Corrosion behaviour of magnetron sputtered α- and β-Ta coatings on AISI 4340 steel as a function of coating thickness

S. Maeng, L. Axe, T. A. Tyson, L. Gladczuk, M. Sosnowski

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40 Scopus citations

Abstract

The corrosion behaviour of magnetron sputtered α- and β-Ta coated AISI 4340 steels was studied with potentiodynamic polarization and electrochemical impedance spectroscopy. The coating porosity was observed to decrease with increasing coating thickness. For coatings less than 10 μm thick (α- or β-Ta), porosity was significant and open pores resulted in severe localized corrosion of the steel substrate, coating delamination, and overall coating failure. Additionally, the β-Ta coatings were more susceptible than the α-phase to delamination. As for the 50 and 100 μm thick α-Ta coatings, the electrochemical impedance behaviour was comparable to that of Ta foil, demonstrating the coating viability and corrosion resistance.

Original languageEnglish (US)
Pages (from-to)2154-2171
Number of pages18
JournalCorrosion Science
Volume48
Issue number8
DOIs
StatePublished - Aug 2006

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

Keywords

  • A. Tantalum
  • B. Magnetron sputtering
  • C. Coating thickness
  • C. Corrosion behaviour

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