Behaviour of Nickel Amalgams in Phosphoric Acid Solutions
| Main Authors: | R. ABOU SHAHBA, N. S. HASSAN, A. S. AHMED, S. M. ROSHDY |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1990
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6220622 |
Daftar Isi:
- Al-Azhar University, Faculty of Science (for Girls), Chemistry Department, Nasr City, Cairo, Egypt Manuscript received 26 September 1988, revised 8 February 1990, accepted 7 May 1990 Nickel amalgams of varying concentrations were anodically oxidised galvanostatically in phosphoric acid solutions at 25°. For nickel amalgams two different oxidation patterns were distinguished- the first in concentrated (1.0 and 3.0 N H3PO4) and the second in dilute (0.1 N H3PO4) acid solutions. The relation between the polarising current (i) and the time of passivation (t) was found to follow the relation, log \(\mathfrak{t}\)= A -n log i, where A and n are constants. The diffusion of nickel within the amalgam to the amalgam/electrolyte interface was mainly rate-determining in the process of passivation. The effect of temperature on the time of passivation of nickel amalgams in phosphoric acid solution was also investigated.