Abstract
The flame sprayed aluminum coatings are widely used in the marine industries due to considerable corrosion resistance, but their tribological weakness is a drawback. In this study, Al and Al–(5–10 and 15%)TiO2 composites were flame sprayed on carbon steel to combine corrosion and wear resistance. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to study the coatings and worn and corroded surfaces. Polarization and electrochemical impedance spectroscopy (EIS) tests in simulated 3.5% NaCl solution were used to investigate corrosion behavior of coatings. Also, the pin-on-disc test was used to investigate tribological behavior. The tribological study showed that the composite coating of 5 and 10% TiO2 had better wear resistance than pure aluminum and Al–15% TiO2 coatings. The main wear mechanism in composite coatings was delamination, while pure aluminum coating delamination and adhesion mechanisms were dominant. The corrosion study showed that the corrosion potential of Al‒10% TiO2 coating is nobler than other coats, and pitting corrosion was realized via the dominant corrosion mechanism in all coatings.
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Salimi, N., Bayat, O. & Heidarpour, A. Investigation of TiO2 Addition on Tribological and Corrosion Behavior of Flame Sprayed Al Coating. Phys. Metals Metallogr. 121, 1431–1439 (2020). https://doi.org/10.1134/S0031918X20140148
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DOI: https://doi.org/10.1134/S0031918X20140148