Model of Dispersed Phase Particle Distribution in a Composite Electrolytic Coating
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TECHNICAL ARTICLE
Model of Dispersed Phase Particle Distribution in a Composite Electrolytic Coating V. V. Tytarenko1 · V. A. Zabludovsky1 · E. Ph. Shtapenko1 Received: 29 May 2020 / Revised: 3 September 2020 / Accepted: 9 September 2020 © ASM International 2020
Abstract A model is proposed to evaluate distribution of dispersed phase particles in a composite metal coating. This model is based on calculation of degree of surface occupation by particles and their distribution in volume. Effective parameters applied for electrolytic composites evaluation at the microscale level were formulated, and method for the parameters evaluation was set out. It was shown that density of distribution and portion of particles with certain size in a coating depend on electrodeposition modes. Generation of higher-fine crystalline close-packed structures of coatings in conditions of pulse relative duration increase from 2 to 50 and unchanged current frequency 50 Hz is caused by both increase of oversaturation at the crystallization front that results in higher non-equilibrium process of crystallization and also by passivation effect of UDD particles on the surface which is formed. Non-equilibrium conditions of crystallization give rise to more intensive penetration of disperse phase particles with smaller size (~ 0.25–1 μm) into growing coating, decrease of microlayers thickness from 4 to 2 μm and increase of UDD particles concentration from 1.43 to 2.47 mas.%. Keywords Composite electrolytic coating · Ultra-dispersed diamond particles · Degree of surface occupation · Density of distribution
Introduction Electrolytic coatings application represents one of the methods used for metalwork protection against corrosion and abrasion wear during the operation. One promising method of improvement of coatings performance properties involves composite electrolytic coatings (CEC) technology realized by co-deposition of metal substrate and reinforcing dispersed particles of the second phase. Growing interest to composite materials in these days is generated by opportunity for making materials which exhibit unique physicochemical properties [1–7]. By adding of detonation-synthesized nanodiamonds into aqueous nickel-plating and iron-plating electrolyte solution, the forming coatings receive 2–2.5 times increased microhardness, 3–6 times improved wear resistance, 3–4 times reduced porosity [1], and this addition provides significant effect on microstructure [2], tribological * V. V. Tytarenko [email protected]; [email protected] 1
Dnipro National University of Railway Transport named after Academician V. Lazaryan, Lazaryana St., 2, Dnipro 49010, Ukraine
properties [3–7] of composites and their corrosion resistance [5–8]. Particular attention is given to CEC comprising reinforcing particles relating to class of super-hard materials such as ultra-dispersed diamond (UDD) [6, 9]. Application of systems analysis to solving the task of improvement of CEC functional properties which lies in modification of metal matrix with UDD parti
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