Abstract
Electrochemical composite coatings allow successfully solving many practical problems of surface-hardening of structural parts and their tooling components, as well as renewing their fast-wearing components. Electrochemical chromium-matrix composite coatings are used to enhance the thermal and wear resistance of steel articles and parts operating in friction conditions and under increased temperatures, but under low shock loads. This paper presents the results obtained from studying how fine black carbon particles affect the properties of composite coatings. Optimal conditions are found for producing high-quality coatings, such as the suspended electrolyte mixing rate and graphite concentration in electrolyte. We have also studied how heat treatment affects the microhardness and surface morphology of coatings. High-dispersed black graphite can be used to produce chromium-matrix composite coatings having increased microhardness and wear resistance.
Highlights
Current technology is in desperate need for materialsthat can withstand continuous mechanical and thermal loadsand efficiently offset the impacts of wear, aggressive media, and loads.Currently, a great attention is given to composites and composite coatings
One of the ways to produce composite coatings is electroplating, i.e., depositing the electrochemical composite coatings (ECC) from suspended electrolytes byrefilling the galvanic deposit of particles and microfibers dispersed in the electrolyte [1]
* Corresponding author: vod-sveta@yandex.ru https://doi.org/10.10 51/matecconf /202134602030 is the characteristic of dispersed phase (DPh) particles, i.e., their nature, concentration, dispersiveness, electric conductivity, density, dissolubility, and wettability [2]
Summary
Current technology is in desperate need for materialsthat can withstand continuous mechanical and thermal loadsand efficiently offset the impacts of wear, aggressive media, and loads. Many mechanical engineering parts and products, in which electrochemical chromium coatings are used, are operated at increased temperatures and in the conditions of cyclic heat loads. Both in Russia and abroad, active studies are performed regarding composite coatings modified nanosized particles of different nature. We have studied the structural state, microhardness, and thermal stability of chromium coatings modified by the nanosized additives of carbon-containing particles of different types in the conditions of cyclic heat loads and annealing within the temperature range of 770-870 K. The study was aimed at investigating how high-dispersion black carbon particles can affect the properties of Cr-ECC
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