Inhibition effect of Cynara cardunculus leaf extract on corrosion of St37 steel immersed in seawater with and without bleach solution

The inhibition performance of an aqueous extract of Cynara cardunculus leaves on the corrosion of St37 steel immersed in seawater and seawater with bleach was investigated using weight loss measurements, electrochemical methods, and surface characterization techniques. It was found that the extract...

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Bibliographic Details
Published in:Chemical engineering communications 2021-09, Vol.208 (9), p.1260-1278
Main Authors: Lahbib, Hana, Ben Hassen, Samia, Gerengi, Hüsnü, Ben Amor, Yasser
Format: Article
Language:English
Subjects:
Adsorption
Bleach
Bleaches
Chemisorption
Corrosion effects
Cynara cardunculus leaf extract
Electrochemical impedance spectroscopy
Fourier transforms
Infrared radiation
Low carbon steels
orrosion
Phenols
Seawater
Spectrum analysis
St37 steel
Surface chemistry
Surface properties
Weight loss measurement
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Summary:The inhibition performance of an aqueous extract of Cynara cardunculus leaves on the corrosion of St37 steel immersed in seawater and seawater with bleach was investigated using weight loss measurements, electrochemical methods, and surface characterization techniques. It was found that the extract components acted primarily as a mixed-type inhibitor, and inhibition efficiency increased with increasing inhibitor concentration. Electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS) confirmed the formation of a protective layer on the metallic surface in both solutions. The adsorption of inhibiting molecules conformed to the Langmuir isotherm model. The thermodynamic parameter values indicated that chemisorption constituted the major contribution to the adsorption process. This result was corroborated by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analyses. The significant inhibition effect can be related to the large amount of phenolic compounds in the CC aqueous extract as revealed by the Fourier-transform infrared (FTIR) spectrum.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986445.2020.1771320