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Title of Journal: Bull Mater Sci

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Abbravation: Bulletin of Materials Science

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Indian Academy of Sciences

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DOI

10.1016/0891-3919(57)90218-8

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0973-7669

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Effect of nickel content on the anodic dissolution

Authors: ABDELRAHMAN ELSAYED HANY M ABD ELLATEEF HOSSNIA S MOHRAN
Publish Date: 2015/04/18
Volume: 38, Issue: 2, Pages: 379-391
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Abstract

The effect of systematic increase of Ni on the anodic dissolution and passivation of Zn–Ni alloys in various concentrations of KOH solution 01–1 M was investigated The anodic dissolution and passivation behaviour for each pure Zn and Ni in the same studied solutions was also investigated and the obtained data were compared Potentiodynamic and potentiostatic methods were used and the corrosion layer formed on each electrode surface was characterized by Xray diffraction XRD and scanning electron microscope SEM The results of the anodic potentiodynamic measurements exhibited that the polarization curves showed active/passive transition in the case of Ni and active/pseudopassive in the case of both Zn and its alloys The results showed that the increase in Ni content increases the activation energy E a and decreases the dissolution rate of the alloys in KOH solution and the lowest dissolution rate was obtained at 10 Ni The results of both potentiodynamic and potentiostatic measurements exhibit sudden increase in current density which is observed at certain positive potential + 042 V vs SCE in the case of the investigated alloys This indicates that the addition of Ni to Zn promotes the electrochemical reaction in the passive region However the passivation potential shifted to more positive direction with the increase in Ni content in the alloy

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