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Journal of Chinese Society for Corrosion and protection  2022, Vol. 42 Issue (1): 85-92    DOI: 10.11902/1005.4537.2021.001
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Effect of Nitrogen Doping on Corrosion Inhibition Performance of Carbon Nanoparticles
WANG Jing, WANG Siyan, ZHANG Chong, WANG Wentao, CAO Xing, FAN Ning, XU Hongyan()
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
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Abstract  

Nitrogen-free carbon nanoparticles (CNPs) were prepared by thermal decomposition method with citric acid as carbon source. While nitrogen-doped carbon nanoparticles (N-CNPs) were prepared by thermal decomposition method with citric acid as carbon source and urea as nitrogen source. The above nano-particles were characterized by means of atomic force microscope, infrared spectroscope and Raman spectroscope, and their corrosion inhibition performance for Q235 steel in 1 mol/L HCl solution was comparatively studied by mass loss method, electrochemical means and laser confocal scanning microscope. The results showed that the two carbon nanoparticles belonged to mixed-type corrosion inhibitors, the corrosion inhibition efficiency of N-free carbon nanoparticles was 37.5%, and the corrosion inhibition efficiency of the carbon nanoparticles was significantly improved after being doped with N. The corrosion inhibition efficiency of N-CNPs reached 90.96%.

Key words:  carbon nanoparticle      corrosion inhibitor      electrochemical      Q235 steel     
Received:  04 January 2021     
ZTFLH:  TG174.42  
Fund: Natural Science Foundation of Shanxi Province(201901D111175)
Corresponding Authors:  XU Hongyan     E-mail:  xuhongyan@nuc.edu.cn
About author:  XU Hongyan, E-mail: xuhongyan@nuc.edu.cn

Cite this article: 

WANG Jing, WANG Siyan, ZHANG Chong, WANG Wentao, CAO Xing, FAN Ning, XU Hongyan. Effect of Nitrogen Doping on Corrosion Inhibition Performance of Carbon Nanoparticles. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 85-92.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2021.001     OR     https://www.jcscp.org/EN/Y2022/V42/I1/85

Fig.1  AFM 2D images (a, c) and height curves (b, d) of CNPs (a, b) and N-CNPs (c, d)
Fig.2  FT-IR spectra of CNPs and N-CNPs
Fig.3  Raman spectrum of N-CNPs
Fig.4  Corrosion rates (a) and corrosion inhibition efficiencies (b) of Q235 steel in 1 mol/L HCl solutions containing 0, 10, 25 and 50 mg/L CNPs, and N-CNPs
InhibitorConcentrationInhibition efficiency
Pyridazinium-based ionic liquids[13]1000 mg/L84.0%
Schinopsis lorentzii extract[14]2000 mmol/L63.0%
Soybean meal extract[15]200 mg/L80%
N-CDs[16]100 mg/L88.93%
N-CNPs50 mg/L90.96%
Table 1  Comparison of the inhibition efficiencies of N-CNPs and other reported corrosion inhibitors for Q235 steel in 1 mol/L HCl solution
Fig.5  Potential polarization curves (a) and corresponding Evans polarization plots (b) for Q235 steel in 1 mol/L HCl solutions without and with 50 mg/L CNPs or 50 mg/L N-CNPs
ConcentrationEcorr / V vs. SCEIcorr / A·cm-2ba / mV·dec-1bc / mV·dec-1Inhibition efficiency
1 mol/L HCl-0.442.441×10-489.57492.868---
50 mg/L CNPs-0.4628.097×10-583.93592.58466.82%
50 mg/L N-CNPs-0.4823.029×10-593.49292.80787.59%
Table 2  Fitting parameters of polarization curves of Q235 steel in 1 mol/L HCl solutions without and with 50 mg/L CNPs or 50 mg/L N-CNPs
Fig.6  Nyquist plots (a) and equivalent circuit diagrams (b, c) for Q235 steel in 1 mol/L HCl solutions without (b) and with (c) 50 mg/L CNPs or 50 mg/L N-CNPs
Fig.7  LSCM images of Q235 steel before (a) and after immersion for 24 h in 1 mol/L HCl solutions without (b) and with 50 mg/L CNPs (c) and 50 mg/L N-CNP (d) ((a) Ra=0.047 μm, (b), Ra=1.328 μm, (c) Ra=0.930 μm, (d) Ra=0.335 μm)
Concentration / mg·L-1L1 / HRs / Ω·cm2Qdl / F·cm-2n1Rct / Ω·cm2L2 / HRL / Ω·cm2χ2Inhibition efficiency
1 mol/L HCl7.934×10-71.8618.095×10-40.91485.2------2.87×10-4---
50 mg/L CNPs6.652×10-71.7312.341×10-40.902202.8139.315.954.09×10-456.5%
50 mg/L N-CNPs6.409×10-71.7008.974×10-50.888660.3300.230.36.43×10-487.10%
Table 3  Fitting parameters of EIS of Q235 steel in 1 mol/L HCl solutions without and with 50 mg/L CNPs or N-CNPs
Fig.8  Langmuir adsorption isotherms of Q235 steel in 1 mol/L HCl solutions containing CNPs (a) and N-CNPs (b)
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