Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (2): 190-199.DOI: 10.11944/j.issn.1000-0518.2016.02.150219

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

WEI Jiana,XIE Bina*(),LAI Chuanb,HE Linxina,LI Yulonga,ZOU Likea,FAN Yikanga   

  1. aInstitute 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
    bSchool of Chemistry and Chemical Engineering,Sichuan University of Arts and Science,Dazhou,Sichuan 635000,China
  • Received:2015-06-29 Accepted:2015-09-25 Published:2016-02-01 Online:2016-02-01
  • Contact: XIE Bin
  • Supported by:
    Supported by the Open Funds of Material Corrosion and Protection Key Laboratory of Sichuan Province(No.2012CL12, No.2014CL14, No.2015CL09), Scientific Research Funds of Education Department of Sichuan Province(No.13CZ0019, No.13ZB0130), Scientific and Technological Project of Zigong City Technology Beteau(No.2012H04), and Open Funds of University Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education(No.LYJ1306, No.LZJ14201, No.LYJ1503)

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, Dc=1.156 g/cm3, F(000)=1232, μ(Mo)=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

CLC Number: