Abstract

Bekenova Gulmira¹, Baeshov Abduali, Yılmaz Satılmış

 

DOI : http://dx.doi.org/10.13005/ojc/310115

In the presented work in order to deeply study the mechanism of electrode processes that take place while polarizing the nickel electrode in acid solutions by alternating current, potentiodynamic polarization curves were obtained.The detailed study of shapes of polarization curves; their dependence on concentration, temperature, and other physical and chemical parameters, gives opportunity to obtain full information on the nature and kinesthetic of processes taking place on electrode surface. The electrochemical properties of nickel electrode were researched by estimating cyclic potentiodynamic polarization curves in sulfuric acid medium; and the influence of electrolyte concentration, potential giving speed, the temperature of solution on anodic and cathode processes were also studied. The meanings of transfer number (a_n)   and diffusion (D) coefficient, the reaction order of metal ions during the process of nickel electrode’s anode corrosion in sulfuric acid solution, and the activation energy is estimated. Result of the calculations showed that nickel’s melting process goes in mixed, diffusion-kinetic regime.  It was found that the raising of solution’s temperature increases the height of corrosion current. The results of the experiments done during the application of cyclic polarization curves showed that the electrochemical processes that take place in polarization by industrial alternating current in anode and cathode half periods is different from those done in stable current and with more complex mechanism.

Nickel electrode; Potentiodynamic polarization curves; Alternating current; Electrodeposition

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