Inhibitive effect of 8-hydroxyquinoline on corrosion of gray cast iron in automotive braking systems

The inhibition effect of 8-hydroxyquinoline (8-HQ) on the corrosion of gray cast iron rotors for automotive applications was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 0.1 M HCl solution. The experimental results suggest that the 8-hydroxyquinoline...

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Bibliographic Details
Published in:Electrochimica acta 2023-05, Vol.449, p.142221, Article 142221
Main Authors: Motta, M., Zanocco, M., Rondinella, A., Iodice, V., Sin, A., Fedrizzi, L., Andreatta, F.
Format: Article
Language:English
Subjects:
8-hydroxyquinoline
Cast iron rotor
Corrosion inhibitor
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Summary:The inhibition effect of 8-hydroxyquinoline (8-HQ) on the corrosion of gray cast iron rotors for automotive applications was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 0.1 M HCl solution. The experimental results suggest that the 8-hydroxyquinoline is a mixed inhibitor reducing both the anodic and the cathodic current densities. Besides, EIS results indicate that the inhibitor provides a stable protection over 9 days of exposure to the electrolyte due to the cooperative formation of an adsorbed layer of 8-HQ on the rotor and a top layer probably constituted by a complex between 8-HQ and iron. The presence of the adsorbed layer and the complex with 8-HQ was confirmed by means of Energy Dispersive X-ray analysis (EDX) and Fourier-transform spectroscopy (FT-IR).
ISSN:0013-4686
DOI:10.1016/j.electacta.2023.142221