“…This is actually the case concerning the participation of sulphate ions in the kinetics of the anodic dissolution and passivation of nickel in acid electrolytes. 67…”
Electrochemical data derived from different simple and complex potentiodynamic techniques for the Ni/0.5 N H~SO4 interface furnish a new insight about the activation and initial stage passivation of nickel. The anodic dissolution of nickel involves a metal surface which is either partially or completely covered by species such as NiOH, [NiOH.Ni(OH)2] or [Ni(OH)2.NiOOH]. The chemical dissolution of the various species in the acid electrolyte occurs at different rates. The relative dissolution rates can be estimated from the data derived from the complex triangular potential perturbations. The change of the Eli profile during cycling is explained through a complex reaction sequence which is in agreement with recently postulated reaction schemes and reported optical data.
“…This is actually the case concerning the participation of sulphate ions in the kinetics of the anodic dissolution and passivation of nickel in acid electrolytes. 67…”
Electrochemical data derived from different simple and complex potentiodynamic techniques for the Ni/0.5 N H~SO4 interface furnish a new insight about the activation and initial stage passivation of nickel. The anodic dissolution of nickel involves a metal surface which is either partially or completely covered by species such as NiOH, [NiOH.Ni(OH)2] or [Ni(OH)2.NiOOH]. The chemical dissolution of the various species in the acid electrolyte occurs at different rates. The relative dissolution rates can be estimated from the data derived from the complex triangular potential perturbations. The change of the Eli profile during cycling is explained through a complex reaction sequence which is in agreement with recently postulated reaction schemes and reported optical data.
“…There have been a number of studies indicating the direct participation of anions, particularly CI-, in the electrodissolution of iron (4)(5)(6)(14)(15)(16)(17)(18). Such anion effects on anodic nickel dissolution have also been reported (19)(20)(21)(22) but others, on the other hand, have observed no such effects (23,24).…”
Anodic nickel dissolution in acidic chloride solutions (constant ionic strengths of 1 and 5M) over a wide range of H + and Cl-concentrations has been investigated. Anodic dissolution in low [H+]-chloride solutions is accelerated by both C1-and OH-with Tafel slopes of about 2.303 RT/F. On
“…It is worth noting that the curve exhibits two anodic peaks, which have been previously described by Sury [25], Kesten and Feller [26], and Marshakov et al [27]. It is believed that the first peak is attributed to the primary passivation of Ni [25].…”
Section: Experimental and Discussionmentioning
confidence: 79%
“…(25) will be as follows: (26) Hence, using the equation to convert the energy of formation of surface oxide Me m O n to electrochemical energy, we obtain the formula for cal culating the Flade potential of pure metals in an aque ous solution:…”
Section: Passive State Of Nickel As An Electrochemical Equilibrium Atmentioning
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