Е-Публикации
Технически университет - София

Abstract: The present work is focused on a significant environmental problem related to the improvement of surface properties and corrosion resistance of technical titanium by “Inconel 718” alloy coatings. The environmentally friendly Bulgarian method of non-contact local electrospark deposition (LESD) was used, which implies the formation of coatings with low roughness and minimal defects. The relationship between the electrical parameters of the LESD modes and the topography, rough-ness, thickness, microhardness and corrosion characteristics of the coated surfaces was investigated using profilometric, metallographic and electrochemical methods. Dense and uniform coatings with an ultrafine structure and microhardness up to 12 GPa were created, whose roughness and thickness can be adjusted by the LESD modes in the range Ra = 1.5–4.5 µm, δ = 6–20 µm, respectively. The corrosion resistance of the coatings was determined by the potentiodynamic polarisation method and electrochemical impedance spectroscopy. The analysis of the obtained results clearly shows an improvement in corrosion resistance compared to the uncoated titanium substrate, since the corrosion rate, expressed in terms of corrosion current density, for some layers is up to 2 times smaller than that of titanium. Modification using LESD allows to increase the microhardness by 2.5 to 4 times that of the titanium substrate, delay corrosion and increase the life and reliability of the titanium surfaces. Appropriate energy parameters were determined to obtain coatings with predetermined thickness and roughness, increased hardness and corrosion resistance.

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