CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4760-4772.doi: 10.11949/0438-1157.20200065

• Surface and interface engineering • Previous Articles     Next Articles

High efficient corrosion inhibition of steel by nano-micro aggregates of Sapindus mukorossi Gaertn peel extracts

Xue LUO1(),Haijun HUANG1(),Ziping LUO1,Zhiyong WANG1,Xiaojing MU1,Hongru LI1,Xinchao WANG1,2,Shengtao ZHANG1,Fang GAO1()   

  1. 1.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
    2.College of Pharmacy, Heze University, Heze 274015, Shandong, China
  • Received:2020-01-16 Revised:2020-04-13 Online:2020-10-05 Published:2020-05-09
  • Contact: Fang GAO E-mail:xueluo1994@163.com;hhjbfn@163.com;fanggao1971@gmail.com

Abstract:

To seek green, sustainable and natural plant extracts with the potential for large-scale application as corrosion inhibitors, this article selects the extracts of the Sapindus mukorossi Gaertn peels with surfactant properties as the research object. Hence, this article uses Sapindus mukorossi Gaertn peel extracts (SMGPE) with surfactant properties as the study candidate. This survey presents efficient extraction of Sapindus mukorossi Gaertn peels by simply refluxing ethanol solution. It is shown that SMGPE can process orderly nano-micro meters aggregation in DMF/HCl (volume ratio: 50/50, 1.0 mol/L HCl solution) mixed solution through self-organization at the room temperature.The results show that the predominantly strong chemical adsorption of formed SMGPE aggregates on the studied Q235 steel specimens is suggested through the detection of FT-IR, Raman as well as XPS spectroscopy. This study further determines the corrosion inhibition effect of the stable SMGPE aggregates for the studied steel specimens in 1.0 mol/L HCl aqueous solution based on electrochemical method. The results suggest that the SMGPE aggregates can inhibit corrosion of the steel specimens in HCl solution efficiently, and the greatest corrosion inhibition efficiency is over 90%.

Key words: self-aggregation, adsorption, steel, HCl solution, corrosion

CLC Number: 

  • TG 178

Fig.1

Chemical structures of the main molecular constituents in Sapindus mukorossi Gaertn peel extract (SMGPE)"

Fig.2

Diagrammatic drawing of the formation of SMGPE aggregates and the preparation of the stable SMGPE aggregates protection film on the studied steel specimen surface"

Fig.3

OCP versus time curves in 1.0 mol/L HCl solutions for the investigated unmodified steel electrodes and the stable SMGPE aggregates of different concentrations covered steel electrodes"

Fig.4

SEM images of SMGPE aggregates in DMF/HCl (vol ratio 50/50,1.0 mol/L HCl solution) mixed solution at different aggregation time"

Fig.5

SEM images of SMGPE aggregates in DMF/HCl (vol ratio 50/50,1.0 mol/L HCl solution) mixed solution with different concentrations from 0.1 to 0.6 g/L at 10 h evolution time"

Fig.6

FT-IR spectrum of original SME powder (a); FT-IR spectrum of the stable SMGPE aggregates (aggregation concentration 0.5 g/L, aggregation time 10 h)adsorbed on the studied steel specimen surfaces (b)"

Fig.7

Fe 2p XPS spectra from the surfaces of the investigated bare steel immersed in HCl solution for 1 h (a); Fe 2p XPS spectra from the studied steel specimens treated by the stable SMGPE aggregates (aggregation concentration 0.5 g/L, aggregation time 10 h) immersed in HCl solution for 1 h (b)"

"

样品化学状态结合能/eV半峰宽/eV
空白钢片Fe2O3/Fe3O4/FeOOH710.383.45
FeCl3712.473.5
吸附稳定SMGPE聚集体的钢片Fe0707.311.75
Fe2O3/ Fe3O4709.102.00
FeOOH710.902.00

Fig.8

C 1s XPS spectra from surfaces of the investigated bare steel immersed in HCl solution (1.0 mol/L HCl) for 1 h (a); C 1s XPS spectra from surfaces of the studied steel specimens treated by stable SMGPE aggregates (aggregation concentration 0.5 g/L, aggregation time 10 h) immersed in 1.0 mol/L HCl solution for 1 h (b)"

"

样品化学状态结合能/eV半峰宽/eV
空白钢片C—C/CC284.901.62
C—O285.791.55
CO288.432.00
吸附稳定SMGPE聚集体的钢片C—C/CC284.982.06
C—O287.031.90
CO288.682.30

Fig.9

O 1s XPS spectra from surfaces of the investigated bare steel immersed in 1.0 mol/L HCl solution for 3 h; O 1s XPS spectra from surfaces of the studied steel specimens treated by stable SMGPE aggregates (aggregation concentration 0.5 g/L, aggregation time 10 h) immersed in HCl solution for 1 h"

Table 3

De-convolution parameters including chemical states, binding energies and FWHMs of O 1s XPS spectra peaks obtained from surfaces of the studied bare steel specimen and the studied steel specimens treated by stable SMGPE aggregates immersed in 1.0 mol/L HCl solution for 1 h (aggregation concentration, 0.5 g/L, aggregation time, 10 h)"

样品化学状态结合能/eV半峰宽/eV
空白钢片Fe2O3/ Fe3O4530.922.00
FeOOH531.611.80
吸附稳定SMGPE聚集体的钢片Fe2O3/ Fe3O4530.241.90
FeOOH531.551.75
CO/C—O533.411.60

Fig.10

SEM micrographs of the studied steel specimen surfaces"

Fig.11

Potentiodynamic polarization curves in 1 mol/L HCl solutions for the investigated unmodified steel electrodes and the stable SMGPE aggregates of different concentrations (aggregation time 10 h) covered steel electrodes"

Table 4

Polarization parameters for the studied unmodified and modified steel specimens by different concentrations of stable SMGPE aggregates (aggregation time 10 h) in 1.0 mol/L HCl solution"

电极极化参数
C/(g/L)Ecorr (vs. SCE) /VIcorr/(A/cm2)βc/(V/dec)βa/(V/dec)ηj/%
空白钢电极-0.4804.387×10-7-0.12780.1068
稳定SMGPE聚集体吸附的钢电极0.1-0.4471.004×10-7-0.11460.058577.11
0.2-0.4424.957×10-8-0.11750.050888.7
0.3-0.4374.549×10-8-0.12330.051589.63
0.5-0.4302.820×10-8-0.12260.042493.57
0.6-0.4403.767×10-4-0.12120.052491.41

Fig.12

Nyquist curves for the studied naked steel electrodes and SMGPE aggregates (aggregation time 10 h) of various concentrations covered steel electrodes(a); Bode plots for the studied naked steel electrodes (b) and SMGPE aggregates (aggregation time 10 h) of various concentrations covered steel electrodes (c)"

Fig.13

Equivalent circuit models fitting the EIS experimental data in this study"

Table 5

Electrochemical impedance parameters for the studied unmodified and different concentrations of stable SMGPE aggregates (aggregation time 10 h) modified steel specimens in 1.0 mol/L HCl solution"

电极C/ (g/L)电化学参数χ2
Rs/ (Ω·cm2)Rct / (Ω·cm2)Cdl / (F/cm2)nηE /%
空白钢电极0.609644.361.408×10-70.95514.81×103
SMGPE聚集体吸附的钢电极0.10.8946182.06.34×10-80.883275.632.41×103
0.20.9725315.45.48×10-80.882985.941.52×103
0.30.9667451.24.49×10-80.870790.174.65×103
0.50.8991635.03.98×10-80.892893.011.95×103
0.61.2320484.44.46×10-80.886790.927.48×103

Fig.14

Langmuir adsorption isotherm of stable SMGPE aggregates on the studied steel specimen surfaces in 1.0 mol/L HCl solution at 298 K (yP to Tafel curves, yE to electrochemical impedance spectroscopy)"

Table 6

Thermodynamic parameters for the adsorption of SMGPE aggregates at 298 K"

测试方法吸附能ΔGads0/(J/mol)
Polarization-26790
EIS-26430
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