Abstract
The efficacy of nano-TiO2-containing zinc phosphate coatings on low-carbon steel is investigated. Zinc phosphate coatings are electrodeposited on low-carbon steel (AISI 1015) keeping current density, deposition time and wt % nano-TiO2 at their respective levels. Corrosion protection performance of these coatings was assessed using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl electrolyte. The morphology, the composition and the growth process of the zinc phosphate coating is investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, X-ray diffraction (XRD) and electrochemical measurements. The XRD study reveals that the obtained phosphate layer contains traces of hopeite and phosphophylite. The formed zinc phosphate coating offers high corrosion protection in 3.5% NaCl solution, which is well supported by EIS studies. The presence of nano-TiO2 in the phosphate bath anticipated to offer a better surface coverage and reduction in porosity and forms more homogeneous coating, which is in agreement with the SEM studies. The optimization of the electrodeposition phosphating process for achieving better responses in terms of corrosion rate and coating resistance is addressed in this paper.
Acknowledgments
The authors wish to express their thanks to Prof. B. B. Ahuja, Director, College of Engineering, Pune. The authors are also grateful to Dr. N. B. Dhokey, Head of the Department of Metallurgy and Materials Science, College of Engineering, Pune. V.S.K. gratefully acknowledges the ethical support from Prof. A. S. Adkine, Assistant Professor, Shreeyash College of Engineering and Technology, Aurangabad, by availing the software facilities.
Funding: The authors declare that there is no funding received (in any form) for this research/publication of this work and otherwise.
Conflict of interest statement: The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
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