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Journal of Chinese Society for Corrosion and protection  2022, Vol. 42 Issue (4): 629-637    DOI: 10.11902/1005.4537.2021.214
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Corrosion Inhibition on Carbon Steel in Acidic Solution by Carbon Dots Prepared from Waste Longan Shells
CHEN Jiaqi, HOU Daolin, XIAO Han, GAO Yuwei, DONG Sheying()
School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710311, China
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Abstract  

In order to develop new environment-friendly corrosion inhibitors of high corrosion inhibition efficiency, longan shell carbon dots (ls-CDs) and nitrogen doped longan shell carbon dots (N-lsCDs) were synthesized by calcination and one-pot hydrothermal methods, respectively. Meantime, the structural, composition, optical property, and corrosion inhibition performance of ls-CDs and N-lsCDs were assessed by means of FT-IR, FL, XPS, TEM, electrochemical method, and static mass loss method. Results showed that when the concentration of ls-CDs and N-lsCDs was 100 and 20 mg·L-1 in 1 mol·L-1 HCl solution, the corresponding corrosion inhibition efficiency for Q235 steel reaches 89.49% and 92.41% respectively. Besides, the N-lsCDs present advantages, such as excellent corrosion inhibition performance in low dosage etc., and it is especially noticeable that the N-lsCDs could be produced from the longan shell as waste. The polarization curve test results showed that N-lsCDs is a mixed inhibitor, and the adsorption of N-lsCDs on the surface of carbon steel conforms to the Langmuir adsorption isotherm. Using biomass as raw material to prepare new environment-friendly corrosion inhibitor can turn waste into resources, which has attractive potential application prospects.

Key words:  carbon steel corrosion inhibitor      biomass      carbon dot      adsorption     
Received:  26 August 2021     
ZTFLH:  TG174.42  
Fund: National Innovation and Entrepreneurship Training Program for College Students(202010703056);Shaanxi Province Key R&D Program(2020GY-306)
Corresponding Authors:  DONG Sheying     E-mail:  dongsyy@126.com
About author:  DONG Sheying, E-mail: dongsyy@126.com

Cite this article: 

CHEN Jiaqi, HOU Daolin, XIAO Han, GAO Yuwei, DONG Sheying. Corrosion Inhibition on Carbon Steel in Acidic Solution by Carbon Dots Prepared from Waste Longan Shells. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 629-637.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.214     OR     https://www.jcscp.org/EN/Y2022/V42/I4/629

Fig.1  Fluorescence spectra of ls-CDs (a) and N-lsCDs (b) with different concentrations and FT-IR spectra of ls-CDs and N-lsCDs (c)
Fig.2  EIS of Q235 steel in 1 mol·L-1 HCl solutions containing different concentrations of ls-CDs (a) and N-lsCDs (b)
Inhibitor

Conc.

mg·L-1

Rs

Ω·cm2

Rct

Ω·cm2

Cdl

μF·cm2

n

η

%

01.4334.22240.8770
251.4752.31980.87434.62
ls-CDs501.39205.51390.84884.39
751.46251.01150.83286.54
1001.55325.91140.83589.49
01.4234.3224.80.8780
51.19234.8131.50.87485.41
N-lsCDs101.55270.8112.80.85387.32
151.31289.7113.70.83788.07
201.25451.8111.90.82592.41
Table 1  Fitting impedance parameters of Q235 steel in 1 mol·L-1 HCl solutions containing different concentrations of ls-CDs and N-lsCDs
Fig.3  Polarization curves of Q235 steel in 1 mol·L-1 HCl solutions containing different concentrations of ls-CDs (a) and N-lsCDs (b)
Inhibitor

Conc.

mg·L-1

βa

dec·V

Icorr

A·cm-2

η

%

ls-CDs0-9.766.8×10-40
25-13.682.8×10-444.89
50-15.028.1×10-588.01
75-14.668.6×10-587.33
100-15.885.7×10-591.61
N-lsCDs5-15.626.4×10-590.72
10-16.555.9×10-591.34
15-15.964.9×10-592.71
20-16.494.2×10-593.84
Table 2  Fitting parameters of polarization curves of Q235 steel in 1 mol·L-1 HCl solutions containing different concentrations of ls-CDs and N-lsCDs
Fig.4  TEM image and particle size distribution of N-lsCDs
Fig.5  General XPS spectra of N-lsCDs (a) and fine spectra of C1s (b), O1s (c) and N1s (d)
Fig.6  Variations of corrosion rate (a) and inhibition efficiency (b) with the concentration of N-lsCDs
C / mg·L-1303 K313 K323 K
CR / g·m-2·h-1η / %CR / g·m-2·h-1η / %CR / g·m-2·h-1η / %
06.25010.12015.620
50.9480.912.7872.567.5152.47
100.8187.042.4875.587.1853.91
150.7588.722.2477.846.9556.72
200.5092.042.0180.326.7256.81
Table 3  Corrosion rates and inhibition efficiencies of Q235 steel in 1 mol·L-1 HCl solutions containing different concentrations of N-lsCDs at different temperatures
T / ℃Rs / Ω·cm2Rct / Ω·cm2Cdl / μF·cm2η / %
201.303399.0118.1291.50
301.251451.8111.9192.41
401.173132.5120.6174.44
501.03666.9143.0649.28
Table 4  Impedance parameters of Q235 steel in 1 mol·L-1 HCl solution containing 20 mg·L-1 N-lsCDs at different temperatures
T / ℃Ecorr / Vβa / mV·dec-1Icorr / A·cm-2η / %
20-0.46414.704.2×10-593.74
30-0.45316.494.2×10-593.83
40-0.46115.811.3×10-480.02
50-0.45914.732.8×10-458.11
Table 5  Polarization parameters of Q235 steel in 1 mol·L-1 HCl solution containing 20 mg·L-1 N-lsCDs at different temperatures
Fig.7  Arrhenius diagrams of Q235 steel in 1 mol·L-1 HCl solution containing different concentrations of N-lsCDs
Fig.8  Transition state diagrams of Q235 steel in 1 mol·L-1 HCl solution containing different concent-rations of N-lsCDs
Fig.9  Adsorption isotherms of N-lsCDs on Q235 steel in 1 mol·L-1 HCl solution
Fig.10  Contact angles of pure water drop on Q235 steel immersed for 8 h in 1 mol·L-1 HCl solutions containing free (a) and 20 mg·L-1 N-lsCDs (b)
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