Muralidharan, V.S. and Veerashanmugamani, M. and Paruthimalkalaignan, G. and Arulraj, I. (1985) Mechanism of corrosion of pure nickel in sulphuric acid solutions. Bulletin of Electrochemistry , 1 (3). pp. 241-244. ISSN 0256-1654

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The anodic behaviour of nickel in acid baths in plating, electrowinning and pickling processes is of industrial concern. Potentiostatic measurements were carried out to find corrosion rates in different concentrations of sulphuric acid solutions. To understand the dependence , o, E, f and I, on solution parameters, a detailed investigation on nickel dissolutjon and hydrogen evolution has been carried out. In the mechanism of nickel dissolution, the number of electrons transferred has been identified from the equilibrium potential us concentration of ~ip"lo ts. The anodic and cathodic Tafel slopes, anodic and cathodic reaction orders with respect to ~iio~ns, 'su lphate ions and pH revealed that the ratedetermining step for dissolution is NiOH,,,, . -. NiOH' + e. The variation of cathodic current densities with the concentration of H' ions, or sulphate ions, and the value of 135 f 15 mV/ decade for Tafel slope suggest the rate determining step as H'+e -. H. The rate of sulphate ions on enhancing the exchange current density of the hydrogen evolution reaction has been pointed out

Item Type: Article
Subjects: Corrosion Science and Engineering
Depositing User: ttbdu cecri
Date Deposited: 20 Mar 2012 18:11
Last Modified: 20 Mar 2012 18:11

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