The Pitting Corrosion of Nickel in Different Electrolyte Solutions Containing Chloride Ions

Abstract

The pitting corrosion of nickel in different electrolytes containing chloride ions was studied by using potentiostatic and potentiodynamic techniques complemented with scanning electron microscopy. The breakdown potential depends linearly on the logarithm of the chloride ion concentration. The logarithm of the induction time for pit initiation decreases linearly with the reciprocal of the applied potential. The overall process can be described by two stages. The first stage of pitting is explained through the formation of the passive layer in competition with the nucleation and growth of a chloride layer. The second stage, which is diffusion controlled, occurs when the salt precipitation conditions is reached. The proposed reaction model reproduces the potentiostatic current transients of nickel pitting by chloride in near-neutral buffered and alkaline solutions.

The electrochemical behaviour of polycrystalline nickel electrodes in different carbonate-bicarbonate ion-containing solutions

“…The kinetic laws related to passive layer formation in the absence of CI ions probably involve a nucleation and growth mechanism under diffusion control. It should be noted that the type of behaviour just described is qualitatively comparable to that already reported for the pitting corrosion of nickel in near neutral buffered solutions containing 0.1-1 M NaC1 [38]. In addition, it also correlates with the time variation of the amount of electric charge passed in film formation on nickel at pH 8.42 and pH 11.5 at constant potential, E = 0.645 V, in borate and phosphate solutions containing 0.5 M NaC1 [39], which exhibits an inflexion between two stages of the process.…”

Electroless deposition of nickel-boron coatings using low frequency ultrasonic agitation: Effect of ultrasonic frequency on the coatings

“…This fact may also explain the variations in the hydrogen evolution potential observed for the different systems. The passive film of nickel is susceptible to pitting corrosion in the presence of chlorides [58]. Furthermore, in the present case, the deposition of Ni atoms leads to the generation of a considerable amount of boundaries (especially in the absence of US).…”

Polymer based electricity generation inspired by eel electrocytes

“…However, the pits that cause pitting corrosion are not as intense as in aluminum (Figure S3b). The resistivity of nickel alloys against the pitting corrosion created by chloride‐containing ambient is usually high, but they may be vulnerable to crevice corrosion 33,34 . Based on these results, it can be deduced that another voltage contribution comes from the interaction between polymer gels and CCs.…”

“…The resistivity of nickel alloys against the pitting corrosion created by chloride-containing ambient is usually high, but they may be vulnerable to crevice corrosion. 33,34 Based on these results, it can be deduced that another voltage contribution comes from the interaction between polymer gels and CCs. Because the free ions derived from the corroded or oxidized metals could contribute to the charge transport inside the ionic conducting polymer, it would result in voltage output.…”