O,O'-(2-甲基-2,4-亚戊基)二硫代磷酸-N,N-二乙铵的合成、表征及缓蚀性能评价

doi:10.11944/j.issn.1000-0518.2016.02.150219

摘要/Abstract

摘要：

合成了O,O'-(2-甲基-2,4-亚戊基)二硫代磷酸-N,N-二乙铵(PDP),用元素分析、红外光谱、核磁共振谱和X射线单晶衍射等技术手段对其结构进行了表征。PDP属四方晶系,I-4空间群,其晶胞参数为:a=2.1357(3) nm,b=2.1357(3) nm,c=0.71892(11) nm,α=β=γ=90°,V=3.2791(8) nm³,Z=8,D_c=1.156 g/cm³,F(000)=1232,μ(MoKα)=0.412 mm^-1,F(000)=1232,S=0.952,R=0.0664,wR=0.1791[I>2σ(I)]。PDP通过N—H••••S和C—H••••S氢键作用形成了一维超分子孔道结构。PDP在HCl溶液中对Q235钢的缓蚀性研究表明:PDP能有效抑制Q235钢的腐蚀,是阴极为主的混合型缓蚀剂,在Q235钢表面的吸附符合Langmuir 吸附,属自发进行的物理化学吸附;在25 ℃的1.0 mol/L HCl溶液中PDP浓度为140 mg/L时的缓蚀率达到98.9%。CCDC:1404464。

关键词: O,O'-亚烷基二硫代磷酸铵, 晶体结构, 缓蚀性, 吸附机理

Abstract:

A new compound, N,N-diethylammonium O,O'-(2-methyl-2,4-pentylene)dithiophosphate(PDP), was synthesized and characterized by elemental analysis, IR, NMR, and X-ray single crystal diffraction analysis. The crystallographic structure analysis reveal that PDP crystallizes in tetragonal system, I-4 space group, a=2.1357(3) nm, b=2.1357(3) nm, c=0.71892(11) nm, α=β=γ=90°, V=3.2792(10) nm³, Z=8, D_c=1.156 g/cm³, F(000)=1232, μ(MoKα)=0.412 mm^-1, F(000)=1232, S=0.952, R=0.0664, wR=0.1791 [I>2σ(I)]. One-dimensional channel supramolecular network structure is formed by N—H••••S and C—H••••S interactions in the PDP crystal. PDP as a novel corrosion inhibitor for carbon steel in HCl solution was evaluated by mass loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results show that PDP acts as a mixed type inhibitor with cathodic inhibition as the dominative action. The adsorption of PDP on carbon steel surface obeys Langmuir isotherm, and the corrosion inhibition belongs to both physi- and chemisorptions. The inhibition efficiency is up to 98.9% with PDP concentration of 140 mg/L in 1.0 mol/L HCl solution at 25 ℃.

Key words: ammonium O,O'-alkylenedithiphosphate, crystal structure, inhibition efficiency, adsorption mechanism

中图分类号:

魏健, 谢斌, 赖川, 何林芯, 李玉龙, 邹立科, 樊义康. O,O'-(2-甲基-2,4-亚戊基)二硫代磷酸-N,N-二乙铵的合成、表征及缓蚀性能评价[J]. 应用化学, 2016, 33(2): 190-199.

WEI Jian, XIE Bin, LAI Chuan, HE Linxin, LI Yulong, ZOU Like, FAN Yikang. Synthesis, Characterization, and Corrosion Inhibition of N,N-Diethylammonium O,O'-(2-Methyl-2,4-pentylene)dithiophosphate[J]. Chinese Journal of Applied Chemistry, 2016, 33(2): 190-199.

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