Citation: 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. doi: 10.11944/j.issn.1000-0518.2016.02.150219 shu

Synthesis, Characterization, and Corrosion Inhibition of N,N-Diethylammonium O,O'-(2-Methyl-2,4-pentylene)dithiophosphate

WEI Jian ^a ,
XIE Bin ^a,, ,
LAI Chuan ^b ,
HE Linxin ^a ,
LI Yulong ^a ,
ZOU Like ^a ,
FAN Yikang ^a

1.
a Institute of Functional Materials, Material Corrosion and Protection Key Laboratory of Sichuan Province, University Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education, Sichuan University of Science & Engineering, Zigong, Sichuan 643000, China;
2.
b School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, Sichuan 635000, China

Corresponding author: XIE Bin,
Received Date: 29 June 2015
Available Online: 25 September 2015
Fund Project:

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℃.
- ammonium O,O'-alkylenedithiphosphate,
- crystal structure,
- inhibition efficiency,
- adsorption mechanism
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