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Electrochemical behavior of nickel in HNO3 and the effect of chloride ions
Faculty
Science
Year:
2004
Type of Publication:
Article
Pages:
784-792
Authors:
Abd El Haleem, SM, Abd El Aal, EE
DOI:
10.1361/10599490421538
Journal:
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE ASM INTERNATIONAL
Volume:
13
Research Area:
Materials Science
ISSN
ISI:000225920200019
Keywords :
behavior, chloride ions, cyclic voltammograms, nickel, nitric acid, passivation
Abstract:
The electrochemical behavior of nickel in HNO3 solutions of varying concentrations was examined using the cyclic voltammetry and potentiodynamic anodic polarization techniques. The anodic branch of the cyclic voltammogram is characterized by one anodic dissolution peak and a passivation region before oxygen evolution. The cathodic branch shows only one cathodic reduction peak corresponding to the reduction of HNO3. Analysis of the anodic polarization data shows features of both reversible and irreversible reactions pointing to the complexity of the system. Cl- ions enhance the active dissolution of nickel in HNO3 due to the adsorption on the bare metal surface and cause destruction of the passive film and initiation of pitting corrosion.
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