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Electrogalvanization using Zn-graphene oxide composite coatings with enhanced corrosion resistance performance

Abstract

Zn-based coatings are extensively used for the protection of steel structures. Efforts toward further enhancement in the corrosion resistance performance of Zn coatings are therefore an area of continued interest. In this work, Zn-graphene oxide (Zn-GO) composite coatings containing different volume fractions of GO were electrodeposited on mild steel substrates using an electrolyte bath with different concentrations of dispersed graphene oxide. The electrodeposition parameters used yielded compact and crack-free morphology for all the coatings. Incorporation of GO led to a refinement of the Zn crystallites in the coating matrix. Potentiodynamic polarization measurements clearly showed that all the Zn-GO composite coatings exhibited higher corrosion resistance performance when compared to the pristine Zn coatings, and further, the corrosion rate decreased with the increase in the volume fraction of the GO in the composite coatings.

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Acknowledgments

The authors acknowledge the research grant received from the CSIR Government of India.

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Correspondence to M. Y. Rekha.

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Rekha, M.Y., Srivastava, C. Electrogalvanization using Zn-graphene oxide composite coatings with enhanced corrosion resistance performance. J Coat Technol Res 18, 753–760 (2021). https://doi.org/10.1007/s11998-020-00439-9

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  • DOI: https://doi.org/10.1007/s11998-020-00439-9

Keywords

  • Electrogalvanization
  • Zn coatings
  • Graphene oxide
  • Corrosion