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

Vinayaka B. Shet, Ramesh S. Bhat, Raja Selvaraj, Prasad Guru Prasad, Amogh Kodgi, Anurag Damodaran, Akshara Savithri

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
JournalApplied Nanoscience (Switzerland)
DOIs
Publication statusAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physical and Theoretical Chemistry
  • Cell Biology
  • Electrical and Electronic Engineering

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