Chemistry 2 (2015 8) 160-180 ~ ~ ~ УДК 546.30 Thermodynamic Evaluation of Electrochemical Stability of Me – Si Systems (Me = 4th Row Transition Metal) Pavel A. Nikolaychuk* Chelyabinsk State University 129 Bratyev Kashirinykh Str., Chelyabinsk, 454001, Russia Received 22.04.2015, received in revised form 16.05.2015, accepted 30.05.2015 This paper aims to review the studies of electrochemical properties of Me – Si binary systems for scandium, titanium, molybdenum, manganese, iron, cobalt, nickel, copper and zinc from the point of view of chemical thermodynamics. <...> The binary phase diagrams of Me – Si and Me – O systems were considered and thermodynamic properties of metals silicides and oxides at standard conditions were collected. <...> O systems at 25 ºC, air pressure of 1 bar and were plotted. <...> The corrosion-electrochemical behavior of Keywords: transition metals, silicides, oxides, chemical and electrochemical stability, potential – pH diagram, corrosion-electrochemical behavior. <...> All rights reserved * Corresponding author E-mail address: npa@csu.ru # 160 # Pavel A. Nikolaychuk. <...> In addition to other things, these compounds have high corrosion resistance; their thermodynamic and electrochemical properties are quite different. <...> However along with it, a theoretical studying of corrosion-electrochemical behaviour of these systems is also important because it allows complementing and extending experimental data. <...> The best carrier of thermodynamic information about possible chemical and electrochemical reactions proceeding in water environments is the diagram of electrochemical equilibrium (electrode potential vs. pH relationship), which allows one to clearly depict the domains of thermodynamic stability of all possible phases and determine the type of system corrosionelectrochemical behavior in certain environmental conditions. <...> The potential – pH diagrams for pure elements at 25 °C were introduced by М. <...> At the fi rst step one should study all phase and chemical equilibria in binary Me – Si system at 25 °C basing on its phase diagram, look for reference thermodynamic # 161 # Pavel A. Nikolaychuk. <...> Thermodynamic Evaluation of Electrochemical Stability of Me – Si Systems… data, check they are matched to each other and calculate thermodynamic properties of system components. <...> At the second step one should collect information about all possible oxides <...>