Abstract
The present work aims to characterized nickel phosphorus coatings co-deposited with talc particles on steel. The NiP-talc composite deposits were developed to serve as hard coatings with a lubricating effect at 600 °C. This process, which is free of hexavalent chromium, could provide a reliable substitute for the electrodeposition of hard chromium coating used in industrial applications. Local responses to static and dynamic mechanical loading have been obtained by nano- and microhardness, microtensile and nanoscratch testing. The hardness and stiffness values slightly decrease when the amount of talc increases for untreated coatings. In contrast, a 420 °C heat treatment leads to high hardness and Young's modulus values due to crystallization. Moreover, a 600 °C heat treatment lowers these values through overageing. A 420 °C heat treatment greatly improves the adherence and the cohesion of the coatings containing talc.
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