31 (1983)

[4] Man CA, Trans. Electrochem. Soc., 72, 333 (1937)

[5] Hackerman N, Sudbury JD, J. Electrochem. Soc., 97, 109 (1950)

[6] Hackerman N, Sudbury JD, Ind. Eng. Chem., 46, 523 (1954)

[7] Hackerman N, Sudbury JD, Corrosion, 18, 332t (1962)

[8] Trabanelli G, Carassiti V, "Advances in Corrosion Science and Technology," 1, Plenum Press, 147 (1970)

[9] Scully JC, "The Fundamentals of Corrosion," 3rd Ed., Pergamon Press, Oxford (1990)

[10] Rozenfeld IL, "Corrosion Inhibitors," McGraw-Hill Inc., New York, 297 (1981)

[11] U.S. Patent, 3,791,855 (1974)

[12] Japan Patent, 86-15988 (1986)

[13] Japan Patent, 87-109987 (1987)

[14] Arnold E, Evans UR, "An Introduce to Metallic Corrosion," 3rd Ed. (1981)

[15] Wolef JK, Temple KL, J. Am. Chem. Soc., 70, 1411 (1948)

[16] Rozenfeld IL, "Corrosion Inhibitors," McGraw-Hill Inc., New York, 6 (1981)

[17] Miksic BA, Miller RH, Ann. Univ. Ferrara. Sez. 5 Suppl., 217 (1980)

[18] Hackerman N, Snavely ES, Panye JS, J. Electrochem. Soc., 113, 677 (1966)

[19] 김면섭, 한국부식학회지, 14, 47 (1985)