The localized acidification mechanism for stable pitting growth was the result of the pitting research performed by many investigators, led by Dr. J.R. Galvele. The key point of the mechanism is that there is a pH drop on the anode surface, and that this pH drop is a necessary condition to sustain pitting.The analysis of the transport processes taking place inside a pit, taking into account the hydrolysis of the metal ions, allowed to explain the pitting potential significance and give a quantitative explanation of the influence of solution pH, reducible ions, inhibitors and aggressive ion concentration on the pitting potential. In the present work a brief description of the mechanism development and examples of the pitting and crevice systems that have confirmed its validity are going to be presented. Potential future lines of work, are also briefly suggested.

Subject
Pits, Repassivation potentials, Iron, Acidification, Acidity, Sodium chloride solution, Ion concentrations, Metals, Electric potential, Pitting, Hydrolysis, Corrosion potential, Electrode potential
Keywords:
pitting, mechanism, acidification
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2016
Association for Materials Protection and Performance (AMPP)
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