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| Abstract No.: |
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| Title: |
Assessment of the adhesion, wear and corrosion behavior of thermally sprayed NiCrBSi, Cr3C2-NiCr and Nb2O5 coatings
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| Authors: |
Carlos Roberto Camello Lima* / Mackenzie Presbyterian University, Brazil
Maria Julia Xavier Belém / Methodist University of Piracicaba, Brazil
Rodolfo Libardi/ Methodist University of Piracicaba, Brazil
Flávio Camargo/ Ogramac Surface Engineering,
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| Abstract: |
Several industrial components like riser pins used in the gas & oil industry are subjected to wear and corrosion. Thermally sprayed coatings have been used to protect such components with satisfactory results. This paper evaluates the adhesion, wear and corrosion resistance of three thermally sprayed coating materials deposited by flame or HVOF spraying for tribological applications. The microhardness and microstructure of the coatings were also analyzed. The erosive and abrasive wear resistance of the coatings was determinate by slurry erosion and rubber wheel abrasive wear tests (ASTM G65), respectively. The adhesion tests were performed according to ASTM-C633-01 standard. Corrosion resistance of the coatings and degradation behavior were investigated by electrochemical impedance spectroscopy. Scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS) allowed supplementing the evaluation of the coatings. The comparative performance of the coatings is discussed as well as the relationship between the mechanical and tribological characteristics.
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