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Journal of Chinese Society for Corrosion and protection  2019, Vol. 39 Issue (3): 267-273    DOI: 10.11902/1005.4537.2018.118
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Inhibition Effect of Soybean Meal Extract on Corrosion of Q235 Steel in Hydrochloric Acid Medium
Xia WANG(),Shuaifei REN,Daixiong ZHANG,Huan JIANG,Yue GU
School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
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Abstract  

The inhibition effect of soybean meal extract (SME) on the corrosion of Q235 carbon steel in 1 mol/L HCl solution was investigated by weight loss method, potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy and scanning electron microscope. The inhibition efficiency increased and then decreased with the increasing temperature in the range of 25~90 ℃. With a dose of 0.8 g/L SME, the inhibition efficiency was 92% at 40 ℃, and the SME acted as a mixed-type inhibitor. The adsorption of SME on Q235 steel accorded with Langmuir isothermal equation, and including chemical and physical adsorption.

Key words:  soybean meal      plant corrosion inhibitor      Q235 steel      polarization curve      electrochemical impedance spectroscopy     
Received:  25 August 2018     
ZTFLH:  TG174.42  
Fund: National Natural Science Foundation of China(51774242)
Corresponding Authors:  Xia WANG     E-mail:  swpi_wx@126.com

Cite this article: 

Xia WANG,Shuaifei REN,Daixiong ZHANG,Huan JIANG,Yue GU. Inhibition Effect of Soybean Meal Extract on Corrosion of Q235 Steel in Hydrochloric Acid Medium. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 267-273.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2018.118     OR     https://www.jcscp.org/EN/Y2019/V39/I3/267

Fig.1  
Fig.2  
Fig.3  
Concentrationg/L

-Ecorr

mV

Icorr

μA·cm-2

βa

mV·dec-1

-βc

mV·dec-1

η

%

Rd

%

Blank440113488115------
0.2472205104103810.8
0.4470124105168891.1
0.645411081107901.4
0.848296106117911.2
Table 1  
Fig.4  
Fig.5  
Concentration / g·L-1Cdl / μF·cm-2nRp / Ω·cm2η / %
Blank2830.914---
0.22010.87480
0.41570.912087
0.61440.916491
0.81110.918892
Table 2  
Fig.6  
Temperature / ℃SlopeR2
251.040.98
401.010.99
551.110.98
701.150.99
Table 3  
Fig.7  

Temperature

K

ΔGads

kJ·mol-1

ΔHads

kJ·mol-1

ΔSads

J·mol-1·K-1

298-22.09-37.01-50.06
313-24.85-37.01-38.84
328-23.80-37.01-40.27
343-26.97-37.01-29.27
Table 4  
Fig.8  
Fig.9  
PositionFeNCl
193.45------
270.03---0.27
387.871.02---
Table 5  
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