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Journal of Chinese Society for Corrosion and protection  2021, Vol. 41 Issue (4): 469-476    DOI: 10.11902/1005.4537.2020.100
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Food Spices 2,5-Dihydroxy-1,4-dithiane as an Eco-friendly Corrosion Inhibitor for X70 Steel in 0.5 mol/L H2SO4 Solution
TAN Bochuan1, ZHANG Shengtao1(), LI Wenpo1, XIANG Bin1, QIANG Yujie2
1.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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Abstract  

The corrosion inhibition performance of 2,5-Dihydroxy-1,4-dithiane (DDD) for X70 pipeline steel in 0.5 mol/L sulfuric acid solution was studied via experimental and theoretical means. Electrochemical experimental data show that DDD can effectively inhibit the corrosion of X70 steel in sulfuric acid solution. The corrosion inhibition efficiency of DDD can reach 93.6% at 298 K. In addition, DDD can still exhibit good corrosion inhibition performance at higher temperatures. The adsorption of DDD on the surface of X70 steel is consistent with Langmuir single layer adsorption. Results of quantum chemical calculation and molecular dynamics simulation also proved the above adsorption and inhibition mechanism of DDD on steel deduced from experimental results.

Key words:  corrosion inhibitor      food spice      sulfuric acid      Langmuir adsorption      quantum chemistry calculation     
Received:  11 June 2020     
ZTFLH:  TG174  
Fund: National Natural Science Foundation of China(21878029);Chongqing Graduate Student Research Innovation Project(CYB19032);Sail Plan of Guangdong, China(2015YT02D025)
Corresponding Authors:  ZHANG Shengtao     E-mail:  stzhangcqu@163.com
About author:  ZHANG Shengtao, E-mail: stzhangcqu@163.com

Cite this article: 

TAN Bochuan, ZHANG Shengtao, LI Wenpo, XIANG Bin, QIANG Yujie. Food Spices 2,5-Dihydroxy-1,4-dithiane as an Eco-friendly Corrosion Inhibitor for X70 Steel in 0.5 mol/L H2SO4 Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 469-476.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2020.100     OR     https://www.jcscp.org/EN/Y2021/V41/I4/469

Fig.1  Molecular structure of DDD
Fig.2  Nyquist (a) and Bode (b) plots of X70 steel immersed at 298 K in 0.5 mol/L H2SO4 solutions with different concentrations of DDD
Fig.3  Nyquist (a, c) and Bode (b, d) plots of X70 steel immersed at 298~313 K in 0.5 mol/L H2SO4 solutions with (a, b) and without (c, d) 5 mmol/L DDD
C / mmol·L-1Rs / Ω·cm2Y0×10-6 / S·sn·cm-2nCdl / μF·cm-2Rct / Ω·cm2L / Ω·cm2RL / Ω·cm2η / %
Blank DDD0.78227.20.91141.128.3161.2233.5---
0.52.24163.20.89101.3125.1155.3179.277.4
10.78107.40.9172.7163.7------82.7
21.4396.40.8753.5243.5------88.4
50.9353.70.9034.5443.4------93.6
Table 1  Fitting parameters of EIS of X70 steel immersed at 298 K in 0.5 mol/L H2SO4 solutions without and with different concentrations of DDD
T / KC / mmol·L-1Rs / Ω·cm2Y0×10-6 / S·sn·cm-2nCdl / μF·cm-2Rct / Ω·cm2L / Ω·cm2RL / Ω·cm2η / %
29800.78227.20.91141.128.3161.2233.5---
50.9353.70.9034.5443.4------93.6
30300.88193.60.93100.325.1215235.6---
50.9268.50.9147.2365.7------93.1
30801.85316.50.87155.223.551.1169.5---
51.3667.10.8840.8338.1------93.0
31300.57160.20.97134.318.1182.4134.1---
51.3084.20.9055.6254.8------92.8
Table 2  Fitting parameters of EIS of X70 steel immersed at different temperatures in 0.5 mol/L H2SO4 solutions without and with different concentrations of DDD
Fig.4  Equivalent circuit diagrams for fitting EIS of X70 steel in 0.5 mol/L H2SO4 solutions with (a) and without (b) inductance
Fig.5  Polarization curves of X70 steel in 0.5 mol/L H2SO4 solutions with different concentrations of DDD at 298 K (a), with (b) and without (c) 5 mmol/L DDD at different temperatures
C / mmol·L-1Ecorr / V/SCEIcorr / μA·cm-2βc / mV·dec-1βa / mV·dec-1η / %
Blank DDD-0.468520.7-146.744.9---
0.5-0.473107.6-98.360.479.3
1-0.47381.2-99.545.684.4
2-0.49053.6-106.879.689.7
5-0.50330.2-114.087.994.2
Table 3  Fitting parameters of polarization curves of X70 steel immersed in 0.5 mol/L H2SO4 solutions with different concentrations of DDD
T / KC / mmol·L-1Ecorr / V/SCEIcorr / μA·cm-2βc / mV·dec-1βa / mV·dec-1η / %
2980-0.468520.7-146.744.9---
5-0.50330.2-114.087.994.2
3030-0.474543.2-148.256.2---
5-0.48335.8-104.692.193.4
3080-0.475552.9-140.455.4---
5-0.50037.6-109.898.993.2
3130-0.467568.1-138.958.9---
5-0.47540.3-110.682.292.9
Table 4  Fitting parameters of polarization curves of X70 steel immersed in 0.5 mol/L H2SO4 solution without DDD at different temperatures
Fig.6  Fitting curves of Langmuir (a), El-Awady (b), Flory-Huggins (c), Freundlich (d), Frunkin (e) and Temkin (f) isothermal adsorption models
Fig.7  SEM images of X70 steel before (a) and after immersion at 298 K for 4 h in 0.5 mol/L H2SO4 solution with (b) and without (c) 5 mmol/L DDD
Fig.8  Optimized configuration (a), electrostatic potential map (b), and distributions of electron clouds of HOMO (c) and LUMO (d) orbitals of DDD molecular
Fig.9  Stable adsorption configuration of DDD molecule on Fe (110) surface: (a) side view, (b) top view
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