Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (8): 955-964.DOI: 10.11944/j.issn.1000-0518.2017.08.170039

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Corrosion Inhibition of Q235 Steel by Moxifloxacin in Hydrochloric Acid Solution

ZHENG Xingwenab*(),GONG Minb,CHEN Shilina   

  1. aSchool of Chemical and Pharmaceutical Engineering
    bKey Laboratory of Material Corrosion and Protection of Sichuan Province,Sichuan University of Science & Engineering,Zigong,Sichuan 643000,China
  • Received:2017-02-20 Accepted:2017-05-24 Published:2017-07-25 Online:2017-07-26
  • Contact: ZHENG Xingwen
  • Supported by:
    Supported by Talent Project of Sichuan University of Science & Engineering(No.2016RCL11) , the Open Funds of Material Corrosion and Protection Key Laboratory of Sichuan Province(No.2016CL03)

Abstract:

In order to develop new environment-friendly corrosion inhibitors, the corrosion inhibition of Q235 steel by moxifloxacin in 1 mol/L HCl solution and its mechanism were investigated using electrochemical measurements, mass loss method and quantum chemistry calculation. The results reveal that moxifloxacin is an effective mixed-type inhibitor with a predominantly cathodic action for the corrosion of Q235 steel in HCl solution. The inhibition efficiency increases with increased concentration of the inhibitor, but decreases with incremental temperature. The adsorption of moxifloxacin on steel surface is a spontaneous process, and obeys the Langmuir isotherm as well as the El-Awady thermodynamic-kinetic model. Accordingly, the thermodynamic and kinetic parameters were calculated and discussed. Moreover, quantum chemistry calculation was employed to give further insight into the inhibition mechanism of moxifloxacin, and the results showed that the corrosion inhibition of moxifloxacin was caused by physical adsorption and chemical adsorption.

Key words: moxifloxacin, Q235 steel, corrosion inhibitor, adsorption