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Anodic dissolution of nickel in acidic chloride solutions
Faculty
Science
Year:
2003
Type of Publication:
Article
Pages:
172-178
Authors:
DIAB, A, El Aal, EEA, Zakria, W, El Haleem, SMA
Journal:
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE ASM INTERNATIONAL
Volume:
12
Research Area:
Materials Science
ISSN
ISI:000182327400009
Keywords :
anodic dissolution, galvanostatic, hydrochloric acid and inhibitors, nickel, polarization
Abstract:
The anodic dissolution of nickel was studied galvanostatically in hydrochloric acid solutions of various concentrations. The reaction orders of chloride ion and hydrogen ion concentrations were found to be 0.5 and 1.0, respectively. An anodic Tafel slope equal to 120 +/- 10 mV (.) decade' was obtained. The dissolution rate of nickel at constant acid concentration was increased with stirring of the solution and increasing temperature. The activation energy, OH, for the anodic dissolution process was found to be 12 kcal (.) mol(-1). The presence of oxygen in solutions assisted the passivation process. The effect of addition of aniline and some of its derivatives (o-, m-, and p-anisidine) as inhibitors on the dissolution kinetics of Ni in 1 M HCl was also investigated. These compounds inhibited the anodic dissolution of nickel without affecting the Tafel slope, indicating that the adsorption of such inhibitors could not interfere with the mechanism of metal dissolution.
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