Institute of Materials Science of Khabarovsk Science Center of Far Eastern Branch of Russian Academy of Sciences, Khabarovsk, Russia:

S. V. Nikolenko, Leading Researcher
N. A. Syuy, Senior Engineer, e-mail: nicolaisyuy@gmail.com
A. A. Burkov, Researcher

This paper shows the results of investigation of TiC – Ni – Mo based electric discharge coatings with additions of datolite concentrate from 1 to 2%, deposited on steel 45 with pulse duration from 20 to 80 microseconds, repetition rate 400 Hz and single charge energy from 0.144 to 0.72 J. Introduction of datolite concentrate to 1–2% increases the percentage of liquid-phase component of erosion products in comparison with alloy TiC – Ni – Mo, and increases the quantity of spherical particles with growth of pulse duration from 20 to 80 microseconds. We investigated the kinetics of mass transfer with electric discharge deposition of coatings. Introduction of 1% (wt.) additive increases the efficiency of coatings formation process, in comparison with alloy TiC – Ni – Mo. Increasing of pulse duration from 20 to 80 microseconds increases the mass transfer and efficiency of electric discharge deposition. The most efficient modes of electric discharge alloying and composition of formed alloyed alloys were defined: frequency 400 Hz, duration 80 microseconds for electrode TiC – Ni – Mo with 1% of datolite concentrate. Phase composition, surface roughness and microabrasive wear were investigated. Increasing of additive of datolite concentrate in electrode material significantly decreases the parameters of coating surface roughness. Wear resistance of coatings, obtained during the electric discharge alloying of steel 45 by electrode materials based on the alloy TiC – Ni – Mo with datolite concentrate additives from 1 to 2%, exceeds the wear resistance of coatings obtained during the deposition by alloy TiC – Ni – Mo. Our investigations defined that microhardness of coatings is higher than steel 45 microhardness by 2–3 times. Impedance spectroscopy investigated the anti-corrosion properties of obtained coatings in 3% solution of NaCl. We show the improvement of barrier properties of TiC – Ni – Mo coatings with datolite concentrate growth.

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