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Citation: ZHANG Xin, GAO Bao-Jiao, SHEN Yan-Ling. Corrosion Inhibition of Quaternary Polyethyleneimine For Low Carbon Steel[J]. Chinese Journal of Applied Chemistry, ;2008, 25(2): 212-217. shu

Corrosion Inhibition of Quaternary Polyethyleneimine For Low Carbon Steel

1.
Department of Chemical Engineering, North University of China, Taiyuan 030051

Corresponding author: GAO Bao-Jiao,
Received Date: 7 January 2007
Available Online: 9 April 2007
Fund Project: 山西省自然基金(20040402)资助项目 (20040402)

Quaternary Polyethyleneimine(QPEI) was prepared via two steps of polymer reaction,tertiary amination and quaterisation,and the corrosion inhibition property and mechanism of QPEI for low carbon steel dipped in aqueous solution of H₂SO₄ of 0.5 mol/L were investigated by mass-loss method,electrochemical polarization measurement,and scanning electron microscopy.The experiment results showed that QPEI possessed excellent corrosion inhibition property,and at a concentration of 5 mg/L,the corrosion inhibition rate was up to 91% for A₃ steel sample which had been dipped in sulfuric acid medium of 0.5 mol/L for 72 h.QPEI can simultaneously hinder cathode process and anode process,so its corrosion inhibition belongs to the mixed type.With the synergistic action of physics and chemistry adsorptions,QPEI can produce compact and dense film on the steel surface.The adsorption of QPEI on the surface of low carbon steel obeyed Langmuir equation.
- polyethyleneimine,
- quaternary ammonium salt,
- corrosion inhibition,
- corrosion inhibition mechanism
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