SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (8): 1408-1415.DOI: 10.1016/j.cjche.2015.05.002

• MATERIALS AND PRODUCT ENGINEERING • Previous Articles     Next Articles

Capsella bursa-pastoris extract as an eco-friendly inhibitor on the corrosion of Q235 carbon steels in 1 mol·L-1 hydrochloric acid

Qin Hu1, Yubing Qiu1,2, Guoan Zhang1,2, Xingpeng Guo1,2   

  1. 1 School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology,Wuhan 430074, China;
    2 Hubei Key Laboratory of Materials Chemistry and Service Failure, Wuhan 430074, China
  • Received:2014-01-20 Revised:2014-06-13 Online:2015-09-26 Published:2015-08-28
  • Contact: Xingpeng Guo
  • Supported by:

    Supported by the National Natural Science Foundation of China (51101066).

Capsella bursa-pastoris extract as an eco-friendly inhibitor on the corrosion of Q235 carbon steels in 1 mol·L-1 hydrochloric acid

Qin Hu1, Yubing Qiu1,2, Guoan Zhang1,2, Xingpeng Guo1,2   

  1. 1 School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology,Wuhan 430074, China;
    2 Hubei Key Laboratory of Materials Chemistry and Service Failure, Wuhan 430074, China
  • 通讯作者: Xingpeng Guo
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51101066).

Abstract: The corrosion inhibition effect of Capsella bursa-pastoris extracts (CBE) for Q235 carbon steels in 1 mol·L-1 hydrochloric acid solutionwas studied using electrochemical methods, environmental scanning electronmicroscopy (SEM) and Ramanmicroscopy analysis. The polarization plots indicate that CBE serves as an effective,mixedtype inhibitor. Linear polarization resistance shows that increasing CBE concentration and temperature results in increased inhibition efficiency. The highest inhibition efficiency can reach 97% when adding 60 mg·L-1 CBE, which is better than some reported plant extracts under the similar environment. The adsorption of CBE molecules is found to obey the Langmuir adsorption isotherm. Some thermodynamic and kinetic parameters for the adsorption process, such as the adsorption equilibriumconstant (K), free energy of adsorption (ΔGads), activation energy of corrosion reaction (Ea) and the heat of adsorption (Qads), are calculated and discussed. SEM and Raman microscopy analysis also demonstrate the formation of a CBE inhibition film on the metal surface.

Key words: Biomaterial, Corrosion inhibitor, Electrochemical technique, SEM, Raman spectroscopy

摘要: The corrosion inhibition effect of Capsella bursa-pastoris extracts (CBE) for Q235 carbon steels in 1 mol·L-1 hydrochloric acid solutionwas studied using electrochemical methods, environmental scanning electronmicroscopy (SEM) and Ramanmicroscopy analysis. The polarization plots indicate that CBE serves as an effective,mixedtype inhibitor. Linear polarization resistance shows that increasing CBE concentration and temperature results in increased inhibition efficiency. The highest inhibition efficiency can reach 97% when adding 60 mg·L-1 CBE, which is better than some reported plant extracts under the similar environment. The adsorption of CBE molecules is found to obey the Langmuir adsorption isotherm. Some thermodynamic and kinetic parameters for the adsorption process, such as the adsorption equilibriumconstant (K), free energy of adsorption (ΔGads), activation energy of corrosion reaction (Ea) and the heat of adsorption (Qads), are calculated and discussed. SEM and Raman microscopy analysis also demonstrate the formation of a CBE inhibition film on the metal surface.

关键词: Biomaterial, Corrosion inhibitor, Electrochemical technique, SEM, Raman spectroscopy