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Development and optimization of Zn–Ni–TiO2 composite coating, assessment of its corrosion resistance and antimicrobial activity

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Abstract

Zn–Ni–TiO2 composite coating was developed through response surface methodology. The current density and concentration of TiO2 were optimized to obtain a minimum corrosion rate. The optimized condition obtained from the central composite design achieved a minimum experimental corrosion rate of 0.122 mm/year as a response for the Zn–Ni–TiO2 composite coating with a current density of 2.91 A/dm2 and concentration of TiO2 4.9 g/L. The potentiodynamic polarization and electrochemical impedance spectroscopic method was used to measure the corrosion resistance. The antimicrobial activity of the composite coating was assessed. Growth of Gram-negative and -positive microbes was observed on the polished mild steel. However, the composite coating exhibited resistance to Gram-negative microorganisms. Surface characterization was carried out using scanning electron microscopy (SEM) along with energy-dispersive X-ray spectroscopy depicting the presence of Zn, Ni, Ti, and O elements in the composite coating. Atomic force microscopy confirmed the surface roughness and heterogeneous distribution of crystal grain.

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Acknowledgements

The authors would like to thank the college authorities and management (Nitte Education Trust, Mangaluru) for completely funding the research work.

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Correspondence to Vinayaka B. Shet.

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Shet, V.B., Bhat, R.S., Selvaraj, R. et al. Development and optimization of Zn–Ni–TiO2 composite coating, assessment of its corrosion resistance and antimicrobial activity. Appl Nanosci 11, 2469–2477 (2021). https://doi.org/10.1007/s13204-021-02029-6

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  • DOI: https://doi.org/10.1007/s13204-021-02029-6

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