Comparative Study of Corrosion Performance of HVOF-Sprayed Coatings Produced Using Conventional and Suspension WC-Co Feedstock

Rehan Ahmed, G. Vourlias, Ahmed Algoburi, C. Vogiatzis, D. Chaliampalias, S. Skolianos, L. M. Berger, S. Paul, N. H. Faisal, F. L. Toma, Nayef M. Al-Anazi, Matheus F. A. Goosen

Research output: Contribution to journalArticle

2 Citations (Scopus)
32 Downloads (Pure)

Abstract

Corrosion properties of nanostructured coatings deposited by suspension high-velocity oxy-fuel (S-HVOF) via an aqueous suspension of milled WC-Co powder were compared with conventional HVOF-sprayed coatings. Microstructural evaluations of these coatings included x-ray diffraction and scanning electron microscopy equipped with an energy-dispersive x-ray spectroscopy. The corrosion performance of AISI440C stainless steel substrate and the coatings was evaluated in a 3.5 wt.% NaCl aqueous solution at ~ 25 °C. The electrochemical properties of the samples were assessed experimentally, employing potentiodynamic polarization and electrochemical impedance spectroscopy. The potentiodynamic polarization results indicated that coatings produced by S-HVOF technique show lower corrosion resistance compared with the coatings produced by HVOF-JK (HVOF Jet Kote) and HVOF-JP (HVOF JP5000) techniques. Results are discussed in terms of corrosion mechanism, Bode and Nyquist plots, as well as equivalent circuit models of the coating–substrate system.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalJournal of Thermal Spray Technology
Early online date30 Oct 2018
DOIs
Publication statusE-pub ahead of print - 30 Oct 2018

Keywords

  • corrosion
  • HVOF
  • nanostructured coatings
  • S-HVOF
  • suspension spraying
  • WC-Co feedstock

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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