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Improving the strength and corrosion resistance of 316L stainless steel for biomedical applications using cold spray

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.surfcoat.2012.11.061
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Affiliation
  1. National Research Council of Canada. NRC Industrial Materials Institute
FormatText, Article
Subject316 L stainless steel; analysis and characterization; biomedical applications; coating parameters; cobalt-chromium alloys; cold gas dynamic spray; cold spray; corrosion behavior; electron back scatter diffraction; Hank's solution; mild steel substrates; potentiodynamic polarization tests; room temperature; stainless steel 316L; stent; tensile tests; thinner coatings; carbon steel; chromium; chromium alloys; coatings; cobalt; diffusion; ductility; medical applications; scanning electron microscopy; stainless steel; tensile testing; corrosion resistance
Abstract
Stainless steel 316L mixed with cobalt chromium alloy L605 powders has been cold sprayed onto mild steel substrate. As spraying Co-Cr alone is difficult, three different proportions (by volume of Co-Cr, 25%, 33.3% and 50%) were used in this study. Analysis and characterization of sprayed depositions were performed through scanning electron microscopy, electron backscatter diffraction, microhardness, and tensile tests at room temperature. The porosity of the coating was low for both the 25% and 33.3% coating (about 0.9-1.5%). However, the 50% coating had a much poorer deposition rate leading to a much thinner coating using the same coating parameters; the porosity was much higher (about 4.5%). The ductility of the annealed 25% and 33.3% specimens reached approximately 20% and 18% respectively after annealing, but the 50% specimen was too thin to be tested. The corrosion behavior was evaluated using potentiodynamic polarization tests carried at Hank's solution as an electrolyte. It was found that corrosion resistances of the metal-metal mixture were higher than that of pure stainless steel. © 2012 Elsevier B.V.
Publication date
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  • Surface & Coatings Technology 216: 297–307.
LanguageEnglish
Peer reviewedYes
NPARC number21269968
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Record identifier6740a912-293d-41d0-a6d4-e8006952f843
Record created2013-12-13
Record modified2020-04-22
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