The inhibition performance of heterocyclic compounds on Q235 steel in methanol/formic acid medium: Experimental and theory

2021 ◽  
Vol 343 ◽  
pp. 117663
Author(s):  
Jia Wang ◽  
Jinyan Liu ◽  
Qian Liu ◽  
Yao Chong
Keyword(s):  
Formic Acid ◽  
Acid Medium ◽  
Heterocyclic Compounds ◽  
Q235 Steel ◽  
Inhibition Performance

Spectrophotomhtric Determination of Vanadium with Salicylic Acid in Formic Acid Medium

1985 ◽  
Vol 18 (14) ◽  
pp. 1733-1742
Author(s):  
Anna C. P. Baptista ◽  
Henrique A. Salles andrade
Keyword(s):  
Salicylic Acid ◽  
Formic Acid ◽  
Acid Medium

Study of the Inhibition Mechanism of Imidazoline Derivative Inhibitor on CO2 Corrosion for Q235 Steel

2009 ◽  
Vol 79-82 ◽  
pp. 981-984 ◽  
Author(s):  
Bin Wang ◽  
Min Du ◽  
Jing Zhang
Keyword(s):  
Chemical Analysis ◽  
Quantum Chemical ◽  
Electrochemical Impedance ◽  
Anodic Process ◽  
Inhibition Mechanism ◽  
Quantum Chemical Analysis ◽  
Gas Field ◽  
Q235 Steel ◽  
Inhibition Performance ◽  
Imidazoline Derivative

Imidazoline derivative inhibitors are successfully used in oil-gas field for CO2 and H2S corrosion. The inhibition performance and inhibition mechanism of imidazoline with thioureido to prevent corrosion of steel in saltwater saturated with CO2 were studied by polarization curves and electrochemical impedance spectroscopy (EIS), in the meantime, quantum chemical analysis was used to analysis the results. The results of electrochemical measurements indicated that the inhibitor belonged to mixed-type inhibitor which mainly inhibited anodic process and worked as “negative catalysis”. The inhibition efficiencies increased then decreased with the increase in inhibitor concentration. The electrochemical results have also been supplemented by quantum chemical analysis. It was found that the chemical adsorption of the imidazoline with thioureido molecule on Q235 steel depended on the imidazoline ring and thioureido, thus the inhibitor had good corrosion inhibition.

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