Periodic Phenomena at a Nickel Electrode in Sulfuric Acid

Abstract

not Available.

Temporal Instabilities in Corrosion Processes

“…This process has been quite intensively studied, starting from Hoar and Mowat in 1950 [87], through papers by Osterwald from 1960 and 1962 [88,89], up to more recent studies, published by Lev et al in 1988 and1989 [90-92].…”

“…The advantage of such experimental methodology will be explained in view of Fig. 6.37, which shows the polarization curve recorded by Osterwald and Feller [88] under potentiostatic conditions [90].…”

“…Then the system's control was switched to galvanostatic, with the galvanostat set previously at a value of current identical with that measured in the potentiostatic mode. Depending on the choice of the potential, three major dynamical behaviors were observed by Osterwald [88]:…”

Study of the forced Ni|1 M H2SO4 oscillator

“…Spontaneous current or electrode potential oscillations often observed when studying dissolution-passivation of metals such as Fe [2,3] or electropolishing of metals such as Cu [4] have been well documented [5]. Potential oscillations under galvanostatic conditions have also been studied, for example for the oxidation of formaldehyde [6,7] on Pt electrodes, the reduction of H 2 O 2 on Pt [8] and GaAs [9] and the oxidation of Ni in H 2 SO 4 solutions [10,11]. More recently emerging coherence in a population of self-oscillating Ni electrodes has been reported [12].…”

“…Anodic dissolution-passivation of Ni has been widely studied [24][25][26] and potential oscillations of the NijH 2 SO 4 system under galvanostatic conditions have been known for a long time [10,11]. They are of a different type.…”