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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (3): 303-308    DOI: 10.11902/1005.4537.2017.098
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Corrosion Inhibition of Bio-based Inhibitor Furfuryl Glycidyl Ether
Wanjun PENG1,2, Jiheng DING1, Hao CHEN1,3, Haibin YU1()
1 Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Key Laboratory of Marine New Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2 College of Materials Science and Engineering, Hunan University, Changsha 410006, China
3 School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315201, China
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Abstract  

On the basis of previous studies on bio-based furan inhibitors, the corrosion behavior of Q235 carbon steel in different concentration of hydrochloric acid solutions with FGE was studied by means of corrosion weight-loss measurement, Tafel polarization curve measurement and electrochemical impedance spectroscopy (EIS). Results show that when the concentration of FGE is 4.92×10-4 molL-1, the inhibition effect for Q235 carbon steel achieves the optimum with the inhibition efficiency of more than 94.0% and the corrosion rate of 0.076 mgcm-2h-1. In addition, it is proved that the adsorption process of FGE on Q235 carbon steel is in accord with the Langmuir adsorption model, which is the result of the interaction of physical adsorption and chemical adsorption.
Key words:  Bio-based      Furan inhibitor      FGE      Q235 carbon steel      Langmuir adsorption model     
Received:  28 June 2017     
ZTFLH:  TG174.4  
Fund: Supported by China Postdoctoral Science Foundation (2015A610048)
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Wanjun PENG
Jiheng DING
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Haibin YU

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Wanjun PENG, Jiheng DING, Hao CHEN, Haibin YU. Corrosion Inhibition of Bio-based Inhibitor Furfuryl Glycidyl Ether. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 303-308.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.098     OR     https://www.jcscp.org/EN/Y2018/V38/I3/303

Fig.1  Three electrode test system of electrochemical working station
Fig.2  Polarization curves of Q235 carbon steel soaked in 0.5 mol/L hydrochloric acid solution with different concentrations of FGE for 3 h
FGE mol·L-1 -EcorrmV βaV·dec-1 -βcV·dec-1 IcorrμA·cm-2 RpΩ·cm-2
0 543 12.46 10.13 112.40 171
1.64×10-4 536 10.56 7.18 26.43 927
3.28×10-4 553 6.78 4.30 16.98 2312
4.92×10-4 564 7.80 5.04 11.74 2883
6.56×10-4 545 8.12 4.99 19.83 1672
Table 1  Electrochemical parameters obtained by fitting Tafel curves
Fig.3  AC impedance spectra of Q235 carbon steel immersed in 0.5 mol/L hydrochloric acid solution with different concentrations of FGE for 3 h (a) and corresponding equivalent circuit diagram (b)
FGEmol·L-1 RsΩ·cm2 QdlμF·cm2·Hz1-n n RctΩ·cm2 PE%
0 3.27 1.45×10-4 0.81 1.33×102 ---
1.64×10-4 4.71 4.20×10-5 0.76 9.26×102 81.6
3.28×10-4 5.13 3.20×10-5 0.60 1.84×103 92.7
4.92×10-4 3.35 1.50×10-5 0.63 2.22×103 94.0
6.56×10-4 3.34 3.40×10-5 0.72 1.57×103 91.5
Table 2  Fitting electrochemical parameters of EIS
FGE / mol·L-1 V / mg·cm-2·h-1 θ CR / %
0 1.164 --- ---
1.64×10-4 0.201 0.827 82.7
3.28×10-4 0.076 0.935 93.5
4.92×10-4 0.043 0.963 96.3
6.56×10-4 0.093 0.920 92.0
Table 3  Mass loss test results of Q235 carbon steel in 0.5 mol/L hydrochloric acid solution with different concentrations of FGE
Fig.4  SEM images of Q235 carbon steel after soaking for 3 h in hydrochloric acid solutions with (a) and without (b) 4.92×10-4 mol/L FGE
C / molL-1 Kads / L·mol-1 ΔG 0ads / kJ·mol-1
0 --- ---
1.64×10-4 2.91×104 -3.54×104
3.28×10-4 4.39×104 -3.64×104
4.92×10-4 5.29×104 -3.69×104
6.56×10-4 1.75×104 -2.82×104
Table 4  Adsorption parameters of FGE on Q235 carbon steel
Fig.5  Langmuir adsorption isotherm of FGE (a) and adsorption mechanism of FGE on Q235 carbonsteel (b)
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