There has been a growing interest in the use of high velocity oxy-fuel (HVOF) thermal spraying to deposit protective coatings onto the surfaces of engineering components to allow them to function under extreme conditions. To date a number of studies have examined the influence of HVOGF process parameters on the microstructure and corrosion resistance of sprayed metallic coatings. However, much less is known about microstructure and corrosion resistance of HVOLF sprayed metallic coatings and particularly their behaviour in comparison with HVOGF deposits. Therefore the aim of this paper is to investigate the corrosion behaviour of two metallic alloys sprayed by both the HVOGF and HVOLF processes. Coating microstructures are described and the corrosion behaviour is compared with that of wrought Inconel 625, cast Stellite 6 and weld overlay Stellite 6. Paper includes a German-language abstract.

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