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

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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.

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