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Open AccessArticle

Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

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Department of Mechanical Industrial and Aerospace Engineering, Concordia University, Montreal, QC H3G 2W1, Canada
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Institut de Recherche d’Hydro Québec, Varennes, QC J3X 1S1, Canada
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Department of Chemistry, Laboratory for Electrochemical Reactive Imaging and Detection of Biological Systems, McGill University, Montreal, QC H3A 0B8, Canada
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(12), 835; https://doi.org/10.3390/coatings9120835
Received: 2 November 2019 / Revised: 29 November 2019 / Accepted: 4 December 2019 / Published: 7 December 2019
(This article belongs to the Section Corrosion, Wear and Erosion)
Thermally sprayed stainless-steel coatings were produced with a wide range of deposition parameters. The electrochemical behavior of polished coatings was monitored for 3 weeks in 3.5 wt.% NaCl aqueous solution and compared to that of reference materials including a wrought stainless steel plate and a bulk ingot produced by arc melting of the spraying powder feedstock. Transitions in the polarization behavior are discussed based on the observed changes in coating microstructures as well as on the shifts in X-ray photoelectron spectra (XPS). Results show that the deposition parameters have a strong effect on the coating microstructures but the small differences in the polarization behavior of coatings mostly disappear after 1 week of testing. Microstructure evidence shows preferential corrosion at splats experiencing melting prior to deposition. Pitting and corrosion products between splat boundaries are also reported. XPS analysis shows that the coating surfaces are enriched in chromium oxides and hydroxides. Comparison between the coating and bulk stainless steels suggests that coating inherent defects play a major role on their impaired corrosion resistance. View Full-Text
Keywords: thermal spray; ferritic stainless steels; corrosion resistance thermal spray; ferritic stainless steels; corrosion resistance
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Nascimento, A.R.C.; Gateman, S.M.; Mauzeroll, J.; Savoie, S.; Schulz, R.; Moreau, C. Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings. Coatings 2019, 9, 835.

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