Corrosion Properties of Cold-Sprayed Tantalum Coatings View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-03

AUTHORS

Heli Koivuluoto, Jonne Näkki, Petri Vuoristo

ABSTRACT

Cold spraying enables the production of pure and dense metallic coatings. Denseness (impermeability) plays an important role in the corrosion resistance of coatings, and good corrosion resistance is based on the formation of a protective oxide layer in case of passivating metals and metal alloys. The aim of this study was to investigate the microstructural details, denseness, and corrosion resistance of two cold-sprayed tantalum coatings with a scanning electron microscope and corrosion tests. Polarization measurements were taken to gain information on the corrosion properties of the coatings in 3.5 wt.% NaCl and 40 wt.% H2SO4 solutions at room temperature and temperature of 80 °C. Standard and improved tantalum powders were tested with different spraying conditions. The cold-sprayed tantalum coating prepared from improved tantalum powder with advanced cold spray system showed excellent corrosion resistance: in microstructural analysis, it showed a uniformly dense microstructure, and, in addition, performed well in all corrosion tests. More... »

PAGES

75-82

References to SciGraph publications

  • 1996-12. Densification of plasma-sprayed titanium and tantalum coatings in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 2006-12. New developments in cold spray based on higher gas and particle temperatures in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 2006-06. Air gas dynamic spraying of powder mixtures: Theory and application in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 2002-12. An analysis of the cold spray process and its coatings in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 2007-12. Microstructural Studies of Cold Sprayed Copper, Nickel, and Nickel-30% Copper Coatings in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 2004-06. Analysis of tantalum coatings produced by the kinetic spray process in JOURNAL OF THERMAL SPRAY TECHNOLOGY
  • 1998-06. Gas dynamic principles of cold spray in JOURNAL OF THERMAL SPRAY TECHNOLOGY
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    http://scigraph.springernature.com/pub.10.1007/s11666-008-9281-2

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    http://dx.doi.org/10.1007/s11666-008-9281-2

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