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Wear and Corrosion Resistance of High-Velocity Oxygen-Fuel Sprayed Iron-Based Composite Coatings



OtsikkoSurface Modification Technologies XXVIII
AlaotsikkoProceedings of the Twenty Eighth International Conference on Surface Modification Technologies
ToimittajatT.S Sudarshan, Petri Vuoristo, Heli Koivuluoto
ISBN (painettu)978-81-926196-1-3
TilaJulkaistu - tammikuuta 2015
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaInternational Conference on Surface Modification Technologies - , Suomi
Kesto: 1 tammikuuta 2000 → …


ConferenceInternational Conference on Surface Modification Technologies
Ajanjakso1/01/00 → …


Thermally sprayed iron-based coatings are being widely studied as alternative solution to conventional hardmetal (cermet) and Ni-based coatings for wear and corrosion applications in order to reduce costs, limit environmental impact
and enhance the health safety. The aim of the present work is to study the cavitation erosion behaviour in distilled water and the corrosion properties in acidic solution of four high-velocity oxy-fuel (HVOF) sprayed Fe-based composite coatings. Fe-Cr-Ni-B-C powder was selected for its good sliding wear properties. In addition, a powder composition with an addition of Mo was
studied in order to increase the corrosion resistance whereas additions of 20 wt. % and 40 wt. % WC-12Co as blended powder mixtures were investigated in order to increase wear resistance. Improvement of coating properties was significant with the advanced powder compositions. Dense coating structures with low porosity were detected with microstructural characterization. In addition, good cavitation wear resistance was achieved. The cavitation resistance of customized Fe-based coating with Mo addition was reported to be 0.41 h/μm nearly twice as high as that of conventional Ni-based and WC-CoCr coatings. The corrosion properties of HVOF Fe-based coatings were also evaluated by studying electrochemical behaviour in order to analyse their potential to use as corrosion barrier coatings. Customized Fe-based coating with Mo addition improved the corrosion behaviour by noticeably reducing corrosion current (C102: 4.06∙10-4 vs. C102(Mo): 1.35∙10-4 A/cm2)and by
showing a large potential range of passivation behaviour.


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